/* roulang page: index */
/* ===== CSS Design Variables ===== */
:root {
  --color-primary: #0a1628;
  --color-primary-light: #132240;
  --color-primary-dark: #060f1a;
  --color-accent: #d4a345;
  --color-accent-hover: #c4932e;
  --color-accent-light: #f0d48a;
  --color-orange: #e67e22;
  --color-orange-hover: #d35400;
  --color-bg: #f5f7fa;
  --color-bg-dark: #eef1f5;
  --color-white: #ffffff;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-text-lighter: #94a3b8;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  --sidebar-width: 240px;
  --sidebar-collapsed: 64px;
  --header-height: 64px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.10), 0 4px 16px rgba(0,0,0,0.06);
  --shadow-xl: 0 24px 60px rgba(0,0,0,0.14);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
  --max-width: 1200px;
  --gap: 24px;
  --gap-lg: 40px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--color-accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent-hover); }
a:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; border-radius: 2px; }
img { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; font-family: inherit; font-size: inherit; border: none; background: none; }
input, textarea, select { font-family: inherit; font-size: inherit; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--color-primary); }
h1 { font-size: 2.75rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.375rem; }
h4 { font-size: 1.125rem; }
p { margin-bottom: 1rem; color: var(--color-text-light); }
p:last-child { margin-bottom: 0; }
::selection { background: var(--color-accent); color: var(--color-white); }
::-moz-selection { background: var(--color-accent); color: var(--color-white); }

/* ===== Container ===== */
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 var(--gap); }

/* ===== Layout: App Shell ===== */
.app-shell { display: flex; min-height: 100vh; }

/* ===== Sidebar ===== */
.sidebar {
  position: fixed; top: 0; left: 0; bottom: 0; z-index: 1000;
  width: var(--sidebar-width); background: var(--color-primary);
  display: flex; flex-direction: column; transition: transform var(--transition);
  box-shadow: 4px 0 24px rgba(0,0,0,0.10);
  overflow-y: auto; overflow-x: hidden;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 4px; }

.sidebar-logo {
  display: flex; align-items: center; gap: 12px;
  padding: 20px 20px 16px; border-bottom: 1px solid rgba(255,255,255,0.06);
  flex-shrink: 0;
}
.sidebar-logo .logo-icon {
  width: 40px; height: 40px; border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--color-accent), var(--color-orange));
  display: flex; align-items: center; justify-content: center;
  font-size: 20px; color: var(--color-primary); font-weight: 800;
  flex-shrink: 0;
}
.sidebar-logo .logo-text {
  font-size: 1.05rem; font-weight: 700; color: var(--color-white);
  line-height: 1.3; letter-spacing: 0.3px;
}
.sidebar-logo .logo-text span { color: var(--color-accent); }

.sidebar-nav { flex: 1; padding: 12px 12px; }
.sidebar-nav .nav-label {
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 1.2px;
  color: rgba(255,255,255,0.3); padding: 16px 12px 8px; font-weight: 600;
}
.sidebar-nav .nav-item {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 14px; border-radius: var(--radius-sm);
  color: rgba(255,255,255,0.65); font-size: 0.92rem; font-weight: 500;
  transition: all var(--transition); cursor: pointer;
  position: relative; margin-bottom: 2px;
}
.sidebar-nav .nav-item i { width: 20px; text-align: center; font-size: 1rem; color: rgba(255,255,255,0.4); transition: color var(--transition); }
.sidebar-nav .nav-item:hover { background: rgba(255,255,255,0.06); color: var(--color-white); }
.sidebar-nav .nav-item:hover i { color: var(--color-accent); }
.sidebar-nav .nav-item.active {
  background: rgba(212,163,69,0.15); color: var(--color-accent); font-weight: 600;
}
.sidebar-nav .nav-item.active::before {
  content: ''; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
  width: 3px; height: 24px; background: var(--color-accent);
  border-radius: 0 4px 4px 0;
}
.sidebar-nav .nav-item.active i { color: var(--color-accent); }
.sidebar-nav .nav-item .badge {
  margin-left: auto; background: var(--color-accent); color: var(--color-primary);
  font-size: 0.65rem; font-weight: 700; padding: 2px 8px; border-radius: 20px;
  line-height: 1.4;
}

.sidebar-footer {
  padding: 16px 20px; border-top: 1px solid rgba(255,255,255,0.06);
  flex-shrink: 0;
}
.sidebar-footer .sidebar-contact {
  display: flex; align-items: center; gap: 10px;
  color: rgba(255,255,255,0.4); font-size: 0.8rem;
}
.sidebar-footer .sidebar-contact i { font-size: 0.85rem; }

/* ===== Main Content ===== */
.main-content {
  margin-left: var(--sidebar-width); flex: 1; min-height: 100vh;
  display: flex; flex-direction: column;
}

/* ===== Mobile Top Bar ===== */
.mobile-topbar {
  display: none; position: sticky; top: 0; z-index: 999;
  background: var(--color-primary); padding: 0 var(--gap);
  height: var(--header-height); align-items: center; gap: 12px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.10);
}
.mobile-topbar .hamburger {
  width: 40px; height: 40px; display: flex; align-items: center; justify-content: center;
  color: var(--color-white); font-size: 1.25rem; border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.mobile-topbar .hamburger:hover { background: rgba(255,255,255,0.08); }
.mobile-topbar .mobile-logo { color: var(--color-white); font-weight: 700; font-size: 1rem; }
.mobile-topbar .mobile-logo span { color: var(--color-accent); }
.mobile-topbar .mobile-actions { margin-left: auto; display: flex; gap: 6px; }
.mobile-topbar .mobile-actions a {
  width: 40px; height: 40px; display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,0.7); border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.mobile-topbar .mobile-actions a:hover { background: rgba(255,255,255,0.08); color: var(--color-white); }

/* ===== Overlay ===== */
.sidebar-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0; z-index: 999;
  background: rgba(0,0,0,0.5); backdrop-filter: blur(4px);
  display: none; animation: fadeIn 0.2s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* ===== Hero Section ===== */
.hero {
  position: relative; padding: 80px 0 80px; overflow: hidden;
  background: var(--color-primary);
  min-height: 520px; display: flex; align-items: center;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  background-image: url('/assets/images/backpic/back-1.png');
  background-size: cover; background-position: center center;
  opacity: 0.25; filter: saturate(1.1);
}
.hero-bg::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(10,22,40,0.92) 0%, rgba(10,22,40,0.70) 50%, rgba(10,22,40,0.40) 100%);
}
.hero .container { position: relative; z-index: 2; }
.hero-content { max-width: 680px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(212,163,69,0.15); border: 1px solid rgba(212,163,69,0.25);
  padding: 6px 16px; border-radius: 40px; font-size: 0.82rem; font-weight: 600;
  color: var(--color-accent); margin-bottom: 20px; letter-spacing: 0.5px;
}
.hero-badge i { font-size: 0.75rem; }
.hero h1 {
  font-size: 3.2rem; font-weight: 800; color: var(--color-white);
  line-height: 1.15; margin-bottom: 16px; letter-spacing: -0.5px;
}
.hero h1 .highlight { color: var(--color-accent); }
.hero p {
  font-size: 1.15rem; color: rgba(255,255,255,0.7);
  margin-bottom: 32px; max-width: 560px; line-height: 1.7;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border-radius: var(--radius-sm); font-weight: 600;
  font-size: 0.95rem; transition: all var(--transition); line-height: 1.4;
  border: 2px solid transparent; cursor: pointer;
}
.btn-primary {
  background: var(--color-accent); color: var(--color-primary);
  border-color: var(--color-accent);
}
.btn-primary:hover { background: var(--color-accent-hover); border-color: var(--color-accent-hover); color: var(--color-primary); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(212,163,69,0.30); }
.btn-primary:active { transform: translateY(0); }
.btn-outline {
  background: transparent; color: var(--color-white);
  border-color: rgba(255,255,255,0.25);
}
.btn-outline:hover { background: rgba(255,255,255,0.08); border-color: rgba(255,255,255,0.5); color: var(--color-white); transform: translateY(-2px); }
.btn-outline:active { transform: translateY(0); }
.btn-lg { padding: 14px 36px; font-size: 1.05rem; }
.hero-stats {
  display: flex; gap: 40px; margin-top: 40px; padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.hero-stat-item { text-align: left; }
.hero-stat-item .num { font-size: 1.75rem; font-weight: 800; color: var(--color-white); line-height: 1.2; }
.hero-stat-item .num span { color: var(--color-accent); }
.hero-stat-item .label { font-size: 0.8rem; color: rgba(255,255,255,0.5); margin-top: 4px; }

/* ===== Section General ===== */
.section { padding: 72px 0; }
.section-dark { background: var(--color-primary); }
.section-dark h2, .section-dark .section-title { color: var(--color-white); }
.section-dark .section-subtitle { color: rgba(255,255,255,0.6); }
.section-light { background: var(--color-white); }
.section-muted { background: var(--color-bg); }
.section-header { text-align: center; margin-bottom: 48px; }
.section-header-left { text-align: left; }
.section-title {
  font-size: 2rem; font-weight: 800; margin-bottom: 12px;
  letter-spacing: -0.3px;
}
.section-title .highlight { color: var(--color-accent); }
.section-subtitle {
  font-size: 1.05rem; color: var(--color-text-light);
  max-width: 640px; margin: 0 auto; line-height: 1.7;
}
.section-header-left .section-subtitle { margin: 0; }

/* ===== Features / Cards Grid ===== */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--gap); }
.feature-card {
  background: var(--color-white); border-radius: var(--radius-md);
  padding: 36px 28px; box-shadow: var(--shadow-sm);
  transition: all var(--transition); border: 1px solid var(--color-border-light);
  position: relative; overflow: hidden;
}
.feature-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-orange));
  opacity: 0; transition: opacity var(--transition);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }
.feature-card:hover::before { opacity: 1; }
.feature-card .icon-box {
  width: 52px; height: 52px; border-radius: var(--radius-sm);
  background: linear-gradient(135deg, rgba(212,163,69,0.12), rgba(212,163,69,0.04));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.35rem; color: var(--color-accent); margin-bottom: 18px;
}
.feature-card h3 { font-size: 1.15rem; margin-bottom: 8px; color: var(--color-primary); }
.feature-card p { font-size: 0.9rem; color: var(--color-text-light); line-height: 1.7; }

/* ===== Category Cards ===== */
.categories-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--gap); }
.category-card {
  background: var(--color-white); border-radius: var(--radius-md);
  overflow: hidden; box-shadow: var(--shadow-sm);
  transition: all var(--transition); border: 1px solid var(--color-border-light);
  display: flex; flex-direction: column;
}
.category-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }
.category-card .card-img {
  height: 180px; overflow: hidden; position: relative;
}
.category-card .card-img img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform var(--transition);
}
.category-card:hover .card-img img { transform: scale(1.05); }
.category-card .card-img .card-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(0deg, rgba(10,22,40,0.30) 0%, transparent 60%);
}
.category-card .card-body { padding: 22px 24px 24px; flex: 1; display: flex; flex-direction: column; }
.category-card .card-tag {
  display: inline-block; font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.8px; color: var(--color-accent); margin-bottom: 6px;
}
.category-card h3 { font-size: 1.15rem; margin-bottom: 8px; color: var(--color-primary); }
.category-card p { font-size: 0.88rem; color: var(--color-text-light); line-height: 1.7; flex: 1; }
.category-card .card-link {
  margin-top: 16px; display: inline-flex; align-items: center; gap: 6px;
  font-weight: 600; font-size: 0.88rem; color: var(--color-accent);
  transition: gap var(--transition);
}
.category-card .card-link i { font-size: 0.75rem; transition: transform var(--transition); }
.category-card:hover .card-link { gap: 10px; }
.category-card:hover .card-link i { transform: translateX(4px); }

/* ===== News / Content List ===== */
.news-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--gap); }
.news-card {
  background: var(--color-white); border-radius: var(--radius-md);
  padding: 24px 28px; box-shadow: var(--shadow-sm);
  transition: all var(--transition); border: 1px solid var(--color-border-light);
  display: flex; flex-direction: column;
}
.news-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: transparent; }
.news-card .news-meta {
  display: flex; align-items: center; gap: 12px;
  font-size: 0.78rem; color: var(--color-text-lighter); margin-bottom: 10px;
}
.news-card .news-meta .news-cat {
  background: rgba(212,163,69,0.10); color: var(--color-accent);
  padding: 2px 10px; border-radius: 20px; font-weight: 600; font-size: 0.7rem;
}
.news-card .news-meta .news-date { display: flex; align-items: center; gap: 4px; }
.news-card .news-meta .news-date i { font-size: 0.65rem; }
.news-card h3 { font-size: 1.05rem; margin-bottom: 8px; line-height: 1.4; }
.news-card h3 a { color: var(--color-primary); }
.news-card h3 a:hover { color: var(--color-accent); }
.news-card p { font-size: 0.88rem; color: var(--color-text-light); line-height: 1.7; flex: 1; }
.news-card .news-footer {
  margin-top: 14px; display: flex; align-items: center; justify-content: space-between;
}
.news-card .news-footer .read-more {
  font-size: 0.82rem; font-weight: 600; color: var(--color-accent);
  display: inline-flex; align-items: center; gap: 4px;
}
.news-card .news-footer .read-more i { font-size: 0.7rem; transition: transform var(--transition); }
.news-card .news-footer .read-more:hover i { transform: translateX(4px); }
.news-empty {
  grid-column: 1 / -1; text-align: center; padding: 48px 24px;
  color: var(--color-text-lighter); font-size: 1rem;
  background: var(--color-white); border-radius: var(--radius-md);
  border: 1px dashed var(--color-border);
}

/* ===== Stats / Data Section ===== */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--gap); }
.stat-card {
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md); padding: 32px 24px; text-align: center;
  transition: all var(--transition);
}
.stat-card:hover { background: rgba(255,255,255,0.06); border-color: rgba(212,163,69,0.20); transform: translateY(-2px); }
.stat-card .stat-icon {
  width: 48px; height: 48px; margin: 0 auto 14px;
  background: rgba(212,163,69,0.12); border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; color: var(--color-accent);
}
.stat-card .stat-num { font-size: 2rem; font-weight: 800; color: var(--color-white); line-height: 1.2; }
.stat-card .stat-num span { color: var(--color-accent); }
.stat-card .stat-label { font-size: 0.85rem; color: rgba(255,255,255,0.55); margin-top: 6px; }

/* ===== Process / Steps ===== */
.process-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: var(--gap); }
.process-step {
  text-align: center; position: relative;
}
.process-step .step-num {
  width: 48px; height: 48px; margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-orange));
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 1.15rem; font-weight: 800; color: var(--color-primary);
  position: relative; z-index: 2;
}
.process-step .step-line {
  position: absolute; top: 24px; left: calc(50% + 32px); right: calc(-50% + 32px);
  height: 2px; background: linear-gradient(90deg, var(--color-accent), rgba(212,163,69,0.20));
  z-index: 1;
}
.process-step:last-child .step-line { display: none; }
.process-step h4 { font-size: 1rem; margin-bottom: 6px; color: var(--color-primary); }
.process-step p { font-size: 0.82rem; color: var(--color-text-light); line-height: 1.6; max-width: 160px; margin: 0 auto; }

/* ===== FAQ ===== */
.faq-list { max-width: 780px; margin: 0 auto; }
.faq-item {
  background: var(--color-white); border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-light); margin-bottom: 10px;
  overflow: hidden; transition: all var(--transition);
}
.faq-item:hover { border-color: var(--color-border); }
.faq-question {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 24px; cursor: pointer; font-weight: 600;
  font-size: 0.98rem; color: var(--color-text); transition: color var(--transition);
  user-select: none;
}
.faq-question i { font-size: 0.8rem; color: var(--color-text-lighter); transition: transform var(--transition); }
.faq-item.active .faq-question { color: var(--color-accent); }
.faq-item.active .faq-question i { transform: rotate(180deg); color: var(--color-accent); }
.faq-answer {
  max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 24px; color: var(--color-text-light); font-size: 0.9rem; line-height: 1.7;
}
.faq-item.active .faq-answer { max-height: 300px; padding: 0 24px 18px; }

/* ===== CTA Section ===== */
.cta-section {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  position: relative; overflow: hidden;
}
.cta-section::before {
  content: ''; position: absolute; inset: 0;
  background-image: url('/assets/images/backpic/back-2.png');
  background-size: cover; background-position: center;
  opacity: 0.08; filter: saturate(1.2);
}
.cta-section .container { position: relative; z-index: 2; text-align: center; }
.cta-section h2 { color: var(--color-white); font-size: 2rem; margin-bottom: 12px; }
.cta-section p { color: rgba(255,255,255,0.65); font-size: 1.05rem; max-width: 560px; margin: 0 auto 28px; }
.cta-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; }

/* ===== Footer ===== */
.site-footer {
  background: var(--color-primary-dark); color: rgba(255,255,255,0.5);
  padding: 48px 0 32px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--gap-lg); }
.footer-brand .footer-logo {
  font-size: 1.15rem; font-weight: 700; color: var(--color-white); margin-bottom: 10px;
}
.footer-brand .footer-logo span { color: var(--color-accent); }
.footer-brand p { font-size: 0.85rem; color: rgba(255,255,255,0.4); line-height: 1.7; max-width: 280px; }
.footer-col h4 { font-size: 0.88rem; color: var(--color-white); margin-bottom: 14px; font-weight: 600; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a {
  font-size: 0.85rem; color: rgba(255,255,255,0.45);
  transition: color var(--transition); display: inline-flex; align-items: center; gap: 6px;
}
.footer-col ul li a:hover { color: var(--color-accent); }
.footer-col ul li a i { font-size: 0.65rem; opacity: 0; transition: opacity var(--transition); }
.footer-col ul li a:hover i { opacity: 1; }
.footer-bottom {
  margin-top: 36px; padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.06);
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 12px; font-size: 0.8rem;
}
.footer-bottom a { color: rgba(255,255,255,0.4); }
.footer-bottom a:hover { color: var(--color-accent); }

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed; bottom: 30px; right: 30px; z-index: 800;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--color-accent); color: var(--color-primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; box-shadow: var(--shadow-md);
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: all var(--transition); cursor: pointer;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--color-accent-hover); transform: translateY(-3px); box-shadow: var(--shadow-lg); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .categories-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .process-grid { grid-template-columns: repeat(3, 1fr); }
  .process-step .step-line { display: none; }
  .footer-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
  .hero h1 { font-size: 2.5rem; }
}

@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; }
  .mobile-topbar { display: flex; }
  .sidebar-overlay.active { display: block; }
  .hero { padding: 60px 0 60px; min-height: auto; }
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .hero-stat-item .num { font-size: 1.4rem; }
  .features-grid { grid-template-columns: 1fr; }
  .categories-grid { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .stat-card { padding: 24px 16px; }
  .stat-card .stat-num { font-size: 1.5rem; }
  .process-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .section { padding: 48px 0; }
  .section-title { font-size: 1.5rem; }
  .section-header { margin-bottom: 32px; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .btn-lg { padding: 12px 28px; font-size: 1rem; text-align: center; }
  .container { padding: 0 16px; }
  .back-to-top { bottom: 20px; right: 20px; width: 40px; height: 40px; font-size: 0.9rem; }
}

@media (max-width: 520px) {
  .hero h1 { font-size: 1.6rem; }
  .hero p { font-size: 0.92rem; }
  .hero-stats { gap: 16px; }
  .hero-stat-item .num { font-size: 1.2rem; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .process-grid { grid-template-columns: 1fr; }
  .stat-card .stat-num { font-size: 1.3rem; }
  .section-title { font-size: 1.3rem; }
  .news-card { padding: 18px 20px; }
  .faq-question { padding: 14px 18px; font-size: 0.9rem; }
  .category-card .card-img { height: 140px; }
}

/* ===== Utility ===== */
.text-center { text-align: center; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }

/* ===== Skeleton loading state ===== */
@keyframes shimmer { 0% { background-position: -200% 0; } 100% { background-position: 200% 0; } }
.skeleton {
  background: linear-gradient(90deg, var(--color-bg-dark) 25%, var(--color-border-light) 50%, var(--color-bg-dark) 75%);
  background-size: 200% 100%; animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a73e8;
            --primary-dark: #0d47a1;
            --primary-light: #4fc3f7;
            --secondary: #ff6f00;
            --secondary-light: #ffa726;
            --accent: #00c853;
            --bg-dark: #0a0e17;
            --bg-card: #111827;
            --bg-card-hover: #1a2332;
            --bg-sidebar: #0d1117;
            --bg-body: #0a0e17;
            --text-white: #f0f4ff;
            --text-light: #c9d1d9;
            --text-muted: #8b949e;
            --text-dark: #e6edf3;
            --border-color: #1e2d3d;
            --border-light: #2d3f50;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
            --sidebar-width: 240px;
            --header-height: 0px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }

        body {
            font-family: var(--font-base);
            background: var(--bg-body);
            color: var(--text-light);
            line-height: 1.7;
            font-size: 16px;
            display: flex;
            min-height: 100vh;
        }

        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary-light);
        }
        a:focus-visible {
            outline: 2px solid var(--primary-light);
            outline-offset: 2px;
            border-radius: 4px;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }

        button {
            cursor: pointer;
        }

        ul {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            color: var(--text-white);
            line-height: 1.3;
            font-weight: 700;
        }

        /* ===== Container ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Sidebar Navigation ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-sidebar);
            border-right: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            overflow-y: auto;
            transition: transform var(--transition);
        }

        .sidebar-logo {
            padding: 24px 20px 20px;
            border-bottom: 1px solid var(--border-color);
        }

        .sidebar-logo a {
            font-size: 22px;
            font-weight: 800;
            color: var(--text-white);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .sidebar-logo a span {
            color: var(--primary-light);
        }

        .sidebar-logo a i {
            color: var(--secondary);
            font-size: 20px;
            margin-right: 4px;
        }

        .sidebar-nav {
            padding: 16px 12px;
            flex: 1;
        }

        .nav-label {
            font-size: 11px;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: var(--text-muted);
            padding: 8px 12px 12px;
            font-weight: 600;
        }

        .nav-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 14px;
            border-radius: var(--radius-sm);
            color: var(--text-muted);
            font-size: 15px;
            font-weight: 500;
            transition: var(--transition);
            margin-bottom: 2px;
        }

        .nav-item i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            color: var(--text-muted);
            transition: var(--transition);
        }

        .nav-item:hover {
            background: rgba(255, 255, 255, 0.05);
            color: var(--text-light);
        }
        .nav-item:hover i {
            color: var(--primary-light);
        }

        .nav-item.active {
            background: rgba(26, 115, 232, 0.12);
            color: var(--primary-light);
        }
        .nav-item.active i {
            color: var(--primary-light);
        }

        /* ===== Main Content Area ===== */
        .main-wrapper {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== Article Header ===== */
        .article-header {
            background: linear-gradient(135deg, var(--bg-dark) 0%, #0d1b2a 100%);
            padding: 48px 0 40px;
            border-bottom: 1px solid var(--border-color);
            position: relative;
        }

        .article-header::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.08;
            pointer-events: none;
        }

        .article-breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 20px;
            flex-wrap: wrap;
        }

        .article-breadcrumb a {
            color: var(--text-muted);
        }
        .article-breadcrumb a:hover {
            color: var(--primary-light);
        }
        .article-breadcrumb i {
            font-size: 12px;
            color: var(--text-muted);
        }

        .article-meta-top {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 16px;
        }

        .article-category-badge {
            display: inline-block;
            background: rgba(26, 115, 232, 0.15);
            color: var(--primary-light);
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.3px;
        }

        .article-date {
            font-size: 14px;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .article-date i {
            font-size: 13px;
        }

        .article-title {
            font-size: 32px;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.25;
            max-width: 860px;
        }

        /* ===== Article Body ===== */
        .article-body-section {
            padding: 48px 0 56px;
            background: var(--bg-body);
        }

        .article-layout {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }

        .article-content {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 40px;
            min-height: 320px;
        }

        .article-content p {
            margin-bottom: 20px;
            color: var(--text-light);
            font-size: 16px;
            line-height: 1.8;
        }

        .article-content h2 {
            font-size: 24px;
            margin-top: 36px;
            margin-bottom: 16px;
            color: var(--text-white);
        }

        .article-content h3 {
            font-size: 20px;
            margin-top: 28px;
            margin-bottom: 12px;
            color: var(--text-white);
        }

        .article-content img {
            border-radius: var(--radius-sm);
            margin: 24px 0;
            width: 100%;
            object-fit: cover;
        }

        .article-content ul,
        .article-content ol {
            margin-bottom: 20px;
            padding-left: 24px;
            color: var(--text-light);
        }

        .article-content li {
            margin-bottom: 8px;
        }

        .article-content blockquote {
            border-left: 4px solid var(--primary);
            padding: 16px 20px;
            margin: 24px 0;
            background: rgba(26, 115, 232, 0.06);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-light);
            font-style: italic;
        }

        .article-content a {
            color: var(--primary-light);
            text-decoration: underline;
        }
        .article-content a:hover {
            color: var(--secondary-light);
        }

        .article-not-found {
            text-align: center;
            padding: 60px 20px;
        }

        .article-not-found i {
            font-size: 56px;
            color: var(--text-muted);
            margin-bottom: 20px;
        }

        .article-not-found h2 {
            font-size: 28px;
            margin-bottom: 12px;
        }

        .article-not-found p {
            color: var(--text-muted);
            margin-bottom: 24px;
        }

        .article-not-found .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary);
            color: #fff;
            padding: 10px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: var(--transition);
        }

        .article-not-found .btn-back:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        /* ===== Sidebar (Article) ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }

        .sidebar-widget {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
        }

        .sidebar-widget h3 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            gap: 8px;
            color: var(--text-white);
        }

        .sidebar-widget h3 i {
            color: var(--primary-light);
            font-size: 16px;
        }

        .sidebar-related-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .sidebar-related-item {
            display: flex;
            gap: 12px;
            align-items: flex-start;
            padding: 8px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.04);
        }

        .sidebar-related-item:last-child {
            border-bottom: none;
        }

        .sidebar-related-item img {
            width: 64px;
            height: 48px;
            border-radius: 4px;
            object-fit: cover;
            flex-shrink: 0;
            background: var(--bg-card-hover);
        }

        .sidebar-related-item .related-info {
            flex: 1;
            min-width: 0;
        }

        .sidebar-related-item .related-title {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-light);
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            transition: var(--transition);
        }

        .sidebar-related-item .related-title:hover {
            color: var(--primary-light);
        }

        .sidebar-related-item .related-date {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        .sidebar-cta-widget {
            background: linear-gradient(135deg, rgba(26, 115, 232, 0.08), rgba(255, 111, 0, 0.06));
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            text-align: center;
        }

        .sidebar-cta-widget h3 {
            font-size: 18px;
            margin-bottom: 8px;
            border-bottom: none;
            padding-bottom: 0;
            justify-content: center;
        }

        .sidebar-cta-widget p {
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 16px;
        }

        .btn-cta-sidebar {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--secondary);
            color: #fff;
            padding: 10px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: var(--transition);
        }

        .btn-cta-sidebar:hover {
            background: #e65100;
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
            color: #fff;
        }

        /* ===== Related Articles Section ===== */
        .related-section {
            padding: 48px 0 56px;
            background: var(--bg-dark);
            border-top: 1px solid var(--border-color);
        }

        .related-section .section-title {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 32px;
            text-align: center;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .related-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition);
        }

        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--border-light);
        }

        .related-card img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            background: var(--bg-card-hover);
        }

        .related-card-body {
            padding: 20px;
        }

        .related-card-body .related-cat {
            font-size: 12px;
            color: var(--primary-light);
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 8px;
        }

        .related-card-body h4 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .related-card-body h4 a {
            color: var(--text-white);
        }
        .related-card-body h4 a:hover {
            color: var(--primary-light);
        }

        .related-card-body p {
            font-size: 14px;
            color: var(--text-muted);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .related-card-body .related-meta {
            font-size: 13px;
            color: var(--text-muted);
            margin-top: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        /* ===== FAQ Section ===== */
        .faq-section {
            padding: 48px 0 56px;
            background: var(--bg-body);
        }

        .faq-section .section-title {
            font-size: 24px;
            font-weight: 700;
            text-align: center;
            margin-bottom: 8px;
        }

        .faq-section .section-subtitle {
            text-align: center;
            color: var(--text-muted);
            margin-bottom: 36px;
            font-size: 16px;
        }

        .faq-grid {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover {
            border-color: var(--border-light);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 20px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-white);
            background: transparent;
            width: 100%;
            text-align: left;
            transition: var(--transition);
            gap: 12px;
        }

        .faq-question i {
            color: var(--primary-light);
            font-size: 14px;
            transition: transform 0.3s;
            flex-shrink: 0;
        }

        .faq-question.open i {
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 20px;
            color: var(--text-muted);
            font-size: 15px;
            line-height: 1.7;
        }

        .faq-answer.open {
            max-height: 300px;
            padding: 0 20px 18px;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            padding: 56px 0;
            background: linear-gradient(135deg, #0d1b2a, #0a0e17);
            border-top: 1px solid var(--border-color);
            text-align: center;
        }

        .cta-section h2 {
            font-size: 28px;
            font-weight: 800;
            margin-bottom: 12px;
        }

        .cta-section p {
            color: var(--text-muted);
            font-size: 16px;
            max-width: 600px;
            margin: 0 auto 28px;
        }

        .cta-buttons {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--primary);
            color: #fff;
            padding: 12px 32px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 16px;
            transition: var(--transition);
            border: none;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
            color: #fff;
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: var(--text-light);
            padding: 12px 32px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 16px;
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.05);
            border-color: var(--text-muted);
            color: var(--text-white);
            transform: translateY(-2px);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-sidebar);
            border-top: 1px solid var(--border-color);
            padding: 48px 0 24px;
            margin-top: auto;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }

        .footer-brand .footer-logo {
            font-size: 22px;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 12px;
        }

        .footer-brand .footer-logo span {
            color: var(--primary-light);
        }

        .footer-brand p {
            color: var(--text-muted);
            font-size: 14px;
            line-height: 1.7;
            max-width: 320px;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
        }

        .footer-col ul li {
            margin-bottom: 10px;
        }

        .footer-col ul li a {
            color: var(--text-muted);
            font-size: 14px;
            display: flex;
            align-items: center;
            gap: 6px;
            transition: var(--transition);
        }

        .footer-col ul li a i {
            font-size: 10px;
            color: var(--primary-light);
        }

        .footer-col ul li a:hover {
            color: var(--primary-light);
            padding-left: 4px;
        }

        .footer-bottom {
            border-top: 1px solid var(--border-color);
            padding-top: 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 14px;
            color: var(--text-muted);
        }

        .footer-bottom a {
            color: var(--text-muted);
        }
        .footer-bottom a:hover {
            color: var(--primary-light);
        }

        /* ===== Mobile Toggle ===== */
        .sidebar-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            color: var(--text-white);
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            font-size: 20px;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
            cursor: pointer;
        }

        .sidebar-toggle:hover {
            background: var(--bg-card-hover);
        }

        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.6);
            z-index: 999;
            backdrop-filter: blur(4px);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
            }

            .article-sidebar {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }

            .related-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }

            .sidebar.open {
                transform: translateX(0);
            }

            .sidebar-overlay.open {
                display: block;
            }

            .sidebar-toggle {
                display: flex;
            }

            .main-wrapper {
                margin-left: 0;
            }

            .article-header {
                padding: 32px 0 28px;
            }

            .article-title {
                font-size: 24px;
            }

            .article-content {
                padding: 24px;
            }

            .article-sidebar {
                grid-template-columns: 1fr;
            }

            .related-grid {
                grid-template-columns: 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .cta-section h2 {
                font-size: 22px;
            }

            .cta-buttons {
                flex-direction: column;
                align-items: stretch;
            }

            .btn-primary,
            .btn-secondary {
                justify-content: center;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }

            .article-title {
                font-size: 20px;
            }

            .article-content {
                padding: 16px;
            }

            .article-content h2 {
                font-size: 20px;
            }

            .article-content h3 {
                font-size: 18px;
            }

            .article-meta-top {
                gap: 10px;
            }

            .related-card img {
                height: 150px;
            }
        }

        /* ===== Scrollbar ===== */
        .sidebar::-webkit-scrollbar {
            width: 4px;
        }
        .sidebar::-webkit-scrollbar-track {
            background: transparent;
        }
        .sidebar::-webkit-scrollbar-thumb {
            background: var(--border-light);
            border-radius: 4px;
        }
        .sidebar::-webkit-scrollbar-thumb:hover {
            background: var(--text-muted);
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-8 {
            margin-top: 8px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mb-8 {
            margin-bottom: 8px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #e11d2f;
            --primary-dark: #b0101e;
            --primary-light: #fce4e6;
            --secondary: #1a1a2e;
            --secondary-light: #2d2d4a;
            --accent: #f5a623;
            --accent-light: #fef3d7;
            --bg-body: #f4f6f9;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-dark: #0f0f1a;
            --text-primary: #1a1a2e;
            --text-secondary: #4a4a6a;
            --text-light: #8888a8;
            --text-white: #ffffff;
            --border-color: #e8e8f0;
            --border-light: #f0f0f5;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --sidebar-width: 240px;
            --header-height: 0px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', sans-serif;
            --max-width: 1280px;
            --gap-section: 60px;
            --gap-grid: 24px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            display: flex;
            min-height: 100vh;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            outline: none;
            transition: var(--transition);
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text-primary);
        }
        p {
            color: var(--text-secondary);
            margin-bottom: 0.5rem;
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-body);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--border-color);
            border-radius: 12px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-light);
        }

        /* ===== Sidebar Navigation ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-white);
            border-right: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: var(--transition);
            box-shadow: 2px 0 16px rgba(0, 0, 0, 0.04);
        }
        .sidebar-logo {
            display: flex;
            align-items: center;
            padding: 24px 20px 20px;
            border-bottom: 1px solid var(--border-light);
        }
        .sidebar-logo .logo-text {
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.3px;
            line-height: 1.2;
        }
        .sidebar-logo .logo-text span {
            color: var(--secondary);
        }
        .sidebar-logo .logo-text small {
            font-size: 0.7rem;
            font-weight: 400;
            color: var(--text-light);
            display: block;
            letter-spacing: 0.3px;
        }
        .sidebar-nav {
            flex: 1;
            padding: 16px 12px;
            overflow-y: auto;
        }
        .nav-label {
            font-size: 0.65rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.8px;
            color: var(--text-light);
            padding: 8px 12px 6px;
            margin-bottom: 4px;
        }
        .sidebar-nav .nav-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 16px;
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.9rem;
            transition: var(--transition);
            margin-bottom: 2px;
        }
        .sidebar-nav .nav-item i {
            width: 20px;
            text-align: center;
            font-size: 1rem;
            color: var(--text-light);
            transition: var(--transition);
        }
        .sidebar-nav .nav-item:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .sidebar-nav .nav-item:hover i {
            color: var(--primary);
        }
        .sidebar-nav .nav-item.active {
            background: var(--primary);
            color: var(--text-white);
            box-shadow: 0 4px 12px rgba(225, 29, 47, 0.3);
        }
        .sidebar-nav .nav-item.active i {
            color: var(--text-white);
        }

        /* ===== Main Content Area ===== */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== Page Header / Banner ===== */
        .page-banner {
            background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-light) 100%);
            padding: 48px 0 40px;
            position: relative;
            overflow: hidden;
            min-height: 220px;
            display: flex;
            align-items: center;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            top: -30%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(225, 29, 47, 0.15) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .page-banner::after {
            content: '';
            position: absolute;
            bottom: -20%;
            left: 5%;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(245, 166, 35, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .page-banner .container {
            position: relative;
            z-index: 1;
        }
        .page-banner h1 {
            font-size: 2.4rem;
            color: var(--text-white);
            margin-bottom: 10px;
            font-weight: 800;
            letter-spacing: -0.5px;
        }
        .page-banner h1 i {
            color: var(--accent);
            margin-right: 8px;
        }
        .page-banner p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 640px;
            line-height: 1.7;
        }
        .page-banner .breadcrumb {
            display: flex;
            gap: 8px;
            align-items: center;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 16px;
        }
        .page-banner .breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
        }
        .page-banner .breadcrumb a:hover {
            color: var(--text-white);
        }
        .page-banner .breadcrumb .sep {
            color: rgba(255, 255, 255, 0.4);
        }

        /* ===== Section Base ===== */
        .section {
            padding: var(--gap-section) 0;
        }
        .section-title {
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: 8px;
            color: var(--text-primary);
            letter-spacing: -0.3px;
        }
        .section-subtitle {
            font-size: 1rem;
            color: var(--text-light);
            margin-bottom: 32px;
            max-width: 560px;
        }
        .section-header {
            display: flex;
            justify-content: space-between;
            align-items: flex-end;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 32px;
        }
        .section-header .section-title {
            margin-bottom: 4px;
        }
        .section-header .section-subtitle {
            margin-bottom: 0;
        }
        .section-link {
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 6px;
            white-space: nowrap;
        }
        .section-link:hover {
            gap: 10px;
        }
        .section-link i {
            font-size: 0.75rem;
        }

        /* ===== Card Grid ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--gap-grid);
        }
        .card-grid.col-2 {
            grid-template-columns: repeat(2, 1fr);
        }
        .card-grid.col-4 {
            grid-template-columns: repeat(4, 1fr);
        }

        /* ===== Article Card ===== */
        .article-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--border-light);
            display: flex;
            flex-direction: column;
        }
        .article-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--border-color);
        }
        .article-card .card-img {
            width: 100%;
            aspect-ratio: 16/10;
            object-fit: cover;
            display: block;
            background: var(--border-light);
        }
        .article-card .card-body {
            padding: 20px 22px 22px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .article-card .card-tags {
            display: flex;
            gap: 8px;
            margin-bottom: 10px;
            flex-wrap: wrap;
        }
        .article-card .card-tag {
            font-size: 0.7rem;
            font-weight: 600;
            padding: 2px 12px;
            border-radius: 20px;
            background: var(--primary-light);
            color: var(--primary);
        }
        .article-card .card-tag.tag-accent {
            background: var(--accent-light);
            color: #b87a10;
        }
        .article-card .card-tag.tag-soft {
            background: var(--bg-body);
            color: var(--text-secondary);
        }
        .article-card h3 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
            color: var(--text-primary);
        }
        .article-card h3 a {
            color: inherit;
        }
        .article-card h3 a:hover {
            color: var(--primary);
        }
        .article-card .card-excerpt {
            font-size: 0.85rem;
            color: var(--text-light);
            line-height: 1.6;
            flex: 1;
            margin-bottom: 12px;
        }
        .article-card .card-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 12px;
            border-top: 1px solid var(--border-light);
            font-size: 0.78rem;
            color: var(--text-light);
        }
        .article-card .card-meta i {
            margin-right: 4px;
            font-size: 0.7rem;
        }
        .article-card .card-meta .read-more {
            color: var(--primary);
            font-weight: 600;
            font-size: 0.78rem;
        }
        .article-card .card-meta .read-more:hover {
            text-decoration: underline;
        }

        /* ===== Feature Grid (图文区块) ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .feature-grid.reverse {
            direction: rtl;
        }
        .feature-grid.reverse>* {
            direction: ltr;
        }
        .feature-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }
        .feature-image img {
            width: 100%;
            height: 380px;
            object-fit: cover;
        }
        .feature-content h2 {
            font-size: 1.8rem;
            margin-bottom: 16px;
            font-weight: 800;
        }
        .feature-content p {
            font-size: 1rem;
            line-height: 1.8;
            margin-bottom: 16px;
        }
        .feature-content .feature-list {
            margin-top: 16px;
        }
        .feature-content .feature-list li {
            display: flex;
            gap: 12px;
            align-items: flex-start;
            padding: 8px 0;
            font-size: 0.95rem;
            color: var(--text-secondary);
        }
        .feature-content .feature-list li i {
            color: var(--primary);
            margin-top: 3px;
            font-size: 0.9rem;
            min-width: 18px;
        }

        /* ===== Stats / Data Block ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .stat-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .stat-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .stat-card .stat-icon {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 8px;
        }
        .stat-card .stat-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--text-primary);
            line-height: 1.2;
        }
        .stat-card .stat-number span {
            font-size: 1rem;
            font-weight: 400;
            color: var(--text-light);
        }
        .stat-card .stat-label {
            font-size: 0.85rem;
            color: var(--text-light);
            margin-top: 4px;
        }

        /* ===== Tab Filter ===== */
        .tab-filter {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            margin-bottom: 28px;
        }
        .tab-filter .tab-btn {
            padding: 8px 20px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 600;
            background: var(--bg-white);
            color: var(--text-secondary);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .tab-filter .tab-btn:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-light);
        }
        .tab-filter .tab-btn.active {
            background: var(--primary);
            color: var(--text-white);
            border-color: var(--primary);
            box-shadow: 0 4px 12px rgba(225, 29, 47, 0.25);
        }

        /* ===== List Group ===== */
        .list-group {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
        }
        .list-group .list-item {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 18px 24px;
            border-bottom: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .list-group .list-item:last-child {
            border-bottom: none;
        }
        .list-group .list-item:hover {
            background: var(--primary-light);
        }
        .list-group .list-item .item-rank {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: var(--bg-body);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 0.85rem;
            color: var(--text-secondary);
            flex-shrink: 0;
        }
        .list-group .list-item .item-rank.top {
            background: var(--accent);
            color: var(--text-white);
        }
        .list-group .list-item .item-info {
            flex: 1;
            min-width: 0;
        }
        .list-group .list-item .item-info h4 {
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 2px;
        }
        .list-group .list-item .item-info p {
            font-size: 0.8rem;
            color: var(--text-light);
            margin: 0;
        }
        .list-group .list-item .item-meta {
            font-size: 0.8rem;
            color: var(--text-light);
            white-space: nowrap;
        }
        .list-group .list-item .item-meta i {
            margin-right: 4px;
        }

        /* ===== FAQ ===== */
        .faq-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            padding: 20px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-md);
        }
        .faq-item .faq-q {
            font-weight: 700;
            font-size: 0.95rem;
            color: var(--text-primary);
            display: flex;
            gap: 10px;
            align-items: flex-start;
            margin-bottom: 6px;
        }
        .faq-item .faq-q i {
            color: var(--primary);
            margin-top: 2px;
            font-size: 0.85rem;
        }
        .faq-item .faq-a {
            font-size: 0.88rem;
            color: var(--text-light);
            line-height: 1.7;
            padding-left: 26px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-light) 100%);
            border-radius: var(--radius-xl);
            padding: 60px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(225, 29, 47, 0.12) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-section h2 {
            font-size: 2rem;
            color: var(--text-white);
            margin-bottom: 12px;
            font-weight: 800;
        }
        .cta-section p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-section .btn-group {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: 30px;
            font-weight: 700;
            font-size: 0.95rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn-primary {
            background: var(--primary);
            color: var(--text-white);
            box-shadow: 0 4px 16px rgba(225, 29, 47, 0.3);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(225, 29, 47, 0.4);
            color: var(--text-white);
        }
        .btn-outline-light {
            background: transparent;
            color: var(--text-white);
            border: 2px solid rgba(255, 255, 255, 0.4);
        }
        .btn-outline-light:hover {
            border-color: var(--text-white);
            background: rgba(255, 255, 255, 0.1);
            color: var(--text-white);
            transform: translateY(-2px);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.8);
            padding: 48px 0 0;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .footer-logo {
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 12px;
        }
        .footer-brand .footer-logo span {
            color: var(--primary);
        }
        .footer-brand p {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.55);
            line-height: 1.7;
            max-width: 300px;
        }
        .footer-col h4 {
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.85rem;
            display: flex;
            align-items: center;
            gap: 6px;
            transition: var(--transition);
        }
        .footer-col ul li a i {
            font-size: 0.6rem;
            color: var(--primary);
        }
        .footer-col ul li a:hover {
            color: var(--text-white);
            padding-left: 4px;
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.4);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom a:hover {
            color: var(--text-white);
        }

        /* ===== Mobile Sidebar Toggle ===== */
        .sidebar-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: var(--bg-white);
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-color);
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--text-primary);
            cursor: pointer;
            transition: var(--transition);
        }
        .sidebar-toggle:hover {
            background: var(--primary);
            color: var(--text-white);
            border-color: var(--primary);
        }
        .sidebar-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.4);
            z-index: 999;
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        .sidebar-overlay.show {
            opacity: 1;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .card-grid.col-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .feature-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .feature-grid.reverse {
                direction: ltr;
            }
            .feature-image img {
                height: 260px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .faq-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .page-banner h1 {
                font-size: 1.9rem;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .cta-section {
                padding: 40px 28px;
            }
            .cta-section h2 {
                font-size: 1.6rem;
            }
        }

        @media (max-width: 768px) {
            :root {
                --sidebar-width: 0px;
                --gap-section: 40px;
            }
            .sidebar {
                transform: translateX(-100%);
                width: 280px;
                box-shadow: none;
            }
            .sidebar.open {
                transform: translateX(0);
                box-shadow: 4px 0 32px rgba(0, 0, 0, 0.2);
            }
            .sidebar-toggle {
                display: flex;
            }
            .sidebar-overlay {
                display: block;
                pointer-events: none;
            }
            .sidebar-overlay.show {
                pointer-events: auto;
            }
            .main-content {
                margin-left: 0;
                padding-top: 0;
            }
            .page-banner {
                padding: 36px 0 28px;
                min-height: 180px;
            }
            .page-banner h1 {
                font-size: 1.5rem;
            }
            .page-banner p {
                font-size: 0.95rem;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .card-grid.col-2 {
                grid-template-columns: 1fr;
            }
            .card-grid.col-4 {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .stat-card {
                padding: 20px 16px;
            }
            .stat-card .stat-number {
                font-size: 1.6rem;
            }
            .section-header {
                flex-direction: column;
                align-items: flex-start;
            }
            .tab-filter {
                overflow-x: auto;
                flex-wrap: nowrap;
                padding-bottom: 4px;
                -webkit-overflow-scrolling: touch;
            }
            .tab-filter .tab-btn {
                white-space: nowrap;
                flex-shrink: 0;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-section {
                padding: 32px 20px;
                border-radius: var(--radius-md);
            }
            .cta-section h2 {
                font-size: 1.3rem;
            }
            .cta-section .btn-group {
                flex-direction: column;
                align-items: center;
            }
            .btn {
                width: 100%;
                max-width: 280px;
                justify-content: center;
            }
            .container {
                padding: 0 16px;
            }
            .feature-image img {
                height: 200px;
            }
            .list-group .list-item {
                padding: 14px 16px;
                flex-wrap: wrap;
            }
        }

        @media (max-width: 480px) {
            .page-banner h1 {
                font-size: 1.3rem;
            }
            .page-banner p {
                font-size: 0.85rem;
            }
            .section-title {
                font-size: 1.3rem;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 8px;
            }
            .stat-card .stat-number {
                font-size: 1.4rem;
            }
            .stat-card .stat-icon {
                font-size: 1.5rem;
            }
            .faq-item {
                padding: 16px 18px;
            }
            .article-card .card-body {
                padding: 16px 18px 18px;
            }
        }

        /* ===== Extra Utilities ===== */
        .text-center {
            text-align: center;
        }
        .mt-1 {
            margin-top: 12px;
        }
        .mt-2 {
            margin-top: 24px;
        }
        .mb-1 {
            margin-bottom: 12px;
        }
        .mb-2 {
            margin-bottom: 24px;
        }
        .gap-1 {
            gap: 12px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .w-full {
            width: 100%;
        }
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 2px 12px;
            border-radius: 20px;
            font-size: 0.7rem;
            font-weight: 600;
            background: var(--primary-light);
            color: var(--primary);
        }
        .badge-accent {
            background: var(--accent-light);
            color: #b87a10;
        }
        .badge-soft {
            background: var(--bg-body);
            color: var(--text-secondary);
        }
        .divider {
            width: 100%;
            height: 1px;
            background: var(--border-color);
            margin: 16px 0;
        }

/* roulang page: category3 */
/* ========== 设计变量 ========== */
        :root {
            --primary: #1a3a6b;
            --primary-light: #2a5a9b;
            --primary-dark: #0f2240;
            --accent: #e6a800;
            --accent-light: #ffc933;
            --accent-dark: #c48c00;
            --bg-body: #f4f6fb;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-dark: #0f1a2e;
            --bg-sidebar: #0f1a2e;
            --text-primary: #1a2332;
            --text-secondary: #4a5568;
            --text-light: #8899aa;
            --text-white: #ffffff;
            --text-on-accent: #1a2332;
            --border-light: #e2e8f0;
            --border-card: #edf2f7;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.10);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-full: 50px;
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --sidebar-width: 240px;
            --header-height: 0px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
        }

        /* ========== Reset & Base ========== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-family);
            background: var(--bg-body);
            color: var(--text-primary);
            line-height: 1.6;
            font-size: 16px;
            display: flex;
            min-height: 100vh;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }

        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }

        ul,
        ol {
            list-style: none;
        }

        /* ========== Sidebar (左侧导航) ========== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-sidebar);
            color: var(--text-white);
            z-index: 1000;
            display: flex;
            flex-direction: column;
            padding: 24px 0 20px;
            transition: transform var(--transition);
            box-shadow: 2px 0 20px rgba(0, 0, 0, 0.2);
            overflow-y: auto;
        }

        .sidebar-logo {
            padding: 0 20px 28px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            margin-bottom: 16px;
            display: flex;
            align-items: center;
        }

        .sidebar-logo .logo-text {
            font-size: 22px;
            font-weight: 700;
            letter-spacing: -0.5px;
            color: #fff;
        }

        .sidebar-logo .logo-text span {
            color: var(--accent);
        }

        .sidebar-logo .logo-sub {
            font-size: 12px;
            color: var(--text-light);
            margin-top: 2px;
            opacity: 0.7;
        }

        .nav-label {
            font-size: 11px;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: rgba(255, 255, 255, 0.35);
            padding: 8px 20px 12px;
            font-weight: 600;
        }

        .sidebar-nav {
            display: flex;
            flex-direction: column;
            gap: 2px;
            padding: 0 12px;
            flex: 1;
        }

        .sidebar-nav .nav-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.7);
            transition: all var(--transition);
            position: relative;
        }

        .sidebar-nav .nav-item i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            flex-shrink: 0;
        }

        .sidebar-nav .nav-item:hover {
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
        }

        .sidebar-nav .nav-item.active {
            background: rgba(230, 168, 0, 0.15);
            color: var(--accent);
            font-weight: 600;
        }

        .sidebar-nav .nav-item.active::before {
            content: '';
            position: absolute;
            left: -12px;
            top: 50%;
            transform: translateY(-50%);
            width: 4px;
            height: 24px;
            background: var(--accent);
            border-radius: 0 4px 4px 0;
        }

        /* ========== 主内容区 ========== */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            width: calc(100% - var(--sidebar-width));
        }

        /* ========== 顶部移动端工具栏 ========== */
        .mobile-topbar {
            display: none;
            background: var(--bg-sidebar);
            padding: 12px 20px;
            align-items: center;
            justify-content: space-between;
            position: sticky;
            top: 0;
            z-index: 999;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
        }

        .mobile-topbar .logo-text {
            font-size: 18px;
            font-weight: 700;
            color: #fff;
        }

        .mobile-topbar .logo-text span {
            color: var(--accent);
        }

        .mobile-toggle {
            background: none;
            color: #fff;
            font-size: 24px;
            padding: 4px 8px;
            cursor: pointer;
            border-radius: 4px;
            transition: background var(--transition);
        }

        .mobile-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
        }

        /* ========== 遮罩 ========== */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 999;
            opacity: 0;
            transition: opacity var(--transition);
        }

        .sidebar-overlay.open {
            opacity: 1;
        }

        /* ========== Container ========== */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* ========== Page Header (内页横幅) ========== */
        .page-header {
            position: relative;
            padding: 60px 0 50px;
            background: var(--primary-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            color: var(--text-white);
            overflow: hidden;
        }

        .page-header::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 26, 46, 0.88) 0%, rgba(26, 58, 107, 0.70) 100%);
            z-index: 1;
        }

        .page-header .container {
            position: relative;
            z-index: 2;
        }

        .page-header h1 {
            font-size: 36px;
            font-weight: 700;
            letter-spacing: -0.5px;
            margin-bottom: 12px;
        }

        .page-header p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 620px;
            line-height: 1.7;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 16px;
        }

        .breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
            transition: color var(--transition);
        }

        .breadcrumb a:hover {
            color: var(--accent);
        }

        .breadcrumb span {
            color: var(--accent);
        }

        .breadcrumb i {
            font-size: 10px;
            color: rgba(255, 255, 255, 0.3);
        }

        /* ========== 板块通用 ========== */
        .section {
            padding: 60px 0;
        }

        .section-title {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 8px;
            letter-spacing: -0.3px;
        }

        .section-subtitle {
            font-size: 16px;
            color: var(--text-secondary);
            margin-bottom: 32px;
            max-width: 600px;
        }

        .text-center {
            text-align: center;
        }

        .section-title-center {
            text-align: center;
        }

        .section-title-center .section-title {
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        .section-title-center .section-subtitle {
            margin-left: auto;
            margin-right: auto;
        }

        /* ========== 入口卡片网格 ========== */
        .entry-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .entry-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 24px 28px;
            border: 1px solid var(--border-card);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .entry-card::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--primary);
            transition: height var(--transition);
        }

        .entry-card:hover::after {
            height: 6px;
            background: var(--accent);
        }

        .entry-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--accent-light);
        }

        .entry-card .icon-box {
            width: 64px;
            height: 64px;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            font-size: 28px;
            color: #fff;
            transition: transform var(--transition);
        }

        .entry-card:hover .icon-box {
            transform: scale(1.06);
        }

        .entry-card h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .entry-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        .entry-card .entry-tag {
            display: inline-block;
            margin-top: 14px;
            font-size: 12px;
            font-weight: 600;
            color: var(--primary);
            background: rgba(26, 58, 107, 0.08);
            padding: 4px 14px;
            border-radius: var(--radius-full);
            transition: all var(--transition);
        }

        .entry-card:hover .entry-tag {
            background: var(--accent);
            color: var(--text-on-accent);
        }

        /* ========== 访问步骤 ========== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .step-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 28px 20px 24px;
            border: 1px solid var(--border-card);
            box-shadow: var(--shadow-sm);
            text-align: center;
            position: relative;
            transition: all var(--transition);
        }

        .step-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }

        .step-number {
            width: 44px;
            height: 44px;
            background: var(--accent);
            color: var(--text-on-accent);
            font-weight: 700;
            font-size: 18px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
        }

        .step-card h4 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .step-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ========== 入口列表 ========== */
        .access-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }

        .access-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            padding: 20px 24px;
            border: 1px solid var(--border-card);
            display: flex;
            align-items: center;
            gap: 16px;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }

        .access-item:hover {
            border-color: var(--accent-light);
            box-shadow: var(--shadow-md);
            transform: translateX(3px);
        }

        .access-item .access-icon {
            width: 44px;
            height: 44px;
            background: rgba(26, 58, 107, 0.08);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--primary);
            flex-shrink: 0;
        }

        .access-item .access-info h4 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 2px;
        }

        .access-item .access-info span {
            font-size: 13px;
            color: var(--text-light);
        }

        .access-item .access-badge {
            margin-left: auto;
            font-size: 11px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: var(--radius-full);
            background: rgba(230, 168, 0, 0.12);
            color: var(--accent-dark);
            flex-shrink: 0;
        }

        .access-item .access-badge.off {
            background: rgba(100, 116, 139, 0.10);
            color: var(--text-light);
        }

        /* ========== 安全提示 ========== */
        .security-box {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            border-radius: var(--radius-lg);
            padding: 40px 48px;
            color: var(--text-white);
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            align-items: center;
        }

        .security-box h3 {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .security-box p {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.85);
            line-height: 1.8;
        }

        .security-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .security-list li {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 15px;
            color: rgba(255, 255, 255, 0.9);
        }

        .security-list li i {
            color: var(--accent);
            font-size: 16px;
            width: 20px;
        }

        /* ========== FAQ ========== */
        .faq-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }

        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            padding: 20px 24px;
            border: 1px solid var(--border-card);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            cursor: pointer;
        }

        .faq-item:hover {
            border-color: var(--accent-light);
            box-shadow: var(--shadow-md);
        }

        .faq-item .faq-q {
            font-weight: 600;
            font-size: 15px;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 6px;
        }

        .faq-item .faq-q i {
            color: var(--accent);
            font-size: 14px;
        }

        .faq-item .faq-a {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            padding-left: 24px;
        }

        /* ========== CTA ========== */
        .cta-section {
            background: var(--bg-sidebar);
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            padding: 64px 0;
            text-align: center;
            color: var(--text-white);
            position: relative;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(15, 26, 46, 0.82);
            z-index: 1;
        }

        .cta-section .container {
            position: relative;
            z-index: 2;
        }

        .cta-section h2 {
            font-size: 32px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .cta-section p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 560px;
            margin: 0 auto 28px;
        }

        .btn-group {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 15px;
            transition: all var(--transition);
            cursor: pointer;
            border: 2px solid transparent;
            background: var(--accent);
            color: var(--text-on-accent);
        }

        .btn:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(230, 168, 0, 0.35);
        }

        .btn-outline {
            background: transparent;
            border-color: rgba(255, 255, 255, 0.4);
            color: #fff;
        }

        .btn-outline:hover {
            border-color: var(--accent);
            background: rgba(230, 168, 0, 0.12);
            color: var(--accent);
            box-shadow: none;
        }

        .btn-light {
            background: var(--bg-white);
            color: var(--primary);
        }

        .btn-light:hover {
            background: var(--accent-light);
            color: var(--text-on-accent);
            box-shadow: 0 8px 24px rgba(230, 168, 0, 0.30);
        }

        .btn-sm {
            padding: 10px 20px;
            font-size: 13px;
        }

        /* ========== Footer ========== */
        .site-footer {
            background: var(--bg-sidebar);
            color: rgba(255, 255, 255, 0.8);
            padding: 48px 0 0;
            margin-top: auto;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 32px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .footer-brand .footer-logo {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }

        .footer-brand .footer-logo span {
            color: var(--accent);
        }

        .footer-brand p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.7;
            max-width: 300px;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }

        .footer-col ul li {
            margin-bottom: 10px;
        }

        .footer-col ul li a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            transition: all var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .footer-col ul li a i {
            font-size: 10px;
            color: rgba(255, 255, 255, 0.25);
            transition: color var(--transition);
        }

        .footer-col ul li a:hover {
            color: var(--accent);
        }

        .footer-col ul li a:hover i {
            color: var(--accent);
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 0;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }

        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
            transition: color var(--transition);
        }

        .footer-bottom a:hover {
            color: var(--accent);
        }

        /* ========== 响应式断点 ========== */
        @media (max-width: 1024px) {
            .entry-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .security-box {
                grid-template-columns: 1fr;
                padding: 32px 28px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }

            .sidebar.open {
                transform: translateX(0);
            }

            .sidebar-overlay.open {
                display: block;
            }

            .mobile-topbar {
                display: flex;
            }

            .main-content {
                margin-left: 0;
                width: 100%;
            }

            .page-header {
                padding: 40px 0 32px;
            }

            .page-header h1 {
                font-size: 26px;
            }

            .page-header p {
                font-size: 15px;
            }

            .section {
                padding: 40px 0;
            }

            .section-title {
                font-size: 22px;
            }

            .entry-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }

            .entry-card {
                padding: 24px 16px 20px;
            }

            .steps-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }

            .access-list {
                grid-template-columns: 1fr;
            }

            .faq-grid {
                grid-template-columns: 1fr;
            }

            .security-box {
                padding: 28px 20px;
            }

            .cta-section h2 {
                font-size: 24px;
            }

            .btn-group {
                flex-direction: column;
                align-items: center;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .footer-bottom {
                flex-direction: column;
                gap: 8px;
                text-align: center;
            }

            .container {
                padding: 0 16px;
            }
        }

        @media (max-width: 520px) {
            .entry-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .page-header h1 {
                font-size: 22px;
            }
            .section-title {
                font-size: 20px;
            }
            .btn {
                width: 100%;
                justify-content: center;
            }
            .access-item {
                flex-wrap: wrap;
                padding: 16px 18px;
            }
            .access-item .access-badge {
                margin-left: 60px;
            }
        }

        /* ========== 辅助类 ========== */
        .mb-8 {
            margin-bottom: 8px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }
        .mb-32 {
            margin-bottom: 32px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .gap-8 {
            gap: 8px;
        }
        .gap-16 {
            gap: 16px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .text-accent {
            color: var(--accent);
        }
        .text-light {
            color: var(--text-light);
        }
        .bg-white {
            background: var(--bg-white);
        }
        .rounded-md {
            border-radius: var(--radius-md);
        }
        .shadow-sm {
            box-shadow: var(--shadow-sm);
        }

        /* 滚动条美化 */
        .sidebar::-webkit-scrollbar {
            width: 4px;
        }
        .sidebar::-webkit-scrollbar-track {
            background: transparent;
        }
        .sidebar::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.15);
            border-radius: 4px;
        }

/* roulang page: category2 */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a2a6c;
            --primary-light: #2d4a8e;
            --primary-dark: #0f1a47;
            --accent: #e94560;
            --accent-light: #ff6b81;
            --accent-dark: #c2304a;
            --bg-dark: #0b0f1c;
            --bg-card: #131a2e;
            --bg-section: #0f1525;
            --bg-light: #f0f2f8;
            --text-light: #f0f2f8;
            --text-muted: #8892b0;
            --text-dark: #1a1a2e;
            --border-color: rgba(233, 69, 96, 0.15);
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
            --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --sidebar-width: 260px;
            --header-height: 0px;
        }

        /* ===== Reset ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            background: var(--bg-dark);
            color: var(--text-light);
            display: flex;
            min-height: 100vh;
            overflow-x: hidden;
        }

        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent-light);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            outline: none;
            border: none;
        }

        ul,
        ol {
            list-style: none;
        }

        /* ===== Container ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Sidebar Navigation ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-card);
            border-right: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform var(--transition);
            overflow-y: auto;
        }

        .sidebar-brand {
            padding: 28px 20px 20px;
            border-bottom: 1px solid var(--border-color);
            text-align: center;
        }

        .sidebar-brand .logo {
            font-size: 22px;
            font-weight: 800;
            color: var(--text-light);
            letter-spacing: 1px;
        }
        .sidebar-brand .logo span {
            color: var(--accent);
        }
        .sidebar-brand .logo-sub {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 4px;
            letter-spacing: 2px;
        }

        .sidebar-nav {
            flex: 1;
            padding: 16px 12px;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .nav-label {
            font-size: 11px;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: var(--text-muted);
            padding: 12px 12px 8px;
            font-weight: 600;
        }

        .sidebar-nav .nav-item {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: var(--text-muted);
            font-size: 15px;
            font-weight: 500;
            transition: all var(--transition);
            position: relative;
        }
        .sidebar-nav .nav-item i {
            width: 20px;
            text-align: center;
            font-size: 16px;
        }
        .sidebar-nav .nav-item:hover {
            color: var(--text-light);
            background: rgba(233, 69, 96, 0.08);
        }
        .sidebar-nav .nav-item.active {
            color: var(--text-light);
            background: rgba(233, 69, 96, 0.15);
            box-shadow: inset 3px 0 0 var(--accent);
        }
        .sidebar-nav .nav-item.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 24px;
            background: var(--accent);
            border-radius: 0 4px 4px 0;
        }

        /* ===== Mobile Menu Toggle ===== */
        .menu-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            background: var(--bg-card);
            color: var(--text-light);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            padding: 10px 14px;
            font-size: 20px;
            cursor: pointer;
            transition: background var(--transition);
        }
        .menu-toggle:hover {
            background: var(--primary-light);
        }

        .sidebar-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            background: rgba(0, 0, 0, 0.6);
            z-index: 999;
            backdrop-filter: blur(4px);
        }

        /* ===== Main Content ===== */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== Hero / Banner ===== */
        .page-hero {
            position: relative;
            padding: 100px 0 80px;
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--bg-dark) 60%, #0f1525 100%);
            overflow: hidden;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.15;
            z-index: 0;
        }
        .page-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 26, 71, 0.85) 0%, rgba(11, 15, 28, 0.7) 100%);
            z-index: 1;
        }
        .page-hero .container {
            position: relative;
            z-index: 2;
        }
        .page-hero .hero-badge {
            display: inline-block;
            background: rgba(233, 69, 96, 0.2);
            color: var(--accent-light);
            padding: 6px 18px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 1px;
            margin-bottom: 16px;
            border: 1px solid rgba(233, 69, 96, 0.25);
        }
        .page-hero h1 {
            font-size: 44px;
            font-weight: 800;
            line-height: 1.2;
            color: var(--text-light);
            margin-bottom: 16px;
            max-width: 700px;
        }
        .page-hero h1 span {
            color: var(--accent);
        }
        .page-hero p {
            font-size: 18px;
            color: var(--text-muted);
            max-width: 600px;
            line-height: 1.8;
            margin-bottom: 28px;
        }
        .page-hero .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 15px;
            cursor: pointer;
            transition: all var(--transition);
            border: none;
            text-decoration: none;
            line-height: 1;
        }
        .btn-primary {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 20px rgba(233, 69, 96, 0.35);
        }
        .btn-primary:hover {
            background: var(--accent-light);
            box-shadow: 0 6px 30px rgba(233, 69, 96, 0.5);
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-secondary {
            background: transparent;
            color: var(--text-light);
            border: 1px solid rgba(255, 255, 255, 0.2);
        }
        .btn-secondary:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 10px 22px;
            font-size: 13px;
        }
        .btn:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 4px;
        }

        /* ===== Section Common ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-section);
        }
        .section-dark {
            background: var(--bg-dark);
        }
        .section-header {
            text-align: center;
            margin-bottom: 52px;
        }
        .section-header h2 {
            font-size: 34px;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 12px;
        }
        .section-header h2 span {
            color: var(--accent);
        }
        .section-header p {
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto;
            font-size: 16px;
        }
        .section-header .section-tag {
            display: inline-block;
            background: rgba(233, 69, 96, 0.12);
            color: var(--accent-light);
            padding: 4px 16px;
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 1px;
            margin-bottom: 12px;
            border: 1px solid rgba(233, 69, 96, 0.15);
        }

        /* ===== Cards Grid ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-color);
            transition: all var(--transition);
        }
        .card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: rgba(233, 69, 96, 0.3);
        }
        .card-image {
            width: 100%;
            height: 200px;
            overflow: hidden;
            position: relative;
        }
        .card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .card:hover .card-image img {
            transform: scale(1.05);
        }
        .card-image .card-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--accent);
            color: #fff;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
            z-index: 2;
        }
        .card-body {
            padding: 24px;
        }
        .card-body h3 {
            font-size: 19px;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 8px;
            line-height: 1.3;
        }
        .card-body p {
            color: var(--text-muted);
            font-size: 14px;
            line-height: 1.7;
            margin-bottom: 16px;
        }
        .card-body .card-link {
            color: var(--accent);
            font-weight: 600;
            font-size: 14px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: gap var(--transition);
        }
        .card-body .card-link:hover {
            gap: 12px;
            color: var(--accent-light);
        }

        /* ===== Badge / Tag ===== */
        .badge {
            display: inline-block;
            background: rgba(233, 69, 96, 0.12);
            color: var(--accent-light);
            padding: 3px 12px;
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
            border: 1px solid rgba(233, 69, 96, 0.15);
        }
        .badge-sm {
            padding: 2px 10px;
            font-size: 11px;
        }

        /* ===== Icon Feature List ===== */
        .feature-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
            margin-top: 20px;
        }
        .feature-item {
            display: flex;
            gap: 16px;
            align-items: flex-start;
            background: var(--bg-card);
            padding: 20px 24px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
        }
        .feature-item:hover {
            border-color: rgba(233, 69, 96, 0.25);
            transform: translateX(4px);
        }
        .feature-item .fi-icon {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: rgba(233, 69, 96, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--accent);
            flex-shrink: 0;
        }
        .feature-item .fi-content h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-light);
            margin-bottom: 4px;
        }
        .feature-item .fi-content p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ===== Step / Process ===== */
        .step-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            counter-reset: step-counter;
        }
        .step-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            border: 1px solid var(--border-color);
            text-align: center;
            transition: all var(--transition);
            position: relative;
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .step-card .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--accent);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 700;
            margin: 0 auto 16px;
        }
        .step-card h4 {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-light);
            margin-bottom: 8px;
        }
        .step-card p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.7;
        }

        /* ===== Stats ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .stat-item {
            text-align: center;
            background: var(--bg-card);
            padding: 32px 16px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
        }
        .stat-item:hover {
            border-color: rgba(233, 69, 96, 0.3);
            transform: translateY(-2px);
        }
        .stat-item .stat-number {
            font-size: 36px;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
        }
        .stat-item .stat-number span {
            font-size: 18px;
            color: var(--text-muted);
        }
        .stat-item .stat-label {
            font-size: 14px;
            color: var(--text-muted);
            margin-top: 8px;
            font-weight: 500;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(233, 69, 96, 0.2);
        }
        .faq-question {
            padding: 18px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            color: var(--text-light);
            font-size: 16px;
            transition: background var(--transition);
            user-select: none;
        }
        .faq-question:hover {
            background: rgba(233, 69, 96, 0.04);
        }
        .faq-question i {
            color: var(--accent);
            transition: transform var(--transition);
            font-size: 14px;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: all var(--transition);
            color: var(--text-muted);
            font-size: 14px;
            line-height: 1.8;
        }
        .faq-item.active .faq-answer {
            padding: 0 24px 18px;
            max-height: 400px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--bg-dark) 100%);
            position: relative;
            overflow: hidden;
            padding: 80px 0;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 34px;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 12px;
        }
        .cta-section h2 span {
            color: var(--accent);
        }
        .cta-section p {
            color: var(--text-muted);
            font-size: 16px;
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-section .cta-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-card);
            border-top: 1px solid var(--border-color);
            padding: 60px 0 30px;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .footer-logo {
            font-size: 22px;
            font-weight: 800;
            color: var(--text-light);
            margin-bottom: 12px;
        }
        .footer-brand .footer-logo span {
            color: var(--accent);
        }
        .footer-brand p {
            color: var(--text-muted);
            font-size: 14px;
            line-height: 1.8;
            max-width: 300px;
        }
        .footer-col h4 {
            color: var(--text-light);
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: var(--text-muted);
            font-size: 14px;
            display: flex;
            align-items: center;
            gap: 8px;
            transition: all var(--transition);
        }
        .footer-col ul li a i {
            font-size: 10px;
            color: var(--accent);
        }
        .footer-col ul li a:hover {
            color: var(--text-light);
            transform: translateX(4px);
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            border-top: 1px solid var(--border-color);
            font-size: 13px;
            color: var(--text-muted);
        }
        .footer-bottom a {
            color: var(--text-muted);
            transition: color var(--transition);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .step-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .sidebar-overlay.active {
                display: block;
            }
            .menu-toggle {
                display: block;
            }
            .main-content {
                margin-left: 0;
                padding-top: 60px;
            }
            .page-hero {
                padding: 60px 0 50px;
            }
            .page-hero h1 {
                font-size: 30px;
            }
            .page-hero p {
                font-size: 15px;
            }
            .section {
                padding: 50px 0;
            }
            .section-header h2 {
                font-size: 26px;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .feature-list {
                grid-template-columns: 1fr;
            }
            .step-grid {
                grid-template-columns: 1fr 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                gap: 12px;
                text-align: center;
            }
            .stat-item .stat-number {
                font-size: 28px;
            }
            .container {
                padding: 0 16px;
            }
            .cta-section h2 {
                font-size: 26px;
            }
        }

        @media (max-width: 520px) {
            .page-hero h1 {
                font-size: 24px;
            }
            .hero-actions {
                flex-direction: column;
            }
            .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }
            .step-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .section-header h2 {
                font-size: 22px;
            }
            .card-body h3 {
                font-size: 17px;
            }
            .faq-question {
                font-size: 14px;
                padding: 14px 16px;
            }
            .faq-answer {
                font-size: 13px;
            }
            .sidebar-brand .logo {
                font-size: 18px;
            }
        }

        /* ===== Accessibility ===== */
        :focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        /* ===== Scrollbar ===== */
        .sidebar::-webkit-scrollbar {
            width: 4px;
        }
        .sidebar::-webkit-scrollbar-track {
            background: transparent;
        }
        .sidebar::-webkit-scrollbar-thumb {
            background: var(--border-color);
            border-radius: 4px;
        }

        /* ===== Additional Decorative ===== */
        .gradient-line {
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--accent), var(--accent-light));
            border-radius: 4px;
            margin: 12px auto 0;
        }
        .gradient-line-left {
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--accent), var(--accent-light));
            border-radius: 4px;
            margin: 12px 0 0;
        }

        .text-accent {
            color: var(--accent);
        }
        .text-muted {
            color: var(--text-muted);
        }
        .mb-8 {
            margin-bottom: 8px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }
        .mb-32 {
            margin-bottom: 32px;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .text-center {
            text-align: center;
        }

        /* Breadcrumb */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 16px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-muted);
            transition: color var(--transition);
        }
        .breadcrumb a:hover {
            color: var(--accent);
        }
        .breadcrumb span {
            color: var(--text-muted);
        }
        .breadcrumb i {
            font-size: 10px;
            color: var(--text-muted);
        }

        /* Two column layout for content */
        .two-col {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .two-col .col-image {
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-md);
        }
        .two-col .col-image img {
            width: 100%;
            height: 400px;
            object-fit: cover;
        }
        .two-col .col-content h2 {
            font-size: 30px;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 12px;
        }
        .two-col .col-content h2 span {
            color: var(--accent);
        }
        .two-col .col-content p {
            color: var(--text-muted);
            font-size: 15px;
            line-height: 1.8;
            margin-bottom: 16px;
        }

        @media (max-width: 768px) {
            .two-col {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .two-col .col-image img {
                height: 240px;
            }
            .two-col .col-content h2 {
                font-size: 24px;
            }
        }

        /* Tips list */
        .tips-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .tips-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 14px 18px;
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
            color: var(--text-muted);
            font-size: 14px;
            transition: all var(--transition);
        }
        .tips-list li:hover {
            border-color: rgba(233, 69, 96, 0.2);
            transform: translateX(4px);
        }
        .tips-list li i {
            color: var(--accent);
            margin-top: 3px;
            font-size: 14px;
            flex-shrink: 0;
        }
        .tips-list li strong {
            color: var(--text-light);
        }