/* roulang page: index */
/* ===== 设计变量 ===== */
:root {
  --primary: #1e3a5f;
  --primary-light: #2a5080;
  --primary-dark: #142840;
  --primary-rgb: 30, 58, 95;
  --secondary: #f59e0b;
  --secondary-light: #fbbf24;
  --secondary-dark: #d97706;
  --accent: #e11d48;
  --accent-light: #fb7185;
  --bg: #f8fafc;
  --bg-dark: #0f172a;
  --bg-card: #ffffff;
  --bg-section: #f1f5f9;
  --text: #1e293b;
  --text-light: #64748b;
  --text-lighter: #94a3b8;
  --text-white: #ffffff;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: 0.3s ease;
  --transition-fast: 0.15s ease;
  --max-width: 1200px;
  --header-height: 80px;
  --topbar-height: 40px;
  --font: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3.5rem;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;
}

/* ===== 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);
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-light); }
a:focus-visible { outline: 2px solid var(--secondary); outline-offset: 2px; border-radius: 4px; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
button:focus-visible { outline: 2px solid var(--secondary); outline-offset: 2px; }
input, textarea, select { font-family: inherit; font-size: inherit; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.3; color: var(--primary-dark); font-weight: 700; }
h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
p { margin-bottom: var(--spacing-md); }
p:last-child { margin-bottom: 0; }

/* ===== Container ===== */
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 var(--spacing-xl); }
@media (max-width: 768px) { .container { padding: 0 var(--spacing-lg); } }
@media (max-width: 520px) { .container { padding: 0 var(--spacing-md); } }

/* ===== Utility ===== */
.section-padding { padding: var(--spacing-4xl) 0; }
.section-padding-sm { padding: var(--spacing-3xl) 0; }
.text-center { text-align: center; }
.text-white { color: var(--text-white); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
.section-label {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--secondary);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: var(--spacing-sm);
}
.section-title {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-md);
  color: var(--primary-dark);
}
.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-light);
  max-width: 640px;
  margin: 0 auto var(--spacing-2xl);
  line-height: 1.6;
}
.section-divider {
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--secondary), var(--accent));
  border-radius: 4px;
  margin: var(--spacing-sm) auto var(--spacing-lg);
}

/* ===== Top Bar ===== */
.topbar {
  background: var(--primary-dark);
  color: var(--text-lighter);
  font-size: var(--font-size-xs);
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.topbar .container { display: flex; justify-content: space-between; align-items: center; }
.topbar-left { display: flex; align-items: center; gap: var(--spacing-lg); }
.topbar-left i { margin-right: var(--spacing-xs); color: var(--secondary); }
.topbar-left span { color: var(--text-lighter); }
.topbar-right { display: flex; align-items: center; gap: var(--spacing-md); }
.topbar-right a { color: var(--text-lighter); transition: color var(--transition); font-size: var(--font-size-xs); }
.topbar-right a:hover { color: var(--secondary); }
.topbar-right .topbar-cta {
  background: var(--secondary);
  color: var(--primary-dark);
  padding: 2px 14px;
  border-radius: 20px;
  font-weight: 600;
  font-size: var(--font-size-xs);
  transition: background var(--transition), color var(--transition);
}
.topbar-right .topbar-cta:hover { background: var(--secondary-light); color: var(--primary-dark); }
@media (max-width: 768px) { .topbar-left span { display: none; } .topbar-right .topbar-cta { padding: 2px 10px; } }
@media (max-width: 520px) { .topbar { font-size: 10px; } .topbar-right a { font-size: 10px; } }

/* ===== Header / Nav ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-card);
  box-shadow: var(--shadow-sm);
  height: var(--header-height);
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}
.header.scrolled { box-shadow: var(--shadow); }
.header .container { display: flex; justify-content: space-between; align-items: center; }
.logo { display: flex; align-items: center; gap: var(--spacing-sm); }
.logo-icon {
  width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-white); font-size: 1.2rem; font-weight: 700;
  flex-shrink: 0;
}
.logo-text {
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--primary-dark);
  letter-spacing: -0.5px;
  line-height: 1.2;
}
.logo-text span { color: var(--secondary); }
.nav { display: flex; align-items: center; gap: var(--spacing-xl); }
.nav a {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text);
  padding: var(--spacing-xs) 0;
  position: relative;
  transition: color var(--transition);
}
.nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--secondary);
  transition: width var(--transition);
  border-radius: 2px;
}
.nav a:hover { color: var(--primary); }
.nav a:hover::after { width: 100%; }
.nav a.active { color: var(--primary); font-weight: 600; }
.nav a.active::after { width: 100%; }
.nav-cta {
  background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
  color: var(--text-white) !important;
  padding: 8px 24px !important;
  border-radius: 50px;
  font-weight: 600 !important;
  font-size: var(--font-size-sm) !important;
  transition: transform var(--transition), box-shadow var(--transition) !important;
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3);
}
.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(245, 158, 11, 0.4);
  color: var(--text-white) !important;
}
.nav-cta::after { display: none !important; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; }
.nav-toggle span { display: block; width: 26px; height: 2px; background: var(--primary-dark); border-radius: 2px; transition: var(--transition); }
.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }
@media (max-width: 900px) {
  .nav-toggle { display: flex; }
  .nav {
    position: fixed;
    top: calc(var(--header-height) + var(--topbar-height));
    left: 0;
    right: 0;
    background: var(--bg-card);
    flex-direction: column;
    padding: var(--spacing-xl);
    gap: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    transform: translateY(-120%);
    transition: transform 0.4s ease;
    border-bottom: 2px solid var(--border);
    z-index: 999;
  }
  .nav.open { transform: translateY(0); }
  .nav a { font-size: var(--font-size-base); padding: var(--spacing-sm) 0; width: 100%; text-align: center; }
  .nav a::after { bottom: 2px; }
  .nav-cta { width: 100%; text-align: center !important; padding: 12px !important; }
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-dark);
  background-image: url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
  background-blend-mode: overlay;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15,23,42,0.85) 0%, rgba(30,58,95,0.7) 50%, rgba(15,23,42,0.6) 100%);
  z-index: 1;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 120px;
  background: linear-gradient(to top, var(--bg), transparent);
  z-index: 2;
}
.hero .container { position: relative; z-index: 3; text-align: center; }
.hero-badge {
  display: inline-block;
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid rgba(245, 158, 11, 0.3);
  color: var(--secondary-light);
  padding: 6px 20px;
  border-radius: 50px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  margin-bottom: var(--spacing-lg);
  backdrop-filter: blur(10px);
}
.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: 800;
  color: var(--text-white);
  line-height: 1.15;
  margin-bottom: var(--spacing-lg);
  text-shadow: 0 2px 20px rgba(0,0,0,0.3);
}
.hero-title span { background: linear-gradient(135deg, var(--secondary), var(--accent-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-desc {
  font-size: var(--font-size-lg);
  color: rgba(255,255,255,0.75);
  max-width: 640px;
  margin: 0 auto var(--spacing-2xl);
  line-height: 1.7;
}
.hero-actions { display: flex; gap: var(--spacing-md); justify-content: center; flex-wrap: wrap; }
.hero-actions .btn-primary {
  background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
  color: var(--text-white);
  padding: 16px 40px;
  border-radius: 50px;
  font-size: var(--font-size-base);
  font-weight: 600;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 8px 30px rgba(245, 158, 11, 0.35);
  display: inline-flex; align-items: center; gap: var(--spacing-sm);
}
.hero-actions .btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 40px rgba(245, 158, 11, 0.45); color: var(--text-white); }
.hero-actions .btn-secondary {
  background: rgba(255,255,255,0.1);
  color: var(--text-white);
  padding: 16px 36px;
  border-radius: 50px;
  font-size: var(--font-size-base);
  font-weight: 500;
  border: 1px solid rgba(255,255,255,0.2);
  transition: background var(--transition), border-color var(--transition);
  display: inline-flex; align-items: center; gap: var(--spacing-sm);
  backdrop-filter: blur(10px);
}
.hero-actions .btn-secondary:hover { background: rgba(255,255,255,0.2); border-color: rgba(255,255,255,0.3); color: var(--text-white); }
.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--spacing-3xl);
  margin-top: var(--spacing-3xl);
  padding-top: var(--spacing-2xl);
  border-top: 1px solid rgba(255,255,255,0.1);
}
.hero-stat-item { text-align: center; }
.hero-stat-number { font-size: var(--font-size-3xl); font-weight: 800; color: var(--text-white); }
.hero-stat-label { font-size: var(--font-size-sm); color: rgba(255,255,255,0.6); margin-top: var(--spacing-xs); }
@media (max-width: 1024px) { .hero-title { font-size: var(--font-size-4xl); } .hero { min-height: 70vh; } }
@media (max-width: 768px) {
  .hero { min-height: 65vh; }
  .hero-title { font-size: var(--font-size-3xl); }
  .hero-desc { font-size: var(--font-size-base); }
  .hero-stats { gap: var(--spacing-xl); flex-wrap: wrap; }
  .hero-stat-number { font-size: var(--font-size-2xl); }
}
@media (max-width: 520px) {
  .hero-title { font-size: var(--font-size-2xl); }
  .hero-actions .btn-primary, .hero-actions .btn-secondary { padding: 14px 28px; font-size: var(--font-size-sm); width: 100%; justify-content: center; }
  .hero-stats { flex-direction: column; gap: var(--spacing-lg); }
}

/* ===== Intro Section ===== */
.intro-section { background: var(--bg-card); }
.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}
.intro-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  position: relative;
}
.intro-image img { width: 100%; height: 100%; object-fit: cover; min-height: 360px; transition: transform 0.6s ease; }
.intro-image:hover img { transform: scale(1.03); }
.intro-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(30,58,95,0.2), transparent);
  pointer-events: none;
}
.intro-content .section-title { margin-bottom: var(--spacing-lg); }
.intro-content p { color: var(--text-light); font-size: var(--font-size-base); line-height: 1.8; margin-bottom: var(--spacing-md); }
.intro-features { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-md); margin-top: var(--spacing-lg); }
.intro-feature { display: flex; align-items: flex-start; gap: var(--spacing-sm); }
.intro-feature i { color: var(--secondary); font-size: var(--font-size-lg); margin-top: 2px; flex-shrink: 0; }
.intro-feature span { font-size: var(--font-size-sm); color: var(--text); font-weight: 500; }
@media (max-width: 900px) {
  .intro-grid { grid-template-columns: 1fr; gap: var(--spacing-2xl); }
  .intro-image { order: -1; }
  .intro-image img { min-height: 260px; }
}
@media (max-width: 520px) {
  .intro-features { grid-template-columns: 1fr; }
  .intro-image img { min-height: 200px; }
}

/* ===== Categories Section ===== */
.categories-section { background: var(--bg-section); }
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
}
.category-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid var(--border);
}
.category-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.category-card-img {
  height: 200px;
  overflow: hidden;
  position: relative;
}
.category-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.category-card:hover .category-card-img img { transform: scale(1.05); }
.category-card-img .cat-overlay {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  padding: var(--spacing-lg);
  background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
}
.category-card-img .cat-overlay .cat-tag {
  display: inline-block;
  background: var(--secondary);
  color: var(--primary-dark);
  padding: 3px 14px;
  border-radius: 20px;
  font-size: var(--font-size-xs);
  font-weight: 600;
}
.category-card-body { padding: var(--spacing-lg); }
.category-card-body h3 { font-size: var(--font-size-lg); margin-bottom: var(--spacing-sm); }
.category-card-body p { font-size: var(--font-size-sm); color: var(--text-light); line-height: 1.6; margin-bottom: var(--spacing-md); }
.category-card-body .card-link {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--secondary-dark);
  display: inline-flex; align-items: center; gap: var(--spacing-xs);
  transition: gap var(--transition);
}
.category-card-body .card-link:hover { gap: var(--spacing-sm); color: var(--secondary-dark); }

/* ===== News / CMS Section ===== */
.news-section { background: var(--bg-card); }
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--spacing-xl);
}
.news-card {
  background: var(--bg-section);
  border-radius: var(--radius);
  padding: var(--spacing-xl);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
}
.news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.news-card .news-category {
  display: inline-block;
  background: var(--primary);
  color: var(--text-white);
  padding: 2px 12px;
  border-radius: 20px;
  font-size: var(--font-size-xs);
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
}
.news-card h4 { font-size: var(--font-size-base); margin-bottom: var(--spacing-sm); transition: color var(--transition); }
.news-card:hover h4 { color: var(--primary); }
.news-card .news-excerpt {
  font-size: var(--font-size-sm);
  color: var(--text-light);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.news-card .news-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-size-xs);
  color: var(--text-lighter);
  border-top: 1px solid var(--border);
  padding-top: var(--spacing-md);
  margin-top: auto;
}
.news-card .news-meta i { margin-right: var(--spacing-xs); }
.news-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--spacing-3xl);
  color: var(--text-light);
  font-size: var(--font-size-lg);
  background: var(--bg-section);
  border-radius: var(--radius);
  border: 1px dashed var(--border);
}
.news-empty i { font-size: 2rem; color: var(--text-lighter); margin-bottom: var(--spacing-md); display: block; }
@media (max-width: 768px) { .news-grid { grid-template-columns: 1fr; } }
@media (max-width: 520px) { .news-card { padding: var(--spacing-lg); } }

/* ===== Features / Data Section ===== */
.features-section {
  background: var(--bg-dark);
  color: var(--text-white);
  position: relative;
  overflow: hidden;
}
.features-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('/assets/images/backpic/back-2.png') center/cover;
  opacity: 0.08;
  pointer-events: none;
}
.features-section .section-title { color: var(--text-white); }
.features-section .section-subtitle { color: rgba(255,255,255,0.7); }
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
  position: relative;
  z-index: 1;
}
.feature-item {
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-lg);
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.08);
  transition: background var(--transition), transform var(--transition);
}
.feature-item:hover { background: rgba(255,255,255,0.1); transform: translateY(-4px); }
.feature-item i { font-size: 2.5rem; color: var(--secondary); margin-bottom: var(--spacing-md); }
.feature-item .number { font-size: var(--font-size-4xl); font-weight: 800; color: var(--text-white); line-height: 1.2; }
.feature-item .label { font-size: var(--font-size-sm); color: rgba(255,255,255,0.6); margin-top: var(--spacing-xs); }
@media (max-width: 900px) { .features-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .features-grid { grid-template-columns: 1fr; } .feature-item { padding: var(--spacing-xl) var(--spacing-md); } }

/* ===== Process Section ===== */
.process-section { background: var(--bg-card); }
.process-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-xl);
  position: relative;
}
.process-steps::before {
  content: '';
  position: absolute;
  top: 40px; left: 10%; right: 10%;
  height: 2px;
  background: linear-gradient(90deg, var(--secondary), var(--accent), var(--secondary));
  z-index: 0;
}
.process-step {
  text-align: center;
  position: relative;
  z-index: 1;
}
.process-step .step-num {
  width: 80px; height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto var(--spacing-lg);
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--text-white);
  box-shadow: 0 8px 25px rgba(30,58,95,0.3);
  border: 3px solid var(--bg-card);
  position: relative;
}
.process-step .step-num::after {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 2px dashed var(--secondary);
  opacity: 0.4;
  animation: spin 20s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.process-step:nth-child(2) .step-num { background: linear-gradient(135deg, var(--secondary), var(--secondary-dark)); box-shadow: 0 8px 25px rgba(245,158,11,0.3); }
.process-step:nth-child(3) .step-num { background: linear-gradient(135deg, var(--accent), var(--accent-light)); box-shadow: 0 8px 25px rgba(225,29,72,0.3); }
.process-step:nth-child(4) .step-num { background: linear-gradient(135deg, var(--primary-light), var(--primary)); box-shadow: 0 8px 25px rgba(42,80,128,0.3); }
.process-step h4 { font-size: var(--font-size-base); margin-bottom: var(--spacing-sm); }
.process-step p { font-size: var(--font-size-sm); color: var(--text-light); line-height: 1.6; }
@media (max-width: 900px) { .process-steps { grid-template-columns: repeat(2, 1fr); } .process-steps::before { display: none; } }
@media (max-width: 520px) { .process-steps { grid-template-columns: 1fr; } .process-step .step-num { width: 64px; height: 64px; font-size: var(--font-size-xl); } }

/* ===== FAQ Section ===== */
.faq-section { background: var(--bg-section); }
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: var(--spacing-md); }
.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: box-shadow var(--transition);
}
.faq-item:hover { box-shadow: var(--shadow-sm); }
.faq-question {
  padding: var(--spacing-lg) var(--spacing-xl);
  display: flex; justify-content: space-between; align-items: center;
  cursor: pointer;
  font-weight: 600;
  font-size: var(--font-size-base);
  color: var(--text);
  transition: color var(--transition);
  user-select: none;
}
.faq-question:hover { color: var(--primary); }
.faq-question i { color: var(--secondary); transition: transform var(--transition); font-size: var(--font-size-sm); }
.faq-item.active .faq-question i { transform: rotate(180deg); }
.faq-answer {
  padding: 0 var(--spacing-xl) var(--spacing-lg);
  font-size: var(--font-size-sm);
  color: var(--text-light);
  line-height: 1.7;
  display: none;
}
.faq-item.active .faq-answer { display: block; }
@media (max-width: 520px) {
  .faq-question { padding: var(--spacing-md) var(--spacing-lg); font-size: var(--font-size-sm); }
  .faq-answer { padding: 0 var(--spacing-lg) var(--spacing-md); }
}

/* ===== CTA Section ===== */
.cta-section {
  background: var(--bg-dark);
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('/assets/images/backpic/back-3.png') center/cover;
  opacity: 0.06;
  pointer-events: none;
}
.cta-section::after {
  content: '';
  position: absolute;
  top: -50%; right: -20%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(245,158,11,0.08), transparent);
  border-radius: 50%;
  pointer-events: none;
}
.cta-content { position: relative; z-index: 1; text-align: center; padding: var(--spacing-3xl) 0; }
.cta-content h2 { font-size: var(--font-size-4xl); color: var(--text-white); margin-bottom: var(--spacing-md); }
.cta-content p { font-size: var(--font-size-lg); color: rgba(255,255,255,0.7); max-width: 560px; margin: 0 auto var(--spacing-2xl); }
.cta-content .btn-cta {
  display: inline-flex; align-items: center; gap: var(--spacing-sm);
  background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
  color: var(--text-white);
  padding: 18px 48px;
  border-radius: 50px;
  font-size: var(--font-size-base);
  font-weight: 700;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 8px 30px rgba(245,158,11,0.35);
}
.cta-content .btn-cta:hover { transform: translateY(-3px); box-shadow: 0 12px 40px rgba(245,158,11,0.5); color: var(--text-white); }
@media (max-width: 768px) { .cta-content h2 { font-size: var(--font-size-3xl); } .cta-content p { font-size: var(--font-size-base); } }
@media (max-width: 520px) { .cta-content h2 { font-size: var(--font-size-2xl); } .cta-content .btn-cta { width: 100%; justify-content: center; padding: 16px 32px; } }

/* ===== Footer ===== */
.footer {
  background: var(--primary-dark);
  color: rgba(255,255,255,0.7);
  padding: var(--spacing-3xl) 0 var(--spacing-lg);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}
.footer-brand .logo-text { color: var(--text-white); font-size: var(--font-size-xl); }
.footer-brand p { font-size: var(--font-size-sm); line-height: 1.7; margin-top: var(--spacing-md); color: rgba(255,255,255,0.6); }
.footer-social { display: flex; gap: var(--spacing-sm); margin-top: var(--spacing-lg); }
.footer-social a {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,0.6);
  transition: background var(--transition), color var(--transition);
  font-size: var(--font-size-sm);
}
.footer-social a:hover { background: var(--secondary); color: var(--primary-dark); }
.footer h4 { font-size: var(--font-size-base); color: var(--text-white); margin-bottom: var(--spacing-lg); font-weight: 600; }
.footer-links li { margin-bottom: var(--spacing-sm); }
.footer-links a { font-size: var(--font-size-sm); color: rgba(255,255,255,0.6); transition: color var(--transition); }
.footer-links a:hover { color: var(--secondary); }
.footer-contact li { display: flex; align-items: flex-start; gap: var(--spacing-sm); font-size: var(--font-size-sm); margin-bottom: var(--spacing-md); color: rgba(255,255,255,0.6); }
.footer-contact li i { color: var(--secondary); margin-top: 3px; flex-shrink: 0; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  font-size: var(--font-size-xs);
  color: rgba(255,255,255,0.4);
}
.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: var(--secondary); }
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .footer-grid { grid-template-columns: 1fr; } .footer-bottom { flex-direction: column; text-align: center; } }

/* ===== Back to Top ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: var(--text-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: var(--shadow-lg);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity var(--transition), visibility var(--transition), transform var(--transition), background var(--transition);
}
.back-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--secondary); color: var(--primary-dark); transform: translateY(-4px); }

/* roulang page: article */
/* ===== Design Variables ===== */
:root {
  --primary: #1a3a6b;
  --primary-light: #2a5a9e;
  --primary-dark: #0f2444;
  --secondary: #e8a838;
  --secondary-light: #f0c060;
  --secondary-dark: #c88a20;
  --accent: #3b82f6;
  --success: #10b981;
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --bg-dark: #0f172a;
  --bg-section: #f1f5f9;
  --text: #1e293b;
  --text-light: #64748b;
  --text-white: #f8fafc;
  --border: #e2e8f0;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow: 0 4px 20px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.10);
  --shadow-hover: 0 12px 32px rgba(0,0,0,0.12);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;
  --max-width: 1200px;
  --header-h: 78px;
}

/* ===== 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); font-size: 16px; line-height: 1.7; color: var(--text); background: var(--bg); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-light); }
button, input, textarea { font-family: inherit; font-size: inherit; outline: none; border: none; }
ul, ol { list-style: none; }
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
@media (max-width: 768px) { .container { padding: 0 16px; } }

/* ===== Header & Nav ===== */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.96); backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border); height: var(--header-h);
  transition: var(--transition);
}
.header .container { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-icon {
  width: 40px; height: 40px; border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff; display: flex; align-items: center; justify-content: center;
  font-size: 20px; font-weight: 700; letter-spacing: 1px; box-shadow: 0 4px 12px rgba(26,58,107,0.3);
}
.logo-text { font-size: 22px; font-weight: 800; color: var(--primary); letter-spacing: 1px; }
.logo-text span { color: var(--secondary); font-weight: 700; }
.nav { display: flex; align-items: center; gap: 8px; }
.nav a {
  padding: 8px 20px; border-radius: var(--radius-sm); font-size: 15px; font-weight: 500;
  color: var(--text); transition: var(--transition); position: relative; white-space: nowrap;
}
.nav a:hover { color: var(--primary); background: rgba(26,58,107,0.06); }
.nav a.active { color: var(--primary); background: rgba(26,58,107,0.10); font-weight: 600; }
.nav a.active::after { content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 20px; height: 3px; border-radius: 4px; background: var(--secondary); }
.nav-cta {
  background: linear-gradient(135deg, var(--secondary), var(--secondary-dark)) !important;
  color: #fff !important; padding: 9px 24px !important; border-radius: var(--radius-sm) !important;
  font-weight: 600 !important; box-shadow: 0 4px 14px rgba(232,168,56,0.35);
  display: flex; align-items: center; gap: 8px;
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(232,168,56,0.45) !important; color: #fff !important; }
.nav-cta i { font-size: 14px; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 6px; background: none; }
.nav-toggle span { display: block; width: 26px; height: 2.5px; background: var(--primary); border-radius: 4px; transition: var(--transition); }
@media (max-width: 768px) {
  .nav { position: fixed; top: var(--header-h); left: 0; right: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(16px); flex-direction: column; padding: 20px 24px; border-bottom: 1px solid var(--border); transform: translateY(-120%); opacity: 0; pointer-events: none; transition: var(--transition); box-shadow: var(--shadow-lg); }
  .nav.open { transform: translateY(0); opacity: 1; pointer-events: all; }
  .nav a { width: 100%; text-align: center; padding: 14px 20px; font-size: 17px; }
  .nav-cta { justify-content: center; }
  .nav-toggle { display: flex; }
}

/* ===== Page Banner ===== */
.page-banner {
  margin-top: var(--header-h); padding: 80px 0 60px;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
  position: relative; overflow: hidden; min-height: 280px; display: flex; align-items: center;
}
.page-banner::before {
  content: ''; position: absolute; inset: 0;
  background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  opacity: 0.12; mix-blend-mode: overlay;
}
.page-banner::after {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(232,168,56,0.15) 0%, transparent 70%);
}
.page-banner .container { position: relative; z-index: 2; text-align: center; }
.page-banner h1 {
  font-size: 38px; font-weight: 800; color: var(--text-white);
  line-height: 1.25; margin-bottom: 12px; letter-spacing: 1px;
}
.page-banner .breadcrumb {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  font-size: 14px; color: rgba(255,255,255,0.7); margin-bottom: 16px; flex-wrap: wrap;
}
.page-banner .breadcrumb a { color: rgba(255,255,255,0.8); }
.page-banner .breadcrumb a:hover { color: var(--secondary); }
.page-banner .breadcrumb span { color: rgba(255,255,255,0.5); }
.page-banner .meta {
  display: flex; align-items: center; justify-content: center; gap: 20px;
  font-size: 14px; color: rgba(255,255,255,0.75); flex-wrap: wrap;
}
.page-banner .meta i { margin-right: 6px; }
.page-banner .meta .tag {
  display: inline-block; padding: 4px 16px; border-radius: 20px;
  background: rgba(232,168,56,0.25); color: var(--secondary-light);
  font-size: 13px; font-weight: 500;
}
@media (max-width: 768px) {
  .page-banner { padding: 60px 0 40px; min-height: 220px; }
  .page-banner h1 { font-size: 26px; }
  .page-banner .meta { gap: 12px; font-size: 13px; }
}
@media (max-width: 520px) {
  .page-banner h1 { font-size: 22px; }
  .page-banner .meta { flex-direction: column; gap: 8px; }
}

/* ===== Article Main ===== */
.article-main { padding: 60px 0 80px; }
.article-layout {
  display: grid; grid-template-columns: 1fr 300px; gap: 48px;
  align-items: start;
}
.article-body { background: var(--bg-card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 48px; }
.article-body .content { font-size: 17px; line-height: 1.9; color: var(--text); }
.article-body .content h2 { font-size: 26px; font-weight: 700; color: var(--primary); margin: 40px 0 16px; padding-bottom: 10px; border-bottom: 2px solid var(--border); }
.article-body .content h3 { font-size: 21px; font-weight: 600; color: var(--primary); margin: 32px 0 12px; }
.article-body .content p { margin-bottom: 20px; }
.article-body .content ul, .article-body .content ol { margin: 0 0 20px 24px; }
.article-body .content li { margin-bottom: 8px; list-style: disc; }
.article-body .content ol li { list-style: decimal; }
.article-body .content a { color: var(--accent); border-bottom: 1px solid transparent; }
.article-body .content a:hover { border-bottom-color: var(--accent); }
.article-body .content blockquote {
  margin: 24px 0; padding: 20px 28px; background: var(--bg-section);
  border-left: 4px solid var(--secondary); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic; color: var(--text-light);
}
.article-body .content code {
  background: var(--bg-section); padding: 2px 10px; border-radius: 4px;
  font-family: 'Courier New', monospace; font-size: 0.9em; color: var(--primary);
}
.article-body .content pre {
  background: var(--bg-dark); color: #e2e8f0; padding: 24px; border-radius: var(--radius-sm);
  overflow-x: auto; margin: 24px 0; font-size: 14px; line-height: 1.6;
}
.article-body .content pre code { background: none; color: inherit; padding: 0; }
.article-body .content img { border-radius: var(--radius-sm); margin: 24px auto; box-shadow: var(--shadow); }
.article-body .content table { width: 100%; border-collapse: collapse; margin: 24px 0; }
.article-body .content th, .article-body .content td { padding: 12px 16px; border: 1px solid var(--border); text-align: left; }
.article-body .content th { background: var(--bg-section); font-weight: 600; color: var(--primary); }
.article-body .content hr { border: none; height: 1px; background: var(--border); margin: 40px 0; }
.article-footer-bar {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--border); flex-wrap: wrap; gap: 16px;
}
.article-footer-bar .share { display: flex; align-items: center; gap: 12px; }
.article-footer-bar .share span { font-size: 14px; color: var(--text-light); }
.article-footer-bar .share a {
  width: 40px; height: 40px; border-radius: 50%; background: var(--bg-section);
  display: flex; align-items: center; justify-content: center; color: var(--text-light);
  transition: var(--transition); font-size: 16px;
}
.article-footer-bar .share a:hover { background: var(--primary); color: #fff; transform: translateY(-3px); }
.article-footer-bar .back-link { display: flex; align-items: center; gap: 8px; font-weight: 500; color: var(--primary); }
.article-footer-bar .back-link i { transition: var(--transition); }
.article-footer-bar .back-link:hover i { transform: translateX(-4px); }
@media (max-width: 1024px) {
  .article-layout { grid-template-columns: 1fr; gap: 32px; }
}
@media (max-width: 768px) {
  .article-body { padding: 28px 20px; }
  .article-body .content { font-size: 16px; }
  .article-body .content h2 { font-size: 22px; }
  .article-body .content h3 { font-size: 18px; }
}
@media (max-width: 520px) {
  .article-main { padding: 40px 0 60px; }
  .article-body { padding: 20px 16px; }
  .article-footer-bar { flex-direction: column; align-items: flex-start; }
}

/* ===== Sidebar ===== */
.article-sidebar { display: flex; flex-direction: column; gap: 28px; }
.sidebar-card { background: var(--bg-card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 28px 24px; }
.sidebar-card h3 { font-size: 18px; font-weight: 700; color: var(--primary); margin-bottom: 16px; display: flex; align-items: center; gap: 10px; }
.sidebar-card h3::after { content: ''; flex: 1; height: 2px; background: linear-gradient(90deg, var(--secondary), transparent); }
.sidebar-list { display: flex; flex-direction: column; gap: 12px; }
.sidebar-list li { border-bottom: 1px solid var(--border); padding-bottom: 12px; }
.sidebar-list li:last-child { border-bottom: none; padding-bottom: 0; }
.sidebar-list a { display: flex; gap: 12px; align-items: flex-start; color: var(--text); transition: var(--transition); }
.sidebar-list a:hover { color: var(--primary); }
.sidebar-list .thumb { width: 60px; height: 45px; border-radius: 6px; object-fit: cover; flex-shrink: 0; background: var(--bg-section); }
.sidebar-list .info { flex: 1; }
.sidebar-list .info .title { font-size: 14px; font-weight: 600; line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.sidebar-list .info .date { font-size: 12px; color: var(--text-light); margin-top: 4px; }
.sidebar-cta { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); color: #fff; text-align: center; padding: 32px 24px; }
.sidebar-cta h3 { color: #fff; }
.sidebar-cta h3::after { background: linear-gradient(90deg, var(--secondary), transparent); }
.sidebar-cta p { font-size: 14px; opacity: 0.85; margin-bottom: 20px; line-height: 1.6; }
.sidebar-cta .btn { background: var(--secondary); color: var(--primary-dark); padding: 12px 32px; border-radius: var(--radius-sm); font-weight: 700; display: inline-flex; align-items: center; gap: 8px; box-shadow: 0 4px 16px rgba(232,168,56,0.4); }
.sidebar-cta .btn:hover { background: var(--secondary-light); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(232,168,56,0.5); }
@media (max-width: 1024px) {
  .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
}
@media (max-width: 520px) {
  .article-sidebar { grid-template-columns: 1fr; }
}

/* ===== Related Posts ===== */
.related-section { padding: 60px 0; background: var(--bg-section); }
.related-section .section-title { text-align: center; margin-bottom: 40px; }
.related-section .section-title h2 { font-size: 30px; font-weight: 800; color: var(--primary); }
.related-section .section-title p { color: var(--text-light); margin-top: 8px; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.related-card { background: var(--bg-card); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: var(--transition); }
.related-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.related-card .card-img { height: 180px; background: var(--bg-section); overflow: hidden; }
.related-card .card-img img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
.related-card:hover .card-img img { transform: scale(1.05); }
.related-card .card-body { padding: 20px 22px 24px; }
.related-card .card-body .tag { display: inline-block; padding: 2px 12px; border-radius: 12px; background: rgba(232,168,56,0.15); color: var(--secondary-dark); font-size: 12px; font-weight: 600; margin-bottom: 10px; }
.related-card .card-body h3 { font-size: 17px; font-weight: 700; line-height: 1.4; margin-bottom: 8px; }
.related-card .card-body h3 a { color: var(--text); }
.related-card .card-body h3 a:hover { color: var(--primary); }
.related-card .card-body p { font-size: 14px; color: var(--text-light); line-height: 1.6; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.related-card .card-body .date { font-size: 12px; color: var(--text-light); margin-top: 12px; display: flex; align-items: center; gap: 6px; }
@media (max-width: 900px) {
  .related-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .related-grid { grid-template-columns: 1fr; }
  .related-section .section-title h2 { font-size: 24px; }
}

/* ===== CTA Section ===== */
.cta-section {
  padding: 72px 0; background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  position: relative; overflow: hidden; text-align: center;
}
.cta-section::before {
  content: ''; position: absolute; inset: 0;
  background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  opacity: 0.08; mix-blend-mode: overlay;
}
.cta-section .container { position: relative; z-index: 2; }
.cta-section h2 { font-size: 34px; font-weight: 800; color: #fff; margin-bottom: 12px; }
.cta-section p { font-size: 17px; color: rgba(255,255,255,0.8); max-width: 600px; margin: 0 auto 32px; line-height: 1.7; }
.cta-section .btn-group { display: flex; align-items: center; justify-content: center; gap: 16px; flex-wrap: wrap; }
.cta-section .btn-primary { background: var(--secondary); color: var(--primary-dark); padding: 16px 40px; border-radius: var(--radius-sm); font-size: 17px; font-weight: 700; display: inline-flex; align-items: center; gap: 10px; box-shadow: 0 6px 24px rgba(232,168,56,0.4); transition: var(--transition); }
.cta-section .btn-primary:hover { background: var(--secondary-light); transform: translateY(-3px); box-shadow: 0 12px 36px rgba(232,168,56,0.5); }
.cta-section .btn-outline { border: 2px solid rgba(255,255,255,0.4); color: #fff; padding: 14px 36px; border-radius: var(--radius-sm); font-size: 17px; font-weight: 600; transition: var(--transition); }
.cta-section .btn-outline:hover { border-color: var(--secondary); color: var(--secondary); background: rgba(232,168,56,0.10); transform: translateY(-3px); }
@media (max-width: 768px) {
  .cta-section { padding: 52px 0; }
  .cta-section h2 { font-size: 26px; }
  .cta-section p { font-size: 15px; }
  .cta-section .btn-primary, .cta-section .btn-outline { padding: 14px 28px; font-size: 15px; }
}

/* ===== Not Found ===== */
.not-found { text-align: center; padding: 80px 20px; }
.not-found .icon { font-size: 64px; color: var(--text-light); margin-bottom: 20px; opacity: 0.5; }
.not-found h2 { font-size: 28px; color: var(--text); margin-bottom: 12px; }
.not-found p { color: var(--text-light); margin-bottom: 24px; font-size: 16px; }
.not-found .btn { display: inline-flex; align-items: center; gap: 8px; background: var(--primary); color: #fff; padding: 14px 32px; border-radius: var(--radius-sm); font-weight: 600; transition: var(--transition); }
.not-found .btn:hover { background: var(--primary-light); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(26,58,107,0.3); }

/* ===== Footer ===== */
.footer { background: var(--bg-dark); color: rgba(255,255,255,0.8); padding: 60px 0 0; }
.footer .container { max-width: var(--max-width); }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,0.08); }
.footer-brand .logo-text { color: #fff; font-size: 20px; margin-bottom: 12px; }
.footer-brand .logo-text span { color: var(--secondary); }
.footer-brand p { font-size: 14px; line-height: 1.7; opacity: 0.7; margin-bottom: 20px; max-width: 360px; }
.footer-social { display: flex; gap: 12px; }
.footer-social a { width: 40px; height: 40px; border-radius: 50%; background: rgba(255,255,255,0.08); display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,0.6); transition: var(--transition); font-size: 16px; }
.footer-social a:hover { background: var(--secondary); color: var(--bg-dark); transform: translateY(-3px); }
.footer h4 { color: #fff; font-size: 16px; font-weight: 700; margin-bottom: 18px; position: relative; padding-bottom: 10px; }
.footer h4::after { content: ''; position: absolute; bottom: 0; left: 0; width: 28px; height: 3px; border-radius: 4px; background: var(--secondary); }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { color: rgba(255,255,255,0.6); font-size: 14px; transition: var(--transition); display: flex; align-items: center; gap: 8px; }
.footer-links a:hover { color: var(--secondary); transform: translateX(4px); }
.footer-links a::before { content: '›'; font-size: 16px; font-weight: 700; color: var(--secondary); opacity: 0.6; }
.footer-contact { display: flex; flex-direction: column; gap: 12px; }
.footer-contact li { display: flex; align-items: center; gap: 12px; font-size: 14px; color: rgba(255,255,255,0.6); }
.footer-contact li i { width: 20px; color: var(--secondary); font-size: 14px; }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; padding: 24px 0; font-size: 13px; 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(--secondary); }
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 520px) {
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* ===== Utility ===== */
.text-center { text-align: center; }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }
@media (max-width: 768px) {
  .hide-mobile { display: none !important; }
}

/* roulang page: category1 */
/* ========== Design Variables ========== */
        :root {
            --primary: #1a3a6b;
            --primary-light: #2a5298;
            --primary-dark: #0f2450;
            --secondary: #e8a838;
            --secondary-light: #f0c060;
            --secondary-dark: #c88a20;
            --accent: #d94a4a;
            --bg-body: #f5f7fa;
            --bg-card: #ffffff;
            --bg-dark: #0f2450;
            --bg-section-alt: #eef1f7;
            --text-primary: #1a2a3a;
            --text-secondary: #4a5a6a;
            --text-light: #8a9aaa;
            --text-white: #ffffff;
            --border-color: #e2e6ed;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 24px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 6px 28px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
            --max-width: 1200px;
            --header-height: 76px;
            --topbar-height: 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: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--header-height);
        }

        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--secondary);
        }
        a:focus-visible {
            outline: 3px solid var(--secondary);
            outline-offset: 2px;
            border-radius: 4px;
        }

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

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

        button {
            cursor: pointer;
            background: none;
        }

        ul,
        ol {
            list-style: none;
        }

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

        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .section-padding {
            padding: 80px 0;
        }
        .section-padding-sm {
            padding: 48px 0;
        }

        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            text-align: center;
            margin-bottom: 16px;
            color: var(--text-primary);
            letter-spacing: -0.5px;
        }
        .section-subtitle {
            font-size: 1.1rem;
            text-align: center;
            color: var(--text-secondary);
            max-width: 680px;
            margin: 0 auto 48px;
            line-height: 1.8;
        }
        .section-subtitle a {
            color: var(--primary-light);
            font-weight: 600;
        }

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

        /* ========== Button System ========== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            padding: 14px 34px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            line-height: 1.2;
            transition: var(--transition);
            border: 2px solid transparent;
            text-decoration: none;
            cursor: pointer;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--primary);
            color: var(--text-white);
            border-color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--primary-light);
            border-color: var(--primary-light);
            color: var(--text-white);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(26, 58, 107, 0.3);
        }
        .btn-secondary {
            background: var(--secondary);
            color: var(--primary-dark);
            border-color: var(--secondary);
        }
        .btn-secondary:hover {
            background: var(--secondary-light);
            border-color: var(--secondary-light);
            color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(232, 168, 56, 0.35);
        }
        .btn-outline {
            background: transparent;
            color: var(--text-white);
            border-color: rgba(255, 255, 255, 0.6);
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.15);
            border-color: var(--text-white);
            color: var(--text-white);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 10px 22px;
            font-size: 0.9rem;
        }
        .btn-lg {
            padding: 18px 44px;
            font-size: 1.1rem;
        }
        .btn i {
            font-size: 1.1em;
        }

        /* ========== Badge / Tag ========== */
        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            background: var(--bg-section-alt);
            color: var(--text-secondary);
            border: 1px solid var(--border-color);
        }
        .badge-primary {
            background: rgba(26, 58, 107, 0.1);
            color: var(--primary);
            border-color: rgba(26, 58, 107, 0.2);
        }
        .badge-secondary {
            background: rgba(232, 168, 56, 0.15);
            color: var(--secondary-dark);
            border-color: rgba(232, 168, 56, 0.25);
        }
        .badge-hot {
            background: rgba(217, 74, 74, 0.12);
            color: var(--accent);
            border-color: rgba(217, 74, 74, 0.2);
        }

        /* ========== Header & Navigation ========== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-color);
            height: var(--header-height);
            display: flex;
            align-items: center;
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
            transition: var(--transition);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            gap: 20px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 40px;
            height: 40px;
            background: var(--primary);
            color: var(--text-white);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            font-weight: 800;
            letter-spacing: 0;
            box-shadow: 0 4px 12px rgba(26, 58, 107, 0.25);
        }
        .logo-text {
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.3px;
            line-height: 1.2;
        }
        .logo-text span {
            color: var(--secondary);
        }

        .nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav a {
            padding: 8px 18px;
            border-radius: 50px;
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
            text-decoration: none;
        }
        .nav a:hover {
            color: var(--primary);
            background: rgba(26, 58, 107, 0.06);
        }
        .nav a.active {
            color: var(--text-white);
            background: var(--primary);
            box-shadow: 0 4px 16px rgba(26, 58, 107, 0.25);
        }
        .nav a.active:hover {
            background: var(--primary-light);
            color: var(--text-white);
        }
        .nav-cta {
            background: var(--secondary) !important;
            color: var(--primary-dark) !important;
            font-weight: 700 !important;
            padding: 8px 24px !important;
            border-radius: 50px !important;
            margin-left: 8px;
            box-shadow: 0 4px 16px rgba(232, 168, 56, 0.3);
        }
        .nav-cta:hover {
            background: var(--secondary-light) !important;
            transform: translateY(-1px);
            box-shadow: 0 6px 24px rgba(232, 168, 56, 0.4) !important;
        }
        .nav-cta i {
            font-size: 0.9em;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 4px 2px;
            background: none;
            border: none;
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 3px;
            background: var(--primary);
            border-radius: 3px;
            transition: var(--transition);
        }
        .nav-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 6px);
        }
        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .nav-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -6px);
        }

        /* ========== Hero / Banner ========== */
        .category-hero {
            position: relative;
            padding: 100px 0 80px;
            background: var(--primary-dark);
            color: var(--text-white);
            overflow: hidden;
            min-height: 360px;
            display: flex;
            align-items: center;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.3;
            z-index: 0;
        }
        .category-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 36, 80, 0.85) 0%, rgba(26, 58, 107, 0.7) 100%);
            z-index: 1;
        }
        .category-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .category-hero .breadcrumb {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 20px;
        }
        .category-hero .breadcrumb a {
            color: rgba(255, 255, 255, 0.8);
            text-decoration: none;
        }
        .category-hero .breadcrumb a:hover {
            color: var(--secondary);
        }
        .category-hero .breadcrumb span {
            color: rgba(255, 255, 255, 0.5);
        }
        .category-hero h1 {
            font-size: 3rem;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: -1px;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
        }
        .category-hero p {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 640px;
            margin: 0 auto 28px;
            line-height: 1.8;
        }
        .category-hero .hero-tags {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            flex-wrap: wrap;
        }
        .category-hero .hero-tags .badge {
            background: rgba(255, 255, 255, 0.12);
            color: var(--text-white);
            border-color: rgba(255, 255, 255, 0.2);
            font-size: 0.85rem;
            padding: 6px 18px;
        }

        /* ========== Section: Platform Overview ========== */
        .platform-overview {
            background: var(--bg-card);
        }
        .overview-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }
        .overview-image {
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            position: relative;
        }
        .overview-image img {
            width: 100%;
            height: 360px;
            object-fit: cover;
            transition: var(--transition);
        }
        .overview-image:hover img {
            transform: scale(1.03);
        }
        .overview-content h2 {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 16px;
            color: var(--text-primary);
        }
        .overview-content h2 span {
            color: var(--secondary);
        }
        .overview-content p {
            color: var(--text-secondary);
            margin-bottom: 18px;
            font-size: 1.05rem;
            line-height: 1.8;
        }
        .overview-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
            margin-top: 20px;
        }
        .overview-features li {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-secondary);
            font-size: 0.95rem;
        }
        .overview-features li i {
            color: var(--secondary);
            font-size: 1.1rem;
            width: 22px;
        }

        /* ========== Section: Steps / Flow ========== */
        .steps-section {
            background: var(--bg-section-alt);
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-top: 10px;
        }
        .step-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 36px 28px 32px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            position: relative;
        }
        .step-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: transparent;
        }
        .step-number {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--text-white);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            font-weight: 800;
            margin: 0 auto 18px;
            box-shadow: 0 6px 20px rgba(26, 58, 107, 0.25);
        }
        .step-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-primary);
        }
        .step-card p {
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.7;
        }
        .step-card .step-link {
            display: inline-block;
            margin-top: 16px;
            font-weight: 600;
            color: var(--primary-light);
            font-size: 0.9rem;
        }
        .step-card .step-link i {
            transition: var(--transition);
        }
        .step-card .step-link:hover i {
            transform: translateX(4px);
        }

        /* ========== Section: Feature Cards ========== */
        .features-section {
            background: var(--bg-card);
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: transparent;
        }
        .feature-card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: 0;
            transition: var(--transition);
        }
        .feature-card:hover .card-img {
            transform: scale(1.03);
        }
        .feature-card .card-body {
            padding: 24px 24px 28px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .feature-card .card-body .badge {
            align-self: flex-start;
            margin-bottom: 12px;
        }
        .feature-card .card-body h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-primary);
        }
        .feature-card .card-body p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
            flex: 1;
        }
        .feature-card .card-body .card-footer-link {
            margin-top: 16px;
            font-weight: 600;
            color: var(--primary-light);
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .feature-card .card-body .card-footer-link i {
            transition: var(--transition);
        }
        .feature-card .card-body .card-footer-link:hover i {
            transform: translateX(4px);
        }

        /* ========== Section: Tips / Notice ========== */
        .tips-section {
            background: var(--bg-section-alt);
        }
        .tips-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .tip-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 28px 32px;
            display: flex;
            gap: 20px;
            align-items: flex-start;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .tip-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .tip-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            background: rgba(26, 58, 107, 0.08);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            flex-shrink: 0;
        }
        .tip-item h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 6px;
            color: var(--text-primary);
        }
        .tip-item p {
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.7;
        }

        /* ========== Section: FAQ ========== */
        .faq-section {
            background: var(--bg-card);
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-body);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(26, 58, 107, 0.15);
        }
        .faq-question {
            width: 100%;
            padding: 20px 28px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            font-weight: 600;
            font-size: 1.02rem;
            color: var(--text-primary);
            background: none;
            border: none;
            cursor: pointer;
            text-align: left;
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question i {
            color: var(--primary);
            transition: var(--transition);
            font-size: 1.1rem;
            flex-shrink: 0;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
            color: var(--secondary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 28px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.8;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 28px 22px;
        }

        /* ========== Section: CTA ========== */
        .cta-section {
            background: var(--primary-dark);
            position: relative;
            overflow: hidden;
            padding: 72px 0;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.12;
            z-index: 0;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 36, 80, 0.92) 0%, rgba(26, 58, 107, 0.8) 100%);
            z-index: 1;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 16px;
        }
        .cta-section p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 560px;
            margin: 0 auto 32px;
            line-height: 1.8;
        }
        .cta-section .btn-group {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ========== Footer ========== */
        .footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.75);
            padding: 64px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .logo-text {
            color: var(--text-white);
            font-size: 1.3rem;
            margin-bottom: 16px;
            display: inline-block;
        }
        .footer-brand .logo-text span {
            color: var(--secondary);
        }
        .footer-brand p {
            font-size: 0.92rem;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 20px;
            max-width: 340px;
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            color: rgba(255, 255, 255, 0.7);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            transition: var(--transition);
            text-decoration: none;
        }
        .footer-social a:hover {
            background: var(--secondary);
            color: var(--primary-dark);
            transform: translateY(-3px);
        }

        .footer h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 18px;
            letter-spacing: 0.5px;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .footer-links a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.92rem;
            transition: var(--transition);
            text-decoration: none;
        }
        .footer-links a:hover {
            color: var(--secondary);
            padding-left: 4px;
        }

        .footer-contact li {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 14px;
            font-size: 0.92rem;
            color: rgba(255, 255, 255, 0.6);
        }
        .footer-contact li i {
            width: 18px;
            color: var(--secondary);
            font-size: 1rem;
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 24px 0 32px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.45);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
            text-decoration: none;
        }
        .footer-bottom a:hover {
            color: var(--secondary);
        }

        /* ========== Responsive ========== */
        @media (max-width: 1024px) {
            .overview-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .overview-image img {
                height: 280px;
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 32px;
            }
            .category-hero h1 {
                font-size: 2.4rem;
            }
        }

        @media (max-width: 768px) {
            :root {
                --header-height: 66px;
            }
            .section-padding {
                padding: 56px 0;
            }
            .section-title {
                font-size: 1.7rem;
            }
            .section-subtitle {
                font-size: 1rem;
                margin-bottom: 32px;
            }
            .container {
                padding: 0 16px;
            }

            .nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(12px);
                -webkit-backdrop-filter: blur(12px);
                flex-direction: column;
                padding: 20px 24px 28px;
                gap: 8px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
                transform: translateY(-120%);
                opacity: 0;
                transition: var(--transition);
                pointer-events: none;
                border-radius: 0 0 var(--radius-md) var(--radius-md);
            }
            .nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            .nav a {
                width: 100%;
                text-align: center;
                padding: 12px 18px;
                font-size: 1rem;
            }
            .nav-cta {
                margin-left: 0 !important;
                margin-top: 6px;
            }
            .nav-toggle {
                display: flex;
            }

            .category-hero {
                padding: 70px 0 56px;
                min-height: 280px;
            }
            .category-hero h1 {
                font-size: 2rem;
            }
            .category-hero p {
                font-size: 1rem;
            }

            .steps-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .step-card {
                padding: 24px 18px 24px;
            }
            .step-number {
                width: 44px;
                height: 44px;
                font-size: 1.1rem;
            }

            .features-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .tips-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .tip-item {
                padding: 20px 22px;
                flex-direction: column;
                gap: 12px;
            }

            .overview-features {
                grid-template-columns: 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-section h2 {
                font-size: 1.8rem;
            }
        }

        @media (max-width: 520px) {
            .section-title {
                font-size: 1.4rem;
            }
            .category-hero h1 {
                font-size: 1.6rem;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .overview-image img {
                height: 200px;
            }
            .btn-lg {
                padding: 14px 28px;
                font-size: 1rem;
            }
            .cta-section .btn-group {
                flex-direction: column;
                width: 100%;
            }
            .cta-section .btn-group .btn {
                width: 100%;
            }
            .logo-text {
                font-size: 1.1rem;
            }
            .logo-icon {
                width: 34px;
                height: 34px;
                font-size: 1.1rem;
            }
        }