/* roulang page: index */
/* ===== 设计变量 ===== */
:root {
  --primary: #0b0f2a;
  --primary-light: #141a3a;
  --primary-dark: #06091a;
  --accent: #f0b429;
  --accent-light: #f7c948;
  --accent-dark: #d49a1a;
  --accent-glow: rgba(240, 180, 41, 0.25);
  --bg-body: #070a1a;
  --bg-card: rgba(20, 26, 58, 0.85);
  --bg-card-hover: rgba(30, 38, 72, 0.92);
  --bg-section-alt: rgba(11, 15, 42, 0.7);
  --text-primary: #f0f2f8;
  --text-secondary: #b0b8d0;
  --text-muted: #687090;
  --text-accent: #f0b429;
  --border-color: rgba(240, 180, 41, 0.15);
  --border-light: rgba(255, 255, 255, 0.06);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 56px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 30px rgba(240, 180, 41, 0.1);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --container-max: 1200px;
  --header-height: 76px;
}

/* ===== 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-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-body);
  min-height: 100vh;
  overflow-x: hidden;
}
a { color: var(--text-accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-light); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 4px; }
img { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 8px; }
input, textarea { font-family: inherit; font-size: 1rem; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--text-primary); }
h1 { font-size: clamp(2.4rem, 6vw, 4rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.75rem); }
h4 { font-size: clamp(1.1rem, 1.8vw, 1.35rem); }
p { margin-bottom: 1em; color: var(--text-secondary); }
p:last-child { margin-bottom: 0; }
::selection { background: var(--accent); color: var(--primary); }

/* ===== Container ===== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}
@media (max-width: 768px) {
  .container { padding: 0 16px; }
}

/* ===== Header / Nav ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(7, 10, 26, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  height: var(--header-height);
  transition: background var(--transition), box-shadow var(--transition);
}
.site-header.scrolled {
  background: rgba(7, 10, 26, 0.98);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}
.logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--primary);
  font-weight: 900;
  flex-shrink: 0;
}
.logo span { background: linear-gradient(135deg, #fff 30%, var(--accent-light) 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-list a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
  position: relative;
  white-space: nowrap;
}
.nav-list a i { font-size: 0.85rem; opacity: 0.7; }
.nav-list a:hover { color: var(--text-primary); background: var(--border-light); }
.nav-list a.active {
  color: var(--text-accent);
  background: var(--accent-glow);
}
.nav-list a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 3px;
  background: var(--accent);
  border-radius: 4px;
}
.header-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}
.btn-join {
  padding: 10px 28px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: var(--primary);
  font-weight: 700;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  box-shadow: 0 4px 20px var(--accent-glow);
  display: flex;
  align-items: center;
  gap: 8px;
}
.btn-join:hover { transform: translateY(-2px); box-shadow: 0 8px 32px var(--accent-glow); color: var(--primary); }
.btn-join:active { transform: translateY(0); }

/* Mobile toggle */
.mobile-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  font-size: 1.5rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}
.mobile-toggle:hover { background: var(--border-light); }
@media (max-width: 820px) {
  .nav-list { display: none; }
  .nav-list.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(7, 10, 26, 0.98);
    backdrop-filter: blur(20px);
    padding: 16px 24px 24px;
    gap: 4px;
    border-bottom: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
  }
  .nav-list.open a { padding: 14px 20px; font-size: 1rem; }
  .mobile-toggle { display: flex; }
  .header-cta .btn-join { padding: 10px 20px; font-size: 0.85rem; }
  .header-cta .btn-join span { display: none; }
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--header-height) 0 80px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
  z-index: 0;
}
.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(7, 10, 26, 0.88) 30%, rgba(7, 10, 26, 0.5) 70%, rgba(7, 10, 26, 0.3));
  z-index: 1;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 20% 50%, rgba(240, 180, 41, 0.06) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 20%, rgba(240, 180, 41, 0.04) 0%, transparent 50%);
  z-index: 1;
}
.hero .container {
  position: relative;
  z-index: 2;
}
.hero-content {
  max-width: 720px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border: 1px solid var(--accent-glow);
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-accent);
  background: rgba(240, 180, 41, 0.08);
  margin-bottom: 24px;
  letter-spacing: 0.3px;
}
.hero-badge i { font-size: 0.7rem; }
.hero-title {
  font-size: clamp(2.6rem, 7vw, 4.6rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero-title .highlight {
  background: linear-gradient(135deg, var(--accent), #f7d070, var(--accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-desc {
  font-size: clamp(1.05rem, 1.8vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 36px;
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}
.btn-primary {
  padding: 16px 40px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: var(--primary);
  font-weight: 700;
  font-size: 1rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  box-shadow: 0 4px 24px var(--accent-glow);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 40px var(--accent-glow); color: var(--primary); }
.btn-primary:active { transform: translateY(-1px); }
.btn-secondary {
  padding: 16px 36px;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(255,255,255,0.04);
}
.btn-secondary:hover { background: var(--border-light); border-color: var(--accent); color: var(--text-accent); transform: translateY(-3px); }
.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  margin-top: 56px;
  padding-top: 36px;
  border-top: 1px solid var(--border-light);
}
.hero-stat-item { text-align: left; }
.hero-stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.2;
}
.hero-stat-number .accent { color: var(--text-accent); }
.hero-stat-label { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }
@media (max-width: 768px) {
  .hero { min-height: 90vh; padding: var(--header-height) 0 60px; }
  .hero-stats { gap: 24px; }
  .hero-stat-number { font-size: 1.6rem; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn-primary, .hero-actions .btn-secondary { justify-content: center; }
}

/* ===== Section base ===== */
.section {
  padding: 90px 0;
  position: relative;
}
.section-alt { background: var(--bg-section-alt); }
.section-dark { background: var(--primary-dark); }
.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-header h2 { margin-bottom: 16px; }
.section-header p {
  max-width: 640px;
  margin: 0 auto;
  color: var(--text-secondary);
  font-size: 1.1rem;
}
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-accent);
  background: var(--accent-glow);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
}
@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .section-header { margin-bottom: 40px; }
}

/* ===== Intro / 平台简介 ===== */
.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.intro-text h2 { margin-bottom: 20px; }
.intro-text p { font-size: 1.05rem; color: var(--text-secondary); margin-bottom: 16px; }
.intro-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 28px;
}
.intro-feature {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: all var(--transition);
}
.intro-feature i { color: var(--accent); font-size: 1rem; flex-shrink: 0; }
.intro-feature:hover { border-color: var(--accent-glow); background: var(--bg-card-hover); transform: translateX(4px); }
.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: 320px; }
.intro-image::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  pointer-events: none;
}
@media (max-width: 900px) {
  .intro-grid { grid-template-columns: 1fr; gap: 40px; }
  .intro-features { grid-template-columns: 1fr; }
  .intro-image img { min-height: 240px; }
}

/* ===== Categories / 分类入口 ===== */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.category-card {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  transition: all var(--transition);
  display: block;
  color: var(--text-primary);
}
.category-card:hover { transform: translateY(-6px); border-color: var(--accent-glow); box-shadow: var(--shadow-md), var(--shadow-glow); color: var(--text-primary); }
.category-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.category-card:hover .category-card-img { transform: scale(1.05); }
.category-card-body {
  padding: 24px 28px 28px;
  position: relative;
  z-index: 1;
}
.category-card-body h3 { margin-bottom: 8px; font-size: 1.2rem; }
.category-card-body p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 0; }
.category-card-tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--primary);
  background: var(--accent);
  margin-bottom: 12px;
  letter-spacing: 0.5px;
}
.category-card .card-arrow {
  position: absolute;
  bottom: 28px;
  right: 28px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  transition: all var(--transition);
  font-size: 1rem;
}
.category-card:hover .card-arrow { background: var(--accent); color: var(--primary); transform: rotate(45deg); }

/* ===== Advantages / 核心优势 (数据指标) ===== */
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}
.advantage-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  text-align: center;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.advantage-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}
.advantage-card:hover::before { opacity: 1; }
.advantage-card:hover { transform: translateY(-4px); border-color: var(--accent-glow); box-shadow: var(--shadow-glow); }
.advantage-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-sm);
  background: var(--accent-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: var(--accent);
  margin: 0 auto 20px;
  transition: all var(--transition);
}
.advantage-card:hover .advantage-icon { background: var(--accent); color: var(--primary); transform: scale(1.1); }
.advantage-number {
  font-size: 2.4rem;
  font-weight: 900;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 4px;
}
.advantage-number .accent { color: var(--text-accent); }
.advantage-label { font-size: 0.9rem; color: var(--text-secondary); font-weight: 500; }
.advantage-desc { font-size: 0.85rem; color: var(--text-muted); margin-top: 12px; }

/* ===== News / 资讯列表 (CMS) ===== */
.news-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}
.news-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}
.news-card:hover { transform: translateY(-4px); border-color: var(--accent-glow); box-shadow: var(--shadow-md); }
.news-card-img {
  width: 100%;
  height: 190px;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.news-card:hover .news-card-img { transform: scale(1.05); }
.news-card-body {
  padding: 24px 24px 28px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.news-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.news-card-meta .category {
  padding: 2px 10px;
  border-radius: 50px;
  background: var(--accent-glow);
  color: var(--text-accent);
  font-weight: 600;
  font-size: 0.7rem;
  letter-spacing: 0.3px;
}
.news-card-body h3 {
  font-size: 1.1rem;
  margin-bottom: 12px;
  line-height: 1.4;
  flex: 1;
}
.news-card-body h3 a { color: var(--text-primary); transition: color var(--transition); }
.news-card-body h3 a:hover { color: var(--text-accent); }
.news-card-body p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 16px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.news-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border-light);
  padding-top: 16px;
  margin-top: auto;
}
.news-card-footer a {
  color: var(--text-accent);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition);
}
.news-card-footer a:hover { gap: 10px; }
.news-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px dashed var(--border-color);
  color: var(--text-muted);
  font-size: 1rem;
}
.news-empty i { font-size: 2rem; color: var(--accent); margin-bottom: 16px; display: block; }

/* ===== Process / 使用指南 ===== */
.process-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  counter-reset: step;
}
.process-step {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  text-align: center;
  position: relative;
  transition: all var(--transition);
}
.process-step:hover { border-color: var(--accent-glow); transform: translateY(-4px); box-shadow: var(--shadow-glow); }
.process-step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  top: -12px;
  right: 24px;
  font-size: 3.6rem;
  font-weight: 900;
  color: rgba(240, 180, 41, 0.08);
  line-height: 1;
  pointer-events: none;
  transition: all var(--transition);
}
.process-step:hover::before { color: rgba(240, 180, 41, 0.18); transform: scale(1.1); }
.process-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--accent-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--accent);
  margin: 0 auto 18px;
  transition: all var(--transition);
}
.process-step:hover .process-icon { background: var(--accent); color: var(--primary); }
.process-step h4 { margin-bottom: 8px; font-size: 1.1rem; }
.process-step p { font-size: 0.88rem; color: var(--text-muted); margin-bottom: 0; }

/* ===== FAQ ===== */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: all var(--transition);
}
.faq-item:hover { border-color: var(--accent-glow); }
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  background: none;
  transition: all var(--transition);
  gap: 16px;
}
.faq-question i {
  font-size: 0.85rem;
  color: var(--accent);
  transition: transform var(--transition);
  flex-shrink: 0;
}
.faq-item.open .faq-question i { transform: rotate(180deg); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0 24px;
}
.faq-item.open .faq-answer {
  max-height: 300px;
  padding: 0 24px 20px;
}
.faq-answer p { font-size: 0.92rem; color: var(--text-secondary); margin: 0; line-height: 1.7; }

/* ===== CTA ===== */
.cta-section {
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 50%, var(--accent-glow) 0%, transparent 60%);
  pointer-events: none;
}
.cta-content {
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}
.cta-content h2 { margin-bottom: 16px; }
.cta-content p { font-size: 1.05rem; color: var(--text-secondary); margin-bottom: 32px; }
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--primary-dark);
  border-top: 1px solid var(--border-light);
  padding: 60px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer-brand .logo { margin-bottom: 16px; font-size: 1.2rem; }
.footer-brand p { font-size: 0.9rem; color: var(--text-muted); max-width: 320px; }
.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-primary);
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a {
  color: var(--text-muted);
  font-size: 0.88rem;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 8px;
}
.footer-col ul li a:hover { color: var(--text-accent); padding-left: 4px; }
.footer-col ul li a i { font-size: 0.7rem; color: var(--accent); opacity: 0.6; }
.footer-bottom {
  border-top: 1px solid var(--border-light);
  padding-top: 24px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.footer-bottom p { font-size: 0.82rem; color: var(--text-muted); margin: 0; }
.footer-bottom-links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-bottom-links a { font-size: 0.82rem; color: var(--text-muted); transition: color var(--transition); }
.footer-bottom-links a:hover { color: var(--text-accent); }
@media (max-width: 820px) {
  .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; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

/* ===== Utility ===== */
.text-center { text-align: center; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--primary); }
::-webkit-scrollbar-thumb { background: var(--primary-light); border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ===== Animations ===== */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulseGlow { 0%, 100% { box-shadow: 0 0 20px var(--accent-glow); } 50% { box-shadow: 0 0 40px var(--accent-glow); } }
.animate-in { animation: fadeInUp 0.6s ease forwards; }
.animate-in-delay-1 { animation-delay: 0.1s; }
.animate-in-delay-2 { animation-delay: 0.2s; }
.animate-in-delay-3 { animation-delay: 0.3s; }

/* ===== Responsive extras ===== */
@media (max-width: 520px) {
  .categories-grid { grid-template-columns: 1fr; }
  .advantages-grid { grid-template-columns: 1fr 1fr; }
  .process-steps { grid-template-columns: 1fr; }
  .news-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 2rem; }
  .hero-desc { font-size: 0.95rem; }
  .btn-primary, .btn-secondary { width: 100%; justify-content: center; }
}
@media (max-width: 400px) {
  .advantages-grid { grid-template-columns: 1fr; }
}

/* ===== Back to top ===== */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--primary);
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition);
  z-index: 999;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--accent-light); transform: translateY(-4px); box-shadow: var(--shadow-lg); }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a3a6b;
            --primary-light: #2a5a9e;
            --primary-dark: #0f2444;
            --accent: #e8b830;
            --accent-light: #f0d060;
            --accent-dark: #c9a020;
            --bg-dark: #0b1424;
            --bg-card: #111d33;
            --bg-section: #0f1a2e;
            --bg-body: #080f1c;
            --text-light: #f0f4fc;
            --text-muted: #8a9bb5;
            --text-dim: #5a6f8a;
            --border-color: rgba(232, 184, 48, 0.15);
            --border-light: rgba(255, 255, 255, 0.06);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
            --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.4);
            --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.5);
            --shadow-glow: 0 0 30px rgba(232, 184, 48, 0.08);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --transition: 0.25s ease;
            --max-width: 1200px;
            --header-h: 72px;
        }

        /* ===== 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-sans);
            background: var(--bg-body);
            color: var(--text-light);
            line-height: 1.7;
            font-size: 16px;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent-light);
        }
        a:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
            border-radius: 4px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: 1rem;
            border: none;
            outline: none;
        }
        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.25;
            font-weight: 700;
            color: var(--text-light);
        }
        h1 {
            font-size: 2.4rem;
        }
        h2 {
            font-size: 1.8rem;
        }
        h3 {
            font-size: 1.35rem;
        }
        h4 {
            font-size: 1.1rem;
        }
        p {
            color: var(--text-muted);
            margin-bottom: 0.85rem;
        }

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

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(11, 20, 36, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border-light);
            height: var(--header-h);
            display: flex;
            align-items: center;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--text-light);
            letter-spacing: -0.5px;
            flex-shrink: 0;
        }
        .logo .logo-icon {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--bg-dark);
            box-shadow: 0 0 20px rgba(232, 184, 48, 0.2);
        }
        .logo span {
            background: linear-gradient(135deg, var(--text-light), var(--accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-list a {
            display: flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: 30px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-muted);
            transition: all var(--transition);
            white-space: nowrap;
        }
        .nav-list a i {
            font-size: 0.85rem;
        }
        .nav-list a:hover {
            color: var(--text-light);
            background: rgba(255, 255, 255, 0.06);
        }
        .nav-list a.active {
            color: var(--bg-dark);
            background: var(--accent);
            box-shadow: 0 0 20px rgba(232, 184, 48, 0.25);
        }
        .nav-list a.active:hover {
            background: var(--accent-light);
        }
        .nav-toggle {
            display: none;
            background: none;
            color: var(--text-light);
            font-size: 1.6rem;
            padding: 4px 8px;
            cursor: pointer;
            border-radius: 8px;
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.06);
        }

        /* ===== Article Banner ===== */
        .article-banner {
            position: relative;
            padding: 80px 0 60px;
            background: linear-gradient(160deg, var(--bg-dark) 0%, var(--bg-section) 60%, var(--bg-dark) 100%);
            border-bottom: 1px solid var(--border-light);
            overflow: hidden;
        }
        .article-banner::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.08;
            pointer-events: none;
        }
        .article-banner .container {
            position: relative;
            z-index: 2;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 12px 20px;
            margin-bottom: 20px;
        }
        .article-meta .badge {
            display: inline-block;
            padding: 4px 16px;
            border-radius: 30px;
            font-size: 0.8rem;
            font-weight: 600;
            background: rgba(232, 184, 48, 0.15);
            color: var(--accent);
            border: 1px solid rgba(232, 184, 48, 0.2);
        }
        .article-meta .date {
            font-size: 0.85rem;
            color: var(--text-dim);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta .date i {
            color: var(--accent);
        }
        .article-banner h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            max-width: 900px;
            background: linear-gradient(135deg, var(--text-light) 60%, var(--accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 16px;
        }
        .article-banner p.desc {
            font-size: 1.1rem;
            color: var(--text-muted);
            max-width: 720px;
            line-height: 1.7;
        }

        /* ===== Article Content ===== */
        .article-main {
            padding: 60px 0 80px;
            background: var(--bg-body);
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 48px;
            align-items: start;
        }
        .article-body {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 40px 44px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-md);
        }
        .article-body .content {
            font-size: 1.05rem;
            line-height: 1.9;
            color: var(--text-muted);
        }
        .article-body .content p {
            margin-bottom: 1.2rem;
        }
        .article-body .content h2,
        .article-body .content h3 {
            margin-top: 2rem;
            margin-bottom: 1rem;
            color: var(--text-light);
        }
        .article-body .content ul,
        .article-body .content ol {
            margin-bottom: 1.2rem;
            padding-left: 1.5rem;
            list-style: disc;
            color: var(--text-muted);
        }
        .article-body .content li {
            margin-bottom: 0.4rem;
        }
        .article-body .content a {
            color: var(--accent);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-body .content a:hover {
            color: var(--accent-light);
        }
        .article-body .content blockquote {
            border-left: 4px solid var(--accent);
            padding: 16px 24px;
            margin: 1.5rem 0;
            background: rgba(232, 184, 48, 0.05);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-muted);
            font-style: italic;
        }
        .article-body .content img {
            border-radius: var(--radius-md);
            margin: 1.5rem 0;
            box-shadow: var(--shadow-sm);
        }
        .article-body .content pre {
            background: rgba(0, 0, 0, 0.4);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            overflow-x: auto;
            margin: 1.5rem 0;
            border: 1px solid var(--border-light);
            font-size: 0.9rem;
            color: var(--text-light);
        }
        .article-body .content code {
            font-family: 'JetBrains Mono', 'Fira Code', monospace;
            font-size: 0.9em;
        }
        .article-not-found {
            text-align: center;
            padding: 80px 20px;
        }
        .article-not-found i {
            font-size: 3.6rem;
            color: var(--text-dim);
            margin-bottom: 20px;
            display: block;
        }
        .article-not-found h2 {
            font-size: 1.8rem;
            margin-bottom: 12px;
        }
        .article-not-found p {
            font-size: 1.1rem;
            color: var(--text-dim);
            margin-bottom: 24px;
        }
        .article-not-found .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: 30px;
            background: var(--accent);
            color: var(--bg-dark);
            font-weight: 600;
            transition: all var(--transition);
        }
        .article-not-found .btn-back:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(232, 184, 48, 0.3);
        }

        /* ===== Sidebar ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 24px 22px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
        }
        .sidebar-card h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 16px;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border-light);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sidebar-card h4 i {
            color: var(--accent);
            font-size: 0.9rem;
        }
        .sidebar-card ul li {
            margin-bottom: 10px;
        }
        .sidebar-card ul li a {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--text-muted);
            padding: 6px 0;
            transition: all var(--transition);
        }
        .sidebar-card ul li a i {
            font-size: 0.7rem;
            color: var(--accent);
            transition: transform var(--transition);
        }
        .sidebar-card ul li a:hover {
            color: var(--text-light);
        }
        .sidebar-card ul li a:hover i {
            transform: translateX(4px);
        }
        .sidebar-cover {
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
        }
        .sidebar-cover img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 0;
        }

        /* ===== CTA Section ===== */
        .article-cta {
            padding: 60px 0;
            background: linear-gradient(160deg, var(--bg-section), var(--bg-dark));
            border-top: 1px solid var(--border-light);
            border-bottom: 1px solid var(--border-light);
            text-align: center;
        }
        .article-cta h2 {
            font-size: 2rem;
            margin-bottom: 12px;
        }
        .article-cta p {
            font-size: 1.1rem;
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto 28px;
        }
        .article-cta .btn-group {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            border-radius: 30px;
            background: var(--accent);
            color: var(--bg-dark);
            font-weight: 700;
            font-size: 1rem;
            transition: all var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn-primary:hover {
            background: var(--accent-light);
            transform: translateY(-3px);
            box-shadow: 0 12px 35px rgba(232, 184, 48, 0.3);
            color: var(--bg-dark);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            border-radius: 30px;
            background: transparent;
            color: var(--text-light);
            font-weight: 600;
            font-size: 1rem;
            border: 1.5px solid rgba(255, 255, 255, 0.15);
            transition: all var(--transition);
            cursor: pointer;
        }
        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
            background: rgba(232, 184, 48, 0.06);
            transform: translateY(-3px);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            border-top: 1px solid var(--border-light);
            padding: 60px 0 30px;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid var(--border-light);
        }
        .footer-brand .logo {
            margin-bottom: 14px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: var(--text-dim);
            max-width: 360px;
            line-height: 1.7;
        }
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            font-size: 0.88rem;
            color: var(--text-dim);
            display: flex;
            align-items: center;
            gap: 6px;
            transition: all var(--transition);
        }
        .footer-col ul li a i {
            font-size: 0.65rem;
            color: var(--accent);
            transition: transform var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--text-light);
        }
        .footer-col ul li a:hover i {
            transform: translateX(4px);
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            gap: 12px;
        }
        .footer-bottom p {
            font-size: 0.82rem;
            color: var(--text-dim);
            margin: 0;
        }
        .footer-bottom-links {
            display: flex;
            gap: 20px;
        }
        .footer-bottom-links a {
            font-size: 0.82rem;
            color: var(--text-dim);
            transition: color var(--transition);
        }
        .footer-bottom-links a:hover {
            color: var(--text-light);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .article-sidebar {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
            .article-banner h1 {
                font-size: 2.2rem;
            }
        }
        @media (max-width: 768px) {
            :root {
                --header-h: 64px;
            }
            .container {
                padding: 0 16px;
            }
            .nav-list {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(11, 20, 36, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 16px 20px;
                gap: 4px;
                border-bottom: 1px solid var(--border-light);
                transform: translateY(-110%);
                opacity: 0;
                transition: all 0.35s ease;
                pointer-events: none;
                box-shadow: var(--shadow-lg);
                border-radius: 0 0 var(--radius-lg) var(--radius-lg);
            }
            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-list a {
                width: 100%;
                padding: 12px 18px;
                border-radius: 10px;
                font-size: 1rem;
            }
            .nav-toggle {
                display: block;
            }
            .article-banner {
                padding: 48px 0 40px;
            }
            .article-banner h1 {
                font-size: 1.8rem;
            }
            .article-banner p.desc {
                font-size: 0.95rem;
            }
            .article-body {
                padding: 24px 20px;
            }
            .article-body .content {
                font-size: 1rem;
            }
            .article-sidebar {
                grid-template-columns: 1fr;
            }
            .article-cta h2 {
                font-size: 1.5rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .footer-bottom-links {
                justify-content: center;
            }
        }
        @media (max-width: 520px) {
            .article-banner h1 {
                font-size: 1.5rem;
            }
            .article-meta {
                gap: 8px 14px;
            }
            .article-meta .badge {
                font-size: 0.72rem;
                padding: 3px 12px;
            }
            .article-body {
                padding: 18px 14px;
                border-radius: var(--radius-md);
            }
            .article-body .content {
                font-size: 0.95rem;
            }
            .btn-primary,
            .btn-outline {
                width: 100%;
                justify-content: center;
                padding: 14px 20px;
            }
            .article-cta .btn-group {
                flex-direction: column;
                gap: 12px;
            }
            .logo {
                font-size: 1.2rem;
            }
            .logo .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 1.1rem;
            }
            .sidebar-cover img {
                height: 140px;
            }
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #0b1a2f;
            --primary-light: #11294a;
            --primary-dark: #060f1b;
            --accent: #f0b90b;
            --accent-light: #fcd34d;
            --accent-dark: #c9950a;
            --bg-body: #f4f7fc;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-dark: #0b1a2f;
            --text-primary: #0b1a2f;
            --text-secondary: #2d4059;
            --text-muted: #6b7c93;
            --text-light: #ffffff;
            --text-accent: #f0b90b;
            --border-color: #e2e8f0;
            --border-light: #f0f2f5;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --shadow-sm: 0 2px 8px rgba(11, 26, 47, 0.06);
            --shadow-md: 0 6px 24px rgba(11, 26, 47, 0.10);
            --shadow-lg: 0 16px 48px rgba(11, 26, 47, 0.14);
            --shadow-btn: 0 4px 14px rgba(240, 185, 11, 0.35);
            --transition: all 0.25s ease;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --container-width: 1200px;
            --header-height: 72px;
        }

        /* ===== 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-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            min-height: 100vh;
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            outline: none;
            border: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text-primary);
        }

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

        /* ===== Header & Navigation ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            height: var(--header-height);
            display: flex;
            align-items: center;
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 800;
            color: var(--primary);
            text-decoration: none;
            letter-spacing: -0.3px;
        }
        .logo:hover {
            color: var(--primary);
        }
        .logo-icon {
            width: 38px;
            height: 38px;
            background: var(--accent);
            color: var(--primary);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 700;
            box-shadow: 0 2px 8px rgba(240, 185, 11, 0.3);
        }
        .logo span {
            color: var(--primary);
        }

        .nav-list {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-list a {
            position: relative;
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 10px 20px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            text-decoration: none;
        }
        .nav-list a i {
            font-size: 14px;
            color: var(--text-muted);
            transition: var(--transition);
        }
        .nav-list a:hover {
            background: rgba(240, 185, 11, 0.08);
            color: var(--primary);
        }
        .nav-list a:hover i {
            color: var(--accent);
        }
        .nav-list a.active {
            background: var(--accent);
            color: var(--primary);
            font-weight: 600;
            box-shadow: 0 2px 10px rgba(240, 185, 11, 0.25);
        }
        .nav-list a.active i {
            color: var(--primary);
        }

        /* Mobile Menu Toggle */
        .menu-toggle {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background: transparent;
            border: 1px solid var(--border-color);
            cursor: pointer;
            transition: var(--transition);
        }
        .menu-toggle span {
            display: block;
            width: 22px;
            height: 2.5px;
            background: var(--text-primary);
            border-radius: 4px;
            margin: 3px 0;
            transition: var(--transition);
        }
        .menu-toggle:hover {
            border-color: var(--accent);
        }
        .menu-toggle.active span:nth-child(1) {
            transform: translateY(8.5px) rotate(45deg);
        }
        .menu-toggle.active span:nth-child(2) {
            opacity: 0;
        }
        .menu-toggle.active span:nth-child(3) {
            transform: translateY(-8.5px) rotate(-45deg);
        }

        /* ===== Hero / Banner ===== */
        .category-hero {
            position: relative;
            padding: 80px 0 72px;
            background: var(--primary);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 26, 47, 0.88) 0%, rgba(11, 26, 47, 0.60) 100%);
            z-index: 1;
        }
        .category-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .category-hero h1 {
            font-size: 44px;
            font-weight: 800;
            color: var(--text-light);
            letter-spacing: -0.5px;
            margin-bottom: 16px;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
        }
        .category-hero h1 i {
            color: var(--accent);
            margin-right: 10px;
        }
        .category-hero p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 680px;
            margin: 0 auto;
            line-height: 1.7;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(240, 185, 11, 0.15);
            border: 1px solid rgba(240, 185, 11, 0.25);
            color: var(--accent);
            padding: 6px 18px;
            border-radius: 50px;
            font-size: 14px;
            font-weight: 500;
            margin-bottom: 20px;
            backdrop-filter: blur(4px);
        }

        /* ===== Section Shared ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-white);
        }
        .section-dark {
            background: var(--primary);
            color: var(--text-light);
        }
        .section-dark h2,
        .section-dark h3,
        .section-dark .section-subtitle {
            color: var(--text-light);
        }
        .section-header {
            text-align: center;
            margin-bottom: 52px;
        }
        .section-header h2 {
            font-size: 32px;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.3px;
            margin-bottom: 12px;
        }
        .section-header h2 i {
            color: var(--accent);
            margin-right: 8px;
        }
        .section-subtitle {
            font-size: 17px;
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.7;
        }
        .section-dark .section-header h2 {
            color: var(--text-light);
        }
        .section-dark .section-subtitle {
            color: rgba(255, 255, 255, 0.7);
        }

        /* ===== Guide Cards Grid ===== */
        .guide-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .guide-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;
        }
        .guide-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: var(--accent);
        }
        .guide-card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            background: var(--primary-light);
            display: block;
        }
        .guide-card-body {
            padding: 28px 24px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .guide-card-body .tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(240, 185, 11, 0.12);
            color: var(--accent-dark);
            font-size: 13px;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 50px;
            margin-bottom: 12px;
            width: fit-content;
        }
        .guide-card-body h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 10px;
        }
        .guide-card-body p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            flex: 1;
            margin-bottom: 16px;
        }
        .guide-card-body .guide-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 13px;
            color: var(--text-muted);
            border-top: 1px solid var(--border-light);
            padding-top: 16px;
            margin-top: auto;
        }
        .guide-card-body .guide-meta i {
            color: var(--accent);
        }
        .guide-card-body .btn-outline {
            align-self: flex-start;
            margin-top: 8px;
        }

        /* ===== Step / Process ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            counter-reset: step-counter;
        }
        .step-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 24px 28px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            position: relative;
        }
        .step-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .step-item .step-number {
            width: 52px;
            height: 52px;
            background: var(--accent);
            color: var(--primary);
            font-size: 22px;
            font-weight: 800;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            box-shadow: 0 4px 14px rgba(240, 185, 11, 0.3);
        }
        .step-item h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-primary);
        }
        .step-item p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .step-item .step-icon {
            font-size: 28px;
            color: var(--accent);
            margin-bottom: 12px;
        }

        /* ===== 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: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--accent);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 18px 22px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            background: transparent;
            text-align: left;
            transition: var(--transition);
        }
        .faq-question:hover {
            background: rgba(240, 185, 11, 0.04);
        }
        .faq-question i {
            color: var(--accent);
            font-size: 18px;
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-question.open i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.3s ease;
            padding: 0 22px;
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.7;
            border-top: 0px solid var(--border-color);
        }
        .faq-answer.open {
            max-height: 300px;
            padding: 16px 22px 22px;
            border-top-width: 1px;
        }
        .faq-answer p {
            margin-bottom: 8px;
        }
        .faq-answer p:last-child {
            margin-bottom: 0;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            position: relative;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 26, 47, 0.85) 0%, rgba(11, 26, 47, 0.65) 100%);
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 72px 24px;
        }
        .cta-section h2 {
            font-size: 32px;
            font-weight: 800;
            color: var(--text-light);
            margin-bottom: 14px;
        }
        .cta-section h2 i {
            color: var(--accent);
        }
        .cta-section p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.8);
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 13px 32px;
            border-radius: 50px;
            font-size: 16px;
            font-weight: 600;
            transition: var(--transition);
            text-decoration: none;
            border: none;
            line-height: 1.2;
        }
        .btn-primary {
            background: var(--accent);
            color: var(--primary);
            box-shadow: var(--shadow-btn);
        }
        .btn-primary:hover {
            background: var(--accent-light);
            color: var(--primary);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(240, 185, 11, 0.4);
        }
        .btn-outline {
            background: transparent;
            color: var(--accent);
            border: 2px solid var(--accent);
            padding: 11px 28px;
        }
        .btn-outline:hover {
            background: var(--accent);
            color: var(--primary);
            transform: translateY(-2px);
        }
        .btn-light {
            background: var(--bg-white);
            color: var(--primary);
        }
        .btn-light:hover {
            background: var(--accent-light);
            color: var(--primary);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 8px 20px;
            font-size: 14px;
        }

        /* ===== Tags ===== */
        .tags-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 32px;
        }
        .tags-cloud .tag-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            padding: 8px 18px;
            border-radius: 50px;
            font-size: 14px;
            font-weight: 500;
            transition: var(--transition);
        }
        .tags-cloud .tag-item:hover {
            border-color: var(--accent);
            background: rgba(240, 185, 11, 0.06);
            color: var(--primary);
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }
        .tags-cloud .tag-item i {
            color: var(--accent);
            font-size: 13px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.75);
            padding: 56px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            color: var(--text-light);
            margin-bottom: 16px;
        }
        .footer-brand .logo span {
            color: var(--text-light);
        }
        .footer-brand p {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.7;
            margin-top: 8px;
        }
        .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 18px;
            letter-spacing: 0.3px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 14px;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .footer-col ul li a i {
            font-size: 10px;
            color: var(--accent);
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: var(--accent);
        }
        .footer-col ul li a:hover i {
            transform: translateX(4px);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 24px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom-links {
            display: flex;
            gap: 20px;
        }
        .footer-bottom-links a {
            color: rgba(255, 255, 255, 0.5);
            font-size: 14px;
            transition: var(--transition);
        }
        .footer-bottom-links a:hover {
            color: var(--accent);
        }

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

        @media (max-width: 768px) {
            :root {
                --header-height: 64px;
            }
            .menu-toggle {
                display: flex;
            }
            .nav-list {
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: var(--bg-white);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                box-shadow: 0 12px 32px rgba(0, 0, 0, 0.10);
                border-bottom: 1px solid var(--border-color);
                transform: translateY(-10px);
                opacity: 0;
                visibility: hidden;
                pointer-events: none;
                transition: var(--transition);
                border-radius: 0 0 var(--radius-md) var(--radius-md);
            }
            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
                pointer-events: all;
            }
            .nav-list a {
                width: 100%;
                padding: 12px 18px;
                font-size: 16px;
                border-radius: var(--radius-sm);
            }
            .category-hero h1 {
                font-size: 30px;
            }
            .category-hero p {
                font-size: 16px;
            }
            .section-header h2 {
                font-size: 26px;
            }
            .guide-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-section h2 {
                font-size: 26px;
            }
            .cta-buttons .btn {
                width: 100%;
                justify-content: center;
            }
            .section {
                padding: 56px 0;
            }
            .category-hero {
                padding: 56px 0 48px;
                min-height: 240px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .category-hero h1 {
                font-size: 24px;
            }
            .category-hero h1 i {
                display: none;
            }
            .section-header h2 {
                font-size: 22px;
            }
            .guide-card-body h3 {
                font-size: 18px;
            }
            .step-item {
                padding: 24px 18px 22px;
            }
            .faq-question {
                font-size: 15px;
                padding: 14px 16px;
            }
            .tags-cloud .tag-item {
                font-size: 13px;
                padding: 6px 14px;
            }
            .footer-col h4 {
                font-size: 15px;
            }
        }