/* roulang page: index */
/* ===== 设计变量 ===== */
:root {
  --primary: #0f2b4b;
  --primary-light: #1a3f6a;
  --primary-dark: #091c32;
  --accent: #e84c3d;
  --accent-hover: #d43a2b;
  --accent-light: #fde8e5;
  --bg: #f5f7fa;
  --bg-white: #ffffff;
  --bg-dark: #0a1628;
  --bg-card: #ffffff;
  --text: #1e2a3a;
  --text-light: #5a6a7e;
  --text-white: #f0f4f8;
  --border: #e2e8f0;
  --border-light: #f0f2f5;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.10);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.12);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --max-width: 1240px;
  --header-height: 72px;
  --spacing-section: 5rem;
  --spacing-block: 2.5rem;
}
/* ===== 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);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
}
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent); }
img { max-width: 100%; height: auto; display: block; }
button, input, textarea { font-family: inherit; font-size: inherit; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--primary); }
h1 { font-size: 2.8rem; }
h2 { font-size: 2.2rem; margin-bottom: 1rem; }
h3 { font-size: 1.4rem; }
h4 { font-size: 1.15rem; }
p { margin-bottom: 1rem; color: var(--text-light); }
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}
/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 2rem;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: 0.3px;
  text-align: center;
  justify-content: center;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 16px rgba(232, 76, 61, 0.30);
}
.btn-primary:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(232, 76, 61, 0.40);
}
.btn-outline {
  background: transparent;
  color: var(--text-white);
  border: 2px solid rgba(255,255,255,0.5);
}
.btn-outline:hover {
  border-color: #fff;
  color: #fff;
  transform: translateY(-2px);
  background: rgba(255,255,255,0.08);
}
.btn-light {
  background: var(--bg-white);
  color: var(--primary);
  box-shadow: var(--shadow);
}
.btn-light:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
}
/* ===== 标签 / Badge ===== */
.badge {
  display: inline-block;
  padding: 0.25rem 0.9rem;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.3px;
  background: var(--accent-light);
  color: var(--accent);
}
.badge-primary {
  background: var(--primary);
  color: #fff;
}
.badge-white {
  background: rgba(255,255,255,0.18);
  color: #fff;
  backdrop-filter: blur(4px);
}
/* ===== Header / Nav ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: var(--transition);
}
.header.scrolled {
  box-shadow: var(--shadow);
  background: rgba(255,255,255,0.98);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.logo {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.logo i { color: var(--accent); font-size: 1.6rem; }
.logo span { color: var(--accent); }
.nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-light);
  padding: 0.4rem 0;
  position: relative;
  transition: var(--transition);
}
.nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: 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%; background: var(--accent); }
.nav-right {
  display: flex;
  align-items: center;
  gap: 1.2rem;
}
.search-box {
  display: flex;
  align-items: center;
  background: var(--bg);
  border-radius: 50px;
  padding: 0.35rem 1rem 0.35rem 1.2rem;
  border: 1px solid var(--border);
  transition: var(--transition);
}
.search-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(232,76,61,0.12);
}
.search-box input {
  border: none;
  background: transparent;
  padding: 0.4rem 0;
  outline: none;
  color: var(--text);
  width: 160px;
  font-size: 0.88rem;
}
.search-box input::placeholder { color: var(--text-light); }
.search-box button {
  border: none;
  background: transparent;
  color: var(--text-light);
  cursor: pointer;
  font-size: 1rem;
  padding: 0.2rem;
  transition: var(--transition);
}
.search-box button:hover { color: var(--accent); }
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.6rem;
  color: var(--primary);
  cursor: pointer;
  padding: 0.3rem;
}
/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  margin-top: var(--header-height);
  background: var(--bg-dark);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
  opacity: 0.55;
  transition: transform 0.6s ease;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10,22,40,0.88) 0%, rgba(10,22,40,0.50) 50%, rgba(10,22,40,0.70) 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 780px;
  padding: 3rem 0;
}
.hero-content .badge {
  margin-bottom: 1.2rem;
}
.hero-content h1 {
  font-size: 3.6rem;
  font-weight: 800;
  color: var(--text-white);
  line-height: 1.15;
  margin-bottom: 1.2rem;
  letter-spacing: -1px;
}
.hero-content h1 span {
  background: linear-gradient(135deg, var(--accent), #f0976a);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-content p {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.75);
  max-width: 600px;
  margin-bottom: 2rem;
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.hero-stats {
  display: flex;
  gap: 2.5rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid rgba(255,255,255,0.10);
}
.hero-stat-item {
  text-align: center;
}
.hero-stat-item .num {
  font-size: 2rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
}
.hero-stat-item .label {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.55);
  letter-spacing: 0.5px;
}
/* ===== Section通用 ===== */
.section {
  padding: var(--spacing-section) 0;
}
.section-title {
  text-align: center;
  margin-bottom: 3rem;
}
.section-title h2 {
  margin-bottom: 0.6rem;
}
.section-title p {
  max-width: 600px;
  margin: 0 auto;
  font-size: 1.05rem;
  color: var(--text-light);
}
.section-dark {
  background: var(--bg-dark);
  color: var(--text-white);
}
.section-dark .section-title h2 { color: #fff; }
.section-dark .section-title p { color: rgba(255,255,255,0.6); }
/* ===== 卡片网格 ===== */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.8rem;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}
/* ===== Card ===== */
.card {
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: var(--transition);
  border: 1px solid var(--border-light);
}
.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: transparent;
}
.card-img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  display: block;
}
.card-body {
  padding: 1.5rem 1.6rem 1.8rem;
}
.card-body .badge { margin-bottom: 0.6rem; }
.card-body h3 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
  color: var(--primary);
  line-height: 1.4;
}
.card-body h3 a { color: inherit; }
.card-body h3 a:hover { color: var(--accent); }
.card-body p {
  font-size: 0.92rem;
  color: var(--text-light);
  margin-bottom: 0;
  line-height: 1.6;
}
.card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 0.8rem;
  font-size: 0.8rem;
  color: var(--text-light);
}
.card-meta i { margin-right: 0.3rem; }
/* ===== 特色卡片（icon） ===== */
.feature-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 2.2rem 1.8rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-light);
  transition: var(--transition);
  text-align: center;
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}
.feature-card .icon {
  width: 64px;
  height: 64px;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.2rem;
  font-size: 1.8rem;
  transition: var(--transition);
}
.feature-card:hover .icon {
  background: var(--accent);
  color: #fff;
}
.feature-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.6rem;
}
.feature-card p {
  font-size: 0.92rem;
  color: var(--text-light);
  margin-bottom: 0;
}
/* ===== 分类入口 ===== */
.category-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  min-height: 240px;
  display: flex;
  align-items: flex-end;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow);
}
.category-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}
.category-card img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.category-card .overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(0deg, rgba(10,22,40,0.82) 0%, rgba(10,22,40,0.15) 70%);
  transition: var(--transition);
}
.category-card:hover .overlay {
  background: linear-gradient(0deg, rgba(10,22,40,0.90) 0%, rgba(10,22,40,0.25) 70%);
}
.category-card .info {
  position: relative;
  z-index: 2;
  padding: 1.8rem 1.6rem;
  width: 100%;
}
.category-card .info h3 {
  color: #fff;
  font-size: 1.3rem;
  margin-bottom: 0.3rem;
}
.category-card .info p {
  color: rgba(255,255,255,0.7);
  font-size: 0.88rem;
  margin-bottom: 0;
}
.category-card .info .badge {
  margin-bottom: 0.6rem;
}
/* ===== 内容列表 ===== */
.content-list {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}
.list-item {
  display: flex;
  align-items: flex-start;
  gap: 1.2rem;
  padding: 1rem 1.2rem;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  transition: var(--transition);
}
.list-item:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
  transform: translateX(4px);
}
.list-item .rank {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--border);
  min-width: 40px;
  line-height: 1.2;
}
.list-item .rank.active { color: var(--accent); }
.list-item .info { flex: 1; }
.list-item .info h4 {
  font-size: 1rem;
  margin-bottom: 0.2rem;
}
.list-item .info h4 a { color: var(--primary); }
.list-item .info h4 a:hover { color: var(--accent); }
.list-item .info p {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-bottom: 0;
}
.list-item .meta {
  font-size: 0.78rem;
  color: var(--text-light);
  white-space: nowrap;
}
/* ===== 数据/流程 ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}
.stat-card {
  text-align: center;
  padding: 2rem 1.5rem;
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.08);
  transition: var(--transition);
}
.stat-card:hover {
  background: rgba(255,255,255,0.08);
  transform: translateY(-4px);
}
.stat-card .num {
  font-size: 2.6rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 0.3rem;
}
.stat-card .num span { color: var(--accent); }
.stat-card .label {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.55);
}
/* ===== 流程步骤 ===== */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  position: relative;
}
.step-card {
  text-align: center;
  padding: 2rem 1.5rem;
  background: var(--bg-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border-light);
  transition: var(--transition);
  position: relative;
}
.step-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.step-card .step-num {
  width: 48px;
  height: 48px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 auto 1rem;
}
.step-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.step-card p { font-size: 0.9rem; color: var(--text-light); margin-bottom: 0; }
/* ===== FAQ ===== */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}
.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover { border-color: var(--border); }
.faq-question {
  width: 100%;
  padding: 1.2rem 1.6rem;
  background: none;
  border: none;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--primary);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  transition: var(--transition);
}
.faq-question:hover { color: var(--accent); }
.faq-question i {
  font-size: 0.9rem;
  color: var(--text-light);
  transition: var(--transition);
}
.faq-item.open .faq-question i { transform: rotate(180deg); color: var(--accent); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease, padding 0.35s ease;
  padding: 0 1.6rem;
}
.faq-item.open .faq-answer {
  max-height: 300px;
  padding: 0 1.6rem 1.2rem;
}
.faq-answer p {
  font-size: 0.92rem;
  color: var(--text-light);
  margin-bottom: 0;
}
/* ===== CTA ===== */
.cta-section {
  text-align: center;
  padding: 4rem 2rem;
  background: var(--primary);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
  opacity: 0.10;
}
.cta-section h2 {
  color: #fff;
  font-size: 2.2rem;
  margin-bottom: 0.8rem;
  position: relative;
}
.cta-section p {
  color: rgba(255,255,255,0.7);
  max-width: 540px;
  margin: 0 auto 2rem;
  font-size: 1.05rem;
  position: relative;
}
.cta-section .btn {
  position: relative;
}
/* ===== Footer ===== */
.footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 4rem 0 2rem;
  border-top: 1px solid rgba(255,255,255,0.05);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}
.footer-brand .logo {
  color: #fff;
  margin-bottom: 1rem;
}
.footer-brand p {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.5);
  max-width: 320px;
  margin-bottom: 1.2rem;
}
.footer-social {
  display: flex;
  gap: 0.8rem;
}
.footer-social a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  color: rgba(255,255,255,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: var(--transition);
}
.footer-social a:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-3px);
}
.footer-col h4 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: 1.2rem;
}
.footer-col a {
  display: block;
  color: rgba(255,255,255,0.5);
  font-size: 0.88rem;
  padding: 0.35rem 0;
  transition: var(--transition);
}
.footer-col a:hover { color: var(--accent); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 1.8rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.35);
}
.footer-bottom a { color: rgba(255,255,255,0.4); }
.footer-bottom a:hover { color: var(--accent); }
/* ===== 图片遮罩效果 ===== */
.img-mask {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
}
.img-mask img {
  transition: transform 0.6s ease;
}
.img-mask:hover img {
  transform: scale(1.05);
}
.img-mask .mask-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(0deg, rgba(10,22,40,0.5) 0%, transparent 60%);
  opacity: 0;
  transition: var(--transition);
}
.img-mask:hover .mask-overlay {
  opacity: 1;
}
/* ===== 分隔线 ===== */
.divider {
  width: 60px;
  height: 3px;
  background: var(--accent);
  border-radius: 4px;
  margin: 0.8rem auto 1.2rem;
}
/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-content h1 { font-size: 2.8rem; }
}
@media (max-width: 768px) {
  :root { --spacing-section: 3rem; --header-height: 64px; }
  .nav { display: none; }
  .nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(16px);
    padding: 1.2rem 1.5rem;
    gap: 0.8rem;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }
  .nav.open a { padding: 0.6rem 0; }
  .nav-right .search-box { display: none; }
  .mobile-toggle { display: block; }
  .hero { min-height: 80vh; }
  .hero-content h1 { font-size: 2.2rem; }
  .hero-content p { font-size: 1rem; }
  .hero-stats { gap: 1.5rem; flex-wrap: wrap; }
  .hero-stat-item .num { font-size: 1.5rem; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; gap: 1.2rem; }
  .section-title h2 { font-size: 1.8rem; }
  .cta-section h2 { font-size: 1.6rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .content-list .list-item { flex-wrap: wrap; }
  .list-item .meta { white-space: normal; }
}
@media (max-width: 520px) {
  .hero-content h1 { font-size: 1.8rem; }
  .grid-4 { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr; }
  .hero-actions .btn { width: 100%; }
  .hero-stats { flex-direction: column; gap: 1rem; }
  .hero-stat-item { text-align: left; display: flex; gap: 0.8rem; align-items: baseline; }
}
/* ===== 工具类 ===== */
.text-center { text-align: center; }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.gap-1 { gap: 1rem; }
.flex-center { display: flex; align-items: center; justify-content: center; }

/* roulang page: category1 */
:root {
            --primary: #1a56db;
            --primary-dark: #0f3a8e;
            --primary-light: #3b82f6;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --bg-body: #f8fafc;
            --bg-white: #ffffff;
            --bg-dark: #0f172a;
            --bg-gray: #f1f5f9;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-white: #ffffff;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --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 20px 50px rgba(0, 0, 0, 0.12);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --container: 1200px;
            --spacing-section: 5rem;
        }

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

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

        body {
            font-family: var(--font-sans);
            color: var(--text-primary);
            background: var(--bg-body);
            line-height: 1.7;
            font-size: 1rem;
        }

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

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

        a:hover {
            color: var(--primary);
        }

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

        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        /* ===== Header & Navigation ===== */
        .header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.04);
            transition: var(--transition);
        }

        .header.scrolled {
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.08);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0.75rem 0;
            gap: 1.5rem;
        }

        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--text-primary);
            display: flex;
            align-items: center;
            gap: 0.5rem;
            letter-spacing: -0.02em;
            flex-shrink: 0;
        }

        .logo i {
            color: var(--primary);
            font-size: 1.6rem;
        }

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

        .nav {
            display: flex;
            align-items: center;
            gap: 0.25rem;
            flex-wrap: wrap;
        }

        .nav a {
            padding: 0.5rem 1rem;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
        }

        .nav a:hover {
            color: var(--primary);
            background: rgba(26, 86, 219, 0.06);
        }

        .nav a.active {
            color: var(--primary);
            background: rgba(26, 86, 219, 0.10);
            font-weight: 600;
        }

        .nav a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60%;
            height: 3px;
            background: var(--primary);
            border-radius: 2px;
        }

        .nav-cta {
            background: var(--primary) !important;
            color: #fff !important;
            padding: 0.5rem 1.25rem !important;
            border-radius: var(--radius-sm) !important;
            font-weight: 600 !important;
            box-shadow: 0 4px 14px rgba(26, 86, 219, 0.25);
        }

        .nav-cta:hover {
            background: var(--primary-dark) !important;
            box-shadow: 0 6px 24px rgba(26, 86, 219, 0.35) !important;
            transform: translateY(-1px);
            color: #fff !important;
        }

        .nav-toggle {
            display: none;
            background: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            cursor: pointer;
            padding: 0.25rem;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }

        .nav-toggle:hover {
            background: var(--bg-gray);
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            padding: 1.25rem 0 0.5rem;
            font-size: 0.875rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 0.5rem;
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--text-secondary);
        }

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

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

        .breadcrumb i {
            font-size: 0.7rem;
            color: var(--text-muted);
        }

        /* ===== Page Hero Banner ===== */
        .page-hero {
            position: relative;
            min-height: 320px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
            overflow: hidden;
            border-radius: 0 0 var(--radius-lg) var(--radius-lg);
            margin-bottom: 1rem;
        }

        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.25;
            mix-blend-mode: overlay;
            z-index: 0;
        }

        .page-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(15, 23, 42, 0.9) 0%, rgba(15, 23, 42, 0.4) 100%);
            z-index: 1;
        }

        .page-hero-content {
            position: relative;
            z-index: 2;
            padding: 3rem 1.5rem;
            max-width: 800px;
        }

        .page-hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.03em;
            line-height: 1.2;
            margin-bottom: 1rem;
            text-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
        }

        .page-hero p {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 600px;
            margin: 0 auto 1.5rem;
            line-height: 1.8;
        }

        .page-hero .hero-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 0.6rem;
            justify-content: center;
        }

        .page-hero .hero-tags span {
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(6px);
            padding: 0.35rem 1rem;
            border-radius: 50px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.9);
            border: 1px solid rgba(255, 255, 255, 0.10);
        }

        /* ===== Sections ===== */
        .section {
            padding: var(--spacing-section) 0;
        }

        .section-sm {
            padding: 3rem 0;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 0.75rem;
            letter-spacing: -0.02em;
            line-height: 1.3;
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 640px;
            margin-bottom: 2.5rem;
            line-height: 1.8;
        }

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

        .mx-auto {
            margin-left: auto;
            margin-right: auto;
        }

        /* ===== Card Grid ===== */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.75rem;
        }

        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.75rem;
        }

        .card {
            background: var(--bg-white);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
        }

        .card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }

        .card-img {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
            display: block;
        }

        .card-body {
            padding: 1.5rem;
        }

        .card-body h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            line-height: 1.4;
        }

        .card-body p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 0.75rem;
        }

        .card-tag {
            display: inline-block;
            background: rgba(26, 86, 219, 0.08);
            color: var(--primary);
            padding: 0.2rem 0.75rem;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
        }

        .card-link {
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            font-size: 0.9rem;
        }

        .card-link i {
            font-size: 0.75rem;
            transition: var(--transition);
        }

        .card-link:hover i {
            transform: translateX(4px);
        }

        /* ===== Step Flow ===== */
        .step-flow {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            counter-reset: step;
        }

        .step-item {
            text-align: center;
            position: relative;
            padding: 2rem 1rem;
            background: var(--bg-white);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            transition: var(--transition);
        }

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

        .step-item::before {
            counter-increment: step;
            content: "0" counter(step);
            position: absolute;
            top: -0.75rem;
            right: 1.25rem;
            font-size: 3rem;
            font-weight: 800;
            color: rgba(26, 86, 219, 0.08);
            line-height: 1;
            letter-spacing: -0.04em;
        }

        .step-icon {
            width: 60px;
            height: 60px;
            background: rgba(26, 86, 219, 0.08);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 1rem;
            font-size: 1.5rem;
            color: var(--primary);
            transition: var(--transition);
        }

        .step-item:hover .step-icon {
            background: var(--primary);
            color: #fff;
        }

        .step-item h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 0.4rem;
        }

        .step-item p {
            font-size: 0.875rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== Feature List ===== */
        .feature-list {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .feature-item {
            display: flex;
            align-items: flex-start;
            gap: 1rem;
            padding: 1.25rem 1.5rem;
            background: var(--bg-white);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            transition: var(--transition);
        }

        .feature-item:hover {
            box-shadow: var(--shadow-hover);
            transform: translateX(4px);
        }

        .feature-icon {
            width: 44px;
            height: 44px;
            background: rgba(26, 86, 219, 0.08);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--primary);
            flex-shrink: 0;
        }

        .feature-text h4 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 0.25rem;
        }

        .feature-text p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== FAQ ===== */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }

        .faq-item {
            background: var(--bg-white);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }

        .faq-item:hover {
            box-shadow: var(--shadow-hover);
        }

        .faq-question {
            padding: 1.25rem 1.5rem;
            font-weight: 600;
            font-size: 1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            background: none;
            width: 100%;
            text-align: left;
            color: var(--text-primary);
            transition: var(--transition);
        }

        .faq-question:hover {
            color: var(--primary);
        }

        .faq-question i {
            color: var(--text-muted);
            transition: var(--transition);
            font-size: 0.85rem;
        }

        .faq-item.active .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }

        .faq-answer {
            padding: 0 1.5rem 1.25rem;
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.8;
            display: none;
        }

        .faq-item.active .faq-answer {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-block {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
            border-radius: var(--radius-lg);
            padding: 4rem 3rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-block::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.12;
            mix-blend-mode: overlay;
        }

        .cta-block h2 {
            font-size: 2.2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 0.75rem;
            position: relative;
            z-index: 1;
        }

        .cta-block p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 600px;
            margin: 0 auto 2rem;
            position: relative;
            z-index: 1;
        }

        .cta-btn {
            display: inline-block;
            background: var(--accent);
            color: #0f172a !important;
            font-weight: 700;
            padding: 0.85rem 2.5rem;
            border-radius: var(--radius-sm);
            font-size: 1.1rem;
            box-shadow: 0 8px 30px rgba(245, 158, 11, 0.30);
            transition: var(--transition);
            position: relative;
            z-index: 1;
        }

        .cta-btn:hover {
            background: var(--accent-dark);
            box-shadow: 0 12px 40px rgba(245, 158, 11, 0.40);
            transform: translateY(-2px);
            color: #0f172a !important;
        }

        /* ===== Footer ===== */
        .footer {
            background: #0f172a;
            color: rgba(255, 255, 255, 0.85);
            padding: 4rem 0 0;
            margin-top: 4rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 2.5rem;
            margin-bottom: 2.5rem;
        }

        .footer-brand .logo {
            color: #fff;
            margin-bottom: 1rem;
        }

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

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

        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.65);
            line-height: 1.8;
            margin-bottom: 1.25rem;
            max-width: 360px;
        }

        .footer-social {
            display: flex;
            gap: 0.75rem;
        }

        .footer-social a {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.7);
            font-size: 1.1rem;
            transition: var(--transition);
        }

        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }

        .footer-col h4 {
            color: #fff;
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 1.25rem;
        }

        .footer-col a {
            display: block;
            color: rgba(255, 255, 255, 0.65);
            font-size: 0.9rem;
            padding: 0.3rem 0;
            transition: var(--transition);
        }

        .footer-col a:hover {
            color: var(--accent);
            padding-left: 4px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 1.5rem 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 0.75rem;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
        }

        .footer-bottom a {
            color: rgba(255, 255, 255, 0.7);
        }

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

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
            .step-flow {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .page-hero h1 {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }

            .nav {
                display: none;
                flex-direction: column;
                width: 100%;
                padding: 1rem 0;
                gap: 0.25rem;
                border-top: 1px solid var(--border);
                background: var(--bg-white);
            }

            .nav.open {
                display: flex;
            }

            .nav a {
                width: 100%;
                padding: 0.75rem 1rem;
            }

            .nav a.active::after {
                display: none;
            }

            .header-inner {
                flex-wrap: wrap;
            }

            .grid-3,
            .grid-2 {
                grid-template-columns: 1fr;
            }

            .step-flow {
                grid-template-columns: 1fr;
            }

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

            .page-hero {
                min-height: 240px;
            }

            .page-hero h1 {
                font-size: 1.8rem;
            }

            .page-hero p {
                font-size: 1rem;
            }

            .section-title {
                font-size: 1.6rem;
            }

            .cta-block {
                padding: 2.5rem 1.5rem;
            }

            .cta-block h2 {
                font-size: 1.6rem;
            }

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

            .breadcrumb {
                font-size: 0.8rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 1rem;
            }

            .page-hero h1 {
                font-size: 1.5rem;
            }

            .section {
                padding: 3rem 0;
            }

            .card-body {
                padding: 1.25rem;
            }

            .feature-item {
                flex-direction: column;
                padding: 1rem 1.25rem;
            }

            .faq-question {
                padding: 1rem 1.25rem;
                font-size: 0.95rem;
            }

            .faq-answer {
                padding: 0 1.25rem 1rem;
            }

            .step-item {
                padding: 1.5rem 1rem;
            }

            .cta-btn {
                padding: 0.7rem 2rem;
                font-size: 1rem;
            }
        }

        /* ===== Smooth Scroll & Misc ===== */
        .scroll-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            width: 44px;
            height: 44px;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            box-shadow: 0 4px 20px rgba(26, 86, 219, 0.30);
            transition: var(--transition);
            opacity: 0;
            visibility: hidden;
            z-index: 999;
            cursor: pointer;
        }

        .scroll-top.visible {
            opacity: 1;
            visibility: visible;
        }

        .scroll-top:hover {
            background: var(--primary-dark);
            transform: translateY(-3px);
            box-shadow: 0 8px 30px rgba(26, 86, 219, 0.40);
        }

        .badge {
            display: inline-block;
            background: rgba(26, 86, 219, 0.08);
            color: var(--primary);
            padding: 0.25rem 0.85rem;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 600;
        }

        .badge-accent {
            background: rgba(245, 158, 11, 0.12);
            color: var(--accent-dark);
        }

        .divider {
            height: 1px;
            background: var(--border);
            margin: 1.5rem 0;
        }

        .mt-1 {
            margin-top: 1rem;
        }
        .mt-2 {
            margin-top: 2rem;
        }
        .mt-3 {
            margin-top: 3rem;
        }
        .mb-1 {
            margin-bottom: 1rem;
        }
        .mb-2 {
            margin-bottom: 2rem;
        }
        .gap-1 {
            gap: 1rem;
        }
        .gap-2 {
            gap: 2rem;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }

/* roulang page: article */
/* ===== Design Variables ===== */
:root {
  --primary: #1a56db;
  --primary-dark: #1243af;
  --primary-light: #3b82f6;
  --accent: #f59e0b;
  --accent-dark: #d97706;
  --accent-light: #fbbf24;
  --bg: #f8fafc;
  --bg-alt: #f1f5f9;
  --bg-dark: #0f172a;
  --text: #1e293b;
  --text-secondary: #64748b;
  --text-light: #94a3b8;
  --text-white: #ffffff;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
  --max-width: 1200px;
}

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

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

/* ===== Header / Nav ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition), box-shadow var(--transition);
}
.site-header.scrolled {
  background: rgba(255,255,255,0.98);
  box-shadow: 0 2px 20px rgba(0,0,0,0.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 24px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 22px;
  font-weight: 800;
  color: var(--text);
  white-space: nowrap;
}
.logo i { color: var(--primary); font-size: 24px; }
.logo span { color: var(--accent); }
.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav a {
  display: block;
  padding: 8px 18px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-xs);
  transition: all var(--transition);
  position: relative;
}
.nav a:hover {
  color: var(--primary);
  background: rgba(26,86,219,0.06);
}
.nav a.active {
  color: var(--primary);
  background: rgba(26,86,219,0.10);
  font-weight: 600;
}
.nav a.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: var(--primary);
  border-radius: 4px;
}
.nav-toggle {
  display: none;
  font-size: 24px;
  color: var(--text);
  padding: 8px;
  border-radius: var(--radius-xs);
  transition: background var(--transition);
}
.nav-toggle:hover { background: var(--bg-alt); }
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav {
    position: fixed;
    top: 68px;
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 12px 16px 20px;
    gap: 2px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  }
  .nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav a {
    padding: 12px 16px;
    font-size: 16px;
    width: 100%;
    border-radius: var(--radius-xs);
  }
  .nav a.active::after { display: none; }
  .nav a.active { background: rgba(26,86,219,0.10); }
}

/* ===== Article Hero ===== */
.article-hero {
  position: relative;
  padding: 120px 0 80px;
  margin-top: 0;
  background: var(--bg-dark);
  overflow: hidden;
  min-height: 420px;
  display: flex;
  align-items: center;
}
.article-hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  opacity: 0.35;
  z-index: 0;
}
.article-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15,23,42,0.85) 0%, rgba(15,23,42,0.50) 60%, rgba(26,86,219,0.30) 100%);
  z-index: 1;
}
.article-hero .container {
  position: relative;
  z-index: 2;
  width: 100%;
}
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  margin-bottom: 20px;
}
.breadcrumb a {
  color: rgba(255,255,255,0.7);
  transition: color var(--transition);
}
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { color: rgba(255,255,255,0.4); }
.breadcrumb .current { color: var(--accent-light); font-weight: 500; }
.article-hero-category {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent);
  color: var(--text);
  font-size: 13px;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 20px;
  margin-bottom: 16px;
  letter-spacing: 0.3px;
}
.article-hero h1 {
  font-size: 40px;
  font-weight: 800;
  color: var(--text-white);
  line-height: 1.25;
  max-width: 900px;
  margin-bottom: 20px;
  text-shadow: 0 2px 12px rgba(0,0,0,0.20);
}
.article-hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
  font-size: 15px;
  color: rgba(255,255,255,0.75);
}
.article-hero-meta i { margin-right: 6px; }
.article-hero-meta span { display: inline-flex; align-items: center; }
@media (max-width: 768px) {
  .article-hero { padding: 100px 0 60px; min-height: 320px; }
  .article-hero h1 { font-size: 28px; }
  .article-hero-meta { gap: 12px; font-size: 14px; flex-wrap: wrap; }
}
@media (max-width: 520px) {
  .article-hero h1 { font-size: 24px; }
  .article-hero { padding: 90px 0 50px; min-height: 260px; }
}

/* ===== Article Content ===== */
.article-section { padding: 48px 0; }
.article-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  max-width: 860px;
  margin: 0 auto;
}
.article-body {
  background: var(--text-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 48px;
  border: 1px solid var(--border);
}
.article-body .content-not-found {
  text-align: center;
  padding: 60px 20px;
}
.article-body .content-not-found i { font-size: 56px; color: var(--text-light); margin-bottom: 20px; }
.article-body .content-not-found h2 { font-size: 24px; color: var(--text); margin-bottom: 12px; }
.article-body .content-not-found p { color: var(--text-secondary); margin-bottom: 24px; }
.article-body .content-not-found .btn { display: inline-flex; }
.article-content {
  font-size: 17px;
  line-height: 1.9;
  color: var(--text);
}
.article-content p { margin-bottom: 1.2em; }
.article-content h2 { font-size: 26px; margin-top: 1.6em; margin-bottom: 0.6em; }
.article-content h3 { font-size: 22px; margin-top: 1.4em; margin-bottom: 0.5em; }
.article-content ul, .article-content ol { margin-bottom: 1.2em; padding-left: 1.6em; }
.article-content ul li { list-style: disc; margin-bottom: 0.3em; }
.article-content ol li { list-style: decimal; margin-bottom: 0.3em; }
.article-content blockquote {
  border-left: 4px solid var(--primary);
  background: var(--bg-alt);
  padding: 16px 24px;
  margin: 1.2em 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
  font-style: italic;
}
.article-content img { border-radius: var(--radius-sm); margin: 1.5em 0; box-shadow: var(--shadow-sm); }
.article-content a { color: var(--primary); font-weight: 500; text-decoration: underline; }
.article-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 36px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.article-tags .label { font-size: 14px; color: var(--text-secondary); font-weight: 500; }
.article-tags .tag {
  display: inline-block;
  background: var(--bg-alt);
  color: var(--text-secondary);
  font-size: 13px;
  padding: 4px 14px;
  border-radius: 20px;
  transition: all var(--transition);
  border: 1px solid var(--border);
}
.article-tags .tag:hover { background: var(--primary); color: var(--text-white); border-color: var(--primary); }
.article-share {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.article-share .label { font-size: 14px; color: var(--text-secondary); }
.article-share a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-alt);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  transition: all var(--transition);
  font-size: 16px;
}
.article-share a:hover { background: var(--primary); color: var(--text-white); border-color: var(--primary); transform: translateY(-2px); }
@media (max-width: 768px) {
  .article-body { padding: 28px 20px; }
  .article-content { font-size: 16px; }
  .article-content h2 { font-size: 22px; }
  .article-content h3 { font-size: 19px; }
}
@media (max-width: 520px) {
  .article-body { padding: 20px 16px; border-radius: var(--radius-sm); }
  .article-content { font-size: 15px; }
}

/* ===== Article Navigation ===== */
.article-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 32px;
}
.article-nav a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 24px;
  background: var(--text-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  color: var(--text);
  font-weight: 500;
}
.article-nav a:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}
.article-nav a i { font-size: 18px; color: var(--primary); }
.article-nav .nav-next { text-align: right; justify-content: flex-end; }
@media (max-width: 640px) {
  .article-nav { grid-template-columns: 1fr; }
  .article-nav .nav-next { text-align: left; justify-content: flex-start; }
}

/* ===== Related Section ===== */
.related-section {
  padding: 60px 0;
  background: var(--bg-alt);
}
.related-section .section-header {
  text-align: center;
  margin-bottom: 40px;
}
.related-section .section-header h2 {
  font-size: 30px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}
.related-section .section-header p {
  color: var(--text-secondary);
  font-size: 16px;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.related-card {
  background: var(--text-white);
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}
.related-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.related-card-img {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--bg-alt);
}
.related-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.related-card:hover .related-card-img img { transform: scale(1.06); }
.related-card-body {
  padding: 18px 20px 20px;
}
.related-card-body .card-cat {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--primary);
  background: rgba(26,86,219,0.08);
  padding: 2px 12px;
  border-radius: 12px;
  margin-bottom: 10px;
}
.related-card-body h3 {
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.related-card-body h3 a { color: var(--text); }
.related-card-body h3 a:hover { color: var(--primary); }
.related-card-body .card-meta {
  font-size: 13px;
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: 12px;
}
.related-card-body .card-meta i { margin-right: 4px; }
.related-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 40px 20px;
  color: var(--text-secondary);
  background: var(--text-white);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
@media (max-width: 1024px) {
  .related-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .related-grid { grid-template-columns: 1fr; }
  .related-section .section-header h2 { font-size: 24px; }
}

/* ===== FAQ Section ===== */
.faq-section {
  padding: 60px 0;
  background: var(--text-white);
}
.faq-section .section-header {
  text-align: center;
  margin-bottom: 40px;
}
.faq-section .section-header h2 {
  font-size: 30px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}
.faq-section .section-header p {
  color: var(--text-secondary);
  font-size: 16px;
}
.faq-list {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color var(--transition);
}
.faq-item:hover { border-color: var(--primary-light); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  background: var(--bg);
  cursor: pointer;
  transition: background var(--transition);
  border: none;
  width: 100%;
  text-align: left;
}
.faq-question:hover { background: var(--bg-alt); }
.faq-question i {
  font-size: 14px;
  color: var(--text-light);
  transition: transform var(--transition);
}
.faq-item.open .faq-question i { transform: rotate(180deg); color: var(--primary); }
.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  color: var(--text-secondary);
  font-size: 15px;
  line-height: 1.8;
  background: var(--text-white);
}
.faq-item.open .faq-answer {
  padding: 20px 24px;
  max-height: 400px;
}
@media (max-width: 768px) {
  .faq-section .section-header h2 { font-size: 24px; }
  .faq-question { padding: 14px 16px; font-size: 15px; }
  .faq-answer { padding: 0 16px; font-size: 14px; }
  .faq-item.open .faq-answer { padding: 16px; }
}

/* ===== CTA Section ===== */
.cta-section {
  padding: 70px 0;
  background: var(--bg-dark);
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26,86,219,0.20) 0%, rgba(245,158,11,0.10) 100%);
  z-index: 0;
}
.cta-section .container { position: relative; z-index: 1; text-align: center; }
.cta-section h2 {
  font-size: 34px;
  font-weight: 800;
  color: var(--text-white);
  margin-bottom: 12px;
}
.cta-section p {
  font-size: 18px;
  color: rgba(255,255,255,0.7);
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.6;
}
.cta-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 600;
  border-radius: 50px;
  transition: all var(--transition);
  border: 2px solid transparent;
  text-decoration: none;
  cursor: pointer;
}
.btn-primary {
  background: var(--accent);
  color: var(--text);
  border-color: var(--accent);
}
.btn-primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  color: var(--text);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(245,158,11,0.30);
}
.btn-outline-light {
  background: transparent;
  color: var(--text-white);
  border-color: rgba(255,255,255,0.30);
}
.btn-outline-light:hover {
  background: rgba(255,255,255,0.10);
  border-color: var(--text-white);
  color: var(--text-white);
  transform: translateY(-2px);
}
.btn-lg { padding: 16px 40px; font-size: 18px; }
@media (max-width: 768px) {
  .cta-section h2 { font-size: 26px; }
  .cta-section p { font-size: 16px; }
  .btn-lg { padding: 14px 28px; font-size: 16px; }
}
@media (max-width: 520px) {
  .cta-section { padding: 50px 0; }
  .cta-section h2 { font-size: 22px; }
  .cta-buttons { flex-direction: column; width: 100%; }
  .cta-buttons .btn { width: 100%; justify-content: center; }
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 60px 0 0;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .logo {
  color: var(--text-white);
  font-size: 24px;
  margin-bottom: 16px;
}
.footer-brand .logo span { color: var(--accent); }
.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255,255,255,0.5);
  margin-bottom: 20px;
  max-width: 360px;
}
.footer-social {
  display: flex;
  gap: 12px;
}
.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  color: rgba(255,255,255,0.5);
  border: 1px solid rgba(255,255,255,0.08);
  transition: all var(--transition);
  font-size: 18px;
}
.footer-social a:hover {
  background: var(--primary);
  color: var(--text-white);
  border-color: var(--primary);
  transform: translateY(-3px);
}
.footer-col h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-white);
  margin-bottom: 18px;
  letter-spacing: 0.5px;
}
.footer-col a {
  display: block;
  font-size: 14px;
  color: rgba(255,255,255,0.5);
  padding: 5px 0;
  transition: all var(--transition);
}
.footer-col a:hover { color: var(--accent); padding-left: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: rgba(255,255,255,0.35);
}
.footer-bottom a { color: rgba(255,255,255,0.35); }
.footer-bottom a:hover { color: var(--accent); }
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .footer-col:last-child { grid-column: 1 / -1; }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-col { grid-column: 1 / -1; }
}

/* ===== Scroll to Top ===== */
.scroll-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--text-white);
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  z-index: 999;
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
  transition: all var(--transition);
  border: none;
  cursor: pointer;
}
.scroll-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.scroll-top:hover {
  background: var(--primary-dark);
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(26,86,219,0.35);
}
@media (max-width: 520px) {
  .scroll-top { bottom: 20px; right: 20px; width: 42px; height: 42px; font-size: 18px; }
}

/* ===== Additional Utilities ===== */
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }