/* roulang page: index */
/* ===== 设计变量 ===== */
:root {
  --clr-primary: #0b0e1a;
  --clr-primary-light: #111827;
  --clr-secondary: #1e3a5f;
  --clr-accent: #f0b429;
  --clr-accent-hover: #d4a020;
  --clr-accent-glow: rgba(240, 180, 41, 0.25);
  --clr-bg: #0a0d16;
  --clr-surface: rgba(255, 255, 255, 0.04);
  --clr-surface-hover: rgba(255, 255, 255, 0.08);
  --clr-surface-active: rgba(240, 180, 41, 0.12);
  --clr-text: #f1f5f9;
  --clr-text-secondary: #94a3b8;
  --clr-text-muted: #64748b;
  --clr-border: rgba(255, 255, 255, 0.08);
  --clr-border-light: rgba(255, 255, 255, 0.12);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 8px 32px rgba(0,0,0,0.35);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 40px var(--clr-accent-glow);
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --nav-height: 72px;
}

/* ===== 基础重置 ===== */
*, *::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(--clr-bg);
  color: var(--clr-text);
  line-height: 1.7;
  font-size: 16px;
  min-height: 100vh;
}
a { color: var(--clr-accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--clr-accent-hover); }
img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-md); }
button, input, select, textarea { font-family: inherit; font-size: inherit; outline: none; border: none; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 600; color: var(--clr-text); }
h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.6rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.6rem); }
p { margin-bottom: 1rem; color: var(--clr-text-secondary); }
::selection { background: var(--clr-accent); color: var(--clr-primary); }

/* ===== 容器 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}
@media (max-width: 768px) {
  .container { padding: 0 var(--spacing-sm); }
}

/* ===== 导航 ===== */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(10, 13, 22, 0.82);
  backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid var(--clr-border);
  transition: var(--transition);
}
header.scrolled {
  background: rgba(10, 13, 22, 0.95);
  box-shadow: var(--shadow-md);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--clr-text);
  letter-spacing: -0.02em;
  white-space: nowrap;
}
.logo i {
  color: var(--clr-accent);
  font-size: 1.5rem;
  filter: drop-shadow(0 0 12px var(--clr-accent-glow));
}
.logo span { background: linear-gradient(135deg, var(--clr-text) 60%, var(--clr-accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.nav-tabs {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(255,255,255,0.04);
  padding: 0.3rem;
  border-radius: var(--radius-xl);
  border: 1px solid var(--clr-border);
}
.nav-tab {
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-lg);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--clr-text-secondary);
  transition: var(--transition);
  cursor: pointer;
  white-space: nowrap;
  background: transparent;
  border: none;
  position: relative;
}
.nav-tab:hover { color: var(--clr-text); background: var(--clr-surface); }
.nav-tab.active {
  color: var(--clr-primary);
  background: var(--clr-accent);
  box-shadow: 0 4px 20px var(--clr-accent-glow);
}
.nav-tab.active:hover { color: var(--clr-primary); background: var(--clr-accent-hover); }
.header-cta {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.header-cta .btn-primary {
  padding: 0.5rem 1.5rem;
  border-radius: var(--radius-lg);
  font-size: 0.9rem;
  font-weight: 600;
  background: var(--clr-accent);
  color: var(--clr-primary);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}
.header-cta .btn-primary:hover {
  background: var(--clr-accent-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--clr-text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.4rem;
}
@media (max-width: 900px) {
  .nav-tabs { display: none; }
  .header-cta .btn-primary { display: none; }
  .mobile-toggle { display: flex; }
  .mobile-menu-open .nav-tabs {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(10, 13, 22, 0.98);
    backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--clr-border);
    padding: 1rem;
    border-radius: 0;
    gap: 0.3rem;
    align-items: stretch;
  }
  .mobile-menu-open .nav-tab {
    padding: 0.75rem 1.25rem;
    text-align: center;
  }
  .mobile-menu-open .header-cta .btn-primary {
    display: block;
    margin: 0.5rem 1rem 1rem;
    text-align: center;
  }
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--nav-height) var(--spacing-md) var(--spacing-lg);
  background: linear-gradient(160deg, #080b14 0%, #0f1a2e 40%, #141f33 70%, #0a0d16 100%);
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
  opacity: 0.35;
  mask-image: radial-gradient(ellipse at center, rgba(0,0,0,0.6) 0%, rgba(0,0,0,0) 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, rgba(0,0,0,0.6) 0%, rgba(0,0,0,0) 80%);
  pointer-events: none;
}
.hero-glow {
  position: absolute;
  width: 700px;
  height: 700px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(240,180,41,0.08) 0%, rgba(240,180,41,0) 70%);
  top: 20%;
  left: 50%;
  transform: translate(-50%, -20%);
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 860px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1.2rem;
  border-radius: var(--radius-xl);
  background: rgba(240,180,41,0.12);
  border: 1px solid rgba(240,180,41,0.25);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--clr-accent);
  margin-bottom: 1.5rem;
}
.hero-badge i { font-size: 0.75rem; }
.hero h1 {
  margin-bottom: 1.2rem;
  background: linear-gradient(135deg, #f1f5f9 40%, var(--clr-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p {
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  color: var(--clr-text-secondary);
  max-width: 640px;
  margin: 0 auto 2.2rem;
  line-height: 1.8;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}
.btn-hero {
  padding: 0.8rem 2.5rem;
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}
.btn-hero-primary {
  background: var(--clr-accent);
  color: var(--clr-primary);
}
.btn-hero-primary:hover {
  background: var(--clr-accent-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
  color: var(--clr-primary);
}
.btn-hero-secondary {
  background: rgba(255,255,255,0.06);
  color: var(--clr-text);
  border: 1px solid var(--clr-border-light);
}
.btn-hero-secondary:hover {
  background: rgba(255,255,255,0.12);
  color: var(--clr-text);
  transform: translateY(-2px);
}
.hero-stats {
  display: flex;
  gap: 3rem;
  justify-content: center;
  margin-top: 3rem;
  flex-wrap: wrap;
}
.hero-stat-item {
  text-align: center;
}
.hero-stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--clr-text);
  letter-spacing: -0.02em;
}
.hero-stat-number i {
  color: var(--clr-accent);
  font-size: 1.2rem;
  margin-right: 0.3rem;
}
.hero-stat-label {
  font-size: 0.85rem;
  color: var(--clr-text-muted);
  margin-top: 0.15rem;
}

/* ===== 板块通用 ===== */
.section {
  padding: var(--spacing-xl) 0;
  position: relative;
}
.section-alt {
  background: var(--clr-primary-light);
}
.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--spacing-lg);
}
.section-header h2 {
  margin-bottom: 0.8rem;
}
.section-header p {
  font-size: 1.05rem;
  color: var(--clr-text-secondary);
}
.section-divider {
  width: 60px;
  height: 3px;
  background: var(--clr-accent);
  border-radius: 4px;
  margin: 0.8rem auto 1.2rem;
  box-shadow: 0 0 20px var(--clr-accent-glow);
}

/* ===== 关于/介绍 ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}
.about-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  position: relative;
}
.about-image::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  box-shadow: inset 0 0 60px rgba(10,13,22,0.3);
}
.about-image img {
  width: 100%;
  height: 400px;
  object-fit: cover;
  display: block;
}
.about-text h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}
.about-text p {
  margin-bottom: 1.2rem;
  line-height: 1.8;
}
.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
  margin-top: 1.5rem;
}
.about-feature-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.95rem;
  color: var(--clr-text-secondary);
}
.about-feature-item i {
  color: var(--clr-accent);
  font-size: 0.85rem;
  width: 1.2rem;
  text-align: center;
}
@media (max-width: 768px) {
  .about-grid { grid-template-columns: 1fr; gap: 2rem; }
  .about-features { grid-template-columns: 1fr; }
  .about-image img { height: 260px; }
}

/* ===== 卡片网格 ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}
.card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 1.8rem 1.6rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.card:hover {
  background: var(--clr-surface-hover);
  border-color: var(--clr-border-light);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: rgba(240,180,41,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--clr-accent);
  margin-bottom: 1rem;
}
.card h3 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}
.card p {
  font-size: 0.92rem;
  color: var(--clr-text-secondary);
  margin-bottom: 0;
  line-height: 1.7;
}
.card-tag {
  display: inline-block;
  padding: 0.2rem 0.8rem;
  border-radius: var(--radius-sm);
  background: rgba(240,180,41,0.1);
  color: var(--clr-accent);
  font-size: 0.75rem;
  font-weight: 500;
  margin-top: 0.8rem;
}

/* ===== 分类入口 ===== */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}
.category-card {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--clr-border);
  transition: var(--transition);
  background: var(--clr-surface);
  height: 100%;
}
.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--clr-border-light);
}
.category-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: 0;
}
.category-card-body {
  padding: 1.2rem 1.4rem 1.4rem;
}
.category-card-body h3 {
  font-size: 1.1rem;
  margin-bottom: 0.3rem;
}
.category-card-body p {
  font-size: 0.88rem;
  color: var(--clr-text-muted);
  margin-bottom: 0;
}
.category-card .card-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(10,13,22,0.75);
  backdrop-filter: blur(8px);
  color: var(--clr-text);
  border: none;
}

/* ===== 最新资讯列表 ===== */
.post-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.post-item {
  display: flex;
  gap: 1.2rem;
  padding: 1.2rem 1.4rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  transition: var(--transition);
  align-items: flex-start;
}
.post-item:hover {
  background: var(--clr-surface-hover);
  border-color: var(--clr-border-light);
  transform: translateX(4px);
}
.post-meta {
  display: flex;
  gap: 0.8rem;
  align-items: center;
  flex-shrink: 0;
  min-width: 120px;
}
.post-meta .post-category {
  padding: 0.2rem 0.8rem;
  border-radius: var(--radius-sm);
  background: rgba(240,180,41,0.1);
  color: var(--clr-accent);
  font-size: 0.75rem;
  font-weight: 500;
}
.post-meta .post-date {
  font-size: 0.8rem;
  color: var(--clr-text-muted);
  white-space: nowrap;
}
.post-content {
  flex: 1;
}
.post-content h3 {
  font-size: 1.05rem;
  margin-bottom: 0.25rem;
  font-weight: 600;
}
.post-content h3 a {
  color: var(--clr-text);
  transition: var(--transition);
}
.post-content h3 a:hover { color: var(--clr-accent); }
.post-content p {
  font-size: 0.88rem;
  color: var(--clr-text-secondary);
  margin-bottom: 0;
  line-height: 1.6;
}
.post-empty {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--clr-text-muted);
  font-size: 1rem;
  background: var(--clr-surface);
  border-radius: var(--radius-md);
  border: 1px dashed var(--clr-border);
}
@media (max-width: 640px) {
  .post-item { flex-direction: column; gap: 0.6rem; }
  .post-meta { min-width: unset; }
}

/* ===== 流程步骤 ===== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 2rem;
  counter-reset: step;
}
.step-card {
  text-align: center;
  padding: 2rem 1.2rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  transition: var(--transition);
  position: relative;
}
.step-card:hover {
  background: var(--clr-surface-hover);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.step-number {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--clr-accent);
  color: var(--clr-primary);
  font-size: 1.4rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.2rem;
  box-shadow: 0 0 30px var(--clr-accent-glow);
}
.step-card h3 {
  font-size: 1.05rem;
  margin-bottom: 0.4rem;
}
.step-card p {
  font-size: 0.88rem;
  color: var(--clr-text-secondary);
  margin-bottom: 0;
  line-height: 1.6;
}

/* ===== 数据统计 ===== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}
.stat-block {
  text-align: center;
  padding: 2rem 1rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}
.stat-block:hover {
  background: var(--clr-surface-hover);
  transform: translateY(-2px);
}
.stat-number {
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--clr-text);
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.stat-number i {
  color: var(--clr-accent);
  font-size: 1.2rem;
  margin-right: 0.2rem;
}
.stat-label {
  font-size: 0.85rem;
  color: var(--clr-text-muted);
  margin-top: 0.3rem;
}
@media (max-width: 768px) {
  .stats-row { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px) {
  .stats-row { grid-template-columns: 1fr 1fr; gap: 0.8rem; }
  .stat-number { font-size: 1.8rem; }
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 780px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.faq-item {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}
.faq-item:hover {
  border-color: var(--clr-border-light);
}
.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.1rem 1.4rem;
  background: none;
  border: none;
  color: var(--clr-text);
  font-size: 1rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
  gap: 1rem;
}
.faq-question:hover { color: var(--clr-accent); }
.faq-question i {
  font-size: 0.8rem;
  color: var(--clr-text-muted);
  transition: var(--transition);
  flex-shrink: 0;
}
.faq-item.open .faq-question i {
  transform: rotate(180deg);
  color: var(--clr-accent);
}
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
  padding: 0 1.4rem;
}
.faq-item.open .faq-answer {
  max-height: 300px;
  padding: 0 1.4rem 1.2rem;
}
.faq-answer p {
  font-size: 0.92rem;
  color: var(--clr-text-secondary);
  margin-bottom: 0;
  line-height: 1.7;
}

/* ===== CTA ===== */
.cta-section {
  background: linear-gradient(135deg, #0f1a2e 0%, #1a2a45 50%, #0f1a2e 100%);
  border-top: 1px solid var(--clr-border);
  border-bottom: 1px solid var(--clr-border);
}
.cta-box {
  text-align: center;
  padding: var(--spacing-lg) 0;
}
.cta-box h2 {
  margin-bottom: 0.8rem;
}
.cta-box p {
  font-size: 1.05rem;
  color: var(--clr-text-secondary);
  max-width: 560px;
  margin: 0 auto 2rem;
}
.cta-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}
.btn-cta {
  padding: 0.9rem 2.8rem;
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition);
  cursor: pointer;
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}
.btn-cta-primary {
  background: var(--clr-accent);
  color: var(--clr-primary);
}
.btn-cta-primary:hover {
  background: var(--clr-accent-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
  color: var(--clr-primary);
}
.btn-cta-secondary {
  background: rgba(255,255,255,0.06);
  color: var(--clr-text);
  border: 1px solid var(--clr-border-light);
}
.btn-cta-secondary:hover {
  background: rgba(255,255,255,0.12);
  color: var(--clr-text);
  transform: translateY(-2px);
}

/* ===== 页脚 ===== */
footer {
  background: var(--clr-primary);
  border-top: 1px solid var(--clr-border);
  padding: var(--spacing-lg) 0 var(--spacing-md);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: var(--spacing-lg);
}
.footer-brand .logo {
  font-size: 1.15rem;
  margin-bottom: 0.8rem;
}
.footer-brand p {
  font-size: 0.88rem;
  color: var(--clr-text-muted);
  max-width: 320px;
  line-height: 1.7;
}
.footer-col h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--clr-text);
  margin-bottom: 1rem;
}
.footer-col ul li {
  margin-bottom: 0.5rem;
}
.footer-col ul li a {
  font-size: 0.88rem;
  color: var(--clr-text-muted);
  transition: var(--transition);
}
.footer-col ul li a:hover {
  color: var(--clr-accent);
  padding-left: 3px;
}
.footer-bottom {
  border-top: 1px solid var(--clr-border);
  padding-top: var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-bottom p {
  font-size: 0.82rem;
  color: var(--clr-text-muted);
  margin-bottom: 0;
}
.footer-bottom-links {
  display: flex;
  gap: 1.5rem;
}
.footer-bottom-links a {
  font-size: 0.82rem;
  color: var(--clr-text-muted);
}
.footer-bottom-links a:hover { color: var(--clr-accent); }
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
}

/* ===== 按钮通用 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
  cursor: pointer;
  border: none;
}
.btn-accent {
  background: var(--clr-accent);
  color: var(--clr-primary);
}
.btn-accent:hover {
  background: var(--clr-accent-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
  color: var(--clr-primary);
}
.btn-outline {
  background: transparent;
  color: var(--clr-text);
  border: 1px solid var(--clr-border-light);
}
.btn-outline:hover {
  background: var(--clr-surface);
  color: var(--clr-text);
  border-color: var(--clr-accent);
}

/* ===== 工具类 ===== */
.text-center { text-align: center; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* ===== 响应式微调 ===== */
@media (max-width: 520px) {
  .hero { min-height: 80vh; padding-top: calc(var(--nav-height) + 1rem); }
  .hero-stats { gap: 1.5rem; }
  .hero-stat-number { font-size: 1.5rem; }
  .card-grid { grid-template-columns: 1fr; }
  .categories-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr 1fr; gap: 1rem; }
  .section { padding: var(--spacing-lg) 0; }
}
@media (max-width: 400px) {
  .steps-grid { grid-template-columns: 1fr; }
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--clr-primary); }
::-webkit-scrollbar-thumb { background: var(--clr-secondary); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--clr-text-muted); }

/* ===== 动画 ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-in {
  animation: fadeInUp 0.6s ease forwards;
}
.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }
.animate-delay-4 { animation-delay: 0.4s; }

/* roulang page: article */
:root {
            --primary: #1a1a2e;
            --primary-light: #16213e;
            --primary-dark: #0f0f23;
            --accent: #e94560;
            --accent-light: #ff6b81;
            --accent-dark: #c2334a;
            --gold: #f0c040;
            --gold-light: #f5d872;
            --bg: #f8f9fc;
            --bg-card: #ffffff;
            --bg-dark: #1a1a2e;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #f1f5f9;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
            --shadow: 0 4px 20px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
            --radius: 16px;
            --radius-sm: 10px;
            --radius-xs: 6px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            --container: 1200px;
            --header-h: 72px;
        }

        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            padding-top: var(--header-h);
        }
        a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--accent-dark); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        ul, ol { list-style: none; }
        button { cursor: pointer; font-family: inherit; border: none; background: none; }
        input, textarea { font-family: inherit; }

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

        /* Header */
        #header {
            position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
            background: rgba(26, 26, 46, 0.96);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255,255,255,0.06);
            height: var(--header-h);
        }
        .header-inner {
            max-width: var(--container); margin: 0 auto; padding: 0 24px;
            display: flex; align-items: center; justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex; align-items: center; gap: 10px;
            font-size: 1.35rem; font-weight: 700; color: #fff;
        }
        .logo i { color: var(--gold); font-size: 1.5rem; }
        .logo span { background: linear-gradient(135deg, #fff, var(--gold-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .logo:hover { opacity: 0.9; }

        .nav-tabs { display: flex; align-items: center; gap: 4px; background: rgba(255,255,255,0.06); padding: 4px; border-radius: 50px; }
        .nav-tab {
            padding: 8px 22px; border-radius: 50px;
            font-size: 0.9rem; font-weight: 500; color: rgba(255,255,255,0.7);
            transition: all var(--transition); white-space: nowrap;
        }
        .nav-tab:hover { color: #fff; background: rgba(255,255,255,0.1); }
        .nav-tab.active { color: #fff; background: var(--accent); box-shadow: 0 4px 15px rgba(233,69,96,0.4); }

        .header-cta { display: flex; align-items: center; gap: 14px; }
        .btn-primary {
            display: inline-flex; align-items: center; gap: 8px;
            padding: 10px 26px; border-radius: 50px;
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: #fff; font-weight: 600; font-size: 0.9rem;
            transition: all var(--transition); box-shadow: 0 4px 18px rgba(233,69,96,0.35);
        }
        .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(233,69,96,0.5); color: #fff; }
        .btn-primary:active { transform: translateY(0); }
        .btn-outline {
            display: inline-flex; align-items: center; gap: 8px;
            padding: 10px 26px; border-radius: 50px;
            border: 2px solid var(--accent); color: var(--accent);
            font-weight: 600; font-size: 0.9rem; background: transparent;
            transition: all var(--transition);
        }
        .btn-outline:hover { background: var(--accent); color: #fff; transform: translateY(-2px); }
        .btn-outline-light {
            border-color: rgba(255,255,255,0.3); color: #fff;
        }
        .btn-outline-light:hover { border-color: #fff; background: rgba(255,255,255,0.1); color: #fff; }

        .mobile-toggle { display: none; color: #fff; font-size: 1.4rem; padding: 6px; }

        /* Article Hero */
        .article-hero {
            background: var(--primary-dark);
            padding: 60px 0 40px;
            position: relative;
            overflow: hidden;
        }
        .article-hero::before {
            content: '';
            position: absolute; inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.2;
            z-index: 0;
        }
        .article-hero .container { position: relative; z-index: 1; }
        .article-hero .breadcrumb {
            display: flex; align-items: center; gap: 8px;
            font-size: 0.85rem; color: rgba(255,255,255,0.5); margin-bottom: 20px;
        }
        .article-hero .breadcrumb a { color: rgba(255,255,255,0.6); }
        .article-hero .breadcrumb a:hover { color: var(--gold); }
        .article-hero .breadcrumb .sep { color: rgba(255,255,255,0.3); }
        .article-hero .breadcrumb .current { color: var(--gold); }
        .article-hero h1 {
            font-size: 2.4rem; font-weight: 800; color: #fff;
            line-height: 1.3; max-width: 860px; margin-bottom: 16px;
        }
        .article-meta {
            display: flex; flex-wrap: wrap; align-items: center; gap: 20px;
            color: rgba(255,255,255,0.6); font-size: 0.9rem;
        }
        .article-meta .category-tag {
            display: inline-block; padding: 4px 16px; border-radius: 50px;
            background: var(--accent); color: #fff; font-size: 0.8rem; font-weight: 600;
        }
        .article-meta i { margin-right: 4px; }

        /* Article Main */
        .article-main { padding: 50px 0 70px; }
        .article-layout {
            display: grid; grid-template-columns: 1fr 320px; gap: 48px;
            align-items: start;
        }
        .article-body {
            background: var(--bg-card); border-radius: var(--radius);
            padding: 40px 44px; box-shadow: var(--shadow);
        }
        .article-body .content {
            font-size: 1.05rem; line-height: 1.9; color: var(--text);
        }
        .article-body .content p { margin-bottom: 1.4em; }
        .article-body .content h2, .article-body .content h3 {
            margin-top: 1.8em; margin-bottom: 0.6em; font-weight: 700; color: var(--primary);
        }
        .article-body .content h2 { font-size: 1.6rem; }
        .article-body .content h3 { font-size: 1.25rem; }
        .article-body .content img { margin: 1.5em 0; border-radius: var(--radius-sm); box-shadow: var(--shadow-sm); }
        .article-body .content blockquote {
            border-left: 4px solid var(--accent); background: var(--bg);
            padding: 16px 24px; margin: 1.5em 0; border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-light); font-style: italic;
        }
        .article-body .content ul, .article-body .content ol {
            margin: 1em 0; padding-left: 1.8em; list-style: disc;
        }
        .article-body .content ol { list-style: decimal; }
        .article-body .content li { margin-bottom: 0.4em; }
        .article-body .content a { color: var(--accent); text-decoration: underline; }
        .article-body .content a:hover { color: var(--accent-dark); }

        .article-body .not-found {
            text-align: center; padding: 60px 20px;
        }
        .article-body .not-found i { font-size: 3rem; color: var(--text-light); margin-bottom: 20px; }
        .article-body .not-found h2 { font-size: 1.5rem; color: var(--text); margin-bottom: 12px; }
        .article-body .not-found p { color: var(--text-light); margin-bottom: 24px; }
        .article-body .not-found .btn-primary { display: inline-flex; }

        /* Sidebar */
        .article-sidebar { display: flex; flex-direction: column; gap: 28px; }
        .sidebar-card {
            background: var(--bg-card); border-radius: var(--radius);
            padding: 28px; box-shadow: var(--shadow);
        }
        .sidebar-card h3 {
            font-size: 1.1rem; font-weight: 700; color: var(--primary);
            margin-bottom: 18px; padding-bottom: 12px;
            border-bottom: 2px solid var(--border);
            display: flex; align-items: center; gap: 10px;
        }
        .sidebar-card h3 i { color: var(--accent); }
        .sidebar-list li { padding: 10px 0; border-bottom: 1px solid var(--border-light); }
        .sidebar-list li:last-child { border-bottom: none; }
        .sidebar-list a {
            display: flex; align-items: center; gap: 10px;
            color: var(--text); font-size: 0.92rem; font-weight: 500;
        }
        .sidebar-list a:hover { color: var(--accent); }
        .sidebar-list a i { color: var(--accent); font-size: 0.8rem; }

        .sidebar-tags { display: flex; flex-wrap: wrap; gap: 8px; }
        .sidebar-tags a {
            display: inline-block; padding: 5px 16px; border-radius: 50px;
            background: var(--bg); font-size: 0.8rem; color: var(--text-light);
            border: 1px solid var(--border); transition: all var(--transition);
        }
        .sidebar-tags a:hover { background: var(--accent); color: #fff; border-color: var(--accent); }

        .sidebar-cta {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            border-radius: var(--radius); padding: 32px 28px; text-align: center;
            color: #fff;
        }
        .sidebar-cta h3 { color: #fff; border-bottom-color: rgba(255,255,255,0.15); }
        .sidebar-cta p { font-size: 0.92rem; color: rgba(255,255,255,0.7); margin-bottom: 20px; }
        .sidebar-cta .btn-primary {
            background: linear-gradient(135deg, var(--gold), #d4a020); color: var(--primary);
            box-shadow: 0 4px 20px rgba(240,192,64,0.4);
        }
        .sidebar-cta .btn-primary:hover { box-shadow: 0 8px 30px rgba(240,192,64,0.6); }

        /* Related Articles */
        .related-section { padding: 50px 0; background: var(--bg); }
        .related-section h2 {
            font-size: 1.6rem; font-weight: 800; color: var(--primary);
            text-align: center; margin-bottom: 36px;
        }
        .related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
        .related-card {
            background: var(--bg-card); border-radius: var(--radius-sm);
            padding: 24px; box-shadow: var(--shadow-sm);
            transition: all var(--transition); border: 1px solid var(--border);
        }
        .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
        .related-card .date { font-size: 0.8rem; color: var(--text-light); margin-bottom: 8px; }
        .related-card h4 { font-size: 1rem; font-weight: 700; color: var(--primary); margin-bottom: 8px; }
        .related-card h4 a { color: var(--primary); }
        .related-card h4 a:hover { color: var(--accent); }
        .related-card p { font-size: 0.88rem; color: var(--text-light); line-height: 1.6; }

        /* Footer */
        footer {
            background: var(--primary-dark); color: rgba(255,255,255,0.8);
            padding: 60px 0 0;
        }
        .footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
        .footer-brand .logo { margin-bottom: 16px; font-size: 1.2rem; }
        .footer-brand p { font-size: 0.9rem; line-height: 1.8; color: rgba(255,255,255,0.55); max-width: 340px; }
        .footer-col h4 { color: #fff; font-size: 0.95rem; font-weight: 700; margin-bottom: 18px; position: relative; padding-bottom: 10px; }
        .footer-col h4::after { content: ''; position: absolute; bottom: 0; left: 0; width: 30px; height: 2px; background: var(--accent); }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul a { color: rgba(255,255,255,0.55); font-size: 0.88rem; transition: all var(--transition); display: flex; align-items: center; gap: 8px; }
        .footer-col ul a:hover { color: var(--gold); padding-left: 4px; }
        .footer-col ul a i { width: 18px; }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            padding: 24px 0; display: flex; justify-content: space-between;
            align-items: center; flex-wrap: wrap; gap: 12px;
            font-size: 0.82rem; color: rgba(255,255,255,0.4);
        }
        .footer-bottom-links { display: flex; gap: 20px; }
        .footer-bottom-links a { color: rgba(255,255,255,0.4); }
        .footer-bottom-links a:hover { color: var(--gold); }

        /* Responsive */
        @media (max-width: 1024px) {
            .article-layout { grid-template-columns: 1fr; }
            .related-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 900px) {
            .nav-tabs { display: none; }
            .nav-tabs.open { display: flex; flex-direction: column; position: absolute; top: var(--header-h); left: 0; right: 0; background: var(--primary); padding: 16px; border-radius: 0 0 var(--radius) var(--radius); gap: 6px; }
            .nav-tabs.open .nav-tab { width: 100%; text-align: center; padding: 12px; }
            .mobile-toggle { display: block; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .article-hero h1 { font-size: 1.6rem; }
            .article-body { padding: 24px 20px; }
            .article-body .content { font-size: 0.98rem; }
            .related-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 30px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }
        @media (max-width: 520px) {
            .header-inner { padding: 0 16px; }
            .article-hero { padding: 40px 0 30px; }
            .article-hero h1 { font-size: 1.3rem; }
            .article-meta { gap: 12px; font-size: 0.8rem; }
            .sidebar-card { padding: 20px; }
            .container { padding: 0 16px; }
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f172a;
            --primary-light: #1e293b;
            --primary-dark: #0b1120;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --accent-dark: #d97706;
            --bg-body: #f1f5f9;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --bg-section-alt: #eef2f7;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-light: #f8fafc;
            --border-color: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.18);
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.6;
            color: var(--text-primary);
            background: var(--bg-body);
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
            cursor: pointer;
        }
        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(2.2rem, 5vw, 3.6rem);
        }
        h2 {
            font-size: clamp(1.6rem, 3.5vw, 2.4rem);
        }
        h3 {
            font-size: clamp(1.2rem, 2.5vw, 1.6rem);
        }
        h4 {
            font-size: 1.1rem;
        }
        p {
            color: var(--text-secondary);
            margin-bottom: 1rem;
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .section-padding {
            padding: 80px 0;
        }
        .section-padding-sm {
            padding: 56px 0;
        }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            margin-bottom: 12px;
        }
        .section-title p {
            font-size: 1.1rem;
            max-width: 640px;
            margin: 0 auto;
            color: var(--text-muted);
        }
        .text-center {
            text-align: center;
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            border: 0;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 1rem;
            transition: var(--transition);
            border: 2px solid transparent;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: #fff;
            box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(245, 158, 11, 0.45);
        }
        .btn-primary:focus-visible {
            outline: 3px solid var(--accent-light);
            outline-offset: 2px;
        }
        .btn-outline {
            background: transparent;
            color: var(--text-light);
            border-color: rgba(255, 255, 255, 0.4);
        }
        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-2px);
        }
        .btn-outline:focus-visible {
            outline: 3px solid var(--accent-light);
            outline-offset: 2px;
        }
        .btn-white {
            background: #fff;
            color: var(--primary);
            box-shadow: var(--shadow-md);
        }
        .btn-white:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }
        .btn-white:focus-visible {
            outline: 3px solid var(--accent-light);
            outline-offset: 2px;
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.875rem;
            border-radius: var(--radius-sm);
        }

        /* ===== Badge & Tag ===== */
        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 100px;
            font-size: 0.8rem;
            font-weight: 600;
            background: rgba(245, 158, 11, 0.12);
            color: var(--accent-dark);
        }
        .badge-primary {
            background: var(--accent);
            color: #fff;
        }
        .tag {
            display: inline-block;
            padding: 4px 12px;
            border-radius: var(--radius-sm);
            font-size: 0.78rem;
            background: var(--bg-body);
            color: var(--text-secondary);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .tag:hover {
            border-color: var(--accent);
            color: var(--accent-dark);
            background: rgba(245, 158, 11, 0.05);
        }

        /* ===== Header & Navigation ===== */
        #header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(15, 23, 42, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            height: var(--header-height);
            transition: var(--transition);
        }
        #header.scrolled {
            background: rgba(15, 23, 42, 0.98);
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
        }
        .header-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-light);
            font-size: 1.35rem;
            font-weight: 800;
            letter-spacing: -0.5px;
        }
        .logo i {
            color: var(--accent);
            font-size: 1.5rem;
        }
        .logo span {
            background: linear-gradient(135deg, #f8fafc, #e2e8f0);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .logo:hover span {
            background: linear-gradient(135deg, var(--accent-light), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-tabs {
            display: flex;
            align-items: center;
            gap: 4px;
            background: rgba(255, 255, 255, 0.06);
            padding: 4px;
            border-radius: var(--radius-md);
        }
        .nav-tab {
            padding: 8px 22px;
            border-radius: var(--radius-sm);
            color: rgba(255, 255, 255, 0.7);
            font-weight: 500;
            font-size: 0.95rem;
            transition: var(--transition);
            white-space: nowrap;
        }
        .nav-tab:hover {
            color: #fff;
            background: rgba(255, 255, 255, 0.08);
        }
        .nav-tab.active {
            color: var(--primary);
            background: #fff;
            box-shadow: var(--shadow-sm);
        }
        .nav-tab.active:hover {
            background: #fff;
            color: var(--primary);
        }
        .header-cta {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .header-cta .btn-primary {
            padding: 10px 22px;
            font-size: 0.9rem;
        }
        .mobile-toggle {
            display: none;
            color: var(--text-light);
            font-size: 1.4rem;
            padding: 6px 10px;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.08);
            transition: var(--transition);
        }
        .mobile-toggle:hover {
            background: rgba(255, 255, 255, 0.15);
        }

        /* ===== Hero / Banner ===== */
        .category-hero {
            position: relative;
            padding: 140px 0 80px;
            background: var(--primary-dark);
            overflow: hidden;
        }
        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.2;
            mix-blend-mode: overlay;
        }
        .category-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 30%, rgba(15, 23, 42, 0.6) 70%);
        }
        .category-hero .container {
            position: relative;
            z-index: 2;
        }
        .category-hero-content {
            max-width: 720px;
        }
        .category-hero-content .badge {
            margin-bottom: 16px;
            background: rgba(245, 158, 11, 0.2);
            color: var(--accent-light);
            border: 1px solid rgba(245, 158, 11, 0.2);
        }
        .category-hero-content h1 {
            color: var(--text-light);
            margin-bottom: 16px;
            font-weight: 800;
            letter-spacing: -1px;
        }
        .category-hero-content p {
            color: rgba(255, 255, 255, 0.7);
            font-size: 1.15rem;
            max-width: 560px;
            margin-bottom: 28px;
            line-height: 1.7;
        }
        .category-hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }

        /* ===== Section Alt Background ===== */
        .section-alt {
            background: var(--bg-section-alt);
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-light);
        }
        .section-dark .section-title h2 {
            color: var(--text-light);
        }
        .section-dark .section-title p {
            color: rgba(255, 255, 255, 0.6);
        }

        /* ===== Card Grid ===== */
        .card-grid {
            display: grid;
            gap: 28px;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        }
        .card-grid-3 {
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
        }
        .card-grid-4 {
            grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        }

        .card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(245, 158, 11, 0.2);
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
            background: var(--border-color);
        }
        .card-body {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .card-body .badge {
            align-self: flex-start;
            margin-bottom: 8px;
        }
        .card-body h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
        }
        .card-body p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 16px;
            flex: 1;
        }
        .card-footer {
            padding: 0 24px 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .card-footer .tag {
            font-size: 0.75rem;
        }
        .card-link {
            color: var(--accent-dark);
            font-weight: 600;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .card-link:hover {
            gap: 10px;
        }

        /* ===== Steps / Timeline ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 32px;
            counter-reset: step-counter;
        }
        .step-item {
            text-align: center;
            padding: 32px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            position: relative;
        }
        .step-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .step-item::before {
            counter-increment: step-counter;
            content: counter(step-counter);
            position: absolute;
            top: -14px;
            left: 50%;
            transform: translateX(-50%);
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
        }
        .step-item .step-icon {
            font-size: 2.2rem;
            color: var(--accent);
            margin-bottom: 16px;
            margin-top: 8px;
        }
        .step-item h4 {
            margin-bottom: 8px;
        }
        .step-item p {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }

        /* ===== Content List ===== */
        .content-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .content-item {
            display: flex;
            align-items: center;
            gap: 20px;
            padding: 20px 24px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        .content-item:hover {
            border-color: rgba(245, 158, 11, 0.25);
            box-shadow: var(--shadow-sm);
            transform: translateX(4px);
        }
        .content-item .thumb {
            width: 80px;
            height: 80px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            background: var(--border-color);
            flex-shrink: 0;
        }
        .content-item .info {
            flex: 1;
        }
        .content-item .info h4 {
            font-size: 1.05rem;
            margin-bottom: 4px;
        }
        .content-item .info p {
            font-size: 0.88rem;
            color: var(--text-muted);
            margin-bottom: 0;
        }
        .content-item .meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-top: 6px;
        }
        .content-item .meta i {
            margin-right: 4px;
        }

        /* ===== Stats ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 24px;
            text-align: center;
        }
        .stat-item {
            padding: 32px 16px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: var(--radius-lg);
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: var(--transition);
        }
        .stat-item:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(245, 158, 11, 0.2);
        }
        .stat-item .number {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1.2;
            margin-bottom: 4px;
        }
        .stat-item .label {
            font-size: 0.95rem;
            color: rgba(255, 255, 255, 0.7);
        }

        /* ===== 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-md);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(245, 158, 11, 0.2);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1.02rem;
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            color: var(--text-primary);
            transition: var(--transition);
            gap: 12px;
        }
        .faq-question i {
            color: var(--accent);
            transition: 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 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-box {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            border-radius: var(--radius-xl);
            padding: 56px 48px;
            text-align: center;
            border: 1px solid rgba(255, 255, 255, 0.08);
            position: relative;
            overflow: hidden;
        }
        .cta-box::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(245, 158, 11, 0.08), transparent 70%);
            pointer-events: none;
        }
        .cta-box h2 {
            color: var(--text-light);
            margin-bottom: 12px;
        }
        .cta-box p {
            color: rgba(255, 255, 255, 0.7);
            max-width: 560px;
            margin: 0 auto 28px;
            font-size: 1.05rem;
        }
        .cta-box .btn {
            font-size: 1.05rem;
            padding: 14px 36px;
        }

        /* ===== Footer ===== */
        footer {
            background: var(--primary-dark);
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding: 56px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            margin-bottom: 16px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.55);
            max-width: 320px;
            line-height: 1.7;
        }
        .footer-col h4 {
            color: var(--text-light);
            font-size: 1rem;
            margin-bottom: 16px;
            font-weight: 600;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.9rem;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .footer-col ul li a:hover {
            color: var(--accent);
            transform: translateX(4px);
        }
        .footer-col ul li a i {
            font-size: 0.85rem;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
        }
        .footer-bottom p {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
            margin-bottom: 0;
        }
        .footer-bottom-links {
            display: flex;
            gap: 20px;
        }
        .footer-bottom-links a {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
            transition: var(--transition);
        }
        .footer-bottom-links a:hover {
            color: var(--accent);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }

        @media (max-width: 768px) {
            :root {
                --header-height: 64px;
            }
            .section-padding {
                padding: 56px 0;
            }
            .section-padding-sm {
                padding: 40px 0;
            }
            .section-title {
                margin-bottom: 32px;
            }
            .nav-tabs {
                display: none;
                position: absolute;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(15, 23, 42, 0.98);
                backdrop-filter: blur(16px);
                flex-direction: column;
                padding: 16px;
                border-radius: 0 0 var(--radius-md) var(--radius-md);
                box-shadow: var(--shadow-xl);
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            }
            .nav-tabs.open {
                display: flex;
            }
            .nav-tab {
                width: 100%;
                text-align: center;
                padding: 12px 16px;
                font-size: 1rem;
            }
            .mobile-toggle {
                display: block;
            }
            .header-cta .btn-primary {
                padding: 8px 16px;
                font-size: 0.82rem;
            }
            .header-cta .btn-primary span {
                display: none;
            }
            .category-hero {
                padding: 110px 0 56px;
            }
            .category-hero-content h1 {
                font-size: 1.8rem;
            }
            .category-hero-content p {
                font-size: 1rem;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .card-grid-3,
            .card-grid-4 {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .content-item {
                flex-direction: column;
                align-items: flex-start;
                padding: 16px;
            }
            .content-item .thumb {
                width: 100%;
                height: 160px;
            }
            .cta-box {
                padding: 40px 24px;
            }
            .cta-box h2 {
                font-size: 1.5rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .footer-bottom-links {
                justify-content: center;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .category-hero-content h1 {
                font-size: 1.5rem;
            }
            .category-hero-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .category-hero-actions .btn {
                justify-content: center;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .stat-item {
                padding: 20px 12px;
            }
            .stat-item .number {
                font-size: 2rem;
            }
            .faq-question {
                font-size: 0.95rem;
                padding: 14px 16px;
            }
            .faq-answer {
                padding: 0 16px;
                font-size: 0.9rem;
            }
            .faq-item.open .faq-answer {
                padding: 0 16px 16px;
            }
        }

        /* ===== Animations ===== */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .animate-in {
            animation: fadeInUp 0.6s ease forwards;
        }
        .animate-delay-1 {
            animation-delay: 0.1s;
        }
        .animate-delay-2 {
            animation-delay: 0.2s;
        }
        .animate-delay-3 {
            animation-delay: 0.3s;
        }
        .animate-delay-4 {
            animation-delay: 0.4s;
        }