/* roulang page: index */
:root {
  --primary: #1a2a6c;
  --primary-light: #2d4a8e;
  --primary-dark: #0f1a4a;
  --accent: #f59e0b;
  --accent-light: #fbbf24;
  --accent-dark: #d97706;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --bg-dark: #0f172a;
  --text: #1e293b;
  --text-secondary: #475569;
  --text-light: #94a3b8;
  --text-white: #ffffff;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.12);
  --shadow-xl: 0 24px 64px rgba(0,0,0,0.16);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
  --max-width: 1200px;
  --header-height: 72px;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent); }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
input, textarea { font-family: inherit; font-size: 1rem; }
ul, ol { list-style: none; }

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

.section-padding { padding: 80px 0; }
.section-padding-sm { padding: 56px 0; }
.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 12px;
  color: var(--primary-dark);
}
.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto 48px;
  text-align: center;
}
.text-center { text-align: center; }

/* ===== Header / Nav ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  z-index: 1000;
  transition: box-shadow var(--transition);
}
.header.scrolled { box-shadow: var(--shadow); }
.header-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
}
.nav-left, .nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
}
.nav-right { justify-content: flex-end; }
.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  position: relative;
}
.nav-link:hover { color: var(--primary); background: rgba(26,42,108,0.06); }
.nav-link.active { color: var(--primary); font-weight: 600; }
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 3px;
  background: var(--accent);
  border-radius: 4px;
}
.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 32px;
  flex-shrink: 0;
}
.logo a {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--primary-dark);
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}
.logo a:hover { opacity: 0.85; }
.mobile-toggle { display: none; font-size: 1.5rem; color: var(--text); padding: 8px; }

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--header-height) + 40px) 24px 80px;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background-image: url('/assets/images/backpic/back-1.png');
  background-size: cover;
  background-position: center;
  opacity: 0.25;
  mix-blend-mode: overlay;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(245,158,11,0.12) 0%, transparent 60%);
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(255,255,255,0.12);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 100px;
  font-size: 0.875rem;
  color: var(--text-white);
  margin-bottom: 24px;
}
.hero-badge i { color: var(--accent); }
.hero-title {
  font-size: clamp(2.5rem, 6vw, 4.25rem);
  font-weight: 900;
  line-height: 1.1;
  color: var(--text-white);
  margin-bottom: 20px;
  letter-spacing: -1px;
}
.hero-title span { color: var(--accent); }
.hero-desc {
  font-size: 1.2rem;
  color: rgba(255,255,255,0.8);
  max-width: 600px;
  margin: 0 auto 36px;
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 34px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 100px;
  transition: all var(--transition);
  border: none;
  cursor: pointer;
}
.btn-primary {
  background: var(--accent);
  color: var(--primary-dark);
  box-shadow: 0 8px 32px rgba(245,158,11,0.35);
}
.btn-primary:hover { background: var(--accent-light); transform: translateY(-2px); box-shadow: 0 12px 40px rgba(245,158,11,0.45); color: var(--primary-dark); }
.btn-outline {
  background: transparent;
  color: var(--text-white);
  border: 2px solid rgba(255,255,255,0.3);
}
.btn-outline:hover { background: rgba(255,255,255,0.1); border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.btn-lg { padding: 18px 44px; font-size: 1.125rem; }

/* ===== Stats ===== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  margin-top: -60px;
  position: relative;
  z-index: 3;
}
.stat-card {
  background: var(--bg);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-light);
  transition: all var(--transition);
}
.stat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-xl); }
.stat-number {
  font-size: 2.5rem;
  font-weight: 900;
  color: var(--primary);
  line-height: 1.1;
  margin-bottom: 6px;
}
.stat-label { font-size: 0.95rem; color: var(--text-light); font-weight: 500; }

/* ===== Intro ===== */
.intro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.intro-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.intro-image img { width: 100%; height: 400px; object-fit: cover; transition: transform 0.6s; }
.intro-image:hover img { transform: scale(1.03); }
.intro-text h2 { font-size: 2rem; font-weight: 800; color: var(--primary-dark); margin-bottom: 16px; }
.intro-text p { color: var(--text-secondary); margin-bottom: 16px; font-size: 1.05rem; line-height: 1.8; }
.intro-features { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 24px; }
.intro-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: var(--bg-alt);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
}
.intro-feature i { color: var(--accent); font-size: 1.1rem; }

/* ===== Category Cards ===== */
.category-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.category-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}
.category-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.category-card img { width: 100%; height: 200px; object-fit: cover; }
.category-card-body { padding: 24px; }
.category-card-body h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 8px; color: var(--primary-dark); }
.category-card-body p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.6; margin-bottom: 16px; }
.category-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  background: var(--bg-alt);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--primary-light);
  font-weight: 500;
}

/* ===== Latest Posts ===== */
.latest-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.post-card {
  background: var(--bg);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}
.post-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.post-card img { width: 100%; height: 200px; object-fit: cover; }
.post-card-body { padding: 20px 24px 24px; }
.post-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
  font-size: 0.82rem;
  color: var(--text-light);
}
.post-meta .post-cat {
  padding: 2px 12px;
  background: var(--bg-alt);
  border-radius: 100px;
  color: var(--primary-light);
  font-weight: 500;
}
.post-card-body h3 { font-size: 1.1rem; font-weight: 700; line-height: 1.4; margin-bottom: 8px; color: var(--text); }
.post-card-body h3 a { color: inherit; }
.post-card-body h3 a:hover { color: var(--primary); }
.post-card-body p { font-size: 0.92rem; color: var(--text-secondary); line-height: 1.6; }
.empty-posts {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--text-light);
  font-size: 1.1rem;
  background: var(--bg-alt);
  border-radius: var(--radius);
}

/* ===== Features ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.feature-card {
  text-align: center;
  padding: 40px 28px;
  background: var(--bg);
  border-radius: var(--radius);
  border: 1px solid var(--border-light);
  transition: all var(--transition);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  color: #fff;
}
.feature-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 10px; color: var(--primary-dark); }
.feature-card p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7; }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: all var(--transition);
}
.faq-item:hover { border-color: var(--primary-light); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: color var(--transition);
}
.faq-question i { color: var(--text-light); transition: transform var(--transition); font-size: 1.1rem; }
.faq-item.active .faq-question i { transform: rotate(180deg); color: var(--accent); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0 24px;
  color: var(--text-secondary);
  line-height: 1.8;
}
.faq-item.active .faq-answer { max-height: 300px; padding: 0 24px 20px; }

/* ===== CTA ===== */
.cta-section {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url('/assets/images/backpic/back-2.png');
  background-size: cover;
  background-position: center;
  opacity: 0.1;
  mix-blend-mode: overlay;
}
.cta-content { position: relative; z-index: 1; text-align: center; padding: 80px 24px; }
.cta-content h2 { font-size: 2.5rem; font-weight: 800; color: var(--text-white); margin-bottom: 16px; }
.cta-content p { color: rgba(255,255,255,0.8); font-size: 1.15rem; max-width: 560px; margin: 0 auto 32px; }

/* ===== Footer ===== */
.footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 48px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 32px;
}
.footer-brand .logo-footer {
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 12px;
  display: inline-block;
}
.footer-brand p { font-size: 0.92rem; line-height: 1.7; max-width: 360px; }
.footer h4 { font-size: 1rem; font-weight: 700; color: #fff; margin-bottom: 16px; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { color: rgba(255,255,255,0.6); font-size: 0.9rem; transition: color var(--transition); }
.footer-links a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.4);
}
.footer-bottom a { color: rgba(255,255,255,0.5); }
.footer-bottom a:hover { color: var(--accent); }

/* ===== Mobile ===== */
@media (max-width: 1024px) {
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; margin-top: -40px; }
  .category-grid, .latest-grid, .features-grid { grid-template-columns: repeat(2, 1fr); }
  .intro-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  :root { --header-height: 64px; }
  .section-padding { padding: 48px 0; }
  .section-padding-sm { padding: 36px 0; }
  .section-title { font-size: 1.75rem; }
  
  .nav-left, .nav-right { display: none; }
  .mobile-toggle { display: block; }
  .logo { padding: 0 16px; }
  .header-inner { justify-content: space-between; }
  
  .mobile-menu-open .nav-left,
  .mobile-menu-open .nav-right {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: rgba(255,255,255,0.98);
    backdrop-filter: blur(16px);
    padding: 16px 24px 24px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    gap: 4px;
    z-index: 999;
  }
  .mobile-menu-open .nav-left { top: calc(var(--header-height) + 0px); }
  .mobile-menu-open .nav-right { top: calc(var(--header-height) + 180px); }
  .mobile-menu-open .nav-link { width: 100%; padding: 12px 16px; font-size: 1rem; }
  .mobile-menu-open .nav-link.active::after { display: none; }
  .mobile-menu-open .nav-link.active { background: rgba(26,42,108,0.08); border-radius: var(--radius-sm); }
  
  .hero { min-height: 90vh; padding: calc(var(--header-height) + 24px) 20px 60px; }
  .hero-title { font-size: 2.2rem; }
  .hero-desc { font-size: 1rem; }
  .btn-lg { padding: 14px 32px; font-size: 1rem; }
  
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: -32px; }
  .stat-number { font-size: 1.8rem; }
  
  .category-grid, .latest-grid { grid-template-columns: 1fr; gap: 20px; }
  .features-grid { grid-template-columns: 1fr; gap: 20px; }
  .intro-features { grid-template-columns: 1fr; }
  .intro-image img { height: 240px; }
  
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .cta-content h2 { font-size: 1.8rem; }
  .cta-content { padding: 48px 20px; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero { padding: calc(var(--header-height) + 16px) 16px 40px; }
  .hero-title { font-size: 1.8rem; }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; justify-content: center; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .stat-card { padding: 20px 16px; }
  .stat-number { font-size: 1.5rem; }
  .section-title { font-size: 1.5rem; }
  .faq-question { padding: 16px 18px; font-size: 0.95rem; }
}

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --primary-50: #eff6ff;
            --secondary: #7c3aed;
            --secondary-light: #ede9fe;
            --accent: #06b6d4;
            --accent-light: #ecfeff;
            --success: #10b981;
            --warning: #f59e0b;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --bg-dark-soft: #1e293b;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #f8fafc;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
            --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.08);
            --shadow-xl: 0 24px 64px rgba(0, 0, 0, 0.12);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --max-width: 1200px;
            --header-h: 72px;
        }

        /* ===== 基础 Reset ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        a:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
            border-radius: 2px;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text);
        }
        p {
            margin-bottom: 1em;
        }
        p:last-child {
            margin-bottom: 0;
        }

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

        /* ===== 头部导航 ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-h);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px) saturate(180%);
            -webkit-backdrop-filter: blur(16px) saturate(180%);
            border-bottom: 1px solid var(--border);
            transition: box-shadow var(--transition);
        }
        .header.scrolled {
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            gap: 16px;
        }
        .header-left,
        .header-right {
            display: flex;
            align-items: center;
            gap: 4px;
            flex: 1;
        }
        .header-left {
            justify-content: flex-start;
        }
        .header-right {
            justify-content: flex-end;
        }
        .header-center {
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        .logo {
            font-size: 22px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 8px;
            transition: opacity var(--transition);
        }
        .logo:hover {
            opacity: 0.8;
            color: var(--text);
        }
        .logo i {
            color: var(--primary);
            font-size: 26px;
        }
        .logo span {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        /* 导航链接 */
        .nav-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 16px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-light);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            white-space: nowrap;
            position: relative;
        }
        .nav-link i {
            font-size: 14px;
        }
        .nav-link:hover {
            color: var(--primary);
            background: var(--primary-50);
        }
        .nav-link.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--primary);
            border-radius: 4px;
        }

        /* 汉堡按钮 */
        .menu-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--text);
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .menu-toggle:hover {
            background: var(--bg-alt);
        }

        /* 移动端导航 */
        @media (max-width: 768px) {
            .header-left,
            .header-right {
                display: none;
                position: absolute;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(16px);
                -webkit-backdrop-filter: blur(16px);
                flex-direction: column;
                padding: 12px 16px 20px;
                gap: 4px;
                border-bottom: 1px solid var(--border);
                box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
                z-index: 999;
            }
            .header-left.open,
            .header-right.open {
                display: flex;
            }
            .header-left {
                top: var(--header-h);
            }
            .header-right {
                top: calc(var(--header-h) + 160px);
            }
            .header-left .nav-link,
            .header-right .nav-link {
                width: 100%;
                padding: 12px 16px;
                font-size: 16px;
            }
            .nav-link.active::after {
                display: none;
            }
            .menu-toggle {
                display: block;
            }
            .header-center {
                flex: 1;
                justify-content: center;
            }
            .logo {
                font-size: 18px;
            }
            .logo i {
                font-size: 22px;
            }
        }
        @media (max-width: 520px) {
            .header-left {
                top: var(--header-h);
            }
            .header-right {
                top: calc(var(--header-h) + 140px);
            }
            .logo {
                font-size: 16px;
            }
            .logo i {
                font-size: 20px;
            }
        }

        /* ===== 页面主体 ===== */
        .main {
            padding-top: var(--header-h);
        }

        /* ===== Banner ===== */
        .category-banner {
            position: relative;
            padding: 100px 0 80px;
            background: var(--bg-dark);
            overflow: hidden;
            min-height: 360px;
            display: flex;
            align-items: center;
        }
        .category-banner .bg-img {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            opacity: 0.35;
            transition: opacity 0.6s;
        }
        .category-banner .overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.88) 0%, rgba(30, 41, 59, 0.72) 100%);
        }
        .category-banner .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .category-banner h1 {
            font-size: 42px;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .category-banner h1 i {
            color: var(--accent);
            margin-right: 12px;
        }
        .category-banner p {
            font-size: 18px;
            color: rgba(248, 250, 252, 0.8);
            max-width: 680px;
            margin: 0 auto 24px;
            line-height: 1.7;
        }
        .category-banner .badge-group {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
        }
        .category-banner .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 18px;
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.18);
            border-radius: 40px;
            font-size: 13px;
            color: var(--text-white);
            font-weight: 500;
        }
        .category-banner .badge i {
            color: var(--accent);
            font-size: 12px;
        }
        @media (max-width: 768px) {
            .category-banner {
                padding: 80px 0 60px;
                min-height: 300px;
            }
            .category-banner h1 {
                font-size: 28px;
            }
            .category-banner p {
                font-size: 15px;
            }
        }
        @media (max-width: 520px) {
            .category-banner h1 {
                font-size: 24px;
            }
            .category-banner h1 i {
                margin-right: 6px;
            }
            .category-banner .badge {
                font-size: 12px;
                padding: 4px 14px;
            }
        }

        /* ===== 通用板块 ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-alt);
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section-dark h2,
        .section-dark h3,
        .section-dark h4 {
            color: var(--text-white);
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header h2 {
            font-size: 32px;
            font-weight: 800;
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }
        .section-header h2 i {
            color: var(--primary);
            margin-right: 8px;
        }
        .section-header p {
            font-size: 17px;
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto;
        }
        .section-header .subtitle-icon {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 4px 20px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 40px;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .section-dark .section-header p {
            color: rgba(248, 250, 252, 0.7);
        }
        .section-dark .section-header .subtitle-icon {
            background: rgba(255, 255, 255, 0.12);
            color: var(--accent);
        }
        @media (max-width: 768px) {
            .section {
                padding: 56px 0;
            }
            .section-header {
                margin-bottom: 32px;
            }
            .section-header h2 {
                font-size: 24px;
            }
            .section-header p {
                font-size: 15px;
            }
        }

        /* ===== 分类介绍板块 ===== */
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .intro-content .tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 16px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 40px;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .intro-content h2 {
            font-size: 30px;
            font-weight: 800;
            margin-bottom: 16px;
            line-height: 1.3;
        }
        .intro-content p {
            color: var(--text-light);
            margin-bottom: 20px;
            font-size: 16px;
            line-height: 1.8;
        }
        .intro-content .feature-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .intro-content .feature-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 15px;
            color: var(--text);
        }
        .intro-content .feature-list li i {
            color: var(--success);
            font-size: 18px;
            margin-top: 2px;
            flex-shrink: 0;
        }
        .intro-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            position: relative;
        }
        .intro-image img {
            width: 100%;
            height: 400px;
            object-fit: cover;
            display: block;
            transition: transform 0.5s ease;
        }
        .intro-image:hover img {
            transform: scale(1.03);
        }
        .intro-image .img-label {
            position: absolute;
            bottom: 16px;
            left: 16px;
            padding: 6px 18px;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(8px);
            border-radius: 40px;
            font-size: 13px;
            color: #fff;
            font-weight: 500;
        }
        @media (max-width: 900px) {
            .intro-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .intro-content h2 {
                font-size: 24px;
            }
            .intro-image img {
                height: 280px;
            }
        }
        @media (max-width: 520px) {
            .intro-content h2 {
                font-size: 20px;
            }
            .intro-content p {
                font-size: 14px;
            }
            .intro-image img {
                height: 200px;
            }
        }

        /* ===== 流程板块 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 24px;
            counter-reset: step;
        }
        .step-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 32px 24px;
            text-align: center;
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }
        .step-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-light);
        }
        .step-card .step-num {
            counter-increment: step;
            font-size: 48px;
            font-weight: 800;
            color: var(--primary-light);
            line-height: 1;
            margin-bottom: 8px;
            transition: color var(--transition);
        }
        .step-card:hover .step-num {
            color: var(--primary);
        }
        .step-card .step-icon {
            font-size: 32px;
            color: var(--primary);
            margin-bottom: 16px;
            display: block;
        }
        .step-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .step-card p {
            font-size: 14px;
            color: var(--text-light);
            margin-bottom: 0;
            line-height: 1.6;
        }
        .step-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            opacity: 0;
            transition: opacity var(--transition);
        }
        .step-card:hover::before {
            opacity: 1;
        }
        @media (max-width: 768px) {
            .steps-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .step-card {
                padding: 24px 16px;
            }
            .step-card .step-num {
                font-size: 36px;
            }
        }
        @media (max-width: 520px) {
            .steps-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== 卡片网格 ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 24px;
        }
        .card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: var(--primary-light);
        }
        .card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            display: block;
            border-radius: 0;
            transition: transform 0.5s ease;
        }
        .card:hover .card-img {
            transform: scale(1.04);
        }
        .card-img-wrap {
            overflow: hidden;
            position: relative;
        }
        .card-img-wrap .card-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            padding: 4px 14px;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(8px);
            border-radius: 40px;
            font-size: 12px;
            color: #fff;
            font-weight: 500;
            border: 1px solid rgba(255, 255, 255, 0.15);
        }
        .card-body {
            padding: 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .card-body h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .card-body h3 a {
            color: var(--text);
        }
        .card-body h3 a:hover {
            color: var(--primary);
        }
        .card-body p {
            font-size: 14px;
            color: var(--text-light);
            margin-bottom: 16px;
            flex: 1;
            line-height: 1.6;
        }
        .card-body .card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 13px;
            color: var(--text-light);
            padding-top: 12px;
            border-top: 1px solid var(--border-light);
        }
        .card-body .card-meta i {
            margin-right: 4px;
        }
        .card-body .card-meta .badge-sm {
            padding: 2px 12px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 40px;
            font-size: 12px;
            font-weight: 600;
        }
        @media (max-width: 600px) {
            .card-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .card-img {
                height: 140px;
            }
            .card-body {
                padding: 14px;
            }
            .card-body h3 {
                font-size: 15px;
            }
            .card-body p {
                font-size: 13px;
            }
        }
        @media (max-width: 420px) {
            .card-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== 注意事项 ===== */
        .notice-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 20px;
        }
        .notice-item {
            display: flex;
            gap: 16px;
            padding: 20px 24px;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            transition: all var(--transition);
        }
        .notice-item:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow);
        }
        .notice-item .icon-box {
            flex-shrink: 0;
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            background: var(--accent-light);
            color: var(--accent);
        }
        .notice-item .icon-box.warn {
            background: #fef3c7;
            color: var(--warning);
        }
        .notice-item .icon-box.info {
            background: var(--primary-light);
            color: var(--primary);
        }
        .notice-item .icon-box.success {
            background: #d1fae5;
            color: var(--success);
        }
        .notice-item h4 {
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 4px;
        }
        .notice-item p {
            font-size: 14px;
            color: var(--text-light);
            margin-bottom: 0;
            line-height: 1.6;
        }
        @media (max-width: 600px) {
            .notice-item {
                padding: 16px 18px;
            }
            .notice-item .icon-box {
                width: 40px;
                height: 40px;
                font-size: 16px;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-light);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 18px 24px;
            background: none;
            border: none;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: var(--text);
            text-align: left;
            transition: all var(--transition);
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question i {
            color: var(--primary);
            font-size: 18px;
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(45deg);
        }
        .faq-answer {
            padding: 0 24px 18px;
            font-size: 15px;
            color: var(--text-light);
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        .faq-answer p {
            margin-bottom: 0;
        }
        @media (max-width: 768px) {
            .faq-question {
                padding: 14px 18px;
                font-size: 14px;
            }
            .faq-answer {
                padding: 0 18px 14px;
                font-size: 14px;
            }
        }

        /* ===== CTA ===== */
        .cta-box {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: var(--radius-xl);
            padding: 64px 48px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-box::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-box * {
            position: relative;
            z-index: 2;
        }
        .cta-box h2 {
            font-size: 32px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-box p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.85);
            max-width: 560px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }
        .cta-box .btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            justify-content: center;
        }
        .cta-box .btn {
            padding: 14px 36px;
            border-radius: 40px;
            font-size: 16px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .cta-box .btn-primary {
            background: #fff;
            color: var(--primary);
        }
        .cta-box .btn-primary:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
        }
        .cta-box .btn-outline {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.5);
        }
        .cta-box .btn-outline:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
            transform: translateY(-2px);
        }
        @media (max-width: 768px) {
            .cta-box {
                padding: 40px 24px;
            }
            .cta-box h2 {
                font-size: 24px;
            }
            .cta-box p {
                font-size: 15px;
            }
            .cta-box .btn {
                padding: 12px 28px;
                font-size: 14px;
            }
        }
        @media (max-width: 520px) {
            .cta-box {
                padding: 32px 16px;
            }
            .cta-box h2 {
                font-size: 20px;
            }
        }

        /* ===== 通用按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 40px;
            font-size: 15px;
            font-weight: 600;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            text-decoration: none;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37, 99, 235, 0.3);
            color: #fff;
        }
        .btn-secondary {
            background: var(--secondary);
            color: #fff;
        }
        .btn-secondary:hover {
            background: #6d28d9;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(124, 58, 237, 0.3);
            color: #fff;
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 8px 20px;
            font-size: 13px;
        }
        .btn-lg {
            padding: 16px 40px;
            font-size: 17px;
        }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--bg-dark);
            color: rgba(248, 250, 252, 0.7);
            padding: 60px 0 0;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer-brand .logo-footer {
            font-size: 22px;
            font-weight: 800;
            color: #fff;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 12px;
            transition: opacity var(--transition);
        }
        .footer-brand .logo-footer:hover {
            opacity: 0.8;
            color: #fff;
        }
        .footer-brand .logo-footer i {
            color: var(--accent);
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            max-width: 360px;
        }
        .footer h4 {
            font-size: 15px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links li a {
            color: rgba(248, 250, 252, 0.65);
            font-size: 14px;
            transition: all var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .footer-links li a:hover {
            color: #fff;
            transform: translateX(4px);
        }
        .footer-links li a i {
            font-size: 12px;
            color: var(--accent);
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            padding: 24px 0;
            font-size: 13px;
            color: rgba(248, 250, 252, 0.45);
        }
        .footer-bottom a {
            color: rgba(248, 250, 252, 0.55);
        }
        .footer-bottom a:hover {
            color: #fff;
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer {
                padding-top: 40px;
            }
        }

        /* ===== 滚动动画 ===== */
        .fade-up {
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.6s ease, transform 0.6s ease;
        }
        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* ===== 辅助 ===== */
        .text-center {
            text-align: center;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .gap-8 {
            gap: 8px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --primary-bg: #eff6ff;
            --secondary: #0ea5e9;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --text: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow: 0 4px 20px rgba(0,0,0,0.07);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.1);
            --shadow-hover: 0 20px 50px rgba(0,0,0,0.12);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        a:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; border-radius: 4px; }
        button, input, textarea, select { font-family: inherit; font-size: 1rem; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text); }
        h1 { font-size: 2.5rem; letter-spacing: -0.02em; }
        h2 { font-size: 2rem; letter-spacing: -0.01em; }
        h3 { font-size: 1.5rem; }
        h4 { font-size: 1.2rem; }
        p { margin-bottom: 1rem; color: var(--text-secondary); }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header & Navigation ===== */
        .header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(16px) saturate(180%);
            -webkit-backdrop-filter: blur(16px) saturate(180%);
            border-bottom: 1px solid var(--border);
            height: var(--header-height);
            display: flex;
            align-items: center;
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .logo {
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.03em;
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo i { color: var(--primary); font-size: 1.6rem; }
        .logo span { background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .logo:hover { opacity: 0.85; }

        .nav-wrapper {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .nav-left, .nav-right {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-link {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            white-space: nowrap;
        }
        .nav-link i { margin-right: 6px; font-size: 0.85rem; }
        .nav-link:hover { color: var(--primary); background: var(--primary-bg); }
        .nav-link.active {
            color: var(--primary);
            background: var(--primary-bg);
            font-weight: 600;
            box-shadow: inset 0 -2px 0 var(--primary);
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text);
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .nav-toggle:hover { background: var(--bg-alt); }

        /* Mobile Nav */
        .mobile-nav {
            display: none;
            position: fixed;
            top: var(--header-height);
            left: 0;
            right: 0;
            background: rgba(255,255,255,0.98);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            padding: 16px 24px;
            flex-direction: column;
            gap: 8px;
            z-index: 99;
            box-shadow: var(--shadow-lg);
            max-height: calc(100vh - var(--header-height));
            overflow-y: auto;
            transform: translateY(-10px);
            opacity: 0;
            pointer-events: none;
            transition: all 0.3s ease;
        }
        .mobile-nav.open {
            transform: translateY(0);
            opacity: 1;
            pointer-events: auto;
        }
        .mobile-nav .nav-link {
            padding: 12px 16px;
            font-size: 1rem;
            border-radius: var(--radius-sm);
        }
        .mobile-nav .nav-link i { width: 24px; text-align: center; }

        /* ===== Hero Banner (Inner) ===== */
        .page-hero {
            position: relative;
            padding: 80px 0 64px;
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
            overflow: hidden;
            min-height: 260px;
            display: flex;
            align-items: center;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .page-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(37,99,235,0.15) 0%, transparent 60%),
                        radial-gradient(ellipse at 70% 50%, rgba(14,165,233,0.1) 0%, transparent 60%);
        }
        .page-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .page-hero h1 {
            color: #fff;
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: 12px;
            text-shadow: 0 2px 20px rgba(0,0,0,0.3);
        }
        .page-hero .breadcrumb {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            font-size: 0.9rem;
            color: rgba(255,255,255,0.7);
            flex-wrap: wrap;
        }
        .page-hero .breadcrumb a { color: rgba(255,255,255,0.8); }
        .page-hero .breadcrumb a:hover { color: #fff; }
        .page-hero .breadcrumb .sep { color: rgba(255,255,255,0.4); }
        .page-hero .breadcrumb .current { color: var(--accent); font-weight: 500; }
        .page-hero .meta-badge {
            display: inline-flex;
            align-items: center;
            gap: 16px;
            margin-top: 16px;
            padding: 8px 20px;
            background: rgba(255,255,255,0.1);
            backdrop-filter: blur(8px);
            border-radius: 50px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.85);
        }
        .page-hero .meta-badge i { margin-right: 4px; color: var(--accent); }
        .page-hero .meta-badge .tag {
            display: inline-block;
            padding: 2px 12px;
            background: var(--primary);
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            color: #fff;
        }

        /* ===== Article Main ===== */
        .article-main {
            padding: 60px 0 80px;
            background: var(--bg);
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 48px;
            align-items: start;
        }

        /* Article Content */
        .article-body {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            overflow: hidden;
        }
        .article-body .article-inner {
            padding: 40px 44px;
        }
        .article-body .article-meta-top {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px;
            margin-bottom: 28px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--border-light);
        }
        .article-body .meta-item {
            font-size: 0.85rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .article-body .meta-item i { color: var(--primary-light); }
        .article-body .meta-item .category-badge {
            display: inline-block;
            padding: 2px 14px;
            background: var(--primary-bg);
            color: var(--primary);
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
        }
        .article-body .content {
            font-size: 1.05rem;
            line-height: 1.9;
            color: var(--text-secondary);
        }
        .article-body .content h2,
        .article-body .content h3,
        .article-body .content h4 {
            margin-top: 1.8em;
            margin-bottom: 0.8em;
            color: var(--text);
        }
        .article-body .content p {
            margin-bottom: 1.2em;
        }
        .article-body .content ul,
        .article-body .content ol {
            margin-bottom: 1.2em;
            padding-left: 1.5em;
        }
        .article-body .content li {
            margin-bottom: 0.4em;
            list-style: disc;
            color: var(--text-secondary);
        }
        .article-body .content a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-body .content a:hover { color: var(--primary-dark); }
        .article-body .content img {
            border-radius: var(--radius-sm);
            margin: 1.5em 0;
            box-shadow: var(--shadow-sm);
        }
        .article-body .content blockquote {
            border-left: 4px solid var(--primary);
            padding: 16px 24px;
            margin: 1.5em 0;
            background: var(--primary-bg);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-body .content code {
            background: var(--bg-alt);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
            color: var(--primary-dark);
        }
        .article-body .content pre {
            background: #0f172a;
            padding: 20px 24px;
            border-radius: var(--radius-sm);
            overflow-x: auto;
            margin: 1.5em 0;
        }
        .article-body .content pre code {
            background: transparent;
            color: #e2e8f0;
            padding: 0;
        }

        /* Article Not Found */
        .article-not-found {
            text-align: center;
            padding: 80px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
        }
        .article-not-found i {
            font-size: 4rem;
            color: var(--text-muted);
            margin-bottom: 20px;
            display: block;
        }
        .article-not-found h2 {
            font-size: 1.8rem;
            margin-bottom: 12px;
        }
        .article-not-found p {
            color: var(--text-muted);
            margin-bottom: 24px;
        }
        .article-not-found .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: all var(--transition);
        }
        .article-not-found .btn-back:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow); }

        /* ===== Sidebar ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 32px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            padding: 28px 24px;
            box-shadow: var(--shadow-sm);
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .sidebar-card h3 i { color: var(--primary); font-size: 1.2rem; }
        .sidebar-card .sidebar-list { display: flex; flex-direction: column; gap: 12px; }
        .sidebar-card .sidebar-list a {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 10px 14px;
            border-radius: var(--radius-sm);
            background: var(--bg-alt);
            transition: all var(--transition);
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.4;
        }
        .sidebar-card .sidebar-list a:hover {
            background: var(--primary-bg);
            color: var(--primary);
            transform: translateX(4px);
        }
        .sidebar-card .sidebar-list a .num {
            flex-shrink: 0;
            width: 26px;
            height: 26px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: var(--primary);
            color: #fff;
            border-radius: 50%;
            font-size: 0.75rem;
            font-weight: 700;
        }
        .sidebar-card .sidebar-list a .num.alt { background: var(--text-muted); }

        .sidebar-cta {
            background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
            border: none;
            color: #fff;
            text-align: center;
        }
        .sidebar-cta h3 { color: #fff; justify-content: center; }
        .sidebar-cta h3 i { color: rgba(255,255,255,0.8); }
        .sidebar-cta p { color: rgba(255,255,255,0.85); font-size: 0.9rem; margin-bottom: 20px; }
        .sidebar-cta .btn-cta-side {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            background: rgba(255,255,255,0.2);
            backdrop-filter: blur(8px);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: all var(--transition);
            border: 1px solid rgba(255,255,255,0.25);
        }
        .sidebar-cta .btn-cta-side:hover { background: rgba(255,255,255,0.35); transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,0,0,0.2); }

        /* ===== FAQ Section ===== */
        .article-faq {
            margin-top: 48px;
            padding: 48px 0 0;
            border-top: 1px solid var(--border);
        }
        .article-faq h2 {
            font-size: 1.6rem;
            margin-bottom: 28px;
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .article-faq h2 i { color: var(--primary); }
        .faq-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }
        .faq-item {
            background: var(--bg-alt);
            border-radius: var(--radius-sm);
            padding: 20px 24px;
            border: 1px solid var(--border-light);
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: var(--border); box-shadow: var(--shadow-sm); }
        .faq-item h4 { font-size: 1rem; font-weight: 600; margin-bottom: 6px; color: var(--text); display: flex; align-items: center; gap: 8px; }
        .faq-item h4 i { color: var(--primary); font-size: 0.9rem; }
        .faq-item p { font-size: 0.92rem; color: var(--text-muted); margin-bottom: 0; }

        /* ===== Footer ===== */
        .footer {
            background: #0f172a;
            color: rgba(255,255,255,0.7);
            padding: 60px 0 0;
        }
        .footer .container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1.5fr;
            gap: 48px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .logo-footer {
            font-size: 1.5rem;
            font-weight: 800;
            color: #fff;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
        }
        .footer-brand .logo-footer i { color: var(--primary-light); }
        .footer-brand p { font-size: 0.9rem; color: rgba(255,255,255,0.55); line-height: 1.7; max-width: 380px; }
        .footer h4 { font-size: 1rem; font-weight: 700; color: #fff; margin-bottom: 20px; }
        .footer-links { display: flex; flex-direction: column; gap: 12px; }
        .footer-links li a {
            color: rgba(255,255,255,0.55);
            font-size: 0.9rem;
            transition: all var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .footer-links li a:hover { color: #fff; padding-left: 4px; }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            padding: 24px 0 32px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: #fff; }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            border: none;
            cursor: pointer;
            text-decoration: none;
        }
        .btn-primary { background: var(--primary); color: #fff; }
        .btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: var(--shadow); color: #fff; }
        .btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
        .btn-outline:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
        .btn-lg { padding: 16px 36px; font-size: 1.05rem; }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-layout { grid-template-columns: 1fr; }
            .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
            .faq-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        }

        @media (max-width: 768px) {
            .header .container { padding: 0 16px; }
            .nav-left, .nav-right { display: none; }
            .nav-toggle { display: block; }
            .mobile-nav { display: flex; }

            .page-hero { padding: 56px 0 48px; min-height: 200px; }
            .page-hero h1 { font-size: 1.6rem; }
            .page-hero .meta-badge { flex-wrap: wrap; justify-content: center; gap: 10px; font-size: 0.8rem; }

            .article-body .article-inner { padding: 24px 20px; }
            .article-body .article-meta-top { gap: 10px; }

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

            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            h1 { font-size: 1.8rem; }
            h2 { font-size: 1.5rem; }
        }

        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .page-hero h1 { font-size: 1.3rem; }
            .page-hero .meta-badge { font-size: 0.75rem; padding: 6px 14px; }
            .article-body .article-inner { padding: 16px 14px; }
            .sidebar-card { padding: 20px 16px; }
            .faq-item { padding: 16px; }
            .btn-lg { padding: 12px 24px; font-size: 0.95rem; }
            .logo { font-size: 1.1rem; }
            .logo i { font-size: 1.2rem; }
        }

        /* ===== Utility ===== */
        .text-center { text-align: center; }
        .mt-12 { margin-top: 12px; }
        .mb-8 { margin-bottom: 8px; }
        .gap-8 { gap: 8px; }

        /* Smooth transitions for interactive elements */
        .nav-link, .btn, .sidebar-card .sidebar-list a, .faq-item, .footer-links li a {
            will-change: transform, opacity, background, color;
        }