/* roulang page: index */
:root {
      --primary-deep: #1A1A2E;
      --accent-gold: #C9A96E;
      --highlight-gold: #D4AF37;
      --bg-warm: #FAFAF7;
      --dark-bg: #0F0F1A;
      --text-main: #2C2C2C;
      --text-secondary: #6B6B6B;
      --text-light: #F5F5F0;
      --border-soft: #E5E0D5;
      --card-shadow: 0 2px 12px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 6px 20px rgba(0,0,0,0.08);
      --radius-card: 8px;
      --radius-btn: 4px;
      --radius-testimonial: 12px;
      --transition-smooth: 0.3s ease;
      --font-serif: 'Songti SC', 'Noto Serif CJK SC', 'Times New Roman', serif;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-mono: 'SF Mono', 'Menlo', 'Consolas', monospace;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      font-weight: 700;
      letter-spacing: 0.02em;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航栏 */
    .desktop-nav {
      background: rgba(250,250,247,0.95);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      height: 64px;
      display: flex;
      align-items: center;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      border-bottom: 1px solid var(--border-soft);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 20px;
      color: var(--primary-deep);
      text-decoration: none;
      letter-spacing: 0.05em;
    }

    .nav-links {
      display: flex;
      gap: 28px;
      list-style: none;
      margin: 0;
      padding: 0;
    }

    .nav-links a {
      color: var(--text-main);
      text-decoration: none;
      font-size: 15px;
      font-weight: 500;
      position: relative;
      padding-bottom: 4px;
      transition: color var(--transition-smooth);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-gold);
      transition: width var(--transition-smooth);
    }

    .nav-links a:hover {
      color: var(--accent-gold);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 56px;
      background: #FFFFFF;
      border-top: 1px solid var(--border-soft);
      z-index: 100;
      justify-content: space-around;
      align-items: center;
      box-shadow: 0 -2px 8px rgba(0,0,0,0.02);
    }

    .mobile-tab {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      color: var(--text-secondary);
      font-size: 10px;
      text-decoration: none;
      transition: color 0.2s;
      flex: 1;
      height: 100%;
    }

    .mobile-tab i {
      font-size: 20px;
      margin-bottom: 2px;
    }

    .mobile-tab.active, .mobile-tab:hover {
      color: var(--accent-gold);
    }

    /* 区块间距 */
    section {
      padding: 80px 0;
    }

    @media (max-width: 640px) {
      section {
        padding: 48px 0;
      }
      .desktop-nav {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      body {
        padding-bottom: 70px;
      }
      .container {
        padding: 0 20px;
      }
    }

    @media (min-width: 641px) {
      .mobile-bottom-nav {
        display: none;
      }
    }

    /* Hero */
    .hero {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      margin-top: 0;
      padding-top: 64px;
    }

    .hero-overlay {
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: rgba(0,0,0,0.45);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      text-align: left;
    }

    .hero h1 {
      font-size: 40px;
      color: #FFFFFF;
      margin-bottom: 18px;
      line-height: 1.3;
      text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    }

    .hero .subtitle {
      font-size: 18px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 32px;
      font-weight: 300;
    }

    .btn-primary {
      background: var(--highlight-gold);
      color: var(--primary-deep);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      display: inline-block;
      transition: background 0.25s ease, transform 0.2s;
      border: none;
      font-size: 16px;
      letter-spacing: 0.5px;
    }

    .btn-primary:hover {
      background: #B8962E;
      transform: scale(1.03);
      color: var(--primary-deep);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--accent-gold);
      color: var(--accent-gold);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: 0.25s ease;
    }

    .btn-secondary:hover {
      background: var(--accent-gold);
      color: var(--primary-deep);
    }

    @media (max-width: 640px) {
      .hero {
        min-height: 85vh;
        padding-top: 40px;
      }
      .hero h1 {
        font-size: 32px;
      }
      .hero .subtitle {
        font-size: 16px;
      }
      .btn-primary {
        padding: 14px 24px;
        width: 100%;
        text-align: center;
      }
    }

    /* 卡片系统 */
    .card-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      margin-top: 32px;
    }

    .card {
      background: #FFFFFF;
      border: 1px solid var(--border-soft);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--card-shadow);
      transition: transform 0.3s, box-shadow 0.3s;
      flex: 1 1 calc(33.333% - 20px);
      min-width: 250px;
    }

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

    .card-icon {
      font-size: 36px;
      color: var(--accent-gold);
      margin-bottom: 16px;
    }

    .card h4 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--primary-deep);
    }

    .card p {
      color: var(--text-secondary);
      font-size: 15px;
      line-height: 1.7;
    }

    @media (max-width: 640px) {
      .card-grid {
        flex-direction: column;
        gap: 16px;
      }
      .card {
        flex: 1 1 auto;
      }
    }

    /* 数据指标 */
    .metrics {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      text-align: center;
      margin-top: 24px;
    }

    .metric-item {
      padding: 16px;
    }

    .metric-number {
      font-family: var(--font-mono);
      font-size: 36px;
      font-weight: 700;
      color: var(--highlight-gold);
    }

    .metric-label {
      color: var(--text-secondary);
      font-size: 14px;
    }

    /* 证言卡片 */
    .testimonial-grid {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
      margin-top: 32px;
    }

    .testimonial {
      background: #F7F5F0;
      border-radius: var(--radius-testimonial);
      padding: 28px;
      flex: 1 1 calc(50% - 24px);
      display: flex;
      flex-direction: column;
    }

    .testimonial blockquote {
      font-style: italic;
      font-size: 16px;
      margin: 0 0 16px;
      color: var(--text-main);
      line-height: 1.6;
    }

    .testimonial-footer {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: auto;
    }

    .avatar-placeholder {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ccc url('/assets/images/coverpic/cover-3.webp') center/cover;
    }

    .author-info strong {
      display: block;
      font-size: 14px;
    }

    .author-info span {
      font-size: 13px;
      color: var(--text-secondary);
    }

    @media (max-width: 640px) {
      .testimonial-grid {
        flex-direction: column;
      }
      .testimonial {
        flex: 1 1 auto;
      }
    }

    /* FAQ */
    .accordion-title {
      font-size: 17px;
      font-weight: 500;
      color: var(--primary-deep);
      border-bottom: 1px solid var(--border-soft);
      padding: 14px 0;
      cursor: pointer;
      transition: color 0.3s;
    }

    .accordion-title:hover, .accordion-title[aria-expanded="true"] {
      color: var(--accent-gold);
    }

    .accordion-content {
      font-size: 15px;
      color: var(--text-secondary);
      padding: 8px 0 16px;
    }

    /* CTA 深色区 */
    .cta-section {
      background: var(--dark-bg);
      text-align: center;
    }

    .cta-section h2 {
      color: var(--text-light);
      font-size: 30px;
      margin-bottom: 16px;
    }

    .cta-section p {
      color: rgba(245,245,240,0.7);
      font-size: 16px;
      margin-bottom: 32px;
    }

    /* 页脚 */
    .footer {
      background: var(--dark-bg);
      color: #8A8A8A;
      padding: 48px 0 24px;
    }

    .footer-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 32px;
      justify-content: space-between;
      margin-bottom: 32px;
    }

    .footer-col {
      flex: 1 1 180px;
    }

    .footer-col h5 {
      color: var(--text-light);
      margin-bottom: 12px;
      font-size: 16px;
    }

    .footer-links {
      list-style: none;
      padding: 0;
      margin: 0;
    }

    .footer-links li {
      margin-bottom: 6px;
      font-size: 14px;
    }

    .footer-links a {
      color: #8A8A8A;
      text-decoration: none;
    }

    .copyright {
      text-align: center;
      font-size: 12px;
      border-top: 1px solid rgba(255,255,255,0.08);
      padding-top: 20px;
    }