/* roulang page: index */
:root {
      --primary: #C69C6D;
      --primary-soft: rgba(198, 156, 109, 0.18);
      --primary-glow: rgba(198, 156, 109, 0.35);
      --secondary: #2E2E2E;
      --accent: #1A7A6D;
      --bg-warm: #FAF8F5;
      --card-bg: #FFFFFF;
      --border-soft: #E5DFD7;
      --text-muted: #6b6256;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.03);
      --shadow-hover: 0 14px 32px rgba(0,0,0,0.06), 0 2px 6px rgba(0,0,0,0.04);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-serif: "PingFang SC", "Microsoft YaHei", "Noto Serif SC", serif;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--secondary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, .serif {
      font-family: var(--font-serif);
      font-weight: 600;
      letter-spacing: -0.3px;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    /* 导航卡片面板 */
    .nav-panel {
      background: var(--bg-warm);
      backdrop-filter: blur(8px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.02), 0 4px 12px rgba(0,0,0,0.03);
      position: sticky;
      top: 0;
      z-index: 50;
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid var(--border-soft);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo-text {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: 1px;
      text-decoration: none;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-link {
      color: var(--secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
    }
    .nav-link:hover {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: all 0.25s ease;
      text-decoration: none;
      display: inline-block;
      box-shadow: 0 2px 6px rgba(0,0,0,0.05);
    }
    .btn-primary:hover {
      background: #b8894f;
      box-shadow: 0 8px 18px rgba(198,156,109,0.25);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 1.8px solid var(--secondary);
      color: var(--secondary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: all 0.25s ease;
      text-decoration: none;
      display: inline-block;
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: rgba(198,156,109,0.04);
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 28px 24px;
      transition: all 0.25s ease;
      border: 1px solid rgba(229,223,215,0.5);
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-6px);
      border-color: transparent;
    }
    .section-title {
      font-size: 32px;
      font-weight: 650;
      margin-bottom: 14px;
      color: var(--secondary);
    }
    .section-sub {
      color: var(--text-muted);
      font-size: 17px;
      margin-bottom: 48px;
      max-width: 700px;
    }
    .accent-num {
      color: var(--accent);
      font-weight: 700;
      font-size: 44px;
      line-height: 1.2;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-soft);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--secondary);
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.2s;
      color: var(--text-muted);
      font-size: 16px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    .faq-item.active .faq-question i {
      transform: rotate(45deg);
      color: var(--primary);
    }
    footer {
      background: #2E2E2E;
      color: #EAE5DB;
      padding: 60px 0 24px;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
        font-size: 26px;
        color: var(--secondary);
        background: none;
        border: none;
      }
      .mobile-panel {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(250,248,245,0.98);
        backdrop-filter: blur(24px);
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 28px;
        z-index: 100;
        transform: translateX(100%);
        transition: transform 0.3s ease;
      }
      .mobile-panel.open {
        transform: translateX(0);
      }
      .mobile-link {
        font-size: 22px;
        font-weight: 600;
        color: var(--secondary);
        text-decoration: none;
        padding: 12px 28px;
        background: white;
        border-radius: 48px;
        box-shadow: var(--shadow-sm);
      }
      .section-title {
        font-size: 26px;
      }
    }
    @media (min-width: 769px) {
      .mobile-menu-btn, .mobile-panel {
        display: none;
      }
    }
    .hero-img-placeholder {
      background: linear-gradient(135deg, #f3ede7 0%, #e8dfd3 100%);
      border-radius: 24px;
      width: 100%;
      height: 380px;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-sm);
    }
    .process-step {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }