/* roulang page: index */
:root {
      --primary: #5B2C8E;
      --primary-light: #7A4BAF;
      --accent: #D4AF37;
      --accent-light: #F3E1A4;
      --bg-dark: #1E1A2F;
      --bg-light: #F9F7FC;
      --text-heading: #1a1a1a;
      --text-body: #4a4a5a;
      --text-muted: #8a8a9a;
      --border-light: #E8E5F0;
      --gradient-brand: linear-gradient(135deg, #5B2C8E 0%, #2D3561 100%);
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(91,44,142,0.12);
      --radius-card: 24px;
      --radius-btn: 12px;
      --transition: 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: #FFFFFF;
      color: var(--text-body);
      margin: 0;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 导航系统 */
    .header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid #EEECF2;
      transition: var(--transition);
    }
    .nav-link {
      position: relative;
      font-size: 15px;
      color: var(--text-body);
      letter-spacing: 0.3px;
      padding: 8px 0;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link.active {
      color: var(--primary);
      font-weight: 500;
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }
    .mobile-menu {
      display: none;
    }
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-menu {
        display: block;
      }
    }

    /* 板块标题 */
    .section-title {
      font-size: 2.25rem;
      font-weight: 600;
      color: var(--text-heading);
      margin-bottom: 16px;
      letter-spacing: -0.3px;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 48px;
      height: 4px;
      background: var(--primary);
      margin-top: 12px;
      border-radius: 2px;
    }
    .section-subtitle {
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto 48px;
      font-size: 1.1rem;
    }

    /* 按钮系统 */
    .btn-primary {
      background: var(--gradient-brand);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 500;
      letter-spacing: 0.5px;
      transition: var(--transition);
      box-shadow: 0 4px 14px rgba(91,44,142,0.3);
      border: none;
      cursor: pointer;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: 0 6px 20px rgba(91,44,142,0.45);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 500;
      letter-spacing: 0.5px;
      transition: var(--transition);
      cursor: pointer;
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: rgba(91,44,142,0.08);
      border-color: var(--primary-light);
    }

    /* 卡片通用 */
    .card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border: 1px solid var(--border-light);
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .accent-badge {
      background: rgba(212,175,55,0.1);
      color: #5B2C8E;
      font-weight: 600;
      font-size: 0.9rem;
      padding: 6px 14px;
      border-radius: 20px;
      display: inline-block;
      letter-spacing: 0.2px;
    }
    .data-number {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }

    /* 方案卡片高亮 */
    .pricing-highlight {
      border: 2px solid transparent;
      background: white;
      border-image: var(--gradient-brand) 1;
      border-radius: var(--radius-card);
      box-shadow: 0 12px 28px rgba(91,44,142,0.18);
      transform: translateY(-8px);
    }

    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 500;
      font-size: 1.1rem;
      color: var(--text-heading);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      color: #5a5a6a;
      padding-left: 16px;
      border-left: 3px solid transparent;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 16px;
      border-left-color: var(--primary);
      background: #FAFAFF;
      margin-top: 8px;
      border-radius: 0 8px 8px 0;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 表单 */
    .input-field {
      background: rgba(255,255,255,0.15);
      border: 1px solid rgba(255,255,255,0.25);
      border-radius: 10px;
      padding: 14px 18px;
      color: white;
      width: 100%;
      transition: 0.2s;
      outline: none;
    }
    .input-field:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(212,175,55,0.2);
    }
    .input-field::placeholder {
      color: rgba(255,255,255,0.6);
    }