/* roulang page: index */
:root {
      --primary: #E8451E;
      --primary-hover: #c9301a;
      --secondary: #2B2D3A;
      --gradient-start: #E8451E;
      --gradient-mid: #C72E8A;
      --gradient-end: #6B2FA0;
      --deep-bg: #1E1F2A;
      --light-bg: #F9F9FB;
      --card-bg: #FFFFFF;
      --dark-card: #1E1F2A;
      --text-main: #2B2D3A;
      --text-muted: #6B7280;
      --border-light: rgba(0,0,0,0.05);
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-card: 0 4px 24px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.1);
      --radius-card: 20px;
      --radius-btn: 50px;
      --radius-sm: 14px;
      --font-sans: 'Inter', 'PingFang SC', 'MiSans', 'Helvetica Neue', system-ui, sans-serif;
      --transition-base: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--light-bg);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-base);
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 导航 */
    .glass-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(255,255,255,0.7);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0,0,0,0.05);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }
    .glass-nav.scrolled {
      background: rgba(255,255,255,0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    }
    .nav-link {
      font-weight: 500;
      color: var(--text-main);
      padding: 8px 16px;
      border-radius: 30px;
      transition: var(--transition-base);
    }
    .nav-link:hover {
      color: var(--primary);
      background: rgba(232,69,30,0.08);
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid));
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      border: none;
      cursor: pointer;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      box-shadow: 0 4px 14px rgba(232,69,30,0.3);
      letter-spacing: 0.3px;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      transform: scale(1.03);
      box-shadow: 0 8px 22px rgba(232,69,30,0.4);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      cursor: pointer;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    /* 移动菜单 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 70px;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(20px);
      padding: 24px;
      flex-direction: column;
      gap: 16px;
      border-bottom: 1px solid var(--border-light);
      box-shadow: var(--shadow-card);
      z-index: 49;
    }
    .mobile-menu.active {
      display: flex;
    }
    /* 数据徽章动画 */
    @keyframes softPulse {
      0% { transform: scale(1); opacity: 0.9; }
      50% { transform: scale(1.03); opacity: 1; }
      100% { transform: scale(1); opacity: 0.9; }
    }
    .badge-pulse {
      animation: softPulse 3s infinite ease-in-out;
    }
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid #e5e7eb;
    }
    .faq-question {
      cursor: pointer;
      padding: 20px 0;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: color 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s ease;
      color: var(--text-muted);
      line-height: 1.6;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .faq-item.active .faq-indicator {
      background: linear-gradient(135deg, var(--gradient-start), var(--gradient-mid));
    }
    .faq-indicator {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #d1d5db;
      transition: background 0.3s;
      margin-right: 12px;
    }
    /* 渐变条 */
    .gradient-top-bar {
      height: 6px;
      width: 100%;
      background: linear-gradient(90deg, var(--gradient-start), var(--gradient-mid), var(--gradient-end));
      border-radius: 20px 20px 0 0;
    }
    @media (max-width: 768px) {
      .container {
        padding-left: 20px;
        padding-right: 20px;
      }
      h1 {
        font-size: 36px !important;
      }
      h2 {
        font-size: 28px !important;
      }
      .mobile-menu {
        display: none;
      }
    }