/* roulang page: index */
:root {
      --bg-deep: #0A0E17;
      --card-bg: rgba(15, 23, 42, 0.6);
      --card-border: rgba(168, 85, 247, 0.15);
      --primary-purple: #A855F7;
      --primary-purple-glow: rgba(168, 85, 247, 0.7);
      --accent-cyan: #22D3EE;
      --text-white: #FFFFFF;
      --text-gray: #CBD5E1;
      --text-muted: #64748B;
      --radius-card: 16px;
      --radius-btn: 8px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
      --font-cn: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-en: 'Inter', sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-cn);
      background-color: var(--bg-deep);
      color: var(--text-gray);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-cn);
      color: var(--text-white);
      margin-top: 0;
    }

    h1 {
      font-size: 48px;
      line-height: 60px;
      font-weight: 700;
    }

    h2 {
      font-size: 36px;
      line-height: 48px;
      font-weight: 600;
      margin-bottom: 40px;
      text-align: center;
    }

    h3 {
      font-size: 24px;
      line-height: 32px;
      font-weight: 500;
    }

    a {
      color: var(--accent-cyan);
      text-decoration: none;
      transition: color var(--transition);
    }

    a:hover {
      color: var(--primary-purple);
    }

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

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(10, 14, 23, 0.85);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(168, 85, 247, 0.15);
      padding: 0 24px;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      height: 70px;
    }

    .logo {
      font-size: 28px;
      font-weight: 700;
      background: linear-gradient(135deg, #A855F7, #D946EF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 8px;
      font-family: var(--font-en);
    }

    .logo i {
      background: none;
      -webkit-text-fill-color: #A855F7;
      font-size: 32px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      color: var(--text-gray);
      font-weight: 500;
      font-size: 15px;
      transition: color var(--transition);
    }

    .nav-links a:hover {
      color: var(--text-white);
    }

    .nav-right {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .search-decor {
      background: rgba(168, 85, 247, 0.1);
      border: 1px solid rgba(168, 85, 247, 0.25);
      border-radius: 8px;
      padding: 8px 16px;
      color: var(--text-muted);
      font-size: 14px;
      display: flex;
      align-items: center;
      gap: 8px;
      cursor: default;
    }

    .btn-primary {
      background: linear-gradient(135deg, #A855F7, #D946EF);
      color: white;
      border: none;
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      font-size: 15px;
      transition: all var(--transition);
      cursor: pointer;
      display: inline-block;
      text-align: center;
    }

    .btn-primary:hover {
      box-shadow: 0 0 25px var(--primary-purple-glow);
      transform: scale(1.05);
      color: white;
    }

    .btn-secondary {
      background: transparent;
      border: 1px solid var(--accent-cyan);
      color: var(--accent-cyan);
      border-radius: var(--radius-btn);
      padding: 12px 28px;
      font-weight: 600;
      transition: all var(--transition);
      cursor: pointer;
      display: inline-block;
    }

    .btn-secondary:hover {
      background: rgba(34, 211, 238, 0.1);
      color: var(--accent-cyan);
    }

    .hamburger {
      display: none;
      font-size: 24px;
      color: white;
      cursor: pointer;
    }

    /* 区块间距 */
    section {
      padding: 120px 0;
    }

    /* Hero */
    #hero {
      padding-top: 160px;
      padding-bottom: 120px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
    }

    #hero::before {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: radial-gradient(circle at 30% 40%, rgba(168, 85, 247, 0.15), transparent 70%);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      position: relative;
    }

    .hero-image {
      background: rgba(15, 23, 42, 0.4);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(168, 85, 247, 0.25);
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 0 40px rgba(168, 85, 247, 0.3);
    }

    .hero-image img {
      width: 100%;
      height: auto;
      display: block;
      opacity: 0.9;
    }

    /* 卡片通用 */
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
    }

    .glass-card:hover {
      border-color: rgba(168, 85, 247, 0.5);
      box-shadow: 0 0 20px rgba(168, 85, 247, 0.3), 0 15px 30px rgba(0,0,0,0.5);
      transform: translateY(-6px);
    }

    .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      margin-top: 40px;
    }

    .feature-icon {
      font-size: 36px;
      color: var(--primary-purple);
      margin-bottom: 20px;
    }

    .scenario-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }

    .scenario-img img {
      width: 100%;
      border-radius: 20px;
      box-shadow: 0 15px 35px rgba(0,0,0,0.6);
      border: 1px solid rgba(168,85,247,0.2);
    }

    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .stat-highlight {
      font-size: 42px;
      font-weight: 700;
      color: var(--accent-cyan);
      line-height: 1.2;
    }

    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      margin-top: 40px;
    }

    .faq-item {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      border-radius: 12px;
      margin-bottom: 16px;
      padding: 0 24px;
      cursor: pointer;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 0;
      font-weight: 600;
      color: white;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-gray);
      padding-bottom: 0;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    .faq-item.active i {
      color: var(--primary-purple);
    }

    .cta-form {
      display: flex;
      gap: 16px;
      max-width: 500px;
      margin: 30px auto 0;
      flex-wrap: wrap;
      justify-content: center;
    }

    .cta-input {
      background: #0f172a;
      border: 1px solid rgba(168,85,247,0.3);
      border-radius: 8px;
      padding: 14px 20px;
      color: white;
      flex: 1;
      min-width: 220px;
    }

    .cta-input:focus {
      outline: none;
      border-color: var(--primary-purple);
      box-shadow: 0 0 15px rgba(168,85,247,0.5);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0 30px;
      border-top: 1px solid rgba(168,85,247,0.2);
    }

    .footer-links a {
      display: block;
      color: var(--text-muted);
      margin-bottom: 12px;
    }

    @media (max-width: 1024px) {
      .hero-grid, .scenario-row {
        grid-template-columns: 1fr;
      }
      .feature-grid, .cases-grid, .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 640px) {
      h1 { font-size: 32px; line-height: 40px; }
      h2 { font-size: 28px; }
      .nav-links, .search-decor { display: none; }
      .hamburger { display: block; }
      .feature-grid, .cases-grid, .pricing-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-image { margin-top: 30px; }
      section { padding: 80px 0; }
      .cta-form { flex-direction: column; align-items: center; }
    }