/* roulang page: index */
:root {
      --primary: #1A2332;
      --primary-deep: #0F1922;
      --accent: #00C9A7;
      --accent-hover: #00A88C;
      --bg-light: #F4F6F9;
      --card-bg: #FFFFFF;
      --card-border: #E1E6EC;
      --text-primary: #1A2332;
      --text-secondary: #5E6F82;
      --text-muted: #8899AA;
      --white: #FFFFFF;
      --shadow-sm: 0 4px 12px rgba(26,35,50,0.06);
      --shadow-md: 0 8px 24px rgba(26,35,50,0.10);
      --radius-sm: 10px;
      --radius-md: 16px;
      --radius-lg: 20px;
      --transition: 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
      --container-max: 1200px;
      --section-gap: 100px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .header {
      background: var(--white);
      border-bottom: 1px solid var(--card-border);
      position: sticky;
      top: 0;
      z-index: 50;
      backdrop-filter: blur(8px);
      background: rgba(255,255,255,0.92);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.3px;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--accent);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 18px;
    }

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

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

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

    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 0 24px;
      height: 44px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background var(--transition), transform 0.15s;
      white-space: nowrap;
    }

    .btn-primary:hover {
      background: var(--accent-hover);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent);
      color: var(--accent);
      padding: 0 24px;
      height: 44px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 15px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background var(--transition), color var(--transition);
    }

    .btn-outline:hover {
      background: rgba(0,201,167,0.08);
    }

    .mobile-nav {
      display: none;
    }

    /* Hero */
    .hero {
      background: linear-gradient(160deg, var(--primary) 0%, #0F1922 100%);
      padding: 80px 0 100px;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image: repeating-linear-gradient(0deg, rgba(255,255,255,0.02) 0px, rgba(255,255,255,0.02) 1px, transparent 1px, transparent 30px),
                        repeating-linear-gradient(90deg, rgba(255,255,255,0.02) 0px, rgba(255,255,255,0.02) 1px, transparent 1px, transparent 30px);
      pointer-events: none;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
    }

    .hero-content {
      flex: 1;
    }

    .hero h1 {
      font-size: 42px;
      font-weight: 700;
      line-height: 1.2;
      color: white;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.7);
      margin-bottom: 32px;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .hero-stats {
      display: flex;
      gap: 32px;
      flex-wrap: wrap;
    }

    .stat-badge {
      background: rgba(0,201,167,0.15);
      border-radius: 8px;
      padding: 12px 16px;
      color: white;
    }

    .stat-number {
      font-size: 24px;
      font-weight: 700;
      color: var(--accent);
    }

    .stat-label {
      font-size: 13px;
      color: rgba(255,255,255,0.7);
    }

    .hero-image {
      flex: 1;
      background: rgba(255,255,255,0.05);
      border-radius: var(--radius-lg);
      padding: 20px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
      transform: perspective(800px) rotateY(-3deg);
    }

    .hero-image img {
      border-radius: var(--radius-md);
      width: 100%;
    }

    /* 板块通用 */
    .section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--primary);
    }

    .section-desc {
      font-size: 18px;
      color: var(--text-secondary);
      max-width: 700px;
      margin-bottom: 48px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: all var(--transition);
    }

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

    .icon-circle {
      width: 48px;
      height: 48px;
      background: rgba(0,201,167,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 24px;
      margin-bottom: 20px;
    }

    .card h3 {
      font-size: 22px;
      margin-bottom: 12px;
      font-weight: 700;
    }

    .card p {
      color: var(--text-secondary);
      font-size: 15px;
      line-height: 1.6;
    }

    .badge {
      background: var(--accent);
      color: white;
      padding: 4px 12px;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 600;
      display: inline-block;
      margin-top: 16px;
    }

    /* 功能分组 */
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 32px;
    }

    .feature-item {
      text-align: center;
      padding: 20px;
    }

    .feature-icon {
      font-size: 32px;
      color: var(--accent);
      margin-bottom: 12px;
    }

    .feature-name {
      font-weight: 600;
      font-size: 16px;
    }

    /* 场景卡片 */
    .scene-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--card-border);
      transition: var(--transition);
    }

    .scene-card:hover {
      box-shadow: var(--shadow-md);
    }

    .scene-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }

    .scene-body {
      padding: 20px;
    }

    .tag {
      background: #EDF2F7;
      color: var(--text-secondary);
      padding: 4px 10px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 500;
    }

    /* 案例 */
    .case-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 28px;
      border: 1px solid var(--card-border);
    }

    .quote {
      font-style: italic;
      color: var(--text-secondary);
      margin: 16px 0;
    }

    /* 价格 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .pricing-card {
      background: var(--white);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-md);
      padding: 32px;
      text-align: center;
      position: relative;
    }

    .pricing-card.recommend {
      border: 2px solid var(--accent);
      box-shadow: var(--shadow-md);
    }

    .recommend-tag {
      background: var(--accent);
      color: white;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 13px;
      position: absolute;
      top: -12px;
      left: 50%;
      transform: translateX(-50%);
      font-weight: 600;
    }

    .price {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary);
      margin: 20px 0;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--card-border);
      padding: 20px 0;
    }

    .faq-question {
      font-weight: 700;
      font-size: 18px;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F8FAFC;
      border-radius: 8px;
      margin-top: 8px;
      padding: 0 16px;
      color: var(--text-secondary);
    }

    .faq-answer.open {
      max-height: 200px;
      padding: 16px;
    }

    .cta-banner {
      background: linear-gradient(160deg, var(--primary), #0F1922);
      border-radius: var(--radius-lg);
      padding: 64px;
      text-align: center;
      color: white;
    }

    .footer {
      background: var(--primary);
      color: rgba(255,255,255,0.7);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 40px;
    }

    .footer a {
      color: rgba(255,255,255,0.6);
      font-size: 14px;
      display: block;
      margin: 8px 0;
      transition: color 0.2s;
    }

    .footer a:hover {
      color: var(--accent);
    }

    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      .feature-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }

    @media (max-width: 768px) {
      .header {
        display: none;
      }
      .mobile-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: white;
        border-top: 1px solid var(--card-border);
        justify-content: space-around;
        padding: 12px 8px;
        z-index: 100;
        backdrop-filter: blur(10px);
      }
      .mobile-nav a {
        font-size: 12px;
        color: var(--text-secondary);
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 4px;
      }
      .grid-3, .pricing-grid {
        grid-template-columns: 1fr;
      }
      .hero h1 {
        font-size: 28px;
      }
      .section {
        padding: 64px 0;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .feature-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }