/* roulang page: index */
:root {
      --bg-deep: #0A0E27;
      --bg-gradient: #101630;
      --cyan: #00E5FF;
      --orange: #FF6D00;
      --card-bg: rgba(26, 31, 58, 0.6);
      --border-light: rgba(0, 229, 255, 0.15);
      --border-strong: rgba(0, 229, 255, 0.4);
      --text-light: #E0E6ED;
      --text-dim: #9BA4B5;
      --glass-blur: blur(20px);
      --radius-card: 16px;
      --radius-btn: 30px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --glow-cyan: 0 0 20px rgba(0, 229, 255, 0.5);
      --glow-orange: 0 0 30px rgba(255, 109, 0, 0.6);
      --font-number: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', '苹方', 'Inter', sans-serif;
      background: linear-gradient(135deg, var(--bg-deep) 0%, var(--bg-gradient) 100%);
      color: var(--text-light);
      line-height: 1.8;
      font-size: 16px;
      min-height: 100vh;
      overflow-x: hidden;
    }
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: 
        linear-gradient(rgba(0, 229, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 229, 255, 0.02) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
      z-index: 0;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      position: relative;
      z-index: 1;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 14, 39, 0.75);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border-bottom: 1px solid var(--border-light);
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: 2px;
      color: white;
    }
    .logo i {
      font-size: 2rem;
      color: var(--cyan);
      filter: drop-shadow(0 0 8px rgba(0,229,255,0.6));
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-dim);
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan);
      transition: width 0.3s;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--cyan);
    }
    .nav-links a:hover::after, .nav-links a.active::after {
      width: 100%;
    }
    .mobile-nav {
      display: none;
    }
    .hamburger {
      background: none;
      border: none;
      color: white;
      font-size: 1.8rem;
      display: none;
    }

    /* 板块间距 */
    section {
      padding: 100px 0;
      position: relative;
    }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 72px;
      gap: 40px;
    }
    .hero-left {
      flex: 0 0 60%;
    }
    .hero-left h1 {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: 2px;
      line-height: 1.3;
      margin-bottom: 24px;
    }
    .hero-left h1 span {
      color: var(--cyan);
      text-shadow: 0 0 15px rgba(0,229,255,0.5);
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-dim);
      margin-bottom: 40px;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--cyan);
      color: #0A0E27;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      border: none;
      box-shadow: var(--glow-cyan);
      transition: all 0.3s;
      font-size: 16px;
      letter-spacing: 1px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(255,109,0,0.7);
      background: var(--orange);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--cyan);
      color: var(--cyan);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.3s;
    }
    .btn-outline:hover {
      background: rgba(0,229,255,0.1);
      border-color: white;
    }
    .hero-right {
      flex: 0 0 40%;
      position: relative;
    }
    .hero-img {
      width: 100%;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
      border: 1px solid var(--border-light);
    }

    /* 数据网格 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      text-align: center;
      transition: 0.3s;
    }
    .stat-card:hover {
      border-color: var(--cyan);
      box-shadow: 0 0 20px rgba(0,229,255,0.2);
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 56px;
      font-weight: 800;
      color: var(--cyan);
      display: block;
    }
    .stat-desc {
      color: var(--text-dim);
      margin-top: 8px;
    }

    /* 服务瀑布流 */
    .services-title {
      margin-bottom: 48px;
      text-align: center;
    }
    .masonry {
      columns: 3;
      column-gap: 24px;
    }
    .service-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      overflow: hidden;
      transition: all 0.3s;
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: 0 20px 30px rgba(0,0,0,0.6);
      border-color: var(--cyan);
    }
    .service-card img {
      width: 100%;
      height: auto;
      display: block;
    }
    .service-content {
      padding: 20px;
    }
    .service-content h3 {
      font-size: 20px;
      margin-bottom: 8px;
    }
    .tag {
      background: rgba(0,229,255,0.15);
      color: var(--cyan);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 14px;
      display: inline-block;
      margin-top: 10px;
    }

    /* 对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .compare-card {
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      border-radius: var(--radius-card);
      padding: 40px;
      border: 1px solid var(--border-light);
    }
    .compare-card.recommend {
      border-color: var(--cyan);
      box-shadow: 0 0 20px rgba(0,229,255,0.2);
      position: relative;
    }
    .badge {
      position: absolute;
      top: -12px;
      right: 20px;
      background: var(--orange);
      color: white;
      padding: 6px 18px;
      border-radius: 20px;
      font-weight: 700;
    }
    .compare-list li {
      list-style: none;
      margin: 16px 0;
      display: flex;
      align-items: center;
      gap: 12px;
      color: var(--text-dim);
    }
    .compare-list i.fa-check {
      color: var(--cyan);
    }
    .compare-list i.fa-times {
      color: #666;
    }

    /* FAQ */
    .faq-item {
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      border: 1px solid var(--border-light);
      border-radius: 12px;
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-question {
      padding: 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      border-left: 4px solid var(--cyan);
    }
    .faq-answer {
      padding: 0 24px 24px;
      color: var(--text-dim);
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-section {
      background: radial-gradient(circle at 30% 30%, #1a1f3a, #0a0e27);
      text-align: center;
      border-radius: 24px;
      margin: 40px 0;
      padding: 80px 20px;
      position: relative;
    }
    .cta-btn {
      background: var(--cyan);
      border: none;
      padding: 18px 48px;
      font-size: 18px;
      font-weight: 700;
      border-radius: 40px;
      box-shadow: 0 0 25px rgba(0,229,255,0.6);
      transition: 0.3s;
      margin-top: 30px;
    }
    .cta-btn:hover {
      background: var(--orange);
      box-shadow: 0 0 40px rgba(255,109,0,0.8);
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 60px 0;
    }
    .copyright {
      border-top: 1px solid var(--border-light);
      padding: 24px 0;
      text-align: center;
      color: var(--text-dim);
    }

    @media (max-width: 1024px) {
      .hero {
        flex-direction: column;
        text-align: center;
      }
      .hero-left, .hero-right {
        flex: auto;
      }
      .masonry {
        columns: 2;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-nav {
        display: none;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: rgba(10,14,39,0.9);
        backdrop-filter: blur(20px);
        border-top: 1px solid var(--border-light);
        justify-content: space-around;
        padding: 12px 0;
        z-index: 999;
      }
      .mobile-nav a {
        color: var(--text-dim);
        font-size: 14px;
        display: flex;
        flex-direction: column;
        align-items: center;
      }
      .mobile-nav a.active {
        color: var(--cyan);
      }
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
      .compare-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 520px) {
      .masonry {
        columns: 1;
      }
      .stats-grid {
        grid-template-columns: 1fr;
      }
    }