/* roulang page: index */
:root {
      --deep-blue: #0B0E1A;
      --neon-cyan: #00F0FF;
      --warm-orange: #FF6B35;
      --white-soft: rgba(255, 255, 255, 0.9);
      --white-mid: rgba(255, 255, 255, 0.7);
      --white-dim: rgba(255, 255, 255, 0.4);
      --card-bg: rgba(255, 255, 255, 0.03);
      --card-border: rgba(255, 255, 255, 0.08);
      --glass-blur: blur(20px);
      --radius-lg: 16px;
      --radius-full: 50px;
      --shadow-glow: 0 0 30px rgba(0, 240, 255, 0.15);
      --font-sans: 'Inter', 'SF Pro Display', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--deep-blue);
      color: var(--white-mid);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--card-bg);
      backdrop-filter: var(--glass-blur);
      -webkit-backdrop-filter: var(--glass-blur);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-lg);
      transition: all 0.3s ease;
    }

    .glass-card:hover {
      border-color: rgba(0, 240, 255, 0.4);
      box-shadow: var(--shadow-glow);
      transform: translateY(-4px);
    }

    /* 发光按钮 */
    .btn-primary {
      background-color: var(--warm-orange);
      color: white;
      border: none;
      border-radius: var(--radius-full);
      padding: 0.9rem 2.2rem;
      font-weight: 600;
      font-size: 1rem;
      letter-spacing: 0.5px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      transition: all 0.3s ease;
      cursor: pointer;
      text-decoration: none;
      box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
      white-space: nowrap;
    }

    .btn-primary:hover {
      box-shadow: 0 0 25px rgba(0, 240, 255, 0.6), 0 8px 20px rgba(255, 107, 53, 0.4);
      transform: scale(1.03);
      background-color: #ff7f52;
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--neon-cyan);
      color: var(--neon-cyan);
      border-radius: var(--radius-full);
      padding: 0.8rem 2rem;
      font-weight: 500;
      transition: all 0.3s ease;
      cursor: pointer;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 0.4rem;
    }

    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
      box-shadow: 0 0 18px rgba(0, 240, 255, 0.4);
    }

    /* 导航固定 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(11, 14, 26, 0.8);
      backdrop-filter: blur(30px);
      -webkit-backdrop-filter: blur(30px);
      border-bottom: 1px solid rgba(0, 240, 255, 0.2);
      padding: 0.8rem 0;
    }

    .nav-link {
      color: var(--white-mid);
      font-weight: 500;
      transition: color 0.2s;
      text-decoration: none;
      font-size: 0.95rem;
    }

    .nav-link:hover {
      color: var(--neon-cyan);
    }

    /* 搜索框装饰 */
    .search-box {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: 40px;
      padding: 0.5rem 1.2rem;
      color: white;
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-size: 0.9rem;
      color: var(--white-dim);
      cursor: default;
    }

    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: rgba(11, 14, 26, 0.96);
      backdrop-filter: blur(30px);
      position: absolute;
      top: 100%;
      left: 0;
      width: 100%;
      padding: 1.5rem;
      border-bottom: 1px solid rgba(0, 240, 255, 0.3);
    }

    #menu-toggle:checked~.mobile-menu {
      display: flex;
    }

    /* 背景网格纹理 */
    .hero-bg-pattern {
      background-image: radial-gradient(rgba(0, 240, 255, 0.08) 1px, transparent 1px);
      background-size: 40px 40px;
    }

    /* 发光数字 */
    .stat-number {
      font-size: clamp(2.5rem, 5vw, 3.5rem);
      font-weight: 800;
      color: var(--neon-cyan);
      text-shadow: 0 0 20px rgba(0, 240, 255, 0.6);
      line-height: 1.2;
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .faq-question {
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 1.2rem 0;
      font-weight: 600;
      color: white;
      transition: color 0.2s;
    }

    .faq-question:hover {
      color: var(--neon-cyan);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--white-mid);
      padding-right: 2rem;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.2rem;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--neon-cyan);
    }

    .faq-icon {
      font-size: 1.5rem;
      transition: transform 0.3s, color 0.2s;
      color: var(--neon-cyan);
    }

    /* 证言卡片竖线 */
    .testimonial-card {
      border-left: 3px solid var(--neon-cyan);
    }

    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }

      .hamburger-menu {
        display: block;
      }

      .hero-grid {
        flex-direction: column;
      }

      .hero-image {
        height: 250px;
      }
    }

    @media (min-width: 769px) {
      .hamburger-menu {
        display: none;
      }
    }