/* roulang page: index */
:root {
      --primary: #00E5FF;
      --primary-glow: rgba(0, 229, 255, 0.6);
      --primary-soft: rgba(0, 229, 255, 0.12);
      --accent: #FFB800;
      --bg-deep: #0A0F1E;
      --bg-card: rgba(26, 42, 68, 0.45);
      --bg-card-solid: #1A2A44;
      --border-glass: rgba(0, 229, 255, 0.15);
      --text-primary: rgba(255, 255, 255, 0.92);
      --text-secondary: rgba(255, 255, 255, 0.7);
      --text-muted: rgba(255, 255, 255, 0.5);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-full: 9999px;
      --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
      --shadow-glow: 0 0 20px rgba(0,229,255,0.25);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    /* 自定义容器，配合Tailwind使用 */
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 玻璃拟态卡片基础 */
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px) saturate(120%);
      border: 1px solid var(--border-glass);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      box-shadow: var(--shadow-card), var(--shadow-glow);
      border-color: rgba(0,229,255,0.35);
      transform: translateY(-4px);
    }

    /* 发光按钮 */
    .btn-primary {
      background: var(--primary);
      color: #0A0F1E;
      font-weight: 600;
      border-radius: var(--radius-full);
      padding: 0.75rem 2rem;
      box-shadow: 0 0 18px var(--primary-glow);
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      letter-spacing: 0.3px;
      font-size: 1rem;
    }
    .btn-primary:hover {
      box-shadow: 0 0 30px var(--primary-glow);
      filter: brightness(1.15);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      border-radius: var(--radius-full);
      padding: 0.75rem 2rem;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 1rem;
      backdrop-filter: blur(8px);
    }
    .btn-outline:hover {
      background: rgba(0,229,255,0.1);
      box-shadow: 0 0 18px rgba(0,229,255,0.5);
      border-color: rgba(0,229,255,0.8);
      transform: translateY(-1px);
    }

    /* 导航样式 */
    .navbar-glass {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      background: rgba(10, 15, 30, 0.35);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.2);
      height: 64px;
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }
    .navbar-scrolled {
      background: rgba(10, 15, 30, 0.92);
      box-shadow: 0 4px 20px rgba(0,0,0,0.6);
    }
    .nav-link {
      color: rgba(255,255,255,0.8);
      transition: color 0.2s;
      font-weight: 500;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-active {
      color: var(--primary);
      position: relative;
    }
    .nav-active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      box-shadow: 0 0 8px var(--primary);
      border-radius: 2px;
    }

    /* FAQ手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      transition: all 0.3s;
    }
    .faq-question {
      cursor: pointer;
      padding: 1.2rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1.2rem;
      color: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.4s ease, background 0.3s;
      color: var(--text-secondary);
      padding-left: 0;
      background: transparent;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 0 1.2rem 1rem;
      background: rgba(0,229,255,0.03);
      border-left: 2px solid var(--primary);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-icon {
      transition: transform 0.3s ease;
      color: var(--primary);
    }

    /* 动态网格背景 (Hero) */
    .hero-bg-mesh {
      background-image: 
        linear-gradient(rgba(0,229,255,0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,229,255,0.05) 1px, transparent 1px);
      background-size: 40px 40px;
      background-position: center center;
      animation: meshMove 20s linear infinite;
    }
    @keyframes meshMove {
      0% { background-position: 0 0; }
      100% { background-position: 40px 40px; }
    }

    /* 对比表格高亮 */
    .compare-highlight {
      background: rgba(0,229,255,0.08);
      border-left: 3px solid var(--primary);
    }

    @media (max-width: 1024px) {
      .container-custom {
        padding-left: 20px;
        padding-right: 20px;
      }
      .case-row {
        flex-direction: column !important;
      }
    }
    @media (max-width: 640px) {
      .container-custom {
        padding-left: 16px;
        padding-right: 16px;
      }
      h1 { font-size: 2rem !important; }
      h2 { font-size: 1.8rem !important; }
      .btn-primary, .btn-outline {
        padding: 0.7rem 1.5rem;
        font-size: 0.9rem;
      }
    }