/* roulang page: index */
:root {
      --primary: #0A6EFF;
      --primary-glow: rgba(10, 110, 255, 0.6);
      --secondary: #7C3AED;
      --bg-deep: #0B0E17;
      --bg-card: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --text-primary: #F1F5F9;
      --text-secondary: #94A3B8;
      --text-muted: #64748B;
      --radius-lg: 20px;
      --radius-md: 14px;
      --radius-sm: 10px;
      --shadow-glow: 0 8px 32px rgba(10, 110, 255, 0.12);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      --font-mono: 'JetBrains Mono', 'DIN Alternate', 'Courier New', monospace;
      --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    body {
      background: radial-gradient(circle at 20% 10%, #1a1f35 0%, #0B0E17 70%);
      font-family: var(--font-sans);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 网格背景装饰 */
    .grid-bg {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: 
        linear-gradient(rgba(10, 110, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(10, 110, 255, 0.03) 1px, transparent 1px);
      background-size: 60px 60px;
      pointer-events: none;
      z-index: 0;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(11, 14, 23, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      display: flex;
      align-items: center;
      z-index: 1000;
      transition: var(--transition);
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: 1px;
      background: linear-gradient(135deg, #0A6EFF, #A78BFA);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo i {
      background: none;
      -webkit-text-fill-color: #0A6EFF;
      font-size: 2rem;
    }

    .nav-links {
      display: flex;
      gap: 2.2rem;
      align-items: center;
    }

    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: #0A6EFF;
    }

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: #0A6EFF;
      box-shadow: 0 0 10px #0A6EFF;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }

    .hamburger span {
      width: 26px;
      height: 2px;
      background: var(--text-primary);
      transition: var(--transition);
    }

    /* 英雄区 */
    .hero {
      padding: 140px 0 80px;
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-content {
      flex: 1;
    }

    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 1.5rem;
    }

    .hero h1 span {
      color: #0A6EFF;
      text-shadow: 0 0 15px rgba(10, 110, 255, 0.5);
    }

    .hero-sub {
      font-size: 1.2rem;
      color: #CBD5E1;
      margin-bottom: 2.2rem;
      max-width: 500px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 32px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 1rem;
      text-decoration: none;
      transition: all 0.3s ease;
      cursor: pointer;
      border: none;
    }

    .btn-primary {
      background: #0A6EFF;
      color: white;
      box-shadow: 0 4px 18px rgba(10, 110, 255, 0.4);
    }

    .btn-primary:hover {
      background: #1e7bff;
      box-shadow: 0 0 28px rgba(10, 110, 255, 0.7);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid rgba(255, 255, 255, 0.25);
      color: white;
      backdrop-filter: blur(8px);
    }

    .btn-outline:hover {
      border-color: #0A6EFF;
      background: rgba(10, 110, 255, 0.08);
      box-shadow: 0 0 18px rgba(10, 110, 255, 0.25);
    }

    .hero-dashboard {
      flex: 1;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .metric-card {
      background: rgba(255, 255, 255, 0.04);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-md);
      padding: 20px;
      text-align: center;
      transition: var(--transition);
    }

    .metric-card:hover {
      border-color: rgba(10, 110, 255, 0.4);
      box-shadow: 0 8px 22px rgba(10, 110, 255, 0.2);
    }

    .metric-number {
      font-family: var(--font-mono);
      font-size: 2rem;
      font-weight: 600;
      color: white;
    }

    .metric-label {
      color: var(--text-secondary);
      font-size: 0.9rem;
      margin-top: 4px;
    }

    /* 通用板块 */
    section {
      padding: 90px 0;
      position: relative;
      z-index: 2;
    }

    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 16px;
      text-align: center;
    }

    .section-sub {
      color: var(--text-secondary);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 48px;
    }

    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 24px;
    }

    .service-card {
      background: var(--bg-card);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      transition: all 0.3s ease;
      position: relative;
    }

    .service-card:hover {
      transform: translateY(-6px);
      border-color: rgba(10, 110, 255, 0.5);
      box-shadow: 0 16px 36px rgba(10, 110, 255, 0.15);
    }

    .service-icon {
      font-size: 2.5rem;
      color: #7C3AED;
      margin-bottom: 20px;
    }

    .service-card h3 {
      font-size: 1.5rem;
      margin-bottom: 12px;
    }

    /* 数据对比 */
    .compare-wrapper {
      display: flex;
      gap: 24px;
      align-items: center;
      flex-wrap: wrap;
    }

    .compare-panel {
      flex: 1;
      background: rgba(255, 255, 255, 0.03);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-lg);
      padding: 32px;
      border: 1px solid rgba(255, 255, 255, 0.06);
    }

    .vs-divider {
      font-size: 2rem;
      font-weight: 700;
      color: #7C3AED;
    }

    /* 优势卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-item {
      text-align: center;
      padding: 32px 20px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      color: white;
      padding: 22px 0;
      font-size: 1.1rem;
      text-align: left;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 500;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }

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

    /* CTA 表单 */
    .cta-card {
      background: rgba(255, 255, 255, 0.04);
      backdrop-filter: blur(24px);
      border-radius: 28px;
      padding: 48px;
      border: 1px solid rgba(255, 255, 255, 0.1);
    }

    .form-row {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .form-input {
      flex: 1;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: 40px;
      padding: 14px 20px;
      color: white;
      outline: none;
    }

    .form-input:focus {
      border-color: #0A6EFF;
      box-shadow: 0 0 12px rgba(10, 110, 255, 0.3);
    }

    footer {
      background: rgba(0, 0, 0, 0.4);
      padding: 60px 0 30px;
    }

    @media (max-width: 768px) {
      .hamburger {
        display: flex;
      }
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(11, 14, 23, 0.95);
        flex-direction: column;
        padding: 30px;
        display: none;
      }
      .nav-links.open {
        display: flex;
      }
      .hero {
        flex-direction: column;
      }
      .features-grid {
        grid-template-columns: 1fr;
      }
    }