/* roulang page: index */
:root {
      --primary-cyan: #00F0FF;
      --accent-magenta: #FF3A6F;
      --bg-deep: #0A0E1A;
      --bg-card: rgba(15, 25, 45, 0.7);
      --glass-border: rgba(0, 240, 255, 0.15);
      --text-soft: #E2E8F0;
      --text-muted: #94A3B8;
      --text-body: #CBD5E1;
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-dock: 40px;
      --shadow-glow: 0 0 20px rgba(0,240,255,0.4);
      --shadow-magenta: 0 0 20px rgba(255,58,111,0.5);
      --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      background-color: var(--bg-deep);
      color: var(--text-body);
      font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      background-image: 
        linear-gradient(rgba(0,240,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,240,255,0.03) 1px, transparent 1px);
      background-size: 40px 40px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-smooth);
    }
    button, input, textarea {
      font-family: inherit;
      outline: none;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    /* 浮动导航 Dock */
    .nav-dock {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 90vw;
      background: rgba(10, 14, 26, 0.8);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(0, 240, 255, 0.2);
      border-radius: var(--radius-dock);
      padding: 12px 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 32px;
      z-index: 1000;
      box-shadow: 0 10px 25px -10px rgba(0,0,0,0.5);
    }
    .logo {
      font-weight: 700;
      font-size: 24px;
      letter-spacing: -0.5px;
      color: white;
      display: flex;
      align-items: center;
      gap: 6px;
      white-space: nowrap;
    }
    .logo-icon {
      color: var(--primary-cyan);
      font-size: 28px;
      filter: drop-shadow(0 0 8px var(--primary-cyan));
    }
    .nav-links {
      display: flex;
      gap: 24px;
      align-items: center;
      flex-wrap: wrap;
    }
    .nav-links a {
      color: var(--text-muted);
      font-weight: 500;
      font-size: 15px;
      transition: color var(--transition-smooth);
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--primary-cyan);
    }
    .nav-cta {
      background: linear-gradient(135deg, var(--accent-magenta), #FF6B8A);
      padding: 10px 22px;
      border-radius: 30px;
      color: white;
      font-weight: 600;
      font-size: 15px;
      box-shadow: 0 4px 15px rgba(255,58,111,0.4);
      transition: all var(--transition-smooth);
      border: none;
      white-space: nowrap;
      cursor: pointer;
    }
    .nav-cta:hover {
      box-shadow: 0 6px 22px rgba(255,58,111,0.7);
      transform: scale(1.02);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: var(--transition-smooth);
    }
    /* Hero */
    .hero {
      min-height: 90vh;
      display: grid;
      grid-template-columns: 1fr 1fr;
      align-items: center;
      padding-top: 80px;
      gap: 40px;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -1.5px;
      line-height: 1.2;
      background: linear-gradient(135deg, var(--primary-cyan) 0%, #ffffff 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 36px;
      max-width: 480px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary-cyan);
      color: #0A0E1A;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      border: none;
      box-shadow: var(--shadow-glow);
      transition: all var(--transition-smooth);
      cursor: pointer;
      font-size: 16px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(0,240,255,0.6);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.25);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      backdrop-filter: blur(8px);
      transition: all var(--transition-smooth);
      cursor: pointer;
    }
    .btn-secondary:hover {
      border-color: var(--primary-cyan);
      background: rgba(0,240,255,0.08);
    }
    .hero-visual {
      background: rgba(15,25,45,0.5);
      backdrop-filter: blur(12px);
      border: 1px solid var(--glass-border);
      border-radius: 24px;
      padding: 20px;
      box-shadow: 0 0 35px rgba(0,240,255,0.15);
    }
    .hero-visual img {
      border-radius: 16px;
      width: 100%;
      height: auto;
    }
    /* 通用板块 */
    .section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--text-soft);
      margin-bottom: 20px;
      text-align: center;
    }
    .section-desc {
      color: var(--text-muted);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 50px;
    }
    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 24px;
    }
    .metric-card {
      background: var(--bg-card);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(0,240,255,0.1);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      text-align: center;
      transition: var(--transition-smooth);
    }
    .metric-value {
      font-family: var(--font-mono);
      font-size: 36px;
      font-weight: 700;
      color: var(--primary-cyan);
      margin-bottom: 8px;
    }
    .metric-label {
      color: var(--text-muted);
      font-size: 14px;
      text-transform: uppercase;
      letter-spacing: 1px;
    }
    .progress-bar {
      height: 4px;
      background: rgba(255,255,255,0.08);
      border-radius: 4px;
      margin-top: 16px;
      overflow: hidden;
    }
    .progress-fill {
      width: 70%;
      height: 100%;
      background: var(--primary-cyan);
      border-radius: 4px;
    }
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--bg-card);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: all var(--transition-smooth);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .service-card:hover {
      border-color: var(--primary-cyan);
      box-shadow: 0 0 30px rgba(0,240,255,0.25);
      transform: translateY(-6px);
    }
    .service-icon {
      font-size: 32px;
      color: var(--primary-cyan);
    }
    .service-title {
      font-size: 20px;
      font-weight: 600;
      color: var(--text-soft);
    }
    .service-desc {
      color: var(--text-muted);
      font-size: 15px;
    }
    .service-link {
      color: var(--primary-cyan);
      font-weight: 600;
      margin-top: auto;
    }
    /* 对比表 */
    .comparison-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .compare-col {
      background: rgba(15,25,45,0.5);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: var(--radius-card);
      padding: 32px;
    }
    .compare-col.highlight {
      border: 2px solid var(--primary-cyan);
      box-shadow: 0 0 25px rgba(0,240,255,0.3);
      background: rgba(0,240,255,0.05);
    }
    .compare-header {
      font-size: 22px;
      font-weight: 700;
      color: white;
      margin-bottom: 24px;
    }
    .compare-item {
      display: flex;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.06);
      padding: 16px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: var(--text-soft);
      cursor: pointer;
      padding: 10px 0;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
      padding-left: 20px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }
    /* 表单 */
    .contact-card {
      background: rgba(10,14,26,0.7);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: 24px;
      padding: 48px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .input-field {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 10px;
      padding: 14px;
      width: 100%;
      color: white;
      margin-bottom: 16px;
      transition: var(--transition-smooth);
    }
    .input-field:focus {
      border-color: var(--primary-cyan);
      box-shadow: 0 0 10px rgba(0,240,255,0.2);
    }
    .submit-btn {
      background: linear-gradient(135deg, var(--accent-magenta), #FF6B8A);
      border: none;
      padding: 14px 28px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      color: white;
      width: 100%;
      cursor: pointer;
      box-shadow: 0 4px 18px rgba(255,58,111,0.4);
      transition: var(--transition-smooth);
    }
    .submit-btn:hover {
      box-shadow: 0 8px 28px rgba(255,58,111,0.7);
    }
    /* 页脚 */
    .footer {
      background: #070A14;
      padding: 60px 0 30px;
      text-align: center;
      border-top: 1px solid rgba(0,240,255,0.15);
    }
    .footer-links {
      display: flex;
      gap: 24px;
      justify-content: center;
      margin: 20px 0;
      flex-wrap: wrap;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .hero {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-sub {
        max-width: 100%;
      }
      .metrics-grid {
        grid-template-columns: repeat(3, 1fr);
      }
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        background: rgba(10,14,26,0.95);
        width: 100%;
        padding: 20px;
        border-radius: 24px;
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .services-grid, .comparison-grid {
        grid-template-columns: 1fr;
      }
      .contact-card {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 36px;
      }
    }