/* roulang page: index */
:root {
      --bg-deep: #0A0E27;
      --bg-card: rgba(15, 20, 45, 0.7);
      --bg-darker: #060A1A;
      --primary-cyan: #00F0FF;
      --accent-pink: #FF3CAC;
      --text-primary: #F0F4FF;
      --text-secondary: #B0C0E0;
      --text-muted: #6A7A9A;
      --border-dim: rgba(0, 240, 255, 0.15);
      --border-glow: rgba(0, 240, 255, 0.4);
      --glass-bg: rgba(255, 255, 255, 0.03);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.5);
      --shadow-card: 0 8px 32px rgba(0, 240, 255, 0.08);
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, 'Segoe UI', sans-serif;
      --container-max: 1280px;
      --section-gap: 100px;
    }

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

    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;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    button, input, textarea {
      font-family: inherit;
      font-size: inherit;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航栏 PC */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(10, 14, 39, 0.7);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-dim);
      z-index: 1000;
      transition: background 0.3s ease;
      display: flex;
      align-items: center;
    }

    .navbar.scrolled {
      background: rgba(10, 14, 39, 0.9);
    }

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

    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--text-primary);
      display: flex;
      align-items: baseline;
      gap: 4px;
      position: relative;
    }
    .logo span {
      color: var(--primary-cyan);
      text-decoration: underline;
      text-decoration-color: var(--primary-cyan);
      text-underline-offset: 4px;
      text-decoration-thickness: 2px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-secondary);
      transition: color 0.2s, border-bottom 0.2s;
      border-bottom: 2px solid transparent;
      padding-bottom: 4px;
    }

    .nav-links a.active, .nav-links a:hover {
      color: var(--primary-cyan);
      border-bottom-color: var(--primary-cyan);
    }

    .btn-primary {
      background: var(--primary-cyan);
      color: var(--bg-deep);
      font-weight: 600;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-glow);
      transition: all 0.25s ease;
      cursor: pointer;
      letter-spacing: -0.01em;
    }

    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0, 240, 255, 0.8);
      transform: scale(1.03);
      background: #1affff;
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary-cyan);
      color: var(--primary-cyan);
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: all 0.25s ease;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
      border-color: var(--border-glow);
    }

    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 14, 39, 0.95);
      backdrop-filter: blur(25px);
      border-top: 1px solid var(--border-dim);
      z-index: 1000;
      justify-content: space-around;
      align-items: center;
      padding: 0 12px;
    }
    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      color: var(--text-muted);
      gap: 4px;
    }
    .mobile-nav a.active {
      color: var(--primary-cyan);
    }
    .mobile-nav .center-btn {
      background: var(--primary-cyan);
      color: #0A0E27;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-top: -20px;
      box-shadow: var(--shadow-glow);
    }

    /* 板块通用 */
    section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      margin-bottom: 12px;
      color: var(--text-primary);
    }
    .section-sub {
      font-size: 0.9rem;
      color: var(--primary-cyan);
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-bottom: 40px;
    }

    /* Hero */
    .hero {
      padding-top: 120px;
      padding-bottom: 80px;
      background-color: var(--bg-deep);
      background-image: radial-gradient(circle at 20% 30%, rgba(0,240,255,0.05) 0%, transparent 40%);
      position: relative;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 0 0 55%;
    }
    .hero-right {
      flex: 0 0 45%;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 1.1rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 500px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      margin-bottom: 24px;
      flex-wrap: wrap;
    }
    .live-badge {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 0.85rem;
      color: var(--primary-cyan);
      background: rgba(0,240,255,0.08);
      padding: 8px 16px;
      border-radius: 30px;
      width: fit-content;
      border: 1px solid var(--border-dim);
    }
    .pulse {
      width: 10px;
      height: 10px;
      background: var(--primary-cyan);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--primary-cyan);
      animation: pulse 1.5s infinite;
    }
    @keyframes pulse { 0% { opacity: 1; } 50% { opacity: 0.4; } 100% { opacity: 1; } }
    .dashboard-mock {
      background: rgba(255,255,255,0.02);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-lg);
      backdrop-filter: blur(10px);
      padding: 20px;
    }

    /* 数据条 */
    .stats-strip {
      background: rgba(10,14,39,0.8);
      backdrop-filter: blur(15px);
      border-top: 1px solid var(--border-dim);
      border-bottom: 1px solid var(--border-dim);
    }
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 20px;
    }
    .stat-item h3 {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--primary-cyan);
      text-shadow: 0 0 12px rgba(0,240,255,0.6);
    }

    /* 服务网格 非对称 */
    .services-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }
    .service-card {
      background: var(--glass-bg);
      border: 1px solid var(--border-dim);
      backdrop-filter: blur(20px);
      border-radius: var(--radius-lg);
      padding: 28px;
      transition: all 0.3s ease;
      position: relative;
    }
    .service-card:hover {
      border-color: var(--border-glow);
      box-shadow: var(--shadow-card);
    }
    .service-card.large {
      grid-row: span 1;
    }
    .card-icon {
      font-size: 2rem;
      margin-bottom: 16px;
    }

    /* 对比 */
    .compare-container {
      display: flex;
      gap: 0;
      background: #060A1A;
      border-radius: var(--radius-lg);
      overflow: hidden;
    }
    .compare-panel {
      flex: 1;
      padding: 32px;
    }
    .vs-divider {
      width: 2px;
      background: linear-gradient(to bottom, transparent, var(--primary-cyan), transparent);
    }

    /* 案例瀑布 */
    .masonry {
      columns: 3;
      column-gap: 24px;
    }
    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: var(--glass-bg);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.2s;
    }
    .case-card:hover {
      transform: translateY(-4px);
      border-color: var(--border-glow);
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-md);
      padding: 18px;
      cursor: pointer;
    }
    .faq-item.active {
      border-color: var(--primary-cyan);
      border-left: 4px solid var(--primary-cyan);
    }

    /* CTA */
    .cta-block {
      background: #060A1A;
    }
    .form-row {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    input, textarea {
      background: rgba(255,255,255,0.05);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-sm);
      padding: 12px;
      color: white;
      width: 100%;
    }
    input:focus {
      border-color: var(--primary-cyan);
      outline: none;
      box-shadow: 0 0 10px rgba(0,240,255,0.3);
    }

    footer {
      background: #040714;
      padding: 60px 0 30px;
    }

    @media (max-width: 1024px) {
      .hero-grid { flex-direction: column; }
      .masonry { columns: 2; }
    }
    @media (max-width: 768px) {
      .navbar { display: none; }
      .mobile-nav { display: flex; }
      .hero { padding-top: 60px; }
      .services-grid { grid-template-columns: 1fr; }
      .compare-container { flex-direction: column; }
      .masonry { columns: 1; }
      .faq-grid { grid-template-columns: 1fr; }
      .form-row { flex-direction: column; }
    }