/* roulang page: index */
:root {
      --primary-dark: #0A0E27;
      --accent-cyan: #00F0FF;
      --accent-pink: #FF3CAC;
      --bg-deep: #02040F;
      --card-bg: rgba(17, 22, 51, 0.7);
      --panel-bg: #1A1F3A;
      --text-primary: #FFFFFF;
      --text-secondary: #B0B8D0;
      --text-muted: #6B7294;
      --border-light: rgba(0, 240, 255, 0.15);
      --border-glow: rgba(0, 240, 255, 0.4);
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-hover: 0 12px 40px rgba(0, 240, 255, 0.25);
      --radius-lg: 20px;
      --radius-btn: 30px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Inter', sans-serif;
      --font-mono: 'Rajdhani', 'Inter', sans-serif;
      --transition: all 0.25s ease;
    }

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

    body {
      background-color: var(--bg-deep);
      color: var(--text-primary);
      font-family: var(--font-sans);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1320px;
      margin: 0 auto;
      padding: 0 24px;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
    }

    h1 {
      font-size: 56px;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 42px;
      margin-bottom: 16px;
    }

    h3 {
      font-size: 22px;
      font-weight: 600;
    }

    p, li {
      font-size: 16px;
      color: var(--text-secondary);
      line-height: 1.8;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

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

    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(2, 4, 15, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-light);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1320px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 24px;
      font-weight: 700;
      color: var(--text-primary);
      letter-spacing: 1px;
    }

    .logo i {
      color: var(--accent-cyan);
      font-size: 28px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding: 4px 0;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-cyan);
      transition: width 0.3s ease;
    }

    .nav-links a:hover {
      color: var(--accent-cyan);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .menu-toggle {
      display: none;
      font-size: 24px;
      color: var(--text-primary);
      background: none;
      border: none;
      cursor: pointer;
    }

    /* 按钮系统 */
    .btn-primary {
      background: linear-gradient(135deg, #00F0FF, #0077FF);
      border: none;
      color: #0A0E27;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-size: 16px;
      cursor: pointer;
      display: inline-block;
      transition: var(--transition);
      text-align: center;
      box-shadow: 0 4px 15px rgba(0,240,255,0.3);
    }

    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: 0 0 24px rgba(0, 240, 255, 0.5);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
      font-weight: 600;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-size: 16px;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
    }

    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
      box-shadow: 0 0 18px rgba(0,240,255,0.3);
      transform: translateY(-2px);
    }

    /* Hero */
    #hero {
      padding: 140px 0 80px;
      display: flex;
      align-items: center;
      min-height: 90vh;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-left h1 {
      margin-bottom: 24px;
      background: linear-gradient(to right, #fff, #d0e0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-left .subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 40px;
      max-width: 500px;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    .hero-right {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hero-img-wrapper {
      position: relative;
      width: 100%;
      border-radius: 28px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6);
    }

    .hero-img-wrapper img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    .floating-badge {
      position: absolute;
      background: rgba(10,14,39,0.8);
      backdrop-filter: blur(12px);
      padding: 10px 18px;
      border-radius: 30px;
      border: 1px solid var(--border-light);
      font-size: 14px;
      font-weight: 600;
      color: var(--accent-cyan);
      box-shadow: var(--shadow-card);
    }

    .badge-1 { top: 10%; left: -15px; }
    .badge-2 { bottom: 20%; right: -10px; color: var(--accent-pink); }

    /* 数据带 */
    #stats {
      padding: 40px 0;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .stat-item {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 28px 16px;
      transition: var(--transition);
    }

    .stat-number {
      font-family: var(--font-mono);
      font-size: 48px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--accent-cyan), #0077FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: block;
    }

    .stat-label {
      color: var(--text-secondary);
      margin-top: 8px;
      font-size: 15px;
    }

    /* 通用板块 */
    section {
      padding: 90px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 56px;
    }

    .section-title h2 {
      margin-bottom: 12px;
    }

    .section-title p {
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto;
    }

    /* 服务网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 36px 28px;
      transition: var(--transition);
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      border-color: var(--accent-cyan);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }

    .service-icon {
      font-size: 48px;
      color: var(--accent-cyan);
      margin-bottom: 24px;
    }

    .service-card h3 {
      margin-bottom: 14px;
    }

    .service-link {
      margin-top: 20px;
      color: var(--accent-cyan);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: gap 0.3s;
    }

    .service-link:hover {
      gap: 12px;
    }

    /* 案例瀑布 */
    .cases-masonry {
      columns: 3;
      column-gap: 24px;
    }

    .case-card {
      break-inside: avoid;
      margin-bottom: 24px;
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      overflow: hidden;
      transition: var(--transition);
    }

    .case-img {
      position: relative;
    }

    .case-img img {
      width: 100%;
      display: block;
    }

    .case-tag {
      position: absolute;
      top: 16px;
      left: 16px;
      background: var(--accent-pink);
      color: white;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
    }

    .case-info {
      padding: 20px;
    }

    .case-info h4 {
      font-size: 20px;
      margin-bottom: 8px;
    }

    /* 对比表 */
    .compare-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .compare-col {
      background: var(--panel-bg);
      border-radius: var(--radius-lg);
      padding: 32px 20px;
      border: 1px solid transparent;
      text-align: center;
    }

    .compare-col.featured {
      border-color: var(--accent-cyan);
      background: rgba(0,240,255,0.05);
      box-shadow: 0 0 30px rgba(0,240,255,0.2);
    }

    .compare-col h3 {
      margin-bottom: 24px;
    }

    .compare-item {
      display: flex;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid rgba(255,255,255,0.1);
      color: var(--text-secondary);
    }

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
    }

    .step {
      text-align: center;
      flex: 1;
    }

    .step-badge {
      width: 64px;
      height: 64px;
      background: linear-gradient(135deg, var(--accent-cyan), #0077FF);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 28px;
      font-weight: 800;
      color: #0A0E27;
      margin: 0 auto 16px;
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    .faq-item {
      background: var(--card-bg);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 20px;
      cursor: pointer;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
    }

    /* CTA */
    #cta {
      background: linear-gradient(135deg, #0A0E27 0%, #1A1040 50%, #0A0E27 100%);
      text-align: center;
      padding: 100px 0;
    }

    /* 页脚 */
    #footer {
      background: #02040F;
      padding: 60px 0 20px;
      border-top: 1px solid var(--border-light);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      margin-bottom: 40px;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 42px; }
      h2 { font-size: 34px; }
      .services-grid { grid-template-columns: repeat(2,1fr); }
    }

    @media (max-width: 768px) {
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: rgba(2,4,15,0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 40px;
        gap: 24px;
        text-align: center;
      }
      .nav-links.active { display: flex; }
      .hero-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .services-grid { grid-template-columns: 1fr; }
      .cases-masonry { columns: 1; }
      .compare-table { grid-template-columns: 1fr; overflow-x: auto; }
      .process-steps { flex-direction: column; gap: 30px; }
      .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: repeat(2,1fr); }
    }