/* roulang page: index */
:root {
      --primary-deep: #0A0E27;
      --accent-cyan: #00F0FF;
      --accent-pink: #FF3CAC;
      --text-dark: #1A1A1A;
      --text-secondary: #6B7280;
      --bg-light: #F8F9FA;
      --white: #FFFFFF;
      --border-light: #E5E7EB;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
      --font-mono: 'SF Mono', 'Menlo', 'Consolas', monospace;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --transition-smooth: 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      color: var(--text-dark);
      background-color: var(--white);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(8px);
      z-index: 100;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(0,0,0,0.04);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      color: var(--primary-deep);
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: conic-gradient(from 90deg at 50% 50%, var(--accent-cyan), var(--accent-pink), var(--accent-cyan));
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: bold;
      font-size: 18px;
      position: relative;
    }
    .logo-text {
      font-weight: 700;
      font-size: 20px;
      letter-spacing: 0.5px;
      color: var(--primary-deep);
    }
    .nav-links {
      display: flex;
      gap: 40px;
      list-style: none;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--text-dark);
      font-size: 15px;
      font-weight: 500;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--accent-cyan);
    }
    .nav-cta {
      background: var(--accent-cyan);
      color: var(--primary-deep);
      padding: 10px 24px;
      border-radius: 50px;
      font-weight: 600;
      font-size: 15px;
      text-decoration: none;
      transition: background 0.2s, transform 0.2s;
      display: inline-block;
    }
    .nav-cta:hover {
      background: #00D4E0;
      transform: scale(1.02);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary-deep);
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: var(--primary-deep);
      z-index: 200;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 48px;
    }
    .mobile-menu.active {
      display: flex;
    }
    .mobile-menu a {
      color: white;
      font-size: 24px;
      text-decoration: none;
      font-weight: 500;
    }
    .mobile-close {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 32px;
      background: transparent;
      border: none;
      color: white;
      cursor: pointer;
    }
    /* 区块通用 */
    section {
      padding: 120px 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 600;
      letter-spacing: 0.04em;
      margin-bottom: 48px;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding-top: 72px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: 0.02em;
      color: var(--primary-deep);
      margin-bottom: 24px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 40px;
      max-width: 80%;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-cyan);
      color: var(--primary-deep);
      padding: 14px 32px;
      border-radius: 50px;
      font-weight: 600;
      text-decoration: none;
      transition: background 0.2s, transform 0.2s;
      display: inline-block;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #00D4E0;
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-cyan);
      color: var(--accent-cyan);
      padding: 14px 32px;
      border-radius: 50px;
      font-weight: 600;
      text-decoration: none;
      transition: 0.2s;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
    }
    .hero-visual {
      background: rgba(10,14,39,0.05);
      border-radius: 24px;
      height: 360px;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
    }
    /* 数据看板 */
    .dashboard {
      background: var(--primary-deep);
      color: white;
    }
    .dashboard .section-title {
      color: white;
      text-align: left;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      margin-bottom: 48px;
    }
    .metric-card {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 8px;
      padding: 32px;
    }
    .metric-number {
      font-family: var(--font-mono);
      font-size: 40px;
      font-weight: 700;
      color: var(--accent-cyan);
    }
    .metric-label {
      color: #9CA3AF;
      font-size: 14px;
      margin-top: 8px;
    }
    .trend {
      display: inline-block;
      margin-left: 8px;
      color: var(--accent-pink);
    }
    .scrolling-bar {
      overflow: hidden;
      background: rgba(255,255,255,0.05);
      border-radius: 8px;
      padding: 16px;
      white-space: nowrap;
      font-family: var(--font-mono);
      color: #ccc;
    }
    .scrolling-content {
      display: inline-block;
      animation: scrollLeft 25s linear infinite;
    }
    .scrolling-bar:hover .scrolling-content {
      animation-play-state: paused;
    }
    @keyframes scrollLeft {
      0% { transform: translateX(0); }
      100% { transform: translateX(-50%); }
    }
    /* 服务矩阵 */
    .services-bg {
      background: var(--bg-light);
    }
    .service-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 32px;
    }
    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      font-size: 36px;
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .service-card p {
      color: var(--text-secondary);
      margin-bottom: 20px;
    }
    .text-link {
      color: var(--accent-cyan);
      text-decoration: none;
      border-bottom: 1px dashed var(--accent-cyan);
      font-weight: 500;
    }
    /* 对比区 */
    .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: start;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
    }
    .compare-table th, .compare-table td {
      padding: 20px 0;
      text-align: left;
      border-bottom: 1px solid var(--border-light);
    }
    .compare-table th {
      font-weight: 600;
      color: var(--text-dark);
    }
    .old-value {
      color: var(--text-secondary);
    }
    .new-value {
      color: var(--accent-cyan);
      font-weight: 600;
    }
    .chart-placeholder {
      background: #f0f0f0;
      border-radius: 16px;
      height: 280px;
      background-image: url('/assets/images/coverpic/cover-1.webp');
      background-size: cover;
      display: flex;
      align-items: flex-end;
      justify-content: center;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 24px 0;
    }
    .faq-question {
      display: flex;
      align-items: center;
      gap: 16px;
      cursor: pointer;
      font-weight: 500;
      font-size: 18px;
    }
    .q-badge {
      background: var(--accent-cyan);
      color: var(--primary-deep);
      width: 24px;
      height: 24px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 14px;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: #4B5563;
      padding-left: 40px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 16px;
    }
    /* 表单区 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 80px;
      background: var(--bg-light);
    }
    .input-group {
      margin-bottom: 24px;
    }
    .input-group label {
      font-size: 14px;
      font-weight: 500;
      color: #374151;
    }
    .input-group input, .input-group textarea {
      width: 100%;
      border: none;
      border-bottom: 1px solid #D1D5DB;
      padding: 12px 0;
      font-size: 16px;
      background: transparent;
      outline: none;
      transition: border 0.2s;
    }
    .input-group input:focus, .input-group textarea:focus {
      border-bottom: 2px solid var(--accent-cyan);
    }
    .submit-btn {
      background: var(--accent-cyan);
      color: var(--primary-deep);
      width: 100%;
      padding: 14px;
      border: none;
      border-radius: 8px;
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: 0.2s;
    }
    .submit-btn:hover {
      background: #00D4E0;
      transform: scale(1.01);
    }
    .trust-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
    }
    /* 页脚 */
    .footer {
      background: var(--primary-deep);
      color: #9CA3AF;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
    }
    .footer a {
      color: #6B7280;
      text-decoration: none;
    }
    .footer a:hover {
      color: var(--accent-cyan);
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 12px;
    }
    @media (max-width: 1024px) {
      .hero-grid, .service-grid, .comparison-grid, .contact-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .nav-links { display: none; }
      .hamburger { display: flex; }
    }
    @media (max-width: 768px) {
      section { padding: 64px 0; }
      .metrics-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; text-align: center; }
      .hero h1 { font-size: 32px; }
    }