/* roulang page: index */
:root {
      --primary: #3564FF;
      --primary-light: rgba(53,100,255,0.08);
      --secondary: #00C2BA;
      --success: #00B578;
      --warning: #FF9F0A;
      --danger: #FA5151;
      --bg: #F5F6FA;
      --card-bg: #FFFFFF;
      --dark-bg: #1A1F36;
      --text-primary: #1F2329;
      --text-secondary: #86909C;
      --border: #E5E8EF;
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-badge: 20px;
      --shadow-card: 0 2px 8px rgba(0,0,0,0.04), 0 8px 24px rgba(0,0,0,0.06);
      --shadow-hover: 0 4px 16px rgba(0,0,0,0.08), 0 12px 32px rgba(0,0,0,0.1);
      --transition: 200ms ease-out;
      --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      --max-width: 1200px;
      --section-gap: 100px;
      --nav-height: 72px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-family);
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, input {
      font-family: inherit;
      outline: none;
      border: none;
      background: none;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .nav {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      height: var(--nav-height);
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(0,0,0,0.04);
      transition: box-shadow var(--transition);
    }
    .nav.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }
    .nav .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.5px;
    }
    .logo span {
      color: var(--primary);
      font-weight: 800;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      position: relative;
      padding: 8px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-cta {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      transition: all var(--transition);
      box-shadow: 0 4px 12px rgba(53,100,255,0.3);
    }
    .nav-cta:hover {
      filter: brightness(1.1);
      transform: scale(1.02);
    }
    .burger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .burger span {
      width: 24px;
      height: 2px;
      background: var(--text-primary);
      border-radius: 2px;
      transition: var(--transition);
    }
    /* Hero */
    .hero {
      background: var(--card-bg);
      padding: 80px 0;
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -1px;
      margin-bottom: 20px;
      color: var(--text-primary);
    }
    .hero-highlight {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-sub {
      font-size: 16px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: all var(--transition);
      box-shadow: 0 8px 20px rgba(53,100,255,0.25);
      display: inline-block;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(53,100,255,0.35);
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: all var(--transition);
    }
    .btn-secondary:hover {
      background: var(--primary-light);
    }
    .badge-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .badge {
      background: var(--primary-light);
      color: var(--primary);
      padding: 6px 16px;
      border-radius: var(--radius-badge);
      font-size: 14px;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .pulse-dot {
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
      display: inline-block;
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { opacity: 0.6; transform: scale(1); }
      50% { opacity: 1; transform: scale(1.3); }
      100% { opacity: 0.6; transform: scale(1); }
    }
    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      height: 400px;
      box-shadow: var(--shadow-card);
      position: relative;
    }
    /* 数据看板 */
    .dashboard {
      padding: var(--section-gap) 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      text-align: center;
      margin-bottom: 48px;
      letter-spacing: -0.5px;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 40px;
      box-shadow: var(--shadow-card);
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 32px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }
    .stat-label {
      font-size: 15px;
      color: var(--text-secondary);
      margin-top: 8px;
    }
    /* 服务矩阵 */
    .services {
      padding: var(--section-gap) 0;
    }
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .service-icon {
      width: 48px;
      height: 48px;
      margin-bottom: 20px;
      background: var(--primary-light);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 24px;
    }
    .service-card h3 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .service-card p {
      color: var(--text-secondary);
      font-size: 15px;
      margin-bottom: 24px;
      flex: 1;
    }
    .service-link {
      color: var(--primary);
      font-weight: 600;
      font-size: 15px;
      display: flex;
      align-items: center;
      gap: 4px;
      transition: gap var(--transition);
    }
    .service-link:hover {
      gap: 8px;
    }
    /* 对比 */
    .comparison {
      padding: var(--section-gap) 0;
    }
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 32px;
      align-items: center;
    }
    .compare-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
    }
    .compare-card.old {
      background: #F9FAFB;
    }
    .compare-tag {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-secondary);
      margin-bottom: 20px;
    }
    .compare-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .compare-list li {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 15px;
    }
    .icon-check {
      color: var(--success);
      font-weight: bold;
    }
    .icon-cross {
      color: var(--danger);
      font-weight: bold;
    }
    .vs-badge {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: white;
      width: 48px;
      height: 48px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 18px;
      box-shadow: 0 8px 20px rgba(53,100,255,0.25);
    }
    .highlight-badge {
      background: var(--primary-light);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 600;
      font-size: 14px;
    }
    /* FAQ */
    .faq {
      padding: var(--section-gap) 0;
    }
    .faq-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 40px;
    }
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 20px 0;
    }
    .faq-item:last-child {
      border-bottom: none;
    }
    .faq-question {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 16px;
      font-weight: 700;
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      color: var(--text-primary);
    }
    .faq-dot {
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
      transition: transform 0.3s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
      font-size: 14px;
      padding-left: 20px;
      margin-top: 0;
    }
    .faq-item.open .faq-answer {
      max-height: 120px;
      margin-top: 12px;
    }
    .faq-item.open .faq-dot {
      background: var(--secondary);
      transform: rotate(90deg);
    }
    /* CTA */
    .cta-section {
      padding: var(--section-gap) 0;
    }
    .cta-block {
      background: var(--dark-bg);
      border-radius: 24px;
      padding: 64px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .cta-title {
      font-size: 36px;
      font-weight: 700;
      color: white;
      margin-bottom: 16px;
    }
    .cta-sub {
      color: rgba(255,255,255,0.7);
      font-size: 16px;
    }
    .cta-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .cta-form input {
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: var(--radius-btn);
      padding: 14px 20px;
      color: white;
      font-size: 15px;
      transition: box-shadow 0.2s;
    }
    .cta-form input:focus {
      box-shadow: 0 0 0 3px rgba(53,100,255,0.4);
      border-color: var(--primary);
    }
    .btn-submit {
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      color: white;
      padding: 14px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 16px;
      cursor: pointer;
      transition: all var(--transition);
    }
    .btn-submit:hover {
      filter: brightness(1.1);
    }
    /* Footer */
    .footer {
      background: var(--dark-bg);
      color: rgba(255,255,255,0.6);
      padding: 40px 0;
      font-size: 14px;
      text-align: center;
    }
    .footer-links {
      display: flex;
      justify-content: center;
      gap: 32px;
      margin-bottom: 16px;
      flex-wrap: wrap;
    }
    .footer a {
      color: rgba(255,255,255,0.7);
    }
    .footer a:hover {
      color: white;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .cards-grid { grid-template-columns: repeat(2,1fr); }
      .compare-wrapper { grid-template-columns: 1fr; }
      .vs-badge { margin: 0 auto; }
      .cta-block { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      :root { --section-gap: 60px; }
      .nav-links { display: none; }
      .burger { display: flex; }
      .nav-links.mobile-open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: white;
        padding: 24px;
        box-shadow: var(--shadow-hover);
        gap: 20px;
      }
      .hero-title { font-size: 32px; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .cards-grid { grid-template-columns: 1fr; }
      .cta-block { padding: 32px; }
    }