/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --primary: #2D5CF6;
      --primary-hover: #1A3FC4;
      --secondary: #00C48C;
      --accent: #FF6B35;
      --bg-light: #F8F9FC;
      --bg-white: #FFFFFF;
      --bg-dark: #131A2D;
      --text-main: #1F2329;
      --text-secondary: #6B7280;
      --text-muted: #9CA3AF;
      --border-light: rgba(0,0,0,0.04);
      --shadow-card: 0px 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0px 8px 24px rgba(0,0,0,0.08);
      --radius-card: 16px;
      --radius-btn: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    @media (max-width: 480px) {
      .container {
        padding: 0 16px;
      }
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      font-family: var(--font-sans);
      cursor: pointer;
      border: none;
      outline: none;
      transition: all 0.2s ease;
    }
    .btn-primary {
      background-color: var(--primary);
      color: white;
      padding: 12px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      box-shadow: 0 2px 8px rgba(45,92,246,0.2);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(45,92,246,0.3);
    }
    .btn-secondary {
      background-color: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 12px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-secondary:hover {
      background-color: rgba(45,92,246,0.04);
    }
    h1, h2, h3, h4 {
      font-weight: 600;
      line-height: 1.3;
    }
    h1 {
      font-size: 48px;
      font-weight: 700;
    }
    h2 {
      font-size: 36px;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 22px;
    }
    @media (max-width: 768px) {
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 28px;
      }
      h3 {
        font-size: 20px;
      }
    }
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-title p {
      color: var(--text-secondary);
      font-size: 16px;
      max-width: 600px;
      margin: 8px auto 0;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
      transition: box-shadow 0.3s;
    }
    .navbar.scrolled {
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    }
    .navbar .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--text-main);
      font-weight: 400;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
    }
    .nav-cta {
      margin-left: 16px;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      justify-content: space-between;
      width: 24px;
      height: 20px;
      cursor: pointer;
    }
    .hamburger span {
      height: 2px;
      background: var(--text-main);
      border-radius: 2px;
      transition: 0.3s;
    }
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 32px 24px;
        gap: 24px;
        display: none;
        box-shadow: 0 12px 24px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: flex;
      }
      .nav-cta {
        margin-left: 0;
      }
    }
    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: linear-gradient(135deg, #FFFFFF 60%, #E8EDFF 100%);
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-content {
      flex: 1;
    }
    .hero-content h1 {
      margin-bottom: 16px;
      color: var(--text-main);
    }
    .hero-content .subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }
    .hero-badges {
      display: flex;
      gap: 32px;
      flex-wrap: wrap;
    }
    .badge-item {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .badge-number {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
    }
    .badge-text {
      font-size: 13px;
      color: var(--text-secondary);
    }
    .hero-image {
      flex: 1;
      background: rgba(45,92,246,0.03);
      border-radius: 32px;
      overflow: hidden;
      border: 1px solid rgba(0,0,0,0.02);
    }
    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
      border-radius: 32px;
    }
    @media (max-width: 768px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero-buttons {
        justify-content: center;
      }
      .hero-badges {
        justify-content: center;
      }
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }
    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      width: 56px;
      height: 56px;
      background: #EEF2FF;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
      font-size: 28px;
    }
    .feature-card h3 {
      margin-bottom: 10px;
    }
    .feature-card p {
      color: var(--text-secondary);
      font-size: 15px;
    }
    @media (max-width: 1024px) {
      .features-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 480px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 产品功能矩阵 非对称 */
    .matrix-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .matrix-large {
      grid-row: span 2;
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 40px;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      justify-content: center;
      background-image: url('/assets/images/coverpic/cover-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
      color: white;
    }
    .matrix-large::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(0deg, rgba(19,26,45,0.85) 0%, rgba(19,26,45,0.3) 100%);
    }
    .matrix-large-content {
      position: relative;
      z-index: 2;
    }
    .matrix-large h3 {
      font-size: 28px;
      margin-bottom: 12px;
    }
    .matrix-small {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
    }
    @media (max-width: 768px) {
      .matrix-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 场景交错 */
    .scene-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }
    .scene-row.reverse {
      flex-direction: row-reverse;
    }
    .scene-img {
      flex: 1;
      border-radius: 24px;
      overflow: hidden;
      background: #E8EDFF;
    }
    .scene-img img {
      width: 100%;
      height: 300px;
      object-fit: cover;
    }
    .scene-text {
      flex: 1;
    }
    .scene-text h3 {
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      .scene-row, .scene-row.reverse {
        flex-direction: column;
      }
    }
    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
    }
    .case-growth {
      font-size: 28px;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 8px;
    }
    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      padding: 20px 24px;
      margin-bottom: 16px;
      box-shadow: var(--shadow-card);
      cursor: pointer;
      transition: 0.2s;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
    }
    .faq-answer {
      display: none;
      margin-top: 12px;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* CTA */
    .cta-section {
      background: var(--bg-dark);
      padding: 80px 0;
      text-align: center;
      border-radius: 32px;
      margin: 80px 0;
    }
    .cta-section h2 {
      color: white;
      margin-bottom: 16px;
    }
    .cta-section p {
      color: var(--text-muted);
      margin-bottom: 32px;
    }
    /* Footer */
    .footer {
      background: #1F2329;
      color: var(--text-muted);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-logo {
      font-size: 22px;
      font-weight: 700;
      color: white;
      margin-bottom: 12px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.08);
      padding-top: 24px;
      text-align: center;
      font-size: 14px;
    }