/* roulang page: index */
:root {
      --primary: #1AAD19;
      --primary-deep: #0F8C12;
      --functional-green: #00B578;
      --warning-orange: #FF9F0A;
      --error-red: #FA5151;
      --text-dark: #1F2329;
      --text-muted: #86909C;
      --bg-light: #F5F6FA;
      --card-white: #FFFFFF;
      --border-light: #E5E8EC;
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-number: "DIN Alternate", "Roboto", sans-serif;
      --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.04);
      --shadow-card-hover: 0 8px 24px rgba(0, 0, 0, 0.08);
      --shadow-nav: 0 1px 8px rgba(0, 0, 0, 0.06);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-pill: 20px;
      --transition: 200ms ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 32px;
    }

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

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

    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(0, 0, 0, 0.05);
      transition: box-shadow var(--transition);
    }

    .header.scrolled {
      box-shadow: var(--shadow-nav);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
    }

    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
      letter-spacing: 0.5px;
    }

    .logo span {
      color: var(--text-dark);
      font-weight: 600;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }

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

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

    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 10px 22px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 14px;
      transition: background var(--transition);
    }

    .nav-cta:hover {
      background: var(--primary-deep);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      width: 24px;
    }

    .hamburger span {
      display: block;
      height: 2px;
      background: var(--text-dark);
      border-radius: 2px;
      transition: var(--transition);
    }

    /* 移动端导航 */
    .mobile-menu {
      display: none;
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(20px);
      flex-direction: column;
      padding: 24px 32px;
      gap: 18px;
      border-bottom: 1px solid var(--border-light);
      box-shadow: var(--shadow-nav);
      z-index: 99;
    }

    .mobile-menu a {
      font-size: 18px;
      font-weight: 500;
    }

    .mobile-menu .nav-cta {
      text-align: center;
      display: block;
      width: fit-content;
      padding: 12px 28px;
    }

    /* Hero */
    .hero {
      padding: 120px 0 80px;
      background-color: var(--bg-light);
      position: relative;
      overflow: hidden;
    }

    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-content {
      flex: 1;
    }

    .hero h1 {
      font-size: 38px;
      font-weight: 700;
      line-height: 1.3;
      color: var(--text-dark);
      margin-bottom: 16px;
    }

    .hero .subtitle {
      font-size: 17px;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 480px;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: background var(--transition);
      display: inline-block;
    }

    .btn-primary:hover {
      background: var(--primary-deep);
    }

    .btn-outline {
      border: 1px solid var(--text-dark);
      color: var(--text-dark);
      padding: 14px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: all var(--transition);
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

    .hero-image {
      flex: 1;
      position: relative;
    }

    .hero-image img {
      border-radius: 20px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.08);
      width: 100%;
      object-fit: cover;
    }

    .hero-glow {
      position: absolute;
      right: -20px;
      bottom: -20px;
      width: 280px;
      height: 280px;
      background: radial-gradient(circle, rgba(26,173,25,0.12) 0%, transparent 70%);
      border-radius: 50%;
      z-index: 0;
    }

    /* 区块通用 */
    section {
      padding: 90px 0;
    }

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

    .section-title h2 {
      font-size: 30px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 12px;
    }

    .section-title p {
      font-size: 16px;
      color: var(--text-muted);
    }

    /* 功能卡片 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: var(--card-white);
      padding: 36px 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: all 250ms ease-out;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }

    .feature-icon {
      width: 68px;
      height: 68px;
      background: rgba(26,173,25,0.08);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 24px;
      transition: background var(--transition);
    }

    .feature-card:hover .feature-icon {
      background: var(--primary);
    }

    .feature-icon svg {
      width: 32px;
      height: 32px;
      stroke: var(--primary);
      stroke-width: 1.8;
      transition: stroke var(--transition);
    }

    .feature-card:hover .feature-icon svg {
      stroke: white;
    }

    .feature-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 10px;
    }

    .feature-card p {
      font-size: 15px;
      color: var(--text-muted);
    }

    /* 场景 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .scene-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: all 250ms;
    }

    .scene-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-card-hover);
    }

    .scene-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }

    .scene-text {
      padding: 20px 22px;
    }

    .scene-text h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .scene-text p {
      font-size: 15px;
      color: var(--text-muted);
    }

    /* 案例 */
    .stats-row {
      display: flex;
      justify-content: center;
      gap: 60px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-family: var(--font-number);
      font-size: 44px;
      font-weight: 700;
      color: var(--primary);
    }

    .stat-label {
      font-size: 15px;
      color: var(--text-muted);
    }

    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .case-card {
      background: var(--card-white);
      padding: 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 20px;
      align-items: center;
      transition: 200ms;
      border-left: 3px solid transparent;
    }

    .case-card:hover {
      border-left-color: var(--primary);
      box-shadow: var(--shadow-card-hover);
    }

    .case-logo {
      width: 52px;
      height: 52px;
      background: #f0f2f5;
      border-radius: 50%;
    }

    .case-info h3 {
      font-size: 18px;
      font-weight: 600;
    }

    .case-info p {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: var(--card-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 18px 24px;
      cursor: pointer;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 17px;
    }

    .faq-icon {
      font-size: 22px;
      color: var(--primary);
      transition: transform 250ms;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
      font-size: 15px;
      margin-top: 0;
      padding-top: 0;
      border-top: 1px solid transparent;
    }

    .faq-item.open .faq-answer {
      max-height: 150px;
      margin-top: 14px;
      padding-top: 14px;
      border-top-color: var(--border-light);
    }

    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA */
    .cta-section {
      background: #F0FAF0;
    }

    .cta-content {
      text-align: center;
      max-width: 680px;
      margin: 0 auto;
    }

    .cta-content h2 {
      font-size: 30px;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .cta-content p {
      color: var(--text-muted);
      margin-bottom: 28px;
    }

    .trust-text {
      font-size: 13px;
      color: var(--text-muted);
      margin-top: 12px;
    }

    /* 页脚 */
    .footer {
      background: white;
      padding: 50px 0 30px;
      border-top: 1px solid var(--border-light);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    .footer-logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
    }

    .footer-desc {
      font-size: 14px;
      color: var(--text-muted);
      margin-top: 10px;
    }

    .footer-col h4 {
      font-weight: 600;
      margin-bottom: 16px;
    }

    .footer-col a {
      display: block;
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 10px;
    }

    .footer-col a:hover {
      color: var(--primary);
    }

    .social-icons {
      display: flex;
      gap: 14px;
      margin-top: 10px;
    }

    .social-icon {
      width: 36px;
      height: 36px;
      background: #f2f3f5;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: background var(--transition);
    }

    .social-icon:hover {
      background: var(--primary);
    }

    .copyright {
      text-align: center;
      margin-top: 40px;
      font-size: 13px;
      color: var(--text-muted);
    }

    @media (max-width: 1024px) {
      .container {
        padding: 0 24px;
      }
      .features-grid,
      .scenarios-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .hero .container {
        flex-direction: column;
      }
      .hero h1 {
        font-size: 28px;
      }
      .features-grid,
      .scenarios-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .stats-row {
        gap: 24px;
      }
    }