/* roulang page: index */
:root {
      --primary: #3D6BF6;
      --primary-hover: #2A52D4;
      --primary-light: rgba(61, 107, 246, 0.08);
      --green: #00B578;
      --orange: #FF9F0A;
      --red: #FA5151;
      --bg: #F5F6FA;
      --card: #FFFFFF;
      --text: #1F2329;
      --text-secondary: #86909C;
      --border: #E5E8EF;
      --radius-lg: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 4px 16px rgba(31, 35, 41, 0.08);
      --shadow-nav: 0 1px 0 rgba(31, 35, 41, 0.06);
      --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      --transition: 200ms ease;
    }

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

    body {
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

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

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

    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
      transition: all var(--transition);
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      box-shadow: var(--shadow-nav);
      z-index: 100;
      height: 64px;
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 20px;
      font-weight: 700;
      color: var(--text);
    }

    .logo i {
      font-size: 24px;
      color: var(--primary);
      stroke-width: 2px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-menu a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text);
      position: relative;
      padding: 4px 0;
    }

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

    .nav-menu a.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-lg);
      font-weight: 500;
      transition: all var(--transition);
      padding: 12px 28px;
      font-size: 16px;
      gap: 8px;
    }

    .btn-primary {
      background: var(--primary);
      color: #fff;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 4px 12px rgba(61, 107, 246, 0.3);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
    }

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

    .btn-sm {
      padding: 8px 20px;
      font-size: 14px;
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      width: 24px;
      height: 24px;
      justify-content: center;
      align-items: center;
    }

    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text);
      border-radius: 2px;
      transition: var(--transition);
    }

    .mobile-nav {
      display: none;
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      height: calc(100vh - 64px);
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(12px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 99;
      list-style: none;
    }

    .mobile-nav a {
      font-size: 18px;
      font-weight: 500;
      color: var(--text);
    }

    .mobile-nav a:hover {
      color: var(--primary);
    }

    /* 板块通用 */
    .section {
      padding: 80px 0;
    }

    .section-title {
      font-size: 28px;
      font-weight: 600;
      color: var(--text);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-sub {
      font-size: 16px;
      color: var(--text-secondary);
      text-align: center;
      margin-bottom: 48px;
    }

    .grid {
      display: grid;
      gap: 24px;
    }

    .grid-3 {
      grid-template-columns: repeat(3, 1fr);
    }

    .grid-2 {
      grid-template-columns: repeat(2, 1fr);
    }

    .card {
      background: var(--card);
      border-radius: var(--radius-lg);
      padding: 24px;
      transition: all 250ms ease;
    }

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

    /* Hero */
    .hero {
      padding: 120px 0 80px;
      background: var(--bg);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      color: var(--text);
      margin-bottom: 16px;
    }

    .hero-content .subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }

    .trust-badge {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      color: var(--text-secondary);
      margin-top: 16px;
    }

    .trust-badge i {
      color: var(--green);
    }

    .hero-image {
      background: var(--card);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: 0 10px 20px rgba(0,0,0,0.03);
    }

    .hero-image img {
      width: 100%;
      height: 360px;
      object-fit: cover;
    }

    /* 痛点卡片 */
    .pain-card {
      background: var(--card);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      text-align: left;
      border: none;
    }

    .pain-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      color: var(--primary);
      font-size: 24px;
    }

    .pain-card h3 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 8px;
    }

    .pain-card p {
      font-size: 14px;
      color: var(--text-secondary);
    }

    /* 方案卡片 */
    .solution-card {
      background: var(--card);
      border-radius: var(--radius-lg);
      overflow: hidden;
    }

    .solution-img {
      height: 180px;
      background: #eef1f7;
      overflow: hidden;
    }

    .solution-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .solution-body {
      padding: 24px;
    }

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

    .solution-body p {
      font-size: 14px;
      color: var(--text-secondary);
      margin-bottom: 16px;
    }

    .feature-list {
      list-style: none;
      font-size: 14px;
    }

    .feature-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 8px;
    }

    .feature-list li::before {
      content: "•";
      color: var(--primary);
      font-weight: bold;
    }

    /* 数据指标 */
    .stats-card {
      background: var(--bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      text-align: center;
      box-shadow: none;
    }

    .stats-number {
      font-size: 40px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.2;
    }

    .stats-label {
      font-size: 16px;
      color: var(--text-secondary);
      margin-top: 8px;
    }

    /* 证言 */
    .testimonial-card {
      background: var(--card);
      border-radius: var(--radius-lg);
      padding: 32px;
      position: relative;
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    }

    .testimonial-quote {
      font-size: 64px;
      color: rgba(61,107,246,0.1);
      position: absolute;
      top: 12px;
      left: 20px;
      line-height: 1;
    }

    .testimonial-text {
      font-size: 16px;
      font-style: italic;
      line-height: 1.7;
      margin-bottom: 24px;
      padding-top: 16px;
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border);
      padding-top: 20px;
    }

    .avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--bg);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      color: var(--primary);
    }

    .author-info h4 {
      font-size: 16px;
      font-weight: 600;
    }

    .author-info span {
      font-size: 14px;
      color: var(--text-secondary);
    }

    /* FAQ */
    .faq-item {
      background: var(--card);
      border-radius: var(--radius-lg);
      margin-bottom: 12px;
      padding: 0;
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 18px;
      font-weight: 500;
      cursor: pointer;
      background: none;
      width: 100%;
      text-align: left;
    }

    .faq-question i {
      font-size: 20px;
      transition: transform 300ms ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 300ms ease, padding 300ms ease;
      background: rgba(245,246,250,0.6);
      font-size: 16px;
      color: var(--text-secondary);
      padding: 0 24px;
    }

    .faq-item.open .faq-answer {
      max-height: 200px;
      padding: 16px 24px;
    }

    .faq-item.open .faq-question {
      color: var(--primary);
      font-weight: 600;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, rgba(61,107,246,0.04) 0%, rgba(61,107,246,0.08) 100%);
      text-align: center;
    }

    .cta-title {
      font-size: 28px;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--text);
    }

    .cta-sub {
      font-size: 16px;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }

    /* 页脚 */
    .footer {
      background: var(--card);
      border-top: 1px solid var(--border);
      padding: 60px 0 32px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    .footer-brand p {
      font-size: 14px;
      color: var(--text-secondary);
      margin-top: 12px;
    }

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

    .footer-links ul {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 10px;
    }

    .footer-links a {
      font-size: 14px;
      color: var(--text-secondary);
    }

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

    .social-icons {
      display: flex;
      gap: 12px;
      margin-top: 12px;
    }

    .social-icon {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: var(--bg);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-secondary);
      font-size: 18px;
    }

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

    .copyright {
      text-align: center;
      font-size: 14px;
      color: var(--text-secondary);
      margin-top: 48px;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-image {
        max-width: 500px;
        margin: 0 auto;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .container {
        padding: 0 16px;
      }
      .section {
        padding: 48px 0;
      }
      .hero {
        padding: 100px 0 48px;
      }
      .hero-content h1 {
        font-size: 28px;
      }
      .section-title {
        font-size: 22px;
      }
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .stats-card {
        padding: 24px;
      }
    }