/* roulang page: index */
:root {
      --primary: #3A6FF7;
      --primary-dark: #2A5FE0;
      --primary-light: rgba(58, 111, 247, 0.08);
      --accent: #FF7A2E;
      --accent-dark: #E6691F;
      --bg: #F5F6FA;
      --surface: #FFFFFF;
      --text: #1F2329;
      --text-secondary: #86909C;
      --text-on-dark: #FFFFFF;
      --success: #00B578;
      --warning: #FF9F0A;
      --error: #FA5151;
      --radius: 12px;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04), 0 0 1px rgba(0,0,0,0.06);
      --shadow-md: 0 6px 20px rgba(0,0,0,0.06), 0 2px 8px rgba(0,0,0,0.04);
      --transition: 200ms ease-out;
      --container: 1200px;
      --nav-height: 64px;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.5;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      width: 100%;
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 24px;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      border-radius: var(--radius);
      transition: all var(--transition);
      font-size: 16px;
      padding: 12px 28px;
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary);
      color: white;
    }
    .btn-primary:hover {
      background-color: var(--primary-dark);
      box-shadow: var(--shadow-md);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background-color: var(--primary-light);
      border-color: var(--primary-dark);
      color: var(--primary-dark);
    }

    .btn-accent {
      background-color: var(--accent);
      color: white;
    }
    .btn-accent:hover {
      background-color: var(--accent-dark);
      box-shadow: var(--shadow-md);
    }

    .btn-light {
      background: transparent;
      border: 1.5px solid rgba(255,255,255,0.7);
      color: white;
    }
    .btn-light:hover {
      background: rgba(255,255,255,0.15);
      border-color: white;
    }

    h1, h2, h3 {
      font-weight: 600;
    }

    h1 {
      font-size: 40px;
      line-height: 1.2;
      font-weight: 700;
    }
    h2 {
      font-size: 32px;
      line-height: 1.3;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 20px;
      line-height: 1.4;
    }

    /* 导航 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: var(--surface);
      box-shadow: 0 1px 0 rgba(0,0,0,0.04);
      z-index: 100;
      display: flex;
      align-items: center;
    }
    .nav .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      color: var(--text);
      font-weight: 500;
      font-size: 15px;
      transition: color var(--transition);
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-cta {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .menu-toggle {
      display: none;
      font-size: 24px;
      color: var(--text);
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-header h2 {
      color: var(--text);
    }
    .section-header p {
      color: var(--text-secondary);
      font-size: 18px;
      max-width: 700px;
      margin: 12px auto 0;
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background-color: var(--surface);
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-content {
      flex: 1;
    }
    .hero-content h1 {
      margin-bottom: 20px;
      color: var(--text);
    }
    .hero-content .subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-visual {
      flex: 1;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 24px;
      height: 400px;
      box-shadow: var(--shadow-md);
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pain-card {
      background: var(--surface);
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .pain-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 24px;
      margin-bottom: 20px;
    }
    .pain-card h3 {
      margin-bottom: 12px;
    }
    .pain-card p {
      color: var(--text-secondary);
      font-size: 14px;
    }

    /* 解决方案 */
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .solution-card {
      background: var(--surface);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
    }
    .solution-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .solution-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    .solution-body {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .solution-body h3 {
      margin-bottom: 10px;
    }
    .solution-body p {
      color: var(--text-secondary);
      font-size: 14px;
      margin-bottom: 20px;
    }
    .text-link {
      color: var(--primary);
      font-weight: 600;
      font-size: 15px;
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    /* 成果 */
    .results {
      background: var(--bg);
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
      line-height: 1.1;
    }
    .stat-label {
      color: var(--text-secondary);
      font-size: 16px;
      margin-top: 8px;
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: var(--surface);
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      position: relative;
    }
    .testimonial-card::before {
      content: "“";
      font-size: 64px;
      color: var(--primary-light);
      position: absolute;
      top: 16px;
      left: 24px;
      line-height: 1;
    }
    .testimonial-text {
      font-style: italic;
      margin-bottom: 24px;
      color: var(--text);
      position: relative;
      z-index: 1;
      padding-top: 20px;
    }
    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .avatar {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }
    .author-name {
      font-weight: 600;
    }
    .author-role {
      font-size: 14px;
      color: var(--text-secondary);
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--surface);
      border-radius: var(--radius);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
      transition: background var(--transition);
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }
    .faq-icon {
      font-size: 20px;
      color: var(--primary);
      transition: transform 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 24px;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 24px 20px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA */
    .cta-section {
      background: #1F2329;
      text-align: center;
      padding: 100px 0;
    }
    .cta-section h2 {
      color: white;
      margin-bottom: 16px;
    }
    .cta-section p {
      color: var(--text-secondary);
      font-size: 18px;
      margin-bottom: 32px;
    }
    .cta-buttons {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }

    /* Footer */
    .footer {
      background: var(--surface);
      padding: 40px 0;
      box-shadow: 0 -1px 0 rgba(0,0,0,0.04);
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 24px;
    }
    .footer-brand p {
      color: var(--text-secondary);
      font-size: 14px;
      margin-top: 8px;
    }
    .footer-links {
      display: flex;
      gap: 24px;
      font-size: 14px;
      color: var(--text-secondary);
    }
    .footer-links a:hover {
      color: var(--primary);
    }
    .copyright {
      margin-top: 24px;
      font-size: 14px;
      color: var(--text-secondary);
      text-align: center;
      width: 100%;
    }

    /* 响应式 */
    @media (max-width: 1024px) {
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      .hero .container { flex-direction: column; }
      .hero-visual { width: 100%; height: 300px; }
    }

    @media (max-width: 768px) {
      :root { --nav-height: 56px; }
      .container { padding: 0 16px; }
      section { padding: 80px 0; }
      .nav-links, .nav-cta .btn { display: none; }
      .menu-toggle { display: block; }
      .pain-grid, .solution-grid, .stats-grid { grid-template-columns: 1fr; }
      .testimonial-grid { grid-template-columns: 1fr; }
      .hero { padding: 120px 0 80px; }
      h1 { font-size: 32px; }
      h2 { font-size: 24px; }
      .stat-number { font-size: 36px; }
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 75%;
      max-width: 320px;
      height: 100vh;
      background: var(--surface);
      box-shadow: -4px 0 20px rgba(0,0,0,0.1);
      z-index: 200;
      transition: right 0.25s ease;
      padding: 24px;
      display: flex;
      flex-direction: column;
    }
    .mobile-menu.open { right: 0; }
    .mobile-menu a {
      padding: 16px 0;
      border-bottom: 1px solid #f0f0f0;
      font-weight: 500;
      font-size: 18px;
    }
    .mobile-close {
      align-self: flex-end;
      font-size: 28px;
      margin-bottom: 32px;
    }