/* roulang page: index */
:root {
      --primary-deep: #1A1A2E;
      --soft-bamboo: #E8F0E3;
      --accent-green: #00A86B;
      --accent-green-hover: #008F5A;
      --text-dark: #1F2329;
      --text-muted: #6B7280;
      --bg-light: #F5F6FA;
      --card-white: #FFFFFF;
      --border-light: #E5E7EB;
      --success-green: #00B578;
      --warning-orange: #FF9F0A;
      --error-red: #FA5151;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
      --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --max-width: 1200px;
    }

    * {
      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: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

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

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-light);
      height: 64px;
      z-index: 100;
      transition: box-shadow 0.2s ease;
    }

    .header-shadow {
      box-shadow: 0 1px 8px rgba(0,0,0,0.06);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--accent-green);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background-color: var(--accent-green);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: bold;
      font-size: 18px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }

    .nav-links a {
      font-size: 16px;
      color: var(--text-dark);
      font-weight: 500;
      transition: color 0.2s;
    }

    .nav-links a:hover {
      color: var(--accent-green);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      padding: 8px;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--text-dark);
      border-radius: 2px;
      transition: 0.2s;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      background: white;
      flex-direction: column;
      padding: 24px;
      gap: 24px;
      box-shadow: var(--shadow-md);
      z-index: 99;
    }

    .mobile-menu.active {
      display: flex;
    }

    /* Hero */
    .hero {
      padding: 120px 0 80px;
      background-color: var(--bg-light);
      display: flex;
      align-items: center;
      min-height: 80vh;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      color: var(--primary-deep);
      margin-bottom: 20px;
    }

    .hero-content p {
      font-size: 16px;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 90%;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent-green);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: background 0.2s;
      display: inline-block;
      text-align: center;
    }

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

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--accent-green);
      color: var(--accent-green);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: background 0.2s;
    }

    .btn-secondary:hover {
      background: rgba(0,168,107,0.1);
    }

    .hero-image {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-card);
      height: 400px;
      position: relative;
      overflow: hidden;
    }

    .hero-image::after {
      content: "";
      position: absolute;
      inset: 0;
      background: rgba(26,26,46,0.2);
      border-radius: var(--radius-card);
    }

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

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

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

    /* 痛点 */
    .pain-grid {
      display: flex;
      flex-direction: column;
      gap: 48px;
    }

    .pain-item {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .pain-text h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
      color: var(--primary-deep);
    }

    .pain-text p {
      color: var(--text-muted);
    }

    .pain-img {
      background-color: #E8F0E3;
      border-radius: var(--radius-card);
      height: 240px;
      background-size: cover;
      background-position: center;
    }

    /* 解决方案卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .solution-card {
      background: var(--card-white);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s, box-shadow 0.2s;
    }

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

    .card-icon {
      font-size: 36px;
      color: var(--accent-green);
      margin-bottom: 20px;
    }

    .solution-card h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    /* 数据 */
    .results {
      background-color: var(--soft-bamboo);
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }

    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-green);
      line-height: 1.2;
    }

    .stat-label {
      font-size: 14px;
      color: var(--primary-deep);
      margin-top: 8px;
    }

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 24px;
    }

    .step {
      text-align: center;
      flex: 1;
    }

    .step-circle {
      width: 48px;
      height: 48px;
      background: var(--accent-green);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 20px;
      margin: 0 auto 16px;
    }

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

    .testimonial-card {
      background: white;
      padding: 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      display: flex;
      gap: 16px;
    }

    .avatar {
      width: 56px;
      height: 56px;
      background: #E8F0E3;
      border-radius: 50%;
      flex-shrink: 0;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-muted);
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-dark {
      background: var(--primary-deep);
      padding: 80px 0;
      text-align: center;
    }

    .cta-dark h2 {
      color: white;
      font-size: 28px;
      margin-bottom: 16px;
    }

    .cta-dark p {
      color: #D1D5DB;
      margin-bottom: 32px;
    }

    /* 页脚 */
    .footer {
      background: #1F2329;
      color: white;
      padding: 48px 0 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    .footer a {
      color: #D1D5DB;
    }

    .copyright {
      margin-top: 40px;
      padding-top: 20px;
      border-top: 1px solid #374151;
      font-size: 14px;
      color: #9CA3AF;
      text-align: center;
    }

    @media (max-width: 1024px) {
      .hero-grid, .pain-item, .cards-grid, .stats-grid, .testimonial-grid, .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .process-steps {
        flex-wrap: wrap;
      }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-grid, .pain-item, .cards-grid, .stats-grid, .testimonial-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero {
        padding: 100px 0 60px;
      }
      h1 { font-size: 28px; }
      h2 { font-size: 22px; }
      .btn-group { flex-direction: column; }
    }