/* roulang page: index */
:root {
      --primary: #1B5E20;
      --primary-dark: #144018;
      --accent: #F57C00;
      --accent-dark: #E65100;
      --bg: #FAFAFA;
      --white: #FFFFFF;
      --text: #1F2329;
      --text-secondary: #86909C;
      --success: #00B578;
      --warning: #FF9F0A;
      --error: #FA5151;
      --radius-sm: 8px;
      --radius: 12px;
      --radius-lg: 16px;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow: 0 8px 32px rgba(0,0,0,0.06);
      --shadow-glow-green: 0 0 16px rgba(27,94,32,0.4);
      --shadow-glow-orange: 0 0 20px rgba(245,124,0,0.5);
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      --transition: 200ms ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background: var(--bg);
      color: var(--text);
      line-height: 1.6;
      font-size: 16px;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: var(--white);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      padding: 0 32px;
    }
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo svg {
      width: 32px;
      height: 32px;
      stroke: var(--primary);
      fill: none;
      stroke-width: 1.5px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-size: 16px;
      color: var(--text-secondary);
      transition: color var(--transition);
      font-weight: 500;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-cta {
      background: var(--accent);
      color: white;
      padding: 8px 18px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 14px;
      transition: background var(--transition), box-shadow var(--transition);
      white-space: nowrap;
    }
    .nav-cta:hover {
      background: var(--accent-dark);
      box-shadow: var(--shadow-glow-orange);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 4px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      transition: var(--transition);
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: var(--white);
      box-shadow: 0 8px 24px rgba(0,0,0,0.08);
      flex-direction: column;
      padding: 24px 32px;
      gap: 20px;
      z-index: 999;
    }
    .mobile-menu a {
      font-size: 18px;
      color: var(--text);
      font-weight: 500;
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu.active {
        display: flex;
      }
    }
    /* 区块间距 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 48px 0;
      }
    }
    /* Hero */
    .hero {
      margin-top: 72px;
      background: var(--bg);
      min-height: calc(100vh - 72px);
      display: flex;
      align-items: center;
    }
    .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 p {
      font-size: 16px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .btn-cta {
      background: var(--accent);
      color: white;
      font-weight: 700;
      font-size: 18px;
      padding: 14px 32px;
      border-radius: var(--radius);
      border: none;
      cursor: pointer;
      transition: background var(--transition), box-shadow var(--transition);
      display: inline-block;
    }
    .btn-cta:hover {
      background: var(--accent-dark);
      box-shadow: var(--shadow-glow-orange);
    }
    .hero-image img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow);
      width: 100%;
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-content h1 {
        font-size: 28px;
      }
      .btn-cta {
        width: 100%;
        text-align: center;
      }
    }
    /* 标题 */
    h2 {
      font-size: 28px;
      font-weight: 600;
      line-height: 1.4;
      margin-bottom: 48px;
      text-align: center;
      color: var(--text);
    }
    @media (max-width: 768px) {
      h2 {
        font-size: 22px;
        margin-bottom: 32px;
      }
    }
    /* 卡片 */
    .card-white {
      background: var(--white);
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      padding: 32px 24px;
      transition: all var(--transition);
    }
    .card-glass {
      background: rgba(255,255,255,0.75);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.5);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow);
      padding: 24px;
      transition: all var(--transition);
    }
    .card-glass:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 40px rgba(0,0,0,0.08);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    @media (max-width: 1024px) and (min-width: 769px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
        gap: 16px;
      }
    }
    /* 痛点 */
    .pain-icon {
      width: 48px;
      height: 48px;
      stroke: var(--primary);
      fill: none;
      stroke-width: 1.5px;
      margin-bottom: 16px;
    }
    .card-white h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .card-white p {
      color: var(--text-secondary);
      font-size: 14px;
    }
    /* 解决方案卡片图片 */
    .solution-img {
      width: 100%;
      height: 160px;
      object-fit: cover;
      border-radius: var(--radius) var(--radius) 0 0;
      margin-bottom: 16px;
    }
    .btn-secondary {
      display: inline-block;
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 20px;
      border-radius: var(--radius);
      font-weight: 600;
      font-size: 14px;
      transition: background var(--transition);
      margin-top: 12px;
    }
    .btn-secondary:hover {
      background: rgba(27,94,32,0.08);
    }
    /* 成果区 */
    .results-bg {
      background: rgba(27,94,32,0.04);
      border-radius: var(--radius-lg);
      padding: 48px 32px;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      text-align: center;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.1;
    }
    .stat-label {
      color: var(--text-secondary);
      font-size: 14px;
      margin-top: 8px;
    }
    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr;
        gap: 24px;
      }
    }
    /* 证言 */
    .testimonial-card {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
    }
    .avatar {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      background: #e0e0e0;
      margin-bottom: 16px;
      object-fit: cover;
    }
    .quote {
      font-style: italic;
      font-size: 16px;
      color: var(--text);
      margin-bottom: 12px;
      position: relative;
    }
    .quote::before {
      content: "“";
      font-size: 32px;
      color: var(--primary);
      font-weight: 700;
      margin-right: 4px;
    }
    .author {
      font-size: 14px;
      color: var(--text-secondary);
      font-weight: 500;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--white);
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      border-left: 4px solid var(--primary);
      transition: background var(--transition);
      color: var(--text);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 24px;
      color: var(--text-secondary);
      font-size: 16px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 24px 18px;
    }
    /* CTA区块 */
    .cta-section {
      background: rgba(27,94,32,0.06);
    }
    .cta-content {
      text-align: center;
    }
    .cta-content h2 {
      margin-bottom: 16px;
    }
    .cta-content p {
      color: var(--text-secondary);
      margin-bottom: 32px;
    }
    .btn-link {
      color: var(--primary);
      font-weight: 500;
      margin-left: 20px;
      display: inline-block;
      margin-top: 12px;
    }
    .btn-link:hover {
      text-decoration: underline;
    }
    /* 页脚 */
    .footer {
      background: #121A13;
      color: #B0B8B3;
      padding: 32px 0;
      font-size: 14px;
    }
    .footer-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }
    .footer-brand {
      font-weight: 700;
      color: white;
    }
    @media (max-width: 768px) {
      .footer-content {
        flex-direction: column;
        text-align: center;
      }
    }