/* roulang page: index */
:root {
      --primary: #6BCB3C;
      --primary-hover: #5AB02E;
      --primary-light: #F0FAE8;
      --secondary: #2E3A2C;
      --bg: #FAFBF7;
      --surface: #FFFFFF;
      --text: #1F2329;
      --text-secondary: #86909C;
      --border-light: #E8ECE4;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 24px;
      --shadow-card: 0 2px 8px rgba(46,58,44,0.04);
      --shadow-card-hover: 0 4px 16px rgba(46,58,44,0.06), 0 1px 4px rgba(46,58,44,0.04);
      --shadow-nav: 0 1px 0 rgba(46,58,44,0.06);
      --transition: 200ms ease;
      --max-width: 1200px;
      --header-height: 64px;
    }

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

    body {
      font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      font-size: 15px;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

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

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 16px;
    }

    @media (min-width: 768px) {
      .container {
        padding: 0 24px;
      }
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: var(--shadow-nav);
      display: flex;
      align-items: center;
      z-index: 100;
      transition: background var(--transition);
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 20px;
      color: var(--secondary);
      letter-spacing: 0.5px;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><circle cx="12" cy="12" r="10" fill="white"/><circle cx="12" cy="12" r="4" fill="%232E3A2C"/></svg>') center/contain no-repeat;
      background-color: var(--primary);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-weight: 500;
      color: var(--text);
    }

    .nav-links a {
      font-size: 15px;
      transition: color var(--transition);
      position: relative;
    }

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

    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 1px;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 4px 12px rgba(107,203,60,0.3);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      transition: background var(--transition), color var(--transition);
    }

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

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

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

    @media (max-width: 767px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: var(--bg);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 32px;
        font-size: 18px;
        display: none;
        z-index: 99;
      }
      .mobile-menu.open {
        display: flex;
      }
    }

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

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      flex-wrap: wrap;
    }

    .hero-text {
      flex: 1 1 45%;
    }

    .hero-image {
      flex: 1 1 45%;
      background: linear-gradient(135deg, rgba(107,203,60,0.12) 0%, rgba(46,58,44,0.02) 100%);
      border-radius: var(--radius-card);
      overflow: hidden;
      position: relative;
    }

    .hero-image img {
      width: 100%;
      height: 360px;
      object-fit: cover;
      border-radius: var(--radius-card);
    }

    .hero h1 {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.3;
      color: var(--secondary);
      margin-bottom: 16px;
    }

    .hero .subtitle {
      font-size: 16px;
      color: var(--text-secondary);
      margin-bottom: 28px;
    }

    .hero-cta-small {
      font-size: 13px;
      color: var(--text-secondary);
      margin-top: 12px;
    }

    @media (max-width: 767px) {
      .hero-grid {
        flex-direction: column;
      }
      .hero h1 {
        font-size: 32px;
      }
      .hero-image img {
        height: 260px;
      }
    }

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

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

    .section-sub {
      color: var(--text-secondary);
      text-align: center;
      max-width: 640px;
      margin: 0 auto 48px;
    }

    /* 功能错位布局 */
    .features-grid {
      display: flex;
      flex-direction: column;
      gap: 28px;
    }

    .feature-wide {
      display: flex;
      background: var(--surface);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: var(--transition);
    }

    .feature-wide:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-2px);
    }

    .feature-wide-img {
      flex: 1;
      background: #eef6e8;
    }

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

    .feature-wide-text {
      flex: 1;
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .feature-cards-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border-top: 4px solid transparent;
    }

    .feature-card:nth-child(2) {
      border-top: 4px solid var(--primary);
    }

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

    .feature-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
    }

    @media (max-width: 767px) {
      .feature-wide {
        flex-direction: column;
      }
      .feature-cards-row {
        grid-template-columns: 1fr;
      }
    }

    /* 场景 */
    .scenario-item {
      display: flex;
      align-items: center;
      gap: 40px;
      margin-bottom: 48px;
      background: var(--surface);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    .scenario-item.reverse {
      flex-direction: row-reverse;
    }

    .scenario-img {
      flex: 1;
    }

    .scenario-img img {
      width: 100%;
      height: 280px;
      object-fit: cover;
    }

    .scenario-text {
      flex: 1;
      padding: 32px;
    }

    .tag {
      background: var(--primary-light);
      color: var(--primary);
      font-size: 13px;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 12px;
    }

    @media (max-width: 767px) {
      .scenario-item, .scenario-item.reverse {
        flex-direction: column;
      }
    }

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

    .case-card {
      background: var(--surface);
      border-left: 4px solid var(--primary);
      border-radius: 8px;
      padding: 20px;
      box-shadow: var(--shadow-card);
    }

    @media (max-width: 767px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 价格 */
    .pricing-row {
      display: flex;
      gap: 24px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .pricing-card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      flex: 1 1 280px;
      max-width: 320px;
      text-align: center;
    }

    .pricing-card.featured {
      border: 2px solid var(--primary);
      transform: scale(1.03);
    }

    .price {
      font-size: 32px;
      font-weight: 700;
      color: var(--secondary);
      margin: 16px 0;
    }

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

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }

    .faq-question {
      font-weight: 600;
      color: var(--secondary);
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .faq-answer {
      color: var(--text-secondary);
      margin-top: 8px;
      display: none;
    }

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

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

    .cta-section h2 {
      color: white;
    }

    .btn-white {
      background: white;
      color: var(--primary);
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
    }

    /* Footer */
    .footer {
      background: var(--secondary);
      color: rgba(255,255,255,0.8);
      padding: 48px 0 24px;
    }

    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 32px;
    }

    .copyright {
      color: rgba(255,255,255,0.5);
      font-size: 12px;
      margin-top: 32px;
      text-align: center;
    }

    @media (max-width: 767px) {
      .footer-grid {
        flex-direction: column;
      }
    }