/* roulang page: index */
:root {
      --primary-green: #0A6E3F;
      --primary-green-hover: #085a33;
      --accent-orange: #F15A24;
      --accent-orange-hover: #d94d1a;
      --bg-warm: #F7F5F2;
      --bg-deep: #0B2B1F;
      --card-white: #FFFFFF;
      --text-heading: #1A1A1A;
      --text-body: #3D3D3D;
      --text-muted: #6B6B6B;
      --border-light: #DDE5E0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 6px 20px rgba(0,0,0,0.10);
      --font-sans: 'PingFang SC', 'Microsoft YaHei', -apple-system, 'Segoe UI', system-ui, sans-serif;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
    }
    
    /* 导航 */
    #header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: #FFFFFF;
      height: 68px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      display: flex;
      align-items: center;
    }
    
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary-green);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: 0.5px;
    }
    
    .logo i {
      font-size: 24px;
      color: var(--accent-orange);
    }
    
    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    
    .nav-menu a {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary-green);
    }
    
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-green);
      transition: width 0.25s ease;
    }
    
    .nav-menu a:hover::after {
      width: 100%;
    }
    
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 4px;
    }
    
    .hamburger span {
      width: 24px;
      height: 3px;
      background: var(--primary-green);
      border-radius: 2px;
      transition: all 0.3s;
    }
    
    /* 英雄区 */
    #hero {
      background: linear-gradient(135deg, #F7F5F2 0%, #EDF3EF 100%);
      padding: 80px 0;
      position: relative;
      overflow: hidden;
    }
    
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }
    
    .hero-left {
      flex: 1 1 400px;
    }
    
    .hero-right {
      flex: 1 1 400px;
      position: relative;
    }
    
    .hero-right img {
      border-radius: 16px;
      box-shadow: 0 20px 30px rgba(0,0,0,0.15);
      width: 100%;
      object-fit: cover;
    }
    
    h1 {
      font-size: clamp(2.4rem, 5vw, 3.4rem);
      font-weight: 700;
      line-height: 1.2;
      color: var(--text-heading);
      margin-bottom: 20px;
    }
    
    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 500px;
    }
    
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    
    .btn-primary {
      background: var(--primary-green);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      border: 2px solid var(--primary-green);
    }
    
    .btn-primary:hover {
      background: var(--primary-green-hover);
      border-color: var(--primary-green-hover);
      transform: translateY(-2px);
    }
    
    .btn-secondary {
      background: transparent;
      color: var(--primary-green);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      border: 2px solid var(--primary-green);
      transition: all 0.25s ease;
    }
    
    .btn-secondary:hover {
      background: rgba(10, 110, 63, 0.08);
      transform: translateY(-2px);
    }
    
    .btn-accent {
      background: var(--accent-orange);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1.1rem;
      transition: all 0.25s ease;
      border: 2px solid var(--accent-orange);
    }
    
    .btn-accent:hover {
      background: var(--accent-orange-hover);
      transform: scale(1.03);
    }
    
    /* 区块通用 */
    section {
      padding: 80px 0;
    }
    
    .section-title {
      font-size: clamp(1.8rem, 4vw, 2.2rem);
      font-weight: 600;
      color: var(--text-heading);
      margin-bottom: 16px;
      text-align: center;
    }
    
    .section-desc {
      color: var(--text-muted);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 48px;
      font-size: 1.1rem;
    }
    
    /* 功能卡片 */
    .features-grid {
      display: flex;
      gap: 30px;
      justify-content: center;
      flex-wrap: wrap;
    }
    
    .feature-card {
      background: var(--card-white);
      padding: 32px 24px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      flex: 1 1 240px;
      max-width: 280px;
      text-align: center;
      transition: all 0.25s ease;
    }
    
    .feature-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-5px);
    }
    
    .icon-circle {
      width: 64px;
      height: 64px;
      background: #EDF3EF;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      color: var(--primary-green);
      font-size: 28px;
      transition: all 0.3s;
    }
    
    .feature-card:hover .icon-circle {
      background: var(--primary-green);
      color: white;
    }
    
    .feature-card h3 {
      font-size: 1.3rem;
      margin-bottom: 8px;
      color: var(--text-heading);
    }
    
    /* 场景卡片 */
    .scenarios-grid {
      display: flex;
      gap: 30px;
      flex-wrap: wrap;
    }
    
    .scenario-card {
      flex: 1 1 280px;
      background: var(--card-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: 0.25s;
    }
    
    .scenario-card:hover {
      box-shadow: var(--shadow-card-hover);
    }
    
    .scenario-img {
      height: 180px;
      overflow: hidden;
    }
    
    .scenario-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s;
    }
    
    .scenario-card:hover .scenario-img img {
      transform: scale(1.03);
    }
    
    .scenario-text {
      padding: 24px;
    }
    
    /* 案例深色区 */
    #cases {
      background: var(--bg-deep);
      color: white;
    }
    
    .cases-grid {
      display: flex;
      gap: 30px;
      flex-wrap: wrap;
    }
    
    .case-card {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(4px);
      border-radius: var(--radius-card);
      padding: 32px;
      flex: 1 1 250px;
    }
    
    .case-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent-orange);
    }
    
    /* 价格卡片 */
    .pricing-grid {
      display: flex;
      gap: 30px;
      align-items: stretch;
      justify-content: center;
      flex-wrap: wrap;
    }
    
    .pricing-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 36px 28px;
      box-shadow: var(--shadow-card);
      flex: 1 1 260px;
      max-width: 320px;
      display: flex;
      flex-direction: column;
      border: 2px solid transparent;
    }
    
    .pricing-card.featured {
      border-color: var(--accent-orange);
      transform: scale(1.02);
      box-shadow: 0 10px 25px rgba(0,0,0,0.08);
    }
    
    .price {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--primary-green);
    }
    
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-btn);
      margin-bottom: 12px;
      box-shadow: 0 1px 6px rgba(0,0,0,0.04);
    }
    
    .faq-question {
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
    }
    
    .faq-answer {
      padding: 0 24px 18px;
      display: none;
      color: var(--text-muted);
    }
    
    .faq-item.active .faq-answer {
      display: block;
    }
    
    /* CTA尾区 */
    #cta {
      background: var(--bg-deep);
      text-align: center;
      color: white;
    }
    
    /* 页脚 */
    #footer {
      background: #1A1A1A;
      color: #B0B0B0;
      padding: 48px 0 24px;
    }
    
    .footer-grid {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 30px;
    }
    
    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      .nav-menu {
        gap: 20px;
      }
    }
    
    @media (max-width: 768px) {
      .hamburger {
        display: flex;
      }
      .nav-menu {
        display: none;
        position: fixed;
        top: 68px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 30px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
      }
      .nav-menu.active {
        display: flex;
      }
      .features-grid, .scenarios-grid, .cases-grid, .pricing-grid {
        flex-direction: column;
        align-items: center;
      }
    }