/* roulang page: index */
:root {
      --primary-green: #2E7D32;
      --primary-dark: #1B5E20;
      --accent-red: #D84315;
      --bg-warm: #FAFAF6;
      --card-bg: #FFFFFF;
      --soft-green-bg: #E8F0E4;
      --text-heading: #1B2A1A;
      --text-body: #3A4A38;
      --text-muted: #6B7A68;
      --border-light: #DCE5D8;
      --shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.06);
      --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.10);
      --radius-md: 12px;
      --radius-btn: 8px;
      --transition: all 0.25s ease;
      --container-max: 1200px;
    }

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

    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input, textarea {
      font-family: inherit;
      font-size: 16px;
    }

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

    /* 导航区域 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: #FFFFFF;
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      display: flex;
      align-items: center;
      z-index: 1000;
      padding: 0 32px;
    }

    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--primary-green);
      letter-spacing: 0.5px;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary-green);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: bold;
      font-size: 18px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-heading);
      transition: var(--transition);
      padding: 4px 0;
      border-bottom: 2px solid transparent;
    }

    .nav-menu a:hover {
      color: var(--primary-green);
      border-bottom-color: var(--primary-green);
    }

    .cta-btn {
      background: var(--primary-green);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      border: none;
      cursor: pointer;
      display: inline-block;
      white-space: nowrap;
    }

    .cta-btn:hover {
      background: var(--primary-dark);
    }

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

    .hamburger span {
      width: 24px;
      height: 2.5px;
      background: var(--text-heading);
      border-radius: 2px;
      transition: var(--transition);
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 64px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        align-items: flex-start;
        padding: 32px 24px;
        gap: 24px;
        box-shadow: 0 12px 24px rgba(0,0,0,0.08);
        transform: translateY(-150%);
        opacity: 0;
        transition: transform 0.3s ease, opacity 0.2s ease;
        z-index: 999;
      }

      .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
      }

      .hamburger {
        display: flex;
      }
    }

    /* Hero 区块 */
    .hero {
      margin-top: 64px;
      height: 90vh;
      min-height: 600px;
      background: linear-gradient(0deg, rgba(27,42,26,0.65) 0%, rgba(27,42,26,0.2) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      position: relative;
    }

    .hero-content {
      max-width: 700px;
      margin-left: 8%;
      color: white;
      position: relative;
      z-index: 2;
    }

    .hero h1 {
      font-size: clamp(36px, 5vw, 56px);
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
      color: white;
    }

    .hero p {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 40px;
    }

    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .btn-primary {
      background: var(--primary-green);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      transition: var(--transition);
    }

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

    .btn-outline-white {
      background: transparent;
      color: white;
      border: 2px solid white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
    }

    .btn-outline-white:hover {
      background: rgba(255,255,255,0.15);
    }

    @media (max-width: 768px) {
      .hero {
        height: 70vh;
      }
      .hero-content {
        margin-left: 16px;
        margin-right: 16px;
      }
    }

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

    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-heading);
      text-align: center;
      margin-bottom: 16px;
    }

    .section-desc {
      text-align: center;
      color: var(--text-muted);
      max-width: 600px;
      margin: 0 auto 48px;
    }

    /* 服务卡片 - 非对称网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      display: flex;
      gap: 20px;
      transition: var(--transition);
    }

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

    .service-icon {
      width: 48px;
      height: 48px;
      background: var(--soft-green-bg);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      color: var(--primary-green);
      flex-shrink: 0;
    }

    .service-text h3 {
      font-size: 20px;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-heading);
    }

    .service-link {
      color: var(--primary-green);
      font-weight: 600;
      display: inline-block;
      margin-top: 12px;
    }

    @media (max-width: 900px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
      .service-card {
        flex-direction: row;
      }
    }

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

    .stat-item {
      background: var(--soft-green-bg);
      border-radius: var(--radius-md);
      padding: 32px 16px;
    }

    .stat-number {
      font-size: 42px;
      font-weight: 700;
      color: var(--accent-red);
    }

    .stat-label {
      color: var(--text-muted);
      margin-top: 8px;
    }

    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      cursor: pointer;
    }

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

    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }

    .case-info {
      padding: 24px;
    }

    .case-tag {
      background: transparent;
      border: 1px solid var(--primary-green);
      color: var(--primary-green);
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 14px;
      display: inline-block;
      margin-bottom: 8px;
    }

    @media (max-width: 768px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 流程条 */
    .process-flow {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 24px;
    }

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

    .step-circle {
      width: 56px;
      height: 56px;
      background: var(--primary-green);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 24px;
      margin: 0 auto 16px;
    }

    .step h3 {
      font-size: 20px;
      margin-bottom: 8px;
      color: var(--text-heading);
    }

    @media (max-width: 768px) {
      .process-flow {
        flex-direction: column;
        gap: 32px;
      }
    }

    /* FAQ */
    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      padding: 20px 24px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }

    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-heading);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 16px;
    }

    /* 联系 CTA */
    .cta-section {
      background: #1B2A1A;
      color: white;
      padding: 80px 0;
    }

    .cta-form {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 40px;
    }

    .cta-form input {
      padding: 14px;
      border-radius: 8px;
      border: none;
      flex: 1 1 200px;
    }

    .btn-red {
      background: var(--accent-red);
      color: white;
      border: none;
      padding: 14px 36px;
      border-radius: 8px;
      font-weight: 600;
      cursor: pointer;
    }

    /* 页脚 */
    .site-footer {
      background: #0F1A0E;
      color: #B8C5B3;
      padding: 60px 0 20px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }