/* roulang page: index */
:root {
      --primary: #0A7E3D;
      --primary-hover: #065A2D;
      --primary-light: rgba(10, 126, 61, 0.08);
      --secondary-dark: #1A1A2E;
      --accent: #F5A623;
      --accent-hover: #e09510;
      --bg: #FAFBF7;
      --card-bg: #FFFFFF;
      --border: #E8EDE4;
      --text-main: #1e2b21;
      --text-secondary: #5A6A5E;
      --text-light: #8b9a8e;
      --white: #FFFFFF;
      --shadow-card: 0 2px 16px rgba(10, 126, 61, 0.06);
      --shadow-hover: 0 8px 28px rgba(10, 126, 61, 0.12);
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "思源黑体", system-ui, -apple-system, sans-serif;
      --max-width: 1200px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.02);
      height: 72px;
      display: flex;
      align-items: center;
      z-index: 100;
      border-bottom: 1px solid rgba(232, 237, 228, 0.7);
      transition: height 0.2s;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.3px;
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--primary) 0%, #065A2D 100%);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 700;
      font-size: 20px;
      position: relative;
    }

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

    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      padding: 6px 0;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }

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

    .btn-primary-nav {
      background: var(--primary);
      color: white;
      padding: 10px 22px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 14px;
      transition: background 0.2s, transform 0.1s;
      margin-left: 12px;
      white-space: nowrap;
    }

    .btn-primary-nav:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      width: 28px;
      cursor: pointer;
    }

    .hamburger span {
      width: 100%;
      height: 2px;
      background: var(--secondary-dark);
      border-radius: 2px;
      transition: 0.2s;
    }

    @media (max-width: 1024px) {
      .nav-menu {
        gap: 20px;
      }
    }

    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }
      .btn-primary-nav.desktop-only {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .mobile-menu.active {
        display: flex;
      }
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: white;
      flex-direction: column;
      padding: 24px;
      gap: 20px;
      box-shadow: 0 12px 24px rgba(0,0,0,0.05);
      z-index: 99;
      border-top: 1px solid var(--border);
    }

    .mobile-menu a {
      font-size: 18px;
      font-weight: 500;
      padding: 8px 0;
      border-bottom: 1px solid var(--border);
    }

    /* Hero */
    .hero {
      min-height: 85vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, #FAFBF7 0%, #EDF5EE 100%);
      margin-top: 72px;
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 60px;
      width: 100%;
    }

    .hero-text {
      flex: 1 1 50%;
    }

    .hero-image {
      flex: 1 1 50%;
      position: relative;
    }

    .hero-image img {
      border-radius: 18px;
      box-shadow: 0 20px 35px rgba(10, 126, 61, 0.15);
      width: 100%;
      object-fit: cover;
    }

    .hero h1 {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--secondary-dark);
      margin-bottom: 18px;
      letter-spacing: -0.5px;
    }

    .hero-sub {
      font-size: 18px;
      color: #5A6A5E;
      margin-bottom: 32px;
      max-width: 500px;
    }

    .btn-accent {
      background: var(--accent);
      color: white;
      padding: 14px 36px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 18px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: background 0.2s, transform 0.2s;
      box-shadow: 0 6px 16px rgba(245, 166, 35, 0.3);
    }

    .btn-accent:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
    }

    @media (max-width: 1024px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-text {
        max-width: 100%;
      }
      .hero h1 {
        font-size: 42px;
      }
    }

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

    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-title h2 {
      font-size: 34px;
      font-weight: 700;
      color: var(--secondary-dark);
    }

    .section-title p {
      color: var(--text-secondary);
      font-size: 16px;
      margin-top: 10px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      border: 1px solid rgba(232, 237, 228, 0.6);
    }

    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .card h3 {
      font-size: 22px;
      font-weight: 600;
      margin: 16px 0 10px;
    }

    .service-card {
      display: flex;
      gap: 20px;
      align-items: center;
      border-bottom: 3px solid var(--primary);
      transition: 0.2s;
      background: white;
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-card);
    }

    .service-card:hover {
      border-bottom-width: 6px;
    }

    .service-card img {
      width: 80px;
      height: 80px;
      border-radius: 10px;
      object-fit: cover;
    }

    .dark-block {
      background: var(--secondary-dark);
      color: white;
      border-radius: 24px;
      padding: 60px 40px;
      text-align: center;
    }

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

    .stat-number {
      font-size: 46px;
      font-weight: 700;
      color: var(--accent);
    }

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

    .case-card img {
      border-radius: 10px;
      transition: transform 0.3s;
    }

    .case-card:hover img {
      transform: scale(1.03);
    }

    .solution-row {
      display: flex;
      gap: 50px;
      margin-bottom: 60px;
      align-items: center;
    }

    .solution-row.reverse {
      flex-direction: row-reverse;
    }

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

    .faq-question {
      background: #FAFBF7;
      padding: 20px;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .faq-answer {
      padding: 0 20px 20px;
      display: none;
    }

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

    .cta-green {
      background: var(--primary);
      border-radius: 24px;
      padding: 70px 30px;
      text-align: center;
      color: white;
    }

    .btn-white {
      background: white;
      color: var(--primary);
      padding: 14px 38px;
      border-radius: 40px;
      font-weight: 700;
    }

    footer {
      background: var(--secondary-dark);
      color: #ccc;
      padding: 60px 0 30px;
    }

    @media (max-width: 768px) {
      .grid-3, .cases-grid, .stats {
        grid-template-columns: 1fr;
      }
      .solution-row {
        flex-direction: column;
      }
      .hero h1 {
        font-size: 36px;
      }
    }