/* roulang page: index */
:root {
      --primary-green: #1B8A4A;
      --primary-dark: #15703B;
      --black-soft: #1A1A1A;
      --warm-white: #FAFAF7;
      --bamboo-light: #E8F0E4;
      --accent-orange: #F56C2D;
      --accent-orange-dark: #E0551A;
      --success: #2DA44E;
      --text-main: #1A1A1A;
      --text-secondary: #5C6B5E;
      --text-muted: #8B9A8D;
      --border-light: #DDE4DB;
      --card-bg: #FFFFFF;
      --shadow-card: 0 1px 4px rgba(26,26,26,0.04);
      --shadow-card-hover: 0 4px 20px rgba(26,26,26,0.06);
      --shadow-nav: 0 1px 8px rgba(26,26,26,0.05);
      --shadow-btn: 0 4px 12px rgba(27,138,74,0.25);
      --radius-lg: 12px;
      --radius-md: 8px;
      --radius-sm: 4px;
      --font-1: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --container-max: 1200px;
      --section-padding: 80px;
      --card-padding: 24px;
      --gap: 24px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-1);
      background-color: var(--warm-white);
      color: var(--text-main);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(8px);
      z-index: 1000;
      transition: box-shadow 0.2s ease;
      border-bottom: 1px solid transparent;
    }
    .site-header.scrolled {
      box-shadow: var(--shadow-nav);
      border-bottom-color: var(--border-light);
    }
    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 22px;
      color: var(--black-soft);
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--primary-green);
      border-radius: 50%;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .logo-icon::before {
      content: "🐼";
      font-size: 20px;
      color: white;
      line-height: 1;
    }
    .nav-menu {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }
    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      color: var(--primary-green);
      border-bottom-color: var(--primary-green);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--black-soft);
      transition: 0.3s;
    }
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 32px 24px;
        gap: 24px;
        box-shadow: var(--shadow-nav);
        transform: translateY(-150%);
        opacity: 0;
        transition: 0.25s ease;
        pointer-events: none;
      }
      .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
      }
      .hamburger {
        display: flex;
      }
      .nav-menu a {
        font-size: 18px;
      }
    }
    /* 按钮 */
    .btn {
      display: inline-block;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-md);
      transition: all 0.2s ease;
      cursor: pointer;
      border: 1.5px solid transparent;
      text-align: center;
    }
    .btn-primary {
      background: var(--primary-green);
      color: white;
      border-color: var(--primary-green);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: var(--shadow-btn);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      border-color: var(--primary-green);
      color: var(--primary-green);
    }
    .btn-outline:hover {
      background: rgba(27,138,74,0.08);
    }
    .btn-accent {
      background: var(--accent-orange);
      color: white;
      border-color: var(--accent-orange);
    }
    .btn-accent:hover {
      background: var(--accent-orange-dark);
      box-shadow: 0 4px 14px rgba(245,108,45,0.3);
      transform: translateY(-2px);
    }
    /* 板块通用 */
    section {
      padding: var(--section-padding) 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--black-soft);
    }
    .section-sub {
      font-size: 16px;
      color: var(--text-secondary);
      max-width: 600px;
      margin-bottom: 40px;
    }
    .bg-light {
      background-color: var(--bamboo-light);
    }
    .bg-dark {
      background-color: var(--black-soft);
      color: white;
    }
    /* Hero */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      min-height: 85vh;
      padding-top: 100px;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--black-soft);
    }
    .hero p {
      font-size: 16px;
      color: var(--text-secondary);
      margin: 20px 0 28px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      background: linear-gradient(135deg, #1B8A4A20, #1B8A4A05);
      border-radius: 24px;
      height: 360px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 32px;
      }
      .hero h1 {
        font-size: 36px;
      }
      .hero-image {
        height: 260px;
        order: -1;
      }
      .hero-buttons {
        justify-content: center;
      }
    }
    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: var(--gap);
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: var(--gap);
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: var(--card-padding);
      box-shadow: var(--shadow-card);
      transition: all 0.2s ease;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      border: 1.5px solid var(--primary-green);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      color: var(--primary-green);
      font-size: 22px;
    }
    .stats-number {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary-green);
    }
    .case-card img {
      border-radius: var(--radius-lg) var(--radius-lg) 0 0;
      aspect-ratio: 16/9;
      object-fit: cover;
      background: var(--bamboo-light);
    }
    .service-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      margin-bottom: 60px;
    }
    .service-img {
      background: var(--bamboo-light);
      border-radius: var(--radius-lg);
      height: 280px;
      background-size: cover;
      background-position: center;
    }
    @media (max-width: 1024px) {
      .grid-3, .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .service-row {
        grid-template-columns: 1fr;
        gap: 24px;
      }
      .service-row.reverse {
        display: flex;
        flex-direction: column-reverse;
      }
    }
    @media (max-width: 640px) {
      .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      .section-title {
        font-size: 26px;
      }
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text-main);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      font-size: 14px;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      color: #eee;
    }
    .footer-bottom {
      border-top: 1px solid #333;
      margin-top: 32px;
      padding-top: 24px;
      text-align: center;
      font-size: 14px;
      color: #aaa;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }