/* roulang page: index */
:root {
      --primary: #1E5F3A;
      --primary-hover: #164B2E;
      --accent: #F5A623;
      --accent-light: #FFD58C;
      --bg-light: #F7F9F8;
      --bg-white: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-secondary: #5F6B6A;
      --text-muted: #8C9694;
      --border-light: #E8ECEA;
      --border-input: #D0D6D4;
      --shadow-card: 0 2px 8px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.12);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-input: 8px;
      --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --max-width: 1200px;
      --section-gap: 100px;
      --mobile-gap: 70px;
    }

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

    body {
      font-family: var(--font-family);
      background: var(--bg-white);
      color: var(--text-dark);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    /* 导航栏：搜索主导型，sticky */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 99;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(8px);
      transition: box-shadow 0.2s ease, background 0.2s;
      border-bottom: 1px solid transparent;
    }

    .site-header.scrolled {
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
      background: #fff;
      border-bottom: 1px solid var(--border-light);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 0;
      gap: 20px;
      flex-wrap: wrap;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      white-space: nowrap;
    }

    .logo-icon {
      font-size: 1.8rem;
      color: var(--accent);
    }

    .search-wrapper {
      flex: 1;
      max-width: 480px;
      position: relative;
      margin: 0 10px;
    }

    .search-wrapper i {
      position: absolute;
      left: 16px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--text-muted);
      font-size: 1rem;
    }

    .search-input {
      width: 100%;
      height: 48px;
      background: #F0F2F1;
      border: 1px solid transparent;
      border-radius: var(--radius-input);
      padding: 0 20px 0 44px;
      font-size: 0.95rem;
      color: var(--text-dark);
      outline: none;
      transition: 0.2s;
    }

    .search-input:focus {
      border-color: var(--primary);
      background: #fff;
      box-shadow: 0 0 0 3px rgba(30,95,58,0.08);
    }

    .search-input::placeholder {
      color: var(--text-muted);
    }

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

    .nav-links a {
      transition: color 0.2s;
      font-size: 0.95rem;
    }

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

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.6rem;
      color: var(--text-dark);
      cursor: pointer;
    }

    /* sections 通用间距 */
    .section {
      padding: var(--section-gap) 0;
    }

    .bg-alternate {
      background-color: var(--bg-light);
    }

    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      gap: 50px;
      flex-wrap: wrap;
    }

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

    .hero-content h1 {
      font-size: 2.8rem;
      font-weight: 800;
      line-height: 1.2;
      color: var(--text-dark);
      margin-bottom: 18px;
    }

    .hero-content .subtitle {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 28px;
      max-width: 480px;
    }

    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      font-size: 1rem;
      transition: all 0.25s;
      cursor: pointer;
      border: 2px solid transparent;
      min-width: 140px;
    }

    .btn-primary {
      background: var(--primary);
      color: #fff;
      border-color: var(--primary);
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      border-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: var(--shadow-hover);
    }

    .btn-outline {
      background: transparent;
      color: var(--primary);
      border-color: var(--primary);
    }

    .btn-outline:hover {
      background: var(--primary);
      color: #fff;
    }

    .hero-image {
      flex: 1 1 45%;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
      background: linear-gradient(135deg, rgba(30,95,58,0.08) 0%, rgba(245,166,35,0.1) 100%);
    }

    .hero-image img {
      width: 100%;
      height: auto;
      object-fit: cover;
      aspect-ratio: 4/3;
    }

    /* 区块标题 */
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-dark);
    }

    .section-sub {
      color: var(--text-secondary);
      margin-bottom: 40px;
    }

    /* 卡片网格 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: #fff;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
    }

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

    .feature-icon {
      font-size: 2.2rem;
      color: var(--accent);
      margin-bottom: 18px;
    }

    .feature-card h3 {
      font-weight: 700;
      font-size: 1.3rem;
      margin-bottom: 10px;
    }

    /* 场景图文 */
    .scene-row {
      display: flex;
      align-items: center;
      gap: 50px;
      margin-bottom: 60px;
      flex-wrap: wrap;
    }

    .scene-text {
      flex: 1;
    }

    .scene-img {
      flex: 1;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    /* 数据卡片 */
    .stats-grid {
      display: flex;
      justify-content: center;
      gap: 40px;
      flex-wrap: wrap;
      margin: 30px 0;
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
    }

    /* FAQ */
    .faq-item {
      background: #fff;
      border-radius: 12px;
      margin-bottom: 12px;
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      border-bottom: 1px solid var(--border-light);
    }

    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-secondary);
      display: none;
    }

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

    /* CTA区块 */
    .cta-box {
      background: linear-gradient(105deg, #F7F9F8 0%, #EFF5F1 100%);
      border-radius: 28px;
      padding: 60px 30px;
      text-align: center;
    }

    .subscribe-form {
      display: flex;
      max-width: 450px;
      margin: 24px auto 0;
      gap: 8px;
    }

    .subscribe-form input {
      flex: 1;
      height: 48px;
      border: 1px solid var(--border-input);
      border-radius: var(--radius-input);
      padding: 0 16px;
    }

    /* 页脚 */
    .site-footer {
      background: #1A2B24;
      color: #B0BAB7;
      padding: 50px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    .footer-logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: #fff;
    }

    @media (max-width: 1024px) {
      .card-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .hero { flex-direction: column; }
      .hero-content h1 { font-size: 2rem; }
      .section { padding: var(--mobile-gap) 0; }
      .card-grid { grid-template-columns: 1fr; }
      .nav-links { display: none; }
      .mobile-menu-toggle { display: block; }
      .search-wrapper { order: 1; width: 100%; margin: 8px 0; }
      .header-inner { flex-wrap: wrap; }
      .stats-grid { gap: 20px; }
    }