/* roulang page: index */
:root {
      --primary-green: #1A7A3A;
      --primary-green-dark: #145E2D;
      --accent-orange: #FF6B35;
      --accent-orange-dark: #E55A2B;
      --bg-light: #F5F6FA;
      --card-bg: #FFFFFF;
      --dark-bg: #1F2937;
      --success: #10B981;
      --warning: #F59E0B;
      --danger: #EF4444;
      --text-primary: #1F2329;
      --text-secondary: #6B7280;
      --border-light: #E5E7EB;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04), 0 4px 16px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.10);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-input: 10px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 640px) {
      .container {
        padding: 0 16px;
      }
    }
    /* 导航栏 */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-light);
      z-index: 100;
      transition: box-shadow 0.3s ease;
    }
    .nav.scrolled {
      box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 32px;
    }
    .logo {
      display: flex;
      align-items: baseline;
      gap: 8px;
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary-green);
      letter-spacing: -0.3px;
    }
    .logo .domain {
      font-size: 0.8rem;
      font-weight: 400;
      color: var(--text-secondary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-secondary);
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-green);
      border-bottom-color: var(--primary-green);
    }
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      border: none;
      border-radius: var(--radius-btn);
      padding: 10px 24px;
      font-weight: 600;
      font-size: 0.95rem;
      cursor: pointer;
      transition: background 0.2s,transform 0.1s,box-shadow 0.2s;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      white-space: nowrap;
      box-shadow: 0 4px 10px rgba(255,107,53,0.3);
    }
    .btn-primary:hover {
      background: var(--accent-orange-dark);
      transform: scale(1.02);
      box-shadow: 0 6px 15px rgba(255,107,53,0.4);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--text-primary);
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px 32px;
        gap: 20px;
        box-shadow: var(--shadow-sm);
        border-bottom: 1px solid var(--border-light);
      }
      .nav-links.mobile-open {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
      .nav-container {
        padding: 0 16px;
      }
    }
    /* 板块间距 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 640px) {
      section {
        padding: 60px 0;
      }
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #E8F5E9 0%, #F5F6FA 100%);
      padding: 140px 0 100px;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      top: -80px;
      right: -80px;
      width: 400px;
      height: 400px;
      background: rgba(26,122,58,0.08);
      border-radius: 50%;
      filter: blur(60px);
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-content {
      flex: 1;
    }
    .hero-image {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 360px;
      border-radius: 32px;
      box-shadow: var(--shadow-hover);
      background-color: #d1d5db;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.25;
      color: var(--primary-green);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero .subtitle {
      font-size: 1.15rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }
    .metric-cards {
      display: flex;
      gap: 20px;
      margin: 32px 0;
    }
    .metric-item {
      background: rgba(255,255,255,0.7);
      backdrop-filter: blur(4px);
      padding: 20px 16px;
      border-radius: var(--radius-card);
      text-align: center;
      flex: 1;
      box-shadow: var(--shadow-sm);
    }
    .metric-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--accent-orange);
      line-height: 1.2;
    }
    .metric-label {
      font-size: 0.9rem;
      color: var(--text-secondary);
      margin-top: 4px;
    }
    @media (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
        gap: 40px;
      }
      .hero-image {
        width: 100%;
        min-height: 280px;
        order: -1;
      }
      .hero h1 {
        font-size: 2.4rem;
      }
      .metric-cards {
        flex-wrap: wrap;
      }
      .metric-item {
        min-width: 100px;
      }
    }
    /* 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .metric-card {
      background: var(--card-bg);
      padding: 28px 20px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      gap: 12px;
      transition: 0.2s;
    }
    .metric-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .metric-value {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--primary-green);
    }
    .trend {
      font-size: 0.9rem;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .trend.up { color: var(--success); }
    @media (max-width: 768px) {
      .metrics-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }
    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 32px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s,box-shadow 0.25s;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    .service-body {
      padding: 20px;
    }
    .service-body h3 {
      font-size: 1.4rem;
      font-weight: 600;
      margin-bottom: 8px;
    }
    .tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 12px;
    }
    .tag {
      background: #E8F5E9;
      color: var(--primary-green);
      padding: 4px 12px;
      border-radius: 30px;
      font-size: 0.8rem;
      font-weight: 500;
    }
    @media (max-width: 768px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 对比区 */
    .comparison-wrapper {
      display: flex;
      gap: 40px;
      align-items: flex-start;
    }
    .compare-card {
      flex: 1;
      padding: 32px;
      border-radius: 24px;
      background: #FEF2F2;
    }
    .compare-card.improved {
      background: #F0FDF4;
      border: 1px solid var(--success);
    }
    .progress-bar {
      height: 10px;
      background: #e5e7eb;
      border-radius: 10px;
      margin: 12px 0;
    }
    .progress-fill {
      height: 100%;
      background: var(--primary-green);
      border-radius: 10px;
      width: 78%;
    }
    @media (max-width: 768px) {
      .comparison-wrapper {
        flex-direction: column;
      }
    }
    /* FAQ */
    .faq-item {
      background: var(--card-bg);
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      cursor: pointer;
      font-size: 1.2rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
    }
    .faq-answer.open {
      max-height: 300px;
      margin-top: 16px;
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #1A7A3A 0%, #0D9488 100%);
    }
    .cta-card {
      background: white;
      border-radius: 32px;
      padding: 48px;
      max-width: 700px;
      margin: 0 auto;
      text-align: center;
    }
    .input-group {
      display: flex;
      gap: 12px;
      margin-top: 24px;
    }
    .input-group input {
      flex: 1;
      padding: 14px 16px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-input);
      font-size: 1rem;
      transition: 0.2s;
    }
    .input-group input:focus {
      border-color: var(--primary-green);
      box-shadow: 0 0 0 3px rgba(26,122,58,0.2);
      outline: none;
    }
    @media (max-width: 640px) {
      .input-group {
        flex-direction: column;
      }
    }
    /* Footer */
    .footer {
      background: var(--dark-bg);
      color: #D1D5DB;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 30px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    h2 {
      font-size: 2rem;
      font-weight: 600;
      margin-bottom: 32px;
    }