/* roulang page: index */
:root {
      --primary: #0A9E5A;
      --primary-hover: #078A4B;
      --primary-light: #E6F7EF;
      --accent: #FF6B35;
      --accent-hover: #e55a2a;
      --bg: #F7F9FC;
      --white: #FFFFFF;
      --dark-bg: #0A2E1A;
      --dark-bg2: #0A3D24;
      --text: #1e293b;
      --text-light: #475569;
      --text-muted: #64748b;
      --border: #e2e8f0;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.04);
      --shadow: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
      --radius-sm: 8px;
      --radius: 16px;
      --radius-pill: 40px;
      --radius-full: 9999px;
      --font-title: 'PingFang SC Bold', 'Microsoft YaHei Bold', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC Regular', 'Microsoft YaHei', 'Helvetica Neue', system-ui, sans-serif;
      --font-number: 'DIN Alternate Bold', 'PingFang SC Bold', 'Microsoft YaHei Bold', sans-serif;
      --nav-height: 72px;
      --max-width: 1280px;
      --transition: 0.25s ease;
    }

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

    html {
      scroll-padding-top: var(--nav-height);
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-body);
      background: var(--bg);
      color: var(--text);
      line-height: 1.6;
      font-size: 16px;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-body);
      transition: all var(--transition);
      border: none;
      outline: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

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

    /* 导航 */
    header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 rgba(0,0,0,0.03), 0 8px 24px rgba(0,0,0,0.03);
      z-index: 50;
      transition: background var(--transition);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 24px;
      font-weight: 700;
      color: var(--text);
      font-family: var(--font-title);
      letter-spacing: 1px;
    }
    .logo-icon {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--primary) 0%, #087A44 100%);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      font-size: 20px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
      font-size: 16px;
      font-weight: 500;
    }
    .nav-links a {
      color: var(--text);
      transition: color 0.2s;
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      width: 24px;
      height: 20px;
      justify-content: space-between;
      background: transparent;
      border: none;
      cursor: pointer;
    }
    .hamburger span {
      display: block;
      height: 2.5px;
      width: 100%;
      background: var(--text);
      border-radius: 2px;
      transition: 0.2s;
    }

    /*  hero */
    .hero {
      margin-top: var(--nav-height);
      display: grid;
      grid-template-columns: 1fr 1.1fr;
      gap: 48px;
      align-items: center;
      padding: 60px 0 70px;
      min-height: 520px;
    }
    .hero-content h1 {
      font-size: 44px;
      line-height: 1.3;
      font-family: var(--font-title);
      color: #0a2e1a;
      margin-bottom: 20px;
    }
    .hero-content p {
      font-size: 18px;
      color: var(--text-light);
      margin-bottom: 32px;
      line-height: 1.7;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      background: var(--primary);
      color: white;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
      box-shadow: 0 10px 24px rgba(10,158,90,0.25);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 14px 30px;
      border-radius: var(--radius-pill);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: var(--primary-light);
      border-color: var(--primary);
      transform: translateY(-1px);
    }
    .hero-image img {
      border-radius: 28px;
      box-shadow: var(--shadow-lg);
      width: 100%;
      object-fit: cover;
    }

    /* 数据徽章带 */
    .stats-strip {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 20px;
      margin-top: -30px;
      margin-bottom: 60px;
    }
    .stat-badge {
      background: white;
      border-radius: var(--radius);
      padding: 24px 20px;
      text-align: center;
      box-shadow: var(--shadow);
      transition: transform 0.2s;
      border: 1px solid rgba(0,0,0,0.02);
    }
    .stat-number {
      font-size: 36px;
      font-family: var(--font-number);
      color: var(--accent);
      line-height: 1.1;
    }
    .stat-label {
      font-size: 16px;
      color: var(--text-muted);
      margin-top: 8px;
    }

    /* 板块标题 */
    .section {
      padding: 70px 0;
    }
    .section-title {
      font-size: 32px;
      font-family: var(--font-title);
      color: #0a2e1a;
      margin-bottom: 16px;
    }
    .section-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 700px;
      margin-bottom: 48px;
    }

    /* 亮点服务网格 (错落布局) */
    .services-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 24px;
      margin-bottom: 32px;
    }
    .services-grid-row2 {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
      border: 1px solid #f1f5f9;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-lg);
      border-color: var(--primary-light);
    }
    .service-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 28px;
      margin-bottom: 18px;
    }
    .service-card h3 {
      font-size: 20px;
      font-family: var(--font-title);
      margin-bottom: 10px;
    }
    .service-desc {
      color: var(--text-light);
      line-height: 1.6;
      margin-bottom: 20px;
    }
    .service-stat {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      margin-top: auto;
    }

    /* 案例瀑布流 */
    .cases-waterfall {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.2s;
      display: flex;
      flex-direction: column;
    }
    .case-card:hover {
      box-shadow: var(--shadow-lg);
    }
    .case-img {
      height: 240px;
      object-fit: cover;
    }
    .case-card:nth-child(2) .case-img { height: 180px; }
    .case-card:nth-child(3) .case-img { height: 260px; }
    .case-card-content {
      padding: 20px;
    }
    .case-tag {
      display: inline-block;
      background: var(--primary-light);
      color: var(--primary);
      font-size: 14px;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 10px;
    }
    .case-title {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .case-data {
      font-size: 18px;
      font-weight: 700;
      color: var(--accent);
    }

    /* 方案对比 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .plan-card {
      background: white;
      border-radius: var(--radius);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      border: 2px solid transparent;
    }
    .plan-card.recommended {
      border-color: var(--primary);
      background: #f6fefc;
      position: relative;
    }
    .badge-hot {
      background: var(--accent);
      color: white;
      font-size: 12px;
      padding: 4px 14px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      right: 20px;
    }
    .plan-name { font-weight: 700; font-size: 20px; }
    .plan-price { font-size: 28px; color: var(--primary); margin: 16px 0; }
    .plan-features { list-style: none; margin: 20px 0; flex:1; }
    .plan-features li { margin: 12px 0; color: var(--text-light); }
    .plan-btn { margin-top: 20px; }

    /* FAQ 手风琴双列 */
    .faq-grid {
      display: grid;
      grid-template-columns: 320px 1fr;
      gap: 48px;
      align-items: flex-start;
    }
    .faq-questions {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .faq-item {
      padding: 14px 20px;
      border-radius: 12px;
      cursor: pointer;
      font-weight: 600;
      transition: 0.2s;
      background: white;
    }
    .faq-item.active {
      background: var(--primary);
      color: white;
    }
    .faq-answer-panel {
      background: #f1f5f9;
      border-radius: 16px;
      padding: 28px;
      min-height: 180px;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #0A2E1A 0%, #056436 100%);
      color: white;
      text-align: center;
      padding: 70px 20px;
      border-radius: 32px;
      margin: 60px 0;
    }
    .cta-banner h2 {
      font-size: 40px;
      font-weight: 800;
      margin-bottom: 20px;
    }

    /* 页脚 */
    footer {
      background: #0a2e1a;
      color: rgba(255,255,255,0.8);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-logo {
      font-size: 24px;
      font-weight: 700;
      color: white;
    }

    @media (max-width: 1024px) {
      .hero { grid-template-columns: 1fr; gap: 32px; }
      .services-grid, .services-grid-row2 { grid-template-columns: 1fr 1fr; }
      .pricing-grid, .cases-waterfall { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .stats-strip { grid-template-columns: 1fr 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-content h1 { font-size: 32px; }
    }