/* roulang page: index */
:root {
      --green: #16A34A;
      --green-dark: #15803D;
      --blue-accent: #0EA5E9;
      --bg-light: #F2F7F2;
      --bg-white: #FFFFFF;
      --text-primary: #1E293B;
      --text-secondary: #64748B;
      --border-light: #e2e8f0;
      --shadow-card: 0 4px 16px rgba(0,0,0,0.04), 0 1px 4px rgba(0,0,0,0.02);
      --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --max-width: 1280px;
      --transition: all 0.25s ease;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }

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

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

    button, input, textarea {
      font-family: inherit;
    }

    /* ---- 导航 PC 端 ---- */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 8px rgba(0,0,0,0.03);
      z-index: 1000;
      height: 68px;
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--green-dark);
    }

    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--green);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><circle cx="12" cy="12" r="10" fill="white"/><path d="M8 12h8M12 8v8" stroke="green" stroke-width="3"/></svg>') center/contain no-repeat;
      background-color: var(--green);
      border-radius: 50%;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      font-weight: 500;
      color: var(--text-secondary);
    }

    .nav-links a {
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
      font-size: 0.95rem;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--green);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--green);
      transform: scaleX(0);
      transition: transform 0.2s ease;
      border-radius: 3px;
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      transform: scaleX(1);
    }

    /* 移动端底部导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 16px;
      right: 16px;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(20px);
      border-radius: 32px;
      box-shadow: 0 8px 24px rgba(0,0,0,0.12);
      padding: 8px 16px;
      z-index: 1001;
      justify-content: space-around;
      align-items: center;
      border: 1px solid rgba(22,163,74,0.2);
    }

    .mobile-nav a {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 11px;
      color: var(--text-secondary);
      gap: 4px;
      transition: var(--transition);
      padding: 6px 0;
    }

    .mobile-nav a.active {
      color: white;
      background: var(--green);
      border-radius: 24px;
      padding: 6px 14px;
    }

    .mobile-nav .nav-icon {
      font-size: 18px;
    }

    /* 板块共用 */
    section {
      padding: 64px 0;
      scroll-margin-top: 90px;
    }

    h2 {
      font-size: 2.15rem;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--text-primary);
    }

    .section-desc {
      color: var(--text-secondary);
      margin-bottom: 32px;
      font-size: 1rem;
    }

    /* 按钮 */
    .btn-primary {
      background: var(--green);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: var(--transition);
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: var(--green-dark);
      transform: scale(1.02);
      box-shadow: 0 6px 18px rgba(22,163,74,0.3);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--green);
      color: var(--green);
      padding: 12px 28px;
      border-radius: var(--btn-radius);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: var(--green);
      color: white;
    }

    .text-link {
      color: var(--blue-accent);
      font-weight: 500;
      transition: 0.2s;
    }
    .text-link:hover {
      text-decoration: underline;
    }

    /* Hero */
    #hero {
      position: relative;
      min-height: 80vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, rgba(22,163,74,0.08) 0%, rgba(255,255,255,0.91) 65%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 400px;
    }
    .hero-text h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.2;
      color: #0f172a;
    }
    .hero-sub {
      margin: 22px 0 28px;
      color: var(--text-secondary);
      font-size: 1.15rem;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-data-card {
      background: white;
      border-radius: 24px;
      padding: 24px 28px;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      gap: 12px;
      min-width: 200px;
    }
    .live-badge {
      background: #dc2626;
      color: white;
      padding: 2px 10px;
      border-radius: 50px;
      font-size: 0.7rem;
      display: inline-block;
      width: fit-content;
    }

    /* 数据看板 */
    .kpi-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .kpi-card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .kpi-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-card-hover);
    }
    .kpi-number {
      font-family: 'DIN Alternate', 'PingFang SC', sans-serif;
      font-weight: 700;
      font-size: 2.7rem;
      color: #0f172a;
    }
    .trend-up {
      color: var(--green);
      font-weight: 600;
      font-size: 0.95rem;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-card-hover);
    }
    .service-img {
      height: 160px;
      background-size: cover;
      background-position: center;
    }
    .service-content {
      padding: 24px;
    }

    /* 对比表 */
    .compare-table {
      display: flex;
      border-radius: var(--radius-card);
      overflow-x: auto;
      background: white;
    }
    .col {
      flex: 1;
      min-width: 180px;
      padding: 24px;
    }
    .col-center {
      background: #F0FDF4;
      font-weight: 600;
    }
    .col-header {
      font-weight: 700;
      font-size: 1.2rem;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 16px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.03);
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: white;
    }
    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    .faq-item.open .faq-question {
      background: #f0fdf4;
    }

    /* CTA区域 */
    .cta-dark {
      background: #0F172A;
      border-radius: 24px;
      padding: 54px;
      display: flex;
      gap: 48px;
      flex-wrap: wrap;
      justify-content: space-between;
      color: white;
    }
    .cta-form input, .cta-form textarea {
      width: 100%;
      padding: 14px;
      border-radius: var(--radius-btn);
      border: none;
      margin-bottom: 16px;
      background: white;
    }

    footer {
      background: white;
      padding: 56px 0 28px;
      margin-top: 32px;
    }

    @media (max-width: 1023px) {
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .kpi-grid { grid-template-columns: repeat(2,1fr); }
      #hero { min-height: auto; padding: 100px 0 40px; }
    }
    @media (max-width: 767px) {
      .main-header { display: none; }
      .mobile-nav { display: flex; }
      .services-grid, .kpi-grid { grid-template-columns: 1fr; }
      h1 { font-size: 2.4rem !important; }
      .cta-dark { flex-direction: column; padding: 28px; }
      .hero-grid { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; }
    }
    .footer-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; }
    @media (min-width: 768px) { .mobile-nav { display: none; } }