/* roulang page: index */
:root {
      --primary: #0A2E1F;
      --primary-soft: #1B5E3F;
      --accent: #F5A623;
      --accent-hover: #E5940F;
      --bg: #F7F9F8;
      --card: #FFFFFF;
      --text: #1A1A1A;
      --text-secondary: #4A4A4A;
      --border-light: #DDE2E0;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --container-max: 1200px;
      --transition: 0.25s ease-in-out;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", "SF Pro Display", system-ui, sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

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

    /* 可访问性焦点 */
    a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }

    /* 导航 ------------------------------------------------------------------ */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.03);
      z-index: 1000;
      height: 64px;
      display: flex;
      align-items: center;
    }

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

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      color: var(--primary);
      font-weight: 700;
      font-size: 1.4rem;
      letter-spacing: 1px;
    }
    .logo img {
      height: 38px;
      width: auto;
      display: block;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }

    .nav-links a {
      text-decoration: none;
      color: var(--text);
      font-weight: 500;
      font-size: 0.95rem;
      transition: var(--transition);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width var(--transition);
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

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

    .btn-primary {
      background: var(--accent);
      color: #fff;
      border: none;
      padding: 10px 22px;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      cursor: pointer;
      border: 2px solid transparent;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
      box-shadow: 0 8px 18px rgba(245,166,35,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 22px;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .btn-outline:hover {
      background: rgba(10,46,31,0.06);
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
    }


    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .site-header {
        height: 60px;
      }
      .mobile-bottom-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: #fff;
        border-top: 1px solid #e2e8f0;
        justify-content: space-around;
        align-items: center;
        padding: 8px 10px;
        z-index: 999;
        box-shadow: 0 -4px 12px rgba(0,0,0,0.02);
      }
      .mobile-bottom-nav a {
        display: flex;
        flex-direction: column;
        align-items: center;
        font-size: 0.7rem;
        color: var(--text-secondary);
        text-decoration: none;
        gap: 4px;
      }
      .mobile-bottom-nav a i {
        font-size: 1.2rem;
      }
      .mobile-bottom-nav a.active {
        color: var(--accent);
      }
      .body-padding-bottom {
        padding-bottom: 72px;
      }
    }

    @media (min-width: 769px) {
      .body-padding-bottom {
        padding-bottom: 0;
      }
    }

    /* Hero ---------------------------------------------------------------- */
    .hero-section {
      background: linear-gradient(135deg, #0A2E1F 0%, #1B5E3F 100%);
      position: relative;
      overflow: hidden;
      padding: 140px 0 90px;
      color: white;
      margin-top: 64px;
    }

    .hero-bg-overlay {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/hero-bg.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.25;
      mix-blend-mode: overlay;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 40px;
    }

    .hero-text {
      flex: 1 1 480px;
    }
    .hero-text h1 {
      font-size: clamp(2.2rem, 5vw, 3.4rem);
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }
    .hero-text p {
      font-size: 1.1rem;
      max-width: 68ch;
      opacity: 0.9;
      margin-bottom: 30px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .hero-image {
      flex: 1 1 400px;
      text-align: center;
    }
    .hero-image img {
      max-width: 100%;
      height: auto;
      border-radius: var(--radius-lg);
    }

    @media (max-width: 768px) {
      .hero-section {
        padding: 100px 0 60px;
        margin-top: 60px;
      }
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero-actions {
        justify-content: center;
      }
    }

    /* 通用板块 */
    .section {
      padding: 90px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 50px;
    }
    .section-title h2 {
      font-size: 2rem;
      font-weight: 600;
      color: var(--primary);
    }

    /* 数据看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--card);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .stat-card:hover {
      transform: scale(1.03);
      box-shadow: var(--shadow-hover);
    }
    .stat-number {
      font-size: 2.4rem;
      font-weight: 800;
      color: var(--accent);
    }
    .stat-label {
      color: var(--text-secondary);
      margin-top: 6px;
    }

    @media (max-width: 768px) {
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .service-card {
      background: var(--card);
      border-radius: var(--radius-lg);
      padding: 28px 22px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-img {
      height: 160px;
      background: #f0f4f2;
      border-radius: var(--radius-md);
      margin-bottom: 20px;
      overflow: hidden;
    }
    .service-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .service-card h3 {
      font-size: 1.3rem;
      margin-bottom: 8px;
    }
    .badge-cert {
      display: inline-block;
      background: #e6f0eb;
      color: var(--primary);
      font-size: 0.75rem;
      padding: 4px 10px;
      border-radius: 20px;
      margin-top: 12px;
    }

    @media (max-width: 1023px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比区 */
    .compare-row {
      display: flex;
      gap: 24px;
      align-items: center;
      flex-wrap: wrap;
    }
    .compare-card {
      flex: 1;
      background: var(--card);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-sm);
    }
    .compare-card.before {
      border-left: 4px solid #B0BFB8;
      opacity: 0.9;
    }
    .compare-card.after {
      border-left: 4px solid var(--accent);
      background: #fefaf2;
    }
    .progress-bar {
      background: #e9ecef;
      border-radius: 4px;
      height: 8px;
      margin: 10px 0;
    }
    .progress-fill {
      background: var(--accent);
      height: 8px;
      border-radius: 4px;
      width: 78%;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      padding: 18px 10px;
      font-weight: 600;
      font-size: 1.1rem;
      text-align: left;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--text);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 10px;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }
    .faq-item.active .faq-question {
      color: var(--primary);
    }

    /* 表单 */
    .contact-form {
      background: var(--card);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .form-row {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .form-group {
      flex: 1 1 200px;
    }
    input, select {
      width: 100%;
      padding: 14px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      font-family: inherit;
      transition: 0.2s;
    }
    input:focus, select:focus {
      border-color: var(--primary);
      outline: none;
    }

    /* 页脚 */
    .footer {
      background: #061F14;
      color: #B0BFB8;
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 32px;
    }
    .footer a {
      color: #B0BFB8;
      text-decoration: none;
    }
    .footer a:hover {
      color: var(--accent);
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .compare-row {
        flex-direction: column;
      }
    }