/* roulang page: index */
:root {
      --primary-deep: #1E2A38;
      --accent-orange: #F15A24;
      --accent-orange-hover: #D94A1A;
      --bg-white: #FFFFFF;
      --bg-ice: #F8F9FA;
      --text-body: #4A5568;
      --text-muted: #A0AEC0;
      --border-light: #E2E8F0;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.02);
      --shadow-hover: 0 12px 24px rgba(0,0,0,0.08), 0 2px 6px rgba(0,0,0,0.04);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      --transition-smooth: 0.25s ease;
      --section-padding: 7rem 0;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      color: var(--text-body);
      background: var(--bg-white);
      line-height: 1.6;
      font-size: 1rem;
      -webkit-font-smoothing: antialiased;
    }

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

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

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }

    /* 导航 */
    .main-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: var(--bg-white);
      border-bottom: 1px solid var(--border-light);
      transition: box-shadow var(--transition-smooth);
    }

    .main-header.scrolled {
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0.8rem 1.5rem;
      max-width: 1200px;
      margin: 0 auto;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary-deep);
      letter-spacing: 0.5px;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--primary-deep);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.4rem;
      position: relative;
    }

    .logo-icon::before {
      content: "🐼";
      font-size: 1.2rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-links a {
      color: var(--primary-deep);
      font-weight: 500;
      transition: color var(--transition-smooth);
      font-size: 0.95rem;
    }

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

    .btn-primary {
      background: var(--accent-orange);
      color: white;
      padding: 0.7rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background var(--transition-smooth), box-shadow var(--transition-smooth);
      border: none;
      cursor: pointer;
      display: inline-block;
      text-align: center;
      box-shadow: 0 2px 8px rgba(241,90,36,0.2);
    }

    .btn-primary:hover {
      background: var(--accent-orange-hover);
      box-shadow: 0 6px 16px rgba(241,90,36,0.3);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--accent-orange);
      color: var(--accent-orange);
      padding: 0.65rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all var(--transition-smooth);
    }

    .btn-secondary:hover {
      background: rgba(241,90,36,0.08);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }

    .hamburger span {
      width: 25px;
      height: 2.5px;
      background: var(--primary-deep);
      transition: var(--transition-smooth);
    }

    @media (max-width: 768px) {
      .hamburger {
        display: flex;
      }
      .nav-links {
        position: absolute;
        top: 65px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        border-bottom: 1px solid var(--border-light);
        transform: translateY(-150%);
        opacity: 0;
        transition: all 0.3s ease;
        pointer-events: none;
      }
      .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
      }
    }

    /* Hero */
    .hero {
      background: url('/assets/images/backpic/hero-bg.webp') center/cover no-repeat;
      min-height: 90vh;
      display: flex;
      align-items: center;
      position: relative;
      color: white;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(30,42,56,0.85) 0%, rgba(30,42,56,0.4) 70%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      padding: 2rem 0;
    }

    .hero h1 {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      color: white;
    }

    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 2.5rem;
    }

    .hero-buttons {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2.2rem;
      }
      .hero {
        min-height: 80vh;
      }
    }

    /* 通用区块 */
    .section {
      padding: var(--section-padding);
    }

    .section-ice {
      background: var(--bg-ice);
    }

    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 1rem;
      letter-spacing: -0.5px;
    }

    .section-desc {
      color: var(--text-muted);
      max-width: 650px;
      margin-bottom: 3rem;
      font-size: 1.1rem;
    }

    /* 服务矩阵 非对称网格 */
    .services-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.9fr 1.1fr;
      gap: 1.5rem;
    }

    .service-card {
      background: white;
      padding: 2rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: all var(--transition-smooth);
      display: flex;
      flex-direction: column;
    }

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

    .service-icon {
      font-size: 2rem;
      color: var(--accent-orange);
      margin-bottom: 1.5rem;
    }

    .service-card h3 {
      font-size: 1.5rem;
      color: var(--primary-deep);
      margin-bottom: 0.8rem;
    }

    @media (max-width: 992px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 数据看板 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
      margin-bottom: 4rem;
    }

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

    .stat-label {
      color: var(--text-muted);
      font-weight: 500;
    }

    .comparison-box {
      display: flex;
      gap: 2rem;
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      flex-wrap: wrap;
    }

    .comparison-col {
      flex: 1;
      min-width: 250px;
    }

    .comparison-col h4 {
      font-size: 1.3rem;
      margin-bottom: 1rem;
    }

    .highlight-bg {
      background: #FFF3EC;
      padding: 1.2rem;
      border-radius: 10px;
    }

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

    /* FAQ */
    .faq-item {
      border: 1px solid var(--border-light);
      border-radius: 10px;
      margin-bottom: 1rem;
      background: white;
      transition: all var(--transition-smooth);
    }

    .faq-question {
      padding: 1.2rem 1.5rem;
      font-weight: 700;
      color: var(--primary-deep);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      padding: 0 1.5rem 1.5rem;
      color: var(--text-body);
      display: none;
    }

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

    .faq-item.active {
      border-left: 4px solid var(--accent-orange);
    }

    /* 表单 */
    .contact-wrapper {
      display: flex;
      gap: 3rem;
      align-items: flex-start;
      flex-wrap: wrap;
    }

    .contact-form {
      flex: 2;
      background: var(--bg-ice);
      padding: 2.5rem;
      border-radius: var(--radius-card);
    }

    .contact-info {
      flex: 1;
    }

    .form-group {
      margin-bottom: 1.5rem;
    }

    .form-group input, .form-group textarea {
      width: 100%;
      padding: 0.9rem 1rem;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-btn);
      background: white;
      transition: border 0.2s, box-shadow 0.2s;
    }

    .form-group input:focus, .form-group textarea:focus {
      outline: none;
      border-color: var(--accent-orange);
      box-shadow: 0 0 0 3px rgba(241,90,36,0.15);
    }

    /* 页脚 */
    .footer {
      background: var(--primary-deep);
      color: rgba(255,255,255,0.75);
      padding: 3rem 0 1.5rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 2rem;
      margin-bottom: 2rem;
    }

    .footer a {
      color: rgba(255,255,255,0.8);
      transition: color 0.2s;
    }

    .footer a:hover {
      color: white;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.15);
      padding-top: 1.5rem;
      text-align: center;
      font-size: 0.9rem;
    }

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