/* roulang page: index */
:root {
      --primary: #0A4C7B;
      --primary-hover: #083b5e;
      --accent: #00B4A6;
      --accent-hover: #009A8E;
      --bg-light: #F7F9FC;
      --bg-white: #FFFFFF;
      --bg-alt: #F0F4F8;
      --text-dark: #1A1A1A;
      --text-mid: #4A4A4A;
      --text-light: #6B7280;
      --border-light: #E5E7EB;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-sans);
      line-height: 1.6;
      color: var(--text-dark);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    button {
      cursor: pointer;
      font-family: inherit;
    }
    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: #FFFFFF;
      box-shadow: 0 1px 0 rgba(0,0,0,0.06);
      z-index: 50;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .logo {
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--accent);
      font-size: 1.75rem;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-dark);
      font-size: 1rem;
      transition: color 0.2s;
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background 0.2s, transform 0.2s;
      border: none;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid white;
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.2s;
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary);
      border-color: white;
    }
    .btn-secondary {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.2s;
    }
    .btn-secondary:hover {
      background: var(--primary);
      color: white;
    }
    .hamburger {
      display: none;
      font-size: 1.5rem;
      background: none;
      border: none;
      color: var(--text-dark);
    }
    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      margin-top: 0;
      padding-top: 80px;
      padding-bottom: 80px;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(10,76,123,0.85) 0%, rgba(0,0,0,0.4) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      max-width: 800px;
      color: white;
      padding: 0 20px;
    }
    h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1rem;
    }
    .hero-sub {
      font-size: 1.15rem;
      margin-bottom: 2rem;
      opacity: 0.9;
    }
    .btn-group {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
    }
    /* 通用板块 */
    section {
      padding: 80px 0;
    }
    h2 {
      font-size: 2rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 1rem;
      color: var(--text-dark);
      text-align: center;
    }
    .section-sub {
      color: var(--text-light);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 3rem;
    }
    /* 卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      transition: box-shadow 0.2s, border 0.2s;
      border: 1px solid transparent;
      text-align: left;
    }
    .card:hover {
      box-shadow: var(--shadow-card-hover);
      border-color: var(--accent);
    }
    .card-icon {
      font-size: 2rem;
      color: var(--accent);
      margin-bottom: 1rem;
    }
    .card h3 {
      font-size: 1.3rem;
      font-weight: 600;
      margin-bottom: 0.5rem;
      color: var(--text-dark);
    }
    .card p {
      color: var(--text-mid);
      font-size: 0.95rem;
      line-height: 1.5;
    }
    .card-img {
      width: 64px;
      height: 64px;
      object-fit: cover;
      border-radius: 12px;
      margin-bottom: 1rem;
    }
    /* 数据区 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 30px;
      background: var(--bg-alt);
      border-radius: 20px;
      padding: 40px 20px;
    }
    .stat-value {
      font-size: 3rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
    }
    .stat-label {
      color: var(--text-light);
      font-size: 1rem;
      margin-top: 0.25rem;
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 16px;
      align-items: flex-start;
    }
    .avatar {
      width: 48px;
      height: 48px;
      background: var(--bg-alt);
      border-radius: 50%;
      flex-shrink: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-weight: bold;
    }
    .quote {
      font-style: italic;
      color: var(--text-mid);
      margin-bottom: 0.5rem;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      font-size: 1.1rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-dark);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-mid);
      margin-top: 0;
      padding-right: 20px;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    .faq-toggle {
      font-size: 1.2rem;
      color: var(--accent);
    }
    /* CTA 底部 */
    .cta-section {
      background: var(--primary);
      color: white;
      text-align: center;
    }
    .cta-section h2 {
      color: white;
    }
    .footer {
      background: #1A1A1A;
      color: #cccccc;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    .footer h4 {
      color: white;
      margin-bottom: 1rem;
    }
    .footer a {
      color: #cccccc;
      display: block;
      margin-bottom: 0.5rem;
    }
    .copyright {
      border-top: 1px solid #333;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 0.9rem;
    }
    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .mobile-menu {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background: white;
        box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        flex-direction: column;
        padding: 20px;
      }
      .mobile-menu.open { display: flex; }
      .grid-3, .testimonial-grid { grid-template-columns: 1fr; }
      .stats-grid { flex-direction: column; }
      .hero h1 { font-size: 2rem; }
      .btn-group { flex-direction: column; align-items: center; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      section { padding: 48px 0; }
    }