/* roulang page: index */
:root {
      --primary: #0A6E5C;
      --primary-hover: #085B4B;
      --accent: #F4A261;
      --accent-hover: #e08c45;
      --bg: #FAFAF8;
      --card-bg: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-mid: #4A4A4A;
      --text-light: #6B6B6B;
      --border: #E8E8E6;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-img: 8px;
      --shadow-card: 0 4px 12px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 12px 24px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.06);
      --shadow-btn: 0 2px 4px rgba(10,110,92,0.2);
      --transition: 0.3s ease;
      --nav-height: 64px;
      --section-padding: 80px;
    }

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

    body {
      font-family: 'Noto Sans SC', 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
      background-color: var(--bg);
      color: var(--text-mid);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--nav-height);
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      padding: 0 24px;
      height: 100%;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
      white-space: nowrap;
    }
    .logo i {
      font-size: 28px;
      color: var(--accent);
    }

    .nav-tabs {
      display: flex;
      align-items: center;
      gap: 6px;
      background: transparent;
    }

    .nav-chip {
      padding: 8px 18px;
      border-radius: 40px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-mid);
      background: transparent;
      transition: var(--transition);
      white-space: nowrap;
    }

    .nav-chip:hover,
    .nav-chip.active {
      background: var(--primary);
      color: white;
    }

    .nav-cta {
      background: var(--primary);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      box-shadow: var(--shadow-btn);
      white-space: nowrap;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .nav-cta:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
      box-shadow: 0 6px 14px rgba(10,110,92,0.25);
    }

    .hamburger {
      display: none;
      font-size: 26px;
      color: var(--text-dark);
      cursor: pointer;
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-tabs, .nav-cta-desktop {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        box-shadow: 0 12px 24px rgba(0,0,0,0.08);
        display: none;
        z-index: 999;
      }
      .mobile-menu.open {
        display: flex;
      }
      .mobile-menu .nav-chip {
        display: block;
        text-align: center;
        font-size: 18px;
        padding: 12px;
      }
      .mobile-menu .nav-cta {
        justify-content: center;
        margin-top: 8px;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, rgba(10,110,92,0.85) 0%, rgba(10,110,92,0.4) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      color: white;
      margin-top: var(--nav-height);
      padding: 40px 0;
    }

    .hero-content {
      max-width: 700px;
    }

    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: white;
      margin-bottom: 20px;
    }

    .hero p {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
      max-width: 600px;
    }

    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      box-shadow: 0 4px 10px rgba(244,162,97,0.3);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-outline:hover {
      background: white;
      color: var(--primary);
    }

    /* 通用板块 */
    section {
      padding: var(--section-padding) 0;
    }

    .section-title {
      font-size: 28px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      color: var(--text-light);
      text-align: center;
      max-width: 700px;
      margin: 0 auto 48px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .card-icon {
      font-size: 32px;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 24px;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 40px;
    }
    .stat-item h3 {
      font-size: 36px;
      color: var(--primary);
      font-weight: 700;
    }

    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .faq-item {
      border: 1px solid var(--border);
      border-radius: var(--radius-btn);
      margin-bottom: 12px;
      background: var(--card-bg);
    }
    .faq-question {
      padding: 16px 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #FAFAF8;
    }
    .faq-answer {
      padding: 0 20px 20px;
      display: none;
      color: var(--text-mid);
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    .cta-banner {
      background: var(--primary);
      text-align: center;
      padding: 60px 24px;
      border-radius: var(--radius-card);
      color: white;
    }

    footer {
      background: #1A1A1A;
      color: #B0B0B0;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
      gap: 32px;
    }

    @media (max-width: 992px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: repeat(2,1fr); }
      .hero h1 { font-size: 38px; }
    }
    @media (max-width: 768px) {
      .grid-3, .testimonial-grid { grid-template-columns: 1fr; }
      .stats-grid { flex-direction: column; text-align: center; }
      .hero { text-align: center; }
      .hero-buttons { justify-content: center; }
    }
    @media (max-width: 576px) {
      .footer-grid { grid-template-columns: 1fr; }
      .hero h1 { font-size: 30px; }
      section { padding: 40px 0; }
    }