/* roulang page: index */
:root {
      --primary: #0A4D3C;
      --primary-light: rgba(10, 77, 60, 0.08);
      --accent: #F4A261;
      --accent-hover: #e08e3a;
      --cta: #E76F51;
      --cta-hover: #d25f42;
      --success: #2A9D8F;
      --bg: #FAFAF7;
      --text: #1E1E1E;
      --text-muted: #5C5C5C;
      --card-bg: #FFFFFF;
      --border: #E8E5DF;
      --shadow-card: 0 4px 24px rgba(0,0,0,0.04), 0 1px 4px rgba(0,0,0,0.03);
      --shadow-card-hover: 0 12px 32px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
      --shadow-btn: 0 2px 8px rgba(10,77,60,0.25);
      --radius-card: 20px;
      --radius-sm: 16px;
      --radius-btn: 12px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
      --font-number: "Inter", "SF Pro Display", system-ui, sans-serif;
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      color: var(--text);
    }
    h1 {
      font-size: 48px;
      line-height: 1.15;
      font-weight: 700;
    }
    h2 {
      font-size: 36px;
      line-height: 1.2;
      font-weight: 700;
    }
    h3 {
      font-size: 22px;
      line-height: 1.35;
      font-weight: 600;
    }
    h4 {
      font-size: 18px;
      line-height: 1.4;
      font-weight: 600;
    }
    .text-muted-custom {
      color: var(--text-muted);
    }
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航卡片 */
    .navbar-custom {
      background: var(--card-bg);
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-card);
      padding: 12px 24px;
      margin: 20px auto 0;
      max-width: 1100px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: var(--transition);
    }
    .nav-logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }
    .nav-logo i {
      font-size: 28px;
      color: var(--accent);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
    }
    .nav-item {
      background: transparent;
      border: none;
      color: var(--text);
      padding: 10px 18px;
      border-radius: 40px;
      font-weight: 500;
      display: flex;
      align-items: center;
      gap: 6px;
      cursor: pointer;
      transition: var(--transition);
      font-size: 15px;
      white-space: nowrap;
      text-decoration: none;
    }
    .nav-item i {
      font-size: 18px;
      color: var(--primary);
    }
    .nav-item:hover {
      background: var(--primary-light);
      color: var(--primary);
    }
    .btn-primary-custom {
      background: var(--primary);
      border: none;
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      box-shadow: var(--shadow-btn);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 16px;
      text-decoration: none;
    }
    .btn-primary-custom:hover {
      background: var(--cta);
      box-shadow: 0 6px 16px rgba(231,111,81,0.4);
      color: white;
    }
    .btn-outline-custom {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      text-decoration: none;
    }
    .btn-outline-custom:hover {
      background: var(--primary-light);
      color: var(--primary);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--primary);
    }
    /* 移动端导航面板 */
    .mobile-panel {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, #0A4D3C 0%, #0D3B2E 100%);
      z-index: 1050;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 24px;
      transform: translateY(-100%);
      transition: transform 0.3s ease;
    }
    .mobile-panel.active {
      transform: translateY(0);
    }
    .mobile-panel .nav-item {
      color: white;
      background: rgba(255,255,255,0.1);
      width: 200px;
      justify-content: center;
      font-size: 20px;
    }
    .mobile-close {
      position: absolute;
      top: 24px;
      right: 24px;
      background: none;
      border: none;
      color: white;
      font-size: 32px;
    }
    section {
      padding: 100px 0;
    }
    .hero-bg {
      background: linear-gradient(180deg, #FAFAF7 0%, #F0EDE6 100%);
    }
    .data-float-card {
      background: var(--card-bg);
      border-radius: 24px;
      padding: 32px;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .metric-badge {
      background: var(--card-bg);
      border-radius: var(--radius-sm);
      padding: 24px 20px;
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: var(--transition);
    }
    .metric-number {
      font-family: var(--font-number);
      font-size: 40px;
      font-weight: 800;
      color: var(--primary);
    }
    .trend-up {
      color: var(--success);
      font-weight: 600;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }
    .compare-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      position: relative;
    }
    .recommend-badge {
      background: var(--accent);
      color: white;
      padding: 6px 18px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 14px;
      display: inline-block;
      margin-bottom: 16px;
    }
    .faq-item {
      background: var(--card-bg);
      border-bottom: 1px solid var(--border);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 16px;
    }
    .contact-section {
      background: linear-gradient(135deg, #0A4D3C 0%, #0D3B2E 100%);
      color: white;
    }
    .footer-dark {
      background: #1E1E1E;
      color: #B0B0B0;
    }
    @media (max-width: 992px) {
      h1 { font-size: 38px; }
      h2 { font-size: 30px; }
      .nav-menu { display: none; }
      .hamburger { display: block; }
      .navbar-custom { padding: 12px 20px; }
    }
    @media (max-width: 768px) {
      section { padding: 70px 0; }
      .container-custom { padding: 0 20px; }
    }