/* roulang page: index */
:root {
      --primary: #0A4C6B;
      --primary-light: rgba(10, 76, 107, 0.08);
      --secondary: #00A896;
      --secondary-hover: #008B7A;
      --accent: #F5A623;
      --bg: #F8FAFB;
      --card-bg: #FFFFFF;
      --text: #2C3E50;
      --text-light: #7F8C8D;
      --border-light: #E0E6E9;
      --footer-bg: #1A2B33;
      --footer-text: #B0C4CC;
      --shadow-sm: 0 2px 16px rgba(10, 76, 107, 0.08);
      --shadow-hover: 0 6px 24px rgba(10, 76, 107, 0.14);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-heading: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
      --font-metric: 'DIN Alternate', 'Noto Sans SC', sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--bg);
      color: var(--text);
      margin: 0;
      padding-top: 72px;
      padding-bottom: 56px;
      line-height: 1.8;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    @media (min-width: 992px) {
      body {
        padding-bottom: 0;
      }
    }
    h1, h2, h3, h4, .metric-number {
      font-family: var(--font-heading);
      font-weight: 700;
      color: var(--text);
      letter-spacing: 0.5px;
    }
    h1 {
      font-size: 38px;
      line-height: 1.3;
    }
    h2 {
      font-size: 30px;
      margin-bottom: 1rem;
    }
    h3 {
      font-size: 22px;
    }
    @media (max-width: 768px) {
      h1 {
        font-size: 28px;
      }
      h2 {
        font-size: 24px;
      }
      h3 {
        font-size: 20px;
      }
    }
    .container {
      max-width: 1140px;
    }
    /* 导航覆盖 Bootstrap */
    .navbar {
      background: #fff;
      box-shadow: 0 1px 0 var(--border-light);
      height: 72px;
      padding: 0 1rem;
    }
    .navbar-brand {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--primary) !important;
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      letter-spacing: 1px;
    }
    .navbar-brand svg {
      width: 28px;
      height: 28px;
      fill: var(--secondary);
    }
    .nav-link {
      color: var(--text) !important;
      font-weight: 500;
      margin: 0 0.2rem;
      padding: 0.5rem 1rem !important;
      border-radius: 6px;
      transition: 0.2s ease;
      position: relative;
    }
    .nav-link:hover {
      color: var(--secondary) !important;
      background: rgba(0,168,150,0.05);
    }
    .nav-link.active {
      color: var(--secondary) !important;
      font-weight: 700;
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 8px;
      left: 50%;
      transform: translateX(-50%);
      width: 24px;
      height: 2px;
      background: var(--secondary);
      border-radius: 2px;
    }
    @media (max-width: 991px) {
      .navbar-collapse {
        background: white;
        padding: 1rem;
        border-radius: 0 0 16px 16px;
        box-shadow: var(--shadow-sm);
        margin-top: 8px;
      }
    }
    /* 移动底部导航 */
    .mobile-bottom-nav {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      height: 56px;
      background: #fff;
      display: flex;
      justify-content: space-around;
      align-items: center;
      box-shadow: 0 -2px 10px rgba(0,0,0,0.04);
      z-index: 1030;
      border-top: 1px solid #eee;
    }
    @media (min-width: 992px) {
      .mobile-bottom-nav {
        display: none;
      }
    }
    .mobile-tab {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-light);
      font-size: 11px;
      text-decoration: none;
      font-weight: 500;
      transition: 0.2s;
      padding: 4px 0;
    }
    .mobile-tab i {
      font-size: 20px;
      margin-bottom: 2px;
      color: var(--text);
    }
    .mobile-tab.active {
      color: var(--secondary);
    }
    .mobile-tab.active i {
      color: var(--secondary);
    }
    .mobile-tab.active::after {
      content: '';
      width: 6px;
      height: 6px;
      background: var(--secondary);
      border-radius: 50%;
      margin-top: 2px;
    }
    /* Hero */
    #hero {
      background: linear-gradient(135deg, #F8FAFB 0%, #E8F4F8 100%);
      padding: 5rem 0;
      position: relative;
      overflow: hidden;
      min-height: 85vh;
      display: flex;
      align-items: center;
    }
    .hero-decor {
      position: absolute;
      right: 0;
      top: 0;
      width: 50%;
      height: 100%;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 600" opacity="0.1"><path d="M200 50 Q 280 150 200 300 T 100 500" stroke="%230A4C6B" fill="none" stroke-width="2"/><circle cx="180" cy="110" r="4" fill="%230A4C6B"/></svg>') no-repeat;
      background-size: contain;
      pointer-events: none;
    }
    .glass-card {
      background: rgba(255,255,255,0.7);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-card);
      padding: 1.5rem;
      box-shadow: var(--shadow-sm);
      border: 1px solid rgba(255,255,255,0.8);
    }
    .metric-large {
      font-family: var(--font-metric);
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--secondary);
      line-height: 1.2;
    }
    /* 按钮覆盖 */
    .btn-primary-custom {
      background: var(--secondary);
      border: none;
      color: white;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.2s ease;
    }
    .btn-primary-custom:hover {
      background: var(--secondary-hover);
      transform: scale(1.02);
      color: white;
      box-shadow: var(--shadow-hover);
    }
    .btn-outline-custom {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 0.7rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.2s;
    }
    .btn-outline-custom:hover {
      background: var(--primary-light);
      border-color: var(--primary);
      color: var(--primary);
      transform: scale(1.02);
    }
    .btn-accent {
      background: var(--accent);
      color: #fff;
      border: none;
      font-weight: 700;
      transition: 0.2s;
    }
    .btn-accent:hover {
      background: #e59400;
      color: white;
    }
    /* 卡片系统 */
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      border-top: 3px solid transparent;
      height: 100%;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-top-color: var(--secondary);
    }
    .icon-placeholder {
      width: 64px;
      height: 64px;
      background: #f0f6f9;
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.5rem;
      color: var(--primary);
    }
    .comparison-card {
      border-radius: var(--radius-card);
      padding: 2rem;
      background: #fff;
      box-shadow: var(--shadow-sm);
    }
    .accordion-button:not(.collapsed) {
      background: transparent;
      color: var(--secondary);
      box-shadow: none;
      font-weight: 700;
      border-left: 4px solid var(--secondary);
    }
    .accordion-button {
      font-weight: 600;
      color: var(--text);
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-btn) !important;
      margin-bottom: 8px;
    }
    .accordion-item {
      border: none;
      margin-bottom: 12px;
    }
    .footer a {
      color: var(--footer-text);
      text-decoration: none;
      transition: 0.2s;
    }
    .footer a:hover {
      color: white;
    }
    input, textarea {
      border-radius: var(--radius-input) !important;
      border: 1px solid #ddd;
      padding: 0.75rem;
      width: 100%;
    }
    input:focus, textarea:focus {
      border-color: var(--secondary);
      box-shadow: 0 0 0 0.2rem rgba(0,168,150,0.15);
    }
    section {
      padding: 80px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 50px 0;
      }
    }
    .footer {
      background: var(--footer-bg);
      color: var(--footer-text);
      padding: 3rem 0 1.5rem;
    }