/* roulang page: index */
:root {
      --primary: #1A2B4C;
      --secondary: #C5A86C;
      --bg-light: #F8F6F2;
      --accent: #D44C2F;
      --text-primary: #1A2B4C;
      --text-body: #3E3E3E;
      --text-muted: #7A7A7A;
      --border-color: #E5E0D8;
      --card-shadow: 0 2px 12px rgba(26, 43, 76, 0.06);
      --card-shadow-hover: 0 8px 24px rgba(26, 43, 76, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-container: 16px;
      --transition: 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      line-height: 1.7;
      color: var(--text-body);
      background-color: #ffffff;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4, h5, h6 {
      font-weight: 600;
      color: var(--text-primary);
      letter-spacing: -0.3px;
      margin-bottom: 0.75rem;
    }
    h1 { font-size: 48px; line-height: 1.2; font-weight: 700; letter-spacing: -0.5px; }
    h2 { font-size: 36px; line-height: 1.3; }
    h3 { font-size: 24px; line-height: 1.4; font-weight: 500; }
    h4 { font-size: 20px; line-height: 1.4; font-weight: 600; }
    .text-lg { font-size: 16px; line-height: 1.7; }
    .text-sm { font-size: 14px; line-height: 1.5; color: var(--text-muted); }
    .metric-number { font-size: 56px; line-height: 1.1; font-weight: 800; color: var(--primary); position: relative; display: inline-block; }
    .metric-number::after { content: ''; position: absolute; bottom: -6px; left: 0; width: 100%; height: 3px; background: var(--secondary); border-radius: 2px; }
    a { color: var(--primary); text-decoration: none; transition: var(--transition); }
    a:hover { text-decoration: underline; text-underline-offset: 3px; }
    img { max-width: 100%; height: auto; display: block; }
    .container { max-width: 1200px; padding-left: 20px; padding-right: 20px; }
    section { padding: 100px 0; }
    @media (max-width: 768px) { section { padding: 60px 0; } }

    /* 导航栏 */
    .navbar-custom {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 6px rgba(0,0,0,0.04);
      padding: 12px 0;
      transition: var(--transition);
    }
    .navbar-brand {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary) !important;
      letter-spacing: 2px;
      position: absolute;
      left: 50%;
      transform: translateX(-50%);
      white-space: nowrap;
    }
    .navbar-brand img { height: 32px; margin-right: 8px; display: inline-block; vertical-align: middle; }
    .navbar-nav .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-body) !important;
      margin: 0 10px;
      padding: 8px 4px !important;
      transition: var(--transition);
      border-bottom: 2px solid transparent;
    }
    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: var(--secondary) !important;
      border-bottom-color: var(--secondary);
    }
    .navbar-toggler { border: none; padding: 4px 8px; }
    .navbar-toggler:focus { box-shadow: none; }
    @media (max-width: 991px) {
      .navbar-brand { position: static; transform: none; margin-right: auto; }
      .navbar-collapse { background: white; padding: 20px; border-radius: var(--radius-card); box-shadow: var(--card-shadow); margin-top: 12px; }
      .navbar-nav .nav-link { margin: 10px 0; border-bottom: none; }
    }

    /* Hero */
    .hero-section {
      min-height: 100vh;
      background: linear-gradient(rgba(26, 43, 76, 0.68), rgba(26, 43, 76, 0.7)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
      overflow: hidden;
    }
    .hero-content { position: relative; z-index: 2; text-align: center; max-width: 800px; margin: 0 auto; }
    .hero-content h1 { color: white; text-shadow: 0 4px 14px rgba(0,0,0,0.3); }
    .hero-content h3 { color: rgba(255,255,255,0.92); font-weight: 400; margin-bottom: 32px; }
    .btn-primary-custom {
      background: var(--accent); color: white; font-weight: 600; padding: 14px 36px; border-radius: var(--radius-btn);
      border: none; transition: 0.25s; font-size: 16px; box-shadow: 0 4px 10px rgba(212, 76, 47, 0.3);
    }
    .btn-primary-custom:hover { background: #B33A24; transform: translateY(-2px); color: white; }
    .btn-outline-light-custom {
      background: transparent; border: 2px solid white; color: white; font-weight: 600; padding: 14px 36px;
      border-radius: var(--radius-btn); transition: 0.25s; font-size: 16px;
    }
    .btn-outline-light-custom:hover { background: white; color: var(--primary); }
    .hero-decoration {
      position: absolute; top: 0; left: 0; width: 100%; height: 100%;
      background: radial-gradient(circle at 30% 40%, rgba(255,255,255,0.08) 1px, transparent 1px);
      background-size: 60px 60px; z-index: 1; pointer-events: none;
    }

    /* 数据看板 */
    .stat-card {
      text-align: center; padding: 32px 16px; background: transparent; border: none;
      position: relative;
    }
    .stat-divider { width: 1px; background: var(--border-color); height: 60px; align-self: center; }
    @media (max-width: 767px) {
      .stat-divider { display: none; }
      .stat-card { padding: 20px; }
    }

    /* 服务体系卡片 */
    .service-card {
      background: white; border-radius: var(--radius-card); padding: 32px;
      box-shadow: var(--card-shadow); transition: 0.25s; border: 1px solid var(--border-color);
      display: flex; flex-direction: column; height: 100%;
    }
    .service-card:hover {
      transform: translateY(-6px); box-shadow: var(--card-shadow-hover); border-color: var(--secondary);
    }
    .service-icon {
      width: 64px; height: 64px; background: #F0EFEA; border-radius: 12px; display: flex;
      align-items: center; justify-content: center; margin-bottom: 20px; transition: 0.2s;
    }
    .service-card:hover .service-icon { background: #E8EDF5; }
    .service-icon img { width: 40px; height: 40px; object-fit: contain; }
    .service-link { margin-top: auto; font-weight: 600; color: var(--primary); display: inline-flex; align-items: center; }
    .service-link i { margin-left: 6px; transition: 0.2s; }
    .service-link:hover { color: var(--accent); }
    .service-grid {
      display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
    }
    @media (max-width: 991px) { .service-grid { grid-template-columns: 1fr 1fr; } }
    @media (max-width: 600px) { .service-grid { grid-template-columns: 1fr; } }

    /* 对比区域 */
    .compare-item { display: flex; align-items: flex-start; margin-bottom: 28px; }
    .compare-icon { width: 28px; font-size: 20px; margin-right: 12px; }
    .compare-badge { font-weight: 600; margin-right: 8px; min-width: 85px; }
    .advantage-img {
      border-radius: var(--radius-container); box-shadow: var(--card-shadow); object-fit: cover; width: 100%; height: auto;
    }

    /* FAQ */
    .accordion-button {
      background: var(--bg-light); font-weight: 600; font-size: 18px; color: var(--primary);
      padding: 20px 24px; border: none; box-shadow: none; transition: 0.3s;
    }
    .accordion-button:not(.collapsed) {
      background: #E8EDF5; color: var(--primary); box-shadow: none;
    }
    .accordion-button::after { transition: transform 0.3s; }
    .accordion-item { border: none; margin-bottom: 8px; background: transparent; }
    .accordion-body { background: white; padding: 20px 24px; color: var(--text-body); font-size: 16px; }

    /* CTA 表单区块 */
    .cta-section {
      background: var(--primary); position: relative; overflow: hidden;
      background-image: radial-gradient(circle at 20% 30%, rgba(197,168,108,0.15) 1px, transparent 1px);
      background-size: 40px 40px;
    }
    .form-control-underline {
      background: transparent; border: none; border-bottom: 2px solid rgba(255,255,255,0.5);
      border-radius: 0; padding: 12px 4px; color: white; transition: 0.2s;
    }
    .form-control-underline:focus {
      border-bottom-color: var(--secondary); box-shadow: none; background: transparent; color: white;
    }
    .form-control-underline::placeholder { color: rgba(255,255,255,0.65); }
    .btn-gold {
      background: var(--secondary); color: var(--primary); font-weight: 700; padding: 14px 36px;
      border-radius: var(--radius-btn); border: none; transition: 0.25s;
    }
    .btn-gold:hover { background: #D4BC8A; transform: translateY(-2px); }

    /* Footer */
    .footer-links a {
      color: var(--secondary); text-decoration: none; display: block; margin-bottom: 8px; font-size: 15px;
    }
    .footer-links a:hover { text-decoration: underline; }
    .qr-placeholder {
      width: 140px; height: 140px; background: #F0EFEA; border-radius: 12px; display: flex; align-items: center; justify-content: center;
      filter: grayscale(0.4); transition: 0.3s;
    }
    .qr-placeholder:hover { filter: grayscale(0); }
    .copyright-bar {
      background: #0E1A2E; color: var(--secondary); font-size: 14px; padding: 20px 0;
    }

    @media (max-width: 768px) {
      h1 { font-size: 32px; } h2 { font-size: 26px; } 
      .metric-number { font-size: 44px; }
      .hero-content { padding: 20px; }
    }