/* roulang page: index */
:root {
      --primary: #E63946;
      --primary-dark: #C1121F;
      --secondary: #1D1D1D;
      --accent: #F4A261;
      --accent-hover: #e0893f;
      --bg-light: #FAFAFA;
      --white: #FFFFFF;
      --card-shadow: 0 4px 12px rgba(0,0,0,0.06);
      --card-shadow-hover: 0 8px 24px rgba(0,0,0,0.12);
      --border-radius: 12px;
      --btn-radius: 30px;
      --text-muted: #6c757d;
      --glass-bg: rgba(255,255,255,0.15);
      --glass-border: rgba(255,255,255,0.2);
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: #212529;
      line-height: 1.7;
      margin: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, .nav-link, .btn {
      font-weight: 700;
    }
    h1 {
      font-size: 2.8rem;
      font-weight: 800;
    }
    h2 {
      font-size: 2rem;
      font-weight: 700;
    }
    h3 {
      font-size: 1.5rem;
      font-weight: 600;
    }
    .section-padding {
      padding: 80px 0;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      transition: color 0.2s;
    }
    /* 导航栏 */
    .navbar {
      backdrop-filter: blur(10px);
      background-color: rgba(29,29,29,0.85);
      transition: background-color 0.3s ease, box-shadow 0.3s ease;
      padding: 0.8rem 0;
      box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    }
    .navbar.scrolled {
      background-color: rgba(29,29,29,0.98);
    }
    .navbar-brand {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--white) !important;
      letter-spacing: 1px;
    }
    .navbar-brand span {
      color: var(--primary);
    }
    .nav-link {
      color: rgba(255,255,255,0.75) !important;
      font-weight: 500;
      margin: 0 0.5rem;
      transition: color 0.2s;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary) !important;
    }
    .btn-nav-cta {
      background-color: var(--primary);
      color: var(--white);
      border-radius: var(--btn-radius);
      padding: 0.6rem 1.8rem;
      font-weight: 700;
      border: none;
      transition: 0.2s ease;
    }
    .btn-nav-cta:hover {
      background-color: var(--primary-dark);
      color: var(--white);
      transform: translateY(-2px);
    }
    .navbar-toggler {
      border-color: rgba(255,255,255,0.5);
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      color: var(--white);
    }
    .hero-overlay {
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: linear-gradient(to bottom, rgba(29,29,29,0.75) 0%, rgba(29,29,29,0.4) 60%, rgba(29,29,29,0.85) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      width: 100%;
      padding: 2rem 0;
    }
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(10px);
      border: 1px solid var(--glass-border);
      border-radius: var(--border-radius);
      padding: 1.5rem;
      color: white;
      text-align: center;
    }
    .metric-number {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--accent);
    }
    .btn-primary-custom {
      background-color: var(--primary);
      border: none;
      color: white;
      font-weight: 700;
      border-radius: var(--btn-radius);
      padding: 0.8rem 2.2rem;
      transition: 0.2s ease;
    }
    .btn-primary-custom:hover {
      background-color: var(--primary-dark);
      transform: translateY(-2px);
      color: white;
    }
    .btn-outline-custom {
      border: 2px solid var(--primary);
      background: transparent;
      color: var(--primary);
      font-weight: 700;
      border-radius: var(--btn-radius);
      padding: 0.7rem 2rem;
      transition: 0.2s;
    }
    .btn-outline-custom:hover {
      background-color: var(--primary);
      color: white;
    }
    /* 卡片通用 */
    .card-custom {
      background: var(--white);
      border: none;
      border-radius: var(--border-radius);
      box-shadow: var(--card-shadow);
      transition: 0.2s ease;
      height: 100%;
    }
    .card-custom:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-4px);
    }
    .service-img {
      height: 200px;
      object-fit: cover;
      border-radius: var(--border-radius) var(--border-radius) 0 0;
      transition: transform 0.3s;
    }
    .card-custom:hover .service-img {
      transform: scale(1.03);
    }
    /* 数据对比条 */
    .compare-bar {
      height: 12px;
      border-radius: 20px;
      margin: 0.5rem 0;
    }
    .bar-gray {
      background: #dee2e6;
    }
    .bar-red {
      background: var(--primary);
    }
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background-color: #ffe5e7;
      color: var(--primary-dark);
      font-weight: 700;
      box-shadow: none;
    }
    .accordion-button:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 0.2rem rgba(230,57,70,0.2);
    }
    /* CTA深色区 */
    .cta-dark {
      background-color: var(--secondary);
      color: white;
    }
    .form-control {
      border-radius: 30px;
      padding: 0.7rem 1.2rem;
      border: 1px solid #ced4da;
    }
    .btn-accent {
      background-color: var(--accent);
      color: #1D1D1D;
      font-weight: 700;
      border-radius: 30px;
      padding: 0.7rem 2rem;
      border: none;
      transition: 0.2s;
    }
    .btn-accent:hover {
      background-color: var(--accent-hover);
      color: #000;
    }
    footer {
      background: #111;
      color: #ccc;
    }
    footer a {
      color: #aaa;
    }
    footer a:hover {
      color: var(--primary);
    }
    @media (max-width: 768px) {
      h1 {
        font-size: 2rem;
      }
      h2 {
        font-size: 1.6rem;
      }
      .hero {
        min-height: 90vh;
      }
      .navbar-collapse {
        background: rgba(29,29,29,0.95);
        padding: 1rem;
        border-radius: 8px;
      }
    }