/* roulang page: index */
:root {
      --bs-primary: #E43D2A;
      --bs-primary-rgb: 228, 61, 42;
      --bs-dark: #1E1E2C;
      --bs-dark-rgb: 30, 30, 44;
      --bs-warning: #F5A623;
      --bs-warning-rgb: 245, 166, 35;
      --bs-light-bg: #F8F9FA;
      --bs-body-color: #1A1A1A;
      --bs-text-muted: #6B7280;
      --bs-white: #FFFFFF;
      --bs-border-radius: 12px;
      --bs-border-radius-sm: 8px;
      --bs-border-radius-xs: 6px;
      --bs-shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
      --bs-shadow-hover: 0 12px 28px rgba(228,61,42,0.15);
      --bs-font-sans-serif: 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --bs-font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --bs-body-line-height: 1.7;
    }
    * { box-sizing: border-box; }
    body {
      font-family: var(--bs-font-sans-serif);
      color: var(--bs-body-color);
      background-color: var(--bs-light-bg);
      line-height: var(--bs-body-line-height);
      font-weight: 400;
    }
    h1, h2, h3, .h1, .h2, .h3 {
      font-family: var(--bs-font-heading);
      font-weight: 700;
    }
    h1 { font-size: 3rem; }
    h2 { font-size: 2.25rem; }
    h3 { font-size: 1.5rem; }
    .text-muted-custom { color: var(--bs-text-muted); }
    a { color: var(--bs-primary); text-decoration: none; }
    a:hover { color: #C5301C; }
    img { max-width: 100%; height: auto; }
    .container { max-width: 1200px; }
    section { padding: 100px 0; }
    /* 导航 */
    .navbar {
      background-color: rgba(30,30,44,0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }
    .navbar-brand {
      font-family: var(--bs-font-heading);
      font-weight: 800;
      color: var(--bs-primary) !important;
      font-size: 1.5rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .navbar-brand i { font-size: 1.8rem; color: var(--bs-warning); }
    .navbar-nav .nav-link {
      color: #4B5563 !important;
      font-weight: 500;
      margin: 0 0.5rem;
      position: relative;
      transition: color 0.2s;
    }
    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: var(--bs-primary) !important;
    }
    .navbar-nav .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--bs-primary);
      transition: width 0.25s ease;
    }
    .navbar-nav .nav-link:hover::after { width: 100%; }
    .btn-outline-primary-custom {
      border: 2px solid var(--bs-primary);
      color: var(--bs-primary);
      background: transparent;
      border-radius: var(--bs-border-radius-sm);
      padding: 0.5rem 1.5rem;
      font-weight: 600;
      transition: all 0.2s;
    }
    .btn-outline-primary-custom:hover {
      background: #FEE9E7;
      color: #C5301C;
      border-color: #C5301C;
    }
    .btn-primary-custom {
      background: var(--bs-primary);
      color: white;
      border: none;
      border-radius: var(--bs-border-radius-sm);
      padding: 0.5rem 1.8rem;
      font-weight: 700;
      box-shadow: 0 4px 10px rgba(228,61,42,0.3);
      transition: all 0.2s;
      animation: pulse 2s infinite;
    }
    .btn-primary-custom:hover {
      background: #C5301C;
      box-shadow: 0 6px 14px rgba(228,61,42,0.4);
      color: white;
      transform: translateY(-1px);
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(228,61,42,0.4); }
      70% { box-shadow: 0 0 0 8px rgba(228,61,42,0); }
      100% { box-shadow: 0 0 0 0 rgba(228,61,42,0); }
    }
    .navbar-toggler { border: none; }
    /* Hero */
    #hero {
      background: linear-gradient(135deg, #1E1E2C 0%, rgba(30,30,44,0.7) 60%, transparent 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 90vh;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
      overflow: hidden;
    }
    #hero::before {
      content: '';
      position: absolute;
      top: -50%;
      left: -50%;
      width: 200%;
      height: 200%;
      background: repeating-linear-gradient(45deg, transparent, transparent 2px, rgba(255,255,255,0.02) 2px, rgba(255,255,255,0.02) 4px);
      animation: speedLines 20s linear infinite;
    }
    @keyframes speedLines { 0% { transform: translate(0,0); } 100% { transform: translate(50px, 50px); } }
    .hero-content { position: relative; z-index: 2; }
    .hero-image {
      border-radius: var(--bs-border-radius);
      box-shadow: 0 20px 40px rgba(228,61,42,0.3);
      transform: rotate(1deg);
    }
    /* 卡片 */
    .card-custom {
      background: var(--bs-white);
      border: none;
      border-radius: var(--bs-border-radius);
      box-shadow: var(--bs-shadow-sm);
      transition: all 0.25s ease;
      height: 100%;
    }
    .card-custom:hover {
      transform: translateY(-6px);
      box-shadow: var(--bs-shadow-hover);
    }
    .service-icon {
      font-size: 2.5rem;
      color: var(--bs-warning);
      transition: transform 0.25s;
    }
    .card-custom:hover .service-icon { transform: scale(1.1); }
    .case-card {
      position: relative;
      border-radius: var(--bs-border-radius);
      overflow: hidden;
      box-shadow: var(--bs-shadow-sm);
      transition: all 0.25s ease;
      height: 100%;
    }
    .case-card:hover { transform: translateY(-6px); box-shadow: var(--bs-shadow-hover); }
    .case-img { width: 100%; height: 220px; object-fit: cover; }
    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(0,0,0,0.8));
      padding: 2rem 1.5rem;
      color: white;
    }
    .badge-custom {
      background: var(--bs-primary);
      color: white;
      border-radius: 20px;
      padding: 0.25rem 1rem;
      font-size: 0.75rem;
      font-weight: 600;
    }
    /* 优势数据 */
    .stat-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--bs-warning);
      display: block;
    }
    /* 流程 */
    .process-step {
      text-align: center;
      position: relative;
    }
    .process-icon {
      font-size: 2.5rem;
      color: var(--bs-primary);
      background: rgba(228,61,42,0.1);
      width: 80px;
      height: 80px;
      line-height: 80px;
      border-radius: 50%;
      margin: 0 auto 1rem;
    }
    /* FAQ */
    .accordion-button:not(.collapsed) {
      background: #FFF5F3;
      color: var(--bs-primary);
      box-shadow: none;
      border-left: 4px solid var(--bs-primary);
    }
    .accordion-button:focus {
      box-shadow: 0 0 0 3px rgba(228,61,42,0.2);
      border-color: var(--bs-primary);
    }
    .accordion-item {
      border: none;
      margin-bottom: 0.75rem;
      border-radius: var(--bs-border-radius-sm) !important;
      overflow: hidden;
    }
    /* CTA */
    .cta-section {
      background: var(--bs-primary);
      background-image: linear-gradient(135deg, #E43D2A 0%, #C5301C 100%);
    }
    .btn-light-custom {
      background: white;
      color: var(--bs-primary);
      font-weight: 700;
      border-radius: var(--bs-border-radius-sm);
      padding: 0.75rem 2.5rem;
      transition: all 0.2s;
    }
    .btn-light-custom:hover { background: #FEE9E7; color: #C5301C; }
    /* Footer */
    footer {
      background: var(--bs-dark);
      color: rgba(255,255,255,0.8);
    }
    .footer-logo { font-size: 1.8rem; font-weight: 800; color: var(--bs-primary); }
    .social-icon {
      width: 40px;
      height: 40px;
      background: rgba(255,255,255,0.1);
      border-radius: 50%;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      color: white;
      margin-right: 0.5rem;
      transition: all 0.2s;
    }
    .social-icon:hover { background: var(--bs-primary); color: white; }
    @media (max-width: 768px) {
      h1 { font-size: 2rem; }
      h2 { font-size: 1.75rem; }
      section { padding: 60px 0; }
      .navbar-collapse { background: rgba(30,30,44,0.98); padding: 1rem; border-radius: 12px; }
    }