/* roulang page: index */
:root {
      --primary: #1A5FDC;
      --primary-dark: #0F3D8C;
      --accent: #F9A826;
      --bg-light: #F8FAFD;
      --card-bg: #FFFFFF;
      --text-primary: #1E293B;
      --text-secondary: #64748B;
      --border-light: #E2E8F0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(26,95,220,0.08);
      --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);
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.8;
      margin: 0;
      padding-top: 80px;
    }
    
    h1, h2, h3, h4, h5, h6 {
      font-weight: 600;
      line-height: 1.4;
      color: var(--text-primary);
    }
    
    h1 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
    }
    
    h2 {
      font-size: 28px;
      font-weight: 600;
    }
    
    h3 {
      font-size: 20px;
      font-weight: 600;
    }
    
    p {
      font-size: 16px;
      color: var(--text-secondary);
      margin-bottom: 1.2rem;
    }
    
    .text-small {
      font-size: 14px;
      color: var(--text-secondary);
    }
    
    a {
      text-decoration: none;
      color: var(--primary);
      transition: var(--transition);
    }
    
    a:hover {
      color: var(--primary-dark);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    .btn {
      font-weight: 600;
      font-size: 16px;
      letter-spacing: 0.5px;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      transition: all 0.2s ease;
      border: none;
    }
    
    .btn-primary-custom {
      background-color: var(--primary);
      color: white;
      border: 1px solid var(--primary);
    }
    
    .btn-primary-custom:hover {
      background-color: var(--primary-dark);
      border-color: var(--primary-dark);
      color: white;
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(26,95,220,0.25);
    }
    
    .btn-outline-primary-custom {
      background: transparent;
      color: var(--primary);
      border: 1px solid var(--primary);
    }
    
    .btn-outline-primary-custom:hover {
      background-color: #EBF2FD;
      color: var(--primary-dark);
      border-color: var(--primary-dark);
    }
    
    .btn-accent {
      background-color: var(--accent);
      color: #1E293B;
      border: none;
      font-weight: 700;
    }
    
    .btn-accent:hover {
      background-color: #e8970f;
      color: #0f172a;
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(249,168,38,0.3);
    }
    
    .section-padding {
      padding: 80px 0;
    }
    
    .card-custom {
      background: var(--card-bg);
      border: none;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      padding: 32px;
      transition: all var(--transition);
      height: 100%;
    }
    
    .card-custom:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    
    .icon-circle {
      width: 48px;
      height: 48px;
      background-color: rgba(26,95,220,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 24px;
      margin-bottom: 20px;
    }
    
    .accent-text {
      color: var(--accent);
      font-weight: 700;
    }
    
    .bg-primary-soft {
      background-color: #EBF2FD;
    }
    
    .navbar-custom {
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 var(--border-light);
      padding: 0.8rem 0;
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 1030;
      transition: box-shadow 0.2s ease;
    }
    
    .navbar-custom.scrolled {
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
    }
    
    .navbar-brand-custom {
      font-weight: 700;
      font-size: 22px;
      color: var(--primary-dark) !important;
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
    }
    
    .navbar-brand-custom i {
      color: var(--accent);
      margin-right: 8px;
      font-size: 26px;
    }
    
    .nav-link-custom {
      color: var(--text-primary) !important;
      font-weight: 500;
      margin: 0 4px;
      padding: 8px 12px !important;
      border-radius: 6px;
      transition: var(--transition);
    }
    
    .nav-link-custom:hover {
      background-color: rgba(26,95,220,0.05);
      color: var(--primary) !important;
    }
    
    .search-box {
      position: relative;
      width: 35%;
    }
    
    .search-box input {
      width: 100%;
      height: 44px;
      border-radius: 24px;
      border: 1px solid var(--border-light);
      background: white;
      padding: 0 20px 0 44px;
      font-size: 14px;
      color: var(--text-primary);
      transition: all 0.2s ease;
      outline: none;
    }
    
    .search-box input::placeholder {
      color: #94A3B8;
      font-weight: 400;
    }
    
    .search-box input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(26,95,220,0.1);
    }
    
    .search-box i {
      position: absolute;
      left: 18px;
      top: 50%;
      transform: translateY(-50%);
      color: #94A3B8;
      font-size: 16px;
    }
    
    .hero-section {
      background: linear-gradient(135deg, #F8FAFD 0%, #EBF2FD 100%);
      padding-top: 60px;
      padding-bottom: 80px;
    }
    
    .hero-image-container {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 20px;
      min-height: 350px;
      box-shadow: 0 20px 35px rgba(0,0,0,0.08);
      width: 100%;
      background-blend-mode: overlay;
      background-color: rgba(26,95,220,0.02);
    }
    
    .stat-number {
      font-size: 32px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }
    
    .accordion-button:not(.collapsed) {
      background-color: white;
      color: var(--primary);
      box-shadow: none;
      border-bottom: 1px solid var(--border-light);
    }
    
    .accordion-button:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 2px rgba(26,95,220,0.15);
    }
    
    .accordion-item {
      border: none;
      border-bottom: 1px solid var(--border-light);
      background: transparent;
      margin-bottom: 8px;
      border-radius: 8px !important;
      overflow: hidden;
      box-shadow: 0 1px 4px rgba(0,0,0,0.02);
    }
    
    .footer-custom {
      background-color: #1E293B;
      color: #CBD5E1;
      padding: 60px 0 30px;
    }
    
    .footer-custom a {
      color: #CBD5E1;
      text-decoration: none;
      transition: var(--transition);
    }
    
    .footer-custom a:hover {
      color: white;
      text-decoration: underline;
    }
    
    .footer-custom h5 {
      color: white;
      font-weight: 600;
      margin-bottom: 20px;
    }
    
    @media (max-width: 991.98px) {
      .navbar-collapse {
        background: white;
        padding: 20px;
        border-radius: 16px;
        box-shadow: 0 10px 25px rgba(0,0,0,0.08);
        margin-top: 10px;
      }
      .search-box {
        width: 100%;
        margin: 10px 0;
      }
      h1 {
        font-size: 28px;
      }
      h2 {
        font-size: 22px;
      }
      .card-custom {
        padding: 24px;
      }
      .hero-section {
        padding-top: 30px;
      }
    }
    
    @media (max-width: 767.98px) {
      .hero-image-container {
        min-height: 250px;
        margin-top: 30px;
      }
    }