/* roulang page: index */
:root {
      --primary: #0A1F3F;
      --secondary: #E8451E;
      --primary-light: #1A3A5C;
      --secondary-light: #FF6B3D;
      --bg-light: #F7F8FA;
      --white: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-muted: #5A5A5A;
      --border: #E0E4E8;
      --success: #10B981;
      --radius-card: 16px;
      --radius-btn: 30px;
      --radius-badge: 20px;
      --radius-input: 8px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --transition: all 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-dark);
      margin: 0;
      line-height: 1.7;
      padding-top: 70px;
    }
    h1, h2, h3, h4, h5, h6 {
      font-weight: 700;
      margin-bottom: 0.75rem;
    }
    a {
      text-decoration: none;
      color: var(--primary);
      transition: var(--transition);
    }
    a:hover {
      color: var(--secondary);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .btn {
      border-radius: var(--radius-btn);
      padding: 0.6rem 2rem;
      font-weight: 600;
      transition: var(--transition);
      border: 2px solid transparent;
    }
    .btn-primary-custom {
      background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-light) 100%);
      border: none;
      color: var(--white);
      box-shadow: 0 4px 12px rgba(232,69,30,0.3);
    }
    .btn-primary-custom:hover {
      background: linear-gradient(135deg, #c93a1a 0%, #e85d2a 100%);
      transform: scale(1.05);
      color: var(--white);
      box-shadow: 0 8px 20px rgba(232,69,30,0.4);
    }
    .btn-outline-primary-custom {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
    }
    .btn-outline-primary-custom:hover {
      background: var(--primary);
      color: var(--white);
      border-color: var(--primary);
    }
    .btn-outline-light-custom {
      border: 2px solid rgba(255,255,255,0.8);
      color: white;
      background: transparent;
    }
    .btn-outline-light-custom:hover {
      background: white;
      color: var(--primary);
      border-color: white;
    }
    .section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 1rem;
      color: var(--primary);
    }
    .section-subtitle {
      color: var(--text-muted);
      font-size: 1.15rem;
      max-width: 700px;
      margin: 0 auto 2.5rem;
    }
    .text-muted-custom {
      color: var(--text-muted);
    }
    .badge-custom {
      background: var(--secondary);
      color: white;
      border-radius: 20px;
      padding: 0.25rem 0.9rem;
      font-size: 0.8rem;
      font-weight: 600;
    }
    .data-number {
      font-size: 2rem;
      font-weight: 800;
      color: var(--secondary);
      line-height: 1.2;
    }
    .navbar-custom {
      background: var(--white);
      box-shadow: 0 2px 10px rgba(0,0,0,0.04);
      height: 70px;
      z-index: 1030;
    }
    .navbar-brand {
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--primary) !important;
      letter-spacing: -0.3px;
    }
    .nav-link {
      color: var(--text-muted) !important;
      font-weight: 500;
      margin: 0 0.5rem;
      transition: var(--transition);
      font-size: 0.95rem;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--secondary) !important;
      border-bottom: 2px solid var(--secondary);
    }
    .search-icon {
      color: var(--text-muted);
      font-size: 1.2rem;
      cursor: pointer;
      transition: var(--transition);
      margin-right: 1rem;
    }
    .search-icon:hover {
      color: var(--secondary);
    }
    .login-link {
      color: var(--text-muted);
      font-weight: 500;
      margin-right: 1rem;
      font-size: 0.95rem;
    }
    .hero-image {
      border-radius: 20px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 380px;
    }
    .hero-overlay {
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: linear-gradient(135deg, rgba(10,31,63,0.75) 0%, rgba(232,69,30,0.25) 100%);
    }
    .feature-large-card {
      background: rgba(10,31,63,0.04);
      border-radius: var(--radius-card);
      padding: 2rem;
      height: 100%;
    }
    .card-custom {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 1.8rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border: none;
      height: 100%;
    }
    .card-custom:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background: rgba(10,31,63,0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 1.5rem;
      margin-bottom: 1.2rem;
    }
    .masonry-card {
      break-inside: avoid;
      margin-bottom: 24px;
      border-radius: var(--radius-card);
      background: white;
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: var(--transition);
    }
    .masonry-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .masonry-img {
      width: 100%;
      display: block;
      object-fit: cover;
    }
    .masonry-body {
      padding: 1.2rem;
    }
    .tag {
      background: #f0f2f5;
      color: var(--text-muted);
      border-radius: 20px;
      padding: 0.15rem 0.8rem;
      font-size: 0.75rem;
      font-weight: 600;
      margin-right: 0.5rem;
    }
    .table-comparison {
      border-collapse: separate;
      border-spacing: 0;
      width: 100%;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .table-comparison th {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
      color: white;
      font-weight: 600;
      padding: 1rem;
      vertical-align: middle;
    }
    .table-comparison td, .table-comparison th {
      padding: 0.9rem 1.2rem;
      border-bottom: 1px solid var(--border);
    }
    .table-comparison tr:last-child td {
      border-bottom: none;
    }
    .accordion-button:not(.collapsed) {
      background-color: white;
      color: var(--secondary);
      box-shadow: none;
      border-left: 4px solid var(--secondary);
    }
    .accordion-button {
      font-weight: 600;
      border-radius: 12px !important;
      box-shadow: none;
      background: white;
    }
    .accordion-item {
      border: none;
      margin-bottom: 12px;
      border-radius: 12px;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }
    .cta-banner {
      background: linear-gradient(135deg, #0A1F3F 0%, #1A3A5C 100%);
      position: relative;
      overflow: hidden;
    }
    .cta-banner::before {
      content: "";
      position: absolute;
      top: -100px;
      right: -100px;
      width: 350px;
      height: 350px;
      background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
      border-radius: 50%;
    }
    .footer {
      background: #0A1F3F;
      color: #B0BEC5;
    }
    .footer a {
      color: #B0BEC5;
    }
    .footer a:hover {
      color: white;
    }
    .footer .social-icon {
      display: inline-flex;
      width: 38px;
      height: 38px;
      background: rgba(255,255,255,0.1);
      border-radius: 50%;
      align-items: center;
      justify-content: center;
      margin-right: 0.5rem;
      transition: var(--transition);
    }
    .footer .social-icon:hover {
      background: var(--secondary);
      color: white;
    }
    .copyright {
      background: #06152A;
      color: #64748B;
    }
    @media (max-width: 992px) {
      .section { padding: 60px 0; }
      .navbar-collapse { background: white; padding: 1rem; border-radius: 12px; box-shadow: var(--shadow-card); }
    }
    @media (max-width: 768px) {
      .section-title { font-size: 1.8rem; }
      .btn { padding: 0.5rem 1.5rem; }
      .masonry-container { column-count: 1; }
    }
    .masonry-container {
      column-count: 3;
      column-gap: 24px;
    }
    @media (max-width: 992px) {
      .masonry-container { column-count: 2; }
    }
    .first-highlight {
      border-left: 4px solid var(--secondary);
    }