/* roulang page: index */
:root {
      --primary: #1E40AF;
      --primary-hover: #1E3A8A;
      --accent: #0EA5E9;
      --accent-hover: #0284C7;
      --bg-base: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-dark: #0B132B;
      --bg-dark-card: #1C2541;
      --text-main: #111827;
      --text-muted: #4B5563;
      --text-light: #94A3B8;
      --border-color: #E2E8F0;
      --border-dark: #334155;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
      --radius: 10px;
    }
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s ease, opacity 0.2s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      width: 100%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }
    .section-py {
      padding-top: 5rem;
      padding-bottom: 5rem;
    }
    .text-center {
      text-align: center;
    }
    .text-primary {
      color: var(--primary);
    }
    .text-accent {
      color: var(--accent);
    }
    .badge {
      display: inline-block;
      padding: 0.35rem 0.85rem;
      font-size: 0.825rem;
      font-weight: 600;
      color: var(--primary);
      background-color: #DBEAFE;
      border-radius: 9999px;
      margin-bottom: 0.75rem;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 1rem;
      line-height: 1.25;
    }
    .section-desc {
      font-size: 1.0625rem;
      color: var(--text-muted);
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
      margin-bottom: 3.5rem;
    }
    .card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      box-shadow: var(--shadow-md);
      transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
      overflow: hidden;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #CBD5E1;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      padding: 0.75rem 1.75rem;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: 8px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .btn-primary {
      background-color: var(--primary);
      color: #FFFFFF;
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: scale(1.02);
    }
    .btn-accent {
      background-color: var(--accent);
      color: #FFFFFF;
    }
    .btn-accent:hover {
      background-color: var(--accent-hover);
      transform: scale(1.02);
    }
    .btn-outline {
      background-color: transparent;
      border-color: var(--border-color);
      color: var(--text-main);
    }
    .btn-outline:hover {
      background-color: #F1F5F9;
      border-color: #CBD5E1;
    }

    /* Dual-Row Header */
    .top-header {
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.875rem;
      color: var(--text-muted);
      padding: 0.75rem 0;
    }
    .top-header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 1rem;
    }
    .brand-logo-text {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.025em;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .brand-logo-icon {
      width: 28px;
      height: 28px;
      background: var(--primary);
      color: #fff;
      border-radius: 6px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 0.9rem;
    }
    .top-meta-group {
      display: flex;
      align-items: center;
      gap: 1.5rem;
    }
    .top-meta-item {
      display: flex;
      align-items: center;
      gap: 0.35rem;
    }
    .nav-bar {
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 50;
      backdrop-filter: blur(8px);
      background-color: rgba(255, 255, 255, 0.95);
    }
    .nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 64px;
    }
    .nav-links {
      display: flex;
      gap: 1.75rem;
      list-style: none;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-muted);
      padding: 0.5rem 0;
      position: relative;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a.active::after, .nav-links a:hover::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 1rem;
    }

    /* Hero Section */
    .hero-section {
      position: relative;
      background: linear-gradient(180deg, #FFFFFF 0%, #EFF6FF 100%);
      padding: 5rem 0 6rem 0;
      border-bottom: 1px solid var(--border-color);
      overflow: hidden;
    }
    .hero-bg-overlay {
      position: absolute;
      top: 0;
      right: 0;
      bottom: 0;
      width: 50%;
      opacity: 0.08;
      background-image: url('/assets/images/a868121b0f1354e2.png');
      background-size: cover;
      background-position: center;
      pointer-events: none;
    }
    .hero-content {
      max-width: 860px;
      margin: 0 auto;
      text-align: center;
      position: relative;
      z-index: 10;
    }
    .hero-h1 {
      font-size: 3rem;
      font-weight: 800;
      letter-spacing: -0.03em;
      line-height: 1.2;
      color: var(--text-main);
      margin-bottom: 1.5rem;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.75;
      margin-bottom: 2.25rem;
      text-align: justify;
      text-align-last: center;
    }
    .hero-search-box {
      max-width: 680px;
      margin: 0 auto 2rem auto;
      display: flex;
      background: #FFFFFF;
      border: 2px solid #BFDBFE;
      border-radius: 12px;
      padding: 0.35rem 0.5rem;
      box-shadow: 0 10px 25px -5px rgba(30, 64, 175, 0.1);
    }
    .hero-search-input {
      flex: 1;
      border: none;
      outline: none;
      padding: 0.85rem 1rem;
      font-size: 1rem;
      color: var(--text-main);
      background: transparent;
    }
    .hero-search-input::placeholder {
      color: #94A3B8;
    }
    .hero-hot-tags {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      align-items: center;
      gap: 0.65rem;
      font-size: 0.875rem;
      color: var(--text-muted);
    }
    .hot-tag {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 0.25rem 0.75rem;
      border-radius: 6px;
      font-size: 0.8125rem;
      transition: all 0.2s;
    }
    .hot-tag:hover {
      border-color: var(--accent);
      color: var(--accent);
    }

    /* Grid Layouts */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 2rem;
      align-items: center;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 2rem;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, minmax(0, 1fr));
      gap: 1.5rem;
    }

    /* Track / Horizontal Rail */
    .rail-container {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
    }
    .rail-card {
      background: #FFFFFF;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 1.5rem;
      position: relative;
    }
    .rail-icon {
      width: 48px;
      height: 48px;
      border-radius: 8px;
      background: #EFF6FF;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.25rem;
      font-size: 1.25rem;
      font-weight: bold;
    }

    /* Step Process */
    .step-track {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
      position: relative;
    }
    .step-item {
      background: #FFFFFF;
      padding: 2rem 1.5rem;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      position: relative;
    }
    .step-number {
      font-size: 2rem;
      font-weight: 800;
      color: #BFDBFE;
      line-height: 1;
      margin-bottom: 0.75rem;
    }

    /* Dark Showcase Section */
    .dark-showcase {
      background-color: var(--bg-dark);
      color: #FFFFFF;
      position: relative;
      overflow: hidden;
    }
    .dark-showcase .section-title {
      color: #FFFFFF;
    }
    .dark-showcase .section-desc {
      color: #94A3B8;
    }
    .metric-badge {
      font-size: 3rem;
      font-weight: 800;
      color: var(--accent);
      line-height: 1.1;
      margin-bottom: 0.5rem;
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    }

    /* Price / Product Cards */
    .product-card {
      display: flex;
      flex-direction: column;
      height: 100%;
      padding: 2.25rem 2rem;
      border-top: 4px solid var(--primary);
    }
    .product-card.featured {
      border-top-color: var(--accent);
      box-shadow: 0 12px 30px -5px rgba(14, 165, 233, 0.2);
    }
    .product-features {
      list-style: none;
      margin: 1.75rem 0;
      flex: 1;
    }
    .product-features li {
      padding: 0.6rem 0;
      border-bottom: 1px dashed #E2E8F0;
      font-size: 0.95rem;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .product-features li::before {
      content: "✓";
      color: var(--primary);
      font-weight: bold;
    }

    /* Stat Bar */
    .stat-banner {
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 3rem 0;
    }

    /* FAQ List */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 1.25rem;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 1.5rem 1.75rem;
    }
    .faq-q {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 0.5rem;
    }
    .faq-a {
      font-size: 0.975rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* Footer */
    footer {
      background: #0F172A;
      color: #94A3B8;
      font-size: 0.9rem;
      padding-top: 4.5rem;
      padding-bottom: 2.5rem;
      border-top: 1px solid #1E293B;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 3rem;
      margin-bottom: 3.5rem;
    }
    .footer-col h4 {
      color: #FFFFFF;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 1.25rem;
    }
    .footer-col ul {
      list-style: none;
    }
    .footer-col ul li {
      margin-bottom: 0.65rem;
    }
    .footer-col ul li a:hover {
      color: #FFFFFF;
    }
    .footer-bottom {
      border-top: 1px solid #1E293B;
      padding-top: 2rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 1rem;
      font-size: 0.85rem;
    }

    /* Responsive */
    @media (max-width: 1024px) {
      .grid-4, .step-track, .rail-container {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .hero-h1 {
        font-size: 2.15rem;
      }
      .section-title {
        font-size: 1.75rem;
      }
      .grid-3, .grid-2, .grid-4, .step-track, .rail-container {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .top-meta-group {
        display: none;
      }
    }