/* roulang page: index */
:root {
      --primary-navy: #0B1120;
      --primary-blue: #0F52BA;
      --accent-indigo: #2563EB;
      --accent-purple: #6366F1;
      --accent-emerald: #10B981;
      --accent-amber: #F59E0B;
      --bg-canvas: #070B14;
      --bg-surface: #0E1626;
      --bg-card: #131E32;
      --bg-card-light: #F8FAFC;
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-active: rgba(37, 99, 235, 0.4);
      --text-main: #FFFFFF;
      --text-muted: #94A3B8;
      --text-dim: #64748B;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 22px;
      --radius-pill: 9999px;
      --shadow-ambient: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
      --shadow-hover: 0 20px 40px -10px rgba(37, 99, 235, 0.25);
      --transition-smooth: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      background-color: var(--bg-canvas);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition-smooth);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      width: 100%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    .badge {
      display: inline-flex;
      align-items: center;
      gap: 0.5rem;
      padding: 0.35rem 0.85rem;
      border-radius: var(--radius-pill);
      font-size: 0.75rem;
      font-weight: 700;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      background: rgba(37, 99, 235, 0.15);
      border: 1px solid rgba(37, 99, 235, 0.3);
      color: #60A5FA;
    }
    .badge .dot {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--accent-emerald);
      box-shadow: 0 0 8px var(--accent-emerald);
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      padding: 0.85rem 1.75rem;
      border-radius: var(--radius-pill);
      font-size: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition-smooth);
      min-height: 48px;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary-blue), var(--accent-indigo));
      color: #ffffff;
      box-shadow: 0 4px 18px rgba(37, 99, 235, 0.35);
    }
    .btn-primary:hover {
      box-shadow: 0 8px 25px rgba(37, 99, 235, 0.55);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: rgba(255, 255, 255, 0.05);
      border-color: var(--border-subtle);
      color: #E2E8F0;
    }
    .btn-secondary:hover {
      background: rgba(255, 255, 255, 0.1);
      border-color: rgba(255, 255, 255, 0.2);
      transform: translateY(-2px);
    }
    .top-bar {
      background: #050811;
      border-bottom: 1px solid var(--border-subtle);
      font-size: 0.8rem;
      color: var(--text-dim);
      padding: 0.5rem 0;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .header {
      position: sticky;
      top: 0;
      z-index: 999;
      background: rgba(11, 17, 32, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-subtle);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      font-size: 1.35rem;
      font-weight: 800;
      color: #ffffff;
    }
    .logo-symbol {
      width: 38px;
      height: 38px;
      border-radius: var(--radius-md);
      background: linear-gradient(135deg, var(--accent-indigo), var(--accent-emerald));
      display: grid;
      place-items: center;
      font-size: 1.1rem;
      box-shadow: 0 0 16px rgba(37, 99, 235, 0.4);
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      list-style: none;
    }
    .nav-links a {
      font-size: 0.95rem;
      color: var(--text-muted);
      font-weight: 500;
    }
    .nav-links a:hover {
      color: #ffffff;
    }
    .section-wrap {
      padding: 5rem 0;
      position: relative;
    }
    .section-bg-alt {
      background: var(--bg-surface);
      border-top: 1px solid var(--border-subtle);
      border-bottom: 1px solid var(--border-subtle);
    }
    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 3.5rem auto;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 800;
      margin: 0.85rem 0;
      line-height: 1.3;
      background: linear-gradient(180deg, #FFFFFF 0%, #CBD5E1 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .section-desc {
      color: var(--text-muted);
      font-size: 1rem;
      line-height: 1.7;
    }
    .bento-hero {
      padding: 4rem 0 5rem 0;
      background: radial-gradient(circle at 50% 20%, rgba(37, 99, 235, 0.15) 0%, rgba(7, 11, 20, 0) 70%),
                  url('/assets/images/0d191db21c62bb82.webp') center/cover no-repeat fixed;
      position: relative;
    }
    .bento-hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background: rgba(7, 11, 20, 0.88);
    }
    .bento-grid {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1.8fr 1.2fr;
      grid-gap: 1.75rem;
    }
    .bento-main-card {
      background: rgba(19, 30, 50, 0.7);
      border: 1px solid rgba(255, 255, 255, 0.1);
      backdrop-filter: blur(16px);
      border-radius: var(--radius-lg);
      padding: 3.5rem 3rem;
      display: flex;
      flex-direction: column;
      justify-content: center;
      box-shadow: var(--shadow-ambient);
    }
    .hero-h1 {
      font-size: 3rem;
      font-weight: 900;
      line-height: 1.2;
      margin: 1.2rem 0;
      letter-spacing: -0.02em;
    }
    .hero-summary {
      color: var(--text-muted);
      font-size: 1.125rem;
      margin-bottom: 2.25rem;
      line-height: 1.75;
    }
    .hero-action-group {
      display: flex;
      gap: 1rem;
      align-items: center;
      flex-wrap: wrap;
    }
    .bento-side-column {
      display: flex;
      flex-direction: column;
      gap: 1.75rem;
    }
    .bento-sub-card {
      background: rgba(19, 30, 50, 0.75);
      border: 1px solid rgba(255, 255, 255, 0.08);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-lg);
      padding: 2rem;
      flex: 1;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition-smooth);
    }
    .bento-sub-card:hover {
      border-color: var(--border-active);
      transform: translateY(-4px);
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 2rem;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
    }
    .glass-card {
      background: var(--bg-card);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
      padding: 2.25rem;
      transition: var(--transition-smooth);
      position: relative;
      overflow: hidden;
    }
    .glass-card:hover {
      border-color: var(--border-active);
      box-shadow: var(--shadow-hover);
      transform: translateY(-5px);
    }
    .card-icon-wrap {
      width: 52px;
      height: 52px;
      border-radius: var(--radius-md);
      background: rgba(37, 99, 235, 0.12);
      border: 1px solid rgba(37, 99, 235, 0.25);
      display: grid;
      place-items: center;
      font-size: 1.5rem;
      color: #60A5FA;
      margin-bottom: 1.5rem;
    }
    .card-title {
      font-size: 1.35rem;
      font-weight: 700;
      margin-bottom: 0.75rem;
      color: #FFFFFF;
    }
    .card-text {
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.65;
      margin-bottom: 1.25rem;
    }
    .check-list {
      list-style: none;
      margin-top: 1rem;
    }
    .check-list li {
      position: relative;
      padding-left: 1.5rem;
      font-size: 0.9rem;
      color: #CBD5E1;
      margin-bottom: 0.6rem;
    }
    .check-list li::before {
      content: "✓";
      position: absolute;
      left: 0;
      color: var(--accent-emerald);
      font-weight: bold;
    }
    .contrast-box {
      border-radius: var(--radius-lg);
      background: #060A12;
      border: 1px solid rgba(255, 255, 255, 0.05);
      padding: 2.5rem;
    }
    .contrast-head {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-bottom: 1.25rem;
      margin-bottom: 1.5rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .contrast-row {
      margin-bottom: 1.5rem;
    }
    .contrast-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      display: flex;
      justify-content: space-between;
      margin-bottom: 0.5rem;
    }
    .progress-bar-bg {
      height: 8px;
      border-radius: 4px;
      background: rgba(255, 255, 255, 0.1);
      overflow: hidden;
    }
    .progress-bar-fill {
      height: 100%;
      border-radius: 4px;
    }
    .fill-trad {
      width: 25%;
      background: #64748B;
    }
    .fill-ours {
      width: 96%;
      background: linear-gradient(90deg, var(--accent-indigo), var(--accent-emerald));
    }
    .metric-banner {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.5rem;
      text-align: center;
      padding: 3rem 2rem;
      background: linear-gradient(145deg, rgba(15, 82, 186, 0.15) 0%, rgba(14, 22, 38, 0.8) 100%);
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-lg);
    }
    .metric-val {
      font-size: 3rem;
      font-weight: 900;
      color: #60A5FA;
      font-family: inherit;
      line-height: 1.1;
      margin-bottom: 0.5rem;
    }
    .metric-tag {
      font-size: 0.9rem;
      color: var(--text-muted);
    }
    .timeline-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      position: relative;
    }
    .step-node {
      position: relative;
    }
    .step-circle {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--bg-card);
      border: 2px solid var(--accent-indigo);
      display: grid;
      place-items: center;
      font-weight: 800;
      font-size: 1.1rem;
      color: #93C5FD;
      margin-bottom: 1.25rem;
    }
    .faq-accordion {
      max-width: 820px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }
    .faq-item {
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-md);
      background: var(--bg-card);
      overflow: hidden;
      transition: var(--transition-smooth);
    }
    .faq-item:hover {
      border-color: rgba(37, 99, 235, 0.3);
    }
    .faq-summary {
      padding: 1.25rem 1.75rem;
      font-size: 1.1rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      color: #FFFFFF;
      list-style: none;
    }
    .faq-summary::-webkit-details-marker {
      display: none;
    }
    .faq-summary::after {
      content: "+";
      font-size: 1.5rem;
      color: #60A5FA;
      transition: var(--transition-smooth);
    }
    details[open] .faq-summary::after {
      transform: rotate(45deg);
    }
    .faq-body {
      padding: 0 1.75rem 1.5rem 1.75rem;
      color: var(--text-muted);
      line-height: 1.75;
      font-size: 0.95rem;
    }
    .form-box {
      background: rgba(19, 30, 50, 0.85);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--radius-lg);
      padding: 3rem;
      box-shadow: var(--shadow-ambient);
    }
    .form-group {
      margin-bottom: 1.25rem;
    }
    .form-label {
      display: block;
      font-size: 0.85rem;
      font-weight: 600;
      color: #CBD5E1;
      margin-bottom: 0.5rem;
    }
    .form-input, .form-select {
      width: 100%;
      padding: 0.85rem 1.2rem;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.12);
      background: rgba(7, 11, 20, 0.6);
      color: #FFFFFF;
      font-size: 0.95rem;
      outline: none;
      transition: var(--transition-smooth);
    }
    .form-input:focus, .form-select:focus {
      border-color: var(--accent-indigo);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.25);
    }
    .footer {
      background: #04060C;
      border-top: 1px solid var(--border-subtle);
      padding: 4.5rem 0 2rem 0;
      font-size: 0.9rem;
      color: var(--text-dim);
    }
    .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: 0.75rem;
    }
    .footer-col ul a:hover {
      color: #60A5FA;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 2rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 1rem;
    }
    @media (max-width: 1024px) {
      .bento-grid {
        grid-template-columns: 1fr;
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .timeline-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hero-h1 {
        font-size: 2.25rem;
      }
      .grid-2, .grid-3, .grid-4, .metric-banner, .timeline-steps {
        grid-template-columns: 1fr;
      }
      .bento-main-card {
        padding: 2rem 1.5rem;
      }
      .form-box {
        padding: 2rem 1.5rem;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }