* { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
            background: #ffffff;
            color: #334155;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }
        .container {
            text-align: center;
            max-width: 740px;
            padding: 2rem;
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }
        .logo {
            width: 100%;
            max-width: 520px;
            height: auto;
            display: block;
            margin-bottom: 2.5rem;
        }
        .tagline {
            font-size: 1.2rem;
            color: #46667D;
            margin-bottom: 1rem;
            line-height: 1.5;
            font-weight: 500;
        }
        .subtitle {
            font-size: 1.05rem;
            color: #64748b;
            line-height: 1.6;
            margin-bottom: 2.5rem;
        }
        .layers {
            display: grid;
            grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
            column-gap: 3rem;
            text-align: left;
            margin-bottom: 2.5rem;
            width: 100%;
            max-width: 600px;
        }
        .layer-column {
            display: flex;
            flex-direction: column;
            gap: 2rem;
        }
        .layer-group h3 {
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: #1677A6;
            margin-bottom: 0.6rem;
        }
        .layer-group ul {
            list-style: none;
            padding: 0;
        }
        .layer-group li {
            font-size: 0.92rem;
            color: #64748b;
            padding: 0.25rem 0;
            line-height: 1.4;
        }
        .badge {
            display: inline-block;
            background: #f0fdfa;
            border: 1px solid #99f6e4;
            border-radius: 9999px;
            padding: 0.5rem 1.5rem;
            font-size: 0.875rem;
            font-weight: 600;
            color: #0f766e;
            text-decoration: none;
            transition: background 0.2s, border-color 0.2s;
        }
        .badge:hover {
            background: #ccfbf1;
            border-color: #5eead4;
        }
        .badge:focus-visible,
        footer a:focus-visible {
            outline: 3px solid #1677A6;
            outline-offset: 3px;
        }
        .actions {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 0.75rem;
        }
        .badge.primary {
            background: #1677A6;
            border-color: #1677A6;
            color: #ffffff;
        }
        .badge.primary:hover {
            background: #125f87;
            border-color: #125f87;
        }
        .coverage {
            font-size: 0.85rem;
            color: #52677d;
            margin-top: 2rem;
        }
        .footnote {
            font-size: 0.8rem;
            color: #52677d;
            margin-top: 0.5rem;
            font-style: italic;
        }
        footer {
            padding: 1.5rem;
            font-size: 0.8rem;
            color: #52677d;
        }
        footer a { color: #0f668f; }
        @media (max-width: 520px) {
            .layers { grid-template-columns: 1fr; gap: 1.5rem; }
            .layer-column { gap: 1.5rem; }
        }