:root{--brand:#0369a1;--brand-deep:#03567a;--brand-tint:#e8f3fa;--bg:#fff;--bg-alt:#f8fafc;--fg:#0f172a;--fg-soft:#475569;--fg-muted:#64748b;--border:#e2e8f0;--border-strong:#cbd5e1;--danger:#dc2626;--warn:#b45309;--success:#047857;--radius:8px;--shadow-sm:0 1px 2px #0f172a0f;--shadow-md:0 4px 12px #0f172a14;--max-w:1100px;--font-stack:ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--mono:ui-monospace, SFMono-Regular, "SF Mono", Consolas, monospace}*{box-sizing:border-box}html,body{background:var(--bg);color:var(--fg);font-family:var(--font-stack);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;margin:0;padding:0;font-size:16px;line-height:1.5}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3{color:var(--fg);margin:0;line-height:1.2}h1{letter-spacing:-.02em;font-size:2.5rem;font-weight:700}h2{letter-spacing:-.01em;font-size:1.65rem;font-weight:600}h3{font-size:1.15rem;font-weight:600}p{margin:0}button{font-family:inherit;font-size:inherit;cursor:pointer}input{font-family:inherit}code,kbd{font-family:var(--mono);background:var(--bg-alt);border-radius:4px;padding:.1em .35em;font-size:.9em}.site-shell{flex-direction:column;min-height:100vh;display:flex}.site-main{flex:1}.container{max-width:var(--max-w);margin:0 auto;padding:0 1.25rem}.site-header{border-bottom:1px solid var(--border);background:var(--bg);z-index:10;-webkit-backdrop-filter:saturate(180%)blur(8px);backdrop-filter:saturate(180%)blur(8px);position:sticky;top:0}.site-header__inner{justify-content:space-between;align-items:center;padding:.875rem 0;display:flex}.site-header__brand{letter-spacing:-.01em;color:var(--fg);align-items:center;gap:.55rem;font-weight:700;display:flex}.site-header__brand:hover{text-decoration:none}.site-header__nav{gap:1.5rem;font-size:.95rem;display:flex}.site-header__nav a{color:var(--fg-soft)}.site-header__nav a:hover{color:var(--brand);text-decoration:none}.site-footer{border-top:1px solid var(--border);color:var(--fg-muted);margin-top:4rem;padding:2rem 0 2.5rem;font-size:.9rem}.site-footer__inner{flex-wrap:wrap;justify-content:space-between;gap:1rem;display:flex}.btn{border-radius:var(--radius);border:1px solid #0000;justify-content:center;align-items:center;gap:.5rem;padding:.7rem 1.1rem;font-size:1rem;font-weight:600;text-decoration:none;transition:background .12s,transform 60ms;display:inline-flex}.btn--primary{background:var(--brand);color:#fff}.btn--primary:hover{background:var(--brand-deep);text-decoration:none}.btn--primary:disabled,.btn--primary[aria-disabled=true]{background:var(--border-strong);cursor:not-allowed}.btn--secondary{color:var(--fg);border-color:var(--border-strong);background:#fff}.btn--secondary:hover{background:var(--bg-alt);text-decoration:none}.card{border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm);background:#fff}.stack-sm>*+*{margin-top:.5rem}.stack>*+*{margin-top:1rem}.stack-lg>*+*{margin-top:2rem}