:root{color:#171717;font-synthesis:none;text-rendering:optimizelegibility;--bg:#fff;--surface:#fafafa;--surface-strong:#fff;--text:#171717;--muted:#737373;--border:#e5e5e5;--border-strong:#d4d4d4;--accent:#2563eb;--accent-soft:#eff6ff;background:#fff;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}:root[data-theme=dark]{--bg:#111;--surface:#171717;--surface-strong:#1c1c1c;--text:#f5f5f5;--muted:#a3a3a3;--border:#2a2a2a;--border-strong:#3a3a3a;--accent:#60a5fa;--accent-soft:#172554}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--bg);min-width:320px;color:var(--text);margin:0}button,input,select{font:inherit}button{cursor:pointer}button,input,select{outline:none}a{color:inherit;text-decoration:none}.app{width:min(1180px,100% - 32px);margin:auto}.nav{border-bottom:1px solid var(--border);align-items:center;gap:28px;height:64px;display:flex}.brand{align-items:center;gap:8px;font-size:17px;font-weight:700;display:flex}.brand-mark{border:1px solid var(--border-strong);background:var(--surface);width:26px;height:26px;color:var(--text);border-radius:5px;place-items:center;font-size:13px;font-weight:700;display:grid}.nav nav{color:var(--muted);gap:20px;font-size:13px;display:flex}.nav nav a:hover{color:var(--text)}.theme-button{border:1px solid var(--border);background:var(--surface-strong);color:var(--text);border-radius:5px;margin-left:auto;padding:7px 11px;font-size:12px}.theme-button:hover{border-color:var(--border-strong)}.builder{grid-template-columns:minmax(0,1.6fr) minmax(320px,.8fr);align-items:start;gap:24px;padding-top:42px;display:grid}.controls,.preview{min-width:0}.controls{border:1px solid var(--border);background:var(--surface-strong);padding:22px}.title{margin-bottom:24px}.title h1{letter-spacing:-.03em;margin:0;font-size:25px}.title 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