:root{--bg:#fafafa;--bg-white:#fff;--text:#111;--text-secondary:#333;--text-muted:#666;--border:#111;--border-light:#ccc;--accent-green:#22c55e;--accent-red:#ef4444;--accent-yellow:#eab308;--accent-blue:#3b82f6;--font:system-ui,-apple-system,"Segoe UI",sans-serif;--mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,monospace}*,:after,:before{box-sizing:border-box;margin:0;padding:0}body,html{background:var(--bg);color:var(--text);font-family:var(--font);-webkit-font-smoothing:antialiased;line-height:1.5}.card{background:var(--bg-white);border:2px solid var(--border);padding:1.5rem}.card--subtle{border-color:var(--border-light)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.75rem 1.5rem;font-family:var(--font);font-size:.875rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;cursor:pointer;border:2px solid var(--border);transition:background .1s,color 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