:root{--ink: #1f2430;--muted: #6b7280;--border: #e3e5ea;--bg: #fafafa;--card: #ffffff;--lead: #4338ca;--lead-bg: #eef0ff;--builder: #0f766e;--builder-bg: #e8f6f4;--adv: #b45309;--adv-bg: #fdf3e3;--warn: #b42318;--warn-bg: #fdeeec;--off: #9aa0ad;--off-bg: #f2f3f5;--mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--ink);background:var(--bg);font-size:15px}code{font-family:var(--mono);font-size:.86em}button{font:inherit;cursor:pointer}a{color:var(--lead)}.app{max-width:1240px;margin:0 auto;padding:22px 16px 36px}header h1{margin:0;font-size:1.65rem;letter-spacing:-.02em}.subtitle{margin:6px 0 0;max-width:76ch;color:var(--muted);font-size:.95rem;line-height:1.5}.links{margin:8px 0 0;font-size:.86rem}main{display:grid;grid-template-columns:minmax(0,1fr) 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