:root{--ink: #0f172a;--slate: #64748b;--line: #e2e8f0;--blue: #5b89c6;--bg: #f1f5f9;--card: #ffffff;color-scheme:light}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Inter,sans-serif;line-height:1.5;-webkit-font-smoothing:antialiased}code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9em;background:#eef2f7;padding:.1em .35em;border-radius:4px}.page{max-width:880px;margin:0 auto;padding:48px 20px 64px}.hero h1{font-size:2rem;margin:0 0 8px;letter-spacing:-.02em}.hero p{color:var(--slate);max-width:60ch;margin:0 0 16px}.links{display:flex;gap:16px}.links a{color:var(--blue);font-weight:600;text-decoration:none}.links a:hover{text-decoration:underline}.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:24px;margin-top:28px;box-shadow:0 1px 2px #0f172a0a,0 12px 28px -18px #0f172a40}.card h2{margin:0 0 4px;font-size:1.15rem}.muted{color:var(--slate);margin:0 0 18px;font-size:.92rem;max-width:64ch}.stage{position:relative;height:380px;border:1px solid var(--line);border-radius:12px;overflow:hidden;cursor:grab;touch-action:none;background:#fbfdff}.stage:active{cursor:grabbing}.stage-svg{display:block;width:100%;height:100%;-webkit-user-select:none;user-select:none}.toolbar{position:absolute;top:12px;right:12px;display:flex;gap:6px}.toolbar button{height:30px;min-width:30px;padding:0 10px;border:1px solid var(--line);background:#ffffffe6;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);border-radius:8px;font-size:13px;font-weight:600;color:var(--ink);cursor:pointer;transition:background .15s,border-color .15s}.toolbar button:hover{background:#fff;border-color:var(--blue)}.readout{position:absolute;bottom:12px;left:12px;font-family:ui-monospace,monospace;font-size:12px;color:var(--slate);background:#ffffffd9;padding:2px 8px;border-radius:6px;border:1px solid var(--line)}.hint{position:absolute;bottom:12px;right:12px;font-size:11px;color:#94a3b8}.ruler-svg{display:block;width:100%;max-width:560px;margin:0 auto}.switch{display:flex;align-items:center;gap:8px;justify-content:center;margin-top:8px;font-size:.9rem;color:var(--slate);cursor:pointer}.switch input{width:16px;height:16px;accent-color:var(--blue)}.foot{margin-top:40px;text-align:center;color:#94a3b8;font-size:.85rem}