:root{--bg: #f4f5f7;--panel: #ffffff;--ink: #1c1f24;--muted: #6b7280;--line: #d5d9e0;--accent: #2563eb;--accent-ink: #ffffff;--block: #1c1f24;--cell: #ffffff;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--ink)}*{box-sizing:border-box}body{margin:0;background:var(--bg)}button{font:inherit;cursor:pointer;border:1px solid var(--line);background:var(--panel);color:var(--ink);padding:.45rem .8rem;border-radius:8px;transition:background .12s,border-color .12s}button:hover{border-color:var(--accent)}button.primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}button.primary:hover{filter:brightness(1.05)}button:disabled{opacity:.5;cursor:not-allowed}.app{max-width:1100px;margin:0 auto;padding:1.25rem 1.5rem 4rem}.app-header{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:1.25rem}.app-header h1{font-size:1.35rem;margin:0}.mode-toggle{display:inline-flex;border:1px solid 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