:root{--bg: #0e150d;--panel: #1b261a;--line: #2c3b29;--ink: #eef5ea;--dim: #a7bda0;--accent: #5a9c4a;--ok: #9fe08a;--gold: #ffd24a}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 560px at 50% -8%,#18241500,var(--bg));color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,sans-serif;display:flex;justify-content:center;-webkit-user-select:none;user-select:none}#app{width:100%;max-width:680px;padding:12px 12px 26px}header{text-align:center;margin-bottom:6px}h1{margin:0;font-size:26px;letter-spacing:4px;font-weight:800;color:var(--accent)}.sub{margin:4px 0 0;color:var(--dim);font-size:13px}.bar{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;align-items:center;margin:10px 0}.seg{display:inline-flex;background:var(--panel);border:1px solid var(--line);border-radius:999px;overflow:hidden}.seg button{background:none;border:none;color:var(--dim);padding:6px 13px;font:600 13px system-ui;cursor:pointer}.seg button.active{background:var(--accent);color:#0c160a}.btn{background:var(--panel);border:1px solid var(--line);color:var(--ink);padding:7px 14px;border-radius:999px;font:700 13px system-ui;cursor:pointer}.btn:hover{border-color:var(--accent)}.status{text-align:center;min-height:20px;margin:6px 0;color:var(--ink);font-size:14px;font-weight:600}.stage{display:flex;justify-content:center}canvas{width:100%;max-width:640px;height:auto;aspect-ratio:640 / 420;background:#10180f;border:1px solid var(--line);border-radius:12px;touch-action:none;cursor:ns-resize}.hint{text-align:center;color:var(--dim);font-size:12px;margin-top:10px;line-height:1.5}