:root{--bg: #04060d;--panel: #0e1424;--line: #20304e;--ink: #e8eefc;--dim: #8aa0c4;--accent: #ffcf4a}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 560px at 50% -10%,#0a1228,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:760px;padding:12px 12px 26px}header{text-align:center;margin-bottom:6px}h1{margin:0;font-size:25px;letter-spacing:3px;font-weight:800;color:var(--accent)}.sub{margin:2px 0 0;color:var(--dim);font-size:13px}.bar{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;align-items:center;margin:9px 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 14px;font:600 13px system-ui;cursor:pointer}.seg button.active{background:var(--accent);color:#2a2206}.btn{background:var(--panel);border:1px solid var(--line);color:var(--ink);padding:8px 16px;border-radius:999px;font:700 13px system-ui;cursor:pointer}.btn:hover{border-color:var(--accent)}.btn.primary{background:var(--accent);color:#2a2206;border-color:var(--accent)}.stage{position:relative;display:flex;justify-content:center}canvas{width:100%;max-width:720px;height:auto;display:block;border-radius:8px;border:1px solid var(--line);background:#02030a;box-shadow:0 12px 36px #0009;cursor:crosshair;touch-action:none}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#03050cbd;border-radius:8px;backdrop-filter:blur(3px)}.overlay.hidden{display:none}.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:22px 26px;text-align:center;max-width:360px}.card h2{margin:0 0 6px;font-size:24px}.card p{margin:6px 0;color:var(--dim);font-size:14px}.card .big{font-size:34px;font-weight:800;color:var(--accent);margin:8px 0}.card .row{display:flex;gap:8px;justify-content:center;margin-top:14px}.hint{text-align:center;color:var(--dim);font-size:12.5px;margin-top:10px}