:root{--bg: #0f131a;--panel: #1b212c;--grid: #2a323f;--ink: #eef3fb;--dim: #93a1b5;--accent: #3ad1d1}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 560px at 50% -8%,#19202b,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:520px;padding:12px 12px 26px}header{text-align:center;margin-bottom:6px}h1{margin:0;font-size:32px;letter-spacing:1px;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(--grid);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:#10171f}.btn{background:var(--panel);border:1px solid var(--grid);color:var(--ink);padding:7px 14px;border-radius:999px;font:700 13px system-ui;cursor:pointer}.btn:hover{border-color:var(--accent)}.scoreboard{display:flex;gap:10px;justify-content:center;margin:8px 0}.readout{background:var(--panel);border:1px solid var(--grid);border-radius:8px;padding:5px 16px;font:800 20px ui-monospace,monospace;color:var(--accent);min-width:100px;text-align:center}.readout span{color:var(--dim);font-size:11px;display:block;font-weight:600;letter-spacing:.5px}.stage{position:relative;display:flex;justify-content:center}.wells{display:flex;gap:16px;justify-content:center}.well{display:flex;flex-direction:column;align-items:center;gap:6px}.welltitle{font:800 13px ui-monospace,monospace;letter-spacing:2px;color:var(--dim)}canvas{background:#15181f;border:1px solid var(--grid);border-radius:8px;display:block}.nextbox{display:flex;align-items:center;gap:6px;font:600 11px system-ui;color:var(--dim)}.nextbox canvas{width:44px;height:44px;border:none;background:transparent}.status{font:600 11px ui-monospace,monospace;color:var(--dim);min-height:14px}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#0a0e14cc;border-radius:12px;backdrop-filter:blur(3px)}.overlay.hidden{display:none}.card{background:var(--panel);border:1px solid var(--grid);border-radius:16px;padding:22px 26px;text-align:center;max-width:320px}.card h2{margin:0 0 6px;font-size:26px;color:var(--accent)}.card p{margin:6px 0;color:var(--dim);font-size:14px}.card .row{display:flex;gap:8px;justify-content:center;margin-top:14px}.hint{text-align:center;color:var(--dim);font-size:12px;margin-top:12px;line-height:1.5}