:root{--bg: #0e1116;--panel: #181d25;--line: #2a323d;--ink: #eef3f7;--dim: #93a4b3;--accent: #6a7fd6;--cell: #232b36;--cell2: #1d2530;--filled: #6a7fd6;--bad: #5a1f26}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 560px at 50% -8%,#161b2a,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:620px;padding:12px 12px 26px}header{text-align:center;margin-bottom:6px}h1{margin:0;font-size:28px;letter-spacing:6px;font-weight:800;color:var(--accent)}.sub{margin:3px 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:#0a0e1c}.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)}.btn.primary{background:var(--accent);color:#0a0e1c;border-color:var(--accent)}.scoreboard{display:flex;gap:12px;justify-content:center;align-items:center;margin:8px 0}.readout{background:#0a0e13;border:1px solid var(--line);border-radius:8px;padding:5px 16px;font:800 18px ui-monospace,monospace;color:var(--accent);min-width:92px;text-align:center}.readout span{color:var(--dim);font-size:11px;display:block;font-weight:600;letter-spacing:.5px}.toggle{display:inline-flex;align-items:center;gap:6px;color:var(--dim);font-size:13px;cursor:pointer}.toggle input{accent-color:var(--accent)}.stage{position:relative;display:flex;justify-content:center}.board{display:grid;--n: 5;--rcw: 3;--cch: 3;--u: min(calc((94vw) / (var(--n) + var(--rcw))), calc(560px / (var(--n) + var(--rcw))));grid-template-columns:repeat(var(--rcw),calc(var(--u) * .62)) repeat(var(--n),var(--u));grid-auto-rows:var(--u);gap:0;background:var(--panel);border:2px solid var(--line);border-radius:8px;padding:6px}.corner{background:transparent}.colclue,.rowclue{display:flex;color:var(--dim);font:700 clamp(9px,2.4vw,14px) ui-monospace,monospace}.colclue{flex-direction:column;align-items:center;justify-content:flex-end;padding-bottom:3px;gap:1px}.rowclue{flex-direction:row;align-items:center;justify-content:flex-end;padding-right:5px;gap:4px}.colclue span,.rowclue span{line-height:1.05}.colclue.sat,.rowclue.sat{color:#46506b;opacity:.55}.gcell{background:var(--cell);border:1px solid #161b22;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:clamp(10px,3vw,16px);color:var(--dim)}.gcell.band{background:var(--cell2)}.gcell:hover{outline:1px solid var(--accent);outline-offset:-1px}.gcell.filled{background:var(--filled);border-color:#4f63bb}.gcell.xmark{color:#6c7c8c}.gcell.bad{background:var(--bad);color:#ff9aa6}.gcell.t5{border-left:2px solid #3a4456}.gcell.l5{border-top:2px solid #3a4456}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#080a12cc;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:340px}.card h2{margin:0 0 10px;font-size:24px;color:var(--accent)}.card p{margin:10px 0;color:var(--dim);font-size:14px}.card .row{display:flex;gap:8px;justify-content:center;margin-top:14px}.pic{display:grid;gap:1px;width:180px;margin:0 auto;background:var(--line);padding:2px;border-radius:6px}.pic i{aspect-ratio:1;background:#0c1018;border-radius:1px}.pic i.on{background:var(--accent)}.hint{text-align:center;color:var(--dim);font-size:12px;margin-top:14px;line-height:1.5}