:root{--bg: #0e1116;--panel: #181d25;--line: #2a323d;--ink: #eef3f7;--dim: #93a4b3;--accent: #5c9ecf;--cell: #1b212b;--cell2: #222c38;--given: #0f141b;--peer: #1f2733;--sel: #234055;--same: #2c4a63;--bad: #5a1f26;--grid-line: #3a4654;--box-line: #6a7d90}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 560px at 50% -8%,#16202a,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: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 12px;font:600 13px system-ui;cursor:pointer}.seg button.active{background:var(--accent);color:#06202b}.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.on,.btn.primary{background:var(--accent);color:#06202b;border-color:var(--accent)}.scoreboard{display:flex;gap:8px;justify-content:center;margin:8px 0;flex-wrap:wrap}.readout{background:#0a0e13;border:1px solid var(--line);border-radius:8px;padding:5px 14px;font:800 18px ui-monospace,monospace;color:var(--accent);min-width:86px;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}.grid{display:grid;grid-template-columns:repeat(9,1fr);background:var(--grid-line);border:3px solid var(--box-line);border-radius:6px;width:min(94vw,460px);aspect-ratio:1;overflow:hidden}.cell{position:relative;display:flex;align-items:center;justify-content:center;background:var(--cell);color:var(--accent);font-weight:700;font-size:clamp(16px,6vw,28px);aspect-ratio:1;cursor:pointer;border-right:1px solid var(--grid-line);border-bottom:1px solid var(--grid-line)}.cell.given{color:var(--ink);background:var(--given);cursor:default;font-weight:800}.cell.peer{background:var(--peer)}.cell.given.peer{background:#141a22}.cell.same{background:var(--same)}.cell.sel{background:var(--sel);box-shadow:inset 0 0 0 2px var(--accent);z-index:2}.cell.bad{color:#ff9aa6;background:var(--bad)}.cell.sel.bad{box-shadow:inset 0 0 0 2px #ff9aa6}.cell.bt{border-top:2px solid var(--box-line)}.cell.bl{border-left:2px solid var(--box-line)}.cell.br{border-right:2px solid var(--box-line)}.cell.bb{border-bottom:2px solid var(--box-line)}.notes{display:grid;grid-template-columns:repeat(3,1fr);width:100%;height:100%;padding:1px}.notes i{display:flex;align-items:center;justify-content:center;font-style:normal;font-size:clamp(7px,2.3vw,11px);color:var(--dim);font-weight:600;line-height:1}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#080c10c7;border-radius:6px;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:320px}.card h2{margin:0 0 6px;font-size:24px;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}.tools{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin:14px auto 0}.pad{display:grid;grid-template-columns:repeat(9,1fr);gap:6px;max-width:460px;margin:10px auto 0}.pad button{position:relative;background:var(--panel);border:1px solid var(--line);color:var(--ink);padding:14px 0 16px;border-radius:8px;font:800 20px ui-monospace,monospace;cursor:pointer}.pad button:hover{border-color:var(--accent)}.pad button.done{color:var(--dim);opacity:.45}.pad button i{position:absolute;bottom:3px;right:0;left:0;text-align:center;font-style:normal;font-size:10px;font-weight:600;color:var(--dim)}.hint{text-align:center;color:var(--dim);font-size:12px;margin-top:12px;line-height:1.5}