:root{--bg: #0d1117;--panel: #161d26;--ink: #e8eef5;--muted: #8fa3b8;--board-edge: rgba(56, 189, 248, .16);--cellbg: #1e2733;--accent: #38bdf8;--merc: #fb7185;--tube: #2c3b4c;--good: #4ade80;--bad: #f87171;--hintc: #fbbf24;--cell: 52px;--cluew: 30px}*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:radial-gradient(1100px 640px at 50% -8%,#16273a 0%,var(--bg) 60%);color:var(--ink);font:15px/1.5 ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif}main{max-width:720px;margin:0 auto;padding:32px 20px 48px;text-align:center}h1{margin:0;font-size:34px;letter-spacing:.5px}h1 span{color:var(--merc);text-shadow:0 0 18px rgba(251,113,133,.45)}.sub{margin:6px auto 20px;max-width:600px;color:var(--muted)}.sub strong,.note strong{color:var(--ink)}#wrap{display:flex;justify-content:center}#board{display:grid;padding:14px;background:var(--panel);border:1px solid var(--board-edge);border-radius:14px;position:relative;gap:0}.badge{position:absolute;top:-9px;right:14px;font-size:11px;letter-spacing:.6px;text-transform:uppercase;color:var(--muted);background:var(--bg);padding:0 8px;border-radius:6px}.corner{width:var(--cluew);height:var(--cluew)}.clue{display:flex;align-items:center;justify-content:center;color:var(--muted);font-weight:700;font-size:15px}.clue.col{width:var(--cell);height:var(--cluew)}.clue.row{width:var(--cluew);height:var(--cell)}.clue.done{color:var(--good);opacity:.75}.clue.bad{color:var(--bad)}.cell{width:var(--cell);height:var(--cell);border:1px solid rgba(143,163,184,.16);border-radius:0;background:var(--cellbg);cursor:pointer;padding:0;position:relative;transition:box-shadow .12s;overflow:hidden}.cell:hover{box-shadow:inset 0 0 0 2px #38bdf859;z-index:1}.tube{position:absolute;background:var(--tube);pointer-events:none}.tube.core{left:28%;top:28%;width:44%;height:44%;border-radius:50%}.tube.core.bulb{left:12%;top:12%;width:76%;height:76%;box-shadow:inset 0 0 0 2px #8fa3b840}.tube.arm-up{left:28%;top:0;width:44%;height:50%}.tube.arm-down{left:28%;top:50%;width:44%;height:50%}.tube.arm-left{left:0;top:28%;width:50%;height:44%}.tube.arm-right{left:50%;top:28%;width:50%;height:44%}.merc{position:absolute;background:var(--merc);pointer-events:none;display:none;box-shadow:0 0 10px #fb718559}.cell.filled .merc.on{display:block}.merc.core{left:37%;top:37%;width:26%;height:26%;border-radius:50%}.merc.core.bulb{left:24%;top:24%;width:52%;height:52%}.merc.arm-up{left:37%;top:0;width:26%;height:52%}.merc.arm-down{left:37%;top:48%;width:26%;height:52%}.merc.arm-left{left:0;top:37%;width:52%;height:26%}.merc.arm-right{left:48%;top:37%;width:52%;height:26%}.cell.crossed:after{content:"×";position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:20px;font-weight:600;z-index:2}.cell.conflict{box-shadow:inset 0 0 0 2px #f87171a6;z-index:1}.cell.conflict .merc{background:var(--bad)}.cell.conflict:after{color:var(--bad)}.cell.hinted{box-shadow:inset 0 0 0 3px var(--hintc);z-index:1}#board.won .cell{cursor:default}#board.won .merc{background:var(--good);box-shadow:0 0 10px #4ade8066}.hud{min-height:26px;margin:14px 0 4px}#status{color:var(--muted)}#status.good{color:var(--good)}#status.bad{color:var(--bad)}#status.hint{color:var(--hintc)}.controls{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;align-items:center;margin-top:10px}.controls label{color:var(--muted);font-size:14px;display:flex;gap:6px;align-items:center}select,button{background:var(--panel);color:var(--ink);border:1px solid rgba(143,163,184,.35);border-radius:9px;padding:8px 16px;font-size:14px;cursor:pointer;transition:border-color .12s,box-shadow .12s}select:hover,button:hover{border-color:var(--accent);box-shadow:0 0 10px #38bdf840}.note{margin:34px auto 0;max-width:640px;text-align:left;color:var(--muted);font-size:14px;border-top:1px solid rgba(143,163,184,.18);padding-top:18px}@media (max-width: 560px){:root{--cell: 38px;--cluew: 24px}}