:root{font-family:system-ui,-apple-system,"Yu Gothic",sans-serif;color:#254439;background:#f5f5ef;font-synthesis:none;line-height:1.65}*{box-sizing:border-box}body{margin:0}main{width:min(100% - 32px,680px);margin:auto;padding:28px 0}header{text-align:center}.eyebrow{font-size:12px;letter-spacing:.1em;color:#638273;margin:0}h1{font-size:clamp(24px,6vw,34px);margin:4px 0 18px}h1 span{color:#41957a}h2{font-size:16px;margin:12px 0}.problem-line{display:flex;align-items:center;justify-content:center;gap:12px;font-size:13px}select{font:inherit;padding:8px 12px;border:1px solid #ccd8cf;border-radius:9px;background:white;color:inherit;max-width:60%}#progress{color:#627d70}.rules{font-size:13px;color:#5b7067;margin-bottom:24px}.rules b{color:#276958}.play-area{position:relative;max-width:560px;margin:auto}.board{display:grid;grid-template-columns:repeat(var(--columns),1fr);width:100%;background:#ccd9cf;border:3px solid #b9cbc0;border-radius:8px;overflow:hidden;gap:1px;touch-action:manipulation}.cell{position:relative;aspect-ratio:1;min-width:0;min-height:0;border:0;border-radius:0;background:#fffef9;padding:0;cursor:pointer;color:#658b6c;font-size:clamp(13px,4vw,24px)}.cell.start{background:#fff2ce;color:#b88523}.cell.occupied{background:var(--piece-color);color:white;box-shadow:inset 0 0 0 1px #ffffff40}.cell.legal::after{content:"";position:absolute;inset:41%;background:#288568;border-radius:50%}.cell.preview-ok{background:#b6dfce;box-shadow:inset 0 0 0 2px #276958}.cell.preview-no{box-shadow:inset 0 0 0 3px #c86856;background:#f6d8d0}.cell.occupied.preview-no{background:#d19789}.cell.chosen{box-shadow:inset 0 0 0 3px #203b30;filter:brightness(1.1)}button{font:inherit;font-size:13px;font-weight:650;min-height:44px;border:1px solid #ccd8cf;border-radius:9px;background:white;color:#345c4d;padding:9px 12px;cursor:pointer;touch-action:manipulation}button:hover:not(:disabled){filter:brightness(.97)}button:disabled{opacity:.4;cursor:default}button:focus-visible,select:focus-visible{outline:3px solid #d78c35;outline-offset:2px}.primary{background:#276958;border-color:#276958;color:white}.message{min-height:50px;font-size:13px;text-align:center;padding:10px 4px;margin:10px 0;color:#276958}.message.error{color:#a64937}.pieces-panel{background:white;border:1px solid #dce4dc;padding:20px;border-radius:16px}.panel-title{display:flex;justify-content:space-between;align-items:center}.panel-title h2{margin:0}.panel-title span{font-size:12px;color:#6d8276}.pieces{display:flex;flex-wrap:wrap;gap:9px;margin:16px 0}.piece{min-width:78px;display:flex;flex-direction:column;align-items:center;gap:8px;padding:10px}.piece[aria-pressed=true]{border:2px solid #276958;background:#eef7f0;padding:9px}.piece-name{font-size:10px;color:#587666}.mini{display:grid;gap:2px;grid-template-columns:repeat(var(--w),13px);grid-template-rows:repeat(var(--h),13px);min-height:26px;align-content:center}.mini-cell{background:var(--piece-color);border-radius:2px;display:grid;place-items:center;color:white;font-size:8px;line-height:1}.tools{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.history-tools{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}.history-tools button{flex:1}#remove{flex-basis:100%}.hint{font-size:11px;color:#6a7e71;line-height:1.9}.legend-dot{color:#288568}.clear{background:#e7f4e9;border:1px solid #a8cbb4;border-radius:12px;text-align:center;padding:18px;margin-top:14px}.clear strong{font-size:30px;color:#276958}.clear p{font-size:13px;margin:5px 0 12px}[hidden]{display:none!important}footer{text-align:center;color:#7c8c80;font-size:11px;margin-top:22px}@media(max-width:420px){main{width:calc(100% - 24px);padding-top:18px}.pieces-panel{padding:14px}.piece{min-width:68px}.pieces{gap:7px}.rules{font-size:12px}.cell{min-height:0;padding:0}.problem-line{gap:8px}}

#difficulty{font-size:12px;color:#8b782e;white-space:nowrap;margin-left:6px}

#game-title{touch-action:manipulation;user-select:none;-webkit-user-select:none}
#admin-tools{margin:-8px 0 10px}#admin-tools button{font-size:11px;padding:6px 10px}
.cell:disabled{opacity:1}