:root{color:#e6edf7;background:#08111f;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:radial-gradient(circle at 18% 8%,rgba(45,91,185,.22),transparent 34%),radial-gradient(circle at 85% 12%,rgba(20,184,166,.12),transparent 30%),#08111f}button,input,select{font:inherit}button{border:1px solid #2a3a52;border-radius:10px;background:#101c2d;color:#e6edf7;cursor:pointer;min-height:38px;padding:0 14px;transition:transform .12s ease,box-shadow .12s ease,filter .12s ease,border-color .12s ease;will-change:transform}button:hover:not(:disabled){filter:brightness(1.06)}button:active:not(:disabled){transform:translateY(1px) scale(.97);box-shadow:inset 0 2px 8px #00000047}button:disabled{cursor:not-allowed;opacity:.5}.app-shell{width:min(1680px,100%);margin:0 auto;padding:34px 34px 22px}.topbar{position:relative;display:grid;justify-items:center;gap:8px;margin-bottom:22px;text-align:center}.topbar>div{width:min(980px,calc(100% - 260px))}.topbar h1{margin:0;font-size:32px;line-height:1.2;letter-spacing:0;color:#f8fbff;text-shadow:0 10px 30px rgba(0,0,0,.35)}.topbar p{max-width:940px;margin:0;color:#93a4bc;font-size:15px;line-height:1.55;text-wrap:balance}.language-control{position:absolute;right:0;top:0;display:grid;gap:6px;color:#a8b6c8;font-size:13px;font-weight:600}.language-control select{min-height:36px;border:1px solid #2d3d55;border-radius:6px;background:#101c2d;color:#e6edf7;padding:0 10px}.workspace{display:grid;grid-template-columns:minmax(430px,.92fr) minmax(520px,1.06fr) minmax(380px,.82fr);gap:26px;align-items:start}.panel{background:linear-gradient(180deg,#131f31f5,#0c1625f5);border:1px solid rgba(105,129,163,.22);border-radius:16px;box-shadow:0 24px 52px #00000047;padding:20px}.panel-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:38px;margin-bottom:16px}.panel-heading h2{margin:0;font-size:22px;line-height:1.2;color:#f8fbff}.panel-heading span{color:#9fb0c6;font-size:13px;font-weight:700}.board-heading-actions{display:flex;align-items:center;justify-content:flex-end;gap:12px}.board-grid{display:grid;grid-template-columns:repeat(9,var(--board-cell-size, 43px));grid-template-rows:repeat(9,var(--board-cell-size, 43px));width:max-content;max-width:100%;background:transparent;gap:var(--board-cell-gap, 8px)}.board-cell{display:grid;place-items:center;min-width:0;min-height:0;border:0;border:1px solid #263850;border-radius:8px;padding:0;color:#fff;font-size:20px;font-weight:800;line-height:1;text-transform:uppercase}.board-cell.available{background:#0d1728;border-color:#22334b;color:transparent}.board-cell.blocked{border-color:#2f3f57;background:#111827;color:#dbeafe}.board-cell.selecting{outline:2px dashed #38bdf8;outline-offset:2px;z-index:1}.board-cell.placed{color:#06101f;text-shadow:0 1px 0 rgba(255,255,255,.22);box-shadow:inset 0 0 0 1px #ffffff6b,0 0 0 1px #00000073}.board-cell.placed:not(.piece-edge-top),.result-panel .board-cell.placed:not(.piece-edge-top){border-top-color:#0000008c}.board-cell.placed:not(.piece-edge-right),.result-panel .board-cell.placed:not(.piece-edge-right){border-right-color:#0000008c}.board-cell.placed:not(.piece-edge-bottom),.result-panel .board-cell.placed:not(.piece-edge-bottom){border-bottom-color:#0000008c}.board-cell.placed:not(.piece-edge-left),.result-panel .board-cell.placed:not(.piece-edge-left){border-left-color:#0000008c}.board-cell.item-instance-0{--piece-outline-color: rgba(255, 255, 255, .92)}.board-cell.item-instance-1{--piece-outline-color: rgba(6, 16, 31, .92)}.board-cell.item-instance-2{--piece-outline-color: rgba(56, 189, 248, .92)}.board-cell.item-instance-3{--piece-outline-color: rgba(251, 191, 36, .92)}.board-cell.piece-edge-top{border-top-color:var(--piece-outline-color);border-top-width:2px}.board-cell.piece-edge-right{border-right-color:var(--piece-outline-color);border-right-width:2px}.board-cell.piece-edge-bottom{border-bottom-color:var(--piece-outline-color);border-bottom-width:2px}.board-cell.piece-edge-left{border-left-color:var(--piece-outline-color);border-left-width:2px}.button-row,.solution-controls{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-top:18px}.button-row{justify-content:center}.primary-button{border-color:#4f8cff;background:linear-gradient(180deg,#3b82f6,#2563eb);color:#fff;font-weight:800}.compact-button{display:inline-flex;align-items:center;justify-content:center;min-height:42px;line-height:1.15;text-align:center;white-space:nowrap}.panel-actions{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:10px}.priority-hint{margin:-4px 0 12px;color:#9fb0c6;font-size:13px;line-height:1.45}.item-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.item-row{display:grid;grid-template-columns:minmax(116px,1fr) 78px;align-items:center;gap:12px;min-height:58px;padding:8px 10px;border:1px solid rgba(99,120,151,.24);border-radius:10px;background:#111d2e}.item-main{display:grid;grid-template-columns:36px auto;align-items:center;gap:8px;min-width:0}.item-main strong{font-size:16px;font-weight:800;color:#eaf2ff}.item-row label{display:grid}.item-row input{width:78px;min-height:34px;border:1px solid #2b3c55;border-radius:10px;background:#0b1424;color:#f8fbff;font-size:18px;text-align:center;padding:0 8px}.item-controls{grid-column:1 / -1;display:grid;grid-template-columns:minmax(0,1fr) minmax(92px,auto);align-items:end;gap:8px}.priority-control,.must-use-control{display:grid;gap:4px;color:#9fb0c6;font-size:12px;font-weight:700}.priority-control select{width:100%;min-height:32px;border:1px solid #2b3c55;border-radius:8px;background:#0b1424;color:#f8fbff;padding:0 8px}.must-use-control{grid-template-columns:auto 1fr;align-items:center;align-self:end;min-height:32px;padding:0 8px;border:1px solid #2b3c55;border-radius:8px;background:#0b1424}.must-use-control input{width:16px;min-height:16px;accent-color:#6ea8ff}.must-use-control:has(input:disabled){opacity:.55}.shape-preview{display:grid;gap:1px;width:max-content;padding:5px;border:1px solid #2b3d57;border-radius:8px;background:#0b1424;box-shadow:0 6px 16px #00000038}.shape-cell{width:10px;height:10px;border:1px solid #3a4b64;border-radius:3px;background:#111d2e}.shape-cell.filled{border-color:#a8b7cc;background:#a8b7cc}.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin:4px 0 18px}.stats div{display:grid;gap:4px;padding:10px 12px;border:1px solid rgba(99,120,151,.24);border-radius:10px;background:#101b2c}.stats span{color:#9fb0c6;font-size:12px}.stats strong{font-size:18px;color:#f8fbff}.solution-controls span{color:#c7d4e6;font-size:13px;font-weight:800;text-align:center}.usage-summary{margin-top:18px}.result-alert{display:grid;gap:4px;margin:0 0 18px;padding:10px 12px;border:1px solid rgba(99,120,151,.24);border-radius:10px;background:#101b2c;color:#c7d4e6;font-size:13px}.result-alert strong{color:#eaf2ff}.result-alert.warning{border-color:#fbbf2475;background:#713f1238}.result-alert.warning strong{color:#facc15}.result-alert.satisfied strong{color:#86efac}.usage-summary h3{margin:0 0 10px;font-size:14px;font-weight:700;color:#9fb0c6}.usage-list{display:flex;flex-wrap:wrap;gap:8px}.usage-card{display:flex;align-items:center;gap:8px;min-width:80px;padding:6px 10px;border:1px solid rgba(99,120,151,.24);border-radius:10px;background:#111d2e}.usage-card .shape-preview{width:fit-content;padding:4px;border:1px solid #2b3d57;border-radius:6px;background:#0b1424;box-shadow:none}.usage-card .shape-cell{width:8px;height:8px;border-radius:2px}.usage-card-body{display:flex;flex-direction:column;gap:2px}.usage-card-body strong{font-size:13px;font-weight:800;color:#eaf2ff}.usage-card-body span{font-size:14px;font-weight:700;color:#6ea8ff}.unused-card{border-color:#fbbf2447}.unused-card .usage-card-body span{color:#facc15}.empty-mini{margin:0;color:#9fb0c6;font-size:13px;line-height:1.5}.empty-state{margin:0;padding:18px;border:1px dashed #3b4d68;border-radius:8px;color:#9fb0c6;font-size:14px;line-height:1.6}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.board-panel .board-grid{margin-inline:auto}.result-panel .board-grid{--board-cell-size: 34px;--board-cell-gap: 6px;margin-inline:auto}.result-panel .board-cell{border-radius:7px;font-size:15px}.result-panel .board-cell.placed{border-color:#0000008c}.result-panel .board-cell.placed.piece-edge-top{border-top-color:var(--piece-outline-color)}.result-panel .board-cell.placed.piece-edge-right{border-right-color:var(--piece-outline-color)}.result-panel .board-cell.placed.piece-edge-bottom{border-bottom-color:var(--piece-outline-color)}.result-panel .board-cell.placed.piece-edge-left{border-left-color:var(--piece-outline-color)}.result-panel .board-cell.available,.result-panel .board-cell.blocked{border-color:#24364e}.result-panel .board-cell.blocked{border-color:#4b5563;background:#6b7280;color:#f8fafc}.result-panel .board-cell.available{background:#101b2c}@media(max-width:1280px){.workspace{grid-template-columns:1fr 1fr}.result-panel{grid-column:1 / -1}}@media(max-width:760px){body{overflow-x:hidden}.app-shell{padding:18px}.topbar{justify-items:start;text-align:left}.topbar>div{width:min(100%,calc(100vw - 36px))}.topbar h1{width:100%;max-width:calc(100vw - 36px);font-size:18px;overflow-wrap:anywhere;word-break:break-all;white-space:normal}.topbar p{width:100%;max-width:calc(100vw - 36px);font-size:14px;overflow-wrap:anywhere;word-break:break-word}.language-control{position:static;width:100%}.workspace{grid-template-columns:1fr}.panel{padding:14px}.panel-heading{align-items:flex-start;flex-direction:column}.board-heading-actions{justify-content:space-between;width:100%}.panel-actions{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));width:100%}.compact-button{min-width:0;padding-inline:6px;overflow-wrap:anywhere;white-space:normal}.item-list{grid-template-columns:1fr}.item-row{grid-template-columns:minmax(0,1fr) 72px}.item-row input{width:72px}.board-grid,.result-panel .board-grid{--board-cell-size: 28px;--board-cell-gap: 4px}}