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9);box-sizing:border-box;border-radius:12px;justify-content:space-between;align-items:center;gap:12px;padding:9px 12px;animation:.2s cubic-bezier(.16,1,.3,1) hintSlideDown;display:flex}.feedback-card.success{color:#14532d;background:#f0fdf4;border:1.5px solid #86efac}:root[data-theme=dark] .feedback-card.success{color:#bbf7d0;background:#052e16;border-color:#16a34a}.feedback-card.warning{color:#991b1b;background:#fef2f2;border:1.5px solid #fca5a5}:root[data-theme=dark] .feedback-card.warning{color:#fecaca;background:#450a0a;border-color:#dc2626}.feedback-content{align-items:center;gap:8px;font-size:13.5px;font-weight:600;display:flex}.feedback-icon{font-size:15px;line-height:1}.play-area{flex-direction:column;flex:1;align-items:center;width:100%;min-width:0;min-height:0;padding:12px;display:flex;overflow:auto}.sudoku-container{flex-direction:column;align-items:center;gap:16px;max-width:100%;margin:auto;display:flex}.sudoku-board{grid-template-columns:repeat(9, var(--cell-size,44px));grid-template-rows:repeat(9, var(--cell-size,44px));border:3px solid var(--box-border);background:var(--box-border);-webkit-user-select:none;user-select:none;outline:none;display:grid;box-shadow:0 4px 16px #0000000f}.sudoku-cell{background:var(--cell-bg);cursor:pointer;border-right:1px solid var(--cell-border);border-bottom:1px solid var(--cell-border);justify-content:center;align-items:center;transition:background-color .1s;display:flex;position:relative}.sudoku-cell:nth-child(3n){border-right:2px solid var(--box-border)}.sudoku-cell:nth-child(9n){border-right:none}.sudoku-cell:nth-child(n+19):nth-child(-n+27),.sudoku-cell:nth-child(n+46):nth-child(-n+54){border-bottom:2px solid var(--box-border)}.sudoku-cell:nth-child(n+73):nth-child(-n+81){border-bottom:none}.sudoku-cell.peer{background-color:var(--peer-bg)}.sudoku-cell.matching{background-color:var(--matching-bg)}.sudoku-cell.conflict{background-color:var(--conflict-bg)}.sudoku-cell.selected{background-color:var(--selected-bg)!important}.cell-digit{font-family:var(--sans);font-size:calc(var(--cell-size,44px) * .62);font-weight:500;line-height:1}.sudoku-cell.given .cell-digit{color:var(--clue-color);font-weight:700}.sudoku-cell.user .cell-digit{color:var(--user-color);font-weight:600}.sudoku-cell.conflict .cell-digit{color:var(--conflict-color);font-weight:700}.sudoku-cell.wrong .cell-digit{color:var(--bad);text-decoration:line-through}.sudoku-cell.revealed .cell-digit{color:#1a73e8;font-weight:700}.notes-grid{pointer-events:none;grid-template-rows:repeat(3,1fr);grid-template-columns:repeat(3,1fr);display:grid;position:absolute;inset:1px}.note-item{font-size:calc(var(--cell-size,44px) * 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.15s;display:flex}.action-btn:hover{background:var(--line)}.action-btn.active{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}.number-pad{grid-template-columns:repeat(9,1fr);gap:6px;width:100%;display:grid}.numpad-btn{aspect-ratio:.85;background:var(--key-bg);color:var(--key-text);border:1px solid var(--line);font-family:var(--sans);cursor:pointer;border-radius:8px;justify-content:center;align-items:center;font-size:24px;font-weight:600;transition:background .15s,transform 50ms;display:flex}.numpad-btn:hover{background:var(--key-hover)}.numpad-btn:active{background:var(--key-active);transform:scale(.96)}.levels-screen{flex-direction:column;flex:1;justify-content:center;align-items:center;gap:24px;width:100%;max-width:480px;margin:0 auto;padding:24px 16px;display:flex}.levels-header{text-align:center}.levels-header h1{font-family:var(--serif);margin-bottom:4px;font-size:32px;font-weight:700}.levels-header p{color:var(--muted);font-size:14px}.cards-container{flex-direction:column;gap:12px;width:100%;display:flex}.difficulty-card{background:var(--surface);border:1px solid var(--line);cursor:pointer;border-radius:12px;justify-content:space-between;align-items:center;padding:16px 20px;transition:transform .15s,box-shadow .15s,border-color .15s;display:flex;box-shadow:0 2px 8px #0000000a}.difficulty-card:hover{border-color:var(--text);transform:translateY(-2px);box-shadow:0 6px 20px #00000014}.card-left{flex-direction:column;gap:4px;display:flex}.card-title{font-size:18px;font-weight:700}.card-desc{color:var(--muted);font-size:13px}.card-right{align-items:center;gap:12px;display:flex}.card-status{background:var(--soft);border-radius:14px;padding:4px 10px;font-size:13px;font-weight:600}.card-status.solved{color:#137333;background:#e6f4ea}:root[data-theme=dark] .card-status.solved{color:#81c995;background:#133a20}.play-splash-btn{background:var(--accent);color:var(--accent-ink);cursor:pointer;border:none;border-radius:28px;padding:14px 32px;font-size:16px;font-weight:700;transition:opacity .15s}.play-splash-btn:hover{opacity:.9}.sheet-backdrop{z-index:100;background:#00000073;justify-content:center;align-items:flex-end;animation:.15s fade;display:flex;position:fixed;inset:0}.sheet{background:var(--surface);width:100%;max-width:540px;max-height:85vh;box-shadow:var(--shadow);border-radius:20px 20px 0 0;flex-direction:column;animation:.22s rise;display:flex;overflow:hidden}@media (width>=560px) and (height>=480px){.sheet-backdrop{align-items:center}.sheet{border-radius:20px;max-height:88%;margin-bottom:0}}.sheet-head{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:12px;padding:14px 20px;display:flex}.sheet-head 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8px;font-size:14px;display:flex}.lb-row.is-you{background:var(--peer-bg);border-radius:8px}.lb-rank{width:32px;color:var(--muted);font-weight:700}.lb-user{flex:1;align-items:center;gap:8px;display:flex}.lb-score{font-variant-numeric:tabular-nums;font-weight:600}.avatar{object-fit:cover;border-radius:50%}.avatar-fallback{background:var(--line);color:var(--text);justify-content:center;align-items:center;font-weight:700;display:inline-flex}.help-list{flex-direction:column;gap:12px;padding-left:20px;font-size:14px;display:flex}.help-list li strong{color:var(--text)}.results-container{text-align:center;flex-direction:column;align-items:center;gap:16px;display:flex}.results-title{font-family:var(--serif);font-size:26px;font-weight:700}.results-stat-box{background:var(--soft);border-radius:12px;grid-template-columns:1fr 1fr;gap:12px;width:100%;padding:16px;display:grid}.stat-item{flex-direction:column;gap:4px;display:flex}.stat-val{font-size:24px;font-weight:700}.stat-lbl{color:var(--muted);text-transform:uppercase;font-size:12px}.btn-primary{background:var(--accent);width:100%;color:var(--accent-ink);cursor:pointer;border:none;border-radius:24px;padding:12px 20px;font-size:15px;font-weight:600}.technique-modal{max-width:540px}.technique-section-title{text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin-bottom:8px;font-size:12px;font-weight:700}.technique-card{background:var(--soft);border:1px solid var(--line);border-radius:12px;margin-bottom:16px;padding:12px 14px}.technique-when{color:var(--text);font-size:13px;line-height:1.45}.technique-bullets{color:var(--text);flex-direction:column;gap:8px;margin-bottom:16px;padding-left:20px;font-size:14px;line-height:1.45;display:flex}.mini-board-wrapper{background:var(--soft);border:1px solid var(--line);border-radius:12px;flex-direction:column;align-items:center;gap:12px;margin-bottom:16px;padding:14px;display:flex}.mini-board{border:2px solid var(--box-border);background:var(--box-border);-webkit-user-select:none;user-select:none;grid-template-rows:repeat(9,28px);grid-template-columns:repeat(9,28px);display:grid}.mini-cell{background:var(--cell-bg);border-right:1px solid var(--cell-border);border-bottom:1px solid var(--cell-border);color:var(--text);justify-content:center;align-items:center;font-size:13px;font-weight:600;display:flex;position:relative}.mini-cell:nth-child(3n){border-right:2px solid var(--box-border)}.mini-cell:nth-child(9n){border-right:none}.mini-cell:nth-child(n+19):nth-child(-n+27),.mini-cell:nth-child(n+46):nth-child(-n+54){border-bottom:2px solid var(--box-border)}.mini-cell:nth-child(n+73):nth-child(-n+81){border-bottom:none}.mini-cell.tone-basis{color:#121212!important;background-color:#fef08a!important}:root[data-theme=dark] 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.mini-cell.tone-answer{font-weight:800;color:#bbf7d0!important;background-color:#14532d!important}.mini-notes{pointer-events:none;grid-template-rows:repeat(3,1fr);grid-template-columns:repeat(3,1fr);display:grid;position:absolute;inset:1px}.mini-note-item{color:var(--notes-color);justify-content:center;align-items:center;font-size:7px;font-weight:700;line-height:1;display:flex}.mini-note-item.tone-answer{background:#22c55e;border-radius:50%;color:#fff!important}.mini-note-item.tone-out{background:#ef4444;border-radius:50%;color:#fff!important}.mini-note-item.tone-unit{background:#3b82f6;border-radius:50%;color:#fff!important}.mini-note-item.tone-basis{background:#eab308;border-radius:50%;color:#121212!important}.mini-board-caption{text-align:center;color:var(--text);max-width:340px;font-size:13px;line-height:1.45}.mini-board-badge{text-transform:uppercase;background:var(--accent);color:var(--accent-ink);border-radius:12px;margin-right:6px;padding:2px 8px;font-size:11px;font-weight:700;display:inline-block}.mini-stepper{align-items:center;gap:12px;margin-top:4px;display:flex}.mini-stepper button{background:var(--surface);color:var(--text);border:1px solid var(--line);cursor:pointer;border-radius:14px;padding:5px 12px;font-size:12px;font-weight:600}.mini-stepper button:disabled{opacity:.35;cursor:default}@keyframes rise{0%{opacity:0;transform:translateY(14px)}}@keyframes fade{0%{opacity:0}}.dev-toolbar{background:var(--soft);box-sizing:border-box;border:1px dashed #f57c00;border-radius:12px;flex-direction:column;align-items:center;gap:8px;width:100%;margin-top:14px;padding:10px 14px;display:flex}.dev-badge{color:#f57c00;letter-spacing:.5px;font-size:11px;font-weight:700}.dev-actions{justify-content:center;gap:10px;width:100%;display:flex}.dev-btn{cursor:pointer;border:none;border-radius:8px;flex:1;justify-content:center;align-items:center;gap:6px;padding:10px 14px;font-size:13px;font-weight:600;transition:opacity .15s,transform .1s;display:inline-flex}.dev-btn:hover{opacity:.9;transform:translateY(-1px)}.dev-btn:active{transform:translateY(0)}.dev-solve-btn{color:#fff;background:#2e7d32}.dev-restart-btn{color:#fff;background:#d32f2f}.settings-list{flex-direction:column;gap:10px;display:flex}.setting-row{background:var(--soft);border-radius:12px;justify-content:space-between;align-items:center;gap:16px;padding:12px 14px;display:flex}.setting-text{flex-direction:column;flex:1;gap:3px;display:flex}.setting-label{color:var(--text);font-size:14px;font-weight:600}.setting-desc{color:var(--muted);font-size:12px;line-height:1.3}.switch-toggle{background:var(--line);cursor:pointer;border:none;border-radius:13px;flex-shrink:0;width:44px;height:26px;padding:2px;transition:background-color .2s;position:relative}.switch-toggle.on{background:var(--accent)}.switch-handle{background:#fff;border-radius:50%;width:22px;height:22px;transition:transform .2s;display:block;box-shadow:0 1px 3px #00000040}.switch-toggle.on .switch-handle{transform:translate(18px)}.switch-toggle.off .switch-handle{transform:translate(0)}.auto-candidate-row{justify-content:center;width:100%;margin-top:10px;display:flex}.auto-candidate-btn{border:1px solid var(--line);background:var(--surface);color:var(--text);cursor:pointer;border-radius:20px;align-items:center;gap:10px;padding:8px 16px;font-size:13px;font-weight:600;transition:all .15s;display:inline-flex}.auto-candidate-btn:hover:not(:disabled){border-color:var(--accent)}.auto-candidate-btn.active{background:var(--soft);border-color:var(--accent);color:var(--accent)}.auto-candidate-btn:disabled{opacity:.5;cursor:not-allowed}.toggle-switch{background:var(--line);box-sizing:border-box;border-radius:9px;align-items:center;width:32px;height:18px;padding:2px;transition:background-color .2s;display:flex}.auto-candidate-btn.active .toggle-switch{background:var(--accent)}.toggle-knob{background:#fff;border-radius:50%;width:14px;height:14px;transition:transform .2s;transform:translate(0);box-shadow:0 1px 2px #0003}.auto-candidate-btn.active .toggle-knob{transform:translate(14px)}