*,*:before,*:after{box-sizing:border-box}html,body,#root{margin:0;padding:0;min-height:100vh}body{font-family:var(--font-body);color:var(--ink);line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}:root{--font-display: "Space Grotesk", system-ui, sans-serif;--font-body: "Inter", system-ui, sans-serif;--font-mono: "SF Mono", "Cascadia Code", "Fira Code", monospace;--bg-primary: #f8f6f3;--bg-secondary: #f0ede8;--panel: #ffffff;--panel-border: rgba(0, 0, 0, .06);--panel-hover: #fafaf9;--ink: #1a1a2e;--ink-secondary: #4a4a5a;--ink-muted: #8a8a9a;--accent: #4f46e5;--accent-hover: #4338ca;--accent-light: #e0e7ff;--accent-glow: rgba(79, 70, 229, .15);--accent-warm: #f59e0b;--accent-warm-light: #fef3c7;--success: #10b981;--success-light: #d1fae5;--danger: #ef4444;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .06), 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 4px 12px rgba(0, 0, 0, .07), 0 2px 4px rgba(0, 0, 0, .04);--shadow-lg: 0 12px 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var(--space-sm);display:flex;flex-direction:column;align-items:center;gap:var(--space-xs);min-height:100vh}.app-header{display:flex;align-items:center;gap:var(--space-md);flex-shrink:0}.app-title{margin:0;font-family:var(--font-display);font-size:1.1rem;font-weight:700;color:var(--ink);letter-spacing:-.02em;white-space:nowrap}.brand-icon{color:var(--accent);display:flex;align-items:center}.brand-text h1{margin:0;font-family:var(--font-display);font-size:1.75rem;font-weight:700;color:var(--ink);letter-spacing:-.02em;line-height:1.2}.tagline{margin:0;font-size:.75rem;color:var(--ink-muted);font-weight:600;letter-spacing:.06em;text-transform:uppercase}.mode-tabs{display:flex;gap:2px;background:var(--bg-secondary);border-radius:var(--radius-full);padding:3px;flex-shrink:0}.mode-tabs button{border:0;border-radius:var(--radius-full);padding:var(--space-sm) 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var(--transition-fast)}.difficulty-btn:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-1px);box-shadow:var(--shadow-sm)}.difficulty-btn.active{background:var(--accent);color:#fff;border-color:var(--accent);box-shadow:0 2px 8px var(--accent-glow)}.control-group{flex:1;display:flex;gap:var(--space-xs);align-items:center}.control-group label{font-weight:600;font-size:.8rem;color:var(--ink)}.control-group select{padding:var(--space-xs) var(--space-sm);border:1.5px solid var(--panel-border);border-radius:var(--radius-sm);font-size:.8rem;font-family:var(--font-body);cursor:pointer;background:var(--panel);color:var(--ink);transition:border-color var(--transition-fast)}.control-group select:hover:not(:disabled){border-color:var(--accent)}.control-group select:disabled{opacity:.5;cursor:not-allowed}.control-group.timer{flex:0 0 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8px;border-radius:var(--radius-full);font-weight:500}.board-controls{display:flex;align-items:center;gap:var(--space-sm);flex-wrap:wrap}.board-controls p{margin:0;font-size:.8rem;color:var(--ink-secondary);flex:1;min-width:120px}.board-grid{display:grid;gap:1px;background:color-mix(in srgb,var(--ink-muted) 40%,transparent);padding:1px;border-radius:var(--radius-md);width:800px;height:800px;max-width:100%;aspect-ratio:1;position:relative;overflow:visible;box-shadow:var(--shadow-lg)}.selection-indicator{position:absolute;transform:translate(-50%);max-width:80%;background:var(--ink);color:#fff;padding:6px 14px;border-radius:var(--radius-sm);font-size:.8rem;font-weight:600;font-family:var(--font-mono);pointer-events:none;z-index:100;box-shadow:var(--shadow-lg);white-space:nowrap;transition:background var(--transition-fast),box-shadow var(--transition-fast)}.selection-indicator.match{background:var(--success);box-shadow:0 4px 16px color-mix(in srgb,var(--success) 40%,transparent)}.selection-indicator.mismatch{background:var(--danger);box-shadow:0 4px 16px color-mix(in srgb,var(--danger) 40%,transparent)}.selection-clue-hint{margin-left:2px;font-weight:700}.cell{background:var(--panel);padding:0;position:relative;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:background-color var(--transition-fast),transform .1s 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solid var(--ink)}.cell.border-right{border-right:2.5px solid var(--ink)}.cell.border-bottom{border-bottom:2.5px solid var(--ink)}.cell.border-left{border-left:2.5px solid var(--ink)}.cell.region-error{animation:region-shake .4s ease,region-pulse 1.8s ease-in-out .4s infinite}@keyframes region-shake{0%,to{transform:translate(0)}20%{transform:translate(-2px)}40%{transform:translate(2px)}60%{transform:translate(-1px)}80%{transform:translate(1px)}}@keyframes region-pulse{0%,to{background-color:inherit}50%{background-color:color-mix(in srgb,var(--danger) 18%,transparent)}}.cell.start{background:var(--accent-light)}.cell.start:hover{background:color-mix(in srgb,var(--accent-light) 85%,var(--accent))}.cell.preview{background:var(--accent-light);opacity:.65}.cell.preview.preview-match{background:var(--success-light);opacity:.8}.cell.preview.preview-mismatch{background:color-mix(in srgb,var(--danger) 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h2{margin:0;font-family:var(--font-display);font-size:1rem;font-weight:600;color:var(--ink)}.board-meta p{margin:var(--space-xs) 0 0;font-size:.8rem;color:var(--ink-muted)}.board-placeholder{width:100%;aspect-ratio:1;max-width:800px;border:2px dashed color-mix(in srgb,var(--ink-muted) 30%,transparent);border-radius:var(--radius-lg);padding:var(--space-xl);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--space-sm);text-align:center;background:color-mix(in srgb,var(--bg-secondary) 50%,transparent)}.placeholder-icon{font-size:3rem;opacity:.25;color:var(--ink-muted)}.placeholder-title{font-family:var(--font-display);font-size:1.1rem;font-weight:600;color:var(--ink);margin:0}.placeholder-subtitle{font-size:.85rem;color:var(--ink-muted);margin:0}.archive-panel,.status-panel{background:var(--panel);border-radius:var(--radius-lg);padding:var(--space-md);box-shadow:var(--shadow-md);border:1px solid var(--panel-border);font-size:.85rem;width:100%;max-width:800px}.archive-panel{display:flex;flex-direction:column;gap:var(--space-sm)}.archive-panel h3{margin:0;font-family:var(--font-display);font-size:1rem;font-weight:600;color:var(--ink)}.archive-panel p{margin:0;font-size:.8rem;color:var(--ink-muted)}.archive-panel ul{margin:var(--space-xs) 0 0;padding-left:var(--space-md);font-size:.8rem}.archive-panel li{margin-bottom:var(--space-xs)}.archive-panel-header{display:flex;justify-content:space-between;align-items:center}.archive-panel-header button{background:none;border:none;font-size:1.25rem;cursor:pointer;color:var(--ink-muted);padding:var(--space-xs) var(--space-sm);border-radius:var(--radius-sm);transition:all var(--transition-fast);line-height:1}.archive-panel-header button:hover{background:var(--bg-secondary);color:var(--ink)}.archive-list{max-height:calc(100vh - 280px);overflow-y:auto;display:flex;flex-direction:column;gap:var(--space-sm)}.archive-list::-webkit-scrollbar{width:5px}.archive-list::-webkit-scrollbar-thumb{background:color-mix(in srgb,var(--ink-muted) 30%,transparent);border-radius:var(--radius-full)}.archive-list::-webkit-scrollbar-track{background:transparent}.archive-date-card{background:var(--bg-secondary);border-radius:var(--radius-md);padding:var(--space-sm) var(--space-md);border:2px solid transparent;transition:all var(--transition-fast);cursor:default}.archive-date-card:hover{box-shadow:var(--shadow-sm);background:color-mix(in srgb,var(--bg-secondary) 70%,var(--panel))}.archive-date-card.selected{border-color:var(--accent);background:var(--accent-light)}.archive-date-card.today{background:var(--accent-warm-light)}.archive-date-card.today.selected{border-color:var(--accent);background:color-mix(in srgb,var(--accent-warm-light) 60%,var(--accent-light))}.archive-date-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--space-xs)}.archive-date-label{font-weight:600;font-size:.85rem;color:var(--ink);display:flex;align-items:center;gap:var(--space-sm)}.archive-today-badge{background:var(--accent-warm);color:#fff;font-size:.6rem;font-weight:700;padding:1px 6px;border-radius:var(--radius-sm);text-transform:uppercase;letter-spacing:.04em}.archive-completion-count{font-size:.75rem;font-family:var(--font-mono);color:var(--ink-muted);font-weight:500}.archive-levels{display:flex;gap:var(--space-xs);flex-wrap:wrap}.archive-level-pill{background:none;border:none;padding:4px 10px;border-radius:var(--radius-full);font-size:.7rem;font-weight:600;font-family:var(--font-body);cursor:pointer;transition:all var(--transition-fast);white-space:nowrap;line-height:1.3;display:inline-flex;align-items:center;gap:3px}.archive-level-pill.solved{background:var(--accent);color:#fff;border:1.5px solid var(--accent)}.archive-level-pill.solved:hover{background:var(--accent-hover);border-color:var(--accent-hover);transform:scale(1.05)}.archive-level-pill.unplayed{background:transparent;color:var(--ink-muted);border:1.5px dashed color-mix(in srgb,var(--ink-muted) 35%,transparent)}.archive-level-pill.unplayed:hover{border:1.5px solid var(--accent);color:var(--accent);transform:scale(1.05);box-shadow:0 0 8px var(--accent-glow)}.archive-date-card.today .archive-level-pill.unplayed{animation:gentle-pulse 2.5s ease-in-out infinite}@keyframes gentle-pulse{0%,to{opacity:1}50%{opacity:.5}}.status-panel{margin-top:0;display:flex;flex-direction:column;gap:var(--space-sm)}.status-panel h3{margin:0;font-family:var(--font-display);font-size:.95rem;font-weight:600}.status-panel p{margin:0;font-size:.8rem;color:var(--ink-secondary)}.status-panel button{align-self:flex-start}@media(max-width:768px){.app{padding:var(--space-sm) var(--space-sm);gap:var(--space-sm)}.controls{padding:var(--space-xs) var(--space-sm)}}@media(max-width:480px){.app{padding:var(--space-sm);gap:var(--space-sm)}.brand-text h1{font-size:1.3rem}.tagline{font-size:.65rem}.controls{padding:var(--space-sm);gap:var(--space-sm)}.controls-top{flex-direction:column;gap:var(--space-sm)}.mode-tabs{width:100%}.mode-tabs button{flex:1;justify-content:center;padding:var(--space-sm);font-size:.8rem}.difficulty-btn{padding:var(--space-xs) var(--space-sm);font-size:.75rem}.primary-btn,.secondary-btn{padding:var(--space-sm) var(--space-md);font-size:.8rem}.timer-value{font-size:1.1rem;min-width:50px}.board-header h2{font-size:.9rem}.archive-panel,.status-panel{padding:var(--space-sm)}.congratulations-message{margin:var(--space-md);padding:var(--space-lg) var(--space-md)}.congrats-time{font-size:1.5rem}.archive-level-pill{padding:3px 8px;font-size:.65rem}}