.sudoku-grid-wrapper{position:relative;width:100%;max-width:540px;margin:0 auto}.sudoku-grid{display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(9,1fr);border:3px solid var(--color-text);border-radius:var(--radius-sm);aspect-ratio:1 / 1;width:100%;-webkit-user-select:none;user-select:none;outline:none}.sudoku-cell{position:relative;display:flex;align-items:center;justify-content:center;border:1px solid var(--color-border);cursor:pointer;transition:background-color var(--transition-fast);font-size:clamp(1rem,4vw,1.75rem);background-color:var(--color-cell-bg);color:var(--color-text);overflow:hidden}.sudoku-cell[data-col="2"],.sudoku-cell[data-col="5"]{border-right:2px solid var(--color-text)}.sudoku-cell[data-row="2"],.sudoku-cell[data-row="5"]{border-bottom:2px solid var(--color-text)}.sudoku-cell--given{font-weight:700;background-color:var(--color-cell-given-bg);cursor:default;color:var(--color-text)}.sudoku-cell--selected{background-color:var(--color-cell-selected)!important;box-shadow:inset 0 0 0 2px var(--color-primary);z-index:1}.sudoku-cell--highlighted{background-color:var(--color-cell-highlight)}.sudoku-cell--matching{background-color:var(--color-cell-match)}.sudoku-cell--conflict{color:var(--color-error)}.sudoku-cell--conflict:not(.sudoku-cell--given){background-color:var(--color-cell-conflict)}@keyframes cell-shake{0%,to{transform:translate(0)}20%{transform:translate(-3px)}40%{transform:translate(3px)}60%{transform:translate(-2px)}80%{transform:translate(2px)}}.sudoku-cell--incorrect{color:var(--color-error);animation:cell-shake .3s ease-out}@keyframes hint-glow{0%{box-shadow:inset 0 0 0 2px var(--color-warning, #f59e0b)}50%{box-shadow:inset 0 0 8px 2px var(--color-warning, #f59e0b)}to{box-shadow:inset 0 0 0 2px var(--color-warning, #f59e0b)}}.sudoku-cell--hint{background-color:var(--color-warning, #f59e0b)!important;color:var(--color-bg, #ffffff)!important;font-weight:700;animation:hint-glow 1s ease-in-out}@keyframes cell-pop{0%{transform:scale(.5);opacity:0}50%{transform:scale(1.15)}to{transform:scale(1);opacity:1}}.sudoku-cell__value{line-height:1;animation:cell-pop .15s ease-out}.sudoku-cell__pencil{display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(3,1fr);width:100%;height:100%;padding:1px}.sudoku-cell__pencil-mark{display:flex;align-items:center;justify-content:center;font-size:clamp(.5rem,1.5vw,.75rem);font-weight:500;color:var(--color-primary, #2563eb);line-height:1}.sudoku-cell--paused .sudoku-cell__value,.sudoku-cell--paused .sudoku-cell__pencil{visibility:hidden}.sudoku-cell--player-0{color:var(--color-player-0, #9333ea);background-color:var(--color-player-bg-0, rgba(147, 51, 234, .08))}.sudoku-cell--player-1{color:var(--color-player-1, #0891b2);background-color:var(--color-player-bg-1, rgba(8, 145, 178, .08))}.sudoku-cell--player-2{color:var(--color-player-2, #c2410c);background-color:var(--color-player-bg-2, rgba(194, 65, 12, .08))}.sudoku-cell--player-3{color:var(--color-player-3, #0d9488);background-color:var(--color-player-bg-3, rgba(13, 148, 136, .08))}.sudoku-cell--pencil-match{background-color:var(--color-cell-match)}.sudoku-cell--pencil-match .sudoku-cell__pencil-mark{font-weight:700}@media (max-width: 1024px) and (min-width: 769px){.sudoku-grid-wrapper{max-width:480px}}@media (max-width: 768px){.sudoku-grid-wrapper{max-width:min(100%,420px)}}@media (max-width: 480px){.sudoku-grid-wrapper{max-width:100%}.sudoku-cell{font-size:clamp(.875rem,3.5vw,1.5rem)}.sudoku-cell__pencil-mark{font-size:clamp(.35rem,1.1vw,.55rem)}}.number-pad{display:flex;flex-direction:column;gap:var(--space-sm);max-width:540px;margin:0 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var(--transition-fast);font-size:var(--text-base)}.timer__btn:hover{background-color:var(--color-bg-secondary);color:var(--color-text);border-color:var(--color-text-secondary)}.pause-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1000;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--space-xl);background-color:#000000d9}.pause-overlay__title{font-size:var(--text-4xl);font-weight:700;color:#fff}.pause-overlay__seed{display:flex;flex-direction:column;align-items:center;gap:var(--space-xs)}.pause-overlay__seed-label{font-size:var(--text-sm);color:#fff9;text-transform:uppercase;letter-spacing:.05em}.pause-overlay__seed-value{font-size:var(--text-base);color:#ffffffe6;background:#ffffff1a;padding:var(--space-xs) var(--space-md);border-radius:var(--radius-sm);-webkit-user-select:all;user-select:all;cursor:pointer}.pause-overlay__btn{padding:var(--space-md) var(--space-2xl);font-size:var(--text-lg);font-weight:600;border:none;border-radius:var(--radius-md);background-color:var(--color-primary);color:#fff;cursor:pointer;transition:background-color var(--transition-fast)}.pause-overlay__btn:hover{background-color:var(--color-primary-hover)}.pause-overlay__copy-btn{background:#ffffff26;border:1px solid rgba(255,255,255,.3);border-radius:var(--radius-sm);color:#fff;padding:var(--space-xs) var(--space-sm);font-size:var(--text-sm);cursor:pointer;transition:background-color var(--transition-fast)}.pause-overlay__copy-btn:hover{background:#ffffff40}.game-header{display:flex;align-items:center;gap:var(--space-md);flex-wrap:wrap}.game-header__badge{display:inline-flex;align-items:center;padding:var(--space-xs) var(--space-sm);font-size:var(--text-xs);font-weight:600;text-transform:capitalize;border-radius:var(--radius-full);color:#fff}.game-header__badge--easy{background-color:var(--color-success)}.game-header__badge--medium{background-color:var(--color-warning)}.game-header__badge--hard{background-color:#f97316}.game-header__badge--expert{background-color:var(--color-error)}.game-header__mode{font-size:var(--text-sm);font-weight:500;color:var(--color-text-secondary);text-transform:capitalize}.game-header__id{font-size:var(--text-xs);color:var(--color-text-secondary);margin-left:auto}@keyframes fade-in-up{0%{opacity:0;transform:translateY(20px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes bounce-emoji{0%,to{transform:scale(1)}50%{transform:scale(1.3)}}.completion-card{animation:fade-in-up .4s ease-out}.completion-emoji{display:inline-block;animation:bounce-emoji .6s ease-in-out .3s}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}.player-list{padding:var(--space-md);border:1px solid var(--color-border, #e2e8f0);border-radius:var(--radius-md, 8px);background:var(--color-surface, #fff)}.player-list h3{font-size:.875rem;font-weight:600;margin-bottom:var(--space-sm);text-transform:uppercase;letter-spacing:.05em;color:var(--color-text-secondary, #64748b)}.player-list-items{display:flex;flex-direction:column;gap:var(--space-sm)}.player-item{display:flex;align-items:center;gap:var(--space-sm);padding:var(--space-xs) var(--space-sm);border-radius:var(--radius-sm, 4px);background:var(--color-bg, #f8fafc)}.player-indicator{width:10px;height:10px;border-radius:50%;flex-shrink:0}.player-indicator.player-0{background-color:#3b82f6}.player-indicator.player-1{background-color:#10b981}.player-indicator.player-2{background-color:#f59e0b}.player-indicator.player-3{background-color:#ef4444}.player-indicator.player-4{background-color:#0d9488}.player-name{font-weight:500;font-size:.875rem;flex:1}.player-stats{font-size:.75rem;color:var(--color-text-secondary, #64748b)}.player-list-waiting{font-size:.875rem;color:var(--color-text-secondary, #64748b);font-style:italic;padding:var(--space-sm) 0}.connection-status{display:flex;align-items:center;gap:var(--space-xs);font-size:.75rem;margin-top:var(--space-sm);color:var(--color-text-secondary, #64748b)}.connection-dot{width:8px;height:8px;border-radius:50%}.connection-dot.connected{background-color:#10b981}.connection-dot.disconnected{background-color:#ef4444}.opponent-progress{padding:var(--space-md);border:1px solid var(--color-border, 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ease}.opponent-bar-fill.finished{background:#10b981}.opponent-finished-label{font-size:.75rem;color:#10b981;font-weight:600}.achievement-notification-stack{position:fixed;top:var(--space-lg);right:var(--space-lg);z-index:2000;display:flex;flex-direction:column;gap:var(--space-sm);pointer-events:none}.achievement-notification{pointer-events:auto;display:flex;align-items:center;gap:var(--space-md);background:var(--color-bg);border:2px solid var(--color-primary);border-radius:var(--radius-lg);padding:var(--space-md) var(--space-lg);box-shadow:0 8px 24px #0000002e;min-width:280px;max-width:360px;animation:achievement-slide-in .4s ease-out;cursor:pointer}.achievement-notification--exit{animation:achievement-slide-out .3s ease-in forwards}@keyframes achievement-slide-in{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}@keyframes 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var(--color-border);border-radius:var(--radius-lg);text-align:center;min-width:120px}.stats-card__icon{font-size:var(--text-2xl);margin-bottom:var(--space-xs)}.stats-card__value{font-size:var(--text-2xl);font-weight:700;color:var(--color-text);font-variant-numeric:tabular-nums}.stats-card__label{font-size:var(--text-sm);color:var(--color-text-secondary);margin-top:var(--space-xs)}.achievement-badge{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--space-md);background-color:var(--color-bg);border:1px solid var(--color-border);border-radius:var(--radius-lg);text-align:center;min-width:100px;transition:transform .15s ease,box-shadow .15s ease;cursor:default;overflow:visible}.achievement-badge:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0000001a;z-index:100}.achievement-badge--earned{border-color:var(--color-primary);background:linear-gradient(135deg,var(--color-bg),var(--color-bg-secondary))}.achievement-badge--locked 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var(--transition-fast)}.toggle-switch input:checked+.toggle-slider{background-color:var(--color-primary)}.toggle-switch input:checked+.toggle-slider:before{transform:translate(22px)}.tabs{display:flex;border-bottom:2px solid var(--color-border);margin-bottom:var(--space-lg)}.tab{padding:var(--space-sm) var(--space-lg);font-size:var(--text-sm);font-weight:500;color:var(--color-text-secondary);border:none;background:none;cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-2px;transition:all var(--transition-fast)}.tab:hover{color:var(--color-text)}.tab.active{color:var(--color-primary);border-bottom-color:var(--color-primary)}.table{width:100%;border-collapse:collapse}.table th,.table td{padding:var(--space-sm) var(--space-md);text-align:left;border-bottom:1px solid var(--color-border)}.table th{font-size:var(--text-sm);font-weight:600;color:var(--color-text-secondary);background-color:var(--color-bg-secondary)}.table td{font-size:var(--text-sm)}:focus-visible{outline:3px 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var(--space-sm)}.page{max-width:100%}.card{overflow-x:auto}.leaderboard-table{min-width:500px}.tabs{overflow-x:auto;flex-wrap:nowrap;-webkit-overflow-scrolling:touch}.tab{white-space:nowrap;flex-shrink:0}}@media (max-width: 480px){:root{--text-base: .875rem;--text-2xl: 1.25rem;--text-3xl: 1.5rem;--text-4xl: 1.75rem}}.readme-content h1{font-size:var(--text-3xl);font-weight:700;margin:var(--space-lg) 0 var(--space-md)}.readme-content h2{font-size:var(--text-2xl);font-weight:600;margin:var(--space-lg) 0 var(--space-sm);border-bottom:1px solid var(--color-border);padding-bottom:var(--space-xs)}.readme-content h3{font-size:var(--text-lg);font-weight:600;margin:var(--space-md) 0 var(--space-xs)}.readme-content p{margin:var(--space-sm) 0;line-height:1.6}.readme-content ul,.readme-content ol{margin:var(--space-sm) 0;padding-left:var(--space-xl)}.readme-content li{margin:var(--space-xs) 0;line-height:1.5}.readme-content code{background:var(--color-surface, #f3f4f6);padding:1px 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