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#5d4e0f;transform:scale(1.08);filter:brightness(1.1)}.blocksum-cell-empty.blocksum-cell-selected{background-color:#2980b9;background-image:none}.blocksum-cell-pop{animation:blocksum-bubble-pop .38s ease-out forwards;pointer-events:none}@keyframes blocksum-bubble-pop{0%{transform:scale(1);opacity:1;filter:brightness(1)}35%{transform:scale(1.2);opacity:1;filter:brightness(1.3)}to{transform:scale(1.6);opacity:0;filter:brightness(1.5)}}.blocksum-gameover-overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:rgba(0,0,0,.55);border-radius:12px;display:flex;align-items:center;justify-content:center;z-index:10}.blocksum-gameover-content{text-align:center;padding:32px 24px;background:rgba(255,255,255,.95);border-radius:12px;box-shadow:0 4px 24px #0003}.blocksum-gameover-content h2{margin:0 0 12px;color:#2c3e50;font-size:1.4rem}.blocksum-final-score{font-size:1.5rem;font-weight:700;color:#27ae60;margin-bottom:16px}.blocksum-name-label{font-size:.95rem;color:#555;margin:0 0 8px}.blocksum-name-input{display:block;width:100%;max-width:200px;margin:0 auto 16px;padding:10px 14px;font-size:1rem;border:2px solid #bdc3c7;border-radius:8px;box-sizing:border-box}.blocksum-name-input:focus{outline:none;border-color:#3498db}.blocksum-loading-msg{margin:0;font-size:.95rem;color:#7f8c8d}.blocksum-gameover-buttons{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.blocksum-btn{padding:12px 24px;border:none;border-radius:8px;font-size:1rem;cursor:pointer}.blocksum-btn-primary{background:#3498db;color:#fff}.blocksum-btn-primary:hover{background:#2980b9}.blocksum-btn-back{background:#95a5a6;color:#fff}.blocksum-btn-back:hover{background:#7f8c8d}.blocksum-btn-leaderboard{background:#27ae60;color:#fff}.blocksum-btn-leaderboard:hover{background:#219a52}@media (max-width: 480px){.blocksum-game{padding:12px}.blocksum-header{flex-direction:column;align-items:stretch}.blocksum-header h2{font-size:1.1rem;text-align:center}.blocksum-grid{max-height:68vh;gap:5px;padding:5px}.blocksum-cell{font-size:clamp(.7rem,3vw,.95rem)}}.leaderboard-page{max-width:96%;margin:0 auto;padding:20px}.leaderboard-box{max-width:420px;margin:0 auto;background:white;border-radius:12px;box-shadow:0 4px 20px #0000001a;padding:24px}.leaderboard-back{display:block;margin:0 0 16px;padding:8px 14px;background:#e74c3c;color:#fff;border:none;border-radius:6px;font-size:.9rem;cursor:pointer}.leaderboard-back:hover{background:#c0392b}.leaderboard-box h2{margin:0 0 12px;font-size:1.4rem;color:#2c3e50}.leaderboard-tabs{display:flex;gap:0;margin-bottom:12px;border-radius:8px;overflow:hidden;border:1px solid #ecf0f1}.leaderboard-tab{flex:1;padding:10px 14px;font-size:.95rem;font-weight:600;border:none;background:#ecf0f1;color:#7f8c8d;cursor:pointer;transition:background .2s,color .2s}.leaderboard-tab:hover{background:#dfe6e9;color:#2c3e50}.leaderboard-tab.active{background:#3498db;color:#fff}.leaderboard-desc{margin:0 0 20px;font-size:.85rem;color:#7f8c8d;line-height:1.4}.leaderboard-list{list-style:none;padding:0;margin:0}.leaderboard-empty{text-align:center;padding:32px 16px;color:#95a5a6;font-size:1rem}.leaderboard-error{color:#e74c3c}.leaderboard-row{display:grid;grid-template-columns:36px 1fr 90px;align-items:center;gap:12px;padding:12px 14px;border-bottom:1px solid #ecf0f1;font-size:1rem}.leaderboard-row:last-child{border-bottom:none}.leaderboard-rank{font-weight:800;color:#3498db;font-size:1.1rem}.leaderboard-name{font-weight:600;color:#2c3e50;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.leaderboard-score{text-align:right;font-weight:700;color:#27ae60;font-size:.95rem}.leaderboard-hint{margin:16px 0 0;font-size:.85rem;color:#95a5a6;text-align:center}.matchline-game{max-width:96%;margin:0 auto;padding:12px;user-select:none;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none}.matchline-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px;flex-wrap:wrap;gap:8px}.matchline-back{background:#e74c3c;color:#fff;border:none;padding:8px 14px;border-radius:6px;font-size:.9rem;cursor:pointer}.matchline-back:hover{background:#c0392b}.matchline-header h2{margin:0;font-size:1.25rem;color:#2c3e50}.matchline-header-right{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.matchline-giveup{padding:6px 12px;font-size:.85rem;font-weight:600;color:#e74c3c;background:transparent;border:1px solid #e74c3c;border-radius:6px;cursor:pointer}.matchline-giveup:hover{background:#e74c3c;color:#fff}.matchline-round{font-size:.95rem;color:#7f8c8d;font-weight:600}.matchline-timer{font-weight:700;font-size:1.1rem;color:#2c3e50;min-width:3ch}.matchline-timer.matchline-timer-low{color:#e74c3c}.matchline-score{font-weight:700;font-size:1.1rem;color:#27ae60}.matchline-rule{font-size:.85rem;color:#666;margin-bottom:12px;line-height:1.4}.matchline-grid-wrap{max-width:400px;margin:0 auto 16px;user-select:none;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;position:relative}.matchline-floating-scores{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;overflow:visible}.matchline-score-pop{position:absolute;transform:translate(-50%,-50%);font-size:1.5rem;font-weight:700;color:#ffeb3b;text-shadow:1px 1px 0 #000,-1px -1px 0 #000,1px -1px 0 #000,-1px 1px 0 #000,0 1px 0 #000,0 -1px 0 #000,1px 0 0 #000,-1px 0 0 #000;animation:matchline-score-pop .6s ease-out forwards;white-space:nowrap}@keyframes matchline-score-pop{0%{opacity:0;transform:translate(-50%,-50%) scale(.6)}15%{opacity:1;transform:translate(-50%,-50%) scale(1.2)}to{opacity:0;transform:translate(-50%,-50%) translateY(-28px) scale(1.1)}}.matchline-grid{display:grid;gap:4px;background:#34495e;padding:6px;border-radius:10px;aspect-ratio:1}.matchline-cell{border:none;border-radius:8px;font-size:clamp(1rem,4vw,1.8rem);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:transform .15s,box-shadow .15s;min-height:0;background:#ecf0f1;user-select:none;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none}.matchline-cell:hover:not(:disabled){transform:scale(1.05);box-shadow:0 2px 8px #0003}.matchline-cell:disabled{cursor:default;opacity:.7}.matchline-cell.matchline-selected{transform:scale(1.1);box-shadow:0 0 0 3px #3498db;background:#dfe6e9}.matchline-cell.matchline-cell-dragging{opacity:.4}.matchline-cell.matchline-pop{animation:matchline-pop .22s ease-out forwards;pointer-events:none}@keyframes matchline-pop{0%{transform:scale(1);opacity:1}50%{transform:scale(1.2);opacity:1}to{transform:scale(0);opacity:0}}.matchline-cell.matchline-fall{animation:matchline-fall .38s cubic-bezier(.34,1.56,.64,1) forwards}@keyframes matchline-fall{0%{transform:translateY(-100%);opacity:.8}to{transform:translateY(0);opacity:1}}.matchline-drag-ghost{position:fixed;width:48px;height:48px;margin-left:-24px;margin-top:-24px;display:flex;align-items:center;justify-content:center;font-size:1.8rem;pointer-events:none;z-index:1000;background:#dfe6e9;border-radius:8px;box-shadow:0 0 0 2px #3498db,0 4px 12px #00000040;animation:matchline-drag-float .15s ease-out}@keyframes matchline-drag-float{0%{transform:scale(.9);opacity:.9}to{transform:scale(1.1);opacity:1}}.matchline-shape-0{color:#e74c3c}.matchline-shape-1{color:#3498db}.matchline-shape-2{color:#2ecc71}.matchline-shape-3{color:#f39c12}.matchline-shape-4{color:#9b59b6}.matchline-cell.matchline-steel{background:linear-gradient(145deg,#5d6d7e,#4a5a6a);color:#2c3e50;cursor:default;box-shadow:inset 0 1px 2px #ffffff1a}.matchline-cell.matchline-steel:hover{transform:none;box-shadow:inset 0 1px 2px #ffffff1a}.matchline-game-over{position:fixed;top:0;right:0;bottom:0;left:0;background:rgba(0,0,0,.6);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;z-index:500}.matchline-game-over-title{margin:0;font-size:1.5rem;font-weight:700;color:#fff}.matchline-game-over-score{margin:0;font-size:1.25rem;color:#f1c40f}.matchline-game-over .matchline-reset{margin:0}.matchline-game-over-round{margin:0;font-size:1rem;color:#bdc3c7}.matchline-game-over-loading,.matchline-game-over-top10{margin:0;font-size:.95rem}.matchline-game-over-name{display:block;width:100%;max-width:200px;margin:8px auto;padding:10px 12px;font-size:1rem;border:2px solid #ecf0f1;border-radius:8px;text-align:center}.matchline-game-over-name:focus{outline:none;border-color:#3498db}.matchline-game-over-buttons{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-top:8px}.matchline-game-over-buttons .matchline-reset{margin:0}.matchline-btn-leaderboard{background:#27ae60!important;color:#fff!important}.matchline-btn-leaderboard:hover{background:#219a52!important}.matchline-footer-buttons{margin-top:8px}.matchline-game-over.matchline-game-over-clear .matchline-game-over-title{color:#2ecc71}.matchline-game-over.matchline-game-over-clear .matchline-game-over-score{color:#f1c40f}.matchline-reset{display:block;margin:0 auto;padding:10px 24px;font-size:1rem;background:#3498db;color:#fff;border:none;border-radius:8px;cursor:pointer}.matchline-reset:hover{background:#2980b9}@media (max-width: 480px){.matchline-grid{gap:3px;padding:4px}.matchline-cell{font-size:clamp(.9rem,6vw,1.4rem)}}.game-start-wrap{max-width:96%;margin:0 auto;padding:20px}.game-start-screen{text-align:center;padding:32px 24px;max-width:400px;margin:0 auto;background:white;border-radius:12px;box-shadow:0 4px 12px #0000001a}.game-start-back{display:block;margin:0 auto 20px;padding:8px 16px;background:#e74c3c;color:#fff;border:none;border-radius:6px;font-size:.9rem;cursor:pointer}.game-start-back:hover{background:#c0392b}.game-start-screen h2{margin:0 0 24px;color:#2c3e50;font-size:1.4rem}.game-start-btn{display:block;width:100%;padding:14px 24px;font-size:1.1rem;font-weight:700;background:#3498db;color:#fff;border:none;border-radius:8px;cursor:pointer}.game-start-btn:hover{background:#2980b9}.minigames-page{padding:20px}.minigames-container{max-width:800px;margin:0 auto;text-align:center}.minigames-container h1{color:#2c3e50;margin-bottom:10px}.minigames-container p{color:#666;margin-bottom:30px}.games-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px;margin-top:30px}.game-card{background:white;border-radius:12px;padding:20px;box-shadow:0 4px 6px #0000001a;cursor:pointer;transition:transform .3s ease,box-shadow .3s ease;border:2px solid transparent}.game-card:hover{transform:translateY(-5px);box-shadow:0 8px 15px #0003;border-color:#3498db}.game-card h3{color:#2c3e50;margin-bottom:15px;font-size:1.3rem}.game-preview{font-size:3rem;margin:20px 0;min-height:60px;display:flex;align-items:center;justify-content:center}.preview-tictactoe{font-size:2rem;letter-spacing:10px}.preview-memory{font-size:2.5rem;letter-spacing:5px}.preview-snake{font-size:3rem}.preview-dinorun{font-size:2.5rem;letter-spacing:8px}.preview-slidepuzzle{font-size:3rem}.preview-sudoku{font-size:2.5rem}.preview-blocksum{font-size:2rem;font-weight:700;letter-spacing:2px}.preview-leaderboard{font-size:2.5rem}.preview-matchline{font-size:1.8rem;letter-spacing:4px;color:#2c3e50}.game-card p{color:#666;font-size:.9rem;margin:0}@media (max-width: 768px){.games-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:15px}.game-card{padding:15px}.game-preview{font-size:2.5rem;min-height:50px}.preview-tictactoe{font-size:1.8rem;letter-spacing:8px}.preview-memory{font-size:2rem;letter-spacing:4px}.preview-snake{font-size:2.5rem}.preview-dinorun{font-size:2rem;letter-spacing:6px}.preview-slidepuzzle{font-size:2.5rem}.preview-sudoku{font-size:2rem}.preview-blocksum{font-size:1.8rem}.preview-leaderboard{font-size:2.2rem}.preview-matchline{font-size:1.6rem;letter-spacing:3px}}@media (max-width: 480px){.minigames-page{padding:15px}.games-grid{grid-template-columns:1fr;gap:15px}.game-card{padding:15px}.game-preview{font-size:2rem;min-height:40px}.preview-tictactoe{font-size:1.5rem;letter-spacing:6px}.preview-memory{font-size:1.8rem;letter-spacing:3px}.preview-snake{font-size:2rem}.preview-dinorun{font-size:1.8rem;letter-spacing:4px}.preview-slidepuzzle{font-size:2rem}.preview-sudoku{font-size:1.8rem}.preview-blocksum{font-size:1.6rem}.preview-leaderboard{font-size:1.8rem}.preview-matchline{font-size:1.4rem;letter-spacing:2px}.game-card h3{font-size:1.1rem}}@media (max-width: 360px){.minigames-page{padding:10px}.game-card{padding:12px}.game-preview{font-size:1.8rem;min-height:35px}.preview-tictactoe{font-size:1.3rem;letter-spacing:5px}.preview-memory{font-size:1.6rem;letter-spacing:2px}.preview-snake{font-size:1.8rem}.preview-dinorun{font-size:1.6rem;letter-spacing:3px}.preview-slidepuzzle{font-size:1.8rem}.preview-sudoku{font-size:1.6rem}.preview-blocksum{font-size:1.4rem}.preview-leaderboard{font-size:1.6rem}.preview-matchline{font-size:1.2rem;letter-spacing:1px}.game-card h3{font-size:1rem}}@media (max-width: 768px){main{padding:10px}}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.6;color:#333;background-color:#f5f5f5}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}.App{min-height:100vh;display:flex;flex-direction:column}main{flex:1;padding:20px;max-width:1200px;margin:0 auto;width:100%}.section{margin-bottom:40px;padding:20px;background:white;border-radius:8px;box-shadow:0 2px 4px #0000001a}h1,h2,h3{margin-bottom:16px;color:#2c3e50}h1{font-size:2.5rem;text-align:center}h2{font-size:2rem}h3{font-size:1.5rem}p{margin-bottom:16px;line-height:1.6}button{cursor:pointer;border:none;border-radius:4px;padding:8px 16px;font-size:1rem;transition:background-color .3s}button:hover{opacity:.8}input,textarea{width:100%;padding:8px 12px;border:1px solid #ddd;border-radius:4px;font-size:1rem}input:focus,textarea:focus{outline:none;border-color:#3498db;box-shadow:0 0 0 2px #3498db33}