:root{--primary-color: #2c3e50;--secondary-color: #3498db;--accent-color: #e74c3c;--background-color: #f5f6fa;--board-color: #34495e;--ship-color: #2ecc71;--hit-color: #e74c3c;--miss-color: #95a5a6;--text-color: #2c3e50;--correct-color: #2ecc71;--incorrect-color: #e74c3c}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;margin:0;padding:0;background-color:var(--background-color);color:var(--text-color)}.game-container{max-width:1200px;margin:0 auto;padding:2rem}.start-screen{text-align:center;padding:2rem;background:#fff;border-radius:12px;box-shadow:0 4px 6px #0000001a}.instructions{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;margin:2rem 0;text-align:left}.instructions>div{padding:1.5rem;background:#f8f9fa;border-radius:8px;border:1px solid #e9ecef}.game-content{position:relative;z-index:0;display:flex;flex-direction:column}.game-header{background:#fff;padding:1rem 2rem;border-radius:8px;box-shadow:0 2px 4px #0000001a;margin-bottom:1rem;display:flex;justify-content:space-between}.player-info,.opponent-info{display:flex;flex-direction:column;align-items:center;gap:.5rem}.game-main-content{display:flex;flex-wrap:nowrap;justify-content:center;align-items:flex-start;gap:2.5rem;margin-top:1rem}.center-section{display:flex;flex-direction:column;align-items:center;flex:2;min-width:320px;max-width:520px;margin:.5rem 2rem 0;background:#fff;z-index:2;box-shadow:0 2px 8px #0000000a;border-radius:10px;padding:0 1.5rem 1.5rem}.boards-container{display:flex;flex-direction:column;justify-content:flex-start;align-items:center;gap:1rem;flex:1;min-width:220px;max-width:360px;margin-top:2.5rem}.board-section{text-align:center;width:100%}.board-title{font-weight:700;margin-bottom:.5rem;font-size:1.2rem;color:var(--primary-color)}.board{display:grid;grid-template-columns:repeat(10,1fr);gap:2px;background:var(--board-color);padding:2px;border-radius:8px;position:relative;width:100%;max-width:500px;aspect-ratio:1;border:3px solid var(--board-color);box-shadow:0 4px 8px #0000001a}.question-container{background:#fff;padding:1.5rem;border-radius:8px;box-shadow:0 2px 4px #0000001a;flex:2;min-width:250px;max-width:500px;align-self:stretch;margin:0 1rem;display:block;min-height:220px}.question-placeholder{color:#888;font-size:1.1rem;text-align:center;padding:2.5rem 0;opacity:.8}.next-turn-prompt{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:2rem;border-radius:12px;box-shadow:0 4px 15px #667eea4d;animation:pulse 2s ease-in-out infinite}.next-turn-prompt h3{margin:0 0 1rem;font-size:1.5rem;font-weight:600}.next-turn-prompt p{margin:0;font-size:1.1rem;opacity:.95}@keyframes pulse{0%,to{transform:scale(1);box-shadow:0 4px 15px #667eea4d}50%{transform:scale(1.02);box-shadow:0 6px 20px #667eea80}}.question-container.active{transform:scale(1.02);box-shadow:0 4px 12px #00000026;transition:all .3s ease}.test-description{font-size:1.1rem;line-height:1.5;margin-bottom:1.5rem;background:#f8f9fa;padding:1.2rem;border-radius:8px;border:1px solid #e9ecef}@media (max-width: 992px){.game-main-content{flex-direction:column;align-items:center;gap:1rem}.center-section{max-width:100%;margin:1rem 0;padding:0 .5rem 1rem}.boards-container{margin-top:1.2rem;max-width:98vw}.board{max-width:98vw}.powerup-bar{flex-wrap:wrap}}.boards-container{display:flex;gap:2rem;justify-content:center;margin:2rem 0;position:relative;z-index:0;flex-wrap:wrap}.board-section{text-align:center;flex:1;min-width:250px;max-width:400px}.board{display:grid;grid-template-columns:repeat(10,1fr);gap:1px;background:var(--board-color);padding:1px;border-radius:4px;position:relative;z-index:1;width:100%;aspect-ratio:1;border:2px solid var(--board-color)}.tile{aspect-ratio:1;background:#ecf0f1;border:1px solid #bdc3c7;cursor:pointer;transition:all .2s;position:relative;display:flex;align-items:center;justify-content:center;font-size:1rem;color:#7f8c8d;border-radius:4px}.tile:hover{background:#d6dbdf;transform:scale(1.05);z-index:2;box-shadow:0 2px 4px #0000001a}.tile.ship{background:var(--ship-color);border-color:#45a049;box-shadow:inset 0 0 5px #0003}.tile.hit{background:var(--hit-color);border-color:#c0392b}.tile.miss{background:var(--miss-color);border-color:#7f8c8d}.tile.sunk{background:#9c27b0;border-color:#8e44ad}.tile.valid-placement{background:#2ecc714d;border:2px solid var(--ship-color);box-shadow:0 0 5px #2ecc7180}.tile.invalid-placement{background:#e74c3c4d;border:2px solid var(--hit-color);box-shadow:0 0 5px #e74c3c80}.ships-remaining{display:flex;gap:1rem;margin-top:.5rem}.ship-icon{display:inline-flex;align-items:center;justify-content:center;width:30px;height:30px;background:var(--ship-color);color:#fff;border-radius:4px;font-weight:700}.ship-icon.sunk{background:var(--hit-color);opacity:.5}.game-info{display:flex;justify-content:space-between;align-items:center;margin-top:1rem}.body-part-tag{background:var(--secondary-color);color:#fff;padding:.5rem 1rem;border-radius:20px;font-size:.9rem}.options-container{display:grid;grid-template-columns:1fr;gap:.8rem;margin-top:1.2rem}.option{background:#f8f9fa;padding:1rem;border-radius:8px;cursor:pointer;transition:all .2s ease;border:2px solid transparent;display:flex;align-items:center;font-size:1rem}.option:hover{background:#e9ecef;transform:translateY(-2px)}.option.correct{background:var(--correct-color);color:#fff;border-color:var(--correct-color)}.option.incorrect{background:var(--incorrect-color);color:#fff;border-color:var(--incorrect-color)}.option-text{flex:1}.tile.hit:after{content:"×";color:#fff;font-size:2rem;font-weight:700;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);animation:hitAnimation .3s ease-out;line-height:1;z-index:2}.tile.miss:after{content:"○";color:#fff;font-size:2rem;font-weight:700;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);animation:missAnimation .3s ease-out;line-height:1;z-index:2}@keyframes hitAnimation{0%{transform:translate(-50%,-50%) scale(0)}50%{transform:translate(-50%,-50%) scale(1.2)}to{transform:translate(-50%,-50%) scale(1)}}@keyframes missAnimation{0%{transform:translate(-50%,-50%) scale(0)}50%{transform:translate(-50%,-50%) scale(1.2)}to{transform:translate(-50%,-50%) scale(1)}}.game-controls{display:flex;justify-content:center;gap:1rem;margin-top:2rem}.action-button{padding:.8rem 1.5rem;border:none;border-radius:8px;background:var(--secondary-color);color:#fff;font-weight:600;cursor:pointer;transition:all .2s ease}.action-button:hover{background:#2980b9;transform:translateY(-2px)}.ship-placement{position:absolute;top:0;left:0;width:100%;height:100%;background:#fff;display:none;z-index:100;overflow-y:auto}.ship-placement-container{display:flex;gap:2rem;padding:2rem;max-width:1200px;margin:0 auto;min-height:100%;align-items:flex-start}.ship-controls{flex:0 0 300px;padding:2rem;background:#f8f8f8;border-radius:8px;box-shadow:0 2px 4px #0000001a;position:sticky;top:2rem}.placement-board-container{flex:1;display:flex;flex-direction:column;align-items:center;padding:1rem}.placement-board-container h3{margin-bottom:1rem;color:#333}.dragging{opacity:.5;cursor:grabbing}.drag-over{background:#e8f5e9!important;border-color:#4caf50!important}.ship-selection{display:flex;flex-direction:column;gap:1rem;margin:1.5rem 0}.ship-button{padding:1rem;border:2px solid #e0e0e0;border-radius:6px;background:#fff;cursor:grab;transition:all .2s;font-size:1rem;text-align:left;position:relative;-webkit-user-select:none;user-select:none;margin-bottom:.5rem;box-shadow:0 2px 4px #0000001a}.ship-button:hover{background:#f0f0f0;transform:translate(5px);box-shadow:0 4px 8px #00000026}.ship-button.selected{background:var(--ship-color);color:#fff;border-color:var(--ship-color);cursor:grabbing;box-shadow:0 4px 8px #2ecc714d}.ship-button.placed{opacity:.5;cursor:not-allowed;background:#f5f5f5;border-color:#ddd}.ship-button.dragging{opacity:.5;cursor:grabbing;transform:scale(1.05);box-shadow:0 6px 12px #0003}.action-button.primary{width:100%;padding:1rem;margin-top:2rem;background:#4caf50;color:#fff;border:none;border-radius:6px;font-size:1.1rem;font-weight:600;cursor:pointer;transition:all .2s}.action-button.primary:hover:not(:disabled){background:#45a049;transform:translateY(-2px)}.action-button.primary:disabled{background:#9e9e9e;cursor:not-allowed;opacity:.7}.action-button.primary.loading{position:relative;background:#ff9800}.action-button.primary.loading:after{content:"";position:absolute;width:16px;height:16px;margin:auto;border:2px solid transparent;border-top-color:#fff;border-radius:50%;animation:spin 1s linear infinite;right:10px;top:50%;transform:translateY(-50%)}@keyframes spin{0%{transform:translateY(-50%) rotate(0)}to{transform:translateY(-50%) rotate(360deg)}}@keyframes hit{0%{transform:scale(1)}50%{transform:scale(1.2)}to{transform:scale(1)}}.tile.hit{animation:hit .3s ease-out}@keyframes miss{0%{transform:scale(1)}50%{transform:scale(.8)}to{transform:scale(1)}}.tile.miss{animation:miss .3s ease-out}.game-over{position:fixed;top:0;left:0;right:0;bottom:0;background:#000c;display:flex;justify-content:center;align-items:center;z-index:1000}.game-over-content{background:#fff;padding:2rem;border-radius:12px;text-align:center;max-width:400px;width:90%}.game-over h2{color:var(--primary-color);margin-bottom:1rem}.game-over .action-button{margin-top:1rem}@media (max-width: 768px){.ship-placement-container{flex-direction:column;padding:1rem}.ship-controls{flex:none;width:100%;position:static}.boards-container{flex-direction:column;align-items:center}.board-section{width:100%;max-width:400px}.board{gap:1px;padding:1px}.tile{font-size:1rem}.tile.hit:after{font-size:2rem}.tile.miss:after{font-size:1.5rem}.game-info{flex-direction:column;gap:1rem}.options-container{gap:.5rem}.option{padding:1rem;font-size:1rem}.question-container{padding:1rem;margin:1rem}.test-description{font-size:1rem;padding:1rem}}.powerup-bar{display:flex;justify-content:center;gap:.5rem;margin-top:1rem;margin-bottom:1.2rem;width:100%}.powerup-btn{background:#f8f9fa;border:2px solid var(--secondary-color);color:var(--primary-color);border-radius:6px;padding:.5rem .7rem;font-size:1rem;font-weight:600;cursor:pointer;transition:background .2s,color .2s,border .2s;display:flex;align-items:center;gap:.3rem;position:relative}.powerup-btn .powerup-icon{font-size:1.2em;margin-right:.2em}.powerup-btn .powerup-uses{font-size:.9em;margin-left:.3em;color:#888}.powerup-btn.active,.powerup-btn:focus{background:var(--secondary-color);color:#fff;border-color:var(--primary-color)}.powerup-btn:disabled{opacity:.5;cursor:not-allowed}.powerup-btn:hover:not(:disabled){background:#eaf6fb}.game-mode-selection{display:flex;justify-content:center;gap:2rem;margin:2rem 0}.mode-button{padding:1rem 2rem;font-size:1.2rem;border:none;border-radius:8px;background:var(--secondary-color);color:#fff;cursor:pointer;transition:all .2s}.mode-button:hover{transform:translateY(-2px);box-shadow:0 4px 8px #0000001a}@media (max-width: 768px){.game-mode-selection{flex-direction:column;gap:1rem}.mode-button{width:100%}}.multiplayer-lobby,.lobby-options,.lobby-button,.join-room,#roomCodeInput,.room-info,.players-list,.player,.player-name,.ready-status,.ready-button{display:none}.game-instructions{background-color:#f8f9fa;padding:20px;border-radius:8px;box-shadow:0 2px 4px #0000001a;max-width:600px;margin:0 auto}.start-instructions{background:linear-gradient(135deg,#e74c3c,#c0392b);color:#fff;padding:25px;border-radius:12px;text-align:center;margin-bottom:20px;box-shadow:0 4px 15px #e74c3c4d;animation:pulse 2s infinite}.start-instructions h2{margin:0 0 10px;font-size:1.8rem;font-weight:700}.start-hint{margin:0;font-size:1.1rem;opacity:.9}@keyframes pulse{0%{transform:scale(1)}50%{transform:scale(1.02)}to{transform:scale(1)}}.game-instructions h3{color:#2c3e50;margin-bottom:15px;text-align:center}.game-instructions p{margin:10px 0;color:#34495e;line-height:1.5}.game-instructions ul{list-style:none;padding-left:20px;margin:10px 0}.game-instructions li{margin:8px 0;color:#34495e;display:flex;align-items:center;gap:10px}.game-instructions li:last-child{margin-bottom:15px}.feedback,.question-feedback-msg,.sonar-instructions{display:none!important}@keyframes fadeInOut{0%{opacity:0}to{opacity:0}}.feedback-notification{position:fixed;top:20px;left:50%;transform:translate(-50%);padding:15px 30px;border-radius:8px;font-size:1.2em;font-weight:700;opacity:0;transition:opacity .3s ease-in-out;z-index:1000;pointer-events:none}.feedback-notification.show{opacity:1}.feedback-notification.correct{background-color:#2ecc71e6;color:#fff;box-shadow:0 4px 6px #2ecc7133}.feedback-notification.incorrect{background-color:#e74c3ce6;color:#fff;box-shadow:0 4px 6px #e74c3c33}.direction-control{margin:1rem 0;width:100%}.direction-toggle{background:var(--secondary-color);color:#fff;padding:1rem;border:none;border-radius:8px;cursor:pointer;transition:all .3s ease;font-weight:700;width:100%;text-align:center;display:block;position:relative;z-index:10}.direction-toggle:hover{background:#2980b9;transform:translateY(-2px);box-shadow:0 4px 8px #0003}.direction-toggle.vertical{background:#e74c3c}.direction-toggle.vertical:hover{background:#c0392b}.filters-container{margin:2rem 0;padding:1.5rem;background:#fff;border-radius:12px;box-shadow:0 2px 8px #0000001a}.filters-container h3{margin:0 0 1.5rem;color:var(--primary-color);font-size:1.3rem;font-weight:600}.accordion-filters{display:flex;flex-direction:column;gap:12px}.filter-accordion-card{background-color:#fff;border:1px solid #e9ecef;border-radius:8px;box-shadow:0 2px 4px #0000000d;transition:all .3s ease;overflow:hidden}.filter-accordion-card:hover{box-shadow:0 4px 8px #0000001a}.filter-accordion-card.expanded{border-color:var(--secondary-color)}.accordion-header{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;cursor:pointer;-webkit-user-select:none;user-select:none;background-color:#f8f9fa;transition:background-color .2s}.accordion-header:hover{background-color:#f0f0f0}.accordion-checkbox-label{display:flex;align-items:center;gap:10px;cursor:pointer;flex:1;z-index:1;position:relative}.accordion-checkbox-label input[type=checkbox]{position:absolute;opacity:0;width:0;height:0}.custom-checkbox{width:20px;height:20px;border:2px solid #dee2e6;border-radius:4px;background-color:#fff;position:relative;transition:all .2s ease;flex-shrink:0}.accordion-checkbox-label input[type=checkbox]:checked+.custom-checkbox{background-color:var(--secondary-color);border-color:var(--secondary-color)}.accordion-checkbox-label input[type=checkbox]:checked+.custom-checkbox:after{content:"✓";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);color:#fff;font-size:14px;font-weight:700}.accordion-title{font-size:1.1em;font-weight:600;color:var(--primary-color)}.accordion-controls{display:flex;align-items:center;gap:12px}.filter-count-badge{background-color:var(--secondary-color);color:#fff;padding:4px 10px;border-radius:12px;font-size:.85em;font-weight:600;min-width:24px;text-align:center}.accordion-toggle{background:none;border:none;cursor:pointer;padding:4px;display:flex;align-items:center;justify-content:center;transition:transform .3s ease;color:var(--primary-color)}.filter-accordion-card.expanded .accordion-toggle{transform:rotate(180deg)}.chevron-icon{font-size:.9em;transition:transform .3s ease}.accordion-content{max-height:0;overflow:hidden;transition:max-height .3s ease,padding .3s ease;padding:0 16px}.filter-accordion-card.expanded .accordion-content{max-height:1000px;padding:16px}.category-actions{display:flex;gap:8px;margin-bottom:12px;padding-bottom:12px;border-bottom:1px solid #e9ecef}.select-all-btn,.clear-all-btn{padding:6px 12px;border:1px solid #dee2e6;border-radius:6px;background-color:#fff;color:var(--primary-color);font-size:.85em;font-weight:500;cursor:pointer;transition:all .2s ease}.select-all-btn:hover{background-color:var(--secondary-color);color:#fff;border-color:var(--secondary-color)}.clear-all-btn:hover{background-color:#dc3545;color:#fff;border-color:#dc3545}.filter-options{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:8px}.filter-option{display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:6px;cursor:pointer;transition:all .2s ease;font-size:.9em}.filter-option:hover{background-color:#f8f9fa}.filter-option input[type=checkbox]{position:absolute;opacity:0;width:0;height:0}.custom-checkbox-small{width:18px;height:18px;border:2px solid #dee2e6;border-radius:4px;background-color:#fff;position:relative;transition:all .2s ease;flex-shrink:0}.filter-option input[type=checkbox]:checked+.custom-checkbox-small{background-color:var(--secondary-color);border-color:var(--secondary-color)}.filter-option input[type=checkbox]:checked+.custom-checkbox-small:after{content:"✓";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);color:#fff;font-size:12px;font-weight:700}.filter-option input[type=checkbox]:checked~span{font-weight:600;color:var(--secondary-color)}@media (max-width: 768px){.filters-container{padding:1rem}.accordion-header{padding:12px}.filter-options{grid-template-columns:1fr}.category-actions{flex-direction:column}.select-all-btn,.clear-all-btn{width:100%}}