:root{--primary-color: #2c3e50;--secondary-color: #3498db;--tertiary-color: #f1c40f;--text-color: #333;--light-color: #ecf0f1;--danger-color: #e74c3c;--success-color: #2ecc71}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;line-height:1.6;color:var(--text-color);background-color:var(--light-color);padding:0;margin:0}header{background-color:var(--primary-color);color:#fff;text-align:center;padding:2rem 1rem;box-shadow:0 2px 5px #0000001a}h1{margin-bottom:.5rem;font-size:2.5rem}.container{max-width:1200px;margin:0 auto;padding:2rem 1rem}.controls{display:flex;justify-content:center;margin:2rem 0;flex-wrap:wrap;gap:1rem}.btn{padding:.75rem 1.5rem;background-color:var(--secondary-color);color:#fff;border:none;border-radius:4px;cursor:pointer;font-size:1rem;transition:background-color .3s,transform .2s}.btn:hover:not(:disabled){background-color:#2980b9;transform:translateY(-2px)}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-warning{background-color:var(--tertiary-color);color:var(--text-color)}.btn-warning:hover:not(:disabled){background-color:#f39c12}.btn-danger{background-color:var(--danger-color)}.btn-danger:hover:not(:disabled){background-color:#c0392b}.btn-success{background-color:var(--success-color)}.btn-success:hover:not(:disabled){background-color:#27ae60}.flashcard-container{perspective:1000px;margin:0 auto;max-width:800px;height:400px}.flashcard{width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform .6s;border-radius:10px;box-shadow:0 10px 20px #0003;cursor:pointer}.flashcard.flipped{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{position:absolute;width:100%;height:100%;backface-visibility:hidden;border-radius:10px;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:2rem;text-align:center}.flashcard-front{background-color:#fff;color:var(--primary-color);border:2px solid var(--secondary-color)}.flashcard-back{background-color:var(--secondary-color);color:#fff;transform:rotateY(180deg);overflow-y:auto}.category{position:absolute;top:1rem;left:1rem;font-size:.9rem;background-color:var(--tertiary-color);color:var(--text-color);padding:.25rem .5rem;border-radius:4px}.flashcard-question{font-size:1.5rem;margin-bottom:1rem;line-height:1.4}.flashcard-answer{font-size:1.3rem;line-height:1.4}.counter{margin:1.5rem 0;font-size:1.1rem;color:var(--text-color);text-align:center}.progress-container{width:100%;max-width:800px;margin:1.5rem auto;background-color:#ddd;border-radius:10px;height:10px}.progress-bar{height:10px;background-color:var(--success-color);border-radius:10px;width:0%;transition:width .3s ease}.category-filters{display:flex;justify-content:center;margin:1rem 0;flex-wrap:wrap;gap:.5rem}.category-btn{padding:.5rem 1rem;border:1px solid var(--secondary-color);background-color:#fff;border-radius:4px;cursor:pointer;font-size:.9rem;transition:all .3s}.category-btn.active{background-color:var(--secondary-color);color:#fff}.category-btn:disabled{opacity:.5;cursor:not-allowed}footer{text-align:center;padding:2rem;background-color:var(--primary-color);color:#fff;margin-top:2rem}.view-header,.all-cards-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem;flex-wrap:wrap;gap:1rem}.view-header h2,.all-cards-header h2{margin:0;color:var(--primary-color)}.view-actions{display:flex;gap:1rem;flex-wrap:wrap}.search-container{margin-bottom:1.5rem;width:100%}.search-input{width:100%;padding:.75rem;border:1px solid #ddd;border-radius:4px;font-size:1rem;transition:border-color .3s}.search-input:focus{outline:none;border-color:var(--secondary-color)}.all-cards-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:2rem;margin-top:2rem}.card{background-color:#fff;border-radius:8px;box-shadow:0 2px 8px #0000001a;overflow:hidden;transition:transform .3s,box-shadow .3s}.card:hover{transform:translateY(-5px);box-shadow:0 5px 15px #00000026}.card-header{padding:.75rem;background-color:var(--light-color);border-bottom:1px solid #ddd}.category-badge{display:inline-block;background-color:var(--tertiary-color);color:var(--text-color);padding:.25rem .5rem;border-radius:20px;font-size:.85rem}.card-content{padding:1.5rem}.card-content h3{color:var(--primary-color);margin-top:0;margin-bottom:.5rem;font-size:1.1rem}.card-content p{margin-bottom:1.5rem}.no-results{text-align:center;padding:2rem;background-color:#fff;border-radius:8px;box-shadow:0 2px 8px #0000001a;margin-top:2rem}@media (max-width: 768px){h1{font-size:2rem}.flashcard-container{height:300px}.flashcard-question{font-size:1.3rem}.flashcard-answer{font-size:1.1rem}.controls{flex-direction:column;align-items:center}.btn{width:100%;max-width:300px}.view-header,.all-cards-header{flex-direction:column;align-items:flex-start}.view-actions{width:100%}.view-actions .btn{flex-grow:1}.all-cards-grid{grid-template-columns:1fr}}@media (max-width: 480px){.flashcard-container{height:250px}.category-filters{flex-direction:column;align-items:center}.category-btn{width:100%;max-width:300px}}.menu-container{max-width:1200px;margin:2rem auto;padding:1rem}.menu-container h2{text-align:center;margin-bottom:2rem;color:var(--primary-color)}.subjects-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:2rem}.subject-card{background-color:#fff;border-radius:10px;box-shadow:0 4px 10px #0000001a;padding:1.5rem;text-decoration:none;color:var(--text-color);transition:transform .3s,box-shadow .3s;display:flex;flex-direction:column;height:100%;border:2px solid transparent}.subject-card:hover{transform:translateY(-5px);box-shadow:0 6px 15px #00000026;border-color:var(--secondary-color)}.subject-icon{font-size:2.5rem;margin-bottom:1rem;color:var(--secondary-color);text-align:center}.subject-card h3{margin-bottom:.5rem;color:var(--primary-color)}.subject-card p{flex-grow:1;color:#666;margin-bottom:1rem}.card-count{display:inline-block;background-color:var(--tertiary-color);color:var(--text-color);padding:.25rem .5rem;border-radius:20px;font-size:.85rem;align-self:flex-start}@media (max-width: 768px){.subjects-grid{grid-template-columns:1fr}}:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{margin:0;padding:0;min-width:320px;min-height:100vh}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media (prefers-color-scheme: light){:root{color:#213547;background-color:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}