.nav-tabs{display:flex;gap:10px;margin-bottom:20px;border-bottom:2px solid #009e08;padding-bottom:10px}.tab-btn{padding:10px 20px;font-size:16px;background-color:#555;color:#fff;border:none;cursor:pointer;border-radius:5px;transition:background-color .3s}.tab-btn:hover{background-color:#666}.tab-btn.active{background-color:#009e08}.tab-content{display:none}.tab-content.active{display:block}.flashcard-setup{background-color:#222;padding:20px;border-radius:10px;margin-bottom:20px;border:1px solid #009e08}.setup-group{margin-bottom:15px;display:flex;flex-direction:column}.setup-group label{margin-bottom:5px;color:#009e08;font-weight:700}.setup-group input[type=file],.setup-group input[type=number],.setup-group textarea{padding:10px;border:1px solid #009e08;background-color:#111;color:#fff;border-radius:5px;font-family:Arial,sans-serif}.setup-group textarea{resize:vertical;min-height:120px}.setup-group input[type=file]::file-selector-button{padding:8px 15px;background-color:#009e08;color:#fff;border:none;border-radius:5px;cursor:pointer;margin-right:10px}.secondary-btn{background-color:#444!important;margin-right:10px;margin-bottom:10px}.secondary-btn:hover{background-color:#555!important}.message{padding:10px;margin-bottom:10px;border-radius:5px;display:none;font-weight:700}.message.success{background-color:#4caf50;color:#fff}.message.error{background-color:#f44336;color:#fff}.message.info{background-color:#2196f3;color:#fff}#flashcard-container{background-color:#000;padding:20px;border-radius:10px}.flashcard-header{text-align:center;margin-bottom:20px;color:#fff}.flashcard-header h2{margin:0 0 10px;color:#009e08}#progress{color:#009e08;font-size:14px}#score-display{color:#fff;font-size:16px;margin:10px 0}#flashcard{width:100%;max-width:500px;height:300px;margin:30px auto;cursor:pointer;perspective:1000px}.flashcard-inner{width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform .6s}#flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{position:absolute;width:100%;height:100%;backface-visibility:hidden;display:flex;align-items:center;justify-content:center;padding:20px;box-sizing:border-box;border-radius:10px;font-size:18px;font-weight:700;text-align:center;line-height:1.5;word-wrap:break-word}.flashcard-hint{text-align:center;color:#999;font-size:12px;margin-bottom:20px}#game-tiles{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:20px}.tile{width:100px;height:100px;perspective:80px}.tile-inner{width:100%;height:100%;position:relative;transform-style:preserve-3d;transition:transform .6s}.tile.flipped .tile-inner{transform:rotateY(180deg)}.tile-front,.tile-back{position:absolute;width:100%;height:100%;backface-visibility:hidden;display:flex;align-items:center;justify-content:center;border-radius:8px}.tile-front{background-color:#333}.tile-back{background-size:cover;background-position:center;transform:rotateY(180deg)}.header{display:flex;flex-direction:column;justify-content:space-between;align-items:center;margin-bottom:20px}.game-container{display:flex;flex-direction:column;align-items:center;background-color:#000;padding:20px;border-radius:10px}.app-footer{text-align:center;padding:15px 0;color:#666;font-size:14px;margin-top:30px}#root{max-width:1280px;margin:0 auto;text-align:center}.demo-toggle{padding:20px 0;display:flex;justify-content:center}.hide-demo-btn{padding:10px 20px;background-color:#667eea;color:#fff;border:none;border-radius:6px;cursor:pointer;font-size:1rem;font-weight:600;transition:all .3s}.hide-demo-btn:hover{background-color:#5568d3;transform:translateY(-2px);box-shadow:0 4px 10px #667eea66}.logo{height:6em;padding:1.5em;will-change:filter;transition:filter .3s}.logo:hover{filter:drop-shadow(0 0 2em #646cffaa)}.logo.react:hover{filter:drop-shadow(0 0 2em #61dafbaa)}@keyframes logo-spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@media(prefers-reduced-motion:no-preference){a:nth-of-type(2) .logo{animation:logo-spin infinite 20s linear}}.card{padding:2em}.read-the-docs{color:#888}.memory-game-container{padding:20px;max-width:800px;margin:0 auto}.game-header h2{margin:0;font-size:2rem}.score-display{font-size:1.5rem;font-weight:700;color:#333}.start-btn,.reset-btn{padding:15px 30px;font-size:1.2rem;background-color:#4caf50;color:#fff;border:none;border-radius:8px;cursor:pointer;transition:background-color .3s}.start-btn:hover,.reset-btn:hover{background-color:#45a049}.tiles-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:15px;margin-top:20px}.tile{aspect-ratio:1;position:relative;cursor:pointer;perspective:1000px;transition:transform .2s}.tile:hover{transform:scale(1.05)}.tile-front,.tile-back{width:100%;height:100%;backface-visibility:hidden;transition:transform .6s;border-radius:8px}.tile-front{background:linear-gradient(135deg,#667eea,#764ba2);display:flex;align-items:center;justify-content:center;font-size:2rem;transform:rotateY(0)}.tile-front:after{content:"";position:absolute;background-image:url(/images/question.svg);background-repeat:no-repeat;background-position:center;top:50%;left:50%;transform:translate(-50%,-50%);width:80%;height:80%;box-shadow:5px 5px 6px #000}.tile-back{display:flex;align-items:center;justify-content:center;background-size:cover;background-position:center;transform:rotateY(-180deg);box-shadow:0 4px 8px #0003}.game-over{text-align:center;margin-top:30px;padding:20px;background-color:#f0f0f0;border-radius:10px}.game-over h3{font-size:2rem;margin-bottom:15px;color:#4caf50}@media(max-width:600px){.tiles-grid{grid-template-columns:repeat(3,1fr);gap:10px}}body{font-family:Arial,sans-serif;background-color:#0d0023;color:#fff;margin:0;padding:0}.flashcard-system{max-width:900px;margin:0 auto;padding:5px;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;font-size:16px}.message{padding:15px;border-radius:8px;margin-bottom:20px;font-weight:500;animation:slideIn .3s ease-out}.message.success{background-color:#d4edda;color:#155724;border:1px solid #c3e6cb}.message.error{background-color:#f8d7da;color:#721c24;border:1px solid #f5c6cb}.message.info{background-color:#d1ecf1;color:#0c5460;border:1px solid #bee5eb}@keyframes slideIn{0%{transform:translateY(-20px);opacity:0}to{transform:translateY(0);opacity:1}}.flashcard-setup{background:linear-gradient(135deg,#667eea,#764ba2);padding:30px;border-radius:12px;color:#fff;margin-bottom:30px;box-shadow:0 4px 15px #0000001a}.flashcard-setup h2{margin-top:0;margin-bottom:20px;font-size:2rem}.input-group{padding-top:10px;margin-bottom:20px}.input-group label{display:block;margin-bottom:8px;font-weight:600;font-size:1.5rem}.input-group input[type=file],.input-group input[type=number],.input-group textarea{width:100%;padding:12px;border:none;border-radius:6px;font-size:1rem;font-family:inherit;box-sizing:border-box}.input-group textarea{resize:vertical;font-family:Courier New,monospace}.input-group input[type=number]{max-width:150px}.radio-options{display:flex;flex-direction:row;justify-content:space-evenly;gap:10px;margin-top:10px}.radio-label{display:flex;gap:8px;cursor:pointer;font-weight:500}.radio-label input[type=radio]{cursor:pointer;width:22px;height:22px;accent-color:#15f5d3}.radio-label span{font-size:1.7rem;padding-top:0}.generate-btn,.generate-test{width:100%;padding:15px;background-color:#7dc0d8;color:#420092;border:none;border-radius:6px;font-size:1.5rem;font-weight:600;cursor:pointer;transition:all .3s;margin-top:10px;letter-spacing:1.1px}.generate-btn:hover:not(:disabled),.generate-test:hover:not(:disabled){background-color:#52daa6;transform:translateY(-2px);box-shadow:5px 6px #000}.generate-btn:disabled,.generate-test:disabled{background-color:#ccc;cursor:not-allowed;opacity:.6}.flashcard-container{background:linear-gradient(135deg,#667eea,#764ba2);padding:30px;border-radius:12px;box-shadow:0 4px 15px #0000001a;border:1px solid #4f00b5}.progress{text-align:center;font-size:1.3rem;color:#bebebe;margin-bottom:20px;font-weight:600}.flashcard{position:relative;width:100%;height:400px;perspective:1000px;cursor:pointer;margin-bottom:30px}.flashcard-front,.flashcard-back{position:absolute;width:100%;height:100%;backface-visibility:hidden;display:flex;align-items:center;justify-content:center;border-radius:12px;padding:30px;box-sizing:border-box;font-size:2.5rem;font-weight:500;text-align:center;transition:transform .6s;line-height:1.6}.flashcard-front{background:#1d0036;color:#fff;transform:rotateY(0)}.flashcard-front:before{content:"Click to reveal answer";position:absolute;bottom:20px;font-size:.9rem;opacity:.8;font-weight:400}.flashcard-back{background:purple;color:#fff;transform:rotateY(180deg)}.flashcard.flipped .flashcard-front{transform:rotateY(180deg)}.flashcard.flipped .flashcard-back{transform:rotateY(0)}.nav-buttons{display:flex;gap:15px;margin-bottom:20px;justify-content:center}.nav-btn{padding:12px 30px;background-color:#667eea;color:#fff;border:none;border-radius:6px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s}.nav-btn:hover:not(:disabled){background-color:#5568d3;transform:translateY(-2px);box-shadow:0 4px 10px #667eea66}.nav-btn:disabled{background-color:#ccc;cursor:not-allowed;opacity:.5}.flashcard-controls{display:flex;gap:15px;justify-content:center;margin-bottom:20px}.correct-btn,.incorrect-btn{padding:12px 30px;border:none;border-radius:6px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s;flex:1;max-width:200px}.correct-btn{background-color:#4caf50;color:#fff}.correct-btn:hover{background-color:#45a049;transform:translateY(-2px);box-shadow:0 4px 10px #4caf5066}.incorrect-btn{background-color:#f44336;color:#fff}.incorrect-btn:hover{background-color:#da190b;transform:translateY(-2px);box-shadow:0 4px 10px #f4433666}.score-display{text-align:center;font-size:1.3rem;font-weight:700;color:#667eea;padding:15px;background-color:#f5f5f5;border-radius:6px;margin-bottom:20px}.action-buttons{display:flex;gap:15px;justify-content:center;flex-wrap:wrap}#pdf-upload,.review-btn,.export-btn,.import-btn{padding:12px 25px;border:2px solid #667eea;background-image:linear-gradient(180deg,#667eea,#764ba2,#667eea);color:#c2ccf6;border-radius:6px;font-size:1.5rem;font-weight:600;cursor:pointer;transition:all .3s;box-shadow:3px 3px 6px #051040}.review-btn:hover,.export-btn:hover,.import-btn:hover{background-color:#31007a;color:#fff;transform:translateY(-2px);box-shadow:0 4px 10px #667eea66}.review-btn.active{background-color:#667eea;color:#fff}.import-btn{display:inline-flex;align-items:center;justify-content:center}.matching-game-container{background:#fff;padding:10px;border-radius:12px;box-shadow:0 4px 15px #0000001a}.game-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.game-header h2{margin:0;color:#333}.exit-game-btn{padding:10px 20px;background-color:#f44336;color:#fff;border:none;border-radius:6px;cursor:pointer;font-size:1rem;font-weight:600;transition:all .3s}.exit-game-btn:hover{background-color:#d32f2f;transform:translateY(-2px)}.score-display{text-align:center;font-size:1.3rem;color:#667eea;margin-bottom:20px;font-weight:600}.tiles-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:15px;margin-bottom:30px}.tile{position:relative;width:100%;aspect-ratio:1;perspective:1000px;cursor:pointer;border-radius:8px;overflow:hidden;min-height:140px}.tile-front,.tile-back{position:absolute;width:100%;height:100%;display:flex;align-items:center;justify-content:center;transition:transform .6s;backface-visibility:hidden;border-radius:8px;text-align:center;padding:12px;box-sizing:border-box;font-size:clamp(.75rem,2vw,1rem);font-weight:600;line-height:1.3;word-wrap:break-word;overflow-wrap:break-word;-webkit-hyphens:auto;hyphens:auto}.tile-front{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;transform:rotateY(0)}.tile-back{background-color:#ece7ff;color:#333;transform:rotateY(180deg)}.tile.flipped .tile-front{transform:rotateY(180deg)}.tile.flipped .tile-back{transform:rotateY(0)}.game-over{text-align:center;padding:30px;background:linear-gradient(135deg,#667eea,#764ba2);border-radius:12px;color:#fff}.game-over h3{margin:0 0 20px;font-size:2rem}.reset-btn,.exit-btn{padding:12px 24px;margin:0 10px;background-color:#fff;color:#667eea;border:none;border-radius:6px;cursor:pointer;font-weight:600;font-size:2rem;transition:all .3s}.reset-btn:hover,.exit-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0003}.print-results-btn{padding:12px 20px;background-color:#4caf50;color:#fff;border:none;border-radius:6px;cursor:pointer;font-weight:600;margin-right:10px}.test-actions{display:flex;gap:10px;justify-content:center;margin-top:15px}.print-area{display:none}.review-results-btn{padding:12px 20px;background-color:#7dc0d8;color:#1a1440;border:none;border-radius:6px;cursor:pointer;font-weight:600}.review-results{background:#fff;color:#222;border-radius:10px;padding:20px;margin-top:20px;box-shadow:0 4px 12px #00000026}.review-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.review-questions{list-style:decimal;padding-left:20px}.review-question{margin-bottom:14px}.review-answers{list-style:disc;padding-left:20px}.review-answer{margin:4px 0;padding:6px 8px;border-radius:6px}.review-answer.correct{background:#e8f5e9;color:#2e7d32}.review-answer.selected-wrong{background:#ffebee;color:#c62828}.review-answer.selected-correct{background:#e3f2fd;color:#1565c0}.review-score{font-weight:700}.answer-text{word-break:break-word}.badge{margin-left:8px;font-size:.85rem}.badge.chosen-correct{color:#1565c0;font-weight:700}.print-area h1{margin-bottom:10px}.print-meta{display:flex;justify-content:space-between;margin-bottom:20px;font-size:.95rem}.print-questions{list-style:decimal;padding-left:20px}.print-question{margin-bottom:16px}.q-text{font-weight:600;margin-bottom:6px}.print-answers{list-style:disc;padding-left:20px}.answer{margin:4px 0}.answer .badge{margin-left:8px;font-size:.85rem}.badge.correct{color:#2e7d32;font-weight:700}.badge.chosen{color:#c62828;font-weight:700}.badge.chosen-correct{color:#2e7d32;font-weight:700}@media print{body *{visibility:hidden}.print-area,.print-area *{visibility:visible}.print-area{display:block;position:absolute;left:0;top:0;width:100%;color:#000;background:#fff;padding:24px;box-sizing:border-box;font-size:12pt}.print-question{page-break-inside:avoid}}@media(max-width:768px){.flashcard-system{padding:15px}.flashcard-setup{padding:20px}.flashcard-setup h2{font-size:1.5rem}.flashcard{height:300px}.flashcard-front,.flashcard-back{padding:20px}.tiles-grid{grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:12px}.tile{min-height:120px}.flashcard-controls{flex-direction:column}.correct-btn,.incorrect-btn{max-width:100%}.action-buttons{flex-direction:column}.review-btn,.export-btn,.import-btn{width:100%}.nav-buttons{flex-direction:column}.nav-btn{width:100%}}@media(max-width:480px){.flashcard{height:250px}.flashcard-front,.flashcard-back{padding:15px;font-size:2rem}.flashcard-setup h2{font-size:1.3rem}.tiles-grid{grid-template-columns:repeat(auto-fit,minmax(100px,1fr));gap:10px}.tile{min-height:100px}.tile-front,.tile-back{font-size:clamp(.65rem,1.5vw,.9rem);padding:10px}}.test-container{background:linear-gradient(135deg,#667eea,#764ba2);padding:30px;border-radius:12px;box-shadow:0 4px 15px #0000001a;border:1px solid #4f00b5;color:#fff;margin-bottom:30px}.answer-section{margin-top:20px;text-align:center;display:flex;flex-wrap:wrap;gap:25px;justify-content:center}.answer-btn{display:flex;flex-direction:row;justify-content:center;padding:20px;background-color:#15f5d3;border-radius:10px;font-size:1.2rem;font-weight:600;width:45%;height:auto;cursor:pointer}.answer-btn:hover{background-color:#a6fff2;transform:translateY(-2px);box-shadow:5px 4px 10px #0006}.test-results{text-align:center;font-size:1.5rem;font-weight:700;margin-top:20px}