.flashcards-container{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:1rem;min-height:100vh}.answer-key-screen{display:flex;flex-direction:column;align-items:center;justify-content:flex-start;text-align:center;padding:2rem 1rem;overflow-y:auto;max-height:100vh}.score{font-size:1.7rem;font-weight:700;color:#2563eb;margin-top:2rem;margin-bottom:1rem;text-align:center}.answer-key p{text-align:center;margin-bottom:1.5rem;line-height:1.6}.flashcard-container{width:90%;max-width:400px;min-height:200px;display:flex;justify-content:center;align-items:center;perspective:1000px;margin-bottom:1rem}.flashcard{background:#fff;border-radius:12px;box-shadow:0 6px 15px #0000001a;display:flex;justify-content:center;align-items:center;font-size:1.5rem;width:100%;height:200px;text-align:center;padding:0 1rem}.input-answer{width:100%;max-width:280px;padding:.8rem;font-size:1rem;border-radius:8px;border:1px solid #ccc;margin:10px auto;display:block}.btn-primary,.btn-submit{display:inline-block;width:100%;max-width:280px;margin:10px auto;padding:.8rem 1.5rem;border-radius:8px;font-size:1rem;border:none;cursor:pointer;transition:background .2s}.btn-primary{background-color:#2563eb;color:#fff}.btn-primary:hover{background-color:#1e40af}.btn-submit{background-color:#16a34a;color:#fff}.btn-submit:hover{background-color:#15803d}.button-group{display:flex;flex-direction:column;align-items:center;gap:10px;margin-top:1rem}@media (max-width: 600px){.flashcard{font-size:1.3rem;height:180px}.input-answer,.btn-primary,.btn-submit{font-size:.95rem;padding:.7rem;max-width:90%}}body{font-family:system-ui,sans-serif;margin:0;padding:0;background:#f9fafb;display:flex;justify-content:center;align-items:center;min-height:100vh}.flashcard-container{display:flex;flex-direction:column;align-items:center;width:100%;max-width:400px;padding:1rem}.flashcard{background-color:#fff;width:100%;min-height:200px;border-radius:12px;box-shadow:0 6px 15px #0000001a;margin:1rem 0;perspective:1000px;cursor:pointer}.flashcard-inner{position:relative;width:100%;height:100%;transition:transform .6s;transform-style:preserve-3d;border-radius:12px}.flashcard-front,.flashcard-back{position:absolute;width:100%;height:100%;backface-visibility:hidden;display:flex;justify-content:center;align-items:center;padding:1rem;font-size:1.5rem;border-radius:12px}.flashcard-back{background-color:#4caf50;color:#fff;transform:rotateY(180deg)}.flashcard.flip .flashcard-inner{transform:rotateY(180deg)}input[type=text]{width:100%;padding:.75rem;font-size:1rem;border:1px solid #d1d5db;border-radius:8px;margin-top:1rem}button{padding:.8rem 1.5rem;font-size:1rem;border-radius:8px;border:none;cursor:pointer;background-color:#2563eb;color:#fff;transition:background .3s}button:hover{background-color:#1e40af}@media (max-width: 600px){.flashcard-front,.flashcard-back{font-size:1.2rem}button{font-size:.95rem;padding:.7rem 1rem}}