.flashcard{perspective:1000px;transition:transform .6s}.flashcard-inner{position:relative;width:100%;height:100%;transition:transform .6s;transform-style:preserve-3d}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-back,.flashcard-front{position:absolute;width:100%;height:100%;backface-visibility:hidden;border-radius:10px;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 8px rgba(0,0,0,.1)}.flashcard-front{background-color:white;z-index:1}.flashcard-back{background-color:#f8f9fa;transform:rotateY(180deg)}.flashcard-deck{transition:all .2s ease;border:1px solid #eaeaea}.flashcard-deck:hover{transform:translateY(-5px);box-shadow:0 10px 20px rgba(0,0,0,.05)}.quiz-option{transition:all .2s ease}.quiz-option:hover{transform:translateY(-2px)}.quiz-option.correct{background-color:#d4edda;border-color:#c3e6cb}.quiz-option.incorrect{background-color:#f8d7da;border-color:#f5c6cb}