.quiz-container{background:#0a1428;min-height:100vh}.question-card{background:#212121;border:1px solid #333;box-shadow:0 8px 32px rgba(0,0,0,.3);color:#ffffff}.option-button{transition:all .3s ease;position:relative;overflow:hidden}.option-button:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,.15)}.option-button:before{content:"";position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.2),transparent);transition:left .5s}.option-button:hover:before{left:100%}.option-correct{background:#10b981;color:white;border-color:#059669;animation:correctPulse .6s ease-in-out}.option-incorrect{background:#ef4444;color:white;border-color:#dc2626;animation:incorrectShake .6s ease-in-out}.option-selected{background:#3b82f6;color:white;border-color:#2563eb}@keyframes correctPulse{0%{transform:scale(1)}50%{transform:scale(1.05)}to{transform:scale(1)}}@keyframes incorrectShake{0%,to{transform:translateX(0)}25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}.progress-bar{background:#3b82f6;border-radius:10px;height:8px;transition:width .5s ease}.explanation-box{background:#1e3a8a;border-left:4px solid #3b82f6;animation:slideIn .5s ease-out;color:#dbeafe}@keyframes slideIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.completion-celebration{animation:celebration 1s ease-in-out}@keyframes celebration{0%{transform:scale(.8);opacity:0}50%{transform:scale(1.1);opacity:1}to{transform:scale(1);opacity:1}}.score-display{background:#3b82f6;color:white;border-radius:15px;padding:2rem;box-shadow:0 10px 25px rgba(59,130,246,.3)}.action-button{transition:all .3s ease;position:relative;overflow:hidden}.action-button:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,0,0,.15)}.action-button:active{transform:translateY(0)}@media (max-width:768px){.question-card{margin:1rem;padding:1.5rem}.option-button{padding:1rem;font-size:.9rem}.score-display{padding:1.5rem}}@media (prefers-color-scheme:dark){.question-card{background:#212121;color:#f9fafb}.explanation-box{background:#1e3a8a;color:#dbeafe}}