.quiz-view{opacity:1;max-width:800px;margin:0 auto;transition:opacity .4s,transform .4s cubic-bezier(.4,0,.2,1);transform:translateY(0)}.quiz-view.hidden{opacity:0;transform:translateY(20px);display:none!important}.mode-btn{border:2px solid var(--border);cursor:pointer;text-align:left;background:#fff;border-radius:12px;flex-direction:column;gap:.25rem;padding:1.25rem;transition:all .3s cubic-bezier(.4,0,.2,1);display:flex;position:relative;overflow:hidden}.mode-btn:hover{border-color:var(--text);background:var(--bg);transform:translateY(-4px);box-shadow:0 12px 24px #0000000d}.mode-btn:active{transform:translateY(-2px)}.mode-btn:after{content:"";pointer-events:none;background:linear-gradient(135deg,#ffffff1a 0%,#fff0 100%);width:100%;height:100%;position:absolute;top:0;left:0}@media (width<=700px){#mode-selector{grid-template-columns:1fr 1fr!important}}@media (width<=420px){#mode-selector{grid-template-columns:1fr!important}}.difficulty-badge{text-transform:uppercase;border-radius:12px;margin-top:-.5rem;margin-bottom:1rem;padding:.25rem .75rem;font-size:.75rem;font-weight:700;display:inline-block}.difficulty-easy{color:#166534;background:#dcfce7}.difficulty-medium{color:#92400e;background:#fed7aa}.difficulty-hard{color:#991b1b;background:#fee2e2}.difficulty-extremely_hard{color:#6b21a8;background:#e9d5ff}.option-btn{border:2px solid var(--border,#e5e7eb);cursor:pointer;text-align:left;background:#fff;border-radius:8px;align-items:center;gap:1rem;width:100%;padding:1.25rem;font-size:1rem;transition:all .2s;display:flex}.option-btn:hover:not(:disabled){border-color:var(--text,#333);background:var(--gray-light,#f9f9f9)}.option-btn:disabled{cursor:default}.option-letter{border:2px solid var(--border,#e5e7eb);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:32px;height:32px;font-size:.875rem;font-weight:700;transition:all .2s;display:flex}.option-btn.correct .option-letter{color:#fff;background:#10b981;border-color:#10b981}.option-btn.correct{background:#ecfdf5;border-color:#10b981}.option-btn.wrong .option-letter{color:#fff;background:#ef4444;border-color:#ef4444}.option-btn.wrong{background:#fef2f2;border-color:#ef4444}#feedback{animation:.3s slideUp}@keyframes slideUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes confetti{0%{opacity:1;transform:translateY(0)rotate(0)}to{opacity:0;transform:translateY(800px)rotate(720deg)}}.confetti-piece{pointer-events:none;border-radius:50%;width:10px;height:10px;position:fixed}