:root{--bg-primary:#0a0a1a;--bg-secondary:#12122a;--bg-card:#1a1a3e;--bg-hover:#252560;--accent:#7C36CE;--accent-light:#9B59E8;--accent-glow:rgba(124,54,206,0.3);--text-primary:#f0f0ff;--text-secondary:#a0a0cc;--text-muted:#6a6a99;--success:#22c55e;--error:#ef4444;--warning:#f59e0b;--border:#2a2a55;--radius:12px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg-primary);color:var(--text-primary);min-height:100vh;line-height:1.6}a{color:var(--accent-light);text-decoration:none}.container{max-width:900px;margin:0 auto;padding:20px}.header{text-align:center;padding:40px 20px 20px}.header h1{font-size:2rem;background:linear-gradient(135deg,var(--accent-light),var(--accent),#ff6b9d);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:8px}.header p{color:var(--text-secondary);font-size:.95rem}.exam-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));grid-gap:16px;gap:16px;margin-top:30px}.exam-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;cursor:pointer;transition:all .3s ease;position:relative;overflow:hidden}.exam-card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--accent),var(--accent-light));opacity:0;transition:opacity .3s}.exam-card:hover{transform:translateY(-4px);border-color:var(--accent);box-shadow:0 8px 30px var(--accent-glow)}.exam-card:hover:before{opacity:1}.exam-card .exam-number{font-size:2.5rem;font-weight:800;color:var(--accent);line-height:1;margin-bottom:8px}.exam-card .exam-title{font-size:1.1rem;font-weight:600;margin-bottom:12px}.exam-card .exam-info{display:flex;gap:16px;color:var(--text-secondary);font-size:.85rem}.exam-card .exam-info span{display:flex;align-items:center;gap:4px}.quiz-header{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;background:var(--bg-secondary);border-radius:var(--radius);margin-bottom:20px;border:1px solid var(--border);position:-webkit-sticky;position:sticky;top:10px;z-index:100;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.timer{font-size:1.4rem;font-weight:700;font-feature-settings:"tnum";font-variant-numeric:tabular-nums;color:var(--text-primary)}.timer.warning{color:var(--warning);animation:pulse 1s infinite}.timer.danger{color:var(--error);animation:pulse .5s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.progress-text{color:var(--text-secondary);font-size:.9rem}.btn-submit{background:linear-gradient(135deg,var(--accent),var(--accent-light));color:white;border:none;padding:10px 24px;border-radius:8px;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .3s}.btn-submit:hover{transform:scale(1.05);box-shadow:0 4px 15px var(--accent-glow)}.question-nav{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:24px;padding:16px;background:var(--bg-secondary);border-radius:var(--radius);border:1px solid var(--border)}.nav-btn{width:40px;height:40px;border-radius:8px;border:1px solid var(--border);background:var(--bg-card);color:var(--text-secondary);font-size:.85rem;font-weight:600;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center}.nav-btn:hover{border-color:var(--accent);color:var(--text-primary)}.nav-btn.answered{background:var(--accent);border-color:var(--accent);color:white}.nav-btn.flagged{border-color:var(--warning);box-shadow:0 0 0 2px rgba(245,158,11,.3)}.nav-btn.current{border-color:var(--accent-light);box-shadow:0 0 0 2px var(--accent-glow)}.question-card{background:var(--bg-card);border-radius:var(--radius);padding:28px;margin-bottom:20px;border:1px solid var(--border);transition:all .3s}.question-card .q-number{font-size:.8rem;color:var(--accent-light);font-weight:600;text-transform:uppercase;letter-spacing:1px;margin-bottom:8px}.question-card .q-text{font-size:1.05rem;font-weight:500;margin-bottom:20px;line-height:1.7}.option-list{display:flex;flex-direction:column;gap:10px}.option-item{display:flex;align-items:flex-start;gap:12px;padding:14px 16px;border-radius:10px;border:1px solid var(--border);cursor:pointer;transition:all .2s;background:transparent}.option-item:hover{background:var(--bg-hover);border-color:var(--accent)}.option-item.selected{background:rgba(124,54,206,.15);border-color:var(--accent)}.option-item .option-letter{min-width:32px;height:32px;border-radius:50%;background:var(--bg-secondary);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.85rem;flex-shrink:0;transition:all .2s}.option-item.selected .option-letter{background:var(--accent);color:white}.option-item .option-text{padding-top:4px;font-size:.95rem;line-height:1.5}.flag-btn{background:transparent;border:1px solid var(--border);color:var(--text-secondary);padding:8px 16px;border-radius:8px;cursor:pointer;font-size:.85rem;transition:all .2s;display:flex;align-items:center;gap:6px;margin-top:12px}.flag-btn.flagged,.flag-btn:hover{border-color:var(--warning);color:var(--warning)}.flag-btn.flagged{background:rgba(245,158,11,.1)}.result-header{text-align:center;padding:40px 20px}.score-circle{width:160px;height:160px;border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;margin:0 auto 20px;border:4px solid var(--accent);background:rgba(124,54,206,.1)}.score-circle .score-num{font-size:3rem;font-weight:800;color:var(--accent-light);line-height:1}.score-circle .score-label{font-size:.8rem;color:var(--text-secondary);margin-top:4px}.result-stats{display:flex;justify-content:center;gap:30px;margin:20px 0}.stat-item{text-align:center}.stat-item .stat-value{font-size:1.5rem;font-weight:700}.stat-item .stat-label{font-size:.8rem;color:var(--text-secondary)}.stat-item.correct .stat-value{color:var(--success)}.stat-item.wrong .stat-value{color:var(--error)}.stat-item.unanswered .stat-value{color:var(--text-muted)}.review-card{background:var(--bg-card);border-radius:var(--radius);padding:24px;margin-bottom:16px;border:1px solid var(--border)}.review-card.correct{border-left:4px solid var(--success)}.review-card.wrong{border-left:4px solid var(--error)}.review-card.unanswered{border-left:4px solid var(--text-muted)}.review-card .review-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.review-card .q-num{font-weight:700;color:var(--accent-light)}.review-card .badge{padding:4px 12px;border-radius:20px;font-size:.75rem;font-weight:600}.badge-correct{background:rgba(34,197,94,.2);color:var(--success)}.badge-wrong{background:rgba(239,68,68,.2);color:var(--error)}.badge-unanswered{background:rgba(106,106,153,.2);color:var(--text-muted)}.review-option{padding:10px 14px;border-radius:8px;margin:6px 0;font-size:.9rem;line-height:1.5}.review-option.correct-answer{background:rgba(34,197,94,.1);border:1px solid rgba(34,197,94,.3);color:var(--success)}.review-option.user-wrong{background:rgba(239,68,68,.1);border:1px solid rgba(239,68,68,.3);color:var(--error)}.review-option.neutral{color:var(--text-secondary)}.btn{padding:12px 28px;border-radius:8px;font-weight:600;font-size:.95rem;cursor:pointer;transition:all .3s;border:none}.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-light));color:white}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px var(--accent-glow)}.btn-secondary{background:var(--bg-card);color:var(--text-primary);border:1px solid var(--border)}.btn-secondary:hover{border-color:var(--accent)}.btn-group{gap:12px;margin-top:30px;flex-wrap:wrap}.btn-group,.modal-overlay{display:flex;justify-content:center}.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.7);align-items:center;z-index:1000;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.modal{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:32px;max-width:420px;width:90%;text-align:center}.modal h3{font-size:1.3rem;margin-bottom:12px}.modal p{color:var(--text-secondary);margin-bottom:24px;line-height:1.6}@media (max-width:640px){.header h1{font-size:1.5rem}.quiz-header{flex-wrap:wrap;gap:10px}.question-card{padding:20px}.exam-grid{grid-template-columns:1fr}.result-stats{flex-direction:column;gap:10px}}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn .3s ease-out}