@import"https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap";:root{--bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);--surface: rgba(30, 41, 59, .7);--surface-border: rgba(255, 255, 255, .1);--primary: #3b82f6;--primary-hover: #2563eb;--secondary: #64748b;--text-main: #f8fafc;--text-muted: #94a3b8;--success: #10b981;--error: #ef4444;--shadow-glow: 0 0 20px rgba(59, 130, 246, .2);--shadow-card: 0 8px 32px rgba(0, 0, 0, .2);--radius-lg: 24px;--radius-md: 16px;--radius-sm: 8px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Outfit,sans-serif;background:var(--bg-gradient);color:var(--text-main);min-height:100vh;display:flex;justify-content:center;align-items:center;padding:2rem;overflow-x:hidden}h1{font-size:2.5rem;font-weight:700;background:linear-gradient(to right,#60a5fa,#a78bfa);-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:.5rem;text-align:center}h2{font-size:1.5rem;font-weight:600;margin-bottom:1rem}h3{font-size:1.2rem;font-weight:500;color:var(--text-muted)}p{line-height:1.6}.app-container{width:100%;max-width:800px;background:var(--surface);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border:1px solid var(--surface-border);border-radius:var(--radius-lg);padding:2.5rem;box-shadow:var(--shadow-card);animation:fadeUp .6s ease-out forwards}@keyframes fadeUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse-light{0%{box-shadow:0 0 #3b82f666}70%{box-shadow:0 0 0 10px #3b82f600}to{box-shadow:0 0 #3b82f600}}@keyframes slideIn{0%{opacity:0;transform:translate(20px)}to{opacity:1;transform:translate(0)}}.btn{background:var(--primary);color:#fff;border:none;padding:1rem 2rem;border-radius:var(--radius-md);font-size:1rem;font-weight:600;font-family:Outfit,sans-serif;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 6px #0000001a;display:inline-flex;align-items:center;justify-content:center;gap:.5rem;width:100%}.btn:hover{background:var(--primary-hover);transform:translateY(-2px);box-shadow:var(--shadow-glow)}.btn:disabled{opacity:.6;cursor:not-allowed;transform:none;box-shadow:none}.options-grid{display:flex;flex-direction:column;gap:1rem;margin-top:2rem}.option-btn{background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.08);border-radius:var(--radius-md);padding:1.25rem 1.5rem;text-align:left;font-size:1rem;color:var(--text-main);cursor:pointer;transition:all .2s ease;font-family:Outfit,sans-serif;display:flex;align-items:center;gap:1rem;position:relative;overflow:hidden}.option-btn:hover{background:rgba(255,255,255,.08);border-color:#fff3;transform:translate(4px)}.option-btn.selected{background:rgba(59,130,246,.15);border-color:var(--primary);box-shadow:inset 0 0 0 1px var(--primary)}.option-btn.selected:before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--primary)}.option-btn.correct{background:rgba(16,185,129,.15);border-color:var(--success)}.option-btn.incorrect{background:rgba(239,68,68,.15);border-color:var(--error)}.option-letter{display:flex;align-items:center;justify-content:center;width:32px;height:32px;background:rgba(255,255,255,.1);border-radius:50%;font-weight:600;font-size:.9rem;flex-shrink:0;transition:all .2s}.option-btn.selected .option-letter{background:var(--primary);color:#fff}.progress-container{width:100%;height:6px;background:rgba(255,255,255,.1);border-radius:4px;margin-bottom:2rem;overflow:hidden}.progress-bar{height:100%;background:linear-gradient(90deg,#60a5fa,#a78bfa);border-radius:4px;transition:width .4s cubic-bezier(.4,0,.2,1)}.explanation-box{margin-top:1.5rem;padding:1.5rem;background:rgba(16,185,129,.05);border:1px solid rgba(16,185,129,.2);border-radius:var(--radius-md);border-left:4px solid var(--success);animation:slideIn .4s ease-out forwards}.explanation-title{display:flex;align-items:center;gap:.5rem;color:var(--success);font-weight:600;margin-bottom:.5rem}.explanation-text{color:var(--text-muted);font-size:.95rem}.start-screen{text-align:center;display:flex;flex-direction:column;align-items:center;gap:1.5rem}.hero-icon{width:80px;height:80px;background:linear-gradient(135deg,rgba(59,130,246,.2),rgba(167,139,250,.2));border-radius:50%;display:flex;align-items:center;justify-content:center;color:#8b5cf6;margin-bottom:1rem;animation:pulse-light 2s infinite}.hero-icon svg{width:40px;height:40px}.badge{background:rgba(255,255,255,.1);padding:.5rem 1rem;border-radius:20px;font-size:.85rem;font-weight:500;color:var(--text-muted)}.result-header{text-align:center;margin-bottom:2rem;padding-bottom:2rem;border-bottom:1px solid var(--surface-border)}.score-circle{width:120px;height:120px;border-radius:50%;background:var(--surface);border:4px solid var(--primary);display:flex;flex-direction:column;align-items:center;justify-content:center;margin:0 auto 1.5rem;box-shadow:var(--shadow-glow)}.score-number{font-size:2.5rem;font-weight:700;color:#fff;line-height:1}.score-label{font-size:.85rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:1px;margin-top:4px}.review-list{display:flex;flex-direction:column;gap:1.5rem}.review-item{background:rgba(0,0,0,.2);border-radius:var(--radius-md);padding:1.5rem;border:1px solid var(--surface-border)}.review-question{font-weight:500;margin-bottom:1rem;font-size:1.1rem}.review-answer{display:flex;align-items:flex-start;gap:.75rem;margin-bottom:.75rem;font-size:.95rem}.review-answer.correct{color:var(--success)}.review-answer.incorrect{color:var(--error)}.review-answer svg{flex-shrink:0;margin-top:2px}.navigation-btns{display:flex;justify-content:flex-end;margin-top:2rem}