:root{--primary:#6366f1;--primary-hover:#4f46e5;--surface:#ffffffd9;--surface-dark:#fffffff2;--text-main:#1f2937;--text-muted:#4b5563;--bg-gradient:linear-gradient(135deg, #e0e7ff 0%, #c7d2fe 100%);--success:#059669;--error:#dc2626;--shadow-sm:0 4px 6px -1px #0000001a, 0 2px 4px -1px #0000000f;--shadow-md:0 10px 15px -3px #0000001a, 0 4px 6px -2px #0000000d;--shadow-lg:0 20px 25px -5px #0000001a, 0 10px 10px -5px #0000000a;--card-bg:#fff}@media (prefers-color-scheme:dark){:root{--surface:#0f172ad9;--surface-dark:#020617f2;--text-main:#f8fafc;--text-muted:#94a3b8;--bg-gradient:linear-gradient(135deg, #0f172a 0%, #1e293b 100%);--card-bg:#1e293b;--success:#34d399;--error:#f87171}.wrong-answer-card,.option-btn{background:var(--card-bg)!important;border-color:#334155!important}.option-letter{color:var(--text-muted)!important;background:#334155!important}.option-btn:hover:not(:disabled){background:#334155!important}.option-btn.selected,.option-btn.correct,.option-btn.wrong,.btn-primary:not([style*=background]){color:#fff!important}.confusion-hint{color:#fbbf24!important;background-color:#f59e0b1a!important;border-color:#f59e0b!important}}*{box-sizing:border-box;margin:0;padding:0;font-family:Inter,system-ui,-apple-system,sans-serif}body{background:var(--bg-gradient);color:var(--text-main);-webkit-font-smoothing:antialiased;justify-content:center;align-items:center;min-height:100vh;display:flex}#root{width:100%;max-width:850px;padding:20px;transition:max-width .4s cubic-bezier(.4,0,.2,1)}#root.wide-mode{max-width:1400px}@media (width>=1400px){#root:not(.wide-mode){max-width:950px}}.glass-panel{background:var(--surface);-webkit-backdrop-filter:blur(12px);box-shadow:var(--shadow-lg);border:1px solid #ffffff4d;border-radius:24px;padding:40px;animation:.5s ease-out fadeIn}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}h1.title{text-align:center;-webkit-text-fill-color:transparent;background:linear-gradient(90deg,#4f46e5,#7c3aed);-webkit-background-clip:text;background-clip:text;margin-bottom:20px;font-size:2.5rem;font-weight:700}p.subtitle{text-align:center;color:var(--text-muted);margin-bottom:40px;font-size:1.1rem;line-height:1.6}.btn-primary{background:var(--primary);color:#fff;cursor:pointer;width:100%;box-shadow:var(--shadow-sm);border:none;border-radius:12px;padding:16px 32px;font-size:1.1rem;font-weight:600;transition:all .2s}.btn-primary:hover{background:var(--primary-hover);box-shadow:var(--shadow-md);transform:translateY(-2px)}.btn-primary:active{transform:translateY(0)}.progress-container{color:var(--primary);justify-content:space-between;align-items:center;margin-bottom:30px;font-weight:600;display:flex}.progress-bar-bg{background:#6366f133;border-radius:4px;flex-grow:1;height:8px;margin:0 20px;overflow:hidden}.progress-bar-fill{background:var(--primary);border-radius:4px;height:100%;transition:width .3s}.question-text{margin-bottom:30px;font-size:1.4rem;font-weight:600;line-height:1.5}.options-grid{flex-direction:column;gap:16px;display:flex}.option-btn{text-align:left;cursor:pointer;color:var(--text-main);background:#fff;border:2px solid #e5e7eb;border-radius:16px;align-items:center;gap:16px;padding:16px 24px;font-size:1.1rem;transition:all .2s;display:flex}.option-btn:hover:not(:disabled){border-color:var(--primary);background:#f5f3ff;transform:translateY(-1px)}.option-btn.selected{border-color:var(--primary);background:var(--primary);color:#fff}.option-btn.selected .option-letter{color:#fff;background:#fff3}.option-btn.correct{border-color:var(--success);background:var(--success);color:#fff}.option-btn.wrong{border-color:var(--error);background:var(--error);color:#fff}.option-letter{width:32px;height:32px;color:var(--text-muted);background:#f3f4f6;border-radius:8px;justify-content:center;align-items:center;font-weight:600;transition:all .2s;display:inline-flex}.result-header{text-align:center;margin-bottom:40px}.score-circle{border:8px solid;border-radius:50%;flex-direction:column;justify-content:center;align-items:center;width:150px;height:150px;margin:0 auto 20px;display:flex;box-shadow:inset 0 0 20px #0000000d}.score-circle.pass{border-color:var(--success);color:var(--success)}.score-circle.fail{border-color:var(--error);color:var(--error)}.score-value{font-size:3rem;font-weight:700;line-height:1}.score-label{margin-top:4px;font-size:1rem;font-weight:500}.result-status{font-size:1.8rem;font-weight:700}.result-status.pass{color:var(--success)}.result-status.fail{color:var(--error)}.wrong-answers-list{flex-direction:column;gap:20px;margin-top:30px;margin-bottom:40px;display:flex}.wrong-answer-card{box-shadow:var(--shadow-sm);border-left:6px solid var(--error);background:#fff;border-radius:16px;padding:24px}.wrong-q-text{margin-bottom:16px;font-size:1.1rem;font-weight:600}.answer-row{gap:12px;margin-bottom:8px;font-size:.95rem;display:flex}.answer-row.your-answer{color:var(--error)}.answer-row.correct-answer{color:var(--success);font-weight:600}.action-buttons{gap:16px;display:flex}.wide-mode-toggle{background:var(--surface);-webkit-backdrop-filter:blur(8px);color:var(--text-main);cursor:pointer;box-shadow:var(--shadow-md);z-index:1000;border:1px solid #80808033;border-radius:30px;padding:10px 18px;font-size:.9rem;font-weight:500;transition:all .3s cubic-bezier(.4,0,.2,1);position:fixed;bottom:25px;right:25px}.wide-mode-toggle:hover{background:var(--primary);color:#fff;border-color:var(--primary);transform:scale(1.05)translateY(-2px)}@media (width<=600px){.wide-mode-toggle{padding:8px 14px;font-size:.8rem;bottom:15px;right:15px}}