:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5;--accent: #7c5cfc;--accent-glow: rgba(124, 92, 252, .25);--correct: #34d399;--correct-bg: rgba(52, 211, 153, .12);--wrong: #f87171;--wrong-bg: rgba(248, 113, 113, .12)}*{box-sizing:border-box;margin:0}html,body,#root{min-height:100vh;background:#0a0a0a;color:#fafafa}.shell{min-height:100vh;display:grid;place-items:center;padding:1.5rem}.card{width:100%;max-width:32rem;border:1px solid rgba(255,255,255,.08);padding:2rem;border-radius:1rem;background:#ffffff08;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.result-card{text-align:center}.result-card h1{font-size:3.5rem;background:linear-gradient(135deg,var(--accent),#c084fc);-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:.25rem}.score-msg{font-size:1.05rem;color:#ffffffb3;margin-bottom:1.5rem}.tag{display:inline-block;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.65rem;letter-spacing:.2em;text-transform:uppercase;color:var(--accent);border:1px solid rgba(124,92,252,.3);padding:.2rem .6rem;border-radius:.25rem}.header-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.counter{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.75rem;color:#fff6}.progress-bar{height:3px;background:#ffffff14;border-radius:2px;margin-bottom:1.5rem;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--accent),#c084fc);border-radius:2px;transition:width .4s ease}.question{font-size:1.2rem;font-weight:600;line-height:1.5;letter-spacing:-.01em;margin-bottom:1.5rem}.options{display:flex;flex-direction:column;gap:.6rem}.option{display:flex;align-items:center;gap:.75rem;width:100%;padding:.85rem 1rem;border:1px solid rgba(255,255,255,.08);border-radius:.6rem;background:#ffffff08;color:#ffffffd9;font-size:.95rem;cursor:pointer;transition:all .2s ease;text-align:left;font-family:inherit}.option:hover:not(.correct):not(.wrong){border-color:#ffffff26;background:#ffffff0f}.option.selected{border-color:var(--accent);background:var(--accent-glow)}.option.correct{border-color:var(--correct);background:var(--correct-bg);color:var(--correct)}.option.wrong{border-color:var(--wrong);background:var(--wrong-bg);color:var(--wrong)}.option-letter{display:inline-flex;align-items:center;justify-content:center;width:1.6rem;height:1.6rem;border-radius:.4rem;background:#ffffff0f;font-size:.75rem;font-weight:600;flex-shrink:0;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}.option.correct .option-letter{background:#34d39933}.option.wrong .option-letter{background:#f8717133}.explanation{margin-top:1.25rem;padding-top:1.25rem;border-top:1px solid rgba(255,255,255,.06);display:flex;flex-direction:column;gap:1rem}.explanation-text{font-size:.9rem;color:#ffffff8c;line-height:1.6}.btn{padding:.7rem 1.5rem;border:none;border-radius:.5rem;font-size:.9rem;font-weight:600;cursor:pointer;font-family:inherit;transition:all .2s ease}.btn.primary{background:var(--accent);color:#fff;align-self:flex-end}.btn.primary:hover{background:#6a4ae0;box-shadow:0 0 20px var(--accent-glow)}.result-card .btn.primary{align-self:center;margin-top:.5rem}