@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";
:root{--bg-deep:#4779d1;--bg-primary:#5286e2;--bg-secondary:#6394ee;--bg-card:#ffffff26;--bg-card-hover:#ffffff40;--surface-glass:#fff3;--surface-glass-strong:#fff6;--border-glass:#ffffff4d;--border-glass-bright:#fff9;--text-primary:#fff;--text-secondary:#eef2ff;--text-muted:#c7d2fe;--accent-blue:#2563eb;--accent-blue-glow:#fff6;--accent-cyan:#a5b4fc;--accent-cyan-glow:#ffffff4d;--success:#22c55e;--success-glow:#22c55e80;--error:#ef4444;--error-glow:#ef444466;--warning:#f59e0b;--a1-color:#818cf8;--a2-color:#f472b6;--b1-color:#fbbf24;--font-main:"Inter", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;--radius-sm:8px;--radius-md:14px;--radius-lg:20px;--radius-xl:28px;--shadow-glow:0 0 30px #ffffff26, 0 0 60px #ffffff0d;--shadow-card:0 4px 24px #0000001a, 0 1px 4px #0000000d;--text-shadow-soft:0 1px 3px #00000047;--transition-fast:.15s cubic-bezier(.4, 0, .2, 1);--transition-normal:.25s cubic-bezier(.4, 0, .2, 1);--transition-slow:.4s cubic-bezier(.4, 0, .2, 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10px;font-size:.7rem;font-weight:700}.meta-tag.level{text-shadow:none;background:#ffffffe6;border:1px solid #fff}.meta-tag.level.a1{color:#4f46e5}.meta-tag.level.a2{color:#db2777}.meta-tag.level.b1{color:#d97706}.meta-tag.pos{color:#fff;border:1px solid var(--border-glass);background:#ffffff26}.options-grid{flex-direction:column;gap:10px;display:flex}.option-btn{border-radius:var(--radius-md);border:1px solid var(--border-glass);background:var(--bg-card);color:#fff;cursor:pointer;width:100%;transition:var(--transition-normal);text-align:left;font-size:1rem;font-weight:600;font-family:var(--font-main);text-shadow:var(--text-shadow-soft);padding:14px 18px;position:relative;overflow:hidden;box-shadow:0 2px 8px #0000000d}.option-btn:before{content:"";width:0;height:100%;transition:width 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.option-letter{color:#fff;width:24px;height:24px;transition:var(--transition-fast);background:#fff3;border-radius:6px;flex-shrink:0;justify-content:center;align-items:center;margin-right:12px;font-size:.75rem;font-weight:800;display:inline-flex}.option-btn:hover:not(:disabled) .option-letter{color:var(--accent-blue);background:#fff}.option-btn.correct .option-letter,.option-btn.incorrect .option-letter{color:#fff;background:#ffffff4d}@keyframes correctPulse{0%{transform:scale(1)}30%{transform:scale(1.02)}to{transform:scale(1)}}@keyframes shake{0%,to{transform:translate(0)}20%{transform:translate(-8px)}40%{transform:translate(8px)}60%{transform:translate(-4px)}80%{transform:translate(4px)}}.example-section{border-radius:var(--radius-md);background:#00000040;border:1px solid #ffffff26;margin-top:20px;padding:16px;animation:.3s 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