:root{--text:#6b6375;--text-h:#08060d;--bg:#fff;--border:#e5e4e7;--code-bg:#f4f3ec;--accent:#aa3bff;--accent-bg:#aa3bff1a;--accent-border:#aa3bff80;--social-bg:#f4f3ec80;--shadow:#0000001a 0 10px 15px -3px, #0000000d 0 4px 6px -2px;--sans:system-ui, "Segoe UI", Roboto, sans-serif;--heading:system-ui, "Segoe UI", Roboto, sans-serif;--mono:ui-monospace, Consolas, monospace;font:18px/145% var(--sans);letter-spacing:.18px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}}@media (width<=1024px){:root{font-size:16px}}@media (prefers-color-scheme:dark){:root{--text:#9ca3af;--text-h:#f3f4f6;--bg:#16171d;--border:#2e303a;--code-bg:#1f2028;--accent:#c084fc;--accent-bg:#c084fc26;--accent-border:#c084fc80;--social-bg:#2f303a80;--shadow:#0006 0 10px 15px -3px, #00000040 0 4px 6px -2px}#social .button-icon{filter:invert()brightness(2)}}body{margin:0}#root{text-align:center;border-inline:1px solid var(--border);box-sizing:border-box;flex-direction:column;width:1126px;max-width:100%;min-height:100svh;margin:0 auto;display:flex}h1,h2{font-family:var(--heading);color:var(--text-h);font-weight:500}h1{letter-spacing:-1.68px;margin:32px 0;font-size:56px}@media (width<=1024px){h1{margin:20px 0;font-size:36px}}h2{letter-spacing:-.24px;margin:0 0 8px;font-size:24px;line-height:118%}@media (width<=1024px){h2{font-size:20px}}p{margin:0}code,.counter{font-family:var(--mono);color:var(--text-h);border-radius:4px;display:inline-flex}code{background:var(--code-bg);padding:4px 8px;font-size:15px;line-height:135%}:root{--primary:#ffbf00;--secondary:#8b4513;--bg:#0f172a;--card:#ffffff0d;--text:#f8fafc;--muted:#94a3b8;--success:#22c55e;--error:#ef4444}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;margin:0;padding:0}body{background-color:var(--bg);color:var(--text);justify-content:center;min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,Segoe UI,Roboto,Helvetica,Arial,sans-serif;display:flex}.app{flex-direction:column;justify-content:center;width:100%;max-width:500px;min-height:100vh;padding:20px;display:flex}.card,.quiz-container{background:var(--card);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid #ffffff1a;border-radius:24px;padding:32px 24px;box-shadow:0 10px 30px #0000004d}.fade-in{animation:.4s ease-out fadeIn}@keyframes 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12px;font-size:.75rem}.quiz-header{margin-bottom:24px}.progress-bar{background:#ffffff1a;border-radius:3px;height:6px;margin-bottom:12px;overflow:hidden}.progress-fill{background:var(--primary);height:100%;transition:width .3s}.meta{color:var(--muted);justify-content:space-between;font-size:.85rem;display:flex}.question-card h2{min-height:80px;margin-bottom:24px;font-size:1.15rem;line-height:1.5}.options{flex-direction:column;gap:12px;display:flex}.option-btn{color:#fff;text-align:left;cursor:pointer;background:#ffffff0d;border:1px solid #ffffff1a;border-radius:12px;width:100%;padding:16px;font-size:1rem;transition:all .2s}.option-btn.active{border-color:var(--primary);background:#ffbf001a}.option-btn.correct{background:var(--success);color:#fff;border:none}.option-btn.wrong{background:var(--error);color:#fff;border:none}.option-btn.disabled{opacity:.5}.btn-next{border:2px solid var(--primary);width:100%;color:var(--primary);background:0 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