: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%}*{box-sizing:border-box;margin:0;padding:0}body{color:#e2e8f0;background:#0f172a;min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.app{max-width:800px;margin:0 auto;padding:0 16px 40px}.header{text-align:center;padding:32px 16px 20px}.header h1{color:#f8fafc;margin-bottom:6px;font-size:1.8rem}.subtitle{color:#94a3b8;font-size:.95rem}.home{flex-direction:column;gap:20px;display:flex}.card{background:#1e293b;border:1px solid #334155;border-radius:16px;padding:24px}.card h2{color:#f1f5f9;margin-bottom:8px;font-size:1.2rem}.card p{color:#94a3b8;margin-bottom:16px;font-size:.9rem}.exam-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:10px;display:grid}.exam-btn{cursor:pointer;background:#334155;border:1px solid #475569;border-radius:12px;flex-direction:column;align-items:center;gap:4px;padding:14px 12px;transition:all .2s;display:flex}.exam-btn:hover{background:#3b82f6;border-color:#3b82f6;transform:translateY(-2px)}.exam-name{color:#f1f5f9;font-size:.95rem;font-weight:600}.exam-range{color:#94a3b8;font-size:.75rem}.exam-btn:hover .exam-range{color:#bfdbfe}.big-btn{cursor:pointer;color:#f1f5f9;background:#334155;border:none;border-radius:12px;width:100%;padding:16px;font-size:1rem;font-weight:600;transition:all .2s}.big-btn:hover{transform:translateY(-2px)}.review-btn{background:#7c3aed}.review-btn:hover{background:#6d28d9}.random-btn{background:#059669}.random-btn:hover{background:#047857}.quiz-header{text-align:left;justify-content:space-between;align-items:center;padding:16px;display:flex}.back-btn{color:#e2e8f0;cursor:pointer;background:#334155;border:1px solid #475569;border-radius:8px;padding:8px 14px;font-size:.85rem;transition:all .2s}.back-btn:hover{background:#475569}.header-center{text-align:center}.header-title{color:#f1f5f9;font-size:.95rem;font-weight:600;display:block}.header-count{color:#94a3b8;font-size:.8rem}.header-answered{color:#64748b;background:#1e293b;border-radius:8px;padding:6px 12px;font-size:.8rem}.progress-bar{background:#334155;border-radius:2px;height:4px;margin-bottom:20px}.progress-fill{background:linear-gradient(90deg,#3b82f6,#7c3aed);border-radius:2px;height:100%;transition:width .3s}.quiz{flex-direction:column;gap:20px;display:flex}.question-card{background:#1e293b;border:1px solid #334155;border-radius:16px;padding:24px}.question-number{color:#64748b;margin-bottom:8px;font-size:.8rem}.question-text{color:#f1f5f9;margin-bottom:20px;font-size:1.1rem;line-height:1.6}.options{flex-direction:column;gap:10px;display:flex}.option{cursor:pointer;text-align:left;color:#e2e8f0;background:#0f172a;border:2px solid #334155;border-radius:12px;align-items:flex-start;gap:12px;padding:14px 16px;font-size:.95rem;line-height:1.5;transition:all .2s;display:flex}.option:hover:not(:disabled){background:#1e293b;border-color:#3b82f6}.option.selected{background:#1e3a5f;border-color:#3b82f6}.option.correct{background:#14532d;border-color:#22c55e}.option.wrong{background:#450a0a;border-color:#ef4444}.opt-letter{background:#334155;border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;font-size:.85rem;font-weight:700;display:flex}.option.selected .opt-letter{background:#3b82f6}.option.correct .opt-letter{background:#22c55e}.option.wrong .opt-letter{background:#ef4444}.opt-text{padding-top:3px}.explanation{border-radius:10px;margin-top:16px;padding:14px 16px;font-size:.95rem;font-weight:600}.exp-correct{color:#86efac;background:#14532d;border:1px solid #22c55e}.exp-wrong{color:#fca5a5;background:#450a0a;border:1px solid #ef4444}.nav-buttons{gap:12px;display:flex}.nav-btn{color:#e2e8f0;cursor:pointer;background:#1e293b;border:1px solid #475569;border-radius:12px;flex:1;padding:14px;font-size:.95rem;font-weight:600;transition:all .2s}.nav-btn:hover:not(:disabled){background:#334155}.nav-btn:disabled{opacity:.4;cursor:not-allowed}.nav-btn.primary{background:#3b82f6;border-color:#3b82f6}.nav-btn.primary:hover{background:#2563eb}.nav-btn.submit{background:#22c55e;border-color:#22c55e}.nav-btn.submit:hover{background:#16a34a}.result{justify-content:center;padding-top:20px;display:flex}.result-card{text-align:center;background:#1e293b;border:1px solid #334155;border-radius:20px;width:100%;padding:40px 32px}.score-circle{background:conic-gradient(#22c55e calc(var(--pct) * 1%), #334155 0);border-radius:50%;flex-direction:column;justify-content:center;align-items:center;width:160px;height:160px;margin:0 auto 24px;display:flex;position:relative}.score-circle:before{content:"";background:#1e293b;border-radius:50%;width:130px;height:130px;position:absolute}.score-emoji{z-index:1;font-size:2rem}.score-number{color:#f1f5f9;z-index:1;font-size:2rem;font-weight:800}.score-detail{color:#94a3b8;z-index:1;font-size:.85rem}.result-msg{color:#94a3b8;margin-bottom:24px;font-size:1rem}.result-actions{flex-direction:column;gap:10px;display:flex}.learn-exam-btn{background:#4c1d95;border-color:#6d28d9}.learn-exam-btn:hover{background:#7c3aed;border-color:#8b5cf6}.ref-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;display:grid}.ref-card-btn{cursor:pointer;text-align:center;background:#1e293b;border:1px solid #334155;border-radius:12px;flex-direction:column;align-items:center;gap:8px;padding:16px 12px;transition:all .2s;display:flex}.ref-card-btn:hover{background:#334155;border-color:#3b82f6;transform:translateY(-2px)}.ref-icon{font-size:1.8rem}.ref-title{color:#e2e8f0;font-size:.85rem;font-weight:600;line-height:1.3}.reference{flex-direction:column;gap:16px;display:flex}.ref-intro{background:#1e3a5f;border-color:#3b82f6}.ref-intro p{color:#bfdbfe;font-size:.95rem;line-height:1.6}.ref-item h3{color:#f1f5f9;margin-bottom:8px;font-size:1.05rem}.ref-desc{color:#94a3b8;margin-bottom:10px;font-size:.9rem;line-height:1.6}.ref-tags{flex-wrap:wrap;gap:6px;margin-bottom:10px;display:flex}.tag{color:#94a3b8;background:#334155;border-radius:6px;padding:3px 10px;font-size:.75rem}.exam-tip{color:#86efac;background:#14532d;border:1px solid #22c55e;border-radius:8px;margin-top:8px;padding:10px 14px;font-size:.85rem}.subitems{flex-direction:column;gap:8px;margin-top:12px;display:flex}.subitem{background:#0f172a;border-radius:8px;padding:10px 14px}.subitem strong{color:#e2e8f0;font-size:.9rem}.subitem p{color:#94a3b8;margin-top:4px;font-size:.82rem;line-height:1.5}.exp-header{margin-bottom:8px;font-size:1rem;font-weight:700}.exp-body{color:#cbd5e1;font-size:.9rem;font-weight:400;line-height:1.6}.exp-correct .exp-body{color:#bbf7d0}.exp-wrong .exp-body{color:#fecaca}@media (width<=600px){.ref-grid{grid-template-columns:repeat(2,1fr)}.ref-card-btn{padding:12px 8px}.ref-icon{font-size:1.4rem}}