:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--bg:#f5f6f8;--surface:#fff;--border:#e2e5ea;--text:#1c2027;--text-muted:#6b7280;--primary:#2952e3;--primary-hover:#1f3fc4;--correct:#1a8a4a;--correct-bg:#e8f7ee;--wrong:#c0362c;--wrong-bg:#fbeceb;--radius:10px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0}#app{min-height:100vh}.page{max-width:820px;margin:0 auto;padding:24px 20px 60px}.page-wide{max-width:900px}.app-header{text-align:center;margin-bottom:20px}.app-header h1{margin:0 0 4px;font-size:1.35rem}.quiz-header-row{justify-content:space-between;align-items:center;gap:12px;margin-bottom:14px;display:flex}.quiz-header-row h1{margin:0;font-size:1.15rem}.btn-leave{color:var(--wrong);border-color:var(--wrong-bg);flex-shrink:0}.btn-leave:hover{border-color:var(--wrong);color:var(--wrong)}.app-header p{color:var(--text-muted);margin:0}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px}.group-list{flex-direction:column;gap:12px;display:flex}.group-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;padding:16px 20px;display:flex}.group-card-actions{flex-shrink:0;gap:8px;display:flex}.group-card h2{margin:0 0 4px;font-size:1.1rem}.group-card p{color:var(--text-muted);margin:0;font-size:.9rem}button{font:inherit;cursor:pointer}.btn-primary{background:var(--primary);color:#fff;border:none;border-radius:7px;padding:8px 16px;font-size:.92rem;font-weight:600;transition:background .15s}.btn-primary:hover:not(:disabled){background:var(--primary-hover)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{color:var(--text);border:1px solid var(--border);background:0 0;border-radius:7px;padding:8px 16px;font-size:.92rem;font-weight:600}.btn-secondary:hover:not(:disabled){border-color:var(--primary);color:var(--primary)}.btn-secondary:disabled{opacity:.4;cursor:not-allowed}.progress-bar{background:var(--border);border-radius:4px;height:5px;margin-bottom:14px;overflow:hidden}.progress-bar-fill{background:var(--primary);height:100%;transition:width .2s}.quiz-topbar{color:var(--text-muted);justify-content:space-between;align-items:baseline;margin-bottom:8px;font-size:.85rem;display:flex}.question-number{color:var(--primary);font-weight:700}.question-text{margin:0 0 14px;font-size:1.02rem;font-weight:600;line-height:1.4}.options{flex-direction:column;gap:7px;display:flex}.option{text-align:left;border:1.5px solid var(--border);background:var(--surface);color:var(--text);border-radius:7px;padding:10px 14px;font-size:.92rem;line-height:1.35;transition:border-color .12s,background .12s}.option:hover:not(:disabled){border-color:var(--primary)}.option:disabled{cursor:default}.option.selected{border-color:var(--primary)}.option.correct{border-color:var(--correct);background:var(--correct-bg);color:var(--correct);font-weight:600}.option.wrong{border-color:var(--wrong);background:var(--wrong-bg);color:var(--wrong);font-weight:600}.feedback{margin-top:12px;font-size:.92rem;font-weight:700}.feedback.correct{color:var(--correct)}.feedback.wrong{color:var(--wrong)}.explanation{border-left:3px solid var(--primary);color:var(--text);background:#f0f3fb;border-radius:6px;margin-top:10px;padding:10px 13px;font-size:.86rem;line-height:1.45}.explanation.compact{margin-top:8px;padding:8px 12px;font-size:.82rem}.browse-header{flex-wrap:wrap;align-items:center;gap:14px;margin-bottom:6px;display:flex}.browse-header h1{flex:1;margin:0;font-size:1.15rem}.search-input{border:1px solid var(--border);background:var(--surface);width:220px;max-width:100%;color:var(--text);border-radius:7px;padding:7px 12px;font-size:.88rem}.browse-count{color:var(--text-muted);margin:10px 0;font-size:.82rem}.browse-item{background:var(--surface);border:1px solid var(--border);border-radius:8px;margin-bottom:8px;padding:12px 16px}.browse-question{margin-bottom:8px;font-size:.92rem;font-weight:600;line-height:1.4}.q-num{color:var(--primary)}.browse-options{flex-direction:column;gap:4px;margin:0;padding:0;list-style:none;display:flex}.browse-options li{color:var(--text-muted);border-radius:5px;padding:6px 10px;font-size:.86rem;line-height:1.35}.browse-options li.correct{background:var(--correct-bg);color:var(--correct);font-weight:600}.quiz-nav{justify-content:space-between;gap:10px;margin-top:18px;display:flex}.quiz-nav-right{gap:10px;display:flex}.jumpgrid{grid-template-columns:repeat(11,1fr);gap:5px;margin-top:18px;display:grid}.jumpgrid button{aspect-ratio:1;border:1.5px solid var(--border);background:var(--surface);color:var(--text-muted);border-radius:5px;font-size:.72rem;font-weight:600}.jumpgrid button.current{border-color:var(--primary);color:var(--primary)}.jumpgrid button.done-correct{background:var(--correct-bg);border-color:var(--correct);color:var(--correct)}.jumpgrid button.done-wrong{background:var(--wrong-bg);border-color:var(--wrong);color:var(--wrong)}.summary-hero{text-align:center;padding:12px 0 28px}.summary-score{color:var(--primary);font-size:3rem;font-weight:800}.summary-score span{color:var(--text-muted);font-size:1.5rem;font-weight:600}.summary-stats{justify-content:center;gap:28px;margin-top:8px;display:flex}.summary-stat{text-align:center}.summary-stat .n{font-size:1.4rem;font-weight:700}.summary-stat.correct .n{color:var(--correct)}.summary-stat.wrong .n{color:var(--wrong)}.summary-stat .label{color:var(--text-muted);font-size:.8rem}.review-item{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);margin-bottom:14px;padding:18px 20px}.review-item.unanswered{border-color:#d8a52c}.review-question{margin-bottom:12px;font-weight:600;line-height:1.5}.review-option{border:1px solid #0000;border-radius:6px;margin-bottom:6px;padding:8px 12px;font-size:.95rem}.review-option.correct{background:var(--correct-bg);color:var(--correct);font-weight:600}.review-option.wrong{background:var(--wrong-bg);color:var(--wrong);font-weight:600}.badge{vertical-align:middle;border-radius:999px;margin-left:8px;padding:2px 9px;font-size:.75rem;font-weight:700;display:inline-block}.badge.correct{background:var(--correct-bg);color:var(--correct)}.badge.wrong{background:var(--wrong-bg);color:var(--wrong)}.badge.unanswered{color:#8a6a12;background:#fbf3e0}.center{text-align:center}.error-text{color:var(--wrong)}.loading{text-align:center;color:var(--text-muted);padding:60px 0}