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.5rem;border-radius:var(--radius-sm);font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em}.badge-easy{background:#dcfce7;color:#166534}.badge-medium{background:#fef3c7;color:#92400e}.badge-hard{background:#fee2e2;color:#991b1b}.badge-very-hard{background:#ede9fe;color:#5b21b6}.badge-11{background:var(--color-straw-container);color:var(--color-primary)}.badge-13{background:var(--color-primary);color:#f5f2ea}.badge-num{background:#dbeafe;color:#1e40af}.badge-alg{background:#ede9fe;color:#5b21b6}.badge-rat{background:#fce7f3;color:#9d174d}.badge-geo{background:#ccfbf1;color:#0f766e}.badge-mea{background:#ffedd5;color:#9a3412}.badge-sta{background:#cffafe;color:#0e7490}.filter-panel{background:var(--surface-low);border-radius:var(--radius-lg);padding:var(--space-lg);margin-bottom:var(--space-lg)}.filter-row{display:flex;flex-wrap:wrap;gap:var(--space-md);align-items:flex-end}.filter-group{display:flex;flex-direction:column;gap:var(--space-xs)}.filter-label{font-size:.7rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--color-text-muted)}.filter-select{padding:var(--space-sm) var(--space-md);border:1px solid var(--color-border);border-radius:var(--radius-md);font-family:var(--font-sans);font-size:.875rem;min-width:150px;background:var(--surface-container);cursor:pointer}.filter-select:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 2px #1c3b1e1f}.question-list{display:flex;flex-direction:column;gap:var(--space-md)}.question-count{font-size:.75rem;letter-spacing:.08em;text-transform:uppercase;color:var(--color-text-muted);margin-bottom:var(--space-md)}.question-card{background:var(--surface-container);border-left:3px solid var(--color-straw);border-radius:var(--radius-md);overflow:hidden;transition:box-shadow .2s}.question-card:hover{box-shadow:var(--shadow-md)}.question-header{display:flex;flex-wrap:wrap;align-items:center;gap:var(--space-sm);padding:var(--space-md) var(--space-lg);background:var(--surface-low)}.question-id{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.06em;color:var(--color-text-muted)}.question-badges{display:flex;gap:var(--space-xs);margin-left:auto}.question-body{padding:var(--space-lg)}.question-text{line-height:1.8;white-space:pre-wrap;font-size:.9375rem}.question-text p{margin-bottom:var(--space-md)}.answer-section{padding:var(--space-lg);background:var(--surface-low)}.answer-toggle{margin-top:var(--space-md)}.marking-scheme{margin-bottom:var(--space-lg)}.marking-scheme h4{font-size:.7rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--color-text-muted);margin-bottom:var(--space-sm)}.marking-scheme ul{list-style:none;padding-left:var(--space-md)}.marking-scheme li{margin-bottom:var(--space-xs);font-weight:500}.solutions h4{font-size:.7rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--color-text-muted);margin-bottom:var(--space-sm)}.solution-part{margin-bottom:var(--space-lg);padding:var(--space-md);background:var(--surface-container);border-radius:var(--radius-md)}.solution-part h5{color:var(--color-primary);margin-bottom:var(--space-sm)}.practice-setup{max-width:500px;margin:0 auto}.practice-setup h2{font-family:var(--font-display);margin-bottom:var(--space-lg)}.practice-options{display:flex;flex-direction:column;gap:var(--space-md);margin-bottom:var(--space-xl)}.practice-session{max-width:800px;margin:0 auto}.practice-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--space-lg);padding:var(--space-md) var(--space-lg);background:var(--color-primary);color:#f5f2ea;border-radius:var(--radius-lg)}.practice-progress{font-weight:600;font-size:.875rem;letter-spacing:.05em}.timer{font-family:var(--font-mono);font-size:1.125rem;font-weight:600;padding:var(--space-xs) var(--space-md);background:#f5f2ea26;border-radius:var(--radius-md);color:#f5f2ea}.timer.warning{color:var(--color-straw);background:#d8b54726}.practice-nav{display:flex;justify-content:space-between;margin-top:var(--space-lg)}.practice-actions{display:flex;gap:var(--space-sm);margin-top:var(--space-md)}.progress-bar-track{height:12px;background:var(--surface-mid);border-radius:var(--radius-sm);overflow:hidden}.progress-bar-fill{height:100%;background:var(--color-straw);border-radius:var(--radius-sm);transition:width .4s ease}.pagination{display:flex;justify-content:center;gap:var(--space-sm);margin-top:var(--space-xl)}.page-btn{padding:var(--space-sm) var(--space-md);border:1px solid var(--color-border);background:var(--surface-container);border-radius:var(--radius-md);cursor:pointer;font-family:var(--font-sans);font-size:.875rem;font-weight:500}.page-btn:hover{background:var(--surface-low)}.page-btn.active{background:var(--color-primary);color:#f5f2ea;border-color:var(--color-primary)}.page-btn:disabled{opacity:.4;cursor:not-allowed}.loading{display:flex;justify-content:center;align-items:center;padding:var(--space-2xl);color:var(--color-text-muted);font-size:.875rem;letter-spacing:.05em}.error{padding:var(--space-lg);background:#fee2e2;color:#991b1b;border-radius:var(--radius-lg);text-align:center}.empty-state{text-align:center;padding:var(--space-2xl);color:var(--color-text-muted)}@media (max-width: 768px){.header-inner{flex-direction:column;gap:var(--space-sm)}.filter-row{flex-direction:column}.filter-select{width:100%}.question-header{flex-direction:column;align-items:flex-start}.question-badges{margin-left:0;margin-top:var(--space-sm)}.main-content{padding:var(--space-md)}}.question-diagram{margin:var(--space-md) 0;display:flex;justify-content:center;background:var(--surface-low);border-radius:var(--radius-sm);padding:var(--space-md)}.diagram-svg{max-width:100%;max-height:320px;height:auto}.katex-display{margin:var(--space-sm) 0;overflow-x:auto}.katex{font-size:1.05em}.exam-row{position:relative;border-bottom:1px solid var(--surface-mid);transition:background .15s}.exam-row:hover{background:var(--surface-low);border-left:3px solid var(--color-straw);padding-left:calc(1.25rem - 3px)}.exam-row-answer{background:var(--surface-low);padding:1rem 1.25rem}.heading-editorial{font-family:var(--font-display);font-weight:600;letter-spacing:-.01em;color:var(--color-text)}.label-upper{font-size:.7rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--color-text-muted)}