:root{color-scheme:light;--primary:#2563eb;--primary-hover:#1d4ed8;--primary-light:#dbeafe;--primary-text:#1e40af;--success:#16a34a;--success-light:#dcfce7;--success-text:#166534;--warning:#f59e0b;--warning-light:#fef3c7;--warning-text:#92400e;--error:#ef4444;--error-hover:#dc2626;--error-light:#fee2e2;--error-text:#991b1b;--info:#2563eb;--info-light:#dbeafe;--info-text:#1e40af;--primary-tint:rgba(37,99,235,0.08);--primary-tint-subtle:rgba(37,99,235,0.06);--success-tint:rgba(22,163,74,0.08);--success-border:rgba(22,163,74,0.2);--warning-surface:#fefce8;--warning-surface-strong:#fef08a;--selection-warning:#fff8d9;--selection-success:#eef8ef;--bg-page:#f5f7fa;--bg-card:#ffffff;--bg-hover:#f1f5f9;--bg-muted:#f8fafc;--bg-sidebar:#fafbfc;--text-primary:#1e293b;--text-secondary:#475569;--text-muted:#94a3b8;--text-inverse:#ffffff;--border:#e2e8f0;--border-hover:#cbd5e1;--gray-50:#f9fafb;--gray-100:#f3f4f6;--gray-200:#e5e7eb;--gray-300:#d1d5db;--gray-400:#9ca3af;--gray-500:#6b7280;--gray-600:#4b5563;--gray-700:#374151;--gray-800:#1f2937;--gray-900:#111827;--medal-gold:#b77900;--medal-silver:#667085;--medal-bronze:#a15c23;--code-bg:#111827;--code-text:#e5e7eb;--chart-1:#ff4f4f;--chart-2:#ff694f;--chart-3:#f8603a;--chart-4:#fc8354;--chart-5:#fa9231;--chart-6:#f7bb3b;--chart-7:#ecdb44;--chart-8:#e2ec52;--chart-9:#b0d628;--chart-10:#93b127;--chart-11:#25ad40;--radius-sm:4px;--radius:6px;--radius-md:8px;--radius-lg:12px;--radius-full:9999px;--shadow-xs:0 1px 2px rgba(0,0,0,0.04);--shadow-sm:0 1px 3px rgba(0,0,0,0.06),0 1px 2px rgba(0,0,0,0.04);--shadow:0 2px 4px rgba(0,0,0,0.06),0 1px 2px rgba(0,0,0,0.04);--shadow-md:0 4px 6px rgba(0,0,0,0.06),0 2px 4px rgba(0,0,0,0.04);--shadow-lg:0 10px 15px rgba(0,0,0,0.08),0 4px 6px rgba(0,0,0,0.04);--shadow-color-faint:rgba(0,0,0,0.04);--shadow-color-soft:rgba(0,0,0,0.06);--shadow-color-medium:rgba(0,0,0,0.08);--shadow-popover-color:rgba(35,49,80,0.14);--shadow-panel-color:rgba(34,53,90,0.08);--surface-glass:rgba(255,255,255,0.42);--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:20px;--space-6:24px;--space-8:32px;--space-10:40px;--text-xs:0.75rem;--text-sm:0.875rem;--text-base:1rem;--text-lg:1.125rem;--text-xl:1.25rem;--text-2xl:1.5rem;--shell-header-height:64px;--shell-sidebar-width:232px;--content-max-width:1440px;--content-reading-width:1120px;--overlay-backdrop:rgba(15,23,42,0.5);--z-popover:200;--z-dialog:1000;--control-height-sm:32px;--control-height:38px;--control-height-lg:44px;--focus-ring:0 0 0 3px rgba(37,99,235,0.2);--focus-ring-color:rgba(37,99,235,0.2);--transition-fast:120ms ease;--transition:180ms ease}*{box-sizing:border-box;padding:0;margin:0}body,html{max-width:100vw;overflow-x:hidden;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--bg-page);color:var(--text-primary);font-size:16px;line-height:1.5}a{color:inherit;text-decoration:none}button{cursor:pointer;border:none;background:none}button,input,select,textarea{font-family:inherit}[tabindex]:focus-visible,a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:none;box-shadow:var(--focus-ring)}::selection{background:var(--primary-light);color:var(--primary-text)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}[data-app-content]>div,[data-app-content]>main{min-width:0}[data-page-host]>div[style*="padding: 1.5rem"][style*=max-width],[data-page-host]>div[style*="padding: 2rem"][style*=max-width],[data-page-host]>main[style*="padding: 2rem"]{max-width:none!important;margin:0!important;padding:0!important}.teacher-page-content{min-width:0}@media (prefers-reduced-motion:reduce){*,:after,:before{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}@keyframes spin{to{transform:rotate(1turn)}}.markdown-content{line-height:1.8;color:#1e293b}.markdown-content h1{font-size:1.5rem;font-weight:700;margin-top:1.75rem;margin-bottom:.75rem;color:#0f172a}.markdown-content h2{font-size:1.25rem;font-weight:600;margin-top:1.75rem;margin-bottom:.75rem;color:#1e293b}.markdown-content h3{font-size:1.1rem;font-weight:600;margin-top:1.25rem;margin-bottom:.5rem;color:#1e293b}.markdown-content h4{font-size:.8rem;color:#64748b;font-weight:600;text-transform:uppercase;letter-spacing:.05em;margin-top:1rem;margin-bottom:.375rem}.markdown-content p{margin-bottom:.75rem}.markdown-content ol,.markdown-content ul{margin-left:1.5rem;margin-bottom:.75rem}.markdown-content li{margin-bottom:.375rem}.markdown-content a{color:#1d4ed8;text-decoration:underline}.markdown-content a:hover{color:#1e40af}.markdown-content code{background:#f1f5f9;color:#0f172a;padding:.1rem .375rem;border-radius:4px;border:none;font-family:Courier New,monospace;font-size:.9em}.markdown-content pre{background:#f8fafc;color:#1e293b;padding:1rem;border-radius:6px;overflow-x:auto;margin-bottom:.75rem;font-size:.875rem;line-height:1.6}.markdown-content pre code{background:none;color:inherit;padding:0;border:none}.markdown-content blockquote{border-left:3px solid #94a3b8;background:#f8fafc;padding:.75rem 1rem;border-radius:0 4px 4px 0;margin-left:0;margin-bottom:.75rem;color:#334155}.markdown-content strong{font-weight:600}.markdown-content em{font-style:italic}.markdown-content hr{border:none;border-top:1px solid #e2e8f0;margin:1.5rem 0}.markdown-content table{width:100%;border-collapse:collapse;margin-bottom:.75rem}.markdown-content td,.markdown-content th{border:1px solid #e2e8f0;padding:.5rem;text-align:left}.markdown-content th{background:#f8fafc;font-weight:600}.markdown-content .katex{font-size:1.05em}.markdown-content .align{margin:1rem 0}.markdown-content .align.center,.markdown-content .center{text-align:center}.markdown-content img{max-width:100%;height:auto;display:block;margin:1rem auto}@keyframes resource-skeleton-pulse{0%,to{opacity:.45}50%{opacity:.9}}.resource-skeleton{display:grid;grid-gap:.75rem;gap:.75rem;min-height:10rem;padding:1.5rem;align-content:start}.resource-skeleton-line{height:1rem;border-radius:4px;background:var(--gray-200);animation:resource-skeleton-pulse 1.2s ease-in-out infinite}