:root{--color-ink:#0f172a;--color-body:#475467;--color-muted:#667085;--color-subtle:#98a2b3;--color-line-soft:#eef0f2;--color-line:#e4e7ec;--color-line-strong:#d0d5dd;--color-hairline:#0f172a14;--color-surface:#fff;--color-surface-sunken:#f9fafb;--color-chip:#f2f4f7;--card-bg:var(--color-surface);--color-success:#15803d;--color-success-bg:#15803d1f;--color-warning:#92400e;--color-warning-bg:#fffbeb;--color-warning-line:#fde68a;--color-danger:#c0264b;--text-2xs:.6875rem;--text-xs:.75rem;--text-sm:.8125rem;--text-base:.875rem;--text-md:.9375rem;--text-lg:1rem;--text-xl:1.125rem;--text-2xl:1.3125rem;--text-3xl:1.625rem;--text-4xl:2rem;--text-display:clamp(1.5rem, 4vw, 2.0625rem);--text-hero:clamp(2.25rem, 5vw, 4.75rem);--leading-tight:1.15;--leading-snug:1.3;--leading-normal:1.45;--leading-relaxed:1.6;--tracking-tight:-.02em;--tracking-caps:.1em;--fw-normal:400;--fw-medium:600;--fw-semibold:700;--fw-bold:800;--fw-black:900;--space-1:4px;--space-1-5:6px;--space-2:8px;--space-2-5:10px;--space-3:12px;--space-3-5:14px;--space-4:16px;--space-4-5:18px;--space-5:20px;--space-6:24px;--space-8:32px;--space-10:40px;--space-12:48px;--radius-xs:8px;--radius-sm:10px;--radius-md:12px;--radius-lg:14px;--radius-xl:16px;--radius-2xl:18px;--radius-3xl:24px;--radius-4xl:28px;--radius-pill:999px;--radius-circle:50%;--shadow-xs:0 1px 2px #0f172a0a;--shadow-sm:0 2px 8px #0f172a08;--shadow-md:0 4px 14px #0f172a09;--shadow-card:0 1px 2px #0f172a0a, 0 10px 26px #0f172a0d;--shadow-hover:0 10px 22px #0f172a17;--shadow-xl:0 18px 50px #0f172a17;--ease:cubic-bezier(.4, 0, .2, 1);--duration:.15s;--lift:translateY(-2px);--page-max:1050px;--reading-max:760px;--sidebar-width:380px}[data-tint=blue]{--tint-bg:#0866ff1a;--tint-fg:#0866ff;--tint-border:#0866ff4d}[data-tint=rose]{--tint-bg:#e11d4817;--tint-fg:#c0264b;--tint-border:#e11d4847}[data-tint=green]{--tint-bg:#31a24c1f;--tint-fg:#25843e;--tint-border:#31a24c4d}[data-tint=purple]{--tint-bg:#7c3aed1a;--tint-fg:#6d28d9;--tint-border:#7c3aed4d}[data-tint=amber]{--tint-bg:#f5a62324;--tint-fg:#9a6700;--tint-border:#f5a62352}[data-tint=teal]{--tint-bg:#0d94881f;--tint-fg:#0f766e;--tint-border:#0d94884d}[data-tint=pink]{--tint-bg:#db27771a;--tint-fg:#be185d;--tint-border:#db277747}[data-tint=slate]{--tint-bg:#4755691a;--tint-fg:#475569;--tint-border:#47556947}[data-tint=indigo]{--tint-bg:#4f46e51a;--tint-fg:#4338ca;--tint-border:#4f46e54d}[data-tint=cyan]{--tint-bg:#0891b21a;--tint-fg:#0e7490;--tint-border:#0891b24d}[data-role=student]{--accent:#4338ca;--accent-deep:#312e81;--accent-soft:linear-gradient(145deg, #eff6ff, #eef2ff);--accent-gradient:linear-gradient(135deg, #38bdf8 0%, #6366f1 100%);--accent-shadow:#4338ca4d;--accent-shadow-strong:#4338ca66;--accent-button:linear-gradient(135deg, #4338ca, #1d4ed8);--accent-button-hover:linear-gradient(135deg, #4c3fe0, #2354e8);--accent-button-border:#4338ca;--accent-ring:#4f46e526}[data-role=teacher]{--accent:#0f766e;--accent-deep:#14532d;--accent-soft:linear-gradient(145deg, #ecfeff, #d1fae5);--accent-gradient:radial-gradient(circle at 92% 0%, #facc1559, transparent 45%), radial-gradient(circle at 4% 100%, #2dd4bf59, transparent 50%), linear-gradient(135deg, #0d9488 0%, #15803d 55%, #14532d 100%);--accent-shadow:#0f3d2d47;--accent-shadow-strong:#06281e66;--accent-button:linear-gradient(135deg, #0d9488, #15803d);--accent-button-hover:linear-gradient(135deg, #0f9c8f, #16904a);--accent-button-border:#0f766e;--accent-ring:#0d948826}
:root{--background:#f0f2f5;--foreground:#050505;--primary-blue:#0866ff;--secondary-bg:#e4e6eb;--success-green:#31a24c;--danger-red:#f02849;--border-color:#ced0d4;--topic-rail-height:38px;--surface:#fff;--font-primary:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif}html,body{background-color:var(--background);max-width:100vw;color:var(--foreground);font-family:var(--font-primary);height:100%;margin:0;padding:0;overflow-x:hidden}*{box-sizing:border-box}body.feed-route>footer{display:none!important}a{color:inherit;text-decoration:none}button{cursor:pointer;color:inherit;background:0 0;border:none;font-family:inherit}
.Header-module___SnCCq__header{top:var(--impersonation-offset,0px);-webkit-backdrop-filter:blur(10px);z-index:100;border-bottom:1px solid var(--border-color);background-color:#fffffff2;flex-wrap:wrap;justify-content:space-between;align-items:center;width:100%;padding:8px 16px;display:flex;position:fixed;left:0;box-shadow:0 1px 2px #0000000d}.Header-module___SnCCq__logoContainer{align-items:center;gap:8px;display:flex}.Header-module___SnCCq__logoImage{object-fit:cover;border-radius:8px}.Header-module___SnCCq__brandName{color:var(--primary-blue);letter-spacing:-.5px;font-size:1.3rem;font-weight:800}.Header-module___SnCCq__profilePlaceholder{align-items:center;display:flex}.Header-module___SnCCq__navBtn{cursor:pointer;color:var(--foreground);background:0 0;border:none;border-radius:24px;align-items:center;gap:6px;margin-right:8px;padding:4px 12px;font-size:.9rem;font-weight:600;transition:background-color .2s;display:flex;position:relative}.Header-module___SnCCq__navBtn:hover{background-color:var(--secondary-bg)}.Header-module___SnCCq__navBadge{color:#fff;background:#ef4444;border-radius:999px;justify-content:center;align-items:center;min-width:18px;height:18px;padding:0 4px;font-size:.7rem;font-weight:700;display:flex;position:absolute;top:-4px;right:-4px}.Header-module___SnCCq__navBadgeRing{border:2px solid var(--background)}@media (max-width:480px){.Header-module___SnCCq__navLabel,.Header-module___SnCCq__profileName{display:none}.Header-module___SnCCq__navBtn{margin-right:0;padding:4px 8px}}.Header-module___SnCCq__avatar{background-color:var(--secondary-bg);border-radius:50%;width:36px;height:36px}.Header-module___SnCCq__headerCenter{order:3;align-items:center;width:100%;padding-top:6px;display:flex}.Header-module___SnCCq__loginBtn{background-color:var(--primary-blue);color:#fff;cursor:pointer;border:none;border-radius:6px;padding:8px 16px;font-size:.9rem;font-weight:600;transition:background-color .2s;box-shadow:0 1px 2px #0000001a}.Header-module___SnCCq__loginBtn:hover{background-color:#075ce6}