.subject_section_nav{box-sizing:border-box;border:1px solid color-mix(in srgb, var(--text-color) 14%, transparent);background:color-mix(in lch, var(--card) 90%, var(--more-contrast-card));-webkit-overflow-scrolling:touch;scroll-snap-type:x proximity;scrollbar-width:none;border-radius:12px;flex-wrap:nowrap;gap:6px;padding:5px;display:flex;overflow-x:auto;box-shadow:0 2px 14px #0000001f}.subject_section_nav::-webkit-scrollbar{display:none}@media screen and (width>=1024px){.subject_section_nav{flex-wrap:wrap;overflow-x:visible}}.subject_section_nav{width:100%;min-width:0;top:max(6px, env(safe-area-inset-top,0px));z-index:12;-webkit-backdrop-filter:blur(10px);align-self:stretch;margin:-2px 0 0;position:sticky}@media screen and (width<=640px){.subject_section_nav{border-radius:10px;margin-top:0}}.subject_section_nav_btn{scroll-snap-align:start;font:inherit;font-size:clamp(.756rem, (.0000729167 * (var(--current-width) - 768) * 1rem), .84rem);color:var(--text-color-secondary);background:color-mix(in lch, var(--more-contrast-card) 42%, var(--card));border:1px solid color-mix(in srgb, var(--text-color) 12%, transparent);cursor:pointer;white-space:nowrap;border-radius:9px;flex:0 auto;justify-content:center;align-items:center;gap:6px;padding:8px 14px;font-weight:650;line-height:1.2;text-decoration:none;transition:background .15s,color .15s,border-color .15s,box-shadow .15s;display:inline-flex}.subject_section_nav_btn:hover:not(:disabled){color:var(--text-color);background:color-mix(in lch, var(--accent) 11%, var(--card));border-color:color-mix(in lch, var(--accent) 32%, transparent)}.subject_section_nav_btn--active,.subject_section_nav_btn[aria-selected=true]{color:var(--text-color);background:color-mix(in lch, var(--accent) 20%, var(--card));border-color:color-mix(in lch, var(--accent) 50%, transparent);box-shadow:0 2px 12px color-mix(in srgb, var(--accent) 16%, transparent);font-weight:800}.subject_section_nav_btn:disabled{opacity:.5;cursor:not-allowed}.subject_section_nav_btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.subject_section_nav_btn{min-width:max(5rem, fit-content)}.subject_section_nav_btn--active .subject_section_nav_badge{color:var(--text-color);background:color-mix(in lch, var(--accent) 58%, var(--card));border-color:color-mix(in lch, var(--accent) 30%, transparent)}.subject_section_nav_badge{font-variant-numeric:tabular-nums;min-width:1.25rem;height:1.25rem;color:var(--text-color-secondary);background:color-mix(in lch, var(--muted) 12%, var(--card));border:1px solid color-mix(in srgb, var(--text-color) 10%, transparent);border-radius:999px;flex-shrink:0;place-items:center;padding:0 .35rem;font-size:.68rem;font-weight:800;display:inline-grid}