.btoc{border:1px solid var(--line);border-radius:var(--r-4);background:var(--surface)}.btoc__title{padding:14px var(--s-4);border-radius:var(--r-4);font-weight:var(--fw-bold);cursor:pointer;justify-content:space-between;align-items:center;list-style:none;display:flex}.btoc__title::-webkit-details-marker{display:none}.btoc__title:after{content:"";border-right:2px solid var(--fg-muted);border-bottom:2px solid var(--fg-muted);width:8px;height:8px;transition:transform .3s var(--ease-state);transform:translateY(-2px)rotate(45deg)}.btoc[open] .btoc__title:after{transform:translateY(2px)rotate(-135deg)}.btoc__title:focus-visible{outline:var(--focus-line);outline-offset:var(--focus-offset)}.btoc__list{gap:var(--s-2);padding:0 var(--s-4) 14px 34px;font-size:var(--text-16);margin:0;display:grid}.btoc__list a{color:var(--fg-secondary);text-decoration:none}@media (min-width:1024px){.btoc{border:0;border-left:2px solid var(--line);background:0 0;border-radius:0}.btoc__title{padding:0 0 10px var(--s-4);font-size:var(--text-14);color:var(--fg-muted);cursor:default;pointer-events:none;border-radius:0}.btoc__title:after{display:none}@supports selector(::details-content){.btoc::details-content{content-visibility:visible;block-size:auto}}.btoc__list{gap:2px;padding:0;list-style:none}.btoc__list a{padding:6px 0 6px var(--s-4);color:var(--fg-secondary);font-size:var(--text-14);transition:color .3s var(--ease-state), border-color .3s var(--ease-state);border-left:2px solid #0000;margin-left:-2px;line-height:1.4;display:block}.btoc__list a:focus-visible{outline:var(--focus-line);outline-offset:var(--focus-offset)}.btoc__list a[aria-current]{color:var(--fg);font-weight:var(--fw-bold);border-left-color:var(--action)}@media (hover:hover){.btoc__list a:hover{color:var(--fg)}}}@media (prefers-reduced-motion:reduce){.btoc__title:after,.btoc__list a{transition:none}}