.xzq-heading-tree{--xzq-toc-bg:#fff;--xzq-toc-text:#16374e;--xzq-toc-card:#f7f9fb;--xzq-toc-border:#e7ecf1;--xzq-toc-accent:#0086b8;padding:20px 15px 24px;background:var(--xzq-toc-bg);color:var(--xzq-toc-text);border:1px solid #dedede;border-radius:13px;box-shadow:0 2px 5px rgba(25,40,55,.07);box-sizing:border-box}
.xzq-heading-tree .xzq-tree-title{display:flex;align-items:center;gap:8px;color:#111;font-size:18px;line-height:26px;font-weight:700;margin:0 0 25px;padding:0 0 25px;border-bottom:1px solid #ddd}
.xzq-heading-tree .xzq-tree-icon{font-size:20px;line-height:1;flex:none}
.xzq-heading-tree nav{max-height:65vh;overflow:auto;font-size:15px;line-height:1.6;overscroll-behavior:contain;padding:1px 0 2px}
.xzq-heading-tree ul{list-style:none!important;margin:0!important;padding:0!important}
.xzq-heading-tree ul ul{padding-left:14px!important;margin-top:8px!important}
.xzq-heading-tree li{list-style:none!important;padding:0!important;margin:0 0 8px!important;border:0!important;background:none!important}
.xzq-heading-tree li:last-child{margin-bottom:0!important}
.xzq-heading-tree li::before,.xzq-heading-tree li::after{display:none!important}
.xzq-heading-tree nav a{display:flex!important;align-items:baseline;gap:10px;box-sizing:border-box;min-height:50px;padding:12px 15px;border:1px solid var(--xzq-toc-border);border-radius:10px;background:var(--xzq-toc-card);box-shadow:0 2px 4px rgba(30,50,70,.05);color:var(--xzq-toc-text)!important;font-weight:600;text-decoration:none!important;overflow-wrap:anywhere;white-space:normal;line-height:24px;transition:background .15s,border-color .15s}
.xzq-heading-tree nav a::before{content:'•';color:var(--xzq-toc-accent);font-size:17px;flex:none}
.xzq-heading-tree nav a:hover,.xzq-heading-tree nav a.is-active{background:#edf7fc;border-color:#b8dceb;color:#006e9c!important}
.xzq-heading-tree nav a:focus-visible{outline:2px solid var(--xzq-toc-accent);outline-offset:-3px}
.xzq-heading-tree .xzq-tree-empty{margin:0;color:#7c8793;font-size:14px}
body.night .xzq-heading-tree{--xzq-toc-bg:#202733;--xzq-toc-text:#e2e8f0;--xzq-toc-card:#283241;--xzq-toc-border:#3c4554;--xzq-toc-accent:#64caef;border-color:#3c4554}
body.night .xzq-heading-tree .xzq-tree-title{color:#f1f5f9;border-color:#3c4554}
body.night .xzq-heading-tree nav a:hover,body.night .xzq-heading-tree nav a.is-active{background:#203f51;border-color:#427a93;color:#9adef7!important}
@media(prefers-reduced-motion:reduce){.xzq-heading-tree nav a{transition:none}}