/* Article (single post) blocks — TOC, meta, share, related. Theme-independent. */
:root{--art-paper:#F4F1E4;--art-paper2:#FCFAF1;--art-ink:#14201A;--art-green:#123B2C;--art-green9:#0B241B;
  --art-teal:#17B8A6;--art-tealh:#12998B;--art-tealsoft:#D6F2ED;--art-line:#DCD5BF;--art-line2:#cfc6ac;--art-muted:#6C7268;
  --art-sh:6px 6px 0 rgba(0,0,0,.25)}

/* One sharp chevron for every caret on the site, drawn as a mask so it is
 * identical everywhere and independent of the font — Ray renders «‹» as a
 * near-invisible hairline and «▾» as a blunt triangle. Base points LEFT
 * (reading direction in RTL); rotate -90deg for down, 90deg for up. */
:root{--nafr-chev:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'><path d='M15.5 4.5 8 12l7.5 7.5' fill='none' stroke='black' stroke-width='2.75' stroke-linecap='round' stroke-linejoin='round'/></svg>")}

/* TOC (in the .art-side sidebar of single-post.html) */
.nafr-art-toc{background:var(--art-paper2);border:1.5px solid var(--art-ink);border-radius:18px;padding:14px;font-family:"WRay","Vazirmatn",Tahoma,sans-serif}
.nafr-art-toc summary{list-style:none;cursor:pointer;font-weight:900;font-size:15px;color:var(--art-green);padding:6px 8px;display:flex;align-items:center;justify-content:space-between}
.nafr-art-toc summary::-webkit-details-marker{display:none}
.nafr-art-toc summary::after{content:"";flex:0 0 auto;width:13px;height:13px;background:var(--art-tealh);-webkit-mask:var(--nafr-chev) center/contain no-repeat;mask:var(--nafr-chev) center/contain no-repeat;transition:transform .25s}
.nafr-art-toc[open] summary::after{transform:rotate(-90deg)}
.nafr-art-toc nav{display:flex;flex-direction:column;margin-top:8px;gap:2px}
.nafr-art-toc nav a{position:relative;padding:10px 12px;border-radius:9px;font-family:inherit;font-weight:600;font-size:14px;color:var(--art-muted);line-height:1.65;text-decoration:none;transition:background .16s,color .16s}
.nafr-art-toc nav a:hover{background:rgba(0,0,0,.08);color:var(--art-green)}
.nafr-art-toc nav a.active{background:rgba(0,0,0,.08);color:var(--art-green9);font-weight:800}
.nafr-art-toc nav a.lv2{padding-right:24px;font-size:13.5px}
.nafr-art-toc nav a.lv2::before{content:"";position:absolute;right:14px;top:15px;width:4px;height:4px;border-radius:50%;background:var(--art-line2)}

/* Mobile: the TOC leaves the sidebar and becomes a sheet pinned to the bottom
 * of the viewport — collapsed it is just its own summary bar, tapping it opens
 * the list upward. `--nafr-bottom-bar` is the height of whatever bar the theme
 * already occupies down there (nafr-theme publishes its tab-bar height); with
 * no theme setting it, the sheet sits flush on the viewport bottom. */
@media(max-width:1040px){
  .nafr-art-toc{position:fixed;left:0;right:0;bottom:var(--nafr-bottom-bar,0px);z-index:74;
    margin:0;padding:0 12px 12px;border-width:1.5px 0 0;border-radius:16px 16px 0 0;
    max-height:min(64vh,460px);overflow-y:auto;overscroll-behavior:contain;
    box-shadow:0 -8px 26px rgba(11,36,27,.16)}
  .nafr-art-toc summary{position:sticky;top:0;z-index:1;background:var(--art-paper2);
    padding:14px 8px;font-size:15.5px}
  /* closed → chevron points up (opens upward); open → points down (closes) */
  .nafr-art-toc summary::after{transform:rotate(90deg)}
  .nafr-art-toc[open] summary::after{transform:rotate(-90deg)}
  .nafr-art-toc nav{margin-top:0;padding-bottom:6px}
  .nafr-art-toc nav a{padding:12px;font-size:14.5px}
}

/* meta */
.nafr-art-meta{display:flex;gap:22px;flex-wrap:wrap;color:var(--art-muted);font-family:"WRay","Vazirmatn",Tahoma,sans-serif;font-weight:600;font-size:14px;margin:6px 0 20px}
.nafr-art-meta span{display:inline-flex;align-items:center;gap:6px}

/* share */
.nafr-art-share{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:28px 0;padding:16px 0;border-top:1.5px solid var(--art-line);border-bottom:1.5px solid var(--art-line)}
.nafr-art-share .lbl{font-family:"WRay","Vazirmatn",Tahoma,sans-serif;font-weight:800;font-size:14px;color:var(--art-ink)}
.nafr-art-sbtn{font-family:"WRay","Vazirmatn",Tahoma,sans-serif;font-weight:800;font-size:13.5px;border:1.5px solid var(--art-ink);background:var(--art-paper2);border-radius:40px;padding:9px 18px;cursor:pointer;color:var(--art-ink);text-decoration:none;transition:background .16s,color .16s}
.nafr-art-sbtn:hover{background:var(--art-ink);color:#fff}

/* related */
.nafr-art-related{margin-top:44px}
.nafr-art-related h2{font-family:"WRay","Vazirmatn",Tahoma,sans-serif;font-weight:900;font-size:24px;margin:0 0 20px;color:var(--art-ink)}
.nafr-art-rgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px}
.nafr-art-rcard{display:flex;flex-direction:column;gap:10px;background:var(--art-paper2);border:1.5px solid var(--art-ink);border-radius:16px;padding:14px;text-decoration:none;transition:transform .2s,box-shadow .2s,background .2s}
.nafr-art-rcard:hover{transform:translate(3px,-3px);box-shadow:var(--art-sh);background:#fff}
.nafr-art-rcard .th{display:flex;align-items:center;justify-content:center;height:110px;border-radius:10px;border:1.5px dashed var(--art-line);background:var(--art-paper);color:var(--art-muted);font-family:"Vazirmatn",Tahoma,sans-serif;font-size:11.5px;overflow:hidden}
.nafr-art-rcard .th.has-img{border-style:solid}
.nafr-art-rcard .th.is-ph{border-style:solid;color:var(--art-green)}
.nafr-art-rcard .th.is-ph svg{width:40px;height:40px;opacity:.2}
.nafr-art-rcard .th img{width:100%;height:100%;object-fit:cover;border-radius:9px}
.nafr-art-rcard h3{font-family:"WRay","Vazirmatn",Tahoma,sans-serif;font-weight:900;font-size:15px;line-height:1.5;margin:0;color:var(--art-ink)}