/* mf-blog-glass v1 — glassmorphism for /blog and /blog/{slug}. Builds on site.css + mf-ui.css + mf-v3.css variables. */
:root{--bg-r:28px;--bg-r-sm:18px;--bg-glass:rgba(255,255,255,.62);--bg-glass-2:rgba(255,255,255,.42);--bg-edge:rgba(255,255,255,.75);--bg-line:rgba(20,20,60,.10);--bg-shadow:0 10px 40px -12px rgba(40,30,110,.25);--bg-acc:var(--purple,#7c5cff);--bg-acc2:var(--blue,#3b82f6);--bg-txt:var(--text,#141428);--bg-mut:var(--muted,#5b5b75);--bg-fs:1.06rem}
[data-theme="dark"]{--bg-glass:rgba(22,22,40,.55);--bg-glass-2:rgba(30,30,55,.45);--bg-edge:rgba(255,255,255,.10);--bg-line:rgba(255,255,255,.08);--bg-shadow:0 14px 50px -16px rgba(0,0,0,.7)}
.bg-page{position:relative;isolation:isolate}
.bg-page::before{content:"";position:absolute;inset:-60px -10vw auto;height:520px;z-index:-1;pointer-events:none;background:radial-gradient(40% 60% at 15% 20%,color-mix(in srgb,var(--bg-acc) 28%,transparent),transparent 70%),radial-gradient(35% 55% at 85% 10%,color-mix(in srgb,var(--bg-acc2) 25%,transparent),transparent 70%);filter:blur(10px)}
.bg-glass{background:linear-gradient(145deg,var(--bg-glass),var(--bg-glass-2));-webkit-backdrop-filter:blur(18px) saturate(160%);backdrop-filter:blur(18px) saturate(160%);border:1px solid var(--bg-edge);border-radius:var(--bg-r);box-shadow:var(--bg-shadow),inset 0 1px 0 rgba(255,255,255,.25)}
@supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){.bg-glass{background:var(--card,#fff)}}
.bg-kicker{font-family:var(--mono,monospace);font-size:.74rem;letter-spacing:.08em;text-transform:uppercase;color:var(--bg-acc);margin:0 0 .4rem}
.bg-pill{display:inline-flex;align-items:center;padding:.32rem .8rem;border-radius:999px;font-size:.8rem;font-weight:600;text-decoration:none;color:var(--bg-txt);background:var(--bg-glass-2);border:1px solid var(--bg-edge);transition:transform .2s,background .2s}
.bg-pill:hover{transform:translateY(-1px);background:color-mix(in srgb,var(--bg-acc) 18%,transparent)}
/* listing */
.bg-list .bg-hero{padding:clamp(22px,4vw,44px);margin-bottom:22px}
.bg-list .bg-hero h1{background:linear-gradient(90deg,var(--bg-txt),var(--bg-acc));-webkit-background-clip:text;background-clip:text;color:transparent}
.bg-filter{display:flex;gap:10px;align-items:center;padding:10px;border-radius:999px;margin:18px 0}
.bg-filter .search{flex:1;border-radius:999px;background:transparent;border:0}
.bg-filter .search input{background:transparent;border:0;outline:0;width:100%;color:var(--bg-txt)}
.bg-filter .btn{border-radius:999px}
.bg-chips{margin-bottom:10px}
.bg-list .chip,.bg-single .chip{border-radius:999px;backdrop-filter:blur(8px)}
.bg-featured{display:grid;grid-template-columns:1.1fr 1fr;gap:26px;align-items:center;padding:clamp(18px,3vw,32px);margin:22px 0;overflow:hidden}
.bg-featured-img{border-radius:var(--bg-r-sm);width:100%;height:auto;box-shadow:var(--bg-shadow)}
.bg-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:22px}
.bg-grid .post-card{background:linear-gradient(145deg,var(--bg-glass),var(--bg-glass-2));-webkit-backdrop-filter:blur(16px) saturate(150%);backdrop-filter:blur(16px) saturate(150%);border:1px solid var(--bg-edge);border-radius:var(--bg-r);overflow:hidden;box-shadow:var(--bg-shadow);transition:transform .25s,box-shadow .25s}
.bg-grid .post-card:hover{transform:translateY(-4px);box-shadow:0 22px 50px -18px color-mix(in srgb,var(--bg-acc) 55%,transparent)}
.bg-grid .post-card img,.bg-grid .post-card .post-fallback{border-radius:calc(var(--bg-r) - 8px);margin:8px;width:calc(100% - 16px);aspect-ratio:16/9;object-fit:cover}
.bg-grid .post-card .badge{border-radius:999px}
.bg-read{padding:clamp(18px,3vw,32px);margin-top:22px;border-top:1px solid var(--bg-edge)!important}
.bg-read-first{margin-top:0;padding-top:0;border-top:0}
/* single */
.bg-progress{position:fixed;top:0;left:0;right:0;height:4px;z-index:9999;background:transparent}
.bg-progress span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--bg-acc),var(--bg-acc2));border-radius:0 4px 4px 0;box-shadow:0 0 12px var(--bg-acc)}
.bg-single{max-width:1200px;margin:0 auto;padding:18px clamp(12px,3vw,24px) 60px}
.bg-crumbs ol{display:flex;flex-wrap:wrap;gap:6px;list-style:none;padding:0;margin:0 0 14px;font-size:.85rem;color:var(--bg-mut)}
.bg-crumbs li+li::before{content:"/";margin-right:6px;opacity:.5}
.bg-crumbs a{color:inherit}.bg-crumbs [aria-current]{color:var(--bg-txt);max-width:42ch;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;display:inline-block;vertical-align:bottom}
.bg-hero{padding:clamp(20px,4vw,44px);margin-bottom:22px}
.bg-single .bg-hero h1{font-family:var(--display);font-size:clamp(1.9rem,4.4vw,3.2rem);line-height:1.1;margin:.6rem 0}
.bg-lede{font-size:1.12rem;color:var(--bg-mut);max-width:70ch}
.bg-meta{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0}
.bg-meta>span{padding:.3rem .75rem;border-radius:999px;background:var(--bg-glass-2);border:1px solid var(--bg-edge);font-size:.84rem}
.bg-upd{color:var(--ok,#16a34a)}
.bg-toolbar{display:flex;flex-wrap:wrap;gap:8px}
.bg-toolbar button,.bg-share a,.bg-share button,.bg-helpful button{font:inherit;font-size:.85rem;cursor:pointer;padding:.45rem .9rem;border-radius:999px;border:1px solid var(--bg-edge);background:var(--bg-glass-2);color:var(--bg-txt);text-decoration:none;transition:background .2s,transform .2s}
.bg-toolbar button:hover,.bg-share a:hover,.bg-share button:hover,.bg-helpful button:hover{background:color-mix(in srgb,var(--bg-acc) 20%,transparent);transform:translateY(-1px)}
.bg-toolbar [aria-pressed="true"],.bg-helpful button.is-on{background:var(--bg-acc);color:#fff}
.bg-layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:26px;align-items:start}
.bg-layout:has(.bg-toc-wrap[hidden]){grid-template-columns:minmax(0,1fr)}
.bg-toc-wrap{position:sticky;top:90px}
.bg-toc{padding:18px;max-height:calc(100vh - 120px);overflow:auto;border-radius:var(--bg-r-sm)}
.bg-toc a{display:block;padding:.38rem .7rem;border-radius:12px;font-size:.88rem;color:var(--bg-mut);text-decoration:none;border-left:2px solid transparent;line-height:1.35}
.bg-toc a.lvl3{padding-left:1.5rem;font-size:.82rem}
.bg-toc a:hover{color:var(--bg-txt);background:var(--bg-glass-2)}
.bg-toc a.is-active{color:var(--bg-acc);background:color-mix(in srgb,var(--bg-acc) 12%,transparent);border-left-color:var(--bg-acc);font-weight:600}
.bg-article{padding:clamp(18px,4vw,48px);min-width:0}
.bg-cover{width:100%;height:auto;border-radius:var(--bg-r-sm);margin-bottom:24px;cursor:zoom-in}
.bg-prose{font-size:var(--bg-fs);line-height:1.8;max-width:74ch;margin:0 auto}
.bg-prose h2,.bg-prose h3{position:relative;scroll-margin-top:90px}
.bg-prose .bg-anchor{position:absolute;left:-1.1em;opacity:0;text-decoration:none;color:var(--bg-acc);transition:opacity .2s}
.bg-prose h2:hover .bg-anchor,.bg-prose h3:hover .bg-anchor,.bg-anchor:focus{opacity:1}
.bg-prose img{border-radius:var(--bg-r-sm);cursor:zoom-in;max-width:100%;height:auto}
.bg-prose pre{position:relative;border-radius:var(--bg-r-sm);padding:2.4rem 1.2rem 1.1rem;overflow:auto;background:#0f1022;color:#e7e7f5;border:1px solid var(--bg-edge)}
.bg-prose :not(pre)>code{border-radius:8px;padding:.1em .4em;background:var(--bg-glass-2)}
.bg-prose table{display:block;overflow-x:auto;border-collapse:collapse;border-radius:var(--bg-r-sm)}
.bg-prose th,.bg-prose td{padding:.6rem .8rem;border-bottom:1px solid var(--bg-line)}
.bg-prose blockquote{margin:1.4rem 0;padding:1rem 1.3rem;border-radius:var(--bg-r-sm);background:var(--bg-glass-2);border-left:4px solid var(--bg-acc)}
.bg-copy{position:absolute;top:8px;right:8px;font:600 .74rem var(--mono,monospace);padding:.3rem .65rem;border-radius:999px;border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.1);color:#fff;cursor:pointer}
.bg-copy:hover{background:rgba(255,255,255,.22)}
.bg-tags,.bg-share,.bg-helpful{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:24px;padding-top:20px;border-top:1px solid var(--bg-line)}
.bg-share .bg-kicker{margin:0 6px 0 0}
.bg-helpful em{font-style:normal;color:var(--bg-mut);font-size:.88rem}
.bg-author{display:flex;gap:20px;align-items:center;padding:clamp(18px,3vw,30px);margin:28px 0}
.bg-author img{width:96px;height:96px;border-radius:50%;object-fit:cover;border:3px solid var(--bg-edge);flex:none}
.bg-author h2{margin:0 0 .3rem;font-size:1.3rem}.bg-author p{margin:.2rem 0;color:var(--bg-mut)}
.bg-social{display:flex;gap:8px;margin-top:10px}
.bg-social a{display:grid;place-items:center;width:38px;height:38px;border-radius:12px;background:var(--bg-glass-2);border:1px solid var(--bg-edge);color:var(--bg-txt);transition:transform .2s,background .2s}
.bg-social a:hover{transform:translateY(-2px);background:var(--bg-acc);color:#fff}.bg-social svg{width:18px;height:18px}
.bg-prevnext{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:22px 0}
.bg-pn{display:flex;flex-direction:column;gap:6px;padding:18px 22px;text-decoration:none;color:var(--bg-txt);transition:transform .2s}
.bg-pn:hover{transform:translateY(-3px)}.bg-pn span{font-size:.8rem;color:var(--bg-acc);font-weight:700}.bg-pn-next{text-align:right}
.bg-related h2{font-family:var(--display);margin:34px 0 14px}
.bg-fab{position:fixed;right:18px;z-index:900;border:1px solid var(--bg-edge);background:var(--bg-glass);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);color:var(--bg-txt);border-radius:999px;box-shadow:var(--bg-shadow);cursor:pointer;font:600 .9rem var(--font,inherit);transition:opacity .25s,transform .25s}
.bg-totop{bottom:18px;width:46px;height:46px;font-size:1.2rem;opacity:0;pointer-events:none;transform:translateY(10px)}
.bg-totop.is-on{opacity:1;pointer-events:auto;transform:none}
.bg-tocbtn{bottom:74px;padding:.65rem 1.1rem}
.bg-lightbox{position:fixed;inset:0;z-index:10000;display:grid;place-items:center;background:rgba(8,8,20,.78);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);padding:4vw;cursor:zoom-out}
.bg-lightbox[hidden]{display:none}.bg-lightbox img{max-width:100%;max-height:90vh;border-radius:var(--bg-r-sm)}
.bg-lightbox button{position:absolute;top:16px;right:18px;width:44px;height:44px;border-radius:50%;border:0;background:rgba(255,255,255,.15);color:#fff;font-size:1.6rem;cursor:pointer}
.bg-toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%,30px);opacity:0;z-index:10001;padding:.6rem 1.1rem;border-radius:999px;background:var(--bg-acc);color:#fff;font-weight:600;transition:.3s;pointer-events:none}
.bg-toast.is-on{opacity:1;transform:translate(-50%,0)}
/* focus mode */
html.bg-focus header.site-header,html.bg-focus .site-header,html.bg-focus footer,html.bg-focus .bg-toc-wrap,html.bg-focus .bg-related,html.bg-focus .bg-prevnext,html.bg-focus .bg-author,html.bg-focus .bg-crumbs,html.bg-focus [class*="mf42-"],html.bg-focus nav.mf-nav{display:none!important}
html.bg-focus .bg-layout{grid-template-columns:minmax(0,1fr)}
html.bg-focus .bg-article{max-width:820px;margin:0 auto}
/* mobile */
@media (max-width:960px){
 .bg-layout{grid-template-columns:minmax(0,1fr)}
 .bg-toc-wrap{position:fixed;left:12px;right:12px;bottom:126px;top:auto;z-index:950;display:none}
 .bg-toc-wrap.is-open{display:block}.bg-toc{max-height:55vh;background:var(--bg-glass);}
 .bg-featured{grid-template-columns:1fr}.bg-featured-img{order:-1}
}
@media (min-width:961px){.bg-tocbtn{display:none}}
@media (max-width:600px){
 :root{--bg-r:22px;--bg-r-sm:16px}
 .bg-prevnext{grid-template-columns:1fr}.bg-pn-next{text-align:left}
 .bg-author{flex-direction:column;text-align:center}.bg-social{justify-content:center}
 .bg-prose .bg-anchor{display:none}.bg-filter{border-radius:var(--bg-r-sm)}
}
@media (prefers-reduced-motion:reduce){.bg-page *{transition:none!important}}
@media print{
 .bg-progress,.bg-toolbar,.bg-share,.bg-helpful,.bg-fab,.bg-toc-wrap,.bg-related,.bg-prevnext,.bg-copy,.bg-anchor,header,footer,nav{display:none!important}
 .bg-glass{background:#fff!important;box-shadow:none!important;border:0!important;backdrop-filter:none!important}
 .bg-page::before{display:none}.bg-layout{display:block}body{color:#000;background:#fff}
 .bg-prose a[href^="http"]::after{content:" (" attr(href) ")";font-size:.8em}
}