/* ============================================================
   TSN Lab — research publication design system
   Identity: TSN V3 (verbatim tokens from explorer.tsnchain.com)
   Aesthetic: near-black research lab. Restraint, precision,
   hand-drawn technical diagrams. Not a marketing site.
   ============================================================ */

/* url() is resolved relative to THIS css file (lab root) — same for index & articles */
@font-face{
  font-family:'Albert Sans';font-style:normal;font-weight:300 800;font-display:swap;
  src:url('assets/fonts/AlbertSans-var.woff2') format('woff2');
}
@font-face{
  font-family:'JetBrains Mono';font-style:normal;font-weight:400 700;font-display:swap;
  src:url('assets/fonts/JetBrainsMono-var.woff2') format('woff2');
}

:root{
  color-scheme: dark;
  --bg:#050508;
  --bg-veil:rgba(7,7,12,.72);
  --panel:rgba(10,11,22,.55);
  --ink:#f4f6ff;
  --dim:#9aa4ba;
  --muted:#5d6678;
  --lav:#a5b4fc;
  --lav-bright:#d7defe;
  --teal:#77dfc4;
  --gold:#ecc659;
  --blue:#3dbdfe;
  --rose:#e15ea0;
  --line:rgba(165,180,252,.13);
  --line-strong:rgba(165,180,252,.28);
  --mono:'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans:'Albert Sans', system-ui, -apple-system, "Segoe UI", sans-serif;
  --measure: 68ch;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
html,body{margin:0;background:var(--bg)}
body{
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.68;
  -webkit-font-smoothing:antialiased;
  font-feature-settings:"ss01" 1;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
img{max-width:100%}

/* ambient: flat near-black + a single faint lavender wash top-right (explorer Network) */
.bg{position:fixed;inset:0;z-index:0;pointer-events:none;
  background:radial-gradient(1200px 700px at 88% -8%, rgba(165,180,252,.06), transparent 60%), var(--bg);}
.bg::after{content:"";position:absolute;inset:0;opacity:.5;
  background-image:radial-gradient(circle at 50% 50%, rgba(165,180,252,.05) .5px, transparent .5px);
  background-size:26px 26px;
  -webkit-mask-image:radial-gradient(900px 500px at 85% 0%, #000, transparent 70%);
          mask-image:radial-gradient(900px 500px at 85% 0%, #000, transparent 70%);}

/* ---------- shell ---------- */
.wrap{position:relative;z-index:1;max-width:1120px;margin:0 auto;padding:0 32px}
.reading{max-width:760px;margin:0 auto}

/* ---------- top nav ---------- */
.nav{position:sticky;top:0;z-index:30;backdrop-filter:blur(16px) saturate(120%);
  background:linear-gradient(180deg, rgba(5,5,8,.9), rgba(5,5,8,.55));
  border-bottom:1px solid var(--line)}
.nav-in{max-width:1120px;margin:0 auto;padding:15px 32px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:inline-flex;align-items:center;gap:11px}
.brand svg{width:27px;height:27px;display:block}
.brand b{font-weight:800;font-size:1.04rem;letter-spacing:.045em;color:var(--lav)}
.brand .lab{font-family:var(--mono);font-size:.6rem;letter-spacing:.24em;color:var(--muted);text-transform:uppercase;padding-top:2px}
.nav-links{display:flex;gap:4px;align-items:center}
.nav-links a{font:600 11px/1 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--dim);padding:9px 12px;border-radius:8px;transition:.18s var(--ease)}
.nav-links a:hover{color:var(--ink);background:rgba(165,180,252,.06)}
.nav-links a.ext::after{content:"↗";margin-left:5px;color:var(--muted)}

/* ---------- masthead ---------- */
.mast{padding:76px 0 34px;border-bottom:1px solid var(--line)}
.kicker{color:var(--lav);font:700 10px/1.3 var(--mono);letter-spacing:.24em;text-transform:uppercase;display:flex;align-items:center;gap:12px;margin-bottom:22px}
.kicker::before{content:"";width:34px;height:1px;background:linear-gradient(90deg,var(--lav),transparent)}
.mast h1{font-size:clamp(34px,5vw,54px);font-weight:760;line-height:1.03;letter-spacing:-.035em;max-width:15ch;text-wrap:balance}
.mast h1 em{font-style:normal;color:var(--lav);text-shadow:0 0 40px rgba(165,180,252,.3)}
.mast p{margin-top:22px;max-width:60ch;font-size:18px;color:var(--dim);line-height:1.6}
.mast .meta{margin-top:26px;display:flex;flex-wrap:wrap;gap:20px;font:600 11px/1 var(--mono);letter-spacing:.06em;color:var(--muted);text-transform:uppercase}
.mast .meta b{color:var(--teal);font-weight:700}

/* ---------- section headers ---------- */
.sec-h{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin:54px 0 22px}
.sec-h h2{font:700 11px/1 var(--mono);letter-spacing:.2em;text-transform:uppercase;color:var(--dim)}
.sec-h .rule{flex:1;height:1px;background:var(--line);margin:0 4px}
.sec-h .count{font:600 11px/1 var(--mono);color:var(--muted)}

/* ---------- pinned / featured ---------- */
.pinned{display:grid;grid-template-columns:1.4fr 1fr;gap:1px;border:1px solid var(--line);border-radius:18px;overflow:hidden;background:var(--line)}
.pinned .cell{background:linear-gradient(180deg, rgba(12,13,24,.6), rgba(7,7,12,.7));padding:30px 30px 26px;position:relative;transition:.2s var(--ease)}
.pinned .cell:hover{background:linear-gradient(180deg, rgba(18,19,34,.7), rgba(9,9,16,.8))}
.pinned .big{display:flex;flex-direction:column}
.pinned .big .art-diagram{margin:18px 0 6px}
.side{display:grid;grid-template-rows:1fr 1fr;gap:1px;background:var(--line)}

/* ---------- article card ---------- */
.tag{display:inline-flex;align-items:center;gap:6px;font:700 9.5px/1 var(--mono);letter-spacing:.11em;text-transform:uppercase;padding:5px 9px;border-radius:999px;border:1px solid var(--line-strong);color:var(--lav);background:rgba(165,180,252,.07)}
.tag.security{color:var(--rose);border-color:rgba(225,94,160,.32);background:rgba(225,94,160,.07)}
.tag.engineering{color:var(--gold);border-color:rgba(236,198,89,.32);background:rgba(236,198,89,.07)}
.tag.architecture{color:var(--lav)}
.tag.consensus{color:var(--blue);border-color:rgba(61,189,254,.32);background:rgba(61,189,254,.07)}
.tag.negative{color:var(--teal);border-color:rgba(119,223,196,.3);background:rgba(119,223,196,.06)}
.tag .dot{width:5px;height:5px;border-radius:50%;background:currentColor;box-shadow:0 0 7px currentColor}

.card-tags{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:15px}
.card-title{font-size:23px;font-weight:730;letter-spacing:-.02em;line-height:1.18;text-wrap:balance}
.pinned .big .card-title{font-size:29px}
.card-abstract{margin-top:12px;color:var(--dim);font-size:15px;line-height:1.6}
.card-foot{margin-top:auto;padding-top:18px;display:flex;align-items:center;gap:16px;font:600 11px/1 var(--mono);letter-spacing:.04em;color:var(--muted)}
.card-foot .read::before{content:"◷ ";color:var(--lav)}
.card-foot time{color:var(--dim)}
.card-link{color:inherit}
.card-link:hover .card-title{color:var(--lav-bright)}

/* ---------- feed list ---------- */
.feed{border-top:1px solid var(--line)}
.feed-item{display:grid;grid-template-columns:132px 1fr;gap:28px;padding:26px 8px;border-bottom:1px solid var(--line);transition:.16s var(--ease)}
.feed-item:hover{background:rgba(165,180,252,.028)}
.feed-item .rail{font:600 11px/1.7 var(--mono);color:var(--muted);text-transform:uppercase;letter-spacing:.05em}
.feed-item .rail .n{display:block;color:var(--lav);font-size:12px;letter-spacing:.1em;margin-bottom:8px}
.feed-item .rail time{display:block;color:var(--dim)}
.feed-body .card-title{font-size:21px}
.feed-body .card-abstract{font-size:14.5px}
.feed-item.stub{opacity:.62}
.feed-item.stub .card-title{color:var(--dim)}
.feed-item.stub .soon{font:700 9px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--gold);border:1px solid rgba(236,198,89,.3);border-radius:999px;padding:4px 8px;background:rgba(236,198,89,.05)}

/* ---------- footer ---------- */
.foot{margin-top:70px;padding:34px 0 60px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;
  font:500 12px/1.6 var(--mono);color:var(--muted)}
.foot b{color:var(--lav);font-weight:700}
.foot a{color:var(--dim)}
.foot a:hover{color:var(--ink)}

/* ============================================================
   ARTICLE PAGE
   ============================================================ */
.art-head{padding:64px 0 32px;border-bottom:1px solid var(--line)}
.back{display:inline-flex;align-items:center;gap:8px;font:600 11px/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--dim);margin-bottom:30px}
.back:hover{color:var(--lav)}
.art-head h1{font-size:clamp(30px,4.2vw,44px);font-weight:760;letter-spacing:-.03em;line-height:1.08;margin-top:16px;text-wrap:balance}
.art-lede{margin-top:22px;font-size:19.5px;line-height:1.55;color:var(--dim);max-width:60ch}
.art-meta{margin-top:28px;display:flex;flex-wrap:wrap;gap:22px;align-items:center;font:600 11px/1 var(--mono);letter-spacing:.05em;text-transform:uppercase;color:var(--muted)}
.art-meta .read::before{content:"◷ ";color:var(--lav)}
.art-meta time{color:var(--dim)}
.art-meta .auth{color:var(--dim)}

.art-body{padding:46px 0 20px}
.art-body p{margin:0 0 22px;max-width:var(--measure)}
.art-body h2{font-size:15px;font:700 13px/1.4 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--lav);margin:52px 0 20px;max-width:var(--measure);display:flex;align-items:center;gap:14px}
.art-body h2::before{content:"";width:22px;height:1px;background:var(--lav);flex:none}
.art-body h3{font-size:21px;font-weight:720;letter-spacing:-.01em;margin:38px 0 14px;max-width:var(--measure)}
.art-body strong{color:var(--ink);font-weight:680}
.art-body em{color:var(--lav-bright);font-style:italic}
.art-body a.cite{color:var(--lav);border-bottom:1px solid var(--line-strong)}
.art-body ul,.art-body ol{max-width:var(--measure);margin:0 0 22px;padding-left:22px;color:var(--dim)}
.art-body li{margin:0 0 9px}
.art-body li::marker{color:var(--lav)}
code,.mono{font-family:var(--mono);font-size:.9em}
.art-body p code,.art-body li code{color:var(--teal);background:rgba(119,223,196,.08);border:1px solid rgba(119,223,196,.16);border-radius:5px;padding:1px 6px;font-size:.84em}

/* callouts */
.callout{max-width:var(--measure);margin:30px 0;border:1px solid var(--line-strong);border-left-width:2px;border-radius:0 12px 12px 0;padding:20px 24px;background:var(--panel)}
.callout .lbl{font:700 10px/1 var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--lav);margin-bottom:11px;display:block}
.callout.warn{border-left-color:var(--gold)}
.callout.warn .lbl{color:var(--gold)}
.callout.correction{border-left-color:var(--teal)}
.callout.correction .lbl{color:var(--teal)}
.callout.threat{border-left-color:var(--rose)}
.callout.threat .lbl{color:var(--rose)}
.callout p{margin:0;max-width:none;color:var(--dim);font-size:15.5px}

/* figures + SVG diagrams */
figure.fig{max-width:var(--measure);margin:36px 0}
figure.fig.wide{max-width:860px}
.fig-frame{border:1px solid var(--line);border-radius:16px;background:linear-gradient(180deg, rgba(10,11,22,.5), rgba(7,7,12,.6));padding:26px 24px;overflow-x:auto}
.fig svg{display:block;width:100%;height:auto}
figcaption{margin-top:13px;font:500 12.5px/1.55 var(--mono);color:var(--muted);letter-spacing:.01em}
figcaption b{color:var(--dim);font-weight:600}

/* data table */
.dtable{max-width:var(--measure);margin:30px 0;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.dtable table{width:100%;border-collapse:collapse;font-size:14px}
.dtable th,.dtable td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line)}
.dtable th{font:700 10px/1 var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);background:rgba(165,180,252,.04)}
.dtable td{color:var(--dim)}
.dtable td.num{font-family:var(--mono);font-variant-numeric:tabular-nums;color:var(--ink);text-align:right}
.dtable tr:last-child td{border-bottom:0}

/* status chip */
.status{display:inline-flex;align-items:center;gap:8px;font:700 10px/1 var(--mono);letter-spacing:.1em;text-transform:uppercase;padding:6px 11px;border-radius:999px}
.status.closed{color:var(--teal);border:1px solid rgba(119,223,196,.3);background:rgba(119,223,196,.06)}
.status.closed .d{width:6px;height:6px;border-radius:50%;background:var(--teal);box-shadow:0 0 8px var(--teal)}
.status.open{color:var(--gold);border:1px solid rgba(236,198,89,.3);background:rgba(236,198,89,.06)}

/* article foot / next */
.art-foot{max-width:var(--measure);margin:56px 0 0;padding-top:26px;border-top:1px solid var(--line);color:var(--muted);font:500 13px/1.6 var(--mono)}
.art-foot .sig{color:var(--dim)}
.art-foot .sig b{color:var(--lav)}

/* motion — gentle load reveal */
@media (prefers-reduced-motion:no-preference){
  .reveal{opacity:0;transform:translateY(10px);animation:rise .6s var(--ease) forwards}
  .reveal.d1{animation-delay:.05s}.reveal.d2{animation-delay:.12s}.reveal.d3{animation-delay:.2s}.reveal.d4{animation-delay:.28s}
  @keyframes rise{to{opacity:1;transform:none}}
}

/* ---------- responsive ---------- */
@media (max-width:820px){
  .pinned{grid-template-columns:1fr}
  .side{grid-template-rows:none}
  .feed-item{grid-template-columns:1fr;gap:12px}
  .feed-item .rail{display:flex;gap:16px}
  .nav-links a:not(.ext){display:none}
}
@media (max-width:560px){
  .wrap,.nav-in{padding-left:20px;padding-right:20px}
  body{font-size:16px}
}

/* ---- generated hero illustrations (Flux, style TSN) ---- */
.art-hero{width:100%;aspect-ratio:1024/430;object-fit:cover;border-radius:14px;
  border:1px solid var(--line-strong);display:block;margin:0 0 30px;
  box-shadow:0 20px 64px rgba(0,0,0,.45)}
.card-hero{width:100%;height:172px;object-fit:cover;border-radius:11px;
  border:1px solid var(--line);display:block;margin:0 0 16px}
.side .card-hero{height:108px}
.feed-thumb{width:132px;height:84px;object-fit:cover;border-radius:8px;
  border:1px solid var(--line);display:block;margin:0 0 12px}
@media (max-width:640px){.feed-thumb{width:100%;height:120px}}