/* praevidere — INSTRUMENT variant. The void is the canvas; the chrome measures.
   Geist display, Instrument Serif for the one editorial moment per page, iris accent. */
:root{
  --serif:"Taviraj","Iowan Old Style",Palatino,Georgia,serif;
  --it:"Taviraj","Iowan Old Style",Georgia,serif;
  --sans:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
  --paper:#050507;
  --ink:#f2f3f5; --ink-body:rgba(242,243,245,.74); --ink-label:rgba(242,243,245,.55); --ink-quiet:rgba(242,243,245,.4);
  --hairline:rgba(255,255,255,.08);
  --acc:#4169e1; --acc2:#8fafe8; --acc-deep:var(--acc2);            /* iris — the only chroma */
}
*{box-sizing:border-box;margin:0;padding:0}
body{background:var(--paper);color:var(--ink-body);font-family:var(--sans);font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:hidden}
::selection{background:var(--acc);color:#050507}
#bg{position:fixed;inset:0;width:100vw;height:100vh;display:block;z-index:0}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- landing chrome ---------- */
.bar{
  position:fixed;left:0;right:0;bottom:0;z-index:2;
  background:linear-gradient(180deg,rgba(5,5,7,0),rgba(5,5,7,.82) 40%,var(--paper));
  display:flex;justify-content:space-between;align-items:flex-end;
  padding:0 28px calc(22px + env(safe-area-inset-bottom,0px));
  opacity:0;transform:translateY(10px);
  transition:opacity 1s cubic-bezier(.16,1,.3,1),transform 1s cubic-bezier(.16,1,.3,1);
}
body.resolved .bar{opacity:1;transform:none}
.bar{pointer-events:none}
.bar a,.bar .soc{pointer-events:auto}
/* #NOTE: the landing keeps the gradient fade over the field; subpage footers mirror the header — a solid blurred plate so the sampling never reads through the legal line. Symmetric padding + centered items: the plate hugs the row, header-like */
footer.bar{background:rgba(5,5,7,.72);border-top:1px solid var(--hairline);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);align-items:center;padding:16px 28px calc(16px + env(safe-area-inset-bottom,0px))}
.links{display:flex;gap:34px}
.links a{
  font-family:var(--mono);font-size:11px;letter-spacing:.24em;font-weight:700;color:var(--ink);
  text-decoration:none;display:flex;gap:10px;align-items:baseline;padding:6px 0;
  border-top:1px solid transparent;transition:color .3s,border-color .3s;
}
.links .n{font-size:9px;letter-spacing:.1em;color:var(--acc)}
.links a:hover{color:var(--acc2);border-top-color:var(--acc)}
.links a:focus-visible{outline:1px solid var(--acc);outline-offset:4px}
.fine{display:flex;gap:26px;align-items:baseline;font-family:var(--mono);font-size:9.5px;letter-spacing:.26em;font-weight:700;color:var(--ink-quiet)}
.fine a{color:var(--ink-label);text-decoration:none;transition:color .3s;padding:6px 0}
.fine a:hover{color:var(--acc2)}
.wm:focus-visible,.nav a:focus-visible,.fine a:focus-visible,.soc:focus-visible,.sec a:focus-visible,.cta .mail:focus-visible,.index a:focus-visible{outline:1px solid var(--acc);outline-offset:4px}
.soc-links{display:flex;gap:10px;align-items:center;align-self:center}
.soc{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;border:1px solid var(--hairline);color:var(--ink-quiet);transition:border-color .3s,color .3s}
.soc svg{width:12px;height:12px;display:block}
.soc:hover{border-color:var(--acc2);color:var(--acc2)}
.fine a.here{color:var(--acc-deep)}
/* ---------- subpage chrome ---------- */
.top{position:fixed;top:0;left:0;right:0;z-index:10;display:flex;justify-content:space-between;align-items:baseline;padding:18px 30px;background:rgba(5,5,7,.72);border-bottom:1px solid var(--hairline);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px)}
.wm{display:inline-flex;align-items:center;gap:8px;font-family:var(--serif);font-weight:500;font-size:21px;letter-spacing:.04em;color:var(--ink);text-decoration:none;transition:color .3s}
.wm-mark{width:1.25em;height:1.25em;display:block}
.wm span{color:var(--acc);letter-spacing:0;margin:0 -.16em}
.wm:hover{color:var(--acc-deep)}
.nav{display:flex;gap:28px}
.nav a{font-family:var(--mono);font-size:10px;letter-spacing:.26em;font-weight:700;color:var(--ink-label);text-decoration:none;transition:color .3s;padding:8px 0}
.nav a:hover{color:var(--acc2)}
.nav a.here{color:var(--acc-deep)}

main{
  position:relative;z-index:1;max-width:720px;margin:0 auto;padding:15vh 30px 14vh;
  background:
    radial-gradient(ellipse 130% 100% at 50% 42%, rgba(5,5,7,.97) 0%, rgba(5,5,7,.84) 55%, rgba(5,5,7,.42) 100%),
    linear-gradient(180deg, rgba(5,5,7,.5) 0%, rgba(5,5,7,0) 28%, rgba(5,5,7,0) 58%, rgba(5,5,7,.72) 100%);
}
.kicker{display:flex;align-items:center;gap:16px;font-family:var(--mono);font-size:10px;letter-spacing:.36em;font-weight:700;color:var(--acc);margin-bottom:4vh}
.kicker::before{content:"";width:44px;height:1px;background:var(--hairline)}
h1{font-family:var(--serif);font-weight:500;font-size:clamp(36px,5.4vw,60px);line-height:1.12;letter-spacing:0;color:var(--ink)}
h1.h-flow{font-size:clamp(30px,4.2vw,50px);line-height:1.16}
h1 em{font-family:var(--it);font-style:italic;font-weight:400;letter-spacing:0;color:var(--acc)}
.lede{margin-top:3.5vh;font-family:var(--sans);font-size:17px;line-height:1.7;color:var(--ink-body)}
.status{display:inline-flex;gap:14px;align-items:center;margin-top:4vh;font-family:var(--mono);font-size:10px;letter-spacing:.26em;font-weight:700;color:var(--ink-label)}
.status i{width:7px;height:7px;border-radius:50%;background:var(--acc);display:block}

.spec{margin:10vh 0;background:rgba(15,16,20,.72);border:1px solid var(--hairline);padding:34px 4.5% 26px;border-radius:6px;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.spec-row{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap;font-family:var(--mono);font-size:10px;letter-spacing:.24em;font-weight:700;color:var(--ink-label)}
.spec-head{padding-bottom:18px;border-bottom:1px solid var(--hairline)}
.spec-head b{color:var(--acc)}
.spec-q{font-family:var(--sans);font-weight:400;font-size:clamp(19px,2.2vw,24px);line-height:1.5;color:var(--ink);margin:3vh 0 2vh}
.spec-q .pct{font-family:var(--it);font-style:italic;color:var(--acc)}
.spec-note{font-size:16px;line-height:1.7}
.spec-foot{margin-top:22px;padding-top:14px;border-top:1px solid var(--hairline)}
.q-kinds{font-family:var(--mono);font-size:9.5px;letter-spacing:.2em;font-weight:700;text-transform:uppercase;color:var(--ink-quiet);margin-bottom:12px}
.film-bar{position:absolute;left:0;right:0;bottom:0;display:flex;justify-content:flex-end;gap:8px;padding:34px 20px 12px;background:linear-gradient(180deg,rgba(5,5,7,0),rgba(5,5,7,.8));opacity:0;transition:opacity .35s cubic-bezier(.16,1,.3,1)}
.film:hover .film-bar,.film:focus-within .film-bar{opacity:1}
@media (hover:none){.film-bar{opacity:1}}
.film-btn{appearance:none;background:none;border:0;padding:6px;cursor:pointer;color:var(--acc);opacity:.85;transition:opacity .3s,transform .3s;display:inline-flex;align-items:center;justify-content:center}
.film-btn:hover{opacity:1;transform:scale(1.08)}
.film-btn svg{width:16px;height:16px;display:block;fill:currentColor}
.film-btn svg[hidden]{display:none}
.film-btn:hover{color:var(--ink)}
.film-btn:focus-visible{outline:1px solid var(--acc);outline-offset:3px}
.film-btn:disabled{color:var(--ink-quiet);cursor:default}
.film-fail{padding:18vh 24px;text-align:center;font-family:var(--mono);font-size:10px;letter-spacing:.22em;font-weight:700;color:var(--ink-label)}
.film{position:relative;border:1px solid var(--hairline);background:var(--paper);border-radius:4px;overflow:hidden}
.film video{display:block;width:100%;height:auto;cursor:pointer;border-radius:4px}
.film video:fullscreen,.film video:-webkit-full-screen{background:var(--paper)}

.cta{margin:12vh 0 9vh}
.cta h2{font-family:var(--it);font-style:italic;font-weight:400;font-size:clamp(30px,4vw,48px);line-height:1.15;color:var(--ink)}
.cta p{margin-top:2.5vh;max-width:540px}
.cta-line{margin-top:3.5vh}
.cta .mail{font-family:var(--sans);font-size:16px;color:var(--ink);text-decoration:none;border-bottom:1px solid var(--acc2);padding-bottom:1px;transition:color .35s,border-color .35s}
.cta .mail:hover{color:var(--acc-deep)}

/* blog index */
.index{list-style:none;margin-top:7vh;border-top:2px solid var(--ink)}
.index li{border-bottom:1px solid var(--hairline)}
.index a{display:grid;grid-template-columns:52px minmax(0,1fr) auto;gap:20px;align-items:baseline;padding:3.4vh 4px;text-decoration:none;color:var(--ink)}
.index .no{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;font-weight:700;color:var(--acc)}
.index .pt{font-family:var(--serif);font-weight:500;font-size:clamp(20px,2.4vw,26px);line-height:1.15;letter-spacing:-.015em;transition:color .3s}
.index .pa{margin-top:8px;font-size:15.5px;line-height:1.65;max-width:62ch;color:var(--ink-body)}
.index .dt{font-family:var(--mono);font-size:10px;letter-spacing:.12em;font-weight:700;color:var(--ink-label);white-space:nowrap;text-align:right}
.index a:hover .pt{color:var(--acc2)}

/* post glyphs — one seeded night sky per post, drawn by assets/glyph.js */
.gl{display:block}
.gl svg{display:block;width:100%;height:auto}
.index .gl{width:48px;margin-top:2px}
.gl-hero{width:88px;margin-bottom:4vh}

/* article */
article{position:relative;z-index:1;max-width:680px;margin:0 auto;padding:16vh 24px 14vh;background:
  radial-gradient(ellipse 135% 105% at 50% 40%, rgba(5,5,7,.97) 0%, rgba(5,5,7,.86) 55%, rgba(5,5,7,.5) 100%),
  linear-gradient(180deg, rgba(5,5,7,.6) 0%, rgba(5,5,7,.35) 30%, rgba(5,5,7,.35) 55%, rgba(5,5,7,.9) 100%)}
.meta{font-family:var(--mono);font-size:10px;letter-spacing:.3em;font-weight:700;color:var(--acc);margin-bottom:3.5vh}
article h1{font-size:clamp(30px,4.4vw,46px);line-height:1.08}
.standfirst{margin-top:3vh;font-family:var(--it);font-style:italic;font-size:22px;line-height:1.5;color:var(--ink-label)}
article h2{font-family:var(--serif);font-weight:500;font-size:24px;letter-spacing:-.01em;margin:7vh 0 2vh;color:var(--ink)}
article p{margin-bottom:2.4vh}
.math{border-left:2px solid var(--acc);padding:14px 18px;margin:3vh 0;background:rgba(15,16,20,.6);border-radius:0 4px 4px 0;overflow-x:auto;font-size:16px}
.math .katex{font-size:1.02em}
.math-fallback{font-family:var(--mono);font-size:12.5px;letter-spacing:.04em;line-height:2.2;color:var(--ink-label)}
.math-fallback b{color:var(--acc-deep)}
.foot-note{margin-top:8vh;padding-top:20px;border-top:1px solid var(--hairline);font-size:15px;color:var(--ink-quiet)}

/* about */
.sec{margin-top:9vh}
.sec h2{font-family:var(--mono);font-size:10.5px;letter-spacing:.36em;font-weight:700;color:var(--acc);margin-bottom:2.6vh}
.sec p{margin-bottom:2.2vh;max-width:640px}
.sec a{color:var(--ink);text-decoration:none;border-bottom:1px solid var(--acc2);padding-bottom:1px;transition:color .35s,border-color .35s}
.sec a:hover{color:var(--acc2);border-color:var(--acc2)}
.quote{font-family:var(--it);font-style:italic;font-size:clamp(20px,2.4vw,25px);line-height:1.5;color:var(--ink);border-left:2px solid var(--acc);padding-left:22px;margin:4vh 0}
.quote span{display:block;margin-top:12px;font-style:normal;font-family:var(--mono);font-size:10px;letter-spacing:.3em;font-weight:700;color:var(--acc-deep)}

@media (max-width:760px){
  .bar{flex-direction:column;align-items:flex-start;gap:14px;padding:0 18px 18px}
  /* #NOTE: measured on the landing, folded up for every page whose footer shares the bar markup — the 10px mono labels ride ~5px high in their 1.65 line box while the centered icon boxes track the box, so lift the icons onto the text line; .fine wraps instead of squeezing on a 320px phone */
  .bar .fine{flex-wrap:wrap;gap:10px 16px}
  .bar .fine a{padding:12px 0}
  .bar .soc{width:30px;height:30px}
  .bar .soc-links{position:relative;top:-5px}
  .top{padding:14px 18px;gap:12px;flex-wrap:wrap}
  .wm{font-size:15px;letter-spacing:.08em}
  .nav{gap:14px;flex-wrap:wrap;justify-content:flex-end}
  .nav a{font-size:9px;letter-spacing:.18em;padding:6px 0}
  main{padding:14vh 20px 8vh}
  .index a{grid-template-columns:36px minmax(0,1fr)}
  .index .gl{width:36px}
  .index .dt{grid-column:2;text-align:left}
  /* #NOTE: the fixed translucent scrim reads as broken when content scrolls beneath it on a phone — subpage footers become a solid block at the document end; the landing keeps its fixed bar over the canvas. position:relative (not static): #bg is a fixed z-index:0 layer that paints over normal-flow content, so the footer must stay positioned to keep its z-index */
  footer.bar{position:relative;z-index:1;background:var(--paper);border-top:1px solid var(--hairline);padding:18px 18px calc(18px + env(safe-area-inset-bottom,0px));transform:none}
  .film-btn{padding:14px}
}

/* reduced motion — strip the bar's entrance translate, keep the opacity fade */
@media (prefers-reduced-motion: reduce){
  .bar{transform:none;transition:opacity .3s}
}