/* =========================================================================
   Abtin Shahidi — personal site
   Design system: "Deep Field / Observatory Catalog"
   Palette derived from emission-line false-color astronomy on a deep-field sky;
   typography pairs an editorial serif (Fraunces) with a technical sans
   (IBM Plex Sans) and a catalog/readout mono (IBM Plex Mono).
   ========================================================================= */

/* ----- Fonts (self-hosted, no external requests) ----- */
@font-face{font-family:"Fraunces";src:url("fonts/Fraunces-var.woff2") format("woff2");
  font-weight:100 900;font-stretch:75% 125%;font-style:normal;font-display:swap;}
@font-face{font-family:"Plex";src:url("fonts/IBMPlexSans-Regular.woff2") format("woff2");
  font-weight:400;font-style:normal;font-display:swap;}
@font-face{font-family:"Plex";src:url("fonts/IBMPlexSans-Italic.woff2") format("woff2");
  font-weight:400;font-style:italic;font-display:swap;}
@font-face{font-family:"Plex";src:url("fonts/IBMPlexSans-Medium.woff2") format("woff2");
  font-weight:500;font-style:normal;font-display:swap;}
@font-face{font-family:"Plex";src:url("fonts/IBMPlexSans-SemiBold.woff2") format("woff2");
  font-weight:600;font-style:normal;font-display:swap;}
@font-face{font-family:"PlexMono";src:url("fonts/IBMPlexMono-Regular.woff2") format("woff2");
  font-weight:400;font-style:normal;font-display:swap;}
@font-face{font-family:"PlexMono";src:url("fonts/IBMPlexMono-Medium.woff2") format("woff2");
  font-weight:500;font-style:normal;font-display:swap;}

/* ----- Design tokens ----- */
:root{
  /* deep field */
  --bg:#0a0e1a;
  --bg-2:#0c1120;
  --panel:#111829;
  --panel-hi:#18213a;
  --line:rgba(233,238,249,.09);
  --line-2:rgba(233,238,249,.16);
  /* starlight text */
  --text:#e9eef9;
  --dim:#a9b2c8;
  --mute:#727c96;
  /* spectral accents */
  --gold:#f4b740;      /* star / Na-D emission */
  --cyan:#54c8d6;      /* [OIII] / hot star */
  --violet:#a684f0;    /* plasma / catalog point */
  --rose:#f2789a;      /* Hα */
  --gold-12:rgba(244,183,64,.12);
  --cyan-12:rgba(84,200,214,.12);
  /* type */
  --serif:"Fraunces",Georgia,"Times New Roman",serif;
  --sans:"Plex","Helvetica Neue",Arial,sans-serif;
  --mono:"PlexMono",ui-monospace,"SFMono-Regular",Menlo,monospace;
  /* layout */
  --maxw:1200px;
  --wide:1340px;
  --gutter:clamp(1.25rem,5vw,3rem);
  --radius:16px;
  --radius-sm:10px;
  --sect:clamp(4.5rem,9vw,8.5rem);
  --ease:cubic-bezier(.2,.7,.2,1);
}

/* ----- Reset ----- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto;}}
body{margin:0;background:var(--bg);color:var(--text);
  font-family:var(--sans);font-size:clamp(1rem,.96rem + .2vw,1.075rem);
  line-height:1.72;font-weight:400;-webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;overflow-x:hidden;}
img,svg,canvas{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;}
h1,h2,h3,h4{margin:0;font-family:var(--serif);font-weight:460;
  font-optical-sizing:auto;line-height:1.05;letter-spacing:-.015em;}
p{margin:0 0 1.05em;}
::selection{background:var(--gold);color:#1a1205;}

/* ----- Ambient deep-field background ----- */
body::before{
  content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(1100px 700px at 82% -8%, rgba(84,200,214,.10), transparent 60%),
    radial-gradient(900px 620px at 6% 4%, rgba(166,132,240,.10), transparent 58%),
    radial-gradient(1200px 900px at 50% 118%, rgba(244,183,64,.07), transparent 60%),
    var(--bg);
}
body::after{ /* faint star grain */
  content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;opacity:.5;
  background-image:
    radial-gradient(1px 1px at 20% 30%, rgba(255,255,255,.55), transparent),
    radial-gradient(1px 1px at 70% 65%, rgba(255,255,255,.4), transparent),
    radial-gradient(1px 1px at 40% 80%, rgba(255,255,255,.35), transparent),
    radial-gradient(1px 1px at 88% 22%, rgba(255,255,255,.4), transparent),
    radial-gradient(1px 1px at 55% 12%, rgba(255,255,255,.3), transparent);
  background-size:auto;
}

/* ----- Shared helpers ----- */
.wrap{max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter);}
.wrap-wide{max-width:var(--wide);margin-inline:auto;padding-inline:var(--gutter);}
.eyebrow{font-family:var(--mono);font-size:.72rem;letter-spacing:.22em;
  text-transform:uppercase;color:var(--gold);font-weight:500;
  display:inline-flex;align-items:center;gap:.6em;}
.eyebrow::before{content:"";width:1.6em;height:1px;background:var(--gold);opacity:.7;}
.eyebrow--cyan{color:var(--cyan);}
.eyebrow--cyan::before{background:var(--cyan);}
.mono{font-family:var(--mono);}
.lead{font-size:clamp(1.1rem,1.02rem + .5vw,1.32rem);line-height:1.6;color:var(--dim);}
.section{padding-block:var(--sect);position:relative;}
.section-head{max-width:62ch;margin-bottom:clamp(2.2rem,4vw,3.4rem);}
.section-head h2{font-size:clamp(2rem,1.4rem + 2.6vw,3.1rem);margin:.55rem 0 0;}
.section-head p{margin-top:1rem;color:var(--dim);}
.divider{height:1px;background:var(--line);border:0;margin:0;}

/* accent links inside prose */
.prose a{color:var(--text);background-image:linear-gradient(var(--gold),var(--gold));
  background-size:100% 1px;background-position:0 1.15em;background-repeat:no-repeat;
  transition:background-size .3s var(--ease),color .2s;padding-bottom:1px;}
.prose a:hover{color:var(--gold);}

/* ============================ NAV ============================ */
.nav{position:sticky;top:0;z-index:50;
  background:rgba(10,14,26,.72);backdrop-filter:blur(14px) saturate(1.3);
  border-bottom:1px solid var(--line);}
.nav__inner{display:flex;align-items:center;gap:1.4rem;
  min-height:64px;max-width:var(--wide);margin-inline:auto;padding-inline:var(--gutter);}
.brand{display:flex;align-items:center;gap:.7rem;margin-right:auto;font-weight:500;}
.brand__mark{width:30px;height:30px;flex:0 0 auto;}
.brand__name{font-family:var(--serif);font-size:1.12rem;letter-spacing:-.01em;}
.brand__tag{font-family:var(--mono);font-size:.62rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--mute);display:block;line-height:1;margin-top:.15rem;}
.nav__links{display:flex;align-items:center;gap:.35rem;list-style:none;margin:0;padding:0;}
.nav__links a{font-family:var(--mono);font-size:.78rem;letter-spacing:.04em;
  color:var(--dim);padding:.5rem .7rem;border-radius:8px;position:relative;
  transition:color .2s;}
.nav__links a::after{content:"";position:absolute;left:.7rem;right:.7rem;bottom:.28rem;
  height:1px;background:var(--gold);transform:scaleX(0);transform-origin:left;
  transition:transform .28s var(--ease);}
.nav__links a:hover{color:var(--text);}
.nav__links a:hover::after,.nav__links a[aria-current="page"]::after{transform:scaleX(1);}
.nav__links a[aria-current="page"]{color:var(--text);}
.nav__cta{font-family:var(--mono);font-size:.76rem;letter-spacing:.04em;
  border:1px solid var(--line-2);color:var(--text);padding:.5rem .9rem;border-radius:999px;
  transition:border-color .2s,background .2s,color .2s;white-space:nowrap;}
.nav__cta:hover{border-color:var(--gold);color:var(--gold);background:var(--gold-12);}
.nav__toggle{display:none;background:none;border:1px solid var(--line-2);color:var(--text);
  width:42px;height:38px;border-radius:9px;cursor:pointer;align-items:center;justify-content:center;}
.nav__toggle svg{width:20px;height:20px;}

/* ============================ HERO ============================ */
.hero{position:relative;overflow:hidden;
  padding-top:clamp(3rem,7vw,6rem);padding-bottom:clamp(3.5rem,8vw,7rem);}
.hero__grid{display:grid;grid-template-columns:1.06fr .94fr;gap:clamp(2rem,4vw,4rem);
  align-items:center;max-width:var(--wide);margin-inline:auto;padding-inline:var(--gutter);}
.hero__title{font-size:clamp(2.7rem,1.7rem + 4.4vw,5.4rem);margin:1.1rem 0 0;
  letter-spacing:-.025em;line-height:.98;font-weight:430;}
.hero__title em{font-style:italic;color:var(--gold);font-weight:430;}
.hero__sub{margin-top:1.5rem;max-width:46ch;color:var(--dim);
  font-size:clamp(1.05rem,1rem + .4vw,1.22rem);line-height:1.6;}
.hero__cta{display:flex;flex-wrap:wrap;gap:.8rem;margin-top:2.1rem;}
.hero__meta{display:flex;flex-wrap:wrap;gap:.5rem 1.4rem;margin-top:2.4rem;
  font-family:var(--mono);font-size:.75rem;color:var(--mute);letter-spacing:.03em;}
.hero__meta span{display:inline-flex;align-items:center;gap:.5em;}
.hero__meta i{width:6px;height:6px;border-radius:50%;background:var(--cyan);
  box-shadow:0 0 8px var(--cyan);font-style:normal;}
.hero__visual{position:relative;aspect-ratio:1/1;width:100%;
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  background:linear-gradient(160deg,rgba(24,33,58,.5),rgba(10,14,26,.2));}
.hero__visual canvas{position:absolute;inset:0;width:100%;height:100%;}
.hero__frame{position:absolute;inset:0;pointer-events:none;z-index:2;
  font-family:var(--mono);font-size:.6rem;letter-spacing:.12em;color:var(--mute);}
.hero__frame span{position:absolute;text-transform:uppercase;}
.hero__frame .tl{top:.9rem;left:1rem;color:var(--cyan);opacity:.8;}
.hero__frame .tr{top:.9rem;right:1rem;}
.hero__frame .bl{bottom:.9rem;left:1rem;}
.hero__frame .br{bottom:.9rem;right:1rem;color:var(--gold);opacity:.8;}
.hero__corner{position:absolute;width:14px;height:14px;border:1px solid var(--line-2);}
.hero__corner.c1{top:8px;left:8px;border-right:0;border-bottom:0;}
.hero__corner.c2{top:8px;right:8px;border-left:0;border-bottom:0;}
.hero__corner.c3{bottom:8px;left:8px;border-right:0;border-top:0;}
.hero__corner.c4{bottom:8px;right:8px;border-left:0;border-top:0;}

/* ============================ BUTTONS ============================ */
.btn{display:inline-flex;align-items:center;gap:.6em;font-family:var(--mono);
  font-size:.82rem;letter-spacing:.03em;font-weight:500;padding:.8rem 1.3rem;
  border-radius:999px;cursor:pointer;transition:transform .2s var(--ease),
  background .2s,border-color .2s,color .2s,box-shadow .2s;border:1px solid transparent;}
.btn svg{width:15px;height:15px;}
.btn--primary{background:var(--gold);color:#1a1205;box-shadow:0 0 0 rgba(244,183,64,0);}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 10px 30px -10px rgba(244,183,64,.6);}
.btn--ghost{border-color:var(--line-2);color:var(--text);}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan);background:var(--cyan-12);transform:translateY(-2px);}
.btn--sm{padding:.55rem 1rem;font-size:.76rem;}

/* ============================ STATS STRIP ============================ */
.stats{border-block:1px solid var(--line);background:
  linear-gradient(180deg,rgba(17,24,41,.4),transparent);}
.stats__inner{max-width:var(--wide);margin-inline:auto;padding:clamp(1.6rem,3vw,2.4rem) var(--gutter);
  display:grid;grid-template-columns:repeat(5,1fr);gap:1px;
  background:var(--line);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;margin-top:0;}
.stat{background:var(--bg);padding:1.3rem 1.4rem;}
.stat__num{font-family:var(--serif);font-size:clamp(1.7rem,1.3rem + 1.4vw,2.5rem);
  font-weight:460;letter-spacing:-.02em;line-height:1;color:var(--text);}
.stat__num b{color:var(--gold);font-weight:inherit;}
.stat__label{font-family:var(--mono);font-size:.68rem;letter-spacing:.12em;
  text-transform:uppercase;color:var(--mute);margin-top:.6rem;line-height:1.4;}

/* ============================ ABOUT / CURRENT ============================ */
.about__grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:clamp(2rem,5vw,4.5rem);align-items:start;}
.portrait{position:relative;}
.portrait img{width:100%;height:auto;border-radius:var(--radius);border:1px solid var(--line-2);
  filter:saturate(1.05) contrast(1.02);}
.portrait__tag{position:absolute;left:1rem;bottom:1rem;right:1rem;
  font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;color:var(--text);
  background:rgba(10,14,26,.7);backdrop-filter:blur(8px);border:1px solid var(--line-2);
  border-radius:10px;padding:.6rem .8rem;line-height:1.5;}
.chips{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1.6rem;}
.chip{font-family:var(--mono);font-size:.72rem;letter-spacing:.03em;color:var(--dim);
  border:1px solid var(--line);border-radius:999px;padding:.4rem .8rem;background:var(--panel);}
.chip--gold{border-color:rgba(244,183,64,.4);color:var(--gold);}

/* ============================ WORK CARDS ============================ */
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(1rem,2vw,1.5rem);}
.card{position:relative;display:flex;flex-direction:column;
  background:linear-gradient(180deg,var(--panel),var(--bg-2));
  border:1px solid var(--line);border-radius:var(--radius);padding:clamp(1.5rem,2.5vw,2.2rem);
  overflow:hidden;transition:border-color .3s,transform .3s var(--ease),background .3s;}
.card::after{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  background:radial-gradient(420px 200px at 100% 0,var(--_glow,rgba(244,183,64,.14)),transparent 70%);
  opacity:0;transition:opacity .35s;}
.card:hover{border-color:var(--line-2);transform:translateY(-4px);}
.card:hover::after{opacity:1;}
.card__idx{font-family:var(--mono);font-size:.72rem;letter-spacing:.14em;color:var(--mute);}
.card__title{font-size:1.5rem;margin:.9rem 0 .5rem;letter-spacing:-.01em;}
.card__title .arw{display:inline-block;transition:transform .3s var(--ease);color:var(--gold);}
.card:hover .card__title .arw{transform:translate(4px,-4px);}
.card__desc{color:var(--dim);font-size:.98rem;margin:0;}
.card__tags{margin-top:auto;padding-top:1.3rem;display:flex;flex-wrap:wrap;gap:.4rem;}
.card__tags span{font-family:var(--mono);font-size:.68rem;color:var(--mute);
  border:1px solid var(--line);border-radius:6px;padding:.25rem .5rem;}
.card__link{position:absolute;inset:0;}
.card--gold{--_glow:rgba(244,183,64,.16);}
.card--cyan{--_glow:rgba(84,200,214,.16);}
.card--violet{--_glow:rgba(166,132,240,.16);}
.card--rose{--_glow:rgba(242,120,154,.16);}

/* ============================ PUBLICATION / CATALOG ROWS ============================ */
.catalog{border-top:1px solid var(--line);}
.crow{display:grid;grid-template-columns:auto 1fr auto;gap:1.2rem;align-items:baseline;
  padding:1.5rem 0;border-bottom:1px solid var(--line);position:relative;
  transition:padding-left .3s var(--ease);}
.crow:hover{padding-left:.8rem;}
.crow::before{content:"";position:absolute;left:0;top:0;bottom:0;width:2px;
  background:var(--gold);transform:scaleY(0);transform-origin:top;transition:transform .3s var(--ease);}
.crow:hover::before{transform:scaleY(1);}
.crow__year{font-family:var(--mono);font-size:.85rem;color:var(--gold);letter-spacing:.02em;}
.crow__body{min-width:0;}
.crow__title{font-family:var(--serif);font-size:1.28rem;line-height:1.25;letter-spacing:-.01em;
  margin:0 0 .35rem;color:var(--text);transition:color .2s;}
.crow:hover .crow__title{color:var(--gold);}
.crow__meta{font-family:var(--mono);font-size:.76rem;color:var(--mute);letter-spacing:.02em;}
.crow__meta .lead-author{color:var(--cyan);}
.crow__links{display:flex;gap:.5rem;white-space:nowrap;}
.crow__links a{font-family:var(--mono);font-size:.72rem;color:var(--dim);
  border:1px solid var(--line);border-radius:6px;padding:.3rem .6rem;transition:.2s;}
.crow__links a:hover{border-color:var(--gold);color:var(--gold);}
.tag-first{font-family:var(--mono);font-size:.62rem;letter-spacing:.1em;text-transform:uppercase;
  color:#1a1205;background:var(--gold);border-radius:5px;padding:.15rem .45rem;margin-left:.6rem;
  vertical-align:middle;}

/* ============================ VIZ GALLERY ============================ */
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));
  gap:clamp(1rem,2vw,1.4rem);}
.viz{position:relative;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;background:var(--panel);transition:border-color .3s,transform .3s var(--ease);}
.viz:hover{border-color:var(--line-2);transform:translateY(-3px);}
.viz__img{aspect-ratio:16/11;overflow:hidden;background:#05070f;}
.viz__img img{width:100%;height:100%;object-fit:cover;object-position:center;
  transition:transform .5s var(--ease);}
.viz:hover .viz__img img{transform:scale(1.04);}
.viz__body{padding:1.1rem 1.2rem 1.3rem;}
.viz__kicker{font-family:var(--mono);font-size:.66rem;letter-spacing:.12em;
  text-transform:uppercase;color:var(--cyan);}
.viz__title{font-size:1.15rem;margin:.5rem 0 .4rem;}
.viz__desc{font-size:.9rem;color:var(--dim);margin:0;}
.viz--wide{grid-column:span 2;}
.viz--feature .viz__img{aspect-ratio:21/10;}

/* ============================ TEACHING ============================ */
.course{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  background:linear-gradient(180deg,var(--panel),var(--bg-2));}
.course__head{padding:clamp(1.6rem,3vw,2.4rem);border-bottom:1px solid var(--line);}
.course__title{font-size:clamp(1.6rem,1.2rem + 1.4vw,2.2rem);margin:.6rem 0 .5rem;}
.course__body{padding:clamp(1.6rem,3vw,2.4rem);}
.grid-links{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:.7rem;}
.tlink{display:flex;align-items:center;gap:.7rem;padding:.85rem 1rem;border:1px solid var(--line);
  border-radius:10px;background:var(--bg);transition:.25s;font-size:.92rem;}
.tlink:hover{border-color:var(--gold);color:var(--gold);transform:translateY(-2px);background:var(--panel);}
.tlink .n{font-family:var(--mono);font-size:.72rem;color:var(--mute);}
.tlink:hover .n{color:var(--gold);}
.pill-row{display:flex;flex-wrap:wrap;gap:.5rem;margin:.4rem 0 0;}
.pill{font-family:var(--mono);font-size:.72rem;color:var(--dim);border:1px solid var(--line);
  border-radius:999px;padding:.35rem .8rem;}

/* ============================ TIMELINE (CV) ============================ */
.tl-list{list-style:none;margin:0;padding:0;}
.tl-item{position:relative;padding:0 0 2.2rem 2rem;border-left:1px solid var(--line);}
.tl-item:last-child{border-left-color:transparent;padding-bottom:0;}
.tl-item::before{content:"";position:absolute;left:-5px;top:.3rem;width:9px;height:9px;
  border-radius:50%;background:var(--bg);border:2px solid var(--gold);}
.tl-item--cyan::before{border-color:var(--cyan);}
.tl-when{font-family:var(--mono);font-size:.74rem;letter-spacing:.06em;color:var(--gold);}
.tl-role{font-family:var(--serif);font-size:1.28rem;margin:.35rem 0 .15rem;}
.tl-where{font-family:var(--mono);font-size:.8rem;color:var(--mute);margin-bottom:.7rem;}
.tl-item ul{margin:.4rem 0 0;padding-left:1.1rem;color:var(--dim);font-size:.95rem;}
.tl-item ul li{margin-bottom:.35rem;}

/* generic two-col content */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(1.4rem,3vw,3rem);}
.split-3{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(1rem,2vw,1.4rem);}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:clamp(1.4rem,2.5vw,2rem);}
.panel h3{font-size:1.3rem;margin-bottom:.7rem;}
.kv{font-family:var(--mono);font-size:.85rem;color:var(--dim);line-height:1.9;}
.kv b{color:var(--text);font-weight:500;}

/* method blocks (industry/research) */
.method{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);
  padding:clamp(1.5rem,2.5vw,2.2rem);position:relative;overflow:hidden;}
.method__tag{font-family:var(--mono);font-size:.68rem;letter-spacing:.14em;text-transform:uppercase;color:var(--cyan);}
.method__title{font-size:1.45rem;margin:.7rem 0 .6rem;}
.method__stat{font-family:var(--serif);color:var(--gold);font-size:1rem;}
.method p{color:var(--dim);margin:.5rem 0 0;font-size:.97rem;}

/* ============================ PAGE HEADER (interior) ============================ */
.phead{padding-top:clamp(3rem,6vw,5rem);padding-bottom:clamp(1.5rem,3vw,2.5rem);}
.phead h1{font-size:clamp(2.4rem,1.6rem + 3vw,4rem);margin:.8rem 0 0;letter-spacing:-.02em;}
.phead p{margin-top:1.2rem;max-width:60ch;color:var(--dim);}

/* ============================ FOOTER ============================ */
.footer{border-top:1px solid var(--line);margin-top:var(--sect);
  background:linear-gradient(180deg,transparent,rgba(17,24,41,.5));}
.footer__inner{max-width:var(--wide);margin-inline:auto;padding:clamp(3rem,6vw,5rem) var(--gutter) 2.5rem;}
.footer__grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:2.5rem;align-items:start;}
.footer__big{font-family:var(--serif);font-size:clamp(1.6rem,1.2rem + 1.5vw,2.4rem);
  letter-spacing:-.02em;line-height:1.1;max-width:20ch;}
.footer__big a{color:var(--gold);}
.footer h4{font-family:var(--mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--mute);font-weight:500;margin:0 0 1rem;}
.footer ul{list-style:none;margin:0;padding:0;}
.footer li{margin-bottom:.6rem;}
.footer li a{color:var(--dim);transition:color .2s;display:inline-flex;align-items:center;gap:.5em;font-size:.95rem;}
.footer li a:hover{color:var(--gold);}
.footer__bar{display:flex;flex-wrap:wrap;gap:1rem;justify-content:space-between;
  margin-top:3rem;padding-top:1.5rem;border-top:1px solid var(--line);
  font-family:var(--mono);font-size:.72rem;color:var(--mute);letter-spacing:.03em;}

/* ============================ SCROLL REVEAL ============================ */
/* progressive enhancement: only hidden when JS is active */
.reveal{transition:opacity .7s var(--ease),transform .7s var(--ease);}
html.js .reveal:not(.in){opacity:0;transform:translateY(22px);}
.reveal.in{opacity:1;transform:none;}
@media (prefers-reduced-motion:reduce){
  html.js .reveal:not(.in){opacity:1;transform:none;}
  .reveal{opacity:1;transform:none;transition:none;}
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;
    transition-duration:.001ms !important;}
}

/* ============================ FOCUS ============================ */
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:4px;}
.skip{position:absolute;left:-999px;top:0;background:var(--gold);color:#1a1205;
  padding:.6rem 1rem;border-radius:0 0 8px 0;font-family:var(--mono);font-size:.8rem;z-index:100;}
.skip:focus{left:0;}

/* ============================ RESPONSIVE ============================ */
@media (max-width:1080px){
  .stats__inner{grid-template-columns:repeat(3,1fr);}
  .stat:nth-child(4),.stat:nth-child(5){border-top:1px solid var(--line);}
}
@media (max-width:900px){
  .nav__links,.nav__cta{display:none;}
  .nav__toggle{display:inline-flex;}
  .nav.open .nav__links{display:flex;position:absolute;top:64px;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;background:var(--bg-2);
    border-bottom:1px solid var(--line);padding:.5rem var(--gutter) 1.2rem;}
  .nav.open .nav__links a{padding:.85rem .2rem;border-bottom:1px solid var(--line);font-size:.95rem;}
  .nav.open .nav__links a::after{display:none;}
  .hero__grid{grid-template-columns:1fr;}
  .hero__visual{max-width:460px;order:-1;}
  .about__grid{grid-template-columns:1fr;}
  .portrait{max-width:360px;}
  .cards{grid-template-columns:1fr;}
  .split,.split-3{grid-template-columns:1fr;}
  .footer__grid{grid-template-columns:1fr 1fr;}
  .footer__big{grid-column:1/-1;margin-bottom:.5rem;}
  .viz--wide{grid-column:auto;}
}
@media (max-width:560px){
  .stats__inner{grid-template-columns:repeat(2,1fr);}
  .stat:nth-child(5){grid-column:1/-1;}
  .crow{grid-template-columns:auto 1fr;gap:.4rem 1rem;}
  .crow__links{grid-column:2;justify-content:flex-start;margin-top:.4rem;}
  .footer__grid{grid-template-columns:1fr;}
}

/* lecture/reading pages (converted notebooks) */
.reading{max-width:820px;margin-inline:auto;padding-inline:var(--gutter);}
.reading h1,.reading h2,.reading h3{font-family:var(--serif);margin:2.2rem 0 .9rem;line-height:1.15;}
.reading h1{font-size:clamp(2rem,1.5rem + 2vw,3rem);}
.reading h2{font-size:1.7rem;padding-top:1rem;border-top:1px solid var(--line);}
.reading h3{font-size:1.3rem;}
.reading p,.reading li{color:var(--dim);}
.reading img{margin:1.6rem auto;border-radius:10px;border:1px solid var(--line);background:#fff;}
.reading a{color:var(--gold);}
.reading pre{background:#070b16;border:1px solid var(--line);border-radius:10px;
  padding:1rem 1.2rem;overflow:auto;font-family:var(--mono);font-size:.85rem;color:#cdd6ea;}
.reading code{font-family:var(--mono);font-size:.88em;color:var(--cyan);
  background:rgba(84,200,214,.08);padding:.1em .35em;border-radius:4px;}
.reading pre code{background:none;color:inherit;padding:0;}
.reading table{border-collapse:collapse;width:100%;font-size:.85rem;margin:1.4rem 0;}
.reading th,.reading td{border:1px solid var(--line);padding:.5rem .7rem;text-align:left;}
.reading blockquote{border-left:2px solid var(--gold);margin:1.4rem 0;padding-left:1.2rem;color:var(--mute);}

/* ============================ FIGURE PLATES (real paper figures) ============================ */
.plates{display:grid;gap:clamp(1rem,2vw,1.6rem);}
.plates-2{grid-template-columns:1fr 1fr;}
.plate{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  background:var(--panel);transition:border-color .3s,transform .3s var(--ease);display:flex;flex-direction:column;}
.plate:hover{border-color:var(--line-2);transform:translateY(-3px);}
.plate__fig{background:#eef1f7;display:flex;align-items:center;justify-content:center;
  padding:clamp(.7rem,1.6vw,1.2rem);}
.plate__fig img{width:100%;height:auto;display:block;border-radius:4px;}
.plate--tall .plate__fig img{width:auto;max-width:100%;max-height:640px;margin-inline:auto;}
.plate__cap{padding:1.1rem 1.35rem 1.35rem;}
.plate__cap .k{font-family:var(--mono);font-size:.66rem;letter-spacing:.12em;
  text-transform:uppercase;color:var(--cyan);}
.plate__cap h3{font-size:1.22rem;margin:.5rem 0 .45rem;}
.plate__cap p{font-size:.92rem;color:var(--dim);margin:0;}
/* paper-matte treatment for gallery cards holding real figures */
.viz--paper .viz__img{background:#eef1f7;}
.viz--paper .viz__img img{object-fit:contain;padding:10px;}
.viz--paper:hover .viz__img img{transform:none;}
@media (max-width:900px){ .plates-2{grid-template-columns:1fr;} }

/* findings list */
.findings{list-style:none;margin:1.4rem 0 0;padding:0;display:grid;gap:.9rem;}
.findings li{position:relative;padding-left:1.6rem;color:var(--dim);font-size:.97rem;}
.findings li::before{content:"";position:absolute;left:0;top:.55em;width:8px;height:8px;
  border-radius:50%;background:var(--gold);box-shadow:0 0 8px var(--gold);}
.findings li b{color:var(--text);font-weight:500;}

/* external-link-styled teaching notebook links */
.tlink--ext .n{color:var(--cyan);}
.tlink svg{width:14px;height:14px;margin-left:auto;opacity:.6;flex:0 0 auto;}
.tlink:hover svg{opacity:1;}