/* ============================================================
   CESAR AYALA — Full-Stack AI Engineer
   Editorial near-monochrome system, dark canvas, one
   signal-orange accent.

   Breakpoint tiers: 1100 / 860 / 640 / 400
   Rhythm tokens:    --sy (plain sections) · --by (full-bleed bands)
   ============================================================ */

:root{
  /* palette — dark theme, signal orange */
  --canvas:#15140E;        /* near-black warm canvas */
  --canvas-2:#1F1D15;      /* slightly lifted panel */
  --ink:#F2F0E8;           /* warm off-white ink */
  --ink-soft:#CBC8BC;
  --muted:#8C8979;         /* warm gray */
  --hairline:#33312A;
  --accent:#FF5A1F;        /* signal orange */
  --on-accent:#15140E;     /* ink on accent */

  /* type */
  --sans:"Geist","Helvetica Neue",Helvetica,Arial,sans-serif;
  --mono:"Geist Mono",ui-monospace,"SF Mono",Menlo,monospace;

  /* headline weight */
  --hw:660;

  /* rhythm */
  --gutter:clamp(22px,6vw,80px);
  --sy:clamp(56px,7.5vw,104px);   /* plain section block padding */
  --by:clamp(52px,7vw,96px);      /* full-bleed band block padding */
  --maxw:1340px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
html,body{overflow-x:clip}
body{
  background:var(--canvas);
  color:var(--ink);
  font-family:var(--sans);
  font-weight:400;
  line-height:1.5;
  letter-spacing:-0.01em;
  font-feature-settings:"ss01","cv01";
  -webkit-font-smoothing:antialiased;
}

/* faint paper grain */
body::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:1;opacity:.04;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode:multiply;
}

a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
::selection{background:var(--accent);color:var(--on-accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}

.wrap{max-width:var(--maxw);margin:0 auto;padding-left:var(--gutter);padding-right:var(--gutter)}
.nw{white-space:nowrap}

/* skip link — hidden until keyboard focus */
.skip{
  position:fixed;left:16px;top:-60px;z-index:100;
  font-family:var(--mono);font-size:13px;
  background:var(--accent);color:var(--on-accent);
  padding:10px 18px;border-radius:100px;transition:top .2s;
}
.skip:focus-visible{top:14px}

/* ---------- reading progress (scroll-driven, CSS only) ---------- */
.progress{
  position:fixed;inset:0 0 auto 0;height:2px;z-index:90;pointer-events:none;
  background:var(--accent);transform-origin:0 50%;scale:0 1;
}
@supports(animation-timeline:scroll()){
  @media(prefers-reduced-motion:no-preference){
    .progress{animation:progressGrow linear both;animation-timeline:scroll(root)}
  }
}
@keyframes progressGrow{to{scale:1 1}}

/* ---------- type primitives ---------- */
.mono{font-family:var(--mono);font-weight:430;letter-spacing:0;font-size:13px;text-transform:uppercase}
.eyebrow{font-family:var(--mono);font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.display{
  font-family:var(--sans);
  font-weight:var(--hw);
  line-height:.92;
  letter-spacing:-0.038em;
  text-wrap:balance;
}
.lead{font-size:clamp(17px,1.5vw,21px);line-height:1.5;color:var(--ink-soft);max-width:46ch;text-wrap:pretty}

/* accent ink mark */
.mark{
  position:relative;
  background-image:linear-gradient(transparent 60%,var(--accent) 60%,var(--accent) 92%,transparent 92%);
  -webkit-box-decoration-break:clone;box-decoration-break:clone;
  padding:0 .02em;
}
.accent{color:var(--accent)}

/* ---------- code/math spotlight background ---------- */
.codebg{
  position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden;
  font-family:var(--mono);
  -webkit-mask-image:radial-gradient(circle 230px at var(--mx,-999px) var(--my,-999px), #000 0%, rgba(0,0,0,.55) 46%, transparent 72%);
  mask-image:radial-gradient(circle 230px at var(--mx,-999px) var(--my,-999px), #000 0%, rgba(0,0,0,.55) 46%, transparent 72%);
  opacity:0;transition:opacity .5s ease;
}
.codebg.on{opacity:1}
.cb{
  position:absolute;white-space:nowrap;font-size:13px;letter-spacing:0;line-height:1;
  color:color-mix(in srgb,var(--ink) 50%,transparent);
  text-shadow:0 0 1px rgba(0,0,0,.4);
  animation-name:cbdrift;animation-timing-function:ease-in-out;animation-iteration-count:infinite;animation-direction:alternate;
}
.codebg:not(.on) .cb{animation-play-state:paused}
.cb--math{color:color-mix(in srgb,var(--accent) 78%,#fff);font-size:14px}
.cb--rs{color:color-mix(in srgb,var(--ink) 62%,transparent)}
.cb--go{color:color-mix(in srgb,var(--ink) 58%,transparent)}
@keyframes cbdrift{from{transform:translateY(calc(var(--drift,8px) * -.5))}to{transform:translateY(var(--drift,8px))}}
.spot{
  position:fixed;left:0;top:0;z-index:0;pointer-events:none;
  width:520px;height:520px;border-radius:50%;
  background:radial-gradient(circle, color-mix(in srgb,var(--accent) 16%,transparent) 0%, transparent 66%);
  opacity:0;transition:opacity .5s ease;mix-blend-mode:screen;
}
.spot.on{opacity:.9}
@media(prefers-reduced-motion:reduce){.cb{animation:none}}

/* ---------- nav ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:14px var(--gutter);
  backdrop-filter:saturate(1.15) blur(10px);
  -webkit-backdrop-filter:saturate(1.15) blur(10px);
  background:linear-gradient(
    color-mix(in srgb,var(--canvas) 88%,transparent),
    color-mix(in srgb,var(--canvas) 62%,transparent));
  border-bottom:1px solid transparent;
  transition:border-color .3s;
}
.nav.stuck{border-color:var(--hairline)}
.nav__brand{display:flex;align-items:center;gap:10px;font-family:var(--mono);font-size:14px;letter-spacing:.02em;white-space:nowrap;flex-shrink:0;padding-block:6px}
.nav__dot{width:9px;height:9px;border-radius:50%;background:var(--accent);display:inline-block;flex-shrink:0}
.nav__links{display:flex;gap:clamp(14px,2.4vw,28px);align-items:center}
.nav__links a{font-family:var(--mono);font-size:13px;letter-spacing:.02em;color:var(--ink-soft);transition:color .2s;padding:10px 2px}
.nav__links a:hover{color:var(--ink)}
.nav__links a.nav__cta{
  font-family:var(--mono);font-size:13px;padding:9px 16px;border:1px solid var(--ink);border-radius:100px;white-space:nowrap;
  transition:background .2s,color .2s;color:var(--ink);
}
.nav__links a.nav__cta:hover{background:var(--ink);color:var(--canvas)}

/* ---------- section scaffold ---------- */
main{position:relative}
section{position:relative;z-index:2}
section[id], #top{scroll-margin-top:84px}
.sec-head{display:flex;align-items:baseline;gap:18px;margin-bottom:clamp(28px,4vw,56px)}
.sec-num{font-family:var(--mono);font-size:13px;color:var(--muted);font-weight:500}
.sec-num b{color:var(--ink)}
.sec-title{font-family:var(--mono);font-size:13px;font-weight:430;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}

/* ---------- HERO ---------- */
.hero{padding-block:clamp(36px,5.5vw,80px) 0}
.hero__eyebrow{display:flex;align-items:center;gap:14px;margin-bottom:clamp(22px,3vw,34px);flex-wrap:wrap}
.hero__eyebrow .eyebrow{white-space:nowrap}
.hero__eyebrow .tag{font-family:var(--mono);font-size:12.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink);border:1px solid var(--hairline);padding:6px 11px;border-radius:100px;white-space:nowrap}
.hero__loc{margin-left:auto}
.hero h1{font-size:clamp(44px,7.8vw,116px);margin:0}
.hero__bottom{
  display:grid;grid-template-columns:1.15fr .85fr;
  gap:clamp(24px,5vw,72px);align-items:center;
  margin-top:clamp(28px,4vw,48px);
}
.hero__meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.chip{font-family:var(--mono);font-size:12.5px;color:var(--ink-soft);border:1px solid var(--hairline);background:var(--canvas-2);padding:7px 13px;border-radius:100px}
.chip b{color:var(--ink);font-weight:500}

.hero__figwrap{position:relative;display:flex;justify-content:center;align-items:center;min-height:clamp(220px,24vw,340px)}
.hero__anchor{
  position:absolute;right:28%;top:21%;translate:0 -50%;z-index:0;
  font-family:var(--sans);font-weight:760;line-height:.8;
  font-size:clamp(96px,17vw,230px);letter-spacing:-0.05em;
  color:transparent;-webkit-text-stroke:2px var(--hairline);
  user-select:none;pointer-events:none;white-space:nowrap;
}
.hero__anchor .fill{color:var(--ink);-webkit-text-stroke:0}

/* scroll-scrubbed headline weight (progressive enhancement) */
@supports(animation-timeline:scroll()){
  @media(prefers-reduced-motion:no-preference){
    .hero h1{animation:heroWeight linear both;animation-timeline:scroll(root);animation-range:0 80vh}
  }
}
@keyframes heroWeight{
  from{font-variation-settings:'wght' 660}
  to{font-variation-settings:'wght' 400}
}

/* circular avatar (personal brand portrait) */
.avatar{
  position:relative;z-index:2;width:clamp(180px,18vw,260px);aspect-ratio:1;
  border-radius:50%;overflow:hidden;will-change:transform;
  background:#fff;
  box-shadow:0 34px 64px -32px rgba(0,0,0,.45);
  isolation:isolate;
}
.avatar img{width:100%;height:100%;object-fit:cover;object-position:50% 24%;display:block}
.avatar::after{
  content:"";position:absolute;inset:0;border-radius:50%;pointer-events:none;
  border:1px solid color-mix(in srgb,var(--ink) 16%,transparent);
}
.avatar::before{
  content:"";position:absolute;inset:-10px;border-radius:50%;pointer-events:none;z-index:-1;
  border:2px solid var(--accent);
  clip-path:polygon(50% 0,100% 0,100% 100%,50% 100%);
}

/* ---------- TICKER ---------- */
.ticker{
  position:relative;z-index:2;overflow:hidden;
  border-block:1px solid var(--hairline);
  margin-top:clamp(44px,6.5vw,92px);
  background:var(--canvas);
}
.ticker__track{display:flex;width:max-content}
.ticker__group{display:flex;align-items:center;flex-shrink:0}
.tk{
  font-family:var(--mono);font-size:12.5px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--ink-soft);white-space:nowrap;padding:15px clamp(18px,2vw,30px);
}
.tk-dot{width:6px;height:6px;border-radius:50%;background:var(--accent);flex-shrink:0}
@media(prefers-reduced-motion:no-preference){
  .ticker__track{animation:tickerScroll 48s linear infinite}
  .ticker:hover .ticker__track{animation-play-state:paused}
}
@keyframes tickerScroll{to{transform:translateX(-50%)}}

/* ---------- STATS BAND ---------- */
.stats{background:var(--canvas-2);color:var(--ink);padding-block:var(--by);border-bottom:1px solid var(--hairline)}
.stats .eyebrow{color:var(--muted)}
.stats__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:clamp(20px,3vw,40px);margin-top:30px}
.stat__num{font-family:var(--sans);font-weight:720;font-size:clamp(54px,8vw,128px);line-height:.86;letter-spacing:-0.05em;font-variant-numeric:tabular-nums}
.stat__num .u{color:var(--accent)}
.stat__label{font-family:var(--mono);font-size:12.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-top:14px;max-width:18ch}
.stat{border-top:1px solid var(--hairline);padding-top:18px}

/* ---------- cursor-glow cards (Linear-style, pointer only) ---------- */
.glow{position:relative}
.glow::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:0;transition:opacity .35s;
  background:radial-gradient(220px circle at var(--gx,50%) var(--gy,50%),
    color-mix(in srgb,var(--accent) 9%,transparent), transparent 70%);
}
@media(hover:hover) and (pointer:fine){
  .glow:hover::after{opacity:1}
}

/* ---------- WHAT I DO ---------- */
.do{padding-block:var(--sy)}
.do__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--hairline);border:1px solid var(--hairline)}
.do__card{background:var(--canvas);padding:clamp(26px,2.6vw,40px);min-height:clamp(260px,24vw,340px);display:flex;flex-direction:column;position:relative;transition:background .25s}
.do__card:hover{background:var(--canvas-2)}
.do__idx{font-family:var(--mono);font-size:13px;color:var(--muted)}
.do__big{font-family:var(--sans);font-weight:720;font-size:clamp(44px,4.8vw,72px);letter-spacing:-0.04em;line-height:.95;margin:auto 0 18px;padding-top:18px}
.do__card h3{font-family:var(--mono);font-size:13px;letter-spacing:.1em;text-transform:uppercase;margin-bottom:12px}
.do__card p{font-size:15.5px;line-height:1.5;color:var(--ink-soft);max-width:34ch}
.do__card .dash{width:34px;height:3px;background:var(--accent);margin-bottom:20px}

/* ---------- SELECTED WORK ---------- */
.work{padding-block:calc(var(--sy)*.3) var(--sy)}
.work__item{display:grid;grid-template-columns:.9fr 1.4fr;gap:clamp(24px,4vw,60px);align-items:center;padding:clamp(34px,5vw,64px) 0;border-top:1px solid var(--hairline)}
.work__no{font-family:var(--sans);font-weight:740;font-size:clamp(56px,9vw,150px);line-height:.8;letter-spacing:-0.05em;color:var(--ink)}
.work__meta{display:flex;flex-direction:column;gap:14px}
.work__tagrow{display:flex;flex-wrap:wrap;gap:8px}
.work__item h3{font-family:var(--sans);font-weight:640;font-size:clamp(26px,2.8vw,40px);letter-spacing:-0.03em;line-height:1.02}
.work__item p{font-size:16px;color:var(--ink-soft);max-width:40ch;line-height:1.5}
.work__link{font-family:var(--mono);font-size:13px;display:inline-flex;align-items:center;gap:8px;color:var(--ink);width:max-content;padding-block:8px;margin-block:-4px}
.work__link .arrow{transition:transform .25s}
.work__item:hover .work__link .arrow{transform:translateX(5px)}
/* branded visual block (swap for a real 16:10 product shot when ready) */
.ph{
  position:relative;aspect-ratio:16/10;border:1px solid var(--hairline);overflow:hidden;
  background:
    repeating-linear-gradient(135deg,var(--canvas-2) 0 14px,transparent 14px 28px),
    var(--canvas);
  display:flex;align-items:flex-end;padding:14px;
}
.ph::before{content:attr(data-label);font-family:var(--mono);font-size:11.5px;color:var(--ink-soft);letter-spacing:.06em;text-transform:uppercase}
.ph .ph__no{position:absolute;top:10px;right:14px;font-family:var(--mono);font-size:11.5px;color:var(--ink-soft)}

/* featured (single large project) */
.work__item--feat .work__body{display:grid;grid-template-columns:1.5fr 1fr;gap:clamp(22px,3.4vw,48px);align-items:center}
.work__item--feat .ph{aspect-ratio:16/10;cursor:pointer;transition:border-color .25s}
.work__item--feat .ph:hover{border-color:var(--accent)}
.ph__brand{position:absolute;left:18px;top:50%;transform:translateY(-50%);font-family:var(--sans);font-weight:720;font-size:clamp(40px,7vw,86px);letter-spacing:-0.04em;color:var(--ink);line-height:.9}
.ph__brand::after{content:"";display:inline-block;width:.28em;height:.28em;border-radius:50%;background:var(--accent);margin-left:.12em;vertical-align:.04em}
.work__item--feat h3{font-size:clamp(34px,4vw,58px)}

/* ---- work index (editorial list, hover dims siblings) ---- */
.windex{margin-top:clamp(8px,1.5vw,20px);display:flex;flex-direction:column}
.windex__row{
  display:grid;grid-template-columns:56px minmax(0,1fr) auto 28px;
  gap:clamp(14px,2.4vw,32px);align-items:center;
  padding:clamp(22px,3.2vw,36px) 0;
  border-top:1px solid var(--hairline);
  transition:opacity .3s,padding-left .3s;
}
.windex__row:last-child{border-bottom:1px solid var(--hairline)}
.windex__no{font-family:var(--mono);font-size:12.5px;color:var(--muted)}
.windex__main{display:flex;flex-direction:column;gap:8px;min-width:0}
.windex__name{
  font-family:var(--sans);font-weight:640;letter-spacing:-0.03em;line-height:1;
  font-size:clamp(28px,3.6vw,52px);
  transition:color .25s;
}
.windex__desc{font-size:14.5px;line-height:1.5;color:var(--muted);max-width:54ch;transition:color .25s}
.windex__tags{font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);text-align:right;white-space:nowrap}
.windex__arrow{font-size:20px;color:var(--accent);opacity:0;translate:-8px 0;transition:opacity .3s,translate .3s}
@media(hover:hover) and (pointer:fine){
  .windex:hover .windex__row{opacity:.38}
  .windex:hover .windex__row:hover{opacity:1;padding-left:10px}
  .windex__row:hover .windex__arrow{opacity:1;translate:0 0}
  .windex__row:hover .windex__desc{color:var(--ink-soft)}
}
.work__note{margin-top:clamp(20px,3vw,32px);font-family:var(--mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}

/* floating preview tile that follows the cursor */
.wpreview{
  position:fixed;left:0;top:0;z-index:40;pointer-events:none;
  width:min(320px,28vw);aspect-ratio:16/10;
  display:none;flex-direction:column;justify-content:center;align-items:flex-start;gap:6px;
  padding:22px;
  background:
    repeating-linear-gradient(135deg,color-mix(in srgb,var(--canvas-2) 70%,var(--canvas)) 0 12px,transparent 12px 24px),
    var(--canvas-2);
  border:1px solid var(--hairline);
  opacity:0;scale:.94;
  transition:opacity .25s,scale .25s;
  will-change:transform;
}
.wpreview.on{opacity:1;scale:1}
.wpreview__no{font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:var(--muted);text-transform:uppercase}
.wpreview__brand{font-family:var(--sans);font-weight:720;font-size:clamp(28px,2.6vw,40px);letter-spacing:-0.035em;line-height:1;color:var(--ink)}
.wpreview__brand::after{content:"";display:inline-block;width:.26em;height:.26em;border-radius:50%;background:var(--accent);margin-left:.14em}
.wpreview__label{font-family:var(--mono);font-size:11.5px;letter-spacing:.06em;color:var(--muted);text-transform:uppercase}
@media(hover:hover) and (pointer:fine){
  .wpreview{display:flex}
}

/* ---------- TEACHING ---------- */
.teach{padding-block:var(--by);background:var(--canvas-2);border-block:1px solid var(--hairline)}
.teach__grid{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(28px,5vw,70px);align-items:center}
.teach__lead h3{font-family:var(--sans);font-weight:var(--hw);font-size:clamp(36px,5.2vw,68px);letter-spacing:-0.035em;line-height:.98;margin-bottom:22px;text-wrap:balance}
.teach__lead p{font-size:17px;color:var(--ink-soft);max-width:42ch;line-height:1.55;margin-bottom:26px}
.teach__stat{display:flex;align-items:baseline;gap:14px;margin-bottom:8px}
.teach__stat b{font-family:var(--sans);font-weight:740;font-size:clamp(40px,5vw,72px);letter-spacing:-0.04em;line-height:1;font-variant-numeric:tabular-nums}
.teach__cap{font-family:var(--mono);font-size:13px;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}
.teach__links{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.teach__links a{
  font-family:var(--mono);font-size:12.5px;padding:10px 16px;border:1px solid var(--hairline);
  border-radius:100px;transition:border-color .2s,color .2s,background .2s;color:var(--ink-soft);
}
.teach__links a:hover{border-color:var(--ink);color:var(--ink)}
/* book card */
.book{background:var(--canvas);border:1px solid var(--hairline);padding:clamp(22px,2.4vw,34px);display:flex;flex-direction:column;gap:20px}
.book__cover{
  display:block;border:1px solid var(--ink);position:relative;overflow:hidden;line-height:0;
  box-shadow:0 18px 40px -22px rgba(0,0,0,.55);transition:transform .3s ease,box-shadow .3s ease;
}
.book__cover img{width:100%;height:auto;display:block}
.book__cover:hover{transform:translateY(-4px);box-shadow:0 26px 50px -24px rgba(0,0,0,.6)}
.book__row{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px}
.book__row h3{font-family:var(--sans);font-weight:600;font-size:19px;letter-spacing:-0.02em}
.book__row p{font-family:var(--mono);font-size:12px;color:var(--muted);margin-top:4px}
.btn-accent{
  font-family:var(--mono);font-size:13px;background:var(--accent);color:var(--on-accent);
  padding:12px 18px;border-radius:100px;display:inline-flex;align-items:center;gap:9px;
  white-space:nowrap;transition:transform .2s,box-shadow .2s;border:1px solid var(--on-accent);
}
.btn-accent:hover{transform:translateY(-2px);box-shadow:0 8px 0 -2px var(--on-accent)}

/* ---------- STACK ---------- */
.stack{padding-block:var(--sy)}
.stack__grid{display:grid;grid-template-columns:1fr 1.3fr;gap:clamp(28px,5vw,70px);align-items:start}
.stack__core{display:flex;flex-direction:column}
.stack__row{display:flex;align-items:center;gap:18px;padding:18px 0;border-top:1px solid var(--hairline);transition:padding-left .25s}
.stack__row:last-child{border-bottom:1px solid var(--hairline)}
.stack__row .n{font-family:var(--mono);font-size:12px;color:var(--muted);width:34px;flex-shrink:0}
.stack__row .nm{font-family:var(--sans);font-weight:600;font-size:clamp(22px,2.4vw,34px);letter-spacing:-0.025em}
.stack__row .d{margin-left:auto;font-family:var(--mono);font-size:12.5px;color:var(--muted);text-align:right;max-width:22ch}
.stack__core .stack__row:hover{padding-left:8px}
.stack__row--ai{border-top-color:var(--ink)}
.stack__row--ai .d{color:var(--ink)}
.stack__range h3{font-family:var(--mono);font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:20px}
.stack__chips{display:flex;flex-wrap:wrap;gap:10px}
.stack__chips .chip{font-size:14px;padding:10px 16px}
.stack__note{margin-top:26px;font-size:15px;color:var(--ink-soft);max-width:40ch;line-height:1.55}

/* ---------- CONTACT ---------- */
.contact{background:var(--canvas-2);color:var(--ink);padding-block:clamp(64px,9vw,136px);position:relative;overflow:hidden;border-top:1px solid var(--hairline)}
.contact__grid{display:grid;grid-template-columns:1.5fr .8fr;gap:clamp(30px,5vw,60px);align-items:center;position:relative;z-index:2}
.contact .eyebrow{color:var(--muted)}
.contact h2{font-family:var(--sans);font-weight:var(--hw);font-size:clamp(44px,9vw,128px);letter-spacing:-0.045em;line-height:.9;margin:18px 0 32px;text-wrap:balance}
.contact h2 .mark{background-image:linear-gradient(transparent 58%,var(--accent) 58%,var(--accent) 90%,transparent 90%)}
.contact__links{display:flex;flex-wrap:wrap;gap:12px}
.contact__links a{
  font-family:var(--mono);font-size:14px;padding:12px 20px;border:1px solid var(--hairline);
  border-radius:100px;display:inline-flex;align-items:center;gap:10px;transition:background .2s,color .2s,border-color .2s;
}
.contact__links a:hover{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}
.contact__links a.primary{background:var(--accent);color:var(--on-accent);border-color:var(--accent);font-weight:500}
.contact__figwrap{display:flex;justify-content:center;position:relative}
.contact__figwrap .avatar{width:clamp(190px,22vw,300px)}
.contact__figwrap .avatar::after{border-color:color-mix(in srgb,var(--canvas) 22%,transparent)}
.contact__big{position:absolute;left:-4%;bottom:-14%;font-family:var(--sans);font-weight:760;font-size:clamp(160px,26vw,380px);line-height:.8;color:transparent;-webkit-text-stroke:1.5px var(--hairline);z-index:0;pointer-events:none;user-select:none}

/* ---------- FOOTER ---------- */
.foot{padding:28px var(--gutter);display:flex;flex-wrap:wrap;gap:14px 28px;justify-content:space-between;align-items:center;font-family:var(--mono);font-size:12.5px;color:var(--muted)}
.foot a{padding-block:8px;display:inline-block}
.foot a:hover{color:var(--ink)}
.foot__nav{display:flex;gap:20px;flex-wrap:wrap}

/* ---------- reveal motion ---------- */
.reveal{opacity:0;transform:translateY(20px);transition:opacity .8s cubic-bezier(.2,.7,.2,1),transform .8s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
}

/* ============================================================
   BREAKPOINTS — 1100 / 860 / 640 / 400
   ============================================================ */

/* ---- TABLET (861–1100px) ---- */
@media(min-width:861px) and (max-width:1100px){
  .hero__bottom{grid-template-columns:1.1fr .9fr;gap:clamp(18px,3.5vw,44px)}
  .hero__figwrap{justify-content:flex-end}
  .hero__anchor{left:-2%;right:auto;font-size:clamp(96px,14vw,160px)}
  .do__grid{grid-template-columns:1fr 1fr}
  .do__card:last-child{grid-column:1/-1}
  .do__card:last-child p{max-width:52ch}
  .work__item--feat .work__body{grid-template-columns:1fr;gap:22px}
  .teach__grid{grid-template-columns:1fr .9fr;gap:clamp(24px,4vw,48px)}
  .stack__grid{grid-template-columns:1fr 1.15fr;gap:clamp(24px,4vw,52px)}
  .contact__grid{grid-template-columns:1.3fr .9fr}
}

/* ---- SMALL TABLET (≤860px): single-column stacks ---- */
@media(max-width:860px){
  .sec-head{margin-bottom:clamp(24px,5vw,40px)}
  .hero__bottom{grid-template-columns:1fr;gap:36px}
  .hero__figwrap{justify-content:flex-start;min-height:auto;padding-block:10px}
  .hero__anchor{right:4%;font-size:clamp(96px,20vw,180px)}
  .avatar{width:clamp(190px,32vw,260px)}
  .stats__grid{grid-template-columns:repeat(2,1fr);gap:32px 24px}
  .stat__num{font-size:clamp(56px,11vw,96px)}
  .do__grid{grid-template-columns:1fr 1fr}
  .do__card:last-child{grid-column:1/-1}
  .do__big{font-size:clamp(40px,6.5vw,60px)}
  .work__item{grid-template-columns:1fr;gap:18px}
  .work__item--feat .work__body{grid-template-columns:1fr;gap:20px}
  .windex__row{grid-template-columns:40px minmax(0,1fr) 28px;}
  .windex__tags{display:none}
  .teach__grid{grid-template-columns:1fr;gap:40px}
  .book{max-width:420px}
  .stack__grid{grid-template-columns:1fr;gap:44px}
  .contact__grid{grid-template-columns:1fr}
  .contact__figwrap{justify-content:flex-start;margin-top:10px}
}

/* ---- PHONE (≤640px) ---- */
@media(max-width:640px){
  .nav{padding:12px var(--gutter)}
  .nav__links{gap:12px}
  .nav__links a{font-size:12px;padding:10px 2px}
  .nav__links a[href="#teaching"], .nav__links a[href="#stack"]{display:none}
  .nav__links a.nav__cta{padding:8px 13px}
  .nav__cta-tail{display:none}

  .hero{padding-top:28px}
  .hero__eyebrow{gap:10px;margin-bottom:18px}
  .hero__loc{display:none}
  .hero__bottom{margin-top:24px;gap:28px}
  .hero__figwrap{justify-content:center;padding-block:6px}
  .hero__anchor{display:none}
  .avatar{width:min(56vw,230px)}
  .hero__meta{gap:8px;margin-top:22px}

  .ticker .tk{padding-block:13px}

  .stats__grid{gap:28px 20px}
  .stat__num{font-size:clamp(48px,15vw,84px)}

  .do__grid{grid-template-columns:1fr}
  .do__card{min-height:auto;padding:24px 22px}
  .do__card:last-child{grid-column:auto}
  .do__big{font-size:clamp(40px,11vw,56px);margin-top:8px}

  .work__no{font-size:clamp(48px,15vw,72px)}
  .ph__brand{font-size:clamp(36px,10vw,56px)}
  .windex__row{grid-template-columns:minmax(0,1fr) 24px;padding:22px 0}
  .windex__no{display:none}
  .windex__arrow{opacity:1;translate:0 0;color:var(--muted);font-size:17px}
  .windex__name{font-size:clamp(26px,7.5vw,34px)}
  .windex__desc{font-size:13.5px}

  .teach__lead h3{font-size:clamp(32px,8.5vw,44px)}
  .book{max-width:none}

  /* stack rows: name on top, role below — no cramped right column */
  .stack__row{flex-wrap:wrap;gap:4px 14px;padding:16px 0}
  .stack__row .nm{flex:1 1 auto}
  .stack__row .d{margin-left:0;flex:1 1 100%;text-align:left;max-width:none}

  .contact h2{margin:14px 0 28px}
  .contact__big{font-size:clamp(120px,36vw,170px);left:0;bottom:-8%}
  .contact__figwrap .avatar{width:min(48vw,200px)}
  /* full-width tap targets */
  .contact__links{gap:10px}
  .contact__links a{flex:1 1 calc(50% - 10px);justify-content:center;padding:14px 16px}
  .contact__links a.primary{flex-basis:100%}

  .foot{flex-direction:column;align-items:flex-start;gap:4px;padding:24px var(--gutter)}
  .foot__nav{gap:16px}
}

/* ---- SMALL PHONE (≤400px) ---- */
@media(max-width:400px){
  .hero__eyebrow .tag{font-size:11.5px;padding:5px 9px}
  .stats__grid{grid-template-columns:1fr;gap:24px}
  .contact__links a{flex-basis:100%}
  .chip{font-size:11.5px;padding:6px 11px}
  .book__row{flex-direction:column;align-items:flex-start;gap:12px}
}