/* =========================================================
   karpathy.ai — option A terminal · light + dark
   light bg: #EFEEE8 (warm cream)
   dark bg:  #202020 (classic terminal)
   pure html + css · zero js · two files
   ========================================================= */

:root{
  /* light mode — paper terminal */
  --bg:          #EFEEE8;
  --bg-2:        #E7E5DB;
  --bg-3:        #DDDACE;
  --ink:         #1a1a17;
  --ink-2:       #3a3833;
  --dim:         #7a7770;
  --line:        #cdcbc0;
  --line-2:      #b9b7ab;
  --accent:      #0f766e;       /* deep teal for cream */
  --link:        #2c5cc5;       /* fountain pen blue */
  --visited:     #7c3aed;
  --glow:        0 0 0 3px var(--bg), 0 0 10px rgba(15,118,110,.18);

  --mono: ui-monospace,"SF Mono","JetBrains Mono",Menlo,Consolas,monospace;
  --sans: -apple-system,BlinkMacSystemFont,"Inter","Helvetica Neue",Helvetica,Arial,sans-serif;
}

@media (prefers-color-scheme: dark){
  :root{
    /* dark mode — classic terminal */
    --bg:        #202020;
    --bg-2:      #262626;
    --bg-3:      #2f2f2f;
    --ink:       #e8e6e0;
    --ink-2:     #bdbbb4;
    --dim:       #7a7870;
    --line:      #303030;
    --line-2:    #3c3c3c;
    --accent:    #7ee3c1;        /* mint — option A original */
    --link:      #8cc2dd;        /* Karpathy Bear blog dark link */
    --visited:   #b9a4e6;
    --glow:      0 0 0 3px var(--bg), 0 0 12px rgba(126,227,193,.35);
  }
}

*{box-sizing:border-box}
html,body{
  margin:0;padding:0;
  background:var(--bg);color:var(--ink);
  font-family:var(--sans);font-size:16px;line-height:1.5;
  -webkit-font-smoothing:antialiased;
  font-feature-settings:"kern","liga";
}

a{
  color:var(--link);text-decoration:none;
  border-bottom:1px dotted color-mix(in oklab,var(--link) 50%,transparent);
}
a:hover{color:var(--accent);border-bottom-color:var(--accent)}
a:visited{color:var(--visited)}

.wrap{max-width:1000px;margin:0 auto;padding:48px 28px 120px}

/* ---------- terminal bar ---------- */
.term-bar{
  display:flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:11px;color:var(--dim);
  border:1px solid var(--line-2);border-radius:6px 6px 0 0;
  padding:8px 14px;background:var(--bg-3);
}
.term-bar .dots{display:flex;gap:6px}
.term-bar .dot{width:11px;height:11px;border-radius:50%;border:.5px solid rgba(0,0,0,.2)}
.term-bar .dot.r{background:#ff5f57}
.term-bar .dot.y{background:#febc2e}
.term-bar .dot.g{background:#28c840}
.term-bar .path{margin-left:6px}
.term-bar .stat{margin-left:auto;display:flex;gap:14px}
.term-bar .stat span::before{content:"●";color:var(--accent);margin-right:5px}

.term-body{
  border:1px solid var(--line-2);border-top:0;
  border-radius:0 0 6px 6px;
  padding:36px 36px 32px;
  background:var(--bg);
}

/* ---------- hero ---------- */
.hero{display:grid;grid-template-columns:160px 1fr;gap:32px;align-items:start}
.avatar{
  width:160px;height:160px;border-radius:50%;
  border:1px solid var(--line-2);
  box-shadow:var(--glow);
  display:block;background:var(--bg-2);
}
.name{
  font-size:34px;font-weight:700;letter-spacing:-.5px;
  margin:0 0 6px;color:var(--ink);line-height:1.05;
}
.name .blink{
  display:inline-block;width:10px;height:24px;
  background:var(--accent);margin-left:4px;vertical-align:-3px;
  animation:blink 1s steps(2) infinite;
}
@keyframes blink{50%{opacity:0}}

.tag{
  font-size:18px;color:var(--ink-2);
  margin:0 0 16px;line-height:1.4;
}
.tag em{color:var(--accent);font-style:normal;font-weight:500}

.links{display:flex;flex-wrap:wrap;gap:6px;font-family:var(--mono);font-size:12px}
.links a{
  display:inline-flex;align-items:center;gap:6px;
  border:1px solid var(--line-2);border-radius:3px;
  padding:5px 10px;color:var(--ink-2);background:var(--bg);
}
.links a:hover{border-color:var(--accent);color:var(--accent);background:var(--bg-2)}
.links a img,
.links a svg{
  width:13px;height:13px;display:block;
  opacity:.75;
}
.links a:hover img,
.links a:hover svg{opacity:1}
@media (prefers-color-scheme: dark){
  .links a img{filter:invert(1)}
}

/* ---------- loss function (realizing Karpathy's own HTML comment idea) ---------- */
.loss{
  margin:28px 0 0;padding:0;
  color:var(--accent);
}
.loss svg{
  display:block;width:100%;height:auto;
  max-height:120px;
  overflow:visible;
}

/* axes + grid */
.loss .axis{
  stroke:var(--line-2);stroke-width:1;fill:none;
}
.loss .grid{
  stroke:var(--line);stroke-width:.5;stroke-dasharray:2 3;fill:none;
}

/* axis labels */
.loss text{
  font-family:var(--mono);font-size:8px;
  fill:var(--dim);text-transform:lowercase;letter-spacing:.04em;
}

/* the curve: drawn from left to right on load (pure CSS animation) */
.loss .curve{
  stroke-dasharray:700;
  stroke-dashoffset:700;
  animation:loss-draw 3.2s cubic-bezier(.25,.46,.45,.94) .35s forwards;
}
@keyframes loss-draw{
  to{stroke-dashoffset:0}
}

/* the filled area fades in as the curve finishes drawing */
.loss .area{
  opacity:0;
  animation:loss-fade 1.4s ease-out 2.8s forwards;
}
@keyframes loss-fade{
  to{opacity:1}
}

/* axis labels fade in after the curve settles */
.loss text{
  opacity:0;
  animation:loss-fade 1s ease-out 3.2s forwards;
}

/* respect reduced-motion preference — show the final state immediately */
@media (prefers-reduced-motion: reduce){
  .loss .curve{animation:none;stroke-dashoffset:0}
  .loss .area{animation:none;opacity:1}
  .loss text{animation:none;opacity:1}
}

/* ---------- sections ---------- */
h2.section{
  font-family:var(--mono);font-size:11px;
  text-transform:uppercase;letter-spacing:.18em;
  color:var(--accent);margin:48px 0 14px;
  display:flex;align-items:center;gap:10px;font-weight:600;
}
h2.section::before{content:">";color:var(--accent)}
h2.section::after{content:"";flex:1;border-bottom:1px dashed var(--line);margin-left:6px}

/* ---------- timeline ---------- */
.timeline{position:relative;padding-left:140px}
.timeline::before{
  content:"";position:absolute;
  left:118px;top:10px;bottom:0;
  border-left:1px dashed var(--line);
}
.row{position:relative;padding:0 0 28px}
.row .when{
  position:absolute;left:-140px;width:104px;text-align:right;
  font-family:var(--mono);font-size:14px;color:var(--dim);padding-top:4px;
}
.row .dot{
  position:absolute;left:-28px;top:14px;width:10px;height:10px;
  border-radius:50%;background:var(--bg);border:2px solid var(--accent);
  box-shadow:var(--glow);
}
.row .head{
  display:flex;align-items:center;gap:14px;margin-bottom:8px;
}
.row .logo{
  width:42px;height:42px;flex-shrink:0;
  object-fit:contain;border-radius:6px;
  background:var(--bg-2);border:1px solid var(--line);
  padding:5px;
}
.row .what{font-weight:600;color:var(--ink);font-size:18px;margin:0}
.row .what .org{color:var(--accent)}
.row p{margin:0;color:var(--ink-2);font-size:17px;line-height:1.55}

/* ---------- projects ---------- */
.projects{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.proj{
  border:1px solid var(--line);border-radius:4px;
  padding:14px 16px;background:var(--bg-2);
  transition:.15s border-color,.15s transform;
}
.proj:hover{border-color:var(--accent);transform:translateY(-1px)}
.proj h3{
  margin:0 0 4px;font-size:14px;
  font-family:var(--mono);color:var(--accent);
}
.proj p{margin:0;font-size:13px;color:var(--ink-2)}

/* ---------- publications ---------- */
.pubs{display:grid;grid-template-columns:1fr;gap:0}
.pub{
  display:grid;grid-template-columns:60px 1fr 110px;gap:18px;
  padding:14px 0;border-bottom:1px dashed var(--line);
}
.pub:last-child{border-bottom:0}
.pub .yr{font-family:var(--mono);font-size:14px;color:var(--dim);padding-top:2px}
.pub .ti{color:var(--ink);font-size:15px;line-height:1.45}
.pub .ti a{color:var(--ink);border:0}
.pub .ti a:hover{color:var(--accent)}
.pub .vn{
  font-family:var(--mono);font-size:12px;color:var(--accent);
  text-align:right;text-transform:lowercase;letter-spacing:.04em;
  padding-top:3px;
}

/* ---------- bio paragraph ---------- */
.bio{
  margin:0;font-size:17px;line-height:1.55;color:var(--ink-2);
}

/* ---------- sub-list inside timeline rows ---------- */
.row .sub-list{
  margin:8px 0 12px 0;padding-left:22px;
  font-size:16px;line-height:1.55;color:var(--ink-2);
}
.row .sub-list li{margin-bottom:5px}
.row p + p{margin-top:10px}
.row p strong{color:var(--ink);font-weight:600}

/* ---------- teaching sub-list (horizontal, centered, like Karpathy's site) ---------- */
.teaching .sub-list{
  list-style:none;
  padding:0;margin:18px 0;
  display:flex;flex-wrap:wrap;justify-content:center;gap:0;
  font-size:16px;
}
.teaching .sub-list li{
  margin:0;padding:0 20px;
  border-right:1px solid var(--line-2);
  line-height:1.4;
}
.teaching .sub-list li:last-child{border-right:0}

/* ---------- featured talks (card grid) ---------- */
.talks{
  display:grid;
  grid-template-columns:repeat(auto-fill, minmax(150px, 1fr));
  gap:14px;
}
.talks .card{
  display:flex;flex-direction:column;
  border:1px solid var(--line);border-radius:4px;
  background:var(--bg-2);overflow:hidden;
  transition:.15s border-color,.15s transform;
}
.talks .card:hover{border-color:var(--accent);transform:translateY(-1px)}
.talks .card > a{
  display:flex;flex-direction:column;flex:1;
  text-decoration:none;border:0;color:var(--ink-2);
}
.talks .card img{
  display:block;width:100%;aspect-ratio:16/9;
  object-fit:cover;background:var(--bg-3);
}
.talks .card span{
  display:block;padding:10px 12px;
  font-family:var(--mono);font-size:11px;color:var(--ink-2);
  line-height:1.4;flex:1;
}
.talks .card:hover span{color:var(--accent)}
.talks .card-extra{
  display:block;padding:0 12px 10px;
  font-family:var(--mono);font-size:10px;
  color:var(--accent);border:0;
  text-transform:lowercase;letter-spacing:.06em;
}
.talks .card-extra:hover{text-decoration:underline}

/* ---------- teaching ---------- */
.teaching{font-size:17px;line-height:1.55;color:var(--ink-2)}
.teaching p{margin:0 0 14px}
.teaching img{
  display:block;max-width:100%;
  border-radius:4px;margin:14px 0 18px;
  border:1px solid var(--line);
}

/* ---------- featured writing ---------- */
.writing-intro{
  margin:0 0 18px;font-size:17px;line-height:1.55;
  color:var(--ink-2);
}
.writing{
  list-style:none;padding:0;margin:0;
}
.writing li{
  display:grid;grid-template-columns:100px 1fr 70px;gap:18px;
  padding:10px 0;border-bottom:1px dashed var(--line);
  align-items:baseline;
}
.writing li:last-child{border-bottom:0}
.writing time{
  color:var(--dim);font-family:var(--mono);font-size:13px;
  text-transform:uppercase;letter-spacing:.06em;
}
.writing a{color:var(--ink);border:0;font-size:16px}
.writing a:hover{color:var(--accent)}
.writing .src{
  font-family:var(--mono);font-size:12px;color:var(--accent);
  text-align:right;text-transform:lowercase;letter-spacing:.04em;
}

/* ---------- pet projects note + project p ---------- */
.projects-note{
  margin:0 0 16px;font-family:var(--mono);font-size:13px;
  color:var(--accent);
}
.proj p{font-size:16px;color:var(--ink-2);line-height:1.55}
.proj p a{color:var(--accent);border:0}
.proj p a:hover{text-decoration:underline}

/* override: projects are a single column with more breathing room for long descriptions */
.projects{grid-template-columns:1fr;gap:0}
.proj{
  border:0;border-bottom:1px dashed var(--line);
  border-radius:0;background:transparent;
  padding:18px 0;
}
.proj:hover{transform:none;border-color:transparent;border-bottom-color:var(--accent)}
.proj:last-child{border-bottom:0}
.proj h3{margin:0 0 8px;font-size:16px}

/* ---------- publications (override for au inline under ti) ---------- */
.pub{align-items:start}
.pub .ti{display:block}
.pub .ti a{display:block;margin-bottom:4px}
.pub .au{
  display:block;font-size:13px;color:var(--dim);
  font-style:italic;font-family:var(--sans);
}
.pub .vn{align-self:start}

.scholar{
  margin:20px 0 0;font-size:15px;color:var(--dim);
}
.scholar a{color:var(--accent);border:0}

/* ---------- misc unsorted ---------- */
.misc{
  list-style:none;padding:0;margin:0;
  font-size:16px;line-height:1.6;color:var(--ink-2);
}
.misc li{
  padding-left:22px;position:relative;margin-bottom:10px;
}
.misc li::before{
  content:"·";position:absolute;left:6px;top:-4px;
  color:var(--accent);font-size:22px;font-family:var(--mono);
}

/* ---------- email reveal ---------- */
#demail{
  font-family:var(--mono);font-size:14px;color:var(--ink);
  margin-top:14px;line-height:1.55;padding:12px 14px;
  border:1px dashed var(--accent);border-radius:3px;
  background:var(--bg-2);
}
#demail:empty{display:none;margin:0;padding:0;border:0}

/* ---------- footer ---------- */
footer{
  margin-top:60px;padding-top:18px;
  border-top:1px dashed var(--line);
  font-family:var(--mono);font-size:11px;color:var(--dim);
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;
}
footer .lhs span{color:var(--accent)}

/* ---------- mobile ---------- */
@media (max-width:640px){
  .wrap{padding:24px 14px 80px}
  .term-body{padding:22px 18px}
  .hero{grid-template-columns:100px 1fr;gap:18px}
  .avatar{width:100px;height:100px}
  .name{font-size:24px}
  .timeline{padding-left:14px}
  .timeline::before{left:0}
  .row .when{position:static;text-align:left;display:block;margin-bottom:4px;width:auto}
  .row .dot{left:-19px}
  .pub{grid-template-columns:1fr;gap:2px}
  .pub .vn{text-align:left}
  .projects{grid-template-columns:1fr}
  .talks{grid-template-columns:repeat(2,1fr);gap:10px}
  .talks .card span{font-size:10px;padding:8px 10px}
  .writing li{grid-template-columns:1fr;gap:4px}
  .writing time{padding-top:0}
  .writing .src{justify-self:start;text-align:left}
}