/* home.css — modern AI leader portfolio
   Dark by default. Monochrome with a single warm-white "accent" carried by
   weight + scale, not color. Geist throughout. Wide, generous, technical. */

/* ── Reset + base ──────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Geist", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss03", "cv11", "cv05";
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  transition: background .25s ease, color .25s ease;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }

/* ── Theme variables ──────────────────────────────────────────────────── */
:root, [data-theme="dark"] {
  --bg:        #08080a;
  --bg-2:      #0f0f12;
  --bg-3:      #18181c;
  --ink:       #f0efe9;
  --ink-2:     #ffffff;
  --soft:      #a5a59e;
  --muted:     #5e5e58;
  --rule:      #232328;
  --rule-2:    #1a1a1e;
  --accent:    #f0efe9;   /* monochrome — accent is just brighter ink */
  --accent-d:  #ffffff;
  --warn:      #d97758;   /* used very sparingly */
  --pop:       #5a90d6;   /* instrument-blue accent, small touches only */
}
[data-theme="light"] {
  --bg:        #f9f8f4;
  --bg-2:      #f0eee6;
  --bg-3:      #e7e4d8;
  --ink:       #0a0a08;
  --ink-2:     #000000;
  --soft:      #4a4a44;
  --muted:     #898980;
  --rule:      #d8d4c4;
  --rule-2:    #e5e2d3;
  --accent:    #0a0a08;
  --accent-d:  #000000;
  --warn:      #b8351a;
  --pop:       #2f6fc2;
}

/* ── Mono helper ──────────────────────────────────────────────────────── */
.mono {
  font-family: "Geist Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-feature-settings: "tnum", "zero", "ss03";
}
.pop { color: var(--pop); }

/* ── Top nav ──────────────────────────────────────────────────────────── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding: 18px 32px;
  display: flex; justify-content: space-between; align-items: center;
  background: color-mix(in oklab, var(--bg), transparent 25%);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  border-bottom: 1px solid var(--rule-2);
}
.nav .mark {
  font-weight: 600;
  font-size: 14px;
  letter-spacing: -0.01em;
  display: flex; align-items: center; gap: 10px;
}
.nav .mark .glyph {
  width: 22px; height: 22px;
  display: grid; place-items: center;
  border: 1px solid var(--rule);
  font-family: "Geist Mono", monospace;
  font-size: 11px;
  font-weight: 500;
  color: var(--soft);
}
.nav-links {
  display: flex; align-items: center; gap: 4px;
  font-family: "Geist Mono", monospace;
  font-size: 12px;
}
.nav-links a {
  padding: 7px 11px;
  color: var(--soft);
  letter-spacing: -0.005em;
  transition: color .15s;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.ext::after {
  content: " ↗"; opacity: 0.5;
}
.nav .theme-toggle {
  margin-left: 12px;
  width: 32px; height: 32px;
  display: grid; place-items: center;
  background: transparent; border: 1px solid var(--rule);
  color: var(--soft); cursor: pointer;
  transition: color .15s, border-color .15s, background .15s;
}
.nav .theme-toggle:hover {
  color: var(--ink); border-color: var(--soft);
}
.nav .theme-toggle svg { width: 14px; height: 14px; }

/* ── Layout: full-bleed sections with consistent container ────────────── */
.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 32px;
}
section { padding: 120px 0; position: relative; }
section:first-of-type { padding-top: 0; }

/* Section label (small caps overline) */
.kicker {
  font-family: "Geist Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 24px;
}
.kicker::before {
  content: ""; width: 24px; height: 1px;
  background: var(--pop);
}

h2.section-title {
  font-size: clamp(34px, 4.4vw, 52px);
  font-weight: 500;
  line-height: 1.04;
  letter-spacing: -0.025em;
  margin: 0 0 18px;
  max-width: 24ch;
  text-wrap: balance;
}
.section-lede {
  font-size: 17px;
  line-height: 1.55;
  color: var(--soft);
  max-width: 62ch;
  margin: 0 0 56px;
  text-wrap: pretty;
}

/* ── Hero ─────────────────────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  padding-top: 140px;
  padding-bottom: 80px;
  display: flex; flex-direction: column; justify-content: space-between;
  position: relative;
}
.hero .container { flex: 1; display: flex; flex-direction: column; justify-content: center; gap: 64px; }

.hero-tag {
  font-family: "Geist Mono", monospace;
  font-size: 12px;
  color: var(--soft);
  letter-spacing: -0.005em;
  display: inline-flex; align-items: center; gap: 10px;
  white-space: nowrap;
}
.hero-tag .live {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--warn);
  display: inline-block;
  box-shadow: 0 0 8px var(--warn);
  animation: livePulse 2.4s ease-in-out infinite;
}
@keyframes livePulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero h1 {
  font-size: clamp(48px, 7.5vw, 104px);
  font-weight: 500;
  line-height: 0.98;
  letter-spacing: -0.04em;
  margin: 24px 0 0;
  max-width: 18ch;
  text-wrap: balance;
}
.hero h1 .dim {
  color: var(--soft);
}
.hero-sub {
  margin-top: 32px;
  font-size: 19px;
  line-height: 1.5;
  color: var(--soft);
  max-width: 56ch;
  text-wrap: pretty;
}
.hero-sub strong { color: var(--ink); font-weight: 500; }

/* Current-focus line — folded into the hero */
.hero-focus {
  display: flex;
  gap: 16px;
  align-items: baseline;
  margin-top: 30px;
  max-width: 66ch;
}
.hero-focus .k {
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
  flex-shrink: 0;
  padding-top: 2px;
}
.hero-focus .v {
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--soft);
  text-wrap: pretty;
}

/* Metrics bar — bottom of hero */
.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.metric {
  padding: 28px 24px;
  border-right: 1px solid var(--rule-2);
  display: flex; flex-direction: column; gap: 8px;
}
.metric:last-child { border-right: none; }
.metric:nth-child(3n) { border-right: none; }
.metric .label {
  font-family: "Geist Mono", monospace;
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
.metric .value {
  font-size: 32px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
  font-feature-settings: "tnum";
}
.metric .value .unit {
  font-size: 16px;
  color: var(--pop);
  font-weight: 400;
  letter-spacing: -0.005em;
  margin-left: 4px;
}

/* ── Now-working-on band ──────────────────────────────────────────────── */
.now {
  padding: 80px 0;
  border-bottom: 1px solid var(--rule);
}
.now-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 48px;
  align-items: start;
}
.now-grid .label {
  font-family: "Geist Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  padding-top: 8px;
}
.now-grid .body {
  font-size: 19px;
  line-height: 1.55;
  color: var(--soft);
  max-width: 64ch;
  text-wrap: pretty;
}
.now-grid .body strong { color: var(--ink); font-weight: 500; }
.now-grid .body em {
  font-style: normal;
  color: var(--ink);
  font-weight: 500;
}

/* ── Projects (case study cards with diagrams) ────────────────────────── */
.projects {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.project {
  border: 1px solid var(--rule);
  background: var(--bg-2);
  padding: 0;
  display: flex; flex-direction: column;
  transition: border-color .2s, transform .2s;
  overflow: hidden;
}
.project:hover {
  border-color: color-mix(in oklab, var(--pop), transparent 35%);
  transform: translateY(-3px);
}
.project-diagram {
  height: 220px;
  background: var(--bg-3);
  border-bottom: 1px solid var(--rule);
  display: grid; place-items: center;
  padding: 24px;
  position: relative;
  overflow: hidden;
}
.project-diagram svg { width: 100%; height: 100%; }
.project-body { padding: 24px 28px 28px; }
.project-meta {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 12px;
  font-family: "Geist Mono", monospace;
  font-size: 11px;
  color: var(--muted);
  letter-spacing: -0.005em;
}
.project-meta .org { color: var(--ink); font-weight: 500; }
.project-meta .dot { color: var(--rule); }
.project h4 {
  font-size: 22px;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.018em;
  margin: 0 0 10px;
}
.project p {
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--soft);
  margin: 0;
}
.project-tags {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--rule-2);
}
.project-tags span {
  font-family: "Geist Mono", monospace;
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.02em;
}
.project-tags span + span::before {
  content: "·"; margin-right: 6px; color: var(--rule);
}

/* Diagram primitive styles */
.dg-node {
  fill: var(--bg-2);
  stroke: var(--soft);
  stroke-width: 1;
}
.dg-node.primary {
  fill: var(--ink);
  stroke: var(--ink);
}
.dg-label {
  font-family: "Geist Mono", "SFMono-Regular", monospace;
  font-size: 9.5px;
  fill: var(--soft);
  letter-spacing: 0;
}
.dg-label.on-primary { fill: var(--bg); }
.dg-edge {
  stroke: var(--soft);
  stroke-width: 0.8;
  fill: none;
}
.dg-edge-dashed {
  stroke: var(--muted);
  stroke-width: 0.6;
  stroke-dasharray: 3 3;
  fill: none;
}

/* ── Publications (categorized) ───────────────────────────────────────── */
.pubs-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule);
}
.pub-cat {
  padding: 36px 36px 40px;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.pub-cat:nth-child(2n) { border-right: none; }
.pub-cat-head {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 22px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule-2);
}
.pub-cat h3 {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: -0.012em;
  margin: 0;
}
.pub-cat .count {
  font-family: "Geist Mono", monospace;
  font-size: 11px;
  color: var(--muted);
}
.pub-list { display: flex; flex-direction: column; gap: 0; }
.pub-row {
  display: grid;
  grid-template-columns: 52px 1fr 90px;
  gap: 12px;
  padding: 12px 0;
  align-items: baseline;
  border-bottom: 1px solid var(--rule-2);
  transition: padding-left .15s;
}
.pub-row:last-child { border-bottom: none; }
.pub-row:hover { padding-left: 6px; }
.pub-row:hover .title { color: var(--pop); }
.pub-row .year {
  font-family: "Geist Mono", monospace;
  font-size: 11.5px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.pub-row .title {
  font-size: 14.5px;
  line-height: 1.4;
  color: var(--ink);
  letter-spacing: -0.005em;
  text-wrap: balance;
}
.pub-row .venue {
  font-family: "Geist Mono", monospace;
  font-size: 11px;
  color: var(--soft);
  text-align: right;
}
.pubs-foot {
  padding: 24px 0;
  text-align: center;
  font-family: "Geist Mono", monospace;
  font-size: 12px;
  color: var(--muted);
}
.pubs-foot a {
  color: var(--ink);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1px;
  transition: border-color .15s;
}
.pubs-foot a:hover { border-color: var(--ink); }

/* ── Patents (collapsible disclosure) ─────────────────────────────────── */
.patents { margin-top: 6px; }
.patents summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 26px 0 4px;
}
.patents summary::-webkit-details-marker { display: none; }
.patents .pt-label {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}
.patents .pt-count { font-size: 13.5px; color: var(--ink); }
.patents .pt-toggle {
  margin-left: auto;
  font-size: 11px;
  color: var(--soft);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1px;
  transition: color .15s, border-color .15s;
}
.patents summary:hover .pt-toggle,
.patents[open] .pt-toggle { color: var(--ink); border-color: var(--soft); }
.pt-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0 56px;
  margin-top: 16px;
}
.pt-row {
  display: grid;
  grid-template-columns: 124px 1fr 44px;
  gap: 14px;
  padding: 9px 0;
  align-items: baseline;
  border-bottom: 1px solid var(--rule-2);
  transition: padding-left .15s;
}
.pt-row:hover { padding-left: 6px; }
.pt-row:hover .pt-title { color: var(--pop); }
.pt-num { font-size: 11px; color: var(--muted); }
.pt-title { font-size: 13.5px; color: var(--ink); letter-spacing: -0.005em; line-height: 1.35; }
.pt-yr { font-size: 11px; color: var(--soft); text-align: right; }
@media (max-width: 760px) {
  .pt-list { grid-template-columns: 1fr; gap: 0; }
  .pt-row { grid-template-columns: 100px 1fr 40px; }
}

/* ── Timeline ─────────────────────────────────────────────────────────── */
.timeline {
  display: flex; flex-direction: column;
  border-top: 1px solid var(--rule);
}
.tl-row {
  display: grid;
  grid-template-columns: 140px 1fr 200px;
  gap: 32px;
  padding: 28px 0;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
  transition: background .15s;
}
.tl-row:hover { background: color-mix(in oklab, var(--bg-2), transparent 50%); }
.tl-row:hover .yr { color: var(--pop); }
.tl-row .yr {
  font-family: "Geist Mono", monospace;
  font-size: 13px;
  color: var(--muted);
  letter-spacing: -0.005em;
  font-variant-numeric: tabular-nums;
}
.tl-row .role-cell .org {
  font-size: 19px;
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--ink);
  margin-bottom: 4px;
}
.tl-row .role-cell .role {
  font-size: 14px;
  color: var(--soft);
}
.tl-row .place {
  font-family: "Geist Mono", monospace;
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-align: right;
}

/* ── Off-duty ─────────────────────────────────────────────────────────── */
.off-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 56px;
  border-top: 1px solid var(--rule);
  padding-top: 44px;
}
.off-card {
  padding: 0;
  border: none;
  display: flex; flex-direction: column; gap: 12px;
  align-items: flex-start;
}
.off-card .ico {
  width: 28px; height: 28px;
  color: var(--soft);
  margin-bottom: 8px;
}
.off-card h4 {
  font-size: 17px;
  font-weight: 500;
  letter-spacing: -0.012em;
  margin: 0;
}
.off-card p {
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--soft);
  margin: 0;
}

/* ── Footer / contact ─────────────────────────────────────────────────── */
.foot {
  border-top: 1px solid var(--rule);
  padding: 80px 0 56px;
  background: var(--bg-2);
}
.foot-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-bottom: 64px;
}
.foot h2 {
  font-size: clamp(36px, 4.4vw, 56px);
  font-weight: 500;
  line-height: 1.04;
  letter-spacing: -0.025em;
  margin: 0;
  max-width: 16ch;
}
.foot-links {
  display: flex; flex-direction: column;
  align-items: flex-end; justify-content: flex-end;
  gap: 6px;
}
.foot-links a {
  font-family: "Geist Mono", monospace;
  font-size: 13px;
  color: var(--soft);
  padding: 4px 0 6px;
  letter-spacing: -0.005em;
  background-image: linear-gradient(var(--pop), var(--pop));
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 1px;
  transition: color .2s ease, background-size .28s cubic-bezier(.4,0,.2,1);
}
.foot-links a:hover {
  color: var(--pop);
  background-size: 100% 1px;
}
.foot-links a .arrow { color: var(--muted); margin-left: 6px; }
.foot-baseline {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 28px;
  border-top: 1px solid var(--rule);
  font-family: "Geist Mono", monospace;
  font-size: 11px;
  color: var(--muted);
  letter-spacing: -0.005em;
}

/* ── Scroll fade-in ────────────────────────────────────────────────────── */
[data-fade] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .8s cubic-bezier(.2,.7,.2,1), transform .8s cubic-bezier(.2,.7,.2,1);
}
[data-fade].in {
  opacity: 1;
  transform: translateY(0);
}

/* ── Responsive ────────────────────────────────────────────────────────── */
@media (max-width: 960px) {
  .nav { padding: 14px 20px; }
  .container { padding: 0 20px; }
  section { padding: 80px 0; }
  .hero { min-height: auto; padding-top: 100px; }
  .metrics { grid-template-columns: repeat(2, 1fr); }
  .metric:nth-child(2n) { border-right: none; }
  .metric { border-bottom: 1px solid var(--rule-2); }
  .now-grid { grid-template-columns: 1fr; gap: 16px; }
  .projects { grid-template-columns: 1fr; }
  .pubs-grid { grid-template-columns: 1fr; }
  .pub-cat:nth-child(2n) { border-right: 1px solid var(--rule); }
  .pub-cat { border-right: none; }
  .tl-row { grid-template-columns: 90px 1fr; }
  .tl-row .place { grid-column: 2; text-align: left; padding-top: 4px; }
  .off-grid { gap: 40px; }
  .foot-grid { grid-template-columns: 1fr; }
  .foot-links { align-items: flex-start; }
  .foot-baseline { flex-direction: column; gap: 12px; align-items: flex-start; }
  .nav-links a:not(:last-child) { display: none; }
}
@media (max-width: 560px) {
  .metrics { grid-template-columns: 1fr; }
  .metric { border-right: none; }
  .hero h1 { font-size: 44px; }
}