/* =========================================================
   jameshelbling.com — "Systems"
   Swiss / modernist. Off-white paper, ink, one signal blue
   (pulled from the suit in the portrait). Geist for type,
   Geist Mono for labels, a visible 12-column grid.
   ========================================================= */

:root {
  /* Palette */
  --bg: #f6f6f3;
  --surface: #ffffff;
  --surface-2: #fbfbf9;
  --ink: #0c0c0e;
  --ink-2: #35353b;
  --muted: #66666e;
  --line: #dcdcd5;
  --line-2: #c4c4bc;
  --grid: rgba(12, 12, 14, 0.045);
  --blue: #1f47d6;
  --blue-2: #1736a8;
  --blue-soft: #e9eefc;
  --blue-on-dark: #7590ff;
  --green: #1d8a5c;
  --dark: #0c0c0e;
  --dark-fg: #f2f2ee;
  --dark-muted: #a3a3ab;
  --dark-line: rgba(255, 255, 255, 0.14);

  /* Type */
  --sans: "Geist", "Inter", -apple-system, "Segoe UI", system-ui, sans-serif;
  --mono: "Geist Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  /* Layout */
  --max: 1280px;
  --g: 40px;
  --nav-h: 64px;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

/* ---------- Base ---------- */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-padding-top: calc(var(--nav-h) + 24px); }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body {
  position: relative;
  background: var(--bg);
  color: var(--ink);
  font: 400 17px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
::selection { background: var(--blue); color: #fff; }
a { color: inherit; text-decoration: none; transition: color .15s; }
img { display: block; max-width: 100%; height: auto; }
figure { margin: 0; }
h1, h2, h3, h4 { margin: 0; font-weight: 600; letter-spacing: -0.035em; color: var(--ink); text-wrap: balance; }
p { margin: 0 0 1.1em; text-wrap: pretty; }
em { font-style: normal; color: var(--blue); }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; }

.mono {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.wrap {
  position: relative;
  z-index: 1;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--g);
}

/* visible 12-column grid behind everything */
.gridlines {
  position: fixed;
  top: 0; bottom: 0; left: 50%;
  z-index: 0;
  width: min(calc(100% - 2 * var(--g)), calc(var(--max) - 2 * var(--g)));
  transform: translateX(-50%);
  background: repeating-linear-gradient(90deg, var(--grid) 0 1px, transparent 1px calc(100% / 12));
  border-right: 1px solid var(--grid);
  pointer-events: none;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 20px;
  font: 500 0.92rem/1 var(--sans);
  letter-spacing: -0.005em;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--ink);
  cursor: pointer;
  transition: background .2s, color .2s, border-color .2s;
}
.btn .ar { font-family: var(--mono); transition: transform .25s var(--ease); }
.btn:hover .ar { transform: translateX(4px); }
.btn-blue { background: var(--blue); border-color: var(--blue); color: #fff; }
.btn-blue:hover { background: var(--ink); border-color: var(--ink); color: #fff; }
.btn-out:hover { background: var(--ink); color: #fff; }
.btn-light { background: #fff; border-color: #fff; color: var(--ink); }
.btn-light:hover { background: var(--ink); border-color: var(--ink); color: #fff; }
.btn-ghost-light { color: #fff; border-color: rgba(255, 255, 255, 0.5); }
.btn-ghost-light:hover { border-color: #fff; background: rgba(255, 255, 255, 0.08); }

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(246, 246, 243, 0.86);
  backdrop-filter: saturate(150%) blur(12px);
  -webkit-backdrop-filter: saturate(150%) blur(12px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .25s, background-color .3s, border-color .3s;
}
.nav.scrolled { box-shadow: 0 12px 32px -28px rgba(12, 12, 14, 0.5); }
.nav-inner {
  position: relative;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--g);
  height: var(--nav-h);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  justify-self: start;
  font-weight: 600;
  font-size: 1.02rem;
  letter-spacing: -0.02em;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 28px; height: 28px;
  background: var(--blue);
  color: #fff;
  font: 500 0.7rem/1 var(--mono);
  letter-spacing: 0;
  transition: background .2s;
}
.brand:hover .brand-mark { background: var(--ink); }
.status {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  white-space: nowrap;
}
.status::before {
  content: "";
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px rgba(29, 138, 92, 0.15);
}
.nav-links {
  display: flex;
  justify-content: flex-end;
  gap: 26px;
}
.nav-links a { color: var(--muted); padding: 6px 0; }
.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--ink); }
.nav-links a.active::before { content: "● "; color: var(--blue); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  justify-self: end;
  padding: 9px 12px;
  background: none;
  border: 1px solid var(--ink);
  color: var(--ink);
  cursor: pointer;
}
.nav-toggle .bars { position: relative; width: 14px; height: 8px; }
.nav-toggle .bars::before,
.nav-toggle .bars::after {
  content: "";
  position: absolute; left: 0; right: 0;
  height: 1.5px;
  background: currentColor;
  transition: transform .25s var(--ease), top .25s var(--ease);
}
.nav-toggle .bars::before { top: 0; }
.nav-toggle .bars::after { top: 6.5px; }
.nav.open .nav-toggle { background: var(--ink); color: #fff; }
.nav.open .nav-toggle .bars::before { top: 3.25px; transform: rotate(45deg); }
.nav.open .nav-toggle .bars::after { top: 3.25px; transform: rotate(-45deg); }

@media (max-width: 1080px) {
  .nav-inner .status { display: none; }
  .nav-inner { grid-template-columns: 1fr auto; }
}
@media (max-width: 760px) {
  :root { --g: 20px; --nav-h: 60px; }
  .gridlines { background: repeating-linear-gradient(90deg, var(--grid) 0 1px, transparent 1px calc(100% / 4)); }
  .js .nav-toggle { display: inline-flex; }
  .js .nav-links {
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    padding: 8px var(--g) 24px;
    background: var(--bg);
    border-bottom: 1px solid var(--ink);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-6px);
    transition: opacity .2s, transform .2s var(--ease), visibility 0s .2s;
  }
  .js .nav.open .nav-links {
    visibility: visible;
    opacity: 1;
    transform: none;
    transition: opacity .2s, transform .25s var(--ease);
  }
  .js .nav-links a {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    padding: 16px 0;
    border-bottom: 1px solid var(--line);
    font: 600 1.7rem/1.1 var(--sans);
    letter-spacing: -0.035em;
    text-transform: none;
    color: var(--ink);
  }
  .js .nav-links a.active { color: var(--blue); }
  .js .nav-links a.active::before { content: none; }
  html:not(.js) .nav-inner { grid-template-columns: 1fr; height: auto; padding-top: 14px; padding-bottom: 10px; gap: 8px; }
  html:not(.js) .nav-links { justify-content: flex-start; flex-wrap: wrap; gap: 4px 18px; }
}

/* ---------- Index row (top of every page) ---------- */
.index-row {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  padding: 40px 0 18px;
  border-bottom: 1px solid var(--ink);
  color: var(--muted);
}
.index-row > :first-child { grid-column: span 3; color: var(--ink); }
.index-row > * { grid-column: span 2; }
.index-row a:hover { color: var(--blue); }
.index-row b { color: var(--blue); font-weight: 500; margin-right: 6px; }
@media (max-width: 1080px) {
  .index-row { row-gap: 10px; }
  .index-row > :first-child { grid-column: 1 / -1; }
  .index-row > * { grid-column: span 3; }
}
@media (max-width: 760px) {
  .index-row { grid-template-columns: 1fr 1fr; row-gap: 8px; padding-top: 28px; }
  .index-row > * { grid-column: auto; }
  .index-row > :first-child { grid-column: 1 / -1; }
}

/* ---------- Home hero (dark, cinematic) ---------- */
.hero-dark {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-height: max(780px, 100vh);
  min-height: max(780px, 100svh);
  margin-top: calc(-1 * var(--nav-h));
  padding-top: var(--nav-h);
  background: var(--dark);
  color: var(--dark-fg);
}
.hero-dark::before {
  /* blue glow behind the portrait */
  content: "";
  position: absolute; inset: 0;
  z-index: -3;
  background:
    radial-gradient(36% 55% at 74% 40%, rgba(31, 71, 214, 0.28), transparent 72%),
    radial-gradient(55% 60% at 0% 0%, rgba(255, 255, 255, 0.04), transparent 60%);
}
.hero-dark::after {
  /* the 12-column grid, light on dark */
  content: "";
  position: absolute;
  top: 0; bottom: 0; left: 50%;
  z-index: -2;
  width: min(calc(100% - 2 * var(--g)), calc(var(--max) - 2 * var(--g)));
  transform: translateX(-50%);
  background: repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.05) 0 1px, transparent 1px calc(100% / 12));
  border-right: 1px solid rgba(255, 255, 255, 0.05);
  pointer-events: none;
}
.hero-photo {
  position: absolute;
  z-index: -1;
  top: 0; right: 0; bottom: 0;
  width: min(58%, 940px);
  height: 100%;
  object-fit: cover;
  object-position: 50% 12%;
  -webkit-mask-image: linear-gradient(90deg, transparent 0%, rgba(0, 0, 0, 0.6) 22%, #000 46%), linear-gradient(0deg, transparent 0%, #000 30%);
  -webkit-mask-composite: source-in;
  mask-image: linear-gradient(90deg, transparent 0%, rgba(0, 0, 0, 0.6) 22%, #000 46%), linear-gradient(0deg, transparent 0%, #000 30%);
  mask-composite: intersect;
}
.hero-inner { flex: 1; display: flex; flex-direction: column; width: 100%; }
.hero-dark .index-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  max-width: min(760px, 62%);
  padding-top: 28px;
  border-bottom-color: rgba(255, 255, 255, 0.22);
  color: var(--dark-muted);
}
.hero-dark .index-row > * { color: var(--dark-muted); }
.hero-dark .index-row b { color: var(--blue-on-dark); }
.hero-body { flex: 1; display: flex; align-items: center; padding: 52px 0 48px; }
.hero-copy { max-width: min(760px, 62%); }
.hero-dark h1 {
  margin-bottom: 28px;
  font-size: clamp(2.4rem, 3.75vw, 3.7rem);
  line-height: 1.0;
  letter-spacing: -0.05em;
  color: var(--dark-fg);
}
.hero-dark h1 em { color: var(--blue-on-dark); }
.hero-dark .sub {
  max-width: 520px;
  margin: 0 0 38px;
  font-size: 1.18rem;
  line-height: 1.5;
  letter-spacing: -0.012em;
  color: #b9b9c1;
}
.actions { display: flex; flex-wrap: wrap; gap: 10px; }

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid rgba(255, 255, 255, 0.22);
}
.hero-stats .stat { padding: 22px 28px 40px; }
.hero-stats .stat:first-child { padding-left: 0; }
.hero-stats .stat + .stat { border-left: 1px solid var(--dark-line); }
.hero-stats .mono { color: #8b8b93; }
.hero-stats b {
  display: block;
  margin: 16px 0 8px;
  font: 500 clamp(2.3rem, 3.4vw, 3.2rem)/1 var(--sans);
  letter-spacing: -0.055em;
  color: var(--dark-fg);
}
.hero-stats b sup { font-size: 0.5em; color: var(--blue-on-dark); vertical-align: top; position: relative; top: 0.1em; margin-left: 2px; }
.hero-stats p { margin: 0; color: var(--dark-muted); font-size: 0.92rem; line-height: 1.45; }
.hero-vert {
  position: absolute;
  right: 22px; top: 50%;
  transform: translateY(-50%) rotate(90deg);
  transform-origin: right center;
  color: #6f6f78;
  white-space: nowrap;
}

/* nav while it sits over the dark hero (toggled by site.js) */
.nav.nav-dark { background: rgba(12, 12, 14, 0.62); border-bottom-color: rgba(255, 255, 255, 0.12); }
.nav-dark .brand { color: var(--dark-fg); }
.nav-dark .status { color: var(--dark-muted); }
.nav-dark .nav-links a { color: var(--dark-muted); }
.nav-dark .nav-links a:hover,
.nav-dark .nav-links a.active { color: #fff; }
.nav-dark .nav-links a.active::before { color: var(--blue-on-dark); }
.nav-dark .nav-toggle { border-color: rgba(255, 255, 255, 0.55); color: #fff; }
.nav-dark.open .nav-toggle { background: #fff; color: var(--ink); }
@media (max-width: 760px) {
  .js .nav-dark .nav-links { background: var(--dark); border-bottom-color: rgba(255, 255, 255, 0.22); }
  .js .nav-dark .nav-links a { color: var(--dark-fg); border-bottom-color: var(--dark-line); }
  .js .nav-dark .nav-links a.active { color: var(--blue-on-dark); }
}

@media (max-width: 1200px) {
  .hero-copy, .hero-dark .index-row { max-width: 56%; }
}
@media (max-width: 1100px) {
  .hero-vert { display: none; }
}
@media (max-width: 860px) {
  .hero-dark { min-height: 0; }
  .hero-photo {
    position: relative;
    width: 100%;
    height: 62vh; min-height: 400px; max-height: 620px;
    object-position: 50% 6%;
    -webkit-mask-image: linear-gradient(0deg, transparent 0%, #000 40%);
    -webkit-mask-composite: source-over;
    mask-image: linear-gradient(0deg, transparent 0%, #000 40%);
    mask-composite: add;
  }
  .hero-dark .index-row { display: none; }
  .hero-body { padding: 0 0 48px; margin-top: -110px; }
  .hero-copy { max-width: none; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .hero-stats .stat { padding: 20px 16px 28px; }
  .hero-stats .stat:nth-child(odd) { padding-left: 0; border-left: 0; }
  .hero-stats .stat:nth-child(n+3) { border-top: 1px solid var(--dark-line); }
}

/* figure with print crop marks (About) */
.fig { position: relative; }
.fig-frame { position: relative; }
.fig-img {
  position: relative;
  aspect-ratio: 4 / 5;
  overflow: hidden;
  background: #e6e6e1;
}
.fig-img img { width: 100%; height: 100%; object-fit: cover; object-position: center top; }
.fig .mark { position: absolute; width: 14px; height: 14px; border: 0 solid var(--ink); }
.fig .tl { top: -7px; left: -7px; border-top-width: 1px; border-left-width: 1px; }
.fig .tr { top: -7px; right: -7px; border-top-width: 1px; border-right-width: 1px; }
.fig .bl { bottom: -7px; left: -7px; border-bottom-width: 1px; border-left-width: 1px; }
.fig .br { bottom: -7px; right: -7px; border-bottom-width: 1px; border-right-width: 1px; }
.fig figcaption {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 16px;
  color: var(--muted);
}

/* ---------- Sections ---------- */
section { position: relative; padding: 128px 0; }
.sec-head {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  align-items: end;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--ink);
}
.sec-head .label { grid-column: 1 / span 3; align-self: start; padding-top: 12px; color: var(--blue); }
.sec-head h2 { grid-column: 4 / span 6; font-size: clamp(2.2rem, 4vw, 3.6rem); line-height: 1; letter-spacing: -0.048em; }
.sec-head .count { grid-column: 10 / span 3; text-align: right; color: var(--muted); }
.sec-head .count a:hover { color: var(--blue); }
@media (max-width: 960px) {
  section { padding: 88px 0; }
  .sec-head { grid-template-columns: 1fr; gap: 14px; }
  .sec-head > * { grid-column: 1 !important; text-align: left !important; padding-top: 0 !important; }
}

/* ---------- Spec table (selected work) ---------- */
.thead, .tr { display: grid; grid-template-columns: repeat(12, 1fr); }
.thead { padding: 14px 0; border-bottom: 1px solid var(--line); color: var(--muted); }
.c-yr { grid-column: 1 / span 1; }
.c-org { grid-column: 2 / span 2; padding-right: 12px; }
.c-prog { grid-column: 4 / span 6; padding-right: 48px; }
.c-out { grid-column: 10 / span 3; }
.tr { position: relative; padding: 34px 0; border-bottom: 1px solid var(--line); }
.tr .c-yr { color: var(--blue); }
.tr .c-org { color: var(--ink-2); }
.tr h3 { font-size: 1.65rem; line-height: 1.1; letter-spacing: -0.038em; margin-bottom: 10px; }
.tr p { margin: 0; color: var(--muted); font-size: 0.97rem; max-width: 58ch; }
.out { display: flex; flex-direction: column; gap: 8px; }
.out div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--line-2);
}
.out div:last-child { border-bottom: 0; }
.out b { font: 600 1.3rem/1 var(--sans); letter-spacing: -0.035em; }
.out span { color: var(--muted); text-align: right; }
@media (max-width: 960px) {
  .thead { display: none; }
  .tr { grid-template-columns: 1fr 1fr; gap: 10px 0; padding: 28px 0; }
  .tr .c-yr { grid-column: 1; }
  .tr .c-org { grid-column: 2; text-align: right; padding-right: 0; }
  .tr .c-prog { grid-column: 1 / -1; padding-right: 0; margin-top: 6px; }
  .tr .c-out { grid-column: 1 / -1; margin-top: 12px; }
}

/* ---------- Thesis (dark, stack diagram) ---------- */
.thesis { background: var(--dark); color: var(--dark-fg); }
.thesis .wrap { display: grid; grid-template-columns: repeat(12, 1fr); align-items: center; }
.thesis .copy { grid-column: 1 / span 6; padding-right: 48px; }
.thesis .label { color: var(--blue-on-dark); }
.thesis blockquote {
  margin: 28px 0 32px;
  font: 500 clamp(1.8rem, 2.9vw, 2.6rem)/1.14 var(--sans);
  letter-spacing: -0.038em;
  color: var(--dark-fg);
}
.thesis blockquote em { color: var(--blue-on-dark); }
.thesis .copy p { margin: 0; color: var(--dark-muted); max-width: 46ch; }
.thesis .sig { margin-top: 28px; color: var(--dark-muted); }
.stack { grid-column: 8 / span 5; display: flex; flex-direction: column; gap: 10px; }
.layer {
  display: grid;
  grid-template-columns: 92px 1fr;
  align-items: center;
  padding: 20px 22px;
  border: 1px solid var(--dark-line);
  background: rgba(255, 255, 255, 0.03);
}
.layer .mono { color: #8b8b93; }
.layer b { font: 500 1.3rem/1.1 var(--sans); letter-spacing: -0.025em; }
.layer.ai { margin: 0 40px 6px; background: var(--blue); border-color: var(--blue); }
.layer.ai .mono { color: rgba(255, 255, 255, 0.72); }
.layer.ai small { display: block; margin-top: 4px; font: 400 0.85rem/1.4 var(--sans); color: rgba(255, 255, 255, 0.82); letter-spacing: 0; }
.stack .base {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  padding: 14px 22px;
  border-top: 2px solid var(--dark-fg);
  color: var(--dark-fg);
}
/* layers build up from the bottom when revealed */
.js .stack.reveal:not(.in) .layer { opacity: 0; transform: translateY(14px); }
.stack .layer { transition: opacity .6s var(--ease), transform .6s var(--ease); }
.stack .layer:nth-child(4) { transition-delay: .05s; }
.stack .layer:nth-child(3) { transition-delay: .2s; }
.stack .layer:nth-child(2) { transition-delay: .35s; }
.stack .layer:nth-child(1) { transition-delay: .55s; }
.js .stack.reveal:not(.in) { opacity: 1; transform: none; }
@media (max-width: 960px) {
  .thesis .wrap { grid-template-columns: 1fr; }
  .thesis .copy, .stack { grid-column: 1; padding-right: 0; }
  .stack { margin-top: 48px; }
}
@media (max-width: 560px) {
  .layer { grid-template-columns: 76px 1fr; padding: 16px; }
  .layer.ai { margin: 0 0 6px; }
}

/* ---------- Cards (labs + writing) ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-left: 1px solid var(--line);
}
.card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 320px;
  padding: 32px 32px 30px;
  background: var(--surface);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: background .2s;
}
.card.alt { background: var(--blue-soft); }
a.card:hover { background: var(--surface-2); }
a.card.alt:hover { background: #e1e8fb; }
.card .top { display: flex; justify-content: space-between; color: var(--muted); }
.live { color: var(--green); }
.live::before { content: "● "; }
.card h3 { margin-top: 18px; font-size: 1.7rem; line-height: 1.08; }
.card p { margin: 0; color: var(--muted); font-size: 0.97rem; }
.card .go {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--ink);
}
.card .go .ar { color: var(--blue); transition: transform .25s var(--ease); }
a.card:hover .go .ar { transform: translateX(4px); }
@media (max-width: 960px) {
  .cards { grid-template-columns: 1fr; }
  .card { min-height: 0; }
}

/* ---------- CTA ---------- */
.cta { background: var(--blue); color: #fff; padding: 112px 0; }
.cta .wrap { display: grid; grid-template-columns: repeat(12, 1fr); align-items: end; }
.cta .label { grid-column: 1 / -1; margin-bottom: 28px; color: rgba(255, 255, 255, 0.72); }
.cta h2 { grid-column: 1 / span 9; color: #fff; font-size: clamp(2.4rem, 5vw, 4.6rem); line-height: 0.98; letter-spacing: -0.052em; }
.cta .side { grid-column: 10 / span 3; display: flex; flex-direction: column; gap: 12px; }
.cta .side p { margin: 0 0 6px; color: rgba(255, 255, 255, 0.85); font-size: 0.98rem; }
@media (max-width: 960px) {
  .cta { padding: 88px 0; }
  .cta .wrap { grid-template-columns: 1fr; gap: 28px; }
  .cta h2, .cta .side { grid-column: 1; }
  .cta .side { max-width: 360px; }
}

/* ---------- Footer ---------- */
footer { position: relative; z-index: 1; background: var(--dark); color: var(--dark-muted); padding: 72px 0 36px; }
.foot-top { display: grid; grid-template-columns: repeat(12, 1fr); gap: 32px 24px; margin-bottom: 56px; }
.foot-top .col { grid-column: span 2; display: flex; flex-direction: column; gap: 10px; }
.foot-top .col .mono { color: #6f6f78; margin-bottom: 6px; }
.foot-top .col a { color: var(--dark-fg); width: fit-content; }
.foot-top .col a:hover { color: var(--blue-on-dark); }
.foot-top .about { grid-column: 1 / span 6; max-width: 42ch; }
.foot-top .about p { margin: 0; }
.footer-word {
  margin: 0 0 40px;
  font: 600 clamp(3rem, 10.6vw, 9.8rem)/0.9 var(--sans);
  letter-spacing: -0.065em;
  color: var(--dark-fg);
}
.footer-word span { color: var(--blue); }
.foot-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 22px;
  border-top: 1px solid var(--dark-line);
}
.foot-bottom a:hover { color: #fff; }
@media (max-width: 1080px) {
  .foot-top { grid-template-columns: repeat(3, 1fr); }
  .foot-top .about { grid-column: 1 / -1; }
  .foot-top .col { grid-column: span 1; }
}

.footer-min { padding: 24px 0; }
.footer-min .foot-bottom { border-top: 0; padding-top: 0; }

/* ---------- Inner page header ---------- */
.page-head { padding: 72px 0 72px; display: grid; grid-template-columns: repeat(12, 1fr); }
.page-head h1 {
  grid-column: 1 / span 10;
  font-size: clamp(2.6rem, 5.4vw, 5rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
}
.page-head .lead {
  grid-column: 1 / span 7;
  margin: 32px 0 0;
  font-size: 1.22rem;
  line-height: 1.5;
  letter-spacing: -0.012em;
  color: var(--ink-2);
}
.page-head .actions { margin-top: 36px; }
@media (max-width: 960px) {
  .page-head { grid-template-columns: 1fr; padding: 48px 0 56px; }
  .page-head h1, .page-head .lead { grid-column: 1; }
}

/* ---------- Prose ---------- */
.prose { font-size: 1.06rem; line-height: 1.72; color: var(--ink-2); }
.prose > :first-child { margin-top: 0; }
.prose .intro {
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  line-height: 1.2;
  letter-spacing: -0.035em;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 0.9em;
}
.prose .chapter { display: block; margin: 72px 0 14px; padding-top: 18px; border-top: 1px solid var(--ink); color: var(--blue); }
.prose h2 { font-size: clamp(1.7rem, 2.6vw, 2.2rem); line-height: 1.1; letter-spacing: -0.04em; margin: 0 0 0.7em; }
.prose p { margin: 0 0 1.25em; }
.prose strong { color: var(--ink); font-weight: 600; }
.prose ul { list-style: none; padding: 0; margin: 0 0 1.6em; border-top: 1px solid var(--line); }
.prose li { position: relative; padding: 14px 0 14px 34px; border-bottom: 1px solid var(--line); margin: 0; }
.prose li::before { content: "→"; position: absolute; left: 4px; top: 14px; font-family: var(--mono); color: var(--blue); }
.prose blockquote {
  margin: 2em 0;
  padding: 4px 0 4px 26px;
  border-left: 2px solid var(--blue);
  font: 500 1.45rem/1.35 var(--sans);
  letter-spacing: -0.028em;
  color: var(--ink);
}
.prose a { color: var(--blue); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
.prose a:hover { color: var(--ink); }
.prose .fig { margin: 48px 0; }

/* ---------- About layout ---------- */
.about-grid { display: grid; grid-template-columns: repeat(12, 1fr); padding-bottom: 128px; }
.about-grid .prose { grid-column: 1 / span 7; padding-top: 56px; }
.about-aside { grid-column: 9 / span 4; padding-top: 56px; }
.spec-card {
  position: sticky;
  top: calc(var(--nav-h) + 32px);
  background: var(--surface);
  border: 1px solid var(--ink);
}
.spec-card .spec-title { display: flex; justify-content: space-between; padding: 12px 16px; border-bottom: 1px solid var(--ink); }
.spec-card .spec-title span + span { color: var(--muted); }
.spec-card img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; object-position: center 12%; border-bottom: 1px solid var(--line); }
.spec { margin: 0; }
.spec div { display: grid; grid-template-columns: 96px 1fr; gap: 12px; padding: 13px 16px; border-bottom: 1px solid var(--line); }
.spec dt { color: var(--muted); padding-top: 3px; }
.spec dd { margin: 0; font-size: 0.93rem; line-height: 1.45; }
.spec-card .actions { padding: 16px; gap: 8px; }
.spec-card .actions .btn { flex: 1; padding: 13px 14px; font-size: 0.86rem; }

.timeline { border-top: 1px solid var(--ink); margin: 8px 0 0; }
.t-row { display: grid; grid-template-columns: 130px 1fr; gap: 6px 24px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.t-row .when { color: var(--blue); padding-top: 4px; }
.t-row .what { color: var(--ink); font-weight: 500; letter-spacing: -0.015em; line-height: 1.4; }
.t-row .detail { grid-column: 2; margin: 0; color: var(--muted); font-size: 0.95rem; }
.t-row.now .when::before { content: "● "; color: var(--green); }

.creds { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--ink); border-left: 1px solid var(--line); margin-top: 8px; }
.cred { padding: 18px 18px 20px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--surface); }
.cred b { display: block; font: 600 1.25rem/1.15 var(--sans); letter-spacing: -0.03em; color: var(--ink); margin-bottom: 4px; }
.cred span { font-size: 0.88rem; color: var(--muted); line-height: 1.4; display: block; }
.edu { margin-top: 24px; }
.edu div { display: grid; grid-template-columns: 64px 1fr; gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 0.95rem; }
.edu .mono { color: var(--blue); padding-top: 3px; }

@media (max-width: 960px) {
  .about-grid { grid-template-columns: 1fr; padding-bottom: 88px; }
  .about-grid .prose, .about-aside { grid-column: 1; }
  .about-aside { order: -1; padding-top: 40px; max-width: 520px; }
  .spec-card { position: static; display: grid; grid-template-columns: 160px 1fr; }
  .spec-card .spec-title { grid-column: 1 / -1; }
  .spec-card img { aspect-ratio: 4 / 5; height: 100%; border-bottom: 0; border-right: 1px solid var(--line); }
  .spec-card .actions { grid-column: 1 / -1; border-top: 1px solid var(--line); }
}
@media (max-width: 520px) {
  .spec-card { grid-template-columns: 1fr; }
  .spec-card img { aspect-ratio: 1 / 1; border-right: 0; border-bottom: 1px solid var(--line); }
  .t-row { grid-template-columns: 1fr; }
  .t-row .detail { grid-column: 1; }
  .creds { grid-template-columns: 1fr; }
}

/* ---------- Labs page ---------- */
.lab-sheets { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--ink); border-left: 1px solid var(--line); }
.lab-sheet { display: flex; flex-direction: column; background: var(--surface); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); scroll-margin-top: calc(var(--nav-h) + 24px); }
.lab-sheet .head { display: flex; justify-content: space-between; padding: 16px 28px; border-bottom: 1px solid var(--line); color: var(--muted); }
.lab-sheet .body { padding: 32px 28px 28px; }
.lab-sheet h2 { font-size: clamp(1.9rem, 3vw, 2.5rem); line-height: 1.02; letter-spacing: -0.045em; margin-bottom: 18px; }
.lab-sheet .body p { margin: 0; color: var(--ink-2); max-width: 56ch; }
.lab-sheet .spec { margin-top: auto; border-top: 1px solid var(--line); }
.lab-sheet .spec div { grid-template-columns: 110px 1fr; padding: 13px 28px; }
.lab-sheet .spec div:last-child { border-bottom: 0; }
.lab-sheet .body p + p { margin-top: 1em; }
/* full-width sheet: body left, spec right */
.lab-sheet.wide { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1fr; align-content: start; }
.lab-sheet.wide .head { grid-column: 1 / -1; }
.lab-sheet.wide .spec { margin-top: 0; border-top: 0; border-left: 1px solid var(--line); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; padding: 0; margin: 0; }
.chips li { padding: 5px 10px; border: 1px solid var(--line-2); background: var(--surface-2); font: 400 0.7rem/1.2 var(--mono); letter-spacing: 0.03em; text-transform: uppercase; color: var(--ink-2); }
.note-row { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-top: 40px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); }
@media (max-width: 860px) {
  .lab-sheets { grid-template-columns: 1fr; }
  .lab-sheet.wide { grid-template-columns: 1fr; }
  .lab-sheet.wide .spec { border-left: 0; border-top: 1px solid var(--line); }
  .lab-sheet .head, .lab-sheet .body { padding-left: 20px; padding-right: 20px; }
  .lab-sheet .spec div { padding: 12px 20px; grid-template-columns: 90px 1fr; }
}

/* ---------- Writing page ---------- */
.post {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  padding: 36px 0;
  border-bottom: 1px solid var(--line);
  transition: background .2s;
}
.post:hover { background: var(--surface-2); }
.p-meta { grid-column: 1 / span 3; display: flex; flex-direction: column; gap: 8px; color: var(--muted); }
.p-meta b { color: var(--blue); font-weight: 500; }
.p-body { grid-column: 4 / span 6; padding-right: 48px; }
.p-body h3 { font-size: clamp(1.6rem, 2.4vw, 2rem); line-height: 1.08; letter-spacing: -0.04em; margin-bottom: 12px; transition: color .2s; }
.p-body p { margin: 0; color: var(--muted); font-size: 0.97rem; max-width: 60ch; }
.p-go { grid-column: 10 / span 3; text-align: right; color: var(--ink); }
.p-go .ar { color: var(--blue); display: inline-block; transition: transform .25s var(--ease); }
.post:hover h3 { color: var(--blue); }
.post:hover .p-go .ar { transform: translate(3px, -3px); }
@media (max-width: 960px) {
  .post { grid-template-columns: 1fr; gap: 14px; padding: 28px 0; }
  .p-meta, .p-body, .p-go { grid-column: 1; padding-right: 0; text-align: left; }
  .p-meta { flex-direction: row; gap: 16px; }
}

/* ---------- Contact page ---------- */
.contact-grid { display: grid; grid-template-columns: repeat(12, 1fr); padding-bottom: 128px; }
.contact-grid .prose { grid-column: 1 / span 6; padding-top: 56px; }
.channels { grid-column: 8 / span 5; margin-top: 56px; align-self: start; background: var(--surface); border: 1px solid var(--ink); }
.channels .title { display: flex; justify-content: space-between; padding: 12px 18px; border-bottom: 1px solid var(--ink); color: var(--muted); }
.channels .title span:first-child { color: var(--ink); }
.channel { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 4px 16px; padding: 22px 18px; border-bottom: 1px solid var(--line); transition: background .2s; }
.channel:hover { background: var(--blue-soft); }
.channel b { font-size: 1.35rem; font-weight: 600; letter-spacing: -0.035em; }
.channel span.mono { grid-column: 1; color: var(--muted); text-transform: none; letter-spacing: 0.01em; font-size: 0.78rem; }
.channel .ar { grid-column: 2; grid-row: 1 / span 2; font-family: var(--mono); color: var(--blue); transition: transform .25s var(--ease); }
.channel:hover .ar { transform: translateX(4px); }
.channels .foot { display: flex; justify-content: space-between; padding: 14px 18px; color: var(--muted); }
@media (max-width: 960px) {
  .contact-grid { grid-template-columns: 1fr; padding-bottom: 88px; }
  .contact-grid .prose, .channels { grid-column: 1; }
  .contact-grid .prose { padding-top: 40px; }
  .channels { margin-top: 48px; }
}

/* ---------- 404 ---------- */
.lost { padding-bottom: 160px; }
.lost .big { display: block; font: 600 clamp(6rem, 20vw, 16rem)/0.85 var(--sans); letter-spacing: -0.07em; color: var(--blue); margin-bottom: 24px; }

/* ---------- Motion ---------- */
.reveal { transition: opacity .8s var(--ease), transform .8s var(--ease); transition-delay: calc(var(--d, 0) * 90ms); }
.js .reveal:not(.in) { opacity: 0; transform: translateY(16px); }
@media (prefers-reduced-motion: reduce) {
  .reveal, .js .reveal:not(.in), .js .stack.reveal:not(.in) .layer { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation: none !important; }
}

/* ---------- Utilities ---------- */
.skip-link {
  position: absolute;
  left: 12px; top: -60px;
  z-index: 100;
  padding: 10px 16px;
  background: var(--ink);
  color: #fff;
}
.skip-link:focus { top: 12px; }
.label { display: inline-block; }

@media print {
  .nav, .gridlines, .cta, footer, .skip-link { display: none; }
  .js .reveal:not(.in) { opacity: 1; transform: none; }
  body { background: #fff; }
}