/* ============================================================
   Habeeb — portfolio
   Two themes, one type system. No frameworks.
   Typography: Satoshi (sans) + JetBrains Mono (mono)
   Dark: near-black + cool accents.
   Light: warm paper (Archie-ish) + same accents, deepened.
   ============================================================ */

:root {
  color-scheme: dark;

  --bg: #08080a;
  --bg-soft: #0b0b0f;
  --panel: #0e0e13;
  --panel-hi: #121218;

  --line: rgba(255, 255, 255, 0.075);
  --line-hi: rgba(255, 255, 255, 0.16);

  --fg: #f3f3f6;
  --fg-dim: #a3a3b2;
  --fg-faint: #6d6d7c;

  --sky: #7dd3fc;
  --violet: #c4b5fd;
  --teal: #5eead4;
  --amber: #fcd34d;

  --grad: linear-gradient(100deg, var(--sky) 0%, var(--violet) 52%, #f0abfc 100%);
  --grad-a: linear-gradient(100deg, #7dd3fc, #a5b4fc);
  --grad-b: linear-gradient(100deg, #c4b5fd, #f0abfc);

  --invert-bg: #f4f4f7;
  --invert-bg-hover: #ffffff;
  --invert-fg: #08080a;

  --wash: rgba(255, 255, 255, 0.03);
  --wash-soft: rgba(255, 255, 255, 0.022);
  --wash-hover: rgba(255, 255, 255, 0.06);
  --card-grad: linear-gradient(180deg, rgba(255, 255, 255, 0.032), rgba(255, 255, 255, 0.008));
  --spot: rgba(125, 211, 252, 0.12);
  --spot-soft: rgba(125, 211, 252, 0.07);
  --card-shadow: 0 0 0 0 rgba(0, 0, 0, 0);

  --nav-bg: rgba(8, 8, 10, 0.72);
  --fade-radial: rgba(8, 8, 10, 0.86);
  --fade-top: rgba(8, 8, 10, 0.55);
  --fade-mid: rgba(8, 8, 10, 0.1);

  --grain-opacity: 0.035;
  --viz-opacity: 0.85;

  --body-wash:
    radial-gradient(900px 520px at 12% -8%, rgba(56, 130, 246, 0.11), transparent 62%),
    radial-gradient(760px 480px at 88% 4%, rgba(139, 92, 246, 0.1), transparent 60%),
    radial-gradient(900px 700px at 50% 108%, rgba(45, 212, 191, 0.05), transparent 62%);

  --viz-dot: rgba(180, 214, 255, 0.42);
  --viz-line: 148, 197, 255;
  --viz-box: rgba(125, 211, 252, 0.3);
  --viz-box-strong: rgba(125, 211, 252, 0.85);
  --viz-label: rgba(125, 211, 252, 0.82);
  --viz-label-bg: rgba(8, 8, 10, 0.72);
  --viz-cursor: rgba(196, 181, 253, 0.55);
  --viz-cursor-label: rgba(196, 181, 253, 0.9);

  --font: "Satoshi", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --radius: 16px;
  --container: 1120px;
  --nav-h: 64px;

  --ease: cubic-bezier(0.22, 0.8, 0.24, 1);
}

/* Warm paper — the default. `data-theme="dark"` is the opt-in override.
   Same fonts, same structure; warmer neutrals, deepened accents. */
:root:not([data-theme="dark"]) {
  color-scheme: light;

  --bg: #faf4e6;
  --bg-soft: #f4ecdb;
  --panel: #fffbf1;
  --panel-hi: #fffdf7;

  --line: rgba(72, 58, 34, 0.13);
  --line-hi: rgba(72, 58, 34, 0.3);

  --fg: #221d15;
  --fg-dim: #5d5344;
  --fg-faint: #6f6653;

  --sky: #0b62c4;
  --violet: #6d28d9;
  --teal: #0f766e;
  --amber: #8f5508;

  --grad: linear-gradient(100deg, #0b62c4 0%, #6d28d9 55%, #b45309 100%);
  --grad-a: linear-gradient(100deg, #0a58b3, #4338ca);
  --grad-b: linear-gradient(100deg, #6d28d9, #b45309);

  --invert-bg: #221d15;
  --invert-bg-hover: #000000;
  --invert-fg: #faf4e6;

  --wash: rgba(72, 58, 34, 0.04);
  --wash-soft: rgba(72, 58, 34, 0.03);
  --wash-hover: rgba(72, 58, 34, 0.08);
  --card-grad: linear-gradient(180deg, #fffdf7, #fdf8ec);
  --spot: rgba(11, 98, 196, 0.07);
  --spot-soft: rgba(11, 98, 196, 0.05);
  --card-shadow: 0 1px 2px rgba(94, 74, 38, 0.05), 0 16px 32px -24px rgba(94, 74, 38, 0.3);

  --nav-bg: rgba(250, 244, 230, 0.82);
  --fade-radial: rgba(250, 244, 230, 0.88);
  --fade-top: rgba(250, 244, 230, 0.62);
  --fade-mid: rgba(250, 244, 230, 0.12);

  --grain-opacity: 0.022;
  --viz-opacity: 0.55;

  --body-wash:
    radial-gradient(900px 520px at 12% -8%, rgba(202, 148, 44, 0.12), transparent 62%),
    radial-gradient(760px 480px at 88% 4%, rgba(124, 88, 158, 0.07), transparent 60%),
    radial-gradient(900px 700px at 50% 108%, rgba(90, 140, 120, 0.06), transparent 62%);

  --viz-dot: rgba(46, 84, 140, 0.34);
  --viz-line: 58, 96, 160;
  --viz-box: rgba(11, 98, 196, 0.26);
  --viz-box-strong: rgba(11, 98, 196, 0.7);
  --viz-label: rgba(11, 98, 196, 0.9);
  --viz-label-bg: rgba(250, 244, 230, 0.85);
  --viz-cursor: rgba(109, 40, 217, 0.42);
  --viz-cursor-label: rgba(109, 40, 217, 0.85);
}

*,
*::before,
*::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
  /* `clip` (not `hidden`) — `hidden` would turn body into a scroll container
     and stop the window from scrolling at all. */
  overflow-x: clip;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}

/* Ambient background wash */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background: var(--body-wash);
  pointer-events: none;
}

.grain {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: var(--grain-opacity);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}

::selection {
  background: rgba(125, 211, 252, 0.28);
  color: #fff;
}

img, svg { display: block; max-width: 100%; }

a { color: inherit; text-decoration: none; }

/* Touch: no 300 ms tap delay on phones. */
button, a, input, [role="button"] { touch-action: manipulation; }

h1, h2, h3, h4 {
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.12;
  margin: 0;
  text-wrap: balance;
}

p { margin: 0; text-wrap: pretty; }

ul, ol, dl, dd { margin: 0; padding: 0; list-style: none; }

:focus-visible {
  outline: 2px solid var(--sky);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}

/* ── Scroll progress ───────────────────────────────────────── */
.progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 60;
  background: transparent;
}
.progress span {
  display: block;
  height: 100%;
  width: 0;
  background: var(--grad);
  transition: width 0.1s linear;
}

/* ── Nav ───────────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  height: var(--nav-h);
  border-bottom: 1px solid transparent;
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease),
              backdrop-filter 0.35s var(--ease);
}
.nav.is-scrolled {
  background: var(--nav-bg);
  border-bottom-color: var(--line);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
}

.nav-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font);
  font-size: 16.5px;
  letter-spacing: -0.02em;
  color: var(--fg);
  font-weight: 600;
  text-decoration: none;
}
.brand-dot { color: var(--sky); }

.brand-logo {
  display: block;
  width: 28px;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 0 6px rgba(220, 38, 38, 0.45));
  transition: transform 0.25s var(--ease), filter 0.25s var(--ease);
}
.brand:hover .brand-logo {
  transform: scale(1.12);
  filter: drop-shadow(0 0 10px rgba(220, 38, 38, 0.75));
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
}
.nav-links a {
  position: relative;
  padding: 6px 12px;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--fg-dim);
  border-radius: 7px;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}
.nav-links a:hover { color: var(--fg); background: var(--wash-hover); }
.nav-links a.is-active { color: var(--fg); }
.nav-links a.is-active::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 1px;
  height: 1px;
  background: var(--grad);
}

.search-hint {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 10px;
  margin-left: 6px;
  background: var(--wash);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--fg-faint);
  font-family: var(--mono);
  font-size: 11px;
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}
.search-hint:hover { border-color: var(--line-hi); color: var(--fg-dim); }
.search-hint kbd { font-family: var(--mono); font-size: 11px; }

/* ── Theme toggle ──────────────────────────────────────────── */
.theme-toggle {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  margin-left: 4px;
  padding: 0;
  flex: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--wash);
  color: var(--fg-dim);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s, background 0.2s, transform 0.3s var(--ease);
}
.theme-toggle:hover {
  color: var(--fg);
  border-color: var(--line-hi);
  background: var(--wash-hover);
}
.theme-toggle:active { transform: scale(0.94); }
.theme-toggle svg { grid-area: 1 / 1; pointer-events: none; }
.theme-toggle .icon-sun {
  opacity: 0;
  transform: rotate(-45deg) scale(0.6);
  transition: opacity 0.25s, transform 0.35s var(--ease);
}
.theme-toggle .icon-moon {
  opacity: 1;
  transform: none;
  transition: opacity 0.25s, transform 0.35s var(--ease);
}
:root:not([data-theme="dark"]) .theme-toggle .icon-sun { opacity: 1; transform: none; }
:root:not([data-theme="dark"]) .theme-toggle .icon-moon { opacity: 0; transform: rotate(45deg) scale(0.6); }

/* ── Hero ──────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 60px) 0 96px;
  overflow: hidden;
}

#viz {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: var(--viz-opacity);
  transition: opacity 0.4s var(--ease);
}

.hero-fade {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(700px 420px at 18% 40%, var(--fade-radial), transparent 72%),
    linear-gradient(180deg, var(--fade-top) 0%, var(--fade-mid) 35%, var(--bg) 96%);
}

/* The hero copy keeps the full container. The brain map sits
   next to the main headline, faded, and expands on hover. */
.hero-inner {
  position: relative;
  z-index: 2;
}

.hero-headline-wrap {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 26px;
}
.hero-headline-wrap h1 {
  margin: 0;
  flex: 1 1 auto;
}

.brain-panel {
  position: relative;
  flex: 0 0 clamp(270px, 25vw, 310px);
  width: clamp(270px, 25vw, 310px);
  padding: 12px 12px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 90% at 20% 0%, var(--spot-soft), transparent 62%),
    var(--card-grad),
    var(--panel);
  overflow: hidden;
  opacity: 0.40;
  transition: opacity 0.3s var(--ease), border-color 0.3s var(--ease), transform 0.3s var(--ease);
  z-index: 3;
}
.brain-panel:hover,
.brain-panel:focus-within {
  opacity: 0.95;
  border-color: var(--line-hi);
  transform: translateY(-2px);
}

.brain-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--fg-dim);
}
.brain-title { display: inline-flex; align-items: center; gap: 7px; }
.brain-meta { color: var(--fg-faint); letter-spacing: 0.06em; font-size: 9.5px; }

.brain-canvas-wrap {
  position: relative;
  margin-top: 10px;
  aspect-ratio: 1 / 1;
}
#brainCanvas {
  display: block;
  width: 100%;
  height: 100%;
  /* A finger can still scroll the page; dragging a node takes over
     once the gesture starts on the graph. */
  touch-action: pan-y;
}

.brain-hint {
  display: flex;
  gap: 10px;
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.05em;
  color: var(--fg-faint);
}
.brain-hint-touch { display: none; }

.eyebrow {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-dim);
  margin-bottom: 26px;
}
.eyebrow .sep { color: var(--fg-faint); }

.pulse {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 0 rgba(94, 234, 212, 0.5);
  animation: pulse 2.6s infinite;
  flex: none;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(94, 234, 212, 0.45); }
  65%  { box-shadow: 0 0 0 9px rgba(94, 234, 212, 0); }
  100% { box-shadow: 0 0 0 0 rgba(94, 234, 212, 0); }
}

.hero h1 {
  font-size: clamp(2.55rem, 7.1vw, 5.1rem);
  font-weight: 600;
  letter-spacing: -0.045em;
  line-height: 0.99;
  margin: 0 0 26px;
  max-width: 15ch;
}
.hero h1 em {
  font-style: normal;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.grad-a { background: var(--grad-a) !important; -webkit-background-clip: text !important; background-clip: text !important; color: transparent; }
.grad-b { background: var(--grad-b) !important; -webkit-background-clip: text !important; background-clip: text !important; color: transparent; }

/* ── Interactive H1 Words ("see" -> blinking eye, "reason" -> brain) ── */
.h1-interactive {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: crosshair;
  vertical-align: baseline;
  padding: 0 4px;
}

.h1-interactive .word-text {
  display: inline-block;
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
}

.h1-interactive .word-icon {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: scale(0.65);
  pointer-events: none;
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease);
}

.h1-interactive:hover .word-text,
.h1-interactive.is-active .word-text {
  opacity: 0;
  transform: scale(0.65);
}

.h1-interactive:hover .word-icon,
.h1-interactive.is-active .word-icon {
  opacity: 1;
  transform: scale(1);
}

/* Bounding box reticle around the word */
.h1-interactive::before {
  content: "";
  position: absolute;
  inset: -3px -6px;
  border: 1.5px solid var(--sky);
  border-radius: 4px;
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
  pointer-events: none;
}
.h1-interactive::after {
  content: "see 0.99";
  position: absolute;
  bottom: calc(100% + 4px);
  left: -6px;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  padding: 2px 6px;
  background: var(--bg);
  border: 1px solid var(--sky);
  color: var(--sky);
  border-radius: 4px;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease);
  pointer-events: none;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

#wordSee { color: var(--sky); }
#wordSee::before { border-color: var(--sky); }
#wordSee::after {
  content: "see 0.99";
  border-color: var(--sky);
  color: var(--sky);
}

#wordReason { color: var(--violet); }
#wordReason::before { border-color: var(--violet); }
#wordReason::after {
  content: "reason 0.99";
  border-color: var(--violet);
  color: var(--violet);
}

.h1-interactive:hover::before,
.h1-interactive.is-active::before {
  opacity: 1;
  transform: scale(1);
}
.h1-interactive:hover::after,
.h1-interactive.is-active::after {
  opacity: 1;
  transform: translateY(0);
}

/* Eye Blinking Animation */
@keyframes eyeBlink {
  0%, 82%, 100% {
    transform: scaleY(1);
  }
  86%, 92% {
    transform: scaleY(0.08);
  }
}
.h1-eye-svg {
  color: var(--sky);
  filter: drop-shadow(0 0 8px rgba(125, 211, 252, 0.5));
  animation: eyeBlink 2.6s infinite ease-in-out;
  transform-origin: center;
}

/* Brain Pulse Animation */
@keyframes brainPulse {
  0%, 100% {
    transform: scale(1);
    filter: drop-shadow(0 0 5px rgba(196, 181, 253, 0.4));
  }
  50% {
    transform: scale(1.1);
    filter: drop-shadow(0 0 12px rgba(196, 181, 253, 0.8));
  }
}
.h1-brain-svg {
  color: var(--violet);
  animation: brainPulse 2s infinite ease-in-out;
  transform-origin: center;
}

.intro-wrap {
  display: flex;
  align-items: flex-start;
  gap: 26px;
  max-width: 72ch;
  margin-bottom: 34px;
}

.intro-avatar {
  position: relative;
  flex: none;
  width: 96px;
  height: 96px;
  border-radius: 18px;
  margin-top: 4px;
}
.intro-avatar-inner {
  width: 100%;
  height: 100%;
  border-radius: 18px;
  overflow: hidden;
  border: 1.5px solid var(--line-hi);
  background: var(--panel);
  box-shadow: 0 12px 28px -8px rgba(0, 0, 0, 0.35);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}
.intro-avatar img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s var(--ease);
}
.intro-avatar:hover .intro-avatar-inner {
  transform: translateY(-2px);
  border-color: var(--sky);
}
.intro-avatar:hover img {
  transform: scale(1.06);
}
.intro-avatar .avatar-tag {
  position: absolute;
  top: -10px;
  right: -8px;
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 500;
  padding: 2px 6px;
  background: var(--bg);
  border: 1px solid var(--sky);
  color: var(--sky);
  border-radius: 4px;
  white-space: nowrap;
  letter-spacing: 0.04em;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  z-index: 2;
}
.intro-avatar-corners {
  position: absolute;
  inset: -3px;
  pointer-events: none;
  z-index: 1;
}
.intro-avatar-corners::before,
.intro-avatar-corners::after {
  content: "";
  position: absolute;
  width: 8px;
  height: 8px;
  border: 1.5px solid var(--sky);
}
.intro-avatar-corners::before { top: 0; left: 0; border-right: 0; border-bottom: 0; }
.intro-avatar-corners::after { bottom: 0; right: 0; border-left: 0; border-top: 0; }

.intro-wrap .lede {
  margin-bottom: 0;
  max-width: 58ch;
}

@media (max-width: 640px) {
  .intro-wrap {
    flex-direction: column;
    gap: 18px;
  }
}

.lede {
  font-size: clamp(1rem, 1.35vw, 1.125rem);
  line-height: 1.72;
  color: var(--fg-dim);
  max-width: 57ch;
  margin-bottom: 34px;
}
.lede .hl { color: var(--fg); }

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 56px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border-radius: 999px;
  border: 1px solid var(--line-hi);
  background: var(--wash);
  color: var(--fg);
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.01em;
  cursor: pointer;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease),
              border-color 0.25s var(--ease), color 0.25s var(--ease);
}
.btn:hover {
  transform: translateY(-1px);
  border-color: var(--line-hi);
  background: var(--wash-hover);
}
.btn-primary {
  background: var(--invert-bg);
  color: var(--invert-fg);
  border-color: var(--invert-bg);
}
.btn-primary:hover { background: var(--invert-bg-hover); color: var(--invert-fg); border-color: var(--invert-bg-hover); }
.btn-quiet { border-color: var(--line); color: var(--fg-dim); }
.btn-quiet:hover { color: var(--fg); }

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-top: 1px solid var(--line);
  padding-top: 22px;
  max-width: 620px;
}
.stats > div {
  padding-right: 34px;
  margin-right: 34px;
  border-right: 1px solid var(--line);
}
.stats > div:last-child { border-right: 0; margin-right: 0; padding-right: 0; }
.stats dt {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 4px;
}
.stats dd {
  font-size: 19px;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--fg);
}

.scroll-cue {
  position: absolute;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  z-index: 2;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-faint);
  transition: color 0.25s;
}
.scroll-cue:hover { color: var(--fg-dim); }
.scroll-cue svg { animation: cue 2.4s var(--ease) infinite; }
@keyframes cue {
  0%, 100% { transform: translateY(0); opacity: 0.5; }
  50% { transform: translateY(5px); opacity: 1; }
}

/* ── Sections ──────────────────────────────────────────────── */
.section {
  position: relative;
  padding: 104px 0;
  scroll-margin-top: calc(var(--nav-h) + 8px);
}
.section + .section { border-top: 1px solid var(--line); }
.section-last { padding-bottom: 120px; }

.section-head { margin-bottom: 40px; max-width: 62ch; }

.label {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 16px;
}
.label-line {
  width: 26px;
  height: 1px;
  background: linear-gradient(90deg, var(--sky), transparent);
  flex: none;
}

.section h2 {
  font-size: clamp(1.7rem, 3.3vw, 2.5rem);
  letter-spacing: -0.035em;
  margin-bottom: 12px;
}

.section-sub {
  color: var(--fg-dim);
  font-size: 15.5px;
  line-height: 1.65;
  margin-top: 12px;
}

.inline-link {
  color: var(--fg);
  border-bottom: 1px solid color-mix(in srgb, var(--sky) 45%, transparent);
  transition: border-color 0.2s, color 0.2s;
}
.inline-link:hover { border-color: var(--sky); color: var(--sky); }

/* ── Cards ─────────────────────────────────────────────────── */
.card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card-grad);
  box-shadow: var(--card-shadow);
  transition: transform 0.4s var(--ease), border-color 0.4s var(--ease),
              background 0.4s var(--ease);
  isolation: isolate;
}
.card::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0;
  background: radial-gradient(300px circle at var(--mx, 50%) var(--my, 50%),
              var(--spot), transparent 72%);
  transition: opacity 0.35s var(--ease);
  pointer-events: none;
}
.card:hover { border-color: var(--line-hi); background: var(--panel-hi); }
.card:hover::before { opacity: 1; }

/* ── Focus ─────────────────────────────────────────────────── */
.focus-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
  gap: 16px;
}

.focus-card { padding: 26px 26px 24px; }
.focus-card:hover { transform: translateY(-3px); }

.focus-icon {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--wash);
  color: var(--sky);
  margin-bottom: 18px;
}

.focus-card h3 {
  font-size: 17.5px;
  letter-spacing: -0.02em;
  margin-bottom: 9px;
}
.focus-card p {
  color: var(--fg-dim);
  font-size: 14.5px;
  line-height: 1.65;
}

.mini-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 18px;
}
.mini-tags li {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-faint);
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: 5px;
}

/* ── Focus Interactive Cards with Hover Animations ── */
.focus-card-interactive {
  position: relative;
  overflow: hidden;
  min-height: 290px;
}

.focus-card-interactive .card-content {
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
}

.focus-card-interactive .card-anim {
  position: absolute;
  inset: 0;
  opacity: 0;
  pointer-events: none;
  transform: scale(0.96);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
  overflow: hidden;
  border-radius: inherit;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 22px 24px;
  background: var(--panel-hi);
  z-index: 2;
}

.focus-card-interactive:hover .card-content {
  opacity: 0;
  transform: scale(0.95);
  pointer-events: none;
}

.focus-card-interactive:hover .card-anim {
  opacity: 1;
  transform: scale(1);
  pointer-events: auto;
}

/* Common Anim Header & Footer */
.anim-head, .anim-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.anim-head { margin-bottom: 12px; }
.anim-foot {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  color: var(--fg-faint);
  font-size: 9.5px;
}
.anim-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--fg);
  font-weight: 600;
}
.anim-telemetry { color: var(--fg-dim); }

/* ── 1. Computer Vision Detection Animation ── */
.cv-viewport {
  position: relative;
  flex: 1;
  min-height: 140px;
  border: 1px dashed var(--line);
  border-radius: 8px;
  background: var(--wash-soft);
  overflow: hidden;
}
.cv-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 20px 20px;
  opacity: 0.5;
}
@keyframes scanSweep {
  0% { top: 0%; opacity: 0; }
  15% { opacity: 1; }
  85% { opacity: 1; }
  100% { top: 100%; opacity: 0; }
}
.cv-scanline {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--sky), transparent);
  box-shadow: 0 0 8px var(--sky);
  animation: scanSweep 2.2s infinite ease-in-out;
}
.cv-box {
  position: absolute;
  border: 1.5px solid var(--sky);
  border-radius: 2px;
  transition: transform 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(125, 211, 252, 0.05);
}
.cv-obj-svg {
  width: 90%;
  height: 90%;
  display: block;
}
.cv-box .cv-tag {
  position: absolute;
  top: -16px;
  left: -1px;
  font-family: var(--mono);
  font-size: 8.5px;
  background: var(--bg);
  border: 1px solid var(--sky);
  color: var(--sky);
  padding: 1px 4px;
  border-radius: 2px;
  white-space: nowrap;
}
.cv-box .cv-reticle {
  position: absolute;
  width: 5px;
  height: 5px;
  border: 1.5px solid var(--sky);
}
.cv-reticle.tl { top: -2px; left: -2px; border-right: 0; border-bottom: 0; }
.cv-reticle.tr { top: -2px; right: -2px; border-left: 0; border-bottom: 0; }
.cv-reticle.bl { bottom: -2px; left: -2px; border-right: 0; border-top: 0; }
.cv-reticle.br { bottom: -2px; right: -2px; border-left: 0; border-top: 0; }

@keyframes boxJitter1 {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(2px, -3px); }
}
@keyframes boxJitter2 {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-3px, 2px); }
}
@keyframes boxJitter3 {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(1px, 2px); }
}
.cv-person {
  left: 10%;
  top: 18%;
  width: 44px;
  height: 72px;
  animation: boxJitter1 3s infinite ease-in-out;
}
.cv-skel {
  width: 100%;
  height: 100%;
  stroke: var(--sky);
  fill: none;
  stroke-width: 1.6;
  opacity: 0.85;
}
.cv-vehicle {
  left: 38%;
  top: 22%;
  width: 78px;
  height: 46px;
  border-color: var(--teal);
  background: rgba(94, 234, 212, 0.06);
  color: var(--teal);
  animation: boxJitter2 3.5s infinite ease-in-out;
}
.cv-vehicle .cv-tag, .cv-vehicle .cv-reticle {
  border-color: var(--teal);
  color: var(--teal);
}
.cv-cat {
  right: 8%;
  bottom: 12%;
  width: 42px;
  height: 40px;
  border-color: var(--amber);
  background: rgba(252, 211, 77, 0.06);
  color: var(--amber);
  animation: boxJitter3 2.8s infinite ease-in-out;
}
.cv-cat .cv-tag, .cv-cat .cv-reticle {
  border-color: var(--amber);
  color: var(--amber);
}

/* ── 2. Vision-Language Models Animation ── */
.vlm-viewport {
  position: relative;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  border: 1px dashed var(--line);
  border-radius: 8px;
  background: var(--wash-soft);
  padding: 10px 14px;
  overflow: hidden;
}
.vlm-patches {
  display: flex;
  justify-content: center;
  gap: 6px;
}
.vlm-patch {
  width: 32px;
  height: 22px;
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 4px;
  transition: border-color 0.3s;
}
.vlm-patch.active {
  border-color: var(--violet);
  background: color-mix(in srgb, var(--violet) 18%, transparent);
  box-shadow: 0 0 8px color-mix(in srgb, var(--violet) 35%, transparent);
}
.vlm-connector {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 2px 0;
}
.vlm-rays {
  width: 100%;
  height: 26px;
}
@keyframes rayDash {
  to { stroke-dashoffset: -20; }
}
.ray-line {
  stroke: var(--violet);
  stroke-width: 1.5;
  stroke-dasharray: 4 3;
  fill: none;
  animation: rayDash 1s infinite linear;
}
.ray-line.r1 { animation-delay: 0s; }
.ray-line.r2 { animation-delay: 0.3s; }
.ray-line.r3 { animation-delay: 0.6s; }
.vlm-cross-attn {
  font-family: var(--mono);
  font-size: 8.5px;
  color: var(--violet);
  letter-spacing: 0.08em;
}
.vlm-tokens {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
}
.vlm-tok {
  font-family: var(--mono);
  font-size: 9.5px;
  padding: 3px 7px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--fg-dim);
}
.vlm-tok.hl {
  border-color: var(--violet);
  color: var(--fg);
  background: color-mix(in srgb, var(--violet) 16%, transparent);
  font-weight: 600;
}

/* ── 3. Post-Training Animation ── */
.post-viewport {
  position: relative;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  border: 1px dashed var(--line);
  border-radius: 8px;
  background: var(--wash-soft);
  padding: 10px 14px;
  overflow: hidden;
}
.post-pairs {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.post-pair {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 4px 10px;
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 9.5px;
  font-weight: 500;
}
.post-pair.chosen {
  background: rgba(94, 234, 212, 0.1);
  border: 1px solid var(--teal);
  color: var(--teal);
}
.post-pair.rejected {
  background: rgba(244, 63, 94, 0.1);
  border: 1px solid rgba(244, 63, 94, 0.6);
  color: #f43f5e;
}
.post-chart {
  position: relative;
  margin-top: 4px;
}
.post-svg {
  width: 100%;
  height: 44px;
  overflow: visible;
}
.chart-loss {
  fill: none;
  stroke: #f43f5e;
  stroke-width: 1.8;
}
.chart-reward {
  fill: none;
  stroke: var(--teal);
  stroke-width: 2;
  filter: drop-shadow(0 0 4px var(--teal));
}
@keyframes pulseDot {
  0%, 100% { r: 3.2; opacity: 1; }
  50% { r: 4.8; opacity: 0.7; }
}
.chart-dot {
  fill: var(--teal);
  animation: pulseDot 1.4s infinite ease-in-out;
}
.chart-legend {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 9px;
  margin-top: 4px;
}
.leg-loss { color: #f43f5e; }
.leg-reward { color: var(--teal); }

/* ── Experience ────────────────────────────────────────────── */
.timeline {
  position: relative;
  margin-left: 5px;
  border-left: 1px solid var(--line);
}

.timeline-item {
  position: relative;
  padding: 0 0 36px 28px;
}
.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 6px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--bg);
  border: 1.5px solid var(--sky);
}

.timeline-when {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 9px;
}

.when-now {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--teal);
}
.dot-live {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--teal);
}

.timeline-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 6px;
}
.timeline-head h3 { margin-bottom: 3px; }
.timeline-head .timeline-org { margin-bottom: 0; }

.org-logo {
  flex: none;
  width: 44px;
  height: 44px;
  border-radius: 11px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #ffffff;
  box-shadow: var(--card-shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3px;
}
.org-logo img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.timeline-body h3 {
  font-size: 19px;
  letter-spacing: -0.025em;
  margin-bottom: 5px;
}

.timeline-org {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--fg-dim);
  margin-bottom: 13px;
}
.timeline-org .sep { color: var(--fg-faint); }

.bullets {
  display: grid;
  gap: 8px;
  max-width: 78ch;
}
.bullets li {
  position: relative;
  padding-left: 16px;
  color: var(--fg-dim);
  font-size: 14.5px;
  line-height: 1.62;
}
.bullets li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 5px;
  height: 1px;
  background: var(--fg-faint);
}

.toolkit-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
  gap: 16px;
  margin-top: 48px;
  padding-top: 36px;
  border-top: 1px solid var(--line);
}

.toolkit-card {
  padding: 26px 26px 24px;
}
.toolkit-card:hover { transform: translateY(-3px); }

.toolkit-card h3 {
  font-size: 17.5px;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  color: var(--fg);
}

.toolkit-card .mini-tags {
  margin-top: 0;
}


/* ── Chips ─────────────────────────────────────────────────── */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-bottom: 26px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--fg-dim);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease),
              background 0.2s var(--ease);
}
.chip:hover { color: var(--fg); border-color: var(--line-hi); }
.chip.is-active {
  background: var(--fg);
  border-color: var(--fg);
  color: var(--bg);
}
.chip-count { opacity: 0.55; font-size: 10px; }
.chips-sm .chip { padding: 5px 11px; font-size: 11px; }

/* ── Work ──────────────────────────────────────────────────── */
.work-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(310px, 100%), 1fr));
  gap: 14px;
}

.work-card {
  display: flex;
  flex-direction: column;
  padding: 22px;
  min-height: 214px;
}
.work-card:hover { transform: translateY(-3px); }

.work-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
}
.tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--sky);
  padding: 3px 8px;
  border-radius: 5px;
  background: color-mix(in srgb, var(--sky) 11%, transparent);
  border: 1px solid color-mix(in srgb, var(--sky) 26%, transparent);
  white-space: nowrap;
}
.work-card[data-cat="multimodal"] .tag {
  color: var(--violet);
  background: color-mix(in srgb, var(--violet) 11%, transparent);
  border-color: color-mix(in srgb, var(--violet) 26%, transparent);
}
.work-card[data-cat="post-training"] .tag {
  color: var(--teal);
  background: color-mix(in srgb, var(--teal) 11%, transparent);
  border-color: color-mix(in srgb, var(--teal) 26%, transparent);
}
.work-card[data-cat="systems"] .tag {
  color: var(--amber);
  background: color-mix(in srgb, var(--amber) 11%, transparent);
  border-color: color-mix(in srgb, var(--amber) 26%, transparent);
}

.ext {
  color: var(--fg-faint);
  opacity: 0;
  transform: translate(-3px, 3px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease), color 0.3s;
  flex: none;
}
.work-card:hover .ext,
.article-card:hover .ext {
  opacity: 1;
  transform: none;
  color: var(--fg);
}

.work-card h3 {
  font-size: 19px;
  letter-spacing: -0.025em;
  margin-bottom: 9px;
}
.work-card p {
  color: var(--fg-dim);
  font-size: 14px;
  line-height: 1.62;
  margin-bottom: 18px;
}

.work-foot {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--fg-faint);
  letter-spacing: 0.02em;
}
.work-foot span { position: relative; }
.work-foot span + span::before {
  content: "·";
  position: absolute;
  left: -9px;
  color: var(--fg-faint);
  opacity: 0.6;
}

.work-card.is-hidden { display: none; }

.more-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 28px;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--fg-dim);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.25s, border-color 0.25s;
}
.more-link:hover { color: var(--fg); border-bottom-color: var(--line-hi); }

.grid-empty {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--fg-faint);
  padding: 30px 0;
}

/* ── Writing ───────────────────────────────────────────────── */
.writing-tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.search-wrap {
  position: relative;
  display: flex;
  align-items: center;
  gap: 9px;
  flex: 1 1 260px;
  max-width: 340px;
  padding: 0 11px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--wash-soft);
  color: var(--fg-faint);
  transition: border-color 0.2s;
}
.search-wrap:focus-within {
  border-color: rgba(125, 211, 252, 0.5);
  color: var(--sky);
}
.search-wrap input {
  flex: 1;
  min-width: 0;
  /* Fill the 38 px (44 px on phones) shell so the whole pill is tappable. */
  height: 100%;
  background: none;
  border: 0;
  outline: none;
  color: var(--fg);
  font-family: var(--font);
  font-size: 13.5px;
}
.search-wrap input::placeholder { color: var(--fg-faint); }
.search-wrap input::-webkit-search-cancel-button { filter: invert(0.6); }
.search-kbd {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--fg-faint);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 5px;
}

.post-list {
  border-top: 1px solid var(--line);
}

.post-row { border-bottom: 1px solid var(--line); }

.post-link {
  display: grid;
  grid-template-columns: 104px 1fr 28px;
  align-items: baseline;
  gap: 16px;
  padding: 14px 8px 14px 0;
  transition: background 0.22s var(--ease), padding-left 0.22s var(--ease);
  border-radius: 6px;
}
.post-link:hover { background: var(--wash-soft); padding-left: 10px; }

.post-date {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-faint);
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.post-title {
  font-size: 15.5px;
  color: var(--fg-dim);
  letter-spacing: -0.012em;
  transition: color 0.22s;
}
.post-link:hover .post-title { color: var(--fg); }

.post-arrow {
  justify-self: end;
  color: var(--fg-faint);
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease), color 0.25s;
}
.post-link:hover .post-arrow { opacity: 1; transform: none; color: var(--sky); }

.post-row.is-hidden { display: none; }

.post-badge {
  display: inline-block;
  margin-left: 9px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-faint);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 5px;
  vertical-align: 1px;
}

.show-more { margin-top: 26px; }
.show-more[hidden] { display: none; }

/* ── Articles ──────────────────────────────────────────────── */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(290px, 100%), 1fr));
  gap: 14px;
}

.article-card {
  display: flex;
  flex-direction: column;
  padding: 22px;
  min-height: 186px;
}
.article-card:hover { transform: translateY(-3px); }

.article-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
}
.badge {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-dim);
  border: 1px solid var(--line-hi);
  border-radius: 5px;
  padding: 2px 7px;
}
.article-top time {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--fg-faint);
}

.article-card h3 {
  font-size: 17px;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.article-card p {
  color: var(--fg-dim);
  font-size: 13.5px;
  line-height: 1.6;
}

.read {
  margin-top: auto;
  padding-top: 16px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--fg-faint);
  transition: color 0.22s;
}
.article-card:hover .read { color: var(--sky); }

/* ── Notes ─────────────────────────────────────────────────── */
.notes-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background:
    radial-gradient(600px 200px at 0% 0%, var(--spot-soft), transparent 70%),
    var(--card-grad);
  box-shadow: var(--card-shadow);
  transition: border-color 0.35s var(--ease), transform 0.35s var(--ease);
}
.notes-card:hover { border-color: var(--line-hi); transform: translateY(-2px); }

.notes-left {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}
.notes-glyph {
  flex: none;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--wash);
  color: var(--sky);
}
.notes-card h3 {
  font-size: 19px;
  letter-spacing: -0.025em;
  margin-bottom: 8px;
}
.notes-card p {
  color: var(--fg-dim);
  font-size: 14.5px;
  line-height: 1.62;
  max-width: 62ch;
}

.notes-action {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--fg-dim);
  white-space: nowrap;
  transition: color 0.22s;
}
.notes-card:hover .notes-action { color: var(--sky); }

/* ── Contact ───────────────────────────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(255px, 100%), 1fr));
  gap: 14px;
}

.contact-tile {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card-grad);
  box-shadow: var(--card-shadow);
  text-align: left;
  font-family: inherit;
  color: inherit;
  cursor: pointer;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease),
              background 0.3s var(--ease);
}
.contact-tile { cursor: pointer; }
.contact-tile:hover {
  border-color: var(--line-hi);
  transform: translateY(-2px);
  background: var(--panel-hi);
}

.contact-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-faint);
}
.contact-value {
  font-size: 16.5px;
  letter-spacing: -0.02em;
  color: var(--fg);
  word-break: break-word;
}
.contact-hint {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-faint);
  margin-top: 3px;
}
.contact-tile:hover .contact-hint { color: var(--sky); }

/* ── Article pages (writing/<slug>/) ───────────────────────── */
.post-main {
  padding: calc(var(--nav-h) + 56px) 0 104px;
}
.post-page {
  width: 100%;
  max-width: 748px;
  margin-inline: auto;
  padding-inline: 24px;
}

.post-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--fg-faint);
  margin-bottom: 26px;
  transition: color 0.2s;
}
.post-back:hover { color: var(--fg); }

.post-head h1 {
  font-size: clamp(1.85rem, 4.6vw, 2.9rem);
  letter-spacing: -0.035em;
  line-height: 1.1;
  margin-bottom: 16px;
}
.post-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--fg-faint);
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 38px;
}
.post-meta .sep { opacity: 0.6; }

/* Article body — the site reset strips list markers and spacing, so the
   prose scope puts the typography back for imported and hand-written HTML. */
.prose {
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--fg-dim);
}
.prose p { margin: 0 0 1.25em; }
.prose ul,
.prose ol { margin: 0 0 1.35em; padding-left: 1.35em; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: 0.45em; }
.prose li::marker { color: var(--fg-faint); }
.prose li > ul,
.prose li > ol { margin: 0.45em 0 0; }
.prose h2 {
  margin: 2.1em 0 0.6em;
  font-size: 1.5rem;
  letter-spacing: -0.025em;
  line-height: 1.2;
  color: var(--fg);
}
.prose h3 {
  margin: 1.9em 0 0.5em;
  font-size: 1.18rem;
  line-height: 1.28;
  color: var(--fg);
}
.prose h4 {
  margin: 1.7em 0 0.45em;
  font-size: 1.02rem;
  line-height: 1.35;
  color: var(--fg);
}
.prose h5,
.prose h6 {
  margin: 1.6em 0 0.4em;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg);
}
.prose h2:first-child,
.prose h3:first-child,
.prose h4:first-child { margin-top: 0; }
.prose a {
  color: var(--fg);
  border-bottom: 1px solid color-mix(in srgb, var(--sky) 45%, transparent);
  transition: color 0.2s, border-color 0.2s;
}
.prose a:hover { color: var(--sky); border-color: var(--sky); }
.prose strong { color: var(--fg); font-weight: 600; }
.prose blockquote {
  margin: 1.8em 0;
  padding: 4px 0 4px 18px;
  border-left: 2px solid var(--sky);
  font-style: italic;
}
.prose blockquote p:last-child { margin-bottom: 0; }
.prose hr {
  margin: 2.4em 0;
  border: 0;
  border-top: 1px solid var(--line);
}
.prose img {
  height: auto;
  margin: 1.9em auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--wash);
}
.prose figure { margin: 1.9em 0; }
.prose figcaption {
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-faint);
  text-align: center;
}
.prose code {
  font-family: var(--mono);
  font-size: 0.86em;
  padding: 0.1em 0.35em;
  background: var(--wash);
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--fg);
  overflow-wrap: break-word;
}
.prose pre {
  margin: 1.6em 0;
  padding: 16px 18px;
  background: var(--wash-soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow-x: auto;
  font-size: 12.5px;
  line-height: 1.65;
  -webkit-overflow-scrolling: touch;
}
.prose pre code {
  padding: 0;
  background: none;
  border: 0;
  border-radius: 0;
  font-size: inherit;
  color: var(--fg-dim);
}

/* Wide tables scroll rather than push the page sideways. */
.table-wrap {
  margin: 1.7em 0;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  -webkit-overflow-scrolling: touch;
}
.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}
.prose th,
.prose td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}
.prose th {
  background: var(--wash);
  color: var(--fg);
  font-weight: 600;
  white-space: nowrap;
}
.prose tr:last-child td { border-bottom: 0; }

/* Maths. KaTeX turns $…$ into plain HTML at build time, so there is no
   client-side renderer — these rules only handle rhythm and overflow. */
.prose .math-block {
  margin: 1.7em 0;
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 2px;
}
.prose .katex-display { margin: 0; }
.prose .math-block-inline {
  display: inline-block;
  max-width: 100%;
  vertical-align: middle;
}
.prose .katex { font-size: 1.04em; }
.prose .math-error {
  color: #b91c1c;
  font-size: 0.9em;
}

.post-pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 64px;
  padding-top: 30px;
  border-top: 1px solid var(--line);
}
.pager-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card-grad);
  box-shadow: var(--card-shadow);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease),
              transform 0.25s var(--ease);
}
.pager-link:hover {
  border-color: var(--line-hi);
  background: var(--panel-hi);
  transform: translateY(-2px);
}
.pager-dir {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-faint);
}
.pager-title {
  font-size: 15px;
  letter-spacing: -0.015em;
  color: var(--fg);
}
.pager-next { text-align: right; }

/* ── Footer ────────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--line);
  padding: 26px 0;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--fg-faint);
}
.footer-top { transition: color 0.22s; }
.footer-top:hover { color: var(--fg); }

/* ── Reveal ────────────────────────────────────────────────── */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.75s var(--ease), transform 0.75s var(--ease);
  transition-delay: calc(var(--i, 0) * 55ms);
}
[data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ── Theme switch ──────────────────────────────────────────── */
/* Fallback for engines without View Transitions: cross-fade the
   colour-bearing properties for the duration of the swap. */
html.is-theming,
html.is-theming *,
html.is-theming *::before,
html.is-theming *::after {
  transition:
    background-color 0.42s var(--ease),
    color 0.42s var(--ease),
    border-color 0.42s var(--ease),
    box-shadow 0.42s var(--ease),
    fill 0.42s var(--ease),
    stroke 0.42s var(--ease) !important;
}

@media (prefers-reduced-motion: no-preference) {
  ::view-transition-old(root),
  ::view-transition-new(root) {
    animation-duration: 0.42s;
    animation-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  }
}

@media (prefers-reduced-motion: reduce) {
  ::view-transition-group(*),
  ::view-transition-old(*),
  ::view-transition-new(*) {
    animation: none !important;
  }
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 860px) {
  .hero-headline-wrap {
    display: block;
  }
  .hero-headline-wrap h1 {
    margin-bottom: 24px;
  }
  .brain-panel {
    display: none;
  }

  /* Keep navigation reachable on phones: scrollable, no wrapper chrome. */
  .nav-links {
    display: flex;
    margin-left: auto;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    -webkit-overflow-scrolling: touch;
  }
  .nav-links::-webkit-scrollbar { display: none; }
  .nav-links a {
    display: inline-flex;
    align-items: center;
    min-height: 40px;
    padding: 0 10px;
    font-size: 13px;
    white-space: nowrap;
  }
  .nav-links a.is-active::after { left: 10px; right: 10px; }
  .brand { min-height: 40px; }
  .theme-toggle { width: 40px; height: 40px; }
  .search-hint { display: none; }
  /* Finger-sized controls for anything tablet-width and below. */
  .search-wrap { height: 44px; }
  .search-wrap input { font-size: 16px; }
  .chips-sm .chip { min-height: 38px; padding: 8px 14px; font-size: 12px; }
  .more-link { padding-block: 10px; }
  .footer-top { padding-block: 10px; }
  .section { padding: 78px 0; }
  .notes-card { flex-direction: column; align-items: flex-start; gap: 20px; }
  .notes-action { padding-left: 64px; }
  .post-link { grid-template-columns: 84px 1fr 22px; gap: 12px; }
  .post-title { font-size: 14.5px; }
  .stats > div { padding-right: 22px; margin-right: 22px; }
  .timeline-item { padding-left: 20px; }
  .toolkit-grid { gap: 12px; margin-top: 34px; }
}

@media (max-width: 620px) {
  /* Too many sections to fit beside the brand on a phone, so the links get
     their own full-width row — scrollable, but 2.5× the strip width the
     single-row header had at this size. */
  :root { --nav-h: 96px; }
  .nav { height: auto; }
  .nav-inner {
    flex-wrap: wrap;
    align-items: center;
    gap: 0;
    padding-block: 7px 5px;
  }
  .brand { order: 1; }
  .theme-toggle { order: 2; margin-left: auto; }
  .nav-links {
    order: 3;
    flex: 1 0 100%;
    margin: 2px -10px 0;
    scroll-snap-type: x proximity;
    /* Fades the clipped edge so a half-visible link reads as scrollable. */
    -webkit-mask-image: linear-gradient(90deg, #000 calc(100% - 18px), transparent);
    mask-image: linear-gradient(90deg, #000 calc(100% - 18px), transparent);
  }
  .nav-links a { scroll-snap-align: start; }
  /* The header is taller here; keep the hero's top gap proportional. */
  .hero { padding-top: calc(var(--nav-h) + 44px); }
}

@media (max-width: 560px) {
  .container { padding-inline: 16px; }
  .nav-inner { padding-inline: 16px; }
  .section { padding: 64px 0; }
  .section-head { margin-bottom: 28px; }
  .section h2 { margin-bottom: 8px; }
  .section-sub { font-size: 15px; }
  .hero {
    padding-top: calc(var(--nav-h) + 34px);
    padding-bottom: 64px;
  }
  .hero h1 {
    font-size: clamp(1.95rem, 8.7vw, 2.6rem);
    letter-spacing: -0.04em;
  }
  .intro-wrap { gap: 16px; }
  .lede { line-height: 1.68; margin-bottom: 28px; }
  .cta-row { gap: 8px; margin-bottom: 38px; }
  .btn { padding: 11px 16px; font-size: 14px; }
  .stats { gap: 14px 0; padding-top: 18px; }
  .stats > div {
    flex: 1 1 0;
    min-width: 0;
    padding-right: 0;
    margin-right: 0;
    border-right: 0;
  }
  .scroll-cue { display: none; }
  .work-grid { grid-template-columns: 1fr; }
  /* Explicit placement: with only the arrow given a row, the grid placed it
     in column 1 first and squeezed every post title into the 20px arrow cell. */
  .post-link { grid-template-columns: 1fr 20px; row-gap: 4px; }
  .post-date { grid-column: 1 / -1; grid-row: 1; font-size: 11px; }
  .post-title { grid-column: 1; grid-row: 2; font-size: 15px; }
  .post-arrow { grid-column: 2; grid-row: 2; }
  .post-badge { font-size: 10.5px; }
  .writing-tools { gap: 10px; }
  .search-wrap { max-width: none; }
  .notes-card { padding: 20px; gap: 16px; }
  .notes-left { flex-direction: column; gap: 14px; }
  .notes-action { padding-left: 0; }
  .timeline-item { padding-left: 16px; }
  .timeline-when { font-size: 11px; }
  .timeline-body h3 { font-size: 17.5px; }
  .timeline-org { font-size: 12px; }
  /* Micro-labels are decorative at 10.5px on a phone — a step up keeps the
     metadata legible without touching the hero typography. */
  .mini-tags li { font-size: 11px; }
  .work-foot { font-size: 11px; }
  .tag, .badge { font-size: 10.5px; }
  .article-top time { font-size: 11px; }
  .article-card { padding: 20px; }
  .contact-label { font-size: 10.5px; }
  .contact-hint { font-size: 11.5px; }
  .footer-inner { justify-content: flex-start; }

  /* Article pages */
  .post-main { padding: calc(var(--nav-h) + 30px) 0 72px; }
  .post-page { padding-inline: 16px; }
  .post-back { margin-bottom: 20px; }
  .post-head h1 { font-size: 1.72rem; }
  .post-meta { margin-bottom: 28px; padding-bottom: 20px; }
  .prose { font-size: 16px; line-height: 1.72; }
  .prose h2 { font-size: 1.3rem; }
  .prose h3 { font-size: 1.08rem; }
  .prose pre { font-size: 12px; padding: 14px 14px; }
  .post-pager { grid-template-columns: 1fr; margin-top: 46px; padding-top: 24px; }
  .pager-next { text-align: left; }
}

/* Touch screens never fire hover, so the reveal panels on the Focus cards
   are permanently invisible there — stop their loops from burning frames. */
@media (hover: none) {
  .brain-hint-pointer { display: none; }
  .brain-hint-touch { display: inline; }

  .focus-card-interactive .card-anim *,
  .focus-card-interactive .card-anim *::before,
  .focus-card-interactive .card-anim *::after {
    animation-play-state: paused !important;
  }
}

/* ── Motion preferences ────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  #viz { display: none; }
}