/* ==========================================================================
   Huan-Hsin Tseng — personal site
   Dark-first theme (midnight indigo), light theme via [data-theme="light"].
   The opening (hero) is always dark; it is a cosmic illustration.
   ========================================================================== */

:root {
  --bg: #0e0d1f;
  --bg-raise: #15142d;
  --bg-sunk: #0a0918;
  --ink: #ece6f1;
  --ink-2: #c4bcd4;
  --ink-3: #8f88a6;
  --gold: #dcbd7f;
  --gold-2: #b39058;
  --lilac: #b9a6f2;
  --teal: #8fd3c8;
  --rose: #e39ab5;
  --rule: rgba(236, 230, 241, .11);
  --rule-2: rgba(236, 230, 241, .2);
  --eq-bg: linear-gradient(90deg, rgba(185, 166, 242, .075), rgba(185, 166, 242, .015));
  --card: rgba(255, 255, 255, .025);
  --card-hover: rgba(255, 255, 255, .045);
  --figure-paper: #fbfaf7;
  --focus: #f0d9a6;
  --selection: #4c3f73;
  --shadow: 0 30px 80px -30px rgba(0, 0, 0, .6);

  --font-display: "Cormorant Garamond", "Cormorant", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --font-body: "Source Serif 4", "Source Serif Pro", "Iowan Old Style", Georgia, serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --measure: 66ch;
  --wide: 1280px;
  --gutter: clamp(20px, 5vw, 72px);
  --nav-h: 60px;

  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #f6f2ea;
  --bg-raise: #fffdf8;
  --bg-sunk: #ede7db;
  --ink: #1d1a2c;
  --ink-2: #474060;
  --ink-3: #777089;
  --gold: #8d6a2b;
  --gold-2: #a98447;
  --lilac: #5a45ad;
  --teal: #23766b;
  --rose: #a8456c;
  --rule: rgba(29, 26, 44, .1);
  --rule-2: rgba(29, 26, 44, .2);
  --eq-bg: linear-gradient(90deg, rgba(90, 69, 173, .06), rgba(90, 69, 173, .01));
  --card: rgba(29, 26, 44, .025);
  --card-hover: rgba(29, 26, 44, .05);
  --focus: #8d6a2b;
  --selection: #e3d6f7;
  --shadow: 0 30px 70px -36px rgba(40, 30, 60, .35);
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 12px);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: clamp(17px, 1.05vw + 8px, 19.5px);
  line-height: 1.7;
  font-optical-sizing: auto;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  transition: background-color .5s ease, color .5s ease;
  overflow-x: hidden;
}

::selection { background: var(--selection); color: var(--ink); }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .22em; }
a:hover { color: var(--gold); }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 4px; border-radius: 2px; }
button, input, select { font: inherit; color: inherit; }
img, svg { max-width: 100%; }
img { height: auto; display: block; }
em, i { font-style: italic; }
sup, sub { line-height: 0; }

.skip-link {
  position: fixed; z-index: 100; left: 16px; top: -80px;
  padding: 12px 16px; background: #16152f; color: #fff; border-radius: 4px;
  font-family: var(--font-sans); font-size: 14px;
}
.skip-link:focus { top: 16px; }

.mono { font-family: var(--font-mono); }
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}

/* ==========================================================================
   HERO — always dark
   ========================================================================== */

.hero {
  position: relative;
  isolation: isolate;
  min-height: 100vh;
  min-height: 100svh;
  overflow: hidden;
  background: #07071a;
  color: #f1ecf4;
  display: flex;
  flex-direction: column;
  --hero-ink-2: #cfc7dc;
  --hero-ink-3: #9d96b4;
  --hero-gold: #e4c58a;
}

.hero-stage {
  position: absolute; inset: -24px;
  z-index: -3;
  will-change: transform;
  pointer-events: none;
}
.hero-stage.front { z-index: -1; }
.hero-zoom {
  position: absolute; inset: 0;
  opacity: 0;
  transform: scale(1.06);
  transition: opacity 2.2s ease, transform 3.6s cubic-bezier(.16, .84, .3, 1);
}
.is-loaded .hero-zoom, .no-js .hero-zoom, html:not(.js) .hero-zoom { opacity: 1; transform: none; }
.hero-art {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: 50% 42%;
  opacity: .96;
  filter: saturate(1.04) contrast(1.02);
}
.hero-canvas {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}
.hero-canvas.trails { mix-blend-mode: screen; opacity: .95; }

.hero-shade {
  position: absolute; inset: 0; z-index: -2; pointer-events: none;
  background:
    linear-gradient(90deg, rgba(7, 7, 24, .9) 0%, rgba(7, 7, 24, .82) 30%, rgba(7, 7, 24, .55) 48%, rgba(7, 7, 24, .12) 64%, rgba(7, 7, 24, 0) 74%),
    linear-gradient(0deg, var(--bg) 0%, rgba(14, 13, 31, 0) 16%),
    linear-gradient(180deg, rgba(7, 7, 24, .55) 0%, rgba(7, 7, 24, 0) 18%);
  transition: background .5s ease;
}
:root[data-theme="light"] .hero-shade {
  background:
    linear-gradient(90deg, rgba(7, 7, 24, .9) 0%, rgba(7, 7, 24, .82) 30%, rgba(7, 7, 24, .55) 48%, rgba(7, 7, 24, .12) 64%, rgba(7, 7, 24, 0) 74%),
    linear-gradient(0deg, rgba(7, 7, 24, .9) 0%, rgba(7, 7, 24, 0) 16%),
    linear-gradient(180deg, rgba(7, 7, 24, .55) 0%, rgba(7, 7, 24, 0) 18%);
}

.hero-inner {
  position: relative;
  flex: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-content: center;
  padding: clamp(56px, 8.5vh, 120px) var(--gutter) clamp(146px, 16vh, 176px);
  max-width: 1600px;
  width: 100%;
  margin: 0 auto;
}
.hero-copy { max-width: min(800px, 58vw); }

.hero .eyebrow {
  margin: 0 0 clamp(14px, 2.2vh, 26px);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--hero-gold);
  display: flex; align-items: center; gap: 14px;
}
.hero .eyebrow::before {
  content: ""; width: 42px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--hero-gold));
}

.hero-name {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(40px, 4.6vw, 72px);
  line-height: .95;
  letter-spacing: -.014em;
  margin: 0 0 clamp(16px, 2.6vh, 30px);
  color: #f7f2fa;
  text-shadow: 0 2px 40px rgba(10, 8, 30, .6);
}
.hero-name .line { display: inline-block; white-space: nowrap; }
.hero-name .ch {
  display: inline-block;
  white-space: pre;
  opacity: 0;
  filter: blur(14px);
  transform: translateY(.18em);
  transition: opacity 1.1s ease, filter 1.3s ease, transform 1.3s cubic-bezier(.16, .84, .3, 1);
  transition-delay: calc(var(--i) * 45ms + 250ms);
}
.is-loaded .hero-name .ch { opacity: 1; filter: blur(0); transform: none; }
.hero-name .amp {
  font-style: italic; color: var(--hero-gold);
}

.hero-lede {
  max-width: 34em;
  font-size: clamp(17px, 1vw + 5px, 20.5px);
  line-height: 1.62;
  color: #e9e3ee;
  margin: 0 0 10px;
}
.hero-lede + .hero-lede { color: var(--hero-ink-2); font-size: clamp(15.5px, .8vw + 5px, 18px); max-width: 36em; }
.hero-affil {
  margin: 16px 0 16px;
  font-family: var(--font-sans);
  font-size: 13px;
  line-height: 1.8;
  letter-spacing: .02em;
  color: var(--hero-ink-2);
}
.hero-affil b { font-weight: 500; color: #efe9f3; }
.hero-affil .sep { color: var(--hero-gold); margin: 0 .55em; }
.hero-affil .br-sm { display: none; }

.hero-links {
  display: flex; flex-wrap: wrap; gap: 10px 26px;
  font-family: var(--font-sans);
  font-size: 13.5px;
  letter-spacing: .03em;
}
.hero-links a {
  color: #efe9f3;
  text-decoration: none;
  padding-bottom: 4px;
  border-bottom: 1px solid rgba(239, 233, 243, .3);
  transition: color .25s, border-color .25s;
}
.hero-links a:hover { color: var(--hero-gold); border-color: var(--hero-gold); }
.hero-links a .arr { opacity: .55; font-size: .9em; margin-left: 2px; }

/* staged entrance for hero copy */
.js .rise {
  opacity: 0; transform: translateY(14px);
  transition: opacity 1s ease, transform 1.2s cubic-bezier(.16, .84, .3, 1);
  transition-delay: var(--d, 0ms);
}
.is-loaded .rise { opacity: 1; transform: none; }

/* --- Equation stage (Bleecker sequence) --------------------------------- */
.eq-stage {
  position: relative;
  margin-top: clamp(22px, 3.6vh, 42px);
  padding: 2px 0 0 22px;
  max-width: min(760px, 100%);
}
.eq-stage::before {
  content: ""; position: absolute; left: 0; top: 6px; bottom: 4px; width: 1px;
  background: linear-gradient(180deg, var(--hero-gold), rgba(228, 197, 138, .05));
}
.eq-kicker {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 10.5px; letter-spacing: .16em; text-transform: uppercase;
  color: var(--hero-ink-3);
}
.eq-kicker .eq-book { color: var(--hero-ink-2); letter-spacing: .08em; text-transform: none; font-family: var(--font-display); font-style: italic; font-size: 15px; }
.eq-noscript { font-family: var(--font-display); font-size: 28px; margin: 0; }
.eq-canvas {
  position: relative;
  min-height: 3.3em;
  font-size: clamp(17px, 1.8vw, 30px);
  color: #f6f0f8;
  display: flex; align-items: center;
}
.eq-canvas svg {
  overflow: visible;
  max-width: 100%;
  height: auto;
  filter: drop-shadow(0 0 14px rgba(228, 197, 138, .28));
}
.eq-canvas svg path { transition: fill-opacity 1.1s ease, stroke-width 1.1s ease, stroke .9s ease; }
.eq-canvas svg rect { transition: transform 1s cubic-bezier(.4, 0, .2, 1); transform-box: fill-box; transform-origin: left center; }
.eq-canvas .eq-slide { transition: opacity .7s ease, filter .7s ease, transform .7s ease; }
.eq-canvas .eq-slide.leaving { opacity: 0; filter: blur(6px); transform: translateY(-6px); }
.eq-meta { min-height: 4.4em; }
.eq-title {
  margin: 0 0 1px;
  font-family: var(--font-display);
  font-size: clamp(19px, 1.4vw, 23px);
  font-style: italic;
  color: var(--hero-gold);
  transition: opacity .6s ease;
}
.eq-note {
  margin: 8px 0 0;
  min-height: 3.1em;
  font-size: 14px; line-height: 1.55;
  color: var(--hero-ink-2);
  max-width: 42em;
}
.eq-note .src { font-family: var(--font-mono); font-size: 11px; letter-spacing: .06em; color: var(--hero-ink-3); white-space: nowrap; }
.eq-pager {
  display: flex; gap: 2px; margin-top: 6px; align-items: center;
}
.eq-pager button {
  background: none; border: 0; cursor: pointer;
  font-family: var(--font-display); font-size: 15px; color: var(--hero-ink-3);
  min-width: 34px; height: 30px; padding: 0 6px;
  border-bottom: 1px solid transparent;
  transition: color .3s, border-color .3s;
}
.eq-pager button:hover { color: #fff; }
.eq-pager button[aria-current="true"] { color: var(--hero-gold); border-bottom-color: var(--hero-gold); }
.eq-progress {
  flex: 1; height: 1px; margin-left: 12px; max-width: 160px;
  background: rgba(255, 255, 255, .12); position: relative; overflow: hidden;
}
.eq-progress i {
  position: absolute; inset: 0; transform-origin: left; transform: scaleX(0);
  background: linear-gradient(90deg, rgba(228, 197, 138, .2), var(--hero-gold));
}

/* --- Hero footer: live figure caption + controls ----------------------- */
.hero-foot {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 0 var(--gutter) clamp(20px, 3vh, 34px);
  display: flex; align-items: flex-end; justify-content: flex-end; gap: 14px;
}
.live-caption {
  position: relative;
  max-width: 470px;
  margin: 0;
  padding: 12px 16px 12px 16px;
  border-left: 1px solid rgba(228, 197, 138, .6);
  background: linear-gradient(90deg, rgba(8, 8, 26, .72), rgba(8, 8, 26, .5));
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 0 6px 6px 0;
  font-size: 12.5px; line-height: 1.58;
  color: var(--hero-ink-2);
}
.live-caption b { color: #f3edf6; font-weight: 600; }
.live-caption .katex { font-size: 1.02em; }
.live-caption details { margin-top: 4px; }
.live-caption summary {
  cursor: pointer; display: inline-block;
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .12em; text-transform: uppercase;
  color: var(--hero-gold); list-style: none;
}
.live-caption summary::-webkit-details-marker { display: none; }
.live-caption summary::after { content: " +"; }
.live-caption details[open] summary::after { content: " −"; }
.live-caption .more {
  position: absolute; bottom: calc(100% + 10px); right: 0;
  width: min(560px, calc(100vw - 2 * var(--gutter)));
  max-height: 62vh; overflow: auto;
  padding: 20px 24px;
  background: rgba(12, 11, 32, .94);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(228, 197, 138, .22);
  border-radius: 6px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .5);
  font-size: 14px; color: #d6cfe2;
}
.live-caption .more p { margin: 0 0 10px; }
.live-caption .more p:last-child { margin: 0; }

.motion-ctl {
  display: flex; gap: 10px; align-items: center; flex-shrink: 0;
}
.pill {
  display: inline-flex; align-items: center; gap: 8px;
  height: 36px; padding: 0 16px;
  border-radius: 999px;
  border: 1px solid rgba(239, 233, 243, .28);
  background: rgba(10, 9, 28, .45);
  backdrop-filter: blur(8px);
  color: #efe9f3;
  font-family: var(--font-sans); font-size: 12.5px; letter-spacing: .02em;
  cursor: pointer;
  transition: border-color .25s, color .25s, background .25s;
}
.pill:hover { border-color: var(--hero-gold); color: var(--hero-gold); }
.pill .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--teal); box-shadow: 0 0 10px var(--teal); }
.pill[aria-pressed="true"] .dot { background: #8b84a1; box-shadow: none; }

.scroll-cue {
  position: absolute; left: 50%; bottom: 28px; margin-left: -11px; opacity: .7;
  width: 22px; height: 36px; border-radius: 12px;
  border: 1px solid rgba(239, 233, 243, .3);
}
.scroll-cue::after {
  content: ""; position: absolute; left: 50%; top: 7px; width: 2px; height: 7px; margin-left: -1px;
  background: var(--hero-gold); border-radius: 2px;
  animation: cue 2.2s ease-in-out infinite;
}
@keyframes cue { 0% { opacity: 0; transform: translateY(0); } 30% { opacity: 1; } 80% { opacity: 0; transform: translateY(12px); } 100% { opacity: 0; } }

/* ==========================================================================
   NAVIGATION
   ========================================================================== */
.site-nav {
  position: sticky; top: 0; z-index: 50;
  height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 0 var(--gutter);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  border-bottom: 1px solid var(--rule);
}
.nav-name {
  font-family: var(--font-display); font-size: 22px; font-weight: 500;
  text-decoration: none; color: var(--ink); white-space: nowrap;
  letter-spacing: .005em;
}
.nav-name:hover { color: var(--gold); }
.nav-links { display: flex; align-items: center; gap: clamp(14px, 2vw, 30px); }
.nav-links a {
  font-family: var(--font-sans); font-size: 13.5px; letter-spacing: .02em;
  color: var(--ink-2); text-decoration: none; position: relative; padding: 6px 0;
  white-space: nowrap;
}
.nav-links a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 1px;
  background: var(--gold); transform: scaleX(0); transform-origin: left; transition: transform .35s ease;
}
.nav-links a:hover, .nav-links a.active { color: var(--ink); }
.nav-links a.active::after { transform: scaleX(1); }
.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 50%;
  border: 1px solid var(--rule-2); background: none; cursor: pointer; color: var(--ink-2);
  transition: color .25s, border-color .25s, transform .5s;
}
.theme-toggle:hover { color: var(--gold); border-color: var(--gold); }
.theme-toggle svg { width: 16px; height: 16px; }
.theme-toggle .sun { display: none; }
:root[data-theme="light"] .theme-toggle .sun { display: block; }
:root[data-theme="light"] .theme-toggle .moon { display: none; }
.nav-progress {
  position: absolute; left: 0; bottom: -1px; height: 1px; width: 100%;
  transform-origin: left; transform: scaleX(0);
  background: linear-gradient(90deg, var(--lilac), var(--gold));
}
.nav-menu-btn { display: none; }

/* ==========================================================================
   SECTIONS
   ========================================================================== */
main { display: block; }
.section {
  position: relative;
  max-width: var(--wide);
  margin: 0 auto;
  padding: clamp(80px, 11vw, 150px) var(--gutter) 0;
}
.section + .section { border-top: 0; }
.section-head { margin-bottom: clamp(36px, 5vw, 64px); max-width: 900px; }
.kicker {
  display: flex; align-items: center; gap: 14px;
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 11.5px; letter-spacing: .2em; text-transform: uppercase;
  color: var(--gold);
}
.kicker .num { color: var(--ink-3); }
.kicker::after { content: ""; flex: 0 0 56px; height: 1px; background: var(--rule-2); }
h2.title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(34px, 3.7vw, 54px);
  line-height: 1.02;
  letter-spacing: -.012em;
  margin: 0;
}
h2.title em { color: var(--gold); font-weight: 400; }
.lead {
  font-size: clamp(19px, 1.4vw + 5px, 23px);
  line-height: 1.6;
  color: var(--ink-2);
  max-width: 40em;
  margin: 22px 0 0;
}
.prose { max-width: var(--measure); }
.prose p { margin: 0 0 1.1em; color: var(--ink-2); }
.prose p strong, .prose p b { color: var(--ink); font-weight: 600; }
.prose a { color: var(--ink); text-decoration-color: var(--gold-2); }
.prose a:hover { color: var(--gold); }

/* --- About --------------------------------------------------------------- */
.about-grid {
  display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  gap: clamp(32px, 6vw, 96px); align-items: start;
}
.about-grid .prose p:first-child::first-letter {
  font-family: var(--font-display); float: left;
  font-size: 4.3em; line-height: .78; padding: .07em .1em 0 0; color: var(--gold);
}
.facts { position: sticky; top: calc(var(--nav-h) + 30px); }
.facts dl { margin: 0; }
.facts .group { padding: 18px 0; border-top: 1px solid var(--rule); }
.facts .group:last-child { border-bottom: 1px solid var(--rule); }
.facts dt {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .18em; text-transform: uppercase;
  color: var(--ink-3); margin: 0 0 8px;
}
.facts dd { margin: 0 0 6px; font-size: 15.5px; line-height: 1.5; color: var(--ink); }
.facts dd small { display: block; color: var(--ink-3); font-size: 13.5px; }
.facts .award { color: var(--gold); }

.worldline {
  margin-top: clamp(56px, 8vw, 96px);
  position: relative;
}
.worldline-head { display: flex; justify-content: space-between; align-items: baseline; gap: 20px; flex-wrap: wrap; }
.worldline-head h3 { font-family: var(--font-display); font-weight: 400; font-size: 28px; margin: 0; }
.worldline-head p { margin: 0; font-size: 14px; color: var(--ink-3); font-style: italic; }
.worldline svg { width: 100%; height: auto; display: block; margin-top: 10px; overflow: visible; }
.wl-path { fill: none; stroke: url(#wlGrad); stroke-width: 1.6; }
.wl-path-glow { fill: none; stroke: var(--lilac); stroke-opacity: .18; stroke-width: 7; filter: blur(4px); }
.wl-cone { fill: url(#coneGrad); stroke: var(--gold); stroke-opacity: .5; stroke-width: .8; }
.wl-event circle.node { fill: var(--bg); stroke: var(--gold); stroke-width: 1.4; }
.wl-event circle.halo { fill: var(--gold); opacity: .14; }
.wl-event text { font-family: var(--font-sans); fill: var(--ink-2); font-size: 12.5px; }
.wl-event text.yr { font-family: var(--font-mono); fill: var(--gold); font-size: 11.5px; letter-spacing: .08em; }
.wl-event text.what { font-family: var(--font-display); font-style: italic; fill: var(--ink); font-size: 17px; }
.wl-axis { stroke: var(--rule-2); stroke-width: 1; }
.wl-axis-label { font-family: var(--font-mono); font-size: 10.5px; fill: var(--ink-3); letter-spacing: .12em; }
.worldline-list { display: none; }

/* --- Interests ----------------------------------------------------------- */
.interests { list-style: none; margin: 0; padding: 0; counter-reset: int; }
.interests li {
  display: grid; grid-template-columns: 76px minmax(0, 1fr) auto; gap: 18px;
  align-items: baseline;
  padding: 26px 0;
  border-top: 1px solid var(--rule);
  transition: background .3s;
}
.interests li:last-child { border-bottom: 1px solid var(--rule); }
.interests .roman { font-family: var(--font-display); font-style: italic; font-size: 30px; color: var(--gold); line-height: 1; }
.interests h3 { margin: 0 0 6px; font-family: var(--font-display); font-weight: 500; font-size: clamp(24px, 2vw, 30px); line-height: 1.15; }
.interests p { margin: 0; color: var(--ink-2); max-width: 46em; font-size: .95em; }
.interests .go {
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .1em; color: var(--ink-3);
  text-decoration: none; white-space: nowrap; padding: 6px 0;
}
.interests .go:hover { color: var(--gold); }
.interests li:hover { background: linear-gradient(90deg, transparent, var(--card), transparent); }
.reverse-q {
  margin: 48px 0 0; max-width: 44em;
  padding: 24px 28px; border-radius: 4px;
  background: var(--eq-bg);
  border-left: 2px solid var(--lilac);
  color: var(--ink-2); font-style: italic;
}
.reverse-q b { font-style: normal; color: var(--ink); font-weight: 600; }

/* --- Research chapters ---------------------------------------------------- */
.motto {
  margin: 30px 0 0;
  font-family: var(--font-display); font-style: italic; font-size: clamp(22px, 2vw, 28px);
  line-height: 1.45; color: var(--ink); max-width: 34em;
}
.motto::before { content: "“"; color: var(--gold); margin-right: 2px; }
.motto::after { content: "”"; color: var(--gold); }

#research .section-head { margin-bottom: 0; }
#research .chapter:first-of-type { margin-top: 18px; padding-top: clamp(48px, 6vw, 80px); }
.chapter {
  position: relative;
  padding: clamp(64px, 8vw, 110px) 0 0;
  margin-top: clamp(30px, 4vw, 60px);
  border-top: 1px solid var(--rule);
}
.chapter-head {
  display: grid; grid-template-columns: 110px minmax(0, 1fr); gap: 10px 22px; align-items: start;
  margin-bottom: 34px;
}
.chapter-no {
  font-family: var(--font-display); font-style: italic; font-weight: 300;
  font-size: clamp(48px, 4.6vw, 68px); line-height: .9; color: var(--gold);
  letter-spacing: -.02em;
}
.chapter-no small { display: block; font-family: var(--font-mono); font-style: normal; font-size: 10.5px; letter-spacing: .2em; color: var(--ink-3); margin-top: 10px; text-transform: uppercase; }
.chapter-head .ch-title {
  font-family: var(--font-display); font-weight: 400;
  font-size: clamp(28px, 2.6vw, 40px); line-height: 1.12; margin: 4px 0 12px;
}
.ch-sub { margin: 0; font-style: italic; color: var(--ink-3); font-size: 15.5px; line-height: 1.6; }
.status {
  display: inline-flex; align-items: center; gap: 7px; vertical-align: middle;
  font-family: var(--font-mono); font-style: normal; font-size: 10px; letter-spacing: .16em; text-transform: uppercase;
  padding: 3px 10px 3px 8px; border-radius: 999px; border: 1px solid var(--rule-2); color: var(--ink-2);
  margin-right: 10px;
}
.status::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--teal); }
.status.dev::before { background: var(--lilac); }
.status.found::before { background: var(--gold); }

.ch-body {
  display: block;
  margin-left: 132px;
}
.ch-body::after { content: ""; display: block; clear: both; }
.ch-body > .aside { float: right; width: min(300px, 32%); margin: 6px 0 28px clamp(32px, 4vw, 52px); }
.ch-body > .full, .ch-body > .fig, .ch-body > .diagram, .ch-body > .table-wrap, .ch-body > .bleecker { clear: both; }
.ch-body p { color: var(--ink-2); margin: 0 0 1.1em; max-width: var(--measure); }
.ch-body p strong { color: var(--ink); font-weight: 600; }
.ch-body h4 {
  font-family: var(--font-display); font-weight: 500; font-size: clamp(24px, 2vw, 29px);
  margin: 2.2em 0 .5em; line-height: 1.2; color: var(--ink);
}
.ch-body h4 .tag {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em; color: var(--gold);
  margin-left: 10px; vertical-align: middle; text-transform: uppercase;
}
.ch-body h4:first-child { margin-top: 0; }
.ch-body .work-ref {
  margin: -.1em 0 1.15em;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--ink-3);
}
.work-ref a { color: var(--ink-2); text-decoration-color: var(--rule-2); }
.eq-comparison { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin: 1.6em 0; }
.eq-comparison .eq { margin: 0; min-width: 0; }
.eq .eq-label { font-family: var(--font-mono); font-size: 11px; color: var(--ink-3); margin: 0 0 12px; }
@media (max-width: 700px) { .eq-comparison { grid-template-columns: 1fr; } }

.eq {
  margin: 1.6em 0 1.8em;
  padding: 18px 24px 16px;
  background: var(--eq-bg);
  border-left: 2px solid var(--lilac);
  border-radius: 0 4px 4px 0;
  max-width: 880px;
  overflow-x: auto;
}
.eq .katex-display { margin: .35em 0; }
.eq .katex { font-size: 1.12em; }
.eq-single-line .katex-display > .katex,
.note-diagram .katex-display > .katex { width: max-content; min-width: 100%; }
.eq-single-line .katex-display { scrollbar-width: thin; }
.eq figcaption, .eq .cap {
  margin-top: 8px; font-size: 14.5px; line-height: 1.6; color: var(--ink-3); font-style: italic;
}

.fig { margin: 1.8em 0 2.2em; }
.ch-body > .fig, .ch-body > .diagram, .ch-body > .figure-source { width: min(100%, 680px); }
.ch-body > .fig.concept { width: min(100%, 600px); }
.ch-body > .fig.fig-portrait { width: min(100%, 420px); }
.fig .paper {
  background: var(--figure-paper);
  border-radius: 6px;
  padding: clamp(10px, 1.5vw, 20px);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.fig .paper img { width: 100%; border-radius: 2px; }
.fig .paper.tight { padding: 8px; }
.fig.concept .paper { padding: 0; }
.fig.concept img { display: block; width: 100%; height: auto; }
.visual-note { margin: 12px 0 0; color: var(--ink-3); font-size: 14px; }
.figure-source { margin: 1.4em 0 2em; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); padding: 16px 0; }
.figure-source summary { cursor: pointer; color: var(--ink-2); font-size: 15px; }
.source-figures { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.5fr); gap: 24px; align-items: center; }
.source-figures .fig { min-width: 0; margin-bottom: 0; }
@media (max-width: 700px) { .source-figures { grid-template-columns: 1fr; } }
.fig .pair { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.fig .trio { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; }
.fig figcaption {
  margin-top: 12px; font-size: 14px; line-height: 1.6; color: var(--ink-3);
}
.fig figcaption b { color: var(--ink-2); font-weight: 600; }
.fig figcaption .fl { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--gold); margin-right: 8px; }
.fig .zoom { cursor: zoom-in; }

.aside .fig { margin-top: 0; }
.aside .note {
  font-size: 14px; line-height: 1.6; color: var(--ink-3);
  border-top: 1px solid var(--rule); padding-top: 14px; margin-top: 18px;
}
.aside .note b { color: var(--ink-2); font-weight: 600; }

.diagram {
  margin: 1.4em 0 2em;
  padding: clamp(16px, 2vw, 26px);
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: radial-gradient(120% 120% at 70% 0%, rgba(185, 166, 242, .07), transparent 60%), var(--card);
}
.diagram svg { width: 100%; height: auto; display: block; overflow: visible; }
.diagram svg .d-s { font-size: 13px; }
.diagram figcaption { margin-top: 12px; font-size: 14px; line-height: 1.6; color: var(--ink-3); }
.diagram figcaption .fl { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--gold); margin-right: 8px; }

/* diagram vocabulary — colors follow the theme */
.d-ink { fill: var(--ink); }
.d-ink2 { fill: var(--ink-2); }
.d-ink3 { fill: var(--ink-3); }
.d-gold { fill: var(--gold); }
.d-lilac { fill: var(--lilac); }
.d-teal { fill: var(--teal); }
.s-ink { stroke: var(--ink-2); }
.s-ink3 { stroke: var(--ink-3); }
.s-gold { stroke: var(--gold); }
.s-lilac { stroke: var(--lilac); }
.s-teal { stroke: var(--teal); }
.s-rule { stroke: var(--rule-2); }
.d-t { font-family: var(--font-display); }
.d-ti { font-family: var(--font-display); font-style: italic; }
.d-m { font-family: var(--font-mono); letter-spacing: .08em; }
.d-s { font-family: var(--font-sans); }
.d-anim-flow { stroke-dasharray: 3 7; animation: flow 3.5s linear infinite; }
@keyframes flow { to { stroke-dashoffset: -40; } }

.links-row {
  display: flex; flex-wrap: wrap; gap: 8px 10px; margin: 1.4em 0 0;
  max-width: var(--measure);
}
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px; border-radius: 999px;
  border: 1px solid var(--rule-2);
  font-family: var(--font-sans); font-size: 12.5px; color: var(--ink-2); text-decoration: none;
  transition: border-color .25s, color .25s, background .25s;
}
.chip:hover { border-color: var(--gold); color: var(--gold); background: var(--card); }
.chip .k { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .08em; color: var(--ink-3); }

.next-q {
  margin: 1.6em 0 0; padding: 16px 20px;
  border: 1px dashed var(--rule-2); border-radius: 6px;
  font-size: 15.5px; color: var(--ink-2); max-width: var(--measure);
}
.next-q .lbl { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .16em; text-transform: uppercase; color: var(--lilac); display: block; margin-bottom: 4px; }

/* DANO parameter-count widget */
.knob {
  margin: 1.4em 0 2em; padding: 20px 22px 18px;
  border: 1px solid var(--rule); border-radius: 8px; background: var(--card);
  max-width: 720px;
  overflow: hidden;
}
.knob-top { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.knob label { font-family: var(--font-mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.knob input[type=range] { flex: 1; min-width: 160px; accent-color: var(--gold); }
.knob .kval { font-family: var(--font-display); font-size: 28px; color: var(--gold); min-width: 2.2ch; text-align: right; }
.bars { margin-top: 14px; display: grid; gap: 10px; }
.bar { display: grid; grid-template-columns: 150px minmax(0, 1fr) 110px; align-items: center; gap: 14px; font-size: 14px; color: var(--ink-2); }
.bar .track { height: 10px; border-radius: 5px; background: var(--rule); overflow: hidden; }
.bar .fill { height: 100%; border-radius: 5px; transition: width .5s cubic-bezier(.2, .8, .2, 1); }
.bar.full .fill { background: linear-gradient(90deg, var(--rose), var(--lilac)); }
.bar.diag .fill { background: linear-gradient(90deg, var(--gold-2), var(--gold)); }
.bar .num { font-family: var(--font-mono); font-size: 13px; text-align: right; color: var(--ink); }
.knob .cap { margin-top: 10px; font-size: 13.5px; color: var(--ink-3); font-style: italic; }

.task-table { width: 100%; border-collapse: collapse; margin: 1.4em 0 2em; font-size: 15px; }
.task-table th, .task-table td { text-align: left; vertical-align: top; padding: 12px 14px 12px 0; border-top: 1px solid var(--rule); }
.task-table th { font-family: var(--font-mono); font-weight: 400; font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); border-top: 0; padding-bottom: 8px; }
.task-table td:first-child { font-family: var(--font-display); font-size: 19px; color: var(--ink); white-space: nowrap; padding-right: 20px; }
.task-table td { color: var(--ink-2); }
.table-wrap { overflow-x: auto; max-width: 100%; }

/* Collaborations grid */
.collab {
  margin-top: clamp(64px, 8vw, 110px);
  padding-top: clamp(48px, 6vw, 80px);
  border-top: 1px solid var(--rule);
}
.collab h3 { font-family: var(--font-display); font-weight: 400; font-size: clamp(30px, 3vw, 42px); margin: 0 0 8px; }
.collab > p { color: var(--ink-2); max-width: 44em; margin: 0 0 30px; }
.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.card {
  padding: 22px 22px 20px; border-radius: 8px;
  border: 1px solid var(--rule); background: var(--card);
  transition: border-color .3s, background .3s, transform .4s cubic-bezier(.2, .8, .2, 1);
}
.card:hover { border-color: var(--rule-2); background: var(--card-hover); transform: translateY(-3px); }
.card .tagline { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--gold); margin: 0 0 10px; }
.card h4 { margin: 0 0 8px; font-family: var(--font-display); font-weight: 500; font-size: 22px; line-height: 1.2; }
.card p { margin: 0; font-size: 14.5px; line-height: 1.6; color: var(--ink-2); }
.card .refs { margin-top: 12px; font-family: var(--font-sans); font-size: 12px; color: var(--ink-3); }
.card .refs a { color: var(--ink-2); }

/* Bleecker grid */
.bleecker {
  margin: 2em 0 0;
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px;
}
.bleecker .b-item {
  padding: 18px 20px 14px; border-radius: 6px; border: 1px solid var(--rule); background: var(--card);
  overflow-x: auto;
}
.bleecker .b-item.wide { grid-column: 1 / -1; }
.bleecker .b-no { font-family: var(--font-display); font-style: italic; color: var(--gold); font-size: 18px; margin-right: 8px; }
.bleecker .b-name { font-family: var(--font-display); font-size: 19px; color: var(--ink); }
.bleecker .b-src { float: right; font-family: var(--font-mono); font-size: 10.5px; letter-spacing: .08em; color: var(--ink-3); margin-top: 4px; }
.bleecker .katex-display { margin: .7em 0 .5em; }
.bleecker p { margin: 0; font-size: 14px; line-height: 1.55; color: var(--ink-3); }

/* --- Connections ------------------------------------------------------- */
.twin {
  display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 0 0 clamp(40px, 5vw, 70px);
}
.twin .diagram { margin: 0; }
.twin h4 { margin: 0 0 4px; font-family: var(--font-display); font-weight: 500; font-size: 24px; }
.twin .sub { margin: 0 0 10px; font-size: 14px; color: var(--ink-3); font-style: italic; }
.twin-note { grid-column: 1 / -1; color: var(--ink-2); max-width: 54em; margin: 6px 0 0; }

.dict { width: 100%; border-collapse: collapse; font-size: 15px; }
.dict caption { text-align: left; caption-side: bottom; padding-top: 14px; font-size: 14px; color: var(--ink-3); font-style: italic; }
.dict th, .dict td { padding: 16px 18px 16px 0; text-align: left; vertical-align: top; border-top: 1px solid var(--rule); }
.dict thead th { font-family: var(--font-mono); font-weight: 400; font-size: 10.5px; letter-spacing: .16em; text-transform: uppercase; color: var(--ink-3); border-top: 0; }
.dict tbody th { font-family: var(--font-display); font-weight: 500; font-size: 21px; color: var(--gold); white-space: nowrap; }
.dict td { color: var(--ink-2); line-height: 1.55; }
.dict tbody tr { transition: background .3s; }
.dict tbody tr:hover { background: var(--card); }

.tree { margin-top: clamp(48px, 6vw, 80px); }

/* --- Publications ------------------------------------------------------ */
.pub-tools {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 14px 24px;
  margin: 0 0 26px; padding: 12px 0; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule);
  position: sticky; top: var(--nav-h); z-index: 5;
  background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(10px);
}
.filters { display: flex; flex-wrap: wrap; gap: 6px; }
.filters button {
  border: 1px solid var(--rule-2); background: none; color: var(--ink-2);
  padding: 6px 14px; border-radius: 999px; cursor: pointer;
  font-family: var(--font-sans); font-size: 13px;
  transition: all .25s;
}
.filters button:hover { border-color: var(--gold); color: var(--ink); }
.filters button[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.pub-count { font-family: var(--font-mono); font-size: 12px; color: var(--ink-3); }
.pub-year {
  display: grid; grid-template-columns: 96px minmax(0, 1fr); gap: 20px;
  padding: 10px 0 18px;
}
.pub-year > h3 {
  margin: 14px 0 0; font-family: var(--font-display); font-weight: 300; font-size: 40px; line-height: 1; color: var(--ink-3);
  position: sticky; top: calc(var(--nav-h) + 80px); align-self: start;
}
.pub-list { list-style: none; margin: 0; padding: 0; }
.pub {
  padding: 16px 0 16px; border-top: 1px solid var(--rule);
  display: grid; grid-template-columns: minmax(0, 1fr); gap: 4px;
}
.pub:first-child { border-top: 0; }
.pub .t { font-family: var(--font-display); font-size: 21px; line-height: 1.3; color: var(--ink); font-weight: 500; }
.pub .t a { text-decoration: none; }
.pub .t a:hover { color: var(--gold); }
.pub .sel { color: var(--gold); margin-left: 6px; font-size: .8em; vertical-align: .15em; }
.pub .a { font-size: 14.5px; color: var(--ink-3); line-height: 1.55; }
.pub .a b { color: var(--ink); font-weight: 600; }
.pub .v { font-size: 14.5px; color: var(--ink-2); font-style: italic; }
.pub .l { display: flex; flex-wrap: wrap; gap: 4px 14px; margin-top: 2px; font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .04em; }
.pub .l a { color: var(--ink-3); text-decoration: none; border-bottom: 1px solid var(--rule-2); }
.pub .l a:hover { color: var(--gold); border-color: var(--gold); }
.pub .badge { font-family: var(--font-mono); font-size: 10px; letter-spacing: .12em; text-transform: uppercase; padding: 1px 8px; border-radius: 3px; border: 1px solid var(--rule-2); color: var(--ink-3); margin-left: 4px; font-style: normal; vertical-align: .2em; }
.pub .badge.award { color: var(--gold); border-color: var(--gold-2); }
.pub.is-hidden, .pub-year.is-empty { display: none; }
.pub-foot { margin-top: 28px; font-size: 14.5px; color: var(--ink-3); }

/* --- Experience -------------------------------------------------------- */
.exp-grid { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: clamp(32px, 6vw, 90px); }
.timeline { list-style: none; margin: 0; padding: 0; position: relative; }
.timeline::before { content: ""; position: absolute; left: 6px; top: 10px; bottom: 10px; width: 1px; background: linear-gradient(180deg, var(--gold), var(--lilac), transparent); }
.timeline li { position: relative; padding: 0 0 28px 34px; }
.timeline li::before { content: ""; position: absolute; left: 0; top: 9px; width: 13px; height: 13px; border-radius: 50%; border: 1px solid var(--gold); background: var(--bg); }
.timeline li.now::before { background: var(--gold); box-shadow: 0 0 0 5px color-mix(in srgb, var(--gold) 18%, transparent); }
.timeline .when { font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .1em; color: var(--gold); }
.timeline .role { font-family: var(--font-display); font-size: 23px; line-height: 1.25; margin: 2px 0 2px; color: var(--ink); }
.timeline .org { color: var(--ink-2); font-size: 15.5px; }
.timeline .what { color: var(--ink-3); font-size: 14.5px; margin-top: 4px; line-height: 1.55; }
.side-block { margin-bottom: 36px; }
.side-block h3 { font-family: var(--font-mono); font-weight: 400; font-size: 11px; letter-spacing: .18em; text-transform: uppercase; color: var(--ink-3); margin: 0 0 12px; padding-bottom: 10px; border-bottom: 1px solid var(--rule); }
.side-block ul { list-style: none; margin: 0; padding: 0; }
.side-block li { padding: 7px 0; font-size: 15px; line-height: 1.5; color: var(--ink-2); }
.side-block li .yr { font-family: var(--font-mono); font-size: 11.5px; color: var(--gold); margin-right: 8px; }
.side-block li em { color: var(--ink-3); }

/* --- Contact / footer --------------------------------------------------- */
.contact {
  position: relative; overflow: hidden; isolation: isolate;
  margin-top: clamp(100px, 12vw, 170px);
  padding: clamp(90px, 12vw, 160px) var(--gutter) 48px;
  color: #efe9f3;
  background: #08081a;
}
.contact-bg {
  position: absolute; inset: 0; z-index: -2;
  background: url("../img/art/cosmos-v1-1774.webp") 70% 40% / cover no-repeat;
  opacity: .5;
}
.contact::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: linear-gradient(180deg, var(--bg) 0%, rgba(8, 8, 26, .82) 22%, rgba(8, 8, 26, .7) 60%, #07071a 100%),
              radial-gradient(80% 80% at 0% 50%, rgba(8, 8, 26, .9), transparent 70%);
}
.contact-inner { max-width: var(--wide); margin: 0 auto; }
.contact .kicker { color: #e4c58a; }
.contact .kicker::after { background: rgba(239, 233, 243, .2); }
.contact h2 { font-family: var(--font-display); font-weight: 300; font-size: clamp(36px, 4.8vw, 64px); line-height: 1; margin: 0 0 26px; }
.contact h2 em { color: #e4c58a; }
.contact p.c-lead { max-width: 34em; color: #d4cde0; font-size: 19px; margin: 0 0 34px; }
.contact-links { display: flex; flex-wrap: wrap; gap: 12px; }
.contact-links a {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 20px; border-radius: 999px;
  border: 1px solid rgba(239, 233, 243, .25); background: rgba(10, 9, 28, .5); backdrop-filter: blur(8px);
  color: #efe9f3; text-decoration: none; font-family: var(--font-sans); font-size: 14px;
  transition: border-color .25s, color .25s, background .25s;
}
.contact-links a:hover { border-color: #e4c58a; color: #e4c58a; }
.contact-links svg { width: 16px; height: 16px; }
.colophon {
  max-width: var(--wide); margin: clamp(80px, 10vw, 140px) auto 0;
  display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap;
  padding-top: 22px; border-top: 1px solid rgba(239, 233, 243, .12);
  font-family: var(--font-sans); font-size: 12.5px; line-height: 1.7; color: #8f88a6;
}
.colophon p { margin: 0; max-width: 62em; }
.colophon a { color: #b9b2c9; }

/* --- Research note preview --------------------------------------------- */
.note-preview { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(28px, 4vw, 56px); align-items: start; }
.note-preview .fig { margin: 0; max-width: 540px; }
.note-meta { font-family: var(--font-mono); font-size: 11px; color: var(--gold); letter-spacing: .06em; margin: 0 0 16px; }
.note-preview h3, .note-preview h4 { font: 500 clamp(27px, 2.5vw, 36px)/1.16 var(--font-display); margin: 0 0 20px; }
.note-preview h3 a, .note-preview h4 a { text-decoration: none; }
.note-preview-copy > p:not(.note-meta) { color: var(--ink-2); }
.note-preview .eq { font-size: 17px; padding: 16px 18px; }
.note-teaser-result { font-size: 17px; color: var(--ink); margin: 22px 0; }
.note-figure.planar-figure { width: min(1060px, calc(100vw - 40px)); max-width: none; position: relative; left: 50%; transform: translateX(-50%); }
.wl-math { color: var(--ink-3); font-size: .94em; }
@media (max-width: 900px) {
  .note-preview { grid-template-columns: minmax(0, 1fr); }
  .note-preview .fig { max-width: 540px; }
}

/* --- Expository note --------------------------------------------------- */
.note-main { max-width: 900px; margin: 0 auto; padding: clamp(40px, 7vw, 88px) var(--gutter) 64px; }
.note-header { margin-bottom: 40px; }
.note-header h1 { font: 400 clamp(36px, 4.2vw, 52px)/1.08 var(--font-display); letter-spacing: -.015em; margin: 0 0 22px; }
.note-header .kicker { font-size: 10px; letter-spacing: .12em; flex-wrap: wrap; }
.note-deck { font-size: clamp(20px, 2vw, 25px); line-height: 1.4; margin: 0 0 24px; }
.note-article > p, .note-section p, .note-references li { color: var(--ink-2); }
.note-article p { margin: 0 0 1.1em; }
.note-header .note-meta { font-size: 11px; line-height: 1.8; margin: 0; }
.note-figure { max-width: 680px; margin: 38px auto; }
.note-toc { display: grid; gap: 8px; margin: 36px 0 48px; padding: 20px 0; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); font: 14px/1.6 var(--font-sans); }
.note-toc a { width: fit-content; text-decoration: none; color: var(--ink-2); }
.note-toc a:hover { color: var(--gold); }
.note-section { margin-top: 52px; }
.note-section h2 { font: 500 clamp(27px, 2.8vw, 34px)/1.18 var(--font-display); margin: 0 0 24px; }
.note-section h3 { font: 500 clamp(23px, 2.3vw, 28px)/1.24 var(--font-display); margin: 36px 0 18px; }
.note-formal { border-left: 2px solid var(--lilac); background: var(--card); padding: 20px 24px 10px; margin: 26px 0; }
.note-formal b { font-weight: 600; color: var(--ink); }
.note-article .eq { max-width: none; }
.note-diagram { overflow-x: auto; padding-bottom: 6px; }
.note-table-wrap { overflow-x: auto; margin: 28px 0; }
.note-table { border-collapse: collapse; width: 100%; font-size: 16px; }
.note-table caption { text-align: left; color: var(--ink-3); font-size: 14px; margin-bottom: 14px; }
.note-table th, .note-table td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--rule); }
.note-table th { font-weight: 500; color: var(--ink); }
.note-table td { color: var(--ink-2); }
.note-references { font-size: 16px; }
.note-references li { margin-bottom: 16px; }
.note-back { margin-top: 48px !important; font-family: var(--font-sans); font-size: 14px; }
.note-footer { max-width: 900px; margin: 0 auto; padding: 24px var(--gutter) 40px; border-top: 1px solid var(--rule); color: var(--ink-3); font: 12px/1.7 var(--font-sans); }
@media (max-width: 760px) {
  .note-page .nav-links { gap: 10px; }
  .note-page .nav-links a { font-size: 11px; }
  .note-page .nav-name { font-size: 18px; }
  .note-main { padding-right: 20px; padding-left: 20px; }
  .note-formal { padding-right: 14px; padding-left: 16px; }
  .note-table th, .note-table td { padding: 10px 12px; }
}

/* --- Lightbox ---------------------------------------------------------- */
.lightbox {
  position: fixed; inset: 0; z-index: 200; display: grid; place-items: center;
  background: rgba(6, 6, 18, .9); backdrop-filter: blur(6px);
  padding: 4vw; overflow-y: auto; opacity: 0; pointer-events: none; transition: opacity .3s;
}
.lightbox.open { opacity: 1; pointer-events: auto; }
.lightbox img { max-width: 100%; max-height: 86vh; background: #fff; border-radius: 4px; padding: 10px; }
.lightbox p { color: #cfc7dc; font-size: 14px; max-width: 70em; text-align: center; margin: 14px auto 0; }
.lightbox-original { display: block; width: fit-content; margin: 14px auto 0; color: #cfc7dc; font-size: 14px; }
.lightbox button { position: absolute; top: 18px; right: 22px; }

/* --- Scroll reveal ------------------------------------------------------ */
.js .reveal { opacity: 0; transform: translateY(26px); transition: opacity 1s ease, transform 1.1s cubic-bezier(.16, .84, .3, 1); }
.js .reveal.in { opacity: 1; transform: none; }

/* --- KaTeX tweaks ------------------------------------------------------- */
.katex { font-size: 1.04em; }
.katex-display { overflow-x: auto; overflow-y: hidden; padding: 2px 0; }

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 1180px) {
  .ch-body { margin-left: 0; }
  .chapter-head { grid-template-columns: 90px minmax(0, 1fr); }
  .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 1000px) {
  .hero-copy { max-width: min(720px, 76vw); }
  .ch-body > .aside { float: none; width: auto; margin: 0 0 1.6em; }
  .about-grid, .exp-grid { grid-template-columns: minmax(0, 1fr); }
  .facts { position: static; }
  .twin { grid-template-columns: 1fr; }
  .nav-links a.opt { display: none; }
}

@media (min-width: 1101px) {
  .hero-name { white-space: nowrap; }
}
@media (min-width: 901px) and (max-width: 1100px) {
  .hero-art { object-position: 68% 40%; }
  .hero-copy { max-width: min(640px, 62vw); }
}
@media (max-width: 900px) {
  .hero { min-height: auto; }
  .hero-stage { inset: 0 0 auto 0; height: 72vh; min-height: 480px; }
  .hero-art { object-position: 80% 26%; }
  .hero-shade {
    bottom: auto; height: 72vh; min-height: 480px;
    background:
      linear-gradient(180deg, rgba(7, 7, 24, .25) 0%, rgba(7, 7, 24, 0) 22%, rgba(7, 7, 24, .35) 44%, rgba(7, 7, 24, .82) 62%, #07071a 84%, #07071a 100%) !important;
  }
  .hero-inner { padding: 40vh 20px 30px; align-content: start; }
  .hero .eyebrow { font-size: 10px; letter-spacing: .16em; }
  .hero .eyebrow::before { width: 24px; }
  .hero-copy { max-width: 100%; }
  .hero-name { font-size: clamp(34px, 8.8vw, 52px); line-height: 1; }
  .hero-foot { position: relative; flex-direction: column; align-items: stretch; gap: 14px; padding: 6px 20px 34px; }
  .live-caption { max-width: none; }
  .live-caption .more { left: 0; right: auto; bottom: calc(100% + 6px); width: calc(100vw - 40px); }
  .scroll-cue { display: none; }
  .eq-stage { padding-left: 16px; }
  .eq-canvas { min-height: 3.4em; font-size: clamp(14px, 3.7vw, 21px); }
}
@media (max-width: 760px) {
  :root { --nav-h: 56px; }
  body { font-size: 17px; }
  .nav-links { gap: 14px; }
  .nav-links a.opt2 { display: none; }
  .nav-name { font-size: 19px; }
  .chapter-head { grid-template-columns: 1fr; }
  .chapter-no { font-size: 44px; }
  .interests li { grid-template-columns: 44px minmax(0, 1fr); }
  .interests .go { grid-column: 2; }
  .worldline svg { display: none; }
  .worldline-list { display: block; list-style: none; margin: 18px 0 0; padding: 0; border-left: 1px solid var(--gold); }
  .worldline-list li { padding: 0 0 16px 18px; position: relative; color: var(--ink-2); font-size: 15.5px; }
  .worldline-list li::before { content: ""; position: absolute; left: -5px; top: 9px; width: 9px; height: 9px; border-radius: 50%; background: var(--bg); border: 1px solid var(--gold); }
  .worldline-list .yr { font-family: var(--font-mono); font-size: 11.5px; color: var(--gold); margin-right: 8px; }
  .cards { grid-template-columns: minmax(0, 1fr); }
  .bleecker { grid-template-columns: minmax(0, 1fr); }
  .fig .pair, .fig .trio { grid-template-columns: 1fr; }
  .pub-year { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .pub-year > h3 { position: static; font-size: 30px; margin: 10px 0 4px; }
  .pub-tools { position: static; }
  .bar { grid-template-columns: 96px minmax(0, 1fr) 80px; font-size: 13px; }
  .dict tbody th { font-size: 18px; white-space: normal; }
  .dict, .dict thead, .dict tbody, .dict tr, .dict th, .dict td { display: block; }
  .dict thead { display: none; }
  .dict tbody tr { padding: 14px 0; border-top: 1px solid var(--rule); }
  .dict th, .dict td { border: 0; padding: 4px 0; }
  .dict td::before { content: attr(data-col); display: block; font-family: var(--font-mono); font-size: 10px; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }
  .task-table td:first-child { white-space: normal; }
  .eq { padding: 14px 14px 12px; }
  .eq .katex { font-size: .98em; }
  .ch-body h4 .tag { display: block; margin: 4px 0 0; }
}

@media (max-width: 420px) {
  .nav-links a.opt3 { display: none; }
  .eq-note { min-height: 4.65em; }
}
@media (max-width: 360px) {
  .site-nav { gap: 12px; }
  .nav-links a[href="#publications"] { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; transition-delay: 0ms !important; }
  .reveal, .rise, .hero-name .ch { opacity: 1 !important; transform: none !important; filter: none !important; }
  .hero-zoom { opacity: 1 !important; transform: none !important; }
}

@media print {
  .hero-stage, .hero-canvas, .site-nav, .motion-ctl, .scroll-cue, .pub-tools, .contact-bg { display: none !important; }
  .hero { min-height: auto; background: none; color: #000; }
  body { background: #fff; color: #000; }
}