:root {
  --bg:      #F7F3EA;
  --bg-2:    #F1ECDF;
  --paper:   #FBF8EF;
  --ink:     #1a1814;
  --ink-2:   #2b2824;
  --muted:   #6b655a;
  --faint:   #a59d8c;
  --rule:    #1a1814;
  --rule-soft: rgba(26,24,20,0.14);

  --accent:     #1F3A5F;
  --accent-ink: #0f1d2f;
  --accent-soft: rgba(31,58,95,0.10);

  --serif: 'EB Garamond', 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --mono:  'JetBrains Mono', ui-monospace, Menlo, Consolas, monospace;

  --measure: 64ch;
  --col: 1160px;
}
[data-accent="burgundy"] {
  --accent:     #7A2E2E;
  --accent-ink: #4a1c1c;
  --accent-soft: rgba(122,46,46,0.10);
}
[data-accent="forest"] {
  --accent:     #2F5233;
  --accent-ink: #1d3220;
  --accent-soft: rgba(47,82,51,0.10);
}
[data-accent="ink"] {
  --accent:     #1a1814;
  --accent-ink: #000;
  --accent-soft: rgba(26,24,20,0.08);
}
[data-type="sourceserif"] { --serif: 'Source Serif 4', 'EB Garamond', Georgia, serif; }
[data-type="mono"]        { --serif: 'JetBrains Mono', ui-monospace, Menlo, monospace; }

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern", "liga", "onum";
  overflow-x: hidden;
}
::selection { background: var(--accent); color: var(--bg); }
body::before {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.08  0 0 0 0 0.07  0 0 0 0 0.06  0 0 0 0.045 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  opacity: 0.55;
  mix-blend-mode: multiply;
  z-index: 0;
}
.shell {
  position: relative;
  z-index: 1;
  max-width: var(--col);
  margin: 0 auto;
  padding: 0 clamp(24px, 4vw, 56px);
}

/* ===== top bar ===== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(8px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms ease, padding 200ms ease;
}
.topbar.scrolled { border-bottom-color: var(--rule-soft); }
.topbar .bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  transition: padding 200ms ease;
}
.topbar.scrolled .bar { padding: 10px 0; }
.topbar nav a {
  color: var(--ink-2);
  text-decoration: none;
  margin-left: 22px;
  position: relative;
  padding-bottom: 2px;
  transition: opacity 180ms ease, color 180ms ease;
}
.topbar nav a:hover { color: var(--accent); }
.topbar nav a::after {
  content:"";
  position: absolute;
  left: 0; right: 100%;
  bottom: -2px;
  height: 1px;
  background: var(--accent);
  transition: right 200ms ease;
}
.topbar nav a:hover::after, .topbar nav a.active::after { right: 0; }
.topbar nav a.active { color: var(--accent); }
.topbar .brand {
  font-family: var(--serif);
  font-style: italic;
  font-size: 17px;
  letter-spacing: 0;
  text-decoration: none;
  color: var(--ink);
}
.topbar .brand em { font-weight: 500; font-style: italic; color: var(--accent); }

/* Hero event-study mode: fade topbar links until user scrolls */
body[data-page="home"] .topbar:not(.scrolled) nav a { opacity: 0.35; }

/* ===== hero ===== */
.hero {
  padding: 40px 0 40px;
  position: relative;
}
.hero-grid {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 48px;
  align-items: start;
  margin-bottom: 56px;
}
.eyebrow {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 18px;
  display: flex; align-items: center; gap: 10px;
}
.eyebrow .dot {
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: blink 2.2s ease-in-out infinite;
}
@keyframes blink {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.4; transform: scale(0.7); }
}
h1.name {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(44px, 6.4vw, 78px);
  line-height: 0.98;
  letter-spacing: -0.022em;
  color: var(--ink);
  margin-bottom: 14px;
}
h1.name .amp { color: var(--accent); font-style: italic; font-weight: 400; }
.lede {
  font-size: clamp(18px, 1.45vw, 21px);
  color: var(--ink-2);
  max-width: 56ch;
  margin-bottom: 20px;
  line-height: 1.45;
}
.lede em { color: var(--accent); font-style: italic; }

.typewriter {
  font-family: var(--serif);
  font-style: italic;
  font-size: 18px;
  color: var(--muted);
  min-height: 1.6em;
  margin-bottom: 24px;
  border-left: 2px solid var(--accent);
  padding: 4px 0 4px 14px;
}
.typewriter .cursor {
  display: inline-block;
  width: 0.45em;
  background: var(--ink);
  color: transparent;
  animation: caret 1s steps(1) infinite;
  margin-left: 2px;
}
@keyframes caret { 50% { background: transparent; } }

.contact-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 16px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-2);
  margin-bottom: 22px;
}
.contact-grid .k { color: var(--muted); }
.contact-grid a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px dotted var(--faint);
  transition: all 150ms ease;
}
.contact-grid a:hover { color: var(--accent); border-bottom-color: var(--accent); }

.links { display: flex; flex-wrap: wrap; gap: 8px; }
.links a {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  padding: 7px 12px;
  border: 1px solid var(--rule);
  background: transparent;
  transition: all 180ms ease;
}
.links a:hover { background: var(--ink); color: var(--bg); }
.links a.accent { border-color: var(--accent); color: var(--accent); }
.links a.accent:hover { background: var(--accent); color: var(--bg); }

/* ===== event-study nav ===== */
.event-study {
  position: relative;
  padding: 8px 12px 10px;
  background: var(--paper);
  border: 1px solid var(--rule);
  box-shadow: 6px 6px 0 var(--accent);
  min-height: 420px;
}
.es-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 6px 4px 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.es-head .title { color: var(--ink); letter-spacing: 0.12em; }
.es-canvas {
  position: relative;
  height: 380px;
  width: 100%;
}
.es-canvas svg { display: block; width: 100%; height: 100%; overflow: visible; }

/* axes, grid & labels in SVG */
.es-canvas .axis-line { stroke: var(--ink); stroke-width: 1.2; }
.es-canvas .axis-tick { stroke: var(--rule-soft); stroke-width: 1; }
.es-canvas .axis-grid { stroke: var(--rule-soft); stroke-dasharray: 2 4; stroke-width: 0.8; }
.es-canvas .zero-line { stroke: var(--ink); stroke-dasharray: 3 3; stroke-width: 0.8; opacity: 0.55; }
.es-canvas .treat-line { stroke: var(--accent); stroke-dasharray: 4 4; stroke-width: 1; opacity: 0.6; }
.es-canvas .tick-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  fill: var(--muted);
  letter-spacing: 0.04em;
}
.es-canvas .axis-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  fill: var(--faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* coefficient CI bars */
.es-canvas .ci-bar {
  stroke: var(--accent);
  stroke-width: 1;
  opacity: 0.55;
}
.es-canvas .ci-cap {
  stroke: var(--accent);
  stroke-width: 1;
  opacity: 0.55;
}

/* coef points - grouped so we can animate */
.coef-point {
  cursor: pointer;
}
.coef-point .disc {
  fill: var(--accent);
  stroke: var(--paper);
  stroke-width: 1.5;
  transition: transform 200ms ease, r 200ms ease;
  transform-origin: center center;
  transform-box: fill-box;
}
.coef-point.anchor .disc { fill: var(--ink); stroke: var(--paper); }
.coef-point:hover .disc { r: 9; }
.coef-point:hover .halo { opacity: 1; transform: scale(1); }
.coef-point .halo {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1;
  opacity: 0;
  transform: scale(0.5);
  transform-origin: center;
  transform-box: fill-box;
  transition: opacity 220ms ease, transform 220ms ease;
}

/* section label bubbles above coef points */
.coef-point .lbl {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  fill: var(--ink-2);
  transition: fill 180ms ease, font-weight 180ms ease;
}
.coef-point:hover .lbl, .coef-point.hot .lbl { fill: var(--accent); font-weight: 600; }

/* tooltip card for event study */
.es-tip {
  position: absolute;
  min-width: 220px;
  max-width: 280px;
  padding: 12px 14px;
  background: var(--paper);
  border: 1px solid var(--rule);
  box-shadow: 4px 4px 0 var(--accent);
  font-family: var(--serif);
  font-size: 14px;
  line-height: 1.45;
  pointer-events: none;
  opacity: 0;
  transition: opacity 180ms ease;
  z-index: 5;
}
.es-tip.on { opacity: 1; }
.es-tip .tlab {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.es-tip .ttitle { font-weight: 500; color: var(--ink); margin-bottom: 4px; font-size: 17px; line-height: 1.2; }
.es-tip .tsub { color: var(--muted); font-style: italic; font-size: 13px; }

/* foot caption */
.es-caption {
  padding: 10px 4px 0;
  font-family: var(--serif);
  font-style: italic;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.4;
}
.es-caption .note {
  font-family: var(--mono); font-style: normal; font-size: 11px; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--faint); margin-right: 8px;
}

/* ===== section scaffolding ===== */
section.section { padding: 72px 0 24px; position: relative; }
.sec-head {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 32px;
  margin-bottom: 28px;
  align-items: start;
}
.sec-head .num {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--accent);
  letter-spacing: 0.14em;
  padding-top: 10px;
  border-top: 2px solid var(--accent);
  display: inline-block;
  min-width: 110px;
}
.sec-head h1, .sec-head h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(34px, 4vw, 48px);
  letter-spacing: -0.015em;
  line-height: 1.18;
  margin: 0 0 18px 0;
}
.sec-head h1 em, .sec-head h2 em { color: var(--accent); font-style: italic; font-weight: 400; }
.sec-head .sub {
  font-family: var(--serif);
  font-style: italic;
  color: var(--muted);
  font-size: 18px;
  margin-top: 0;
  max-width: 60ch;
}

/* ===== about / interests ===== */
.about-grid { display: grid; grid-template-columns: 160px 1fr; gap: 32px; }
.about-prose {
  max-width: var(--measure);
  font-size: 19px;
  line-height: 1.65;
  color: var(--ink-2);
}
.about-prose p + p { margin-top: 1em; }
.about-prose .drop {
  float: left;
  font-family: var(--serif);
  font-size: 66px;
  line-height: 0.85;
  padding: 6px 10px 0 0;
  color: var(--accent);
  font-weight: 500;
}
.about-prose a {
  color: var(--ink);
  border-bottom: 1px solid var(--accent);
  text-decoration: none;
}
.about-prose a:hover { color: var(--accent); }

.interests {
  margin-top: 36px;
  position: relative;
  min-height: 280px;
  border: 1px solid var(--rule-soft);
  background: var(--paper);
  padding: 24px;
  overflow: hidden;
}
.interests .ilabel {
  position: absolute; top: 10px; left: 14px;
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.interest-node {
  position: absolute;
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink);
  cursor: pointer;
  transition: all 220ms ease;
  padding: 3px 8px;
  white-space: nowrap;
  user-select: none;
}
.interest-node:hover { color: var(--accent); transform: scale(1.08); }
.interest-node.prime { color: var(--accent); font-weight: 500; }
.interest-node .count {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
  font-style: normal;
  vertical-align: super;
  margin-left: 2px;
}
.interests svg.edges { position: absolute; inset: 0; pointer-events: none; }
.interests svg.edges line { stroke: var(--ink); stroke-width: 0.6; opacity: 0.18; }
.interests svg.edges line.hot { stroke: var(--accent); opacity: 0.75; }

/* ===== research list ===== */
.papers { border-top: 1px solid var(--rule); }
.papers-group-head {
  display: grid;
  grid-template-columns: 130px auto 1fr;
  align-items: center;
  gap: 20px;
  padding: 32px 0 14px;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 4px;
}
.papers-group-head:first-child { padding-top: 18px; }
.papers-group-head .gnum {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}
.papers-group-head .glabel {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 500;
  font-size: 22px;
  letter-spacing: -0.005em;
  color: var(--ink);
}
.papers-group-head .grule { display: none; }

.papers-subgroup-head {
  padding: 18px 0 8px 130px;
  border-bottom: 1px dotted var(--rule-soft);
  margin-bottom: 4px;
}
.papers-subgroup-head .slabel {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.paper-placeholder {
  display: grid;
  grid-template-columns: 130px 1fr;
  align-items: center;
  gap: 20px;
  padding: 22px 0;
  border-bottom: 1px solid var(--rule-soft);
  color: var(--faint);
  font-family: var(--serif);
  font-style: italic;
}
.paper-placeholder .ph-mark {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--faint);
  letter-spacing: 0.08em;
}
.paper-placeholder .ph-text {
  font-size: 17px;
  color: var(--muted);
}
.paper {
  display: grid;
  grid-template-columns: 130px 1fr 340px auto;
  gap: 24px;
  padding: 26px 0;
  border-bottom: 1px solid var(--rule-soft);
  cursor: pointer;
  transition: background 180ms ease;
  position: relative;
  align-items: start;
}
.paper:hover {
  background: linear-gradient(to right, transparent, var(--bg-2) 4%, var(--bg-2) 96%, transparent);
}
.paper .mark {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.1em;
  padding-top: 6px;
}
.paper .mark .status {
  display: inline-block;
  padding: 2px 6px;
  background: var(--accent-soft);
  color: var(--accent);
  margin-top: 6px;
  letter-spacing: 0.08em;
}
.paper .mark .status.pub { background: var(--ink); color: var(--bg); }
.paper .mark .status.prog { background: transparent; color: var(--accent); border: 1px dashed var(--accent); }
.paper h3 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 25px;
  line-height: 1.25;
  letter-spacing: -0.012em;
  margin: 0 0 8px 0;
  padding: 0;
  overflow: visible;
  display: block;
  min-height: fit-content;
  text-wrap: pretty;
  overflow-wrap: break-word;
}
.paper .body { min-width: 0; display: flex; flex-direction: column; align-items: stretch; }
.paper h3 .quot { color: var(--accent); font-style: italic; font-weight: 400; }
.paper .authors {
  font-family: var(--serif);
  font-style: italic;
  font-size: 16px;
  color: var(--muted);
  margin: 0 0 10px 0;
  position: static;
  display: block;
}
.paper .authors .me {
  color: var(--ink); font-style: normal; font-weight: 500;
  background: linear-gradient(var(--accent-soft), var(--accent-soft)) no-repeat 0 100%/100% 35%;
  padding: 0 2px;
}
.paper .venue { font-family: var(--mono); font-size: 11.5px; color: var(--muted); letter-spacing: 0.04em; margin-bottom: 6px; }
.paper .abs {
  font-size: 16px; line-height: 1.55; color: var(--ink-2); max-width: 72ch;
  max-height: 0; overflow: hidden;
  transition: max-height 360ms cubic-bezier(.2,.6,.2,1), margin 360ms ease, opacity 280ms ease;
  opacity: 0;
}
.paper.open .abs { max-height: 460px; margin-top: 4px; opacity: 1; }
.paper .abs .tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.paper .abs .tags span {
  font-family: var(--mono); font-size: 10.5px; padding: 3px 8px;
  border: 1px solid var(--rule-soft); color: var(--muted);
  letter-spacing: 0.06em; text-transform: uppercase;
}
.paper .abs .acts {
  margin-top: 14px; display: flex; gap: 10px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
}
.paper .abs .acts a {
  color: var(--accent); text-decoration: none;
  border-bottom: 1px solid var(--accent); padding-bottom: 1px;
}
.paper .abs .acts a:hover { color: var(--ink); border-color: var(--ink); }
.paper .chev {
  font-family: var(--mono); font-size: 18px; color: var(--muted); padding-top: 4px;
  transition: transform 240ms ease, color 180ms ease;
}
.paper.open .chev { transform: rotate(90deg); color: var(--accent); }

/* paper figure placeholder column */
.paper-fig {
  margin: 0;
  padding: 10px 10px 8px;
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: 2px;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--muted);
  letter-spacing: 0.04em;
}
.paper-fig .pf-chart {
  background: var(--bg);
  border: 1px solid var(--rule-soft);
  padding: 6px;
  margin-bottom: 6px;
  aspect-ratio: 13 / 8;
  display: flex;
  align-items: stretch;
}
.paper-fig .pf-chart svg {
  width: 100%;
  height: 100%;
}
.paper-fig .pf-chart img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}
.paper-fig figcaption {
  line-height: 1.35;
  letter-spacing: 0.02em;
  font-style: normal;
}
.paper-fig-spacer {
  /* keeps grid column aligned even when a paper has no figure */
  width: 340px;
}
.paper-fig .pf-chart-img { cursor: zoom-in; }
.pf-lightbox {
  position: fixed; inset: 0; z-index: 999;
  background: rgba(20, 20, 22, 0.86);
  display: flex; align-items: center; justify-content: center;
  padding: 40px; cursor: zoom-out;
  animation: pfFade 180ms ease;
}
.pf-lightbox img {
  max-width: min(94vw, 1400px);
  max-height: 92vh;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
  background: var(--bg);
}
@keyframes pfFade { from { opacity: 0; } to { opacity: 1; } }

/* inline footnote hover */
.fn {
  position: relative;
  font-family: var(--mono); font-size: 0.7em; color: var(--accent); cursor: help; vertical-align: super;
}
.fn:hover::after {
  content: attr(data-note);
  position: absolute; top: 1.4em; left: 0;
  width: 260px; padding: 10px 12px;
  background: var(--paper); border: 1px solid var(--rule);
  font-family: var(--serif); font-style: italic;
  font-size: 14px; line-height: 1.45; color: var(--ink-2);
  letter-spacing: 0; z-index: 40;
  box-shadow: 4px 4px 0 var(--accent);
}

/* ===== CV / timeline ===== */
.timeline { display: grid; grid-template-columns: 160px 1fr; gap: 32px; }
.timeline .col-left {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--muted);
}
.entry {
  padding: 18px 0;
  border-bottom: 1px solid var(--rule-soft);
  display: grid; grid-template-columns: 160px 1fr; gap: 32px;
}
.entry:first-child { border-top: 1px solid var(--rule); }
.entry .when { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.06em; color: var(--muted); padding-top: 5px; }
.entry h4 { font-family: var(--serif); font-weight: 500; font-size: 20px; letter-spacing: -0.008em; margin-bottom: 2px; }
.entry .where { font-family: var(--serif); font-style: italic; color: var(--muted); font-size: 16px; margin-bottom: 4px; }
.entry .det { font-size: 15.5px; color: var(--ink-2); line-height: 1.55; }
.entry ul { padding-left: 1.1em; margin-top: 6px; }
.entry li { margin-bottom: 2px; }

.award-list { list-style: none; }
.award-list li {
  padding: 8px 0; border-bottom: 1px dotted var(--rule-soft);
  font-size: 16px; display: grid; grid-template-columns: 1fr auto;
  gap: 16px; align-items: baseline;
}
.award-list li .yr { font-family: var(--mono); font-size: 12px; color: var(--muted); }

/* skills terminal */
.skills-term {
  background: var(--ink); color: #e8e2d4;
  font-family: var(--mono); font-size: 12.5px; line-height: 1.75;
  padding: 20px 22px; border: 1px solid var(--rule);
  position: relative; overflow: hidden;
}
.skills-term::before {
  content: "~/zekai/skills.py $ cat manifest";
  display: block; color: #6b655a; margin-bottom: 12px;
  font-size: 11.5px; letter-spacing: 0.04em;
}
.skills-term .k { color: #c89e4b; }
.skills-term .s { color: #8fb6e3; }
.skills-term .c { color: #6b655a; }
.skills-term .n { color: #e8e2d4; }

/* project card */
.proj {
  border: 1px solid var(--rule); background: var(--paper);
  padding: 22px 24px;
  display: grid; grid-template-columns: 1fr auto;
  gap: 20px; align-items: start;
  transition: all 220ms ease;
}
.proj:hover { transform: translate(-2px,-2px); box-shadow: 6px 6px 0 var(--accent); }
.proj h4 { font-family: var(--serif); font-weight: 500; font-size: 22px; margin-bottom: 6px; letter-spacing: -0.01em; }
.proj .role {
  font-family: var(--mono); font-size: 11px; color: var(--accent);
  letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 8px;
}
.proj p { font-size: 15.5px; color: var(--ink-2); max-width: 60ch; }
.proj .ascii {
  font-family: var(--mono); font-size: 10px;
  color: var(--muted); white-space: pre; line-height: 1.1; opacity: 0.85;
}

.blog-empty {
  border: 1px dashed var(--rule-soft);
  padding: 32px 28px; text-align: center;
  font-family: var(--serif); font-style: italic;
  color: var(--muted); font-size: 17px;
}
.blog-empty a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent); }

footer.foot {
  margin-top: 80px;
  padding: 40px 0 60px;
  border-top: 1px solid var(--rule);
  display: grid; grid-template-columns: 1fr auto;
  gap: 20px; align-items: end;
  font-family: var(--mono); font-size: 11.5px; color: var(--muted); letter-spacing: 0.06em;
}
footer.foot .ascii-sig {
  font-family: var(--mono); font-size: 10px;
  line-height: 1.1; color: var(--faint); white-space: pre;
}

/* ripple cursor */
.ripple {
  position: fixed;
  width: 28px; height: 28px; border-radius: 50%;
  border: 1px solid var(--accent);
  pointer-events: none;
  transform: translate(-50%,-50%);
  z-index: 60;
  animation: ripple 720ms ease-out forwards;
  mix-blend-mode: multiply;
}
@keyframes ripple {
  0%   { transform: translate(-50%,-50%) scale(0.4); opacity: 0.8; }
  100% { transform: translate(-50%,-50%) scale(2.2); opacity: 0; }
}

/* tweaks */
.tweaks {
  position: fixed; right: 20px; bottom: 20px;
  width: 280px; background: var(--paper);
  border: 1px solid var(--rule);
  box-shadow: 6px 6px 0 var(--accent);
  font-family: var(--mono); font-size: 12px;
  z-index: 80; display: none;
}
.tweaks.open { display: block; }
.tweaks header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 14px; border-bottom: 1px solid var(--rule-soft);
  letter-spacing: 0.12em; text-transform: uppercase; font-size: 11px;
}
.tweaks header button { background: none; border: none; cursor: pointer; font-size: 15px; color: var(--muted); }
.tweaks .row { padding: 10px 14px; border-bottom: 1px solid var(--rule-soft); }
.tweaks .row:last-child { border-bottom: none; }
.tweaks .row label {
  display: block; font-size: 10px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--muted); margin-bottom: 6px;
}
.tweaks .chips { display: flex; flex-wrap: wrap; gap: 4px; }
.tweaks .chip {
  font-family: var(--mono); font-size: 10.5px;
  padding: 4px 8px; background: transparent;
  border: 1px solid var(--rule-soft); cursor: pointer;
  letter-spacing: 0.04em; color: var(--ink-2); text-transform: uppercase;
}
.tweaks .chip.active { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.tweaks .chip.swatch { width: 22px; height: 22px; padding: 0; border-radius: 50%; border: 2px solid transparent; }
.tweaks .chip.swatch.active { border-color: var(--ink); }

/* portrait on home */
.portrait figure { position: relative; width: 100%; max-width: 240px; margin: 0; }
.portrait .frame {
  aspect-ratio: 4/5; background: var(--bg-2);
  border: 1px solid var(--rule); padding: 10px;
  box-shadow: 5px 5px 0 var(--accent);
  transition: box-shadow 220ms ease, transform 220ms ease;
  overflow: hidden; position: relative;
}
.portrait .frame img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  filter: grayscale(0.2) contrast(1.03);
}
.portrait figure:hover .frame {
  box-shadow: 9px 9px 0 var(--accent); transform: translate(-2px,-2px);
}
.portrait figcaption {
  margin-top: 12px; font-family: var(--mono); font-size: 11px;
  letter-spacing: 0.08em; color: var(--muted); text-align: right;
}

@media (max-width: 900px) {
  body { font-size: 17.5px; }
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .portrait figure { max-width: 260px; margin: 0 auto; }
  .about-grid, .timeline, .entry, .sec-head, .paper { grid-template-columns: 1fr; gap: 14px; }
  .paper .mark { order: -1; }
  .paper-fig-spacer { display: none; }
  .paper-fig { max-width: 100%; }
  .topbar nav { display: none; }
  .event-study { min-height: 360px; }
  .es-canvas { height: 320px; }
  .tweaks { right: 10px; bottom: 10px; width: calc(100% - 20px); max-width: 320px; }
}


/* ============================================================
   Scatter plot (research index) — restored
   ============================================================ */
.research-space {
  margin: 20px 0 36px;
  border: 1px solid var(--rule);
  background: var(--paper);
  position: relative;
}
.rs-head {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 14px 18px; border-bottom: 1px solid var(--rule-soft);
  font-family: var(--mono); font-size: 11.5px;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted);
}
.rs-head .title { color: var(--ink); letter-spacing: 0.12em; }
.rs-head .legend { display: flex; gap: 14px; }
.rs-head .legend span { display: inline-flex; align-items: center; gap: 6px; }
.rs-head .legend i {
  display: inline-block; width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent); flex-shrink: 0;
}
.rs-head .legend i.l2 { background: var(--ink); }
.rs-head .legend i.l3 { background: transparent; border: 1.5px solid var(--accent); }

.rs-canvas {
  position: relative; height: 400px; overflow: hidden; cursor: crosshair;
}
.rs-axis {
  position: absolute; font-family: var(--mono);
  font-size: 10.5px; letter-spacing: 0.08em; color: var(--faint);
  text-transform: uppercase; pointer-events: none;
}
.rs-axis.x { bottom: 10px; right: 18px; }
.rs-axis.y { top: 12px; left: 18px; writing-mode: vertical-rl; transform: rotate(180deg); }
.rs-axis.origin { bottom: 10px; left: 18px; }

.rs-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, var(--rule-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--rule-soft) 1px, transparent 1px);
  background-size: 40px 40px; opacity: 0.45;
}
.rs-point {
  position: absolute;
  transform: translate(-50%, -50%);
  cursor: pointer;
  text-decoration: none;
}
.rs-point .disc {
  display: block;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent);
  border: 1.5px solid var(--paper);
  box-shadow: 0 0 0 1px var(--accent);
  transition: all 180ms ease;
}
.rs-point.published .disc { background: var(--ink); box-shadow: 0 0 0 1px var(--ink); }
.rs-point.progress .disc {
  background: transparent;
  box-shadow: inset 0 0 0 1.5px var(--accent), 0 0 0 1px var(--paper);
}
.rs-point .label {
  position: absolute;
  left: 14px; top: -2px;
  font-family: var(--mono); font-size: 10.5px;
  color: var(--muted); white-space: nowrap;
  letter-spacing: 0.04em; pointer-events: none; opacity: 0.85;
}
.rs-point:hover .disc {
  transform: scale(1.5);
  box-shadow: 0 0 0 6px var(--accent-soft), 0 0 0 1px var(--accent);
}
.rs-point:hover .label { color: var(--ink); opacity: 1; }

.rs-canvas svg.links { position: absolute; inset: 0; pointer-events: none; }
.rs-canvas svg.links line {
  stroke: var(--accent); stroke-width: 0.5;
  stroke-dasharray: 2 3; opacity: 0.25;
}

/* ============================================================
   CV Book — paired spreads
   ============================================================ */
.book-wrap {
  margin: 20px 0 32px;
  perspective: 2400px;
}
.book {
  position: relative;
  max-width: 1040px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 1fr;
  background: var(--paper);
  border: 1px solid var(--rule);
  box-shadow: 0 20px 40px -20px rgba(26,24,20,0.25),
              0 8px 16px -10px rgba(26,24,20,0.18);
  min-height: 640px;
  font-size: 15px;
}
/* subtle central gutter */
.book::before {
  content: "";
  position: absolute;
  left: 50%; top: 0; bottom: 0;
  width: 28px; transform: translateX(-50%);
  background:
    linear-gradient(to right, transparent 0%, rgba(26,24,20,0.08) 35%, rgba(26,24,20,0.14) 50%, rgba(26,24,20,0.08) 65%, transparent 100%);
  pointer-events: none; z-index: 2;
}
.page {
  padding: 44px 44px 54px;
  position: relative;
  background: var(--paper);
}
.page.left  { border-right: 1px solid var(--rule-soft); }
.page.right { }
/* page edge wear on left-most / right-most */
.page.left::before, .page.right::after {
  content: "";
  position: absolute; top: 0; bottom: 0; width: 4px;
  background: linear-gradient(to right, rgba(26,24,20,0.1), transparent);
  opacity: 0.5;
}
.page.left::before { left: 0; }
.page.right::after { right: 0; background: linear-gradient(to left, rgba(26,24,20,0.1), transparent); }

.page .folio {
  position: absolute; bottom: 22px;
  font-family: var(--mono); font-size: 10.5px;
  letter-spacing: 0.14em; color: var(--faint);
  text-transform: uppercase;
}
.page.left  .folio { left: 44px; }
.page.right .folio { right: 44px; }

.page .chap {
  font-family: var(--mono);
  font-size: 10.5px; letter-spacing: 0.16em;
  color: var(--accent); text-transform: uppercase;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule-soft);
}
.page h2.chap-title {
  font-family: var(--serif); font-weight: 500;
  font-size: 36px; line-height: 1.05;
  letter-spacing: -0.015em;
  margin-bottom: 24px;
}
.page h2.chap-title em { color: var(--accent); font-style: italic; font-weight: 400; }
.page h3.sub {
  font-family: var(--serif); font-weight: 500;
  font-size: 18px; margin-top: 18px; margin-bottom: 8px;
  letter-spacing: -0.005em;
}
.page h3.sub:first-child { margin-top: 0; }

.page .epigraph {
  font-family: var(--serif); font-style: italic;
  font-size: 16px; line-height: 1.5; color: var(--muted);
  max-width: 32ch;
  padding-left: 14px; border-left: 2px solid var(--accent);
  margin-top: 30px;
}
.page .epigraph cite {
  display: block; margin-top: 10px;
  font-family: var(--mono); font-style: normal;
  font-size: 10.5px; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--faint);
}

.book .entry { grid-template-columns: 82px 1fr; gap: 18px; padding: 12px 0; }
.book .entry .when { font-size: 10.5px; }
.book .entry h4 { font-size: 17px; }
.book .entry .where { font-size: 14.5px; }
.book .entry .det { font-size: 13.5px; }

.book .award-list li { font-size: 14px; padding: 6px 0; }
.book .award-list li .yr { font-size: 11px; }

.book-nav {
  display: flex; justify-content: space-between; align-items: center;
  max-width: 1040px; margin: 18px auto 0;
  font-family: var(--mono); font-size: 11.5px;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted);
}
.book-nav button {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.08em;
  text-transform: uppercase;
  background: transparent; border: 1px solid var(--rule);
  padding: 8px 16px; cursor: pointer; color: var(--ink);
  transition: all 160ms ease;
}
.book-nav button:hover:not(:disabled) { background: var(--ink); color: var(--bg); }
.book-nav button:disabled { opacity: 0.3; cursor: not-allowed; }
.book-nav .spread-idx { color: var(--accent); font-weight: 500; letter-spacing: 0.12em; }

/* spread transitions */
.book .spread { display: contents; }
.book .spread[hidden] { display: none; }
.book.flip-r .page { animation: flipR 480ms cubic-bezier(.2,.7,.2,1) both; }
.book.flip-l .page { animation: flipL 480ms cubic-bezier(.2,.7,.2,1) both; }
@keyframes flipR {
  0%   { opacity: 0; transform: translateX(40px) rotateY(-12deg); transform-origin: left center; }
  100% { opacity: 1; transform: translateX(0)    rotateY(0); }
}
@keyframes flipL {
  0%   { opacity: 0; transform: translateX(-40px) rotateY(12deg); transform-origin: right center; }
  100% { opacity: 1; transform: translateX(0)     rotateY(0); }
}

/* book on mobile: single column */
@media (max-width: 900px) {
  .book { grid-template-columns: 1fr; min-height: 0; }
  .book::before { display: none; }
  .page.left { border-right: none; border-bottom: 1px solid var(--rule-soft); }
  .page { padding: 28px 24px 40px; }
  .page h2.chap-title { font-size: 28px; }
}