:root {
  --paper: #fcfcf9;
  --paper-2: #f6f6f0;
  --ink: #1a1a18;
  --ink-2: #3a3a36;
  --muted: #6a6a63;
  --faint: #9a9a90;
  --rule: #ddddd4;
  --rule-2: #c6c6bc;
  --green: #0f9a55;
  --green-d: #0a7a3f;

  --serif:
    'Computer Modern Serif', 'Latin Modern Roman', Georgia, 'Times New Roman',
    serif;
  --sans: 'Computer Modern Sans', 'Latin Modern Sans', system-ui, sans-serif;
  --mono:
    'Computer Modern Typewriter', 'Latin Modern Mono', ui-monospace, 'SF Mono',
    Menlo, monospace;

  --wrap: 1060px;
  --text: 64ch;
}

* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a {
  color: inherit;
  text-decoration: none;
}
::selection {
  background: rgba(15, 154, 85, 0.16);
}
sup {
  font-size: 0.62em;
  vertical-align: super;
  line-height: 0;
}

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 36px;
}

/* ---- running head ---- */
.head {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: blur(7px);
  border-bottom: 1px solid var(--rule);
}
.head-in {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 11px 36px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-family: var(--mono);
  font-size: 13px;
}
.head-in .brand {
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 9px;
}
.head-in .brand svg {
  width: 15px;
  height: 15px;
}
.head-in nav a {
  margin-left: 18px;
  color: var(--muted);
}
.head-in nav a:hover {
  color: var(--green-d);
}
@media (max-width: 680px) {
  .head-in nav a.opt {
    display: none;
  }
  .head-in nav a {
    margin-left: 13px;
  }
}

/* ---- hero ---- */
.hero {
  padding: 78px 0 26px;
}
.hero h1 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(2.5rem, 6vw, 4.4rem);
  line-height: 1.01;
  letter-spacing: -0.035em;
  margin: 0.5em 0 0;
  max-width: 19ch;
}
.hero h1 .grn {
  color: var(--green-d);
}
.hero h1 .swap {
  white-space: nowrap;
}
.hero h1 .caret {
  display: inline-block;
  visibility: hidden;
  margin-left: 1px;
  border-right: 0.06em solid currentColor;
  height: 0.92em;
  vertical-align: -0.1em;
}
.hero h1 .swap.typing .caret {
  visibility: visible;
  animation: caretblink 1s steps(1) infinite;
}
@keyframes caretblink {
  50% {
    opacity: 0;
  }
}
.hero .lead {
  font-size: clamp(1.12rem, 1.7vw, 1.32rem);
  line-height: 1.6;
  color: var(--ink-2);
  margin: 1.1em 0 0;
  max-width: 56ch;
}
.hero .lead em {
  font-style: italic;
  color: var(--ink);
}
.hero .lead strong {
  font-weight: 700;
}
.hero-actions {
  margin-top: 2em;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.btn {
  font-family: var(--mono);
  font-size: 0.82rem;
  padding: 12px 20px;
  border-radius: 3px;
  border: 1px solid transparent;
  transition: all 0.16s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn.primary {
  background: var(--ink);
  color: var(--paper);
}
.btn.primary:hover {
  background: var(--green-d);
}
.btn.ghost {
  border-color: var(--rule-2);
  color: var(--ink-2);
}
.btn.ghost:hover {
  border-color: var(--ink);
}

/* ---- sections ---- */
section {
  padding: 58px 0 0;
}
.sec-no {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--green-d);
  letter-spacing: 0.04em;
  display: block;
  margin-bottom: 0.5em;
}
h2.sec {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  letter-spacing: 0.006em;
  line-height: 1.12;
  margin: 0;
}
p.body {
  margin: 0.9em 0 0;
  max-width: var(--text);
  color: var(--ink);
}
p.body strong {
  font-weight: 700;
}
p.body em {
  font-style: italic;
}
a.url {
  font-family: var(--mono);
  font-size: 0.9em;
  color: var(--green-d);
}
a.url:hover {
  text-decoration: underline;
}
.divider {
  max-width: var(--wrap);
  margin: 0 auto;
  border: 0;
  border-top: 1px solid var(--rule);
}

/* ---- §1 The Lab: papers pin as a background; the text scrolls over them ---- */
.lab {
  position: relative;
}
.lab-bg {
  position: sticky;
  top: 92px;
  height: calc(100vh - 150px);
  z-index: 0;
  pointer-events: none;
  overflow: visible;
}
.lab-content {
  position: relative;
  z-index: 1;
  margin-top: calc(-100vh + 150px);
  padding-top: 64px;
}
#lab-papers {
  position: absolute;
  right: 3%;
  top: 8%;
  width: 460px;
  height: 80%;
}
@media (max-width: 940px) {
  .lab-bg {
    display: none;
  }
  .lab-content {
    margin-top: 0;
    padding-top: 0;
  }
}

/* ---- publications (refs style) ---- */
ol.refs {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: ref;
  /* same right margin as the body text, so rows clear the paper stream */
  max-width: var(--text);
}
ol.refs li {
  counter-increment: ref;
  position: relative;
  padding: 0 0 18px 3.2em;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--rule);
}
ol.refs li:last-child {
  border-bottom: 0;
}
ol.refs li::before {
  content: '[' counter(ref) ']';
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--green-d);
}
ol.refs .ti {
  font-style: italic;
  font-size: 1.06rem;
}
ol.refs .venue {
  color: var(--muted);
}
ol.refs .mod {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--green-d);
}
ol.refs .ds {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
  margin-top: 5px;
}
ol.refs .ph {
  color: var(--faint);
  font-style: italic;
}

/* publications: each entry pulls a real paper out of the stream, which
   flies in to land in this empty slot and then rides along with the row */
ol.refs li.pub-row {
  display: flex;
  gap: 26px;
  align-items: flex-start;
  padding-left: 0;
}
ol.refs li.pub-row::before {
  content: none;
}
.pub-fig {
  flex: 0 0 96px;
  min-height: 125px; /* reserves the gap the flown-in paper lands in */
}
.pub-info {
  flex: 1 1 auto;
  min-width: 0;
  will-change: transform, opacity;
}
/* info hidden until the scene's JS reveals it (visible if JS is off) */
.js .pub-info {
  opacity: 0;
}
@media (max-width: 620px) {
  ol.refs li.pub-row {
    gap: 16px;
  }
  .pub-fig {
    flex-basis: 70px;
    min-height: 92px;
  }
}

/* ---- tool cards ---- */
.tools {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 34px;
}
.tool {
  border: 1px solid var(--rule-2);
  border-radius: 6px;
  padding: 24px 26px;
  background: var(--paper);
  transition:
    border-color 0.18s,
    transform 0.18s;
}
.tool:hover {
  border-color: var(--green);
  transform: translateY(-2px);
}
.tool .k {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--green-d);
  letter-spacing: 0.04em;
}
.tool h3 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.28rem;
  margin: 7px 0 0;
}
.tool p {
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.5;
  margin: 9px 0 0;
}
.tool .meta {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--faint);
  margin-top: 14px;
}
@media (max-width: 680px) {
  .tools {
    grid-template-columns: 1fr;
  }
}

/* ---- §4 row: text on the left, a slot for the final paper on the right ---- */
.loop-row {
  display: flex;
  gap: 44px;
  align-items: center;
}
.loop-text {
  flex: 1 1 auto;
  min-width: 0;
}
/* reserves the area the final paper descends into, shrinks, and spins within */
.loop-fig {
  flex: 0 0 132px;
  align-self: center;
  min-height: 172px;
}
@media (max-width: 760px) {
  .loop-fig {
    display: none;
  }
}

/* ---- footer ---- */
footer {
  margin-top: 76px;
  border-top: 1.6px solid var(--ink);
  padding: 44px 0 60px;
}
footer .f-in {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}
footer .brand {
  font-family: var(--mono);
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 9px;
}
footer .brand svg {
  width: 15px;
  height: 15px;
}
footer h2 {
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  margin: 18px 0 0;
  max-width: 16ch;
  line-height: 1.1;
}
footer .links {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
}
footer .links h5 {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--faint);
  margin: 0 0 12px;
  font-weight: 400;
  text-transform: uppercase;
}
footer .links a {
  display: block;
  font-size: 0.96rem;
  color: var(--ink-2);
  margin: 8px 0;
}
footer .links a:hover {
  color: var(--green-d);
}
footer .colophon {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--faint);
  margin-top: 40px;
  letter-spacing: 0.02em;
}

/* ---- reveal ---- */
.reveal {
  transition:
    opacity 0.7s ease,
    transform 0.7s cubic-bezier(0.2, 0.7, 0.2, 1);
}
.js .reveal:not(.in) {
  opacity: 0;
  transform: translateY(14px);
}
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001s !important;
    transition: none !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}
:focus-visible {
  outline: 2px solid var(--green);
  outline-offset: 3px;
}