:root {
  --paper: #f7f5ef;
  --surface: #f7f5ef;
  --ink: #1f2d3d;
  --muted: #667783;
  --accent: #3e6278;
  --line: #d4d9da;
  --serif: "DM Serif Display", Georgia, "Times New Roman", serif;
  --sans: "DM Sans", "Helvetica Neue", Arial, sans-serif;
  --content: min(820px, calc(100vw - 48px));
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

body.menu-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
::selection { background: #c8d7dc; color: var(--ink); }

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 10px;
  left: 10px;
  padding: 8px 13px;
  background: var(--ink);
  color: var(--paper);
  transform: translateY(-150%);
}

.skip-link:focus { transform: translateY(0); }

.site-header {
  position: fixed;
  z-index: 100;
  top: 0;
  left: 0;
  width: 100%;
  height: 68px;
  background: rgba(247, 245, 239, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.header-inner {
  width: var(--content);
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.wordmark {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.wordmark span {
  margin: 0 4px;
  color: var(--accent);
  font-weight: 400;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  font-size: 13px;
}

.site-nav a {
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}

.site-nav a:hover,
.site-nav a.active { color: var(--accent); border-color: var(--accent); }
.menu-toggle { display: none; }

.page-shell {
  width: var(--content);
  margin: 0 auto;
  padding: 68px 0 0;
}

.intro {
  padding: 86px 0 76px;
}

.intro h1 {
  margin: 0 0 26px;
  color: var(--accent);
  font-family: var(--sans);
  font-size: clamp(34px, 5vw, 43px);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.035em;
}

.intro > p:not(.intro-kicker) {
  max-width: 700px;
  margin: 0 0 14px;
  color: var(--muted);
}

.intro .intro-lede {
  color: var(--ink) !important;
  font-size: 18px;
  line-height: 1.65;
}

.education-block {
  margin: 30px 0 24px;
  padding-left: 18px;
  border-left: 2px solid var(--accent);
}

.education-block h2 {
  margin: 0 0 7px;
  color: var(--accent);
  font-size: 15px;
  font-weight: 600;
}

.education-block p {
  margin: 4px 0;
  color: var(--muted);
  font-size: 16px;
}

.intro-links {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  color: var(--accent);
  font-size: 16px;
}

.intro-links span { color: var(--line); }
.intro-links a:hover { text-decoration: underline; text-underline-offset: 3px; }

.content-section {
  padding: 62px 0 70px;
  border-top: 1px solid var(--line);
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.section-heading h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: 32px;
  font-weight: 400;
  line-height: 1.2;
}

.subsection-title {
  margin: 0 0 12px;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 400;
  line-height: 1.3;
}

.section-heading-links a,
.teaching-entry > a {
  color: var(--accent);
  font-size: 13px;
  font-weight: 500;
  border-bottom: 1px solid currentColor;
}

.section-heading-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 18px;
}

.section-intro {
  max-width: 690px;
  margin: 0 0 28px;
  color: var(--muted);
}

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

.compact-row {
  display: block;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.compact-row h3,
.research-entry h3,
.teaching-entry h3 {
  margin: 0 0 4px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.45;
}

.compact-row p,
.research-entry p,
.teaching-entry p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.compact-row:hover h3 { color: var(--accent); }

.compact-row h3 a:hover { color: var(--accent); }

.repo-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 7px 16px;
  margin-top: 11px;
}

.repo-keywords span {
  color: var(--muted);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.repo-keywords span::before {
  content: "·";
  margin-right: 6px;
  color: var(--accent);
}

.repo-notebooks {
  display: flex;
  flex-wrap: wrap;
  gap: 7px 18px;
  margin-top: 14px;
}

.repo-notebooks a {
  color: var(--accent);
  font-size: 13px;
  font-weight: 500;
}

.repo-notebooks a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.research-entry {
  padding: 22px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.research-entry a,
.contact a { color: var(--accent); }

.teaching-entry {
  padding: 22px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.teaching-entry > p { max-width: 670px; margin-top: 16px; }
.teaching-entry > a { display: inline-block; margin-top: 18px; }

.contact > p {
  margin: 0;
  color: var(--muted);
}

.contact > p a {
  display: inline-block;
  margin-top: 8px;
  font-size: 17px;
  border-bottom: 1px solid currentColor;
}

.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--line);
}

.site-footer > div {
  width: var(--content);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  padding: 26px 0;
  color: var(--muted);
  font-size: 11px;
}

.site-footer p { margin: 0; }
.site-footer a:hover { color: var(--accent); }

.reveal { opacity: 1; transform: none; }

.js .reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 380ms ease, transform 380ms ease;
}

.js .reveal.visible { opacity: 1; transform: translateY(0); }

@media (max-width: 680px) {
  :root { --content: calc(100vw - 32px); }

  .site-header {
    height: 62px;
    backdrop-filter: none;
  }
  .page-shell { padding-top: 62px; }

  .menu-toggle {
    position: relative;
    z-index: 102;
    width: 36px;
    height: 36px;
    display: grid;
    place-content: center;
    gap: 6px;
    border: 1px solid var(--line);
    border-radius: 3px;
    background: var(--paper);
  }

  .menu-toggle span { width: 15px; height: 1px; background: var(--ink); transition: transform 160ms ease; }
  .menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(3.5px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3.5px) rotate(-45deg); }

  .site-nav {
    position: fixed;
    inset: 0;
    z-index: 101;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 12px;
    padding: 60px 28px;
    background: var(--paper);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 160ms ease, transform 160ms ease, visibility 160ms;
  }

  .site-nav.open { visibility: visible; opacity: 1; transform: translateY(0); }
  .site-nav a { font-family: var(--serif); font-size: 38px; line-height: 1.2; }

  .intro { padding: 62px 0 56px; }
  .intro h1 { margin-bottom: 23px; }
  .content-section { padding: 48px 0 54px; }
  .section-heading { align-items: start; }
  .section-heading h2 { font-size: 29px; }
  .section-heading-links { max-width: 150px; }

  .compact-row h3 { overflow-wrap: anywhere; }

}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
  .reveal { opacity: 1 !important; transform: none !important; }
}