/* Layout: a working-paper title page. A narrow sticky "author column" on the
   left (portrait, affiliation, contact), the body on the right, read top to
   bottom like a paper: About, Research, Teaching. Stacks to one column on phones. */
:root {
  --paper:   #f5f6f2;   /* cool off-white, slight olive bias */
  --surface: #ffffff;
  --ink:     #18212b;   /* navy-black ink */
  --muted:   #5a6470;
  --rule:    #d9ddd4;
  --accent:  #4c6124;   /* Fiesole olive */
  --accent-soft: #e6ead9;

  --font-display: "Newsreader", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --font-body: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --step--1: 0.8125rem;
  --step-0: 1rem;
  --step-1: 1.1875rem;
  --step-2: 1.5rem;
  --step-3: clamp(2.25rem, 1.6rem + 2.6vw, 3.5rem);

  --measure: 64ch;
  --radius: 4px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper:   #121619;
    --surface: #1a1f23;
    --ink:     #e7e9e3;
    --muted:   #9aa39c;
    --rule:    #2c3337;
    --accent:  #b6c97e;
    --accent-soft: #252c1e;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper:   #121619;
  --surface: #1a1f23;
  --ink:     #e7e9e3;
  --muted:   #9aa39c;
  --rule:    #2c3337;
  --accent:  #b6c97e;
  --accent-soft: #252c1e;
  color-scheme: dark;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }

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

.skip {
  position: absolute; left: -999px; top: 0;
  background: var(--ink); color: var(--paper); padding: 0.5rem 1rem; z-index: 20;
}
.skip:focus { left: max(16px, env(safe-area-inset-left, 0px)); top: 0.5rem; }

.wrap {
  max-width: 68rem;
  margin: 0 auto;
  padding-left: max(24px, env(safe-area-inset-left, 0px));
  padding-right: max(24px, env(safe-area-inset-right, 0px));
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 10;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--rule);
}
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding-block: 0.85rem;
}
.wordmark {
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.nav { display: flex; align-items: center; gap: 0.25rem; }
.nav a {
  font-size: var(--step--1);
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--muted);
  text-decoration: none;
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius);
}
.nav a:hover { color: var(--ink); }
.nav a[aria-current="true"] { color: var(--ink); background: var(--accent-soft); }
.nav a { white-space: nowrap; }
.nav .ext::after { content: " \2197"; font-size: 0.85em; }

.theme-toggle {
  margin-left: 0.25rem;
  width: 2rem; height: 2rem;
  display: inline-grid; place-items: center;
  border: 1px solid var(--rule); border-radius: 999px;
  background: transparent; color: var(--muted); cursor: pointer;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--muted); }
.theme-toggle svg { width: 1rem; height: 1rem; }
.theme-toggle .sun { display: none; }
:root[data-theme="dark"] .theme-toggle .sun { display: block; }
:root[data-theme="dark"] .theme-toggle .moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .moon { display: none; }
}

/* ---------- Page grid ---------- */
.page {
  display: grid;
  grid-template-columns: 15rem minmax(0, 1fr);
  gap: 4.5rem;
  padding-block: 4rem 5rem;
}

.author {
  position: sticky;
  top: 6rem;
  align-self: start;
  display: grid;
  gap: 1.5rem;
}
.portrait {
  width: 100%;
  max-width: 15rem;
  aspect-ratio: 4 / 5;
  border-radius: var(--radius);
  background: var(--accent-soft);
  overflow: hidden;
  position: relative;
}
.portrait img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: 50% 40%; }
.portrait .monogram {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  font-family: var(--font-display);
  font-size: 4.5rem; font-weight: 300; font-style: italic;
  color: var(--accent);
  letter-spacing: -0.02em;
}

.label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0 0 0.4rem;
}

.contact { font-style: normal; font-size: var(--step--1); line-height: 1.6; color: var(--muted); }
.contact .email-row { display: flex; align-items: center; gap: 0.4rem; flex-wrap: wrap; margin-bottom: 0.5rem; }
.contact .email { color: var(--ink); font-weight: 500; text-decoration: none; word-break: break-all; }
.contact .email:hover { color: var(--accent); }
.copy {
  font: inherit; font-family: var(--font-mono); font-size: 0.6875rem;
  text-transform: uppercase; letter-spacing: 0.08em;
  background: transparent; color: var(--muted);
  border: 1px solid var(--rule); border-radius: var(--radius);
  padding: 0.1rem 0.4rem; cursor: pointer;
}
.copy:hover { color: var(--ink); border-color: var(--muted); }

.profiles { list-style: none; margin: 1rem 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.35rem 1rem; font-size: var(--step--1); }
.profiles a { color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--rule); }
.profiles a:hover { color: var(--accent); border-color: currentColor; }
.profiles a::after { content: " \2197"; font-size: 0.85em; color: var(--muted); }

.btn-cv {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.6rem 1rem;
  border-radius: var(--radius);
  background: var(--ink); color: var(--paper);
  font-size: var(--step--1); font-weight: 600; letter-spacing: 0.02em;
  text-decoration: none;
}
.btn-cv:hover { background: var(--accent); color: var(--paper); }
.btn-cv svg { width: 1rem; height: 1rem; }

/* ---------- Main column ---------- */
main { min-width: 0; }
section + section { margin-top: 5rem; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin: 0 0 1rem;
}

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 400; text-wrap: balance; margin: 0; }

.name {
  font-size: var(--step-3);
  line-height: 1.05;
  letter-spacing: -0.025em;
}
.role {
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--step-1);
  color: var(--muted);
  margin: 0.75rem 0 2rem;
}
.bio { max-width: var(--measure); font-size: 1.0625rem; }
.bio p { margin: 0 0 1rem; }

.fields {
  margin: 2rem 0 0; padding: 1.25rem 0 0;
  border-top: 1px solid var(--rule);
  max-width: var(--measure);
}
.fields .label { margin-bottom: 0.6rem; }
.fields ul { display: flex; flex-wrap: wrap; gap: 0.5rem; list-style: none; margin: 0; padding: 0; }
.fields li {
  font-size: var(--step--1); color: var(--ink);
  padding: 0.2rem 0.7rem;
  border: 1px solid var(--rule); border-radius: 999px;
  background: var(--surface);
}

.section-head {
  display: flex; align-items: baseline; justify-content: space-between; gap: 1rem;
  padding-bottom: 0.75rem; margin-bottom: 0.5rem;
  border-bottom: 1px solid var(--ink);
}
.section-head h2 { font-size: var(--step-2); letter-spacing: -0.01em; }
.section-head .count { font-family: var(--font-mono); font-size: 0.75rem; color: var(--muted); }

.subhead { margin: 2rem 0 0; }

/* ---------- Papers ---------- */
.papers { list-style: none; margin: 0; padding: 0; }
.paper {
  padding-block: 1.75rem;
  border-bottom: 1px solid var(--rule);
}
.paper-title {
  font-size: 1.375rem;
  line-height: 1.3;
  letter-spacing: -0.005em;
  max-width: 40ch;
}
.paper .coauthors { margin: 0.4rem 0 0; color: var(--muted); font-size: var(--step--1); }
.paper .coauthors a { color: inherit; }
.paper-title a, .course-title a { color: inherit; text-decoration-color: var(--rule); }
.paper-title a:hover, .course-title a:hover { color: var(--accent); text-decoration-color: currentColor; }

.toggles { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }
.toggle {
  font: inherit;
  font-size: var(--step--1); font-weight: 500;
  display: inline-flex; align-items: center; gap: 0.45rem;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--rule); border-radius: 999px;
  background: var(--surface); color: var(--ink);
  cursor: pointer;
  transition: border-color 0.15s, background-color 0.15s;
}
.toggle:hover { border-color: var(--accent); }
.toggle[aria-expanded="true"] { background: var(--accent-soft); border-color: var(--accent); }
.toggle .chev { width: 0.7rem; height: 0.7rem; transition: transform 0.2s; }
.toggle[aria-expanded="true"] .chev { transform: rotate(180deg); }
@media (prefers-reduced-motion: reduce) { .toggle .chev, .toggle { transition: none; } }

.panel {
  margin-top: 1rem;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  max-width: var(--measure);
  font-size: 0.9375rem;
}
.panel p { margin: 0; }
.panel p + p { margin-top: 0.75rem; }
.panel ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 0.35rem; }
.panel li { display: flex; gap: 1rem; justify-content: space-between; flex-wrap: wrap; }
.panel .when { font-family: var(--font-mono); font-size: 0.8125rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.placeholder { color: var(--muted); font-style: italic; }

/* ---------- Teaching ---------- */
.courses { list-style: none; margin: 0; padding: 0; }
.course {
  display: grid;
  grid-template-columns: 11rem minmax(0, 1fr);
  gap: 1.5rem;
  padding-block: 1.5rem;
  border-bottom: 1px solid var(--rule);
}
.course .kind {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  padding-top: 0.3rem;
}
.course-title { font-size: 1.25rem; line-height: 1.35; }
.course p { margin: 0.35rem 0 0; color: var(--muted); font-size: var(--step--1); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--rule); }
.site-footer .wrap {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.5rem 1.5rem;
  padding-block: 1.5rem 2rem;
  font-size: var(--step--1); color: var(--muted);
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .page { grid-template-columns: 12rem minmax(0, 1fr); gap: 3rem; }
}
@media (max-width: 720px) {
  .wrap {
    padding-left: max(16px, env(safe-area-inset-left, 0px));
    padding-right: max(16px, env(safe-area-inset-right, 0px));
  }
  .page { grid-template-columns: minmax(0, 1fr); gap: 2.5rem; padding-block: 2rem 3.5rem; }
  .author {
    position: static;
    grid-template-columns: 7rem minmax(0, 1fr);
    align-items: start;
    gap: 0.75rem 1.25rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--rule);
  }
  .author .portrait { grid-row: span 2; }
  .portrait .monogram { font-size: 2.5rem; }
  .author .cv-wrap { grid-column: 2; }
  .wordmark .full { display: none; }
  .nav { gap: 0; }
  .nav a { padding: 0.4rem 0.45rem; }
  .nav a[href$="#about"] { display: none; }
  .course { grid-template-columns: minmax(0, 1fr); gap: 0.25rem; }
  section + section { margin-top: 3.5rem; }
}
@media (min-width: 721px) {
  .wordmark .short { display: none; }
}

@media print {
  .site-header, .theme-toggle, .toggles, .copy, .skip { display: none !important; }
  .panel[hidden] { display: block !important; }
  .page { grid-template-columns: 1fr; }
  .author { position: static; }
}
@media (max-width: 380px) {
  .wordmark { display: none; }
  .site-header .wrap { justify-content: flex-end; }
}

/* ---------- 404 ---------- */
.notfound { padding-block: 6rem 8rem; }
.notfound .role { margin-bottom: 1.5rem; }