/* ==========================================================================
   Jon A. Chun - personal academic homepage
   Single shared stylesheet. No build step, no framework.
   ========================================================================== */

/* --- Design tokens -------------------------------------------------------- */

:root {
  /* Typography */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    monospace;

  /* Palette - light */
  --bg: #fbfaf8;
  --bg-elevated: #ffffff;
  --bg-subtle: #f3f1ed;
  --text: #1c1b19;
  --text-muted: #5c5851;
  --text-faint: #837e75;
  --border: #e0dcd5;
  --border-strong: #c8c2b8;
  --accent: #7a2e2e;
  --accent-hover: #5d2020;
  --accent-soft: #f5ebe9;
  --link: #1e4f6b;
  --link-hover: #123448;
  --focus: #1e6f9b;

  /* Scale */
  --measure: 68ch;
  --wrap: 72rem;
  --radius: 6px;
  --gutter: 1rem;
  --shadow-sm: 0 1px 2px rgba(28, 27, 25, 0.06);
  --shadow-md: 0 2px 10px rgba(28, 27, 25, 0.07);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14151a;
    --bg-elevated: #1c1e25;
    --bg-subtle: #22242c;
    --text: #e8e6e1;
    --text-muted: #a8a49c;
    --text-faint: #837e75;
    --border: #2e3139;
    --border-strong: #3f434d;
    --accent: #e0a3a3;
    --accent-hover: #f0bcbc;
    --accent-soft: #2a2023;
    --link: #8ec5e3;
    --link-hover: #b3dcf2;
    --focus: #6ab5e0;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 2px 12px rgba(0, 0, 0, 0.45);
  }
}

/* --- Reset ---------------------------------------------------------------- */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-wrap: break-word;
}

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

/* --- Layout --------------------------------------------------------------- */

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

main {
  display: block;
  padding-block: 2.5rem 4rem;
}

section {
  margin-block-end: 3.5rem;
}

section:last-child {
  margin-block-end: 0;
}

.prose {
  max-width: var(--measure);
}

/* --- Skip link ------------------------------------------------------------ */

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  padding: 0.75rem 1.25rem;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  border-radius: 0 0 var(--radius) 0;
}

.skip-link:focus {
  left: 0;
}

/* --- Typography ----------------------------------------------------------- */

h1,
h2,
h3,
h4 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.22;
  letter-spacing: -0.012em;
  margin-block: 0 0.6em;
  text-wrap: balance;
}

h1 {
  font-size: clamp(1.9rem, 1.3rem + 2.6vw, 2.9rem);
}

h2 {
  font-size: clamp(1.4rem, 1.15rem + 1.1vw, 1.85rem);
  padding-block-end: 0.35rem;
  border-block-end: 1px solid var(--border);
}

h3 {
  font-size: clamp(1.1rem, 1rem + 0.5vw, 1.3rem);
}

h4 {
  font-size: 1.02rem;
  font-family: var(--font-sans);
  font-weight: 650;
}

p {
  margin-block: 0 1.1em;
}

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.16em;
}

a:hover {
  color: var(--link-hover);
}

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

small,
.small {
  font-size: 0.875rem;
}

.muted {
  color: var(--text-muted);
}

.faint {
  color: var(--text-faint);
}

.lede {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: var(--measure);
}

code,
kbd {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-subtle);
  padding: 0.12em 0.36em;
  border-radius: 3px;
}

blockquote {
  margin: 0 0 1.1em;
  padding-inline-start: 1rem;
  border-inline-start: 3px solid var(--border-strong);
  color: var(--text-muted);
  font-style: italic;
}

hr {
  border: 0;
  border-block-start: 1px solid var(--border);
  margin-block: 2.5rem;
}

/* --- Site header / nav ---------------------------------------------------- */

.site-header {
  background: var(--bg-elevated);
  border-block-end: 1px solid var(--border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 3.75rem;
}

.brand {
  font-family: var(--font-serif);
  font-size: 1.06rem;
  font-weight: 650;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.brand:hover {
  color: var(--accent);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.45rem;
  background: transparent;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  color: var(--text);
  font: inherit;
  font-size: 0.9rem;
  padding: 0.45rem 0.7rem;
  cursor: pointer;
}

.nav-toggle__bars {
  display: inline-block;
  width: 1rem;
  height: 2px;
  background: currentColor;
  position: relative;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
}

.nav-toggle__bars::before {
  top: -5px;
}

.nav-toggle__bars::after {
  top: 5px;
}

.site-nav ul {
  display: flex;
  gap: 0.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  display: block;
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.945rem;
  font-weight: 500;
}

.site-nav a:hover {
  background: var(--bg-subtle);
  color: var(--text);
}

.site-nav a[aria-current="page"] {
  color: var(--accent);
  font-weight: 650;
  background: var(--accent-soft);
}

@media (min-width: 48rem) {
  .site-header {
    position: sticky;
    top: 0;
    z-index: 20;
  }
}

@media (max-width: 47.99rem) {
  .nav-toggle {
    display: inline-flex;
  }
  .site-nav {
    display: none;
    width: 100%;
  }
  .site-header__inner {
    flex-wrap: wrap;
    padding-block: 0.6rem;
  }
  .site-nav.is-open {
    display: block;
  }
  .site-nav ul {
    flex-direction: column;
    gap: 0;
    padding-block: 0.4rem 0.2rem;
  }
  .site-nav a {
    padding-block: 0.6rem;
  }
}

/* --- Hero ----------------------------------------------------------------- */

.hero {
  padding-block: 3rem 1rem;
}

.hero__grid {
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  gap: 2rem;
  align-items: start;
}

.hero__avatar {
  width: 8.5rem;
  height: 8.5rem;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-md);
}

.hero__kicker {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.045em;
  text-transform: uppercase;
  color: var(--accent);
  margin-block: 0 0.5rem;
}

.hero h1 {
  margin-block-end: 0.35rem;
}

.hero__role {
  font-size: 1.14rem;
  color: var(--text-muted);
  margin-block-end: 1.1rem;
}

@media (max-width: 40rem) {
  .hero {
    padding-block: 2rem 0.5rem;
  }
  .hero__grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
  .hero__avatar {
    width: 6.5rem;
    height: 6.5rem;
  }
}

/* --- Link rows ------------------------------------------------------------ */

.linkrow {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
}

.linkrow a {
  display: inline-block;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
}

.linkrow a:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

/* --- Highlight strip ------------------------------------------------------ */

.highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(13rem, 100%), 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  list-style: none;
  margin: 0;
  padding: 0;
}

.highlights li {
  background: var(--bg-elevated);
  padding: 1.1rem 1.15rem;
}

.highlights b {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 650;
  line-height: 1.1;
  color: var(--accent);
  margin-block-end: 0.3rem;
}

.highlights span {
  display: block;
  font-size: 0.895rem;
  color: var(--text-muted);
  line-height: 1.45;
}

/* --- Cards ---------------------------------------------------------------- */

/* min() keeps the track floor from exceeding the container on narrow phones,
   where a fixed minmax() floor plus padding would force a page-wide scroll. */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(17rem, 100%), 1fr));
  gap: 1.15rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.cards--wide {
  grid-template-columns: repeat(auto-fit, minmax(min(20rem, 100%), 1fr));
}

.card {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.card h3 {
  margin-block-end: 0;
}

.card h3 a {
  text-decoration: none;
}

.card h3 a:hover {
  text-decoration: underline;
}

.card p {
  margin-block-end: 0;
  font-size: 0.945rem;
  color: var(--text-muted);
}

.card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.75rem;
  margin-block-start: auto;
  padding-block-start: 0.5rem;
  font-size: 0.83rem;
  color: var(--text-faint);
}

.tag {
  display: inline-block;
  padding: 0.1rem 0.5rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  font-size: 0.78rem;
  color: var(--text-muted);
  white-space: nowrap;
}

/* --- Focus areas ---------------------------------------------------------- */

.focus-areas {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(15rem, 100%), 1fr));
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.focus-areas h3 {
  padding-block-end: 0.4rem;
  border-block-end: 2px solid var(--accent);
  margin-block-end: 0.6rem;
}

.focus-areas p {
  margin-block-end: 0;
  color: var(--text-muted);
  font-size: 0.96rem;
}

/* --- Entry lists (publications, roles, press) ----------------------------- */

.entries {
  list-style: none;
  margin: 0;
  padding: 0;
}

.entries > li {
  padding-block: 1.1rem;
  border-block-end: 1px solid var(--border);
  max-width: var(--measure);
}

.entries > li:first-child {
  padding-block-start: 0.3rem;
}

.entries > li:last-child {
  border-block-end: 0;
}

.entry__title {
  font-family: var(--font-serif);
  font-size: 1.07rem;
  font-weight: 600;
  line-height: 1.35;
  margin-block: 0 0.3rem;
}

.entry__venue {
  display: block;
  font-size: 0.885rem;
  color: var(--text-faint);
  margin-block-end: 0.45rem;
}

.entry__abstract {
  margin-block-end: 0;
  font-size: 0.945rem;
  color: var(--text-muted);
}

/* Compact bullet list */
.tight {
  max-width: var(--measure);
  padding-inline-start: 1.2rem;
}

.tight li {
  margin-block-end: 0.5rem;
}

/* --- Timeline ------------------------------------------------------------- */

.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: var(--measure);
}

.timeline li {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 1rem;
  padding-block: 0.7rem;
  border-block-end: 1px solid var(--border);
}

.timeline li:last-child {
  border-block-end: 0;
}

.timeline time,
.timeline .when {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
}

.timeline p {
  margin: 0;
  font-size: 0.95rem;
}

@media (max-width: 34rem) {
  .timeline li {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }
}

/* --- Tables --------------------------------------------------------------- */

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.93rem;
}

caption {
  text-align: left;
  font-size: 0.885rem;
  color: var(--text-faint);
  padding-block-end: 0.6rem;
}

th,
td {
  text-align: left;
  vertical-align: top;
  padding: 0.6rem 0.7rem;
  border-block-end: 1px solid var(--border);
}

thead th {
  font-size: 0.815rem;
  font-weight: 650;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--text-faint);
  border-block-end: 1px solid var(--border-strong);
}

tbody tr:last-child th,
tbody tr:last-child td {
  border-block-end: 0;
}

/* Phones: reflow each row into a stacked block using data-label. */
@media (max-width: 40rem) {
  table.stack thead {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }
  table.stack tbody tr {
    display: block;
    padding-block: 0.75rem;
    border-block-end: 1px solid var(--border);
  }
  table.stack tbody tr:last-child {
    border-block-end: 0;
  }
  table.stack tbody th,
  table.stack tbody td {
    display: block;
    padding: 0.1rem 0;
    border: 0;
  }
  table.stack tbody td[data-label]::before {
    content: attr(data-label) ": ";
    font-weight: 650;
    color: var(--text-faint);
  }
  table.stack tbody th {
    font-size: 1rem;
    font-weight: 650;
    padding-block-end: 0.25rem;
  }
}

/* --- Figures -------------------------------------------------------------- */

figure {
  margin: 1.75rem 0;
}

figure img {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
}

figcaption {
  margin-block-start: 0.6rem;
  font-size: 0.865rem;
  color: var(--text-faint);
  max-width: var(--measure);
}

.figure-pair {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(18rem, 100%), 1fr));
  gap: 1.5rem;
}

.figure-pair figure {
  margin: 0;
}

.logo-inline {
  max-width: 13rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem;
  background: var(--bg-elevated);
}

/* --- Repository listing --------------------------------------------------- */

.repo-groups {
  display: grid;
  gap: 2.5rem;
}

/* Grid items default to min-width:auto, so a single long repository name
   sets a min-content floor that pushes the track wider than the container
   and scrolls the whole page on a phone. Let the track shrink instead. */
.repo-group {
  min-width: 0;
}

.repo-group h3 {
  padding-block-end: 0.35rem;
  border-block-end: 1px solid var(--border-strong);
}

.repo-count {
  display: inline-block;
  margin-inline-start: 0.4rem;
  padding: 0.05rem 0.5rem;
  border-radius: 999px;
  background: var(--bg-subtle);
  color: var(--text-faint);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  vertical-align: 0.15em;
}

.repo-list {
  list-style: none;
  margin: 0;
  padding: 0;
  columns: 2;
  column-gap: 2rem;
}

.repo-list li {
  break-inside: avoid;
  padding-block: 0.5rem;
  margin-block-end: 0.35rem;
  font-size: 0.92rem;
}

.repo-list > li > a {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 500;
  /* Repository names are long, hyphen-joined and unbreakable by default. */
  overflow-wrap: anywhere;
}

.repo-desc {
  display: block;
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.45;
  margin-block-start: 0.1rem;
}

.repo-meta {
  display: block;
  margin-block-start: 0.2rem;
  font-size: 0.79rem;
  color: var(--text-faint);
}

.repo-lang + .repo-stars::before {
  content: "\00b7";
  margin-inline: 0.35rem;
}

@media (max-width: 52rem) {
  .repo-list {
    columns: 1;
  }
}

/* --- Callout -------------------------------------------------------------- */

.callout {
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-inline-start: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.15rem 1.25rem;
  max-width: var(--measure);
}

.callout > :last-child {
  margin-block-end: 0;
}

.callout h3 {
  margin-block-end: 0.4rem;
}

/* --- Footer --------------------------------------------------------------- */

.site-footer {
  border-block-start: 1px solid var(--border);
  background: var(--bg-elevated);
  padding-block: 2.25rem;
  margin-block-start: 3rem;
}

.site-footer h2 {
  font-size: 0.815rem;
  font-family: var(--font-sans);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-faint);
  border: 0;
  padding: 0;
  margin-block-end: 0.75rem;
}

.site-footer ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  font-size: 0.92rem;
}

.site-footer__meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  font-size: 0.865rem;
  color: var(--text-faint);
  border-block-start: 1px solid var(--border);
  padding-block-start: 1.25rem;
  margin: 0;
}

.site-footer__meta p {
  margin: 0;
}

/* --- Utilities ------------------------------------------------------------ */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.center {
  text-align: center;
}

/* Error page */
.errorpage {
  padding-block: 5rem 4rem;
  text-align: center;
}

.errorpage h1 {
  margin-block-end: 0.5rem;
}

.errorpage .linkrow {
  justify-content: center;
}