/* ---------------------------------------------------------------------------
   Everything visual lives in this one file. Tweak the variables below first —
   most of the site's look is downstream of them.
   --------------------------------------------------------------------------- */

:root {
  --measure: 52rem;          /* text column width — raise it for narrower page margins */
  --photo: 300px;            /* profile picture width on the About page */
  --fg: #1a1a1a;
  --bg: #ffffff;
  --muted: #666666;
  --link: #14507d;
  --rule: #e0e0e0;
  --code-bg: #f5f5f3;
  --font-body: "Palatino Linotype", Palatino, "Iowan Old Style", Georgia, serif;
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e4e2dd;
    --bg: #16181a;
    --muted: #9a9a95;
    --link: #7fb2d8;
    --rule: #33373a;
    --code-bg: #202325;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  padding: 2.5rem 1.25rem 4rem;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.6;
}

.content, .site-header, .site-footer { max-width: var(--measure); margin: 0 auto; }

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

.site-header {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  align-items: baseline;
  justify-content: space-between;
  padding-bottom: 0.6rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--rule);
}

.site-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--fg);
  text-decoration: none;
}

.site-nav { font-family: var(--font-ui); font-size: 0.9rem; }
.site-nav a { margin-left: 1.1rem; }
.site-nav a:first-child { margin-left: 0; }
.site-nav a.current { color: var(--fg); text-decoration: none; border-bottom: 1px solid var(--muted); }

/* --- typography ------------------------------------------------------------ */

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

h1, h2, h3, h4 { line-height: 1.25; font-weight: 600; }
h1 { font-size: 1.7rem; margin: 0 0 1.2rem; }
h2 { font-size: 1.3rem; margin: 2.2rem 0 0.7rem; }
h3 { font-size: 1.1rem; margin: 1.8rem 0 0.5rem; }

p, ul, ol { margin: 0 0 1.1rem; }
ul, ol { padding-left: 1.4rem; }
li { margin-bottom: 0.3rem; }

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

blockquote {
  margin: 1.2rem 0;
  padding-left: 1rem;
  border-left: 2px solid var(--rule);
  color: var(--muted);
}

code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--code-bg);
  padding: 0.1em 0.3em;
  border-radius: 3px;
}

pre {
  background: var(--code-bg);
  padding: 0.9rem 1rem;
  border-radius: 4px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.45;
}
pre code { background: none; padding: 0; font-size: inherit; }

table { border-collapse: collapse; width: 100%; font-size: 0.95rem; margin-bottom: 1.2rem; display: block; overflow-x: auto; }
th, td { text-align: left; padding: 0.4rem 0.7rem 0.4rem 0; border-bottom: 1px solid var(--rule); }

.muted, .post-meta { color: var(--muted); font-family: var(--font-ui); font-size: 0.85rem; }

/* --- about page ------------------------------------------------------------ */

.profile {
  display: flex;
  flex-wrap: wrap;
  gap: 1.75rem;
  align-items: flex-start;
  margin-bottom: 2.2rem;
}
.profile img {
  width: var(--photo);
  height: auto;
  border-radius: 3px;
  flex-shrink: 0;
}

/* the column beside the photo: name, intro, links, research interests */
.profile .intro { flex: 1 1 17rem; margin: 0; }
.profile .intro > :first-child { margin-top: 0; }
.profile .intro > :last-child { margin-bottom: 0; }
.profile .intro h1 { margin-bottom: 0.4rem; }
.profile .intro h2 { margin-top: 1.5rem; }

@media (max-width: 34rem) {
  .profile img { width: 60%; }        /* stacked layout — don't let it dominate */
}

.links { font-family: var(--font-ui); font-size: 0.95rem; list-style: none; padding: 0; margin: 0 0 1rem; }
.links li { margin-bottom: 0.3rem; }
.links .label { display: inline-block; min-width: 6.5rem; color: var(--muted); }

/* --- friends: multi-column list ------------------------------------------- */

.friends ul {
  columns: 2;
  column-gap: 2rem;
  padding-left: 1.4rem;
  margin: 0;
}
.friends li { break-inside: avoid; }

@media (max-width: 30rem) {
  .friends ul { columns: 1; }
}

/* --- post list ------------------------------------------------------------- */

.post-list { list-style: none; padding: 0; }
.post-list li { margin-bottom: 1.4rem; }
.post-list .title { font-size: 1.05rem; }
.post-list .summary { display: block; color: var(--muted); font-size: 0.95rem; }

/* --- posts: figures, abstract, math ---------------------------------------- */

.abstract {
  font-size: 0.95rem;
  border-left: 2px solid var(--rule);
  padding-left: 1rem;
  margin-bottom: 2rem;
}
.abstract p:last-child { margin-bottom: 0; }

.figure { margin: 2rem 0; text-align: center; }
.figure img, .post img { max-width: 100%; height: auto; border-radius: 2px; }
.figure figcaption, .post p > img + em {
  display: block;
  margin-top: 0.6rem;
  font-family: var(--font-ui);
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--muted);
  text-align: left;
}
@media (prefers-color-scheme: dark) {
  /* most plots are exported on white — keep them readable on a dark page */
  .figure img, .post img { background: #fff; padding: 0.4rem; }
}

/* long display equations scroll instead of widening the page */
mjx-container[jax="CHTML"][display="true"] { overflow-x: auto; overflow-y: hidden; padding: 0.2rem 0; }

.footnotes { font-size: 0.9rem; color: var(--muted); border-top: 1px solid var(--rule); padding-top: 1rem; }

.back { font-family: var(--font-ui); font-size: 0.9rem; margin-top: 3rem; }

/* --- poetry ---------------------------------------------------------------- */

.poem {
  white-space: pre-wrap;       /* line breaks in the source are line breaks on the page */
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  margin: 0;
}
.poem-title { font-size: 1.1rem; margin: 0 0 0.1rem; }
.poem-meta { color: var(--muted); font-family: var(--font-ui); font-size: 0.8rem; margin: 0 0 0.75rem; }

.poem-entry { margin: 2.2rem 0; }

/* With JS on, exactly one poem is shown; with it off, all of them are. */
.js .poem-entry { display: none; }
.js .poem-entry.is-shown { display: block; }

.poem-nav { font-family: var(--font-ui); font-size: 0.85rem; margin-top: 2.5rem; }
.poem-nav[hidden] { display: none; }

/* --- footer ---------------------------------------------------------------- */

.site-footer {
  margin-top: 4rem;
  padding-top: 0.8rem;
  border-top: 1px solid var(--rule);
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--muted);
}
.site-footer a { color: var(--muted); }
.site-footer span { margin-right: 0.35rem; }