/* ---------- Fonts (self-hosted, Latin only; CJK falls back to system) ---------- */
@font-face { font-family: "Inter"; font-style: normal; font-weight: 400; font-display: swap;
  src: url("../assets/fonts/inter-latin-400-normal.woff2") format("woff2"); }
@font-face { font-family: "Inter"; font-style: normal; font-weight: 500; font-display: swap;
  src: url("../assets/fonts/inter-latin-500-normal.woff2") format("woff2"); }
@font-face { font-family: "Inter"; font-style: normal; font-weight: 600; font-display: swap;
  src: url("../assets/fonts/inter-latin-600-normal.woff2") format("woff2"); }
@font-face { font-family: "Newsreader"; font-style: italic; font-weight: 400; font-display: swap;
  src: url("../assets/fonts/newsreader-latin-400-italic.woff2") format("woff2"); }

/* ---------- Tokens ---------- */
:root {
  --bg: #f6f3e6;
  --text: #5a5650;
  --text-strong: #181818;
  --muted: #6f6a5f;
  --serif-muted: #726d62;
  --rule: #e2dfd4;
  --link: #3f6a8f;
  --accent: #F15A29;
  --label-bg: #181818;
  --label-fg: #f6f3e6;
  --photo-filter: grayscale(.6) sepia(.2) contrast(.95);
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Microsoft JhengHei", "Noto Sans TC", "Helvetica Neue", Arial, sans-serif;
  --serif-italic: "Newsreader", Georgia, "Times New Roman", "Noto Serif TC", serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1d1b17;
    --text: #cfc8b8;
    --text-strong: #f1ecdd;
    --muted: #8f8878;
    --serif-muted: #9a937f;
    --rule: #33302a;
    --link: #9dbbd6;
    --label-bg: #f1ecdd;
    --label-fg: #1d1b17;
    --photo-filter: grayscale(.6) sepia(.2) brightness(.75);
  }
}

/* ---------- Language switching ---------- */
[data-lang="en"] [lang="zh-Hant"] { display: none !important; }
[data-lang="zh"] [lang="en"] { display: none !important; }
/* CJK has no italic: keep zh text upright and on the sans stack inside serif-italic contexts. */
[lang="zh-Hant"] { font-style: normal; }
:is(.muted-serif, .headline, .updates time, .pub-venue, .pub-note) [lang="zh-Hant"] { font-family: var(--sans); }

/* ---------- Base ---------- */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.65;
}
a { color: var(--link); text-decoration: none; }
a:hover, a:focus-visible { color: var(--accent); text-decoration: underline; text-underline-offset: .15em; }
h1, h2, h3 { color: var(--text-strong); font-weight: 600; line-height: 1.25; }
h1 { font-size: 1.75rem; margin: 1.25rem 0 .25rem; letter-spacing: -.01em; }
h2 { font-size: 1rem; margin: 2.75rem 0 1rem; }
p { margin: 0 0 1rem; }
img { max-width: 100%; height: auto; display: block; }
button { font: inherit; }

.site-header, .site-main, .site-footer {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}
@media (max-width: 480px) {
  .site-header, .site-main, .site-footer { padding-left: 16px; padding-right: 16px; }
}

/* ---------- Header ---------- */
.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .75rem 1.5rem;
  padding-top: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--rule);
}
.brand { display: inline-flex; align-items: center; gap: .75rem; color: var(--text-strong); }
.brand:hover { color: var(--text-strong); text-decoration: none; }
.brand-mark { display: inline-flex; width: 44px; color: var(--text-strong); }
.brand-mark svg { width: 100%; height: auto; }
.brand-name { font-weight: 600; letter-spacing: .12em; text-transform: uppercase; font-size: .85rem; }
.brand-name [lang="zh-Hant"] { letter-spacing: .3em; font-size: 1rem; }
.site-nav { display: flex; align-items: center; gap: 1.25rem; font-size: .85rem; letter-spacing: .1em; text-transform: uppercase; }
.site-nav a { color: var(--muted); }
.site-nav a[aria-current="page"] { color: var(--text-strong); }
.site-nav a:hover { color: var(--accent); text-decoration: none; }
.lang-toggle {
  background: none; border: 1px solid var(--rule); border-radius: 999px;
  color: var(--muted); cursor: pointer; padding: .15rem .7rem; letter-spacing: .05em; text-transform: none;
}
.lang-toggle:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- Main / footer ---------- */
.site-main { padding-top: 1.5rem; padding-bottom: 4rem; }
.site-footer {
  display: flex; flex-wrap: wrap; gap: 1.25rem; align-items: center;
  padding-top: 1.25rem; padding-bottom: 2.5rem;
  border-top: 1px solid var(--rule);
  font-size: .8rem; letter-spacing: .05em; color: var(--muted);
}
.site-footer__copy { margin-left: auto; }

/* ---------- Signature pieces ---------- */
.label {
  display: inline-block;
  background: var(--label-bg);
  color: var(--label-fg);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
  padding: .2em .55em .15em;
}
.muted-serif, .headline, .updates time, .pub-venue, .pub-note { font-family: var(--serif-italic); font-style: italic; color: var(--serif-muted); }
.muted-serif { font-size: 1.05rem; }
.photo {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 3px;
  filter: var(--photo-filter);
}
.photo--hero { height: 220px; }
.photo--ribbon { height: 120px; }
@media (max-width: 480px) {
  .photo--hero { height: 160px; }
  .photo--ribbon { height: 90px; }
}

/* ---------- Home ---------- */
.about { display: grid; grid-template-columns: 1fr; gap: 0 2rem; margin-top: 1.5rem; }
.about:has(.portrait) { grid-template-columns: 1fr 160px; }
.about .portrait { grid-column: 2; grid-row: 1 / span 3; width: 160px; height: 160px; object-fit: cover; border-radius: 50%; filter: var(--photo-filter); margin-top: 1.5rem; }
@media (max-width: 600px) {
  .about:has(.portrait) { grid-template-columns: 1fr; }
  .about .portrait { grid-column: 1; grid-row: auto; margin-top: 0; }
}
.headline { font-size: 1.15rem; margin-bottom: 1.25rem; }
.about-name-zh { font-size: 1rem; color: var(--muted); font-weight: 500; letter-spacing: .15em; margin-left: .5rem; }

.updates { list-style: none; margin: 0; padding: 0; }
.updates li { display: grid; grid-template-columns: 6.5rem 1fr; gap: .5rem 1rem; padding: .6rem 0; border-top: 1px solid var(--rule); }
.updates li:last-child { border-bottom: 1px solid var(--rule); }
.updates time { font-size: .95rem; padding-top: .1rem; white-space: nowrap; }
@media (max-width: 480px) {
  .updates li { grid-template-columns: 1fr; gap: 0; }
}

/* ---------- Publications ---------- */
.pubs { list-style: none; margin: 0; padding: 0; }
.pubs li { padding: .55rem 0; border-top: 1px solid var(--rule); }
.pubs li:last-child { border-bottom: 1px solid var(--rule); }
.pub-title { color: var(--text-strong); font-weight: 500; }
.pub-authors { color: var(--text); }