/* Site styles. Served as /assets/site.css (assets/site.css includes this file) and linked
   from _includes/head.html. One accent colour (--accent) plus neutrals; dark mode only
   swaps the tokens. One typeface for Korean and Latin text: Pretendard, self-hosted in
   assets/fonts/pretendard/ (its @font-face rules are linked before this file). */
:root {
  --bg: #fdfdfb; --fg: #1d2127; --muted: #575e69; --accent: #1f4e8c;
  --rule: #e1e1db; --tint: #eef2f8;
  --sans: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont, system-ui, Roboto,
    "Helvetica Neue", "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", sans-serif;
  --measure: 45rem;   /* text column (about 90-95 characters of body text) */
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181c; --fg: #e4e4df; --muted: #a4abb6; --accent: #93bbef;
    --rule: #2d3138; --tint: #1e2632;
  }
}

/* Base */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 1rem/1.65 var(--sans);
  overflow-wrap: break-word; word-break: keep-all;
}
h2 {
  margin: 1.5rem 0 .8rem; padding-bottom: .25rem; border-bottom: 1px solid var(--rule);
  font-size: 1.15em; line-height: 1.3; letter-spacing: -.01em;
}
h3 { margin: 1.2rem 0 .4rem; font-size: 1em; }
p { margin: 0 0 .8rem; text-wrap: pretty; }
b, strong { font-weight: 600; }   /* one emphasis weight; 700 is kept for .name and h2 */

/* Links are always underlined, so they never rely on colour alone */
a {
  color: var(--accent); text-decoration: underline; text-decoration-thickness: 1px;
  text-underline-offset: .18em;
  text-decoration-color: color-mix(in srgb, currentColor 55%, transparent);
}
a:hover { text-decoration-color: currentColor; text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }
.skip {
  position: absolute; left: 1rem; top: -4rem; z-index: 1; padding: .4rem .8rem;
  background: var(--bg); border: 2px solid var(--accent); border-radius: 4px;
}
.skip:focus { top: .75rem; }
.vh {
  position: absolute; width: 1px; height: 1px; overflow: hidden; white-space: nowrap;
  clip: rect(0 0 0 0); clip-path: inset(50%);
}

/* Layout: one column with a 1rem gutter on phones */
.wrap { width: min(100% - 2rem, var(--measure)); margin: 0 auto; }

/* Header: photo, name, role lines, section links */
.top { padding-top: 1.25rem; }
.who { display: flex; align-items: center; gap: 1rem; }
.who picture { flex: none; }
.avatar {
  display: block; width: 64px; height: 64px; border-radius: 50%;
  background: var(--tint); box-shadow: 0 0 0 1px var(--rule);
}
.name {
  margin: 0; font-size: clamp(1.5rem, 7.5vw, 1.75rem); font-weight: 700; line-height: 1.15;
  letter-spacing: -.02em;
}
.nk { font-size: .66em; font-weight: 400; letter-spacing: 0; color: var(--muted); white-space: nowrap; }
.role { margin: .2rem 0 0; color: var(--muted); font-size: .9em; line-height: 1.4; }
.role + .role { margin-top: .05rem; }
.toc { margin-top: .875rem; border-block: 1px solid var(--rule); }
.toc ul {
  list-style: none; margin: 0; padding: .35rem 0;
  display: flex; flex-wrap: wrap; gap: .1rem 1.1rem;
}
.toc a { display: inline-block; padding: .15rem 0; }

/* About */
.bio { margin-top: .75rem; }
.links {
  list-style: none; margin: 0; padding: 0;
  display: flex; flex-wrap: wrap; gap: .2rem 1.25rem;
}

/* Lists shared by news, publications and dated rows */
.news, .pubs, .cv { list-style: none; margin: 0; padding: 0; }
.when, time { color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }
.sub { display: block; color: var(--muted); font-size: .94em; text-wrap: pretty; }
.note { margin: .9rem 0 0; color: var(--muted); font-size: .875em; }
.nw { white-space: nowrap; }

/* News: date column sized by its content (subgrid keeps rows aligned) */
.news { display: grid; grid-template-columns: max-content 1fr; gap: .3rem 1rem; }
.news li { grid-column: 1 / -1; display: grid; grid-template-columns: subgrid; }
.more { margin-top: .35rem; }
.more summary { cursor: pointer; color: var(--muted); width: fit-content; }
.more summary:hover { color: var(--accent); }
.more[open] summary { margin-bottom: .4rem; }
.more .news { margin-top: .3rem; }

/* Publications: venue badge, title, authors, venue, award, links */
.pubs { display: grid; gap: 1.1rem 1rem; }
.pubs li { display: grid; gap: .3rem 1rem; align-items: start; }
.badge {
  justify-self: start; margin-top: .15rem; padding: .2em .5em .15em;
  font: 600 .875em/1.25 var(--sans); letter-spacing: .01em; white-space: nowrap;
  color: var(--accent); background: var(--tint);
  border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent); border-radius: 3px;
}
.pub p { margin: 0; }
.ptitle { margin: 0; font-size: 1em; font-weight: 600; line-height: 1.45; text-wrap: balance; }
.pa, .venue { font-size: .94em; }
.venue { color: var(--muted); }
/* Award: tinted ribbon with an accent rule and star (the one accent colour, not a second hue) */
.award {
  width: fit-content; max-width: 100%; padding: .1em .6em .12em .5em;
  font-size: .94em; background: var(--tint); border-left: 3px solid var(--accent);
  border-radius: 0 3px 3px 0;
}
.pub .award { margin-top: .3rem; }
.award b { color: var(--accent); }
.award::before { content: "\2605\00a0"; content: "\2605\00a0" / ""; color: var(--accent); }
/* Single decorative symbols: a system font draws them, so no extra Pretendard subset is fetched */
.award::before, .back [aria-hidden] { font-family: system-ui, -apple-system, "Segoe UI", sans-serif; }
.plinks { padding-top: .15rem; color: var(--muted); }
.lk { white-space: nowrap; margin-right: .3rem; }

/* Dated rows (patents, service, education, honors, earlier): date label on top on phones */
.cv li { display: flex; flex-direction: column; margin: 0 0 .75rem; }
.cv .when {
  order: -1; font-size: .875em; font-weight: 600;
  line-height: 1.5; letter-spacing: .02em;
}

/* Subpages */
.back { margin: 0 0 .6rem; font-size: .9em; }
.pg { margin-top: 1.25rem; }
.art { margin: 1.5rem 0; }
.art img {
  display: block; max-width: 100%; height: auto;
  background: #fff; border-radius: 4px; box-shadow: 0 0 0 1px var(--rule);
}
.art img.px { width: 100%; image-rendering: pixelated; }
.art figcaption { margin-top: .5rem; color: var(--muted); font-size: .9em; }
.cal {
  display: block; width: 100%; height: clamp(24rem, 72vh, 42rem);
  border: 1px solid var(--rule); border-radius: 4px; background: var(--tint);
}

/* Footer */
.end {
  margin-top: 3rem; padding: 1rem 0 2.5rem; border-top: 1px solid var(--rule);
  color: var(--muted); font-size: .9em;
}
.end p { margin: 0 0 .3rem; }
.end p[lang="ko"] { text-wrap: balance; }

@media (min-width: 36rem) {
  .who { gap: 1.25rem; }
  .avatar { width: 80px; height: 80px; }
  .name { font-size: 2.1rem; }
  /* News dates and venue badges share one first-column width, so text lines up */
  .news, .pubs { grid-template-columns: minmax(6.25rem, max-content) 1fr; }
  .pubs li { grid-column: 1 / -1; grid-template-columns: subgrid; align-items: baseline; }
  .badge { margin-top: 0; }   /* sits on the title's first baseline */
  .cv li { display: grid; grid-template-columns: 1fr auto; gap: 0 1.5rem; margin-bottom: .55rem; }
  .cv .when {
    order: 0; text-align: right; font-size: 1em; font-weight: 400;
    line-height: inherit; letter-spacing: normal;
  }
}

@media print {
  :root {
    --bg: #fff; --fg: #000; --muted: #333; --accent: #000; --rule: #b5b5b5; --tint: #fff;
    /* An installed static Pretendard prints as real TrueType (smaller PDF, cleaner text
       extraction); without it, printing falls through to the web font as on screen. */
    --sans: Pretendard, "Pretendard Variable", -apple-system, BlinkMacSystemFont, system-ui,
      Roboto, "Helvetica Neue", "Segoe UI", "Apple SD Gothic Neo", "Noto Sans KR",
      "Malgun Gothic", sans-serif;
  }
  @page { size: A4; margin: 14mm 16mm; }
  body { font-size: 10pt; line-height: 1.38; }
  .wrap { width: auto; }
  .noprint, .skip, .back, .lk { display: none; }
  .lk.doi { display: inline; }
  .top { padding: 0 0 .4rem; border-bottom: 1px solid var(--rule); }
  .avatar { width: 52px; height: 52px; box-shadow: none; }
  .name { font-size: 18pt; }
  .bio { margin-top: .8rem; }
  a { color: inherit; text-decoration: none; }
  .links { display: block; }
  .links li { display: inline; }
  .links li + li::before { content: " · "; }
  .links li { white-space: nowrap; }
  .links a[data-p]::after { content: " " attr(data-p); }
  .doi a::after { content: ": " attr(data-doi); }
  h2 { margin: 1rem 0 .45rem; font-size: 11.5pt; break-after: avoid; }
  li, .content { break-inside: avoid; }
  .award { padding: 0 0 0 .45em; background: none; }
  .pubs { gap: .6rem 1rem; }
  .badge { border-color: #777; }
  .end { margin-top: 1rem; padding: .5rem 0 0; }
}