/* ==========================================================================
   Guhnoo Yun — academic homepage
   Design language: Minimal-Light / knightnemo lineage
   (fixed sidebar + scrolling content, Lato, navy headings, orange underline)
   All content lives in assets/js/data.js — this file is style only.
   ========================================================================== */

:root {
  --bg: #ffffff;
  --text: #595959;
  --text-strong: #222222;
  --text-light: #6f6f6f;
  --heading: #043361;
  --accent: #fba524;
  --accent-strong: #c47600;
  --link: #006699;
  --link-hover: #004d73;
  --theme: #002d72;
  --selected-bg: #eaf4ff;
  --note-red: #e74d3c;
  --border: #e5e5e5;
  --box-bg: #f8f9fa;
  --box-border: #e9ecef;
  --btn-fg: #000000;
  --btn-border: #000000;
  --code-bg: #f8f8f8;
  --shadow: rgba(0, 0, 0, 0.35);
  --ghost: #e0e0e0;
}

html[data-theme="dark"] {
  --bg: #20212b;
  --text: #dadbdf;
  --text-strong: #ffffff;
  --text-light: #9a9ba5;
  --heading: #3eb7f0;
  --accent: #fba524;
  --accent-strong: #fba524;
  --link: #3eb7f0;
  --link-hover: #7fd0f5;
  --theme: rgb(36, 150, 203);
  --selected-bg: rgba(36, 150, 203, 0.22);
  --note-red: #ff6f61;
  --border: #3a3b47;
  --box-bg: #262733;
  --box-border: #34353f;
  --btn-fg: #dadbdf;
  --btn-border: #6a6b75;
  --code-bg: #262733;
  --shadow: rgba(0, 0, 0, 0.6);
  --ghost: #3a3b47;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background-color: var(--bg);
  color: var(--text);
  font: 16px/1.6 "Lato", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* ---------- layout: fixed sidebar + scrolling content ---------- */

.wrapper {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  gap: 56px;
}

.sidebar {
  width: 232px;
  flex: 0 0 232px;
  position: sticky;
  top: 0;
  align-self: flex-start;
  max-height: 100vh;
  overflow-y: auto;
  padding: 4em 0 2em;
  text-align: center;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.sidebar::-webkit-scrollbar { width: 6px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }

.content {
  flex: 1 1 auto;
  min-width: 0;
  padding: 4em 0 50px;
}

/* ---------- sidebar ---------- */

.avatar {
  width: 148px;
  height: 148px;
  border-radius: 100%;
  object-fit: cover;
  margin: 0 auto 1em;
  display: block;
  box-shadow: 0 2px 10px var(--shadow);
}

.sidebar h1 {
  font-size: 26px;
  font-weight: 700;
  color: var(--heading);
  margin: 0 0 4px;
  line-height: 1.2;
}

.sidebar .position {
  font-size: 1.02rem;
  color: var(--text-strong);
  margin: 0 0 2px;
}

.sidebar .affiliation {
  font-size: 0.95rem;
  margin: 0 0 8px;
}
.sidebar .affiliation a { color: var(--text); }
.sidebar .affiliation a:hover { color: var(--link-hover); }

.sidebar .email {
  font-family: "Ubuntu Mono", Menlo, Consolas, monospace;
  font-size: 13.5px;
  color: var(--text-light);
  word-break: break-all;
}
.sidebar .email a { color: inherit; text-decoration: none; }
.sidebar .email a:hover { color: var(--link-hover); }

.social-icons {
  margin: 18px 0 10px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px;
}

.social-icons a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 100%;
  color: var(--heading);
  transition: all 0.3s ease;
}
.social-icons a:hover {
  transform: scale(1.2);
  color: var(--accent-strong);
}
.social-icons svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: currentColor;
}

.side-nav {
  margin: 14px 0 0;
  padding: 14px 28px 0;
  border-top: 1px solid var(--border);
  list-style: none;
  font-size: 14.5px;
}
.side-nav li { margin: 5px 0; }
.side-nav a {
  color: var(--text);
  text-decoration: none;
}
.side-nav a:hover { color: var(--link-hover); }
.side-nav a.active { color: var(--heading); font-weight: 700; }

.theme-toggle {
  margin-top: 18px;
  background: none;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  font: inherit;
  font-size: 13px;
  padding: 5px 14px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.theme-toggle:hover { border-color: var(--heading); color: var(--heading); }
.theme-toggle svg {
  width: 13px;
  height: 13px;
  fill: currentColor;
  vertical-align: -1.5px;
  margin-right: 5px;
}

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

a { color: var(--link); text-decoration: none; }
a:hover { color: var(--link-hover); text-decoration: underline; }

/* WCAG 1.4.1: links in running text must not rely on color alone */
#about-body a,
#services-body a,
.news-box a,
.entry-body a,
.flat-list a,
.content p a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

strong, b { color: var(--text-strong); font-weight: 700; }

h2 {
  color: var(--heading);
  font-weight: 700;
  font-size: 157%;
  line-height: 1.1;
  margin: 2px 0 15px;
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 3px;
  text-underline-offset: 7px;
}

h3 {
  color: var(--heading);
  font-weight: 600;
  font-size: 118%;
  line-height: 1.2;
  margin: 0 0 10px;
}

section.block { margin-bottom: 44px; }

hr {
  border: 0;
  height: 1px;
  background: var(--border);
  margin: 2em 0;
}

ul { padding-left: 1.3em; }

code, pre {
  font-family: Monaco, Consolas, "Ubuntu Mono", monospace;
  background: var(--code-bg);
  border-radius: 4px;
}
code { padding: 1px 5px; font-size: 0.85em; }

/* ---------- hero action buttons ---------- */

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
}

.btn {
  display: inline-block;
  color: var(--btn-fg);
  border: 1px solid var(--btn-border);
  border-radius: 4px;
  padding: 0.12rem 0.55rem;
  font-size: 12.5px;
  text-decoration: none;
  cursor: pointer;
  background: none;
  font-family: inherit;
  line-height: 1.55;
  transition: color 0.15s ease-in-out, border-color 0.15s ease-in-out;
}
.btn:hover {
  color: var(--theme);
  border-color: var(--theme);
  text-decoration: none;
}
html[data-theme="dark"] .btn:hover {
  color: var(--link-hover);
  border-color: var(--link-hover);
}

/* ---------- news ---------- */

.news-box {
  background: var(--box-bg);
  border: 1px solid var(--box-border);
  border-radius: 8px;
  padding: 16px 20px;
  margin: 16px 0 10px;
}

.news-box ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.news-box li {
  display: flex;
  gap: 14px;
  padding: 5px 0;
  font-size: 15px;
}

.news-date {
  flex: 0 0 76px;
  color: var(--text-light);
  font-size: 13.5px;
  font-family: "Ubuntu Mono", Menlo, monospace;
  padding-top: 1.5px;
  white-space: nowrap;
}

.link-btn {
  background: none;
  border: none;
  color: var(--link);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
  padding: 0;
}
.link-btn:hover { color: var(--link-hover); text-decoration: underline; }

/* ---------- publications ---------- */

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

.pub-list > li {
  margin-bottom: 22px;
  scroll-margin-top: 24px;
}

.pub-row {
  display: flex;
  align-items: center;
  gap: 20px;
  border-radius: 6px;
  padding: 6px 8px;
}

.pub-row-selected { background: var(--selected-bg); }

.pub-thumb {
  position: relative;
  flex: 0 0 190px;
}

.pub-thumb img,
.pub-thumb svg.teaser {
  display: block;
  width: 190px;
  height: 112px;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: 3px 3px 6px var(--shadow);
}

.pub-badge {
  position: absolute;
  top: 8px;
  left: 10px;
  background: var(--theme);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.4px;
  padding: 2px 10px;
  border-radius: 0.125rem;
  border: 1px solid rgba(255, 255, 255, 0.55);
  box-shadow: 0 2px 5px 0 rgb(0 0 0 / 16%), 0 2px 10px 0 rgb(0 0 0 / 12%);
}
html[data-theme="dark"] .pub-badge {
  background: #17587a; /* white text 7.7:1, passes AA at 11px */
}

.pub-main { flex: 1 1 auto; min-width: 0; }

.pub-title {
  font-weight: 700;
  font-size: 16.5px;
  line-height: 1.35;
  margin-bottom: 3px;
}
.pub-title a { color: var(--text-strong); }
.pub-title a:hover { color: var(--link-hover); text-decoration: none; }

.pub-authors {
  font-size: 14.5px;
  margin-bottom: 2px;
}
.pub-authors .me {
  font-weight: 700;
  color: var(--heading);
}

.pub-venue {
  font-size: 14.5px;
  font-style: italic;
  margin-bottom: 6px;
}

.pub-note {
  color: var(--note-red);
  font-weight: 700;
  font-style: italic;
  font-size: 13.5px;
  margin-left: 4px;
}

.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.pub-extra {
  margin-top: 8px;
  font-size: 14px;
  background: var(--box-bg);
  border: 1px solid var(--box-border);
  border-radius: 6px;
  padding: 10px 14px;
  overflow-x: auto;
  max-height: 0;
  opacity: 0;
  visibility: hidden;
  margin-top: 0;
  padding-top: 0;
  padding-bottom: 0;
  border-width: 0;
  transition: max-height 0.2s ease, opacity 0.2s ease;
}
.pub-extra.open {
  max-height: 640px;
  opacity: 1;
  visibility: visible;
  margin-top: 8px;
  padding: 10px 14px;
  border-width: 1px;
}

.pub-extra pre {
  margin: 0 0 8px;
  padding: 0;
  background: none;
  font-size: 12.5px;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
}

/* ---------- publications: Selected | All tabs, year separators ---------- */

.pub-tabs {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 14px;
}

.pub-tab {
  background: none;
  border: none;
  color: var(--text);
  font: inherit;
  font-size: 15px;
  padding: 2px 10px;
  border-radius: 4px;
  cursor: pointer;
}
.pub-tab:hover { color: var(--heading); }
.pub-tab.active {
  background: var(--selected-bg);
  color: var(--heading);
  font-weight: 700;
}

.pub-tab-sep { color: var(--text-light); }

.pub-year {
  list-style: none;
  text-align: right;
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--ghost);
  border-top: 1px solid var(--border);
  padding-top: 6px;
  margin: 24px 0 10px;
}

.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 26px;
}

.chip {
  background: none;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  font: inherit;
  font-size: 13.5px;
  padding: 4px 14px;
  cursor: pointer;
  transition: all 0.15s ease;
}
.chip:hover { border-color: var(--theme); color: var(--theme); }
html[data-theme="dark"] .chip:hover { border-color: var(--link); color: var(--link); }
.chip.active {
  background: var(--selected-bg);
  border-color: var(--theme);
  color: var(--heading);
  font-weight: 700;
}

/* compact rows (domestic / patents) */
.pub-compact { font-size: 14.5px; padding: 4px 8px; }
.pub-compact .pub-title { font-size: 14.5px; display: inline; }
.pub-compact .pub-venue { display: inline; margin-left: 4px; }

/* ---------- experience / education entries ---------- */

.entry { display: flex; gap: 16px; margin-bottom: 20px; }

.entry-when {
  flex: 0 0 122px;
  color: var(--text-light);
  font-size: 13.5px;
  font-family: "Ubuntu Mono", Menlo, monospace;
  padding-top: 3px;
  white-space: nowrap;
}

.entry-body { flex: 1 1 auto; }
.entry-body .entry-title {
  font-weight: 700;
  color: var(--text-strong);
  font-size: 15.5px;
}
.entry-body .entry-sub { font-size: 14.5px; }
.entry-body ul {
  margin: 6px 0 0;
  padding-left: 1.15em;
  font-size: 14.5px;
}
.entry-body li { margin: 2px 0; }

/* ---------- awards / misc lists ---------- */

.flat-list { list-style: none; padding: 0; margin: 0; }
.flat-list li {
  padding: 4px 0;
  font-size: 15px;
}
.flat-list .year {
  color: var(--text-light);
  font-family: "Ubuntu Mono", Menlo, monospace;
  font-size: 13.5px;
  margin-right: 10px;
}

/* ---------- bio copy button ---------- */

.copy-bio-wrap { margin-top: 10px; }

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

footer.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 30px;
  padding: 18px 0 40px;
  font-size: 13px;
  color: var(--text-light);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  align-items: center;
}
footer.site-footer a { color: var(--text-light); }
footer.site-footer a:hover { color: var(--link-hover); }

/* ---------- mobile sticky top nav (rendered by main.js, hidden on desktop) ---------- */

.mobile-topnav { display: none; }

/* ---------- responsive ---------- */

@media (max-width: 960px) {
  .wrapper { flex-direction: column; gap: 0; }
  .sidebar {
    position: static;
    width: 100%;
    flex: none;
    max-height: none;
    padding: 2.5em 0 1.5em;
    border-bottom: 1px solid var(--border);
  }
  .content { padding-top: 2em; }
  /* keep navigation reachable on small screens: horizontal wrap */
  .side-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 4px 18px;
    padding: 14px 12px 0;
  }
  .side-nav li { margin: 0; }

  /* sticky top nav — follows the viewport while scrolling */
  .mobile-topnav {
    display: flex;
    position: sticky;
    top: 0;
    z-index: 100;
    justify-content: center;
    justify-content: safe center; /* avoid left-edge clipping when links overflow */
    gap: 14px;
    padding: 11px 12px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    font-size: 13.5px;
  }
  .mobile-topnav::-webkit-scrollbar { display: none; }
  .mobile-topnav a {
    color: var(--text);
    text-decoration: none;
    font-weight: 700;
  }
  .mobile-topnav a:hover { color: var(--link-hover); }

  /* keep anchored sections (and pub deep links) clear of the sticky bar */
  .block,
  .pub-list li { scroll-margin-top: 58px; }
}

@media (max-width: 560px) {
  .pub-row { flex-direction: column; align-items: flex-start; gap: 10px; }
  .pub-thumb { flex: none; }
  .pub-thumb img, .pub-thumb svg.teaser { width: 100%; max-width: 300px; height: auto; aspect-ratio: 19/11; }
  .avatar { width: 110px; height: 110px; }
  .entry { flex-direction: column; gap: 2px; }
  .entry-when { flex: none; }
  .news-box li { flex-direction: column; gap: 0; }
  .news-date { flex: none; }
}

/* respect users who prefer no motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}

/* print: browsers strip backgrounds, so force the light palette */
@media print {
  html[data-theme="dark"] {
    --bg: #ffffff;
    --text: #595959;
    --text-strong: #222222;
    --text-light: #6f6f6f;
    --heading: #043361;
    --accent: #fba524;
    --accent-strong: #c47600;
    --link: #006699;
    --link-hover: #004d73;
    --theme: #002d72;
    --selected-bg: #eaf4ff;
    --note-red: #e74d3c;
    --border: #e5e5e5;
    --box-bg: #f8f9fa;
    --box-border: #e9ecef;
    --btn-fg: #000000;
    --btn-border: #000000;
    --code-bg: #f8f8f8;
    --shadow: rgba(0, 0, 0, 0.35);
    --ghost: #e0e0e0;
  }
  .theme-toggle { display: none; }
}