/* ==========================================================
   Jaichung Lee, academic website
   Serif body, navy accent, light and dark themes
   ========================================================== */

:root {
  --bg: #fcfcfb;
  --surface: #f3f5f8;
  --text: #1c2129;
  --muted: #56606d;
  --faint: #8b94a1;
  --rule: #e2e5ea;
  --accent: #1f3a5f;
  --accent-hover: #2d5286;
  --accent-soft: #e9eef5;
  --on-accent: #ffffff;
  --figure-bg: #ffffff;

  --serif: "Source Serif 4", "Source Serif Pro", Georgia, "Times New Roman", serif;
  --sans: "Source Sans 3", "Source Sans Pro", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;

  --measure: 880px;
  --radius: 6px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12161c;
    --surface: #1a2029;
    --text: #e4e7eb;
    --muted: #a4adb9;
    --faint: #6f7987;
    --rule: #2a313c;
    --accent: #9dbde6;
    --accent-hover: #bcd3f0;
    --accent-soft: #1d2a3b;
    --on-accent: #0f1620;
    --figure-bg: #f4f5f7;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #12161c;
  --surface: #1a2029;
  --text: #e4e7eb;
  --muted: #a4adb9;
  --faint: #6f7987;
  --rule: #2a313c;
  --accent: #9dbde6;
  --accent-hover: #bcd3f0;
  --accent-soft: #1d2a3b;
  --on-accent: #0f1620;
  --figure-bg: #f4f5f7;
  color-scheme: dark;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.65;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; text-decoration-color: color-mix(in srgb, var(--accent) 35%, transparent); }
a:hover { color: var(--accent-hover); text-decoration-color: currentColor; }
p { margin: 0 0 1em; }
h1, h2, h3 { line-height: 1.25; margin: 0; font-weight: 600; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }

.container { max-width: var(--measure); margin: 0 auto; padding: 0 24px; }
.container-wide { max-width: 1040px; }
main.container { padding-top: 56px; padding-bottom: 88px; }

.skip-link { position: absolute; left: -999px; top: 8px; background: var(--accent); color: var(--on-accent); padding: 6px 12px; z-index: 10; }
.skip-link:focus { left: 8px; }

/* ---------- Header ---------- */
.site-header { border-bottom: 1px solid var(--rule); }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; flex-wrap: wrap; }
.site-title { font-size: 1.2rem; font-weight: 600; color: var(--text); text-decoration: none; letter-spacing: 0.01em; }
.site-title:hover { color: var(--accent); }
.site-nav { display: flex; align-items: center; gap: 22px; font-family: var(--sans); font-size: 0.8rem; letter-spacing: 0.09em; text-transform: uppercase; font-weight: 600; }
.site-nav a { color: var(--muted); text-decoration: none; padding: 4px 0; border-bottom: 1.5px solid transparent; }
.site-nav a:hover { color: var(--text); }
.site-nav a[aria-current="page"] { color: var(--accent); border-bottom-color: var(--accent); }

.theme-toggle { display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 32px; margin-left: -4px; padding: 0; border: 1px solid var(--rule); border-radius: 50%; background: transparent; color: var(--muted); cursor: pointer; }
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }
.theme-toggle svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}

/* ---------- Buttons ---------- */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 8px 15px; border: 1px solid var(--accent); border-radius: var(--radius); background: transparent; color: var(--accent); font-family: var(--sans); font-size: 0.9rem; font-weight: 600; line-height: 1.2; text-decoration: none; transition: background-color .15s, color .15s, border-color .15s; }
.btn:hover { background: var(--accent-soft); color: var(--accent); }
.btn svg { width: 16px; height: 16px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.btn-primary { background: var(--accent); color: var(--on-accent); }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: var(--on-accent); }
.btn-sm { padding: 5px 11px; font-size: 0.82rem; }
.btn-sm svg { width: 14px; height: 14px; }

/* ---------- Shared type ---------- */
.eyebrow { margin: 0 0 10px; font-family: var(--sans); font-size: 0.8rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); }
.eyebrow-sm { font-size: 0.7rem; margin-bottom: 6px; }
.label { font-family: var(--sans); font-size: 0.78rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin-right: 6px; }
.section { margin-top: 64px; }
.section-title { display: flex; align-items: center; gap: 14px; margin-bottom: 28px; font-family: var(--sans); font-size: 1.25rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.section-title::after { content: ""; flex: 1; height: 1px; background: var(--rule); }
.subhead { margin: 28px 0 8px; font-family: var(--sans); font-size: 0.8rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.abstract { margin: 0; color: var(--text); hyphens: auto; }

/* ---------- Hero ---------- */
.hero { display: grid; grid-template-columns: 210px 1fr; gap: 44px; align-items: start; }
.hero-photo { width: 210px; aspect-ratio: 3 / 4; object-fit: cover; border-radius: var(--radius); background: var(--surface); }
.hero-name { font-size: 2.5rem; font-weight: 600; letter-spacing: -0.01em; }
.hero-subtitle { margin: 6px 0 22px; font-size: 1.15rem; color: var(--muted); }
.hero-bio p { margin-bottom: 0.85em; }
.name-note { font-size: 0.95rem; color: var(--muted); }
.name-note em { color: var(--text); }
.hero-fields { margin: 18px 0 24px; padding-top: 16px; border-top: 1px solid var(--rule); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }

/* ---------- Job market paper ---------- */
.jmp { margin-top: 72px; padding-top: 44px; border-top: 1px solid var(--rule); }
.jmp-title { font-size: 2rem; font-weight: 600; line-height: 1.2; letter-spacing: -0.005em; }
.jmp-authors { margin: 12px 0 18px; font-style: italic; color: var(--muted); }
.jmp-summary { font-size: 1.15rem; line-height: 1.6; margin-bottom: 22px; }
.jmp-figure { margin: 32px 0 0; }
.jmp-figure figcaption { margin-top: 10px; font-size: 0.9rem; color: var(--muted); }

/* ---------- Figures and placeholders ---------- */
.figure-frame, .thumb { display: flex; align-items: center; justify-content: center; overflow: hidden; border: 1px solid var(--rule); border-radius: var(--radius); background: var(--figure-bg); }
.figure-frame img { width: 100%; height: auto; }
.figure-frame.is-empty { aspect-ratio: 3 / 1; }
.thumb { width: 100%; aspect-ratio: 4 / 3; }
.thumb img { width: 100%; height: 100%; object-fit: contain; padding: 6px; }
a.thumb:hover, a.figure-frame:hover { border-color: var(--accent); }
.is-empty { background: var(--surface); color: var(--faint); }
.is-empty svg { width: 34%; max-width: 150px; height: auto; opacity: 0.8; }

/* ---------- Research list ---------- */
.papers { list-style: none; margin: 0; padding: 0; }
.paper { display: grid; grid-template-columns: 220px 1fr; gap: 28px; padding: 28px 0; border-bottom: 1px solid var(--rule); }
.paper:first-child { padding-top: 0; }
.paper:last-child { border-bottom: 0; }
.paper-title { font-size: 1.25rem; font-weight: 600; line-height: 1.3; }
.paper-title a { color: var(--text); text-decoration: none; }
.paper-title a:hover { color: var(--accent); text-decoration: underline; }
.paper-authors { margin: 6px 0 10px; font-style: italic; color: var(--muted); font-size: 0.98rem; }
.paper-summary { font-size: 0.98rem; margin-bottom: 12px; }
.paper-links { display: flex; flex-wrap: wrap; gap: 8px; margin: 4px 0 0; }

.abstract-toggle { margin-top: 14px; }
.abstract-toggle summary { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; list-style: none; font-family: var(--sans); font-size: 0.82rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.abstract-toggle summary::-webkit-details-marker { display: none; }
.abstract-toggle summary::before { content: "\203A"; display: inline-block; width: 10px; font-size: 1.25em; line-height: 1; transition: transform .15s; }
.abstract-toggle[open] summary::before { transform: rotate(90deg); }
.abstract-toggle summary:hover { color: var(--accent); }
.abstract-toggle .abstract { margin-top: 10px; font-size: 0.98rem; padding-left: 14px; border-left: 2px solid var(--rule); }

/* ---------- References ---------- */
.refs { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 28px; }
.ref p { margin: 0; }
.ref-name { font-weight: 600; font-size: 1.05rem; margin-bottom: 2px !important; }
.ref-name a { color: var(--text); text-decoration: none; }
.ref-name a:hover { color: var(--accent); }
.ref-meta { font-size: 0.95rem; color: var(--muted); line-height: 1.5; }

/* ---------- Generic pages ---------- */
.page-title { font-size: 2.2rem; font-weight: 600; margin-bottom: 12px; }
.page-intro { color: var(--muted); margin-bottom: 8px; }
.prose h2 { margin: 52px 0 20px; font-family: var(--sans); font-size: 1.25rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); display: flex; align-items: center; gap: 14px; }
.prose h2::after { content: ""; flex: 1; height: 1px; background: var(--rule); }
.prose h3 { margin: 28px 0 8px; font-size: 1.2rem; }
.prose ul { padding-left: 1.2em; }

.entries { list-style: none; margin: 0; padding: 0; }
.entry { display: flex; justify-content: space-between; gap: 24px; padding: 14px 0; border-bottom: 1px solid var(--rule); }
.entry:last-child { border-bottom: 0; }
.entry p { margin: 0; }
.entry-title { font-weight: 600; }
.entry-meta { color: var(--muted); font-size: 0.95rem; }
.entry-side { flex: none; font-family: var(--sans); font-size: 0.9rem; color: var(--muted); white-space: nowrap; }

/* ---------- CV ---------- */
.cv-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 24px; }
.cv-head .page-title { margin: 0; }
.cv-frame { border: 1px solid var(--rule); border-radius: var(--radius); overflow: hidden; background: var(--surface); }
.cv-frame iframe { display: block; width: 100%; height: calc(100vh - 220px); min-height: 640px; border: 0; }
.cv-fallback { margin-top: 12px; font-size: 0.9rem; color: var(--muted); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--rule); }
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px 24px; padding-top: 22px; padding-bottom: 28px; font-family: var(--sans); font-size: 0.85rem; color: var(--faint); }
.footer-inner a { color: var(--muted); text-decoration: none; }
.footer-inner a:hover { color: var(--accent); }

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  body { font-size: 1rem; }
  .container { padding: 0 16px; }
  main.container { padding-top: 36px; padding-bottom: 64px; }
  .header-inner { padding-top: 10px; padding-bottom: 10px; }
  .site-nav { gap: 16px; }
  .hero { grid-template-columns: 1fr; gap: 24px; }
  .hero-photo { width: 150px; }
  .hero-name { font-size: 2rem; }
  .jmp { margin-top: 52px; padding-top: 36px; }
  .jmp-title { font-size: 1.55rem; }
  .jmp-summary { font-size: 1.05rem; }
  .paper { grid-template-columns: 1fr; gap: 16px; }
  .thumb { max-width: 360px; }
  .page-title { font-size: 1.8rem; }
  .cv-frame iframe { height: 75vh; min-height: 480px; }
  .entry { flex-direction: column; gap: 2px; }
}

/* ---------- Print ---------- */
@media print {
  .site-header, .site-footer, .hero-actions, .theme-toggle, .paper-links { display: none; }
  body { background: #fff; color: #000; }
  .abstract-toggle > .abstract { display: block; }
}

/* ---------- Teaching ---------- */
.teaching-statement { font-size: 1.08rem; line-height: 1.7; }
.entry-course { padding: 22px 0; }
.entry-highlights { margin-top: 6px !important; font-size: 0.98rem; }
.feedback { margin-top: 14px; }
.feedback-label { font-family: var(--sans); font-size: 0.72rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--faint); margin-bottom: 6px !important; }
.feedback blockquote { margin: 0 0 8px; padding: 2px 0 2px 14px; border-left: 2px solid var(--accent-soft); font-style: italic; color: var(--muted); font-size: 0.97rem; }
.feedback blockquote:last-child { margin-bottom: 0; }
.prose h3.entries-school { margin: 28px 0 6px; font-size: 1.15rem; font-weight: 600; color: var(--text); }
.entries-compact .entry { padding: 9px 0; }
.entries-compact .entry-title { font-weight: 400; }
.prose ul.entries { padding-left: 0; }