/* ============================================================
   MIDI Lab — midistyle.css
   Typography:
     body      : Source Sans 3   (A)  — the seohong.me feel
     headings  : Lustria         (B)  — from the UT AMRL reference
     lab name  : Lustria         — AMRL's own title is a plain <h1>, so it is Lustria too
                                   (their `header h1 { Playfair Display }` rule is dead CSS —
                                    that layout has no <header> element)
     tabs      : Lato            — as AMRL sets its nav
   Palette is UT Austin: burnt orange #BF5700 on charcoal #333F48.
   ============================================================ */

:root {
  --ut-orange:      #bf5700;
  --ut-orange-dark: #96450b;
  --charcoal:       #333f48;
  --ink:            #23282d;
  --muted:          #5f6b73;
  --faint:          #8a949b;
  --rule:           #e4e4e2;
  --rule-strong:    #cfcfcb;
  --bg:             #ffffff;
  --bg-soft:        #f7f6f4;

  --font-body: 'Source Sans 3', 'Lato', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-head: 'Lustria', Georgia, 'Times New Roman', serif;
  --font-nav: 'Lato', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --wrap: 860px;
  --gutter: 28px;
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  font-weight: 400;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

img { max-width: 100%; height: auto; border: 0; }

a { color: var(--ut-orange); text-decoration: none; }
a:hover { color: var(--ut-orange-dark); text-decoration: underline; }

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 400;
  color: var(--charcoal);
  margin: 0 0 .6em;
  line-height: 1.25;
}

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

/* ------------------------------------------------------------
   Masthead: emblem top-left, lab name on top, tabs underneath
   ------------------------------------------------------------ */
.masthead {
  padding: 24px 0 16px;
}

.masthead-inner {
  display: flex;
  align-items: center;
  gap: 22px;
}

.masthead-logo { flex: 0 0 auto; display: block; }
.masthead-logo img {
  display: block;
  width: 132px;
  height: auto;
}

.masthead-text { min-width: 0; }

.site-title {
  font-family: var(--font-head);
  font-weight: 400;
  /* scales with the viewport so the lab name always stays on one line */
  font-size: clamp(0.86rem, 2.25vw, 1.34rem);
  letter-spacing: -.01em;   /* AMRL tightens its h1 the same way */
  line-height: 1.25;
  white-space: nowrap;
  color: var(--charcoal);
  margin: 0;
}

/* ------------------------------------------------------------
   Tabs
   ------------------------------------------------------------ */
.navbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px;
  width: calc(100% - 2 * var(--gutter));
  max-width: calc(var(--wrap) - 2 * var(--gutter));
  margin: 0 auto;
  padding: 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.navbar a {
  font-family: var(--font-nav);
  font-size: .86rem;
  letter-spacing: normal;
  text-transform: uppercase;
  color: var(--charcoal);
  text-decoration: none;
  padding: 13px 18px;
  border-bottom: 2px solid transparent;
  transition: color .15s ease, border-color .15s ease, background .15s ease;
}

.navbar a:hover {
  color: var(--ut-orange);
  background: var(--bg-soft);
  text-decoration: none;
}

.navbar a.active {
  color: var(--ut-orange);
  border-bottom-color: var(--ut-orange);
}

/* ------------------------------------------------------------
   Page scaffolding
   ------------------------------------------------------------ */
main { flex: 1 0 auto; padding: 34px 0 8px; }

.section { margin-bottom: 44px; }
.section:last-child { margin-bottom: 22px; }

.section-title {
  font-size: 1.32rem;
  margin: 0 0 .2em;
  padding-bottom: .35em;
  border-bottom: 1px solid var(--rule);
}

.section-title .more {
  float: right;
  font-family: var(--font-body);
  font-size: .78rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ut-orange);
  padding-top: .5em;
}

.lede { color: var(--muted); font-size: .95rem; margin: .9em 0 1.2em; }

/* ------------------------------------------------------------
   Home — hero
   ------------------------------------------------------------ */
.hero {
  position: relative;
  aspect-ratio: 16 / 8;
  overflow: hidden;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--rule);
  margin-bottom: 38px;
}

.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1s ease;
}
.hero-slide.is-active { opacity: 1; }
.hero-slide img { width: 100%; height: 100%; object-fit: cover; display: block; }

.hero-dots {
  position: absolute;
  left: 0; right: 0; bottom: 12px;
  display: flex;
  justify-content: center;
  gap: 8px;
}
.hero-dots button {
  width: 8px; height: 8px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: rgba(255,255,255,.55);
  cursor: pointer;
  transition: background .2s ease;
}
.hero-dots button.is-active { background: var(--ut-orange); }

/* ------------------------------------------------------------
   Home — research areas
   ------------------------------------------------------------ */
.area-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 1.1em;
}

.area {
  padding: 14px 16px;
  background: var(--bg-soft);
  border-left: 3px solid var(--rule-strong);
  transition: border-color .15s ease, background .15s ease;
}
.area:hover { border-left-color: var(--ut-orange); background: #f2f0ec; }

.area h3 {
  font-size: .98rem;
  margin: 0 0 .3em;
  color: var(--charcoal);
}
.area p { font-size: .86rem; color: var(--muted); line-height: 1.5; margin: 0; }

/* ------------------------------------------------------------
   PEOPLE
   ------------------------------------------------------------ */
.people-section { margin-bottom: 34px; }

.people-title {
  font-size: 1.15rem;
  color: var(--charcoal);
  margin: 0 0 .9em;
  padding-bottom: .3em;
  border-bottom: 1px solid var(--rule);
}

.people-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px 18px;
}

.person-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 8px 12px;
  border-radius: 6px;
  text-decoration: none;
  color: inherit;
  transition: background .15s ease, box-shadow .15s ease;
}

.person-card:hover {
  text-decoration: none;
  background: var(--bg-soft);
  box-shadow: inset 0 0 0 1px var(--rule);
}

.person-photo {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border-radius: 6px;
  background: var(--charcoal);
  margin-bottom: 9px;
}

.person-photo img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}

/* shown when the photo is missing or fails to load */
.person-photo .initials {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-head);
  font-size: 1.5rem;
  letter-spacing: .05em;
  color: #fff;
}

.person-name {
  font-family: var(--font-head);
  font-size: .93rem;
  line-height: 1.3;
  color: var(--charcoal);
  text-align: center;
  text-decoration: none;          /* no underlines under names */
  transition: color .15s ease;
}
.person-card:hover .person-name { color: var(--ut-orange); }

.person-desc {
  display: block;
  margin-top: .25em;
  font-size: .76rem;
  line-height: 1.35;
  color: var(--muted);
  text-align: center;
}

/* ------------------------------------------------------------
   PUBLICATIONS
   ------------------------------------------------------------ */
.pub-year {
  font-family: var(--font-head);
  font-size: 1.05rem;
  color: var(--ut-orange);
  letter-spacing: .1em;
  margin: 30px 0 6px;
  padding-bottom: .3em;
  border-bottom: 1px solid var(--rule);
}
.pub-year:first-of-type { margin-top: 6px; }

.pub {
  position: relative;
  padding: 12px 14px;
  border-radius: 5px;
  transition: background .15s ease, box-shadow .15s ease;
}

/* the "tab" separation only appears on hover, like the people cards */
.pub:hover {
  background: var(--bg-soft);
  box-shadow: inset 3px 0 0 var(--ut-orange);
}

.pub.has-thumb { padding-right: 168px; }

.pub-title {
  font-family: var(--font-head);
  font-size: 1rem;
  line-height: 1.35;
  color: var(--charcoal);
  text-decoration: none;
  transition: color .15s ease;
}
.pub:hover .pub-title { color: var(--ut-orange); text-decoration: none; }

.pub-authors {
  font-size: .87rem;
  color: var(--muted);
  margin: .25em 0 .2em;
}
.pub-authors .me { color: var(--charcoal); }

.pub-links { font-size: .84rem; margin: 0; }
.pub-links a { color: var(--ut-orange); }
.pub-links .venue { color: var(--charcoal); }

/* "|" instead of "/" between arxiv / project page / code */
.pub-links .sep {
  color: var(--rule-strong);
  margin: 0 .5em;
  user-select: none;
}

/* thumbnail is revealed on hover — only for papers that actually have one,
   and it is absolutely positioned so nothing shifts */
.pub-thumb {
  position: absolute;
  top: 50%;
  right: 14px;
  width: 140px;
  height: 88px;
  transform: translateY(-50%) translateX(8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity .18s ease, transform .18s ease;
  border-radius: 4px;
  overflow: hidden;
  background: var(--bg-soft);
}
.pub-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.pub:hover .pub-thumb { opacity: 1; transform: translateY(-50%) translateX(0); }

/* once the thumbnail is visible it is also clickable — it opens the lightbox */
.pub:hover .pub-thumb,
.pub:has(.pub-thumb button:focus-visible) .pub-thumb { pointer-events: auto; }
/* the button that wraps the thumbnail is created by the script on
   publications.html, and it resets its own box there — inline, so a stale
   copy of this stylesheet can never leave it with the browser's default
   button border drawn around the figure */
.pub-thumb button:focus-visible { outline: 2px solid var(--ut-orange); outline-offset: 2px; }
/* Keyboard users need the thumbnail on screen when its button takes focus.
   This is :focus-visible, not :focus-within — a mouse click also focuses the
   button, and with :focus-within that thumbnail stayed pinned open after the
   lightbox closed, floating over the list until you clicked somewhere else. */
.pub:has(.pub-thumb button:focus-visible) .pub-thumb {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}

/* ------------------------------------------------------------
   LIGHTBOX (full view of a paper figure)
   ------------------------------------------------------------ */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 40px 28px;
  background: rgba(35, 40, 45, .88);
  opacity: 0;
  visibility: hidden;
  transition: opacity .18s ease, visibility .18s ease;
}
.lightbox.is-open { opacity: 1; visibility: visible; }
.lightbox[hidden] { display: none; }

.lightbox-figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  max-width: 100%;
  max-height: 100%;
}
.lightbox-figure img {
  display: block;
  max-width: min(1100px, 100%);
  max-height: 78vh;
  width: auto;
  height: auto;
  object-fit: contain;
  background: var(--bg);
  border-radius: 4px;
  box-shadow: 0 18px 48px rgba(0, 0, 0, .45);
  transform: scale(.98);
  transition: transform .18s ease;
}
.lightbox.is-open .lightbox-figure img { transform: scale(1); }

.lightbox-caption {
  font-family: var(--font-head);
  font-size: .95rem;
  line-height: 1.4;
  color: #fff;
  text-align: center;
  max-width: 720px;
}

.lightbox-close {
  position: absolute;
  top: 14px;
  right: 18px;
  width: 38px;
  height: 38px;
  font: 400 1.6rem/1 var(--font-body);
  color: #fff;
  background: rgba(255, 255, 255, .12);
  border: 0;
  border-radius: 50%;
  cursor: pointer;
  transition: background .15s ease;
}
.lightbox-close:hover { background: rgba(255, 255, 255, .26); }
.lightbox-close:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }

@media (prefers-reduced-motion: reduce) {
  .lightbox, .lightbox-figure img { transition: none; }
}

/* ------------------------------------------------------------
   GETTING INVOLVED
   ------------------------------------------------------------ */
.prose { max-width: 720px; }
.prose h2 {
  font-size: 1.15rem;
  margin-top: 1.6em;
  padding-bottom: .3em;
  border-bottom: 1px solid var(--rule);
}
.prose h2:first-child { margin-top: 0; }
.prose p { font-size: .97rem; }

.callout {
  background: var(--bg-soft);
  border-left: 3px solid var(--ut-orange);
  padding: 14px 18px;
  margin: 1.2em 0;
  font-size: .93rem;
}

/* ------------------------------------------------------------
   Footer
   ------------------------------------------------------------ */
.site-footer {
  flex-shrink: 0;
  margin-top: 40px;
  border-top: 1px solid var(--rule);
  padding: 20px 0 28px;
}
.site-footer p {
  font-family: var(--font-head);
  text-align: center;
  font-size: .78rem;
  color: var(--faint);
  margin: 0;
}

/* ------------------------------------------------------------
   Responsive
   ------------------------------------------------------------ */
@media (max-width: 860px) {
  .people-grid { grid-template-columns: repeat(3, 1fr); }
  .area-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  :root { --gutter: 18px; }
  .masthead-inner { flex-direction: column; align-items: flex-start; gap: 12px; }
  .masthead-logo img { width: 112px; }
  /* one line is a desktop goal — on a phone the name has to wrap */
  .site-title { white-space: normal; font-size: clamp(0.98rem, 4.2vw, 1.15rem); }
  .navbar { justify-content: flex-start; }
  .navbar a { padding: 11px 12px; font-size: .76rem; }
  .people-grid { grid-template-columns: repeat(3, 1fr); }
  .area-grid { grid-template-columns: 1fr; }
  .hero { aspect-ratio: 4 / 3; }
  .section-title .more { float: none; display: block; padding-top: .4em; }

  /* no room for hover thumbnails on touch screens */
  .pub.has-thumb { padding-right: 14px; }
  .pub-thumb { display: none; }
}

@media (max-width: 420px) {
  .people-grid { grid-template-columns: repeat(2, 1fr); }
}