/* LIQUID Group — site stylesheet
   Light/dark follows the device (prefers-color-scheme); the toggle in the nav overrides it.
   All colors come from the tokens below — edit tokens, not components. */

:root {
  --bg: #f4f4f4;
  --surface: #ffffff;
  --ink: #2d2d2d;
  --muted: #6C757D;
  --line: #e0e0e0;
  --accent: #C81030;        /* CMU Tartan Red */
  --accent-soft: #fce4e6;   /* Light red */
  --navy: #8B0000;          /* Dark red for Architect theme */
  --navy-ink: #ffffff;
  --band: #f4f4f4;          /* Light gray */
  --band-ink: #2d2d2d;
  --shadow: 0 1px 3px rgba(20, 24, 35, 0.12);
}
:root:not([data-theme="light"]) { }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #13161d;
    --surface: #1b202b;
    --ink: #e7e9ef;
    --muted: #adb5bd;
    --line: #2b3140;
    --accent: #ff4757;        /* Brighter red for dark mode */
    --accent-soft: #33221f;
    --band: #232a3b;
    --band-ink: #dfe3ec;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  }
}
:root[data-theme="dark"] {
  --bg: #13161d;
  --surface: #1b202b;
  --ink: #e7e9ef;
  --muted: #adb5bd;
  --line: #2b3140;
  --accent: #ff4757;        /* Brighter red for dark mode */
  --accent-soft: #33221f;
  --band: #232a3b;
  --band-ink: #dfe3ec;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Source Sans 3", "Segoe UI", system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  text-align: left;
}
img { max-width: 100%; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

h1, h2, h3 { font-family: Georgia, "Times New Roman", serif; line-height: 1.2; text-wrap: balance; text-align: left; font-weight: 600; }
h2 { font-size: 1.75rem; margin: 2.4rem 0 0.9rem; color: #C81030; border-left: 4px solid #C81030; padding-left: 12px; text-align: left; }
h3 { font-size: 1.2rem; margin: 1.4rem 0 0.5rem; color: #8B0000; }

.wrap { max-width: 1100px; margin: 0 auto; padding-inline: 20px; }
.prose { max-width: 46rem; }

/* ---------- navigation ---------- */
.nav {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 50;
  background: var(--navy); color: var(--navy-ink);
  border-bottom: 3px solid var(--accent);
}
.nav-inner { max-width: 1280px; margin: 0 auto; padding: 0 16px; display: flex; align-items: center; gap: 12px; min-height: 58px; }
.brand { font-family: "Playfair Display", Georgia, serif; font-weight: 700; font-size: 0.98rem; letter-spacing: 0.03em; color: var(--navy-ink); white-space: nowrap; }
@media (max-width: 480px) { .brand { font-size: 0.82rem; } }
.brand:hover { text-decoration: none; }
.brand .dot { color: var(--accent); }
.nav-links { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.nav-links a {
  color: var(--navy-ink); font-size: 0.8rem; letter-spacing: 0.04em; text-transform: uppercase;
  padding: 8px 8px; border-radius: 4px; white-space: nowrap;
}
.nav-links a:hover { background: rgba(255,255,255,0.1); text-decoration: none; }
.nav-links a[aria-current="page"] { background: rgba(255,255,255,0.14); box-shadow: inset 0 -2px 0 var(--accent); }
.nav-btn {
  background: none; border: 1px solid rgba(255,255,255,0.35); color: var(--navy-ink);
  border-radius: 4px; padding: 6px 10px; cursor: pointer; font-size: 0.85rem;
}
#menuBtn { display: none; margin-left: auto; }
@media (max-width: 900px) {
  #menuBtn { display: inline-block; }
  .nav-links {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    background: var(--navy); flex-direction: column; padding: 8px 16px 14px; gap: 2px;
    border-bottom: 3px solid var(--accent);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 10px 8px; }
}

/* ---------- heroes ---------- */
.hero {
  background: linear-gradient(135deg, #8B0000 0%, #6B0000 100%);
  color: var(--navy-ink);
  text-align: center !important;
  padding: 72px 20px 64px;
  border-bottom: 3px solid #C81030;
}
.hero-home { padding: 96px 20px 84px; }
.hero h1 {
  font-size: clamp(2.6rem, 7vw, 4.6rem); margin: 0; letter-spacing: 0.22em;
  font-weight: 700; text-indent: 0.22em; text-align: center;
}
.hero .rule { width: 180px; height: 2px; background: var(--accent); margin: 22px auto; border: 0; }
.hero .tagline {
  font-family: "Source Sans 3", "Segoe UI", system-ui, sans-serif; font-style: normal;
  font-size: clamp(0.95rem, 2.5vw, 1.3rem); margin: 0 auto; max-width: 100ch; font-weight: 400;
}
@media (min-width: 1024px) {
  .hero .tagline { white-space: nowrap; }
}
.hero .tagline b { color: #FFFFFF; font-weight: 600; }
.hero .page-title { font-size: clamp(2rem, 5vw, 3rem); letter-spacing: 0.06em; text-indent: 0; }
.hero .sub { color: rgba(242, 243, 246, 0.8); margin: 14px auto 0; max-width: 60ch; }

/* ---------- home sections ---------- */
.band { background: var(--band); color: var(--band-ink); padding: 44px 20px; }
.band .wrap p { font-size: 1.2rem; line-height: 1.75; max-width: 52rem; margin: 0 auto; text-align: center !important; }

.home-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 36px; padding-block: 44px; }
@media (max-width: 820px) { .home-grid { grid-template-columns: 1fr; } }

.snapshot {
  border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: var(--surface); box-shadow: var(--shadow); display: flex; flex-direction: column; height: 550px;
}
.snapshot .ph { aspect-ratio: 16/10; }
.snapshot figcaption { padding: 12px 16px; color: var(--muted); font-size: 0.92rem; border-top: 1px solid var(--line); }
.snapshot .gal-link { padding: 0 16px 14px; font-size: 0.85rem; letter-spacing: 0.06em; text-transform: uppercase; }

.news-list { list-style: none; margin: 0; padding: 0; }
.news-list li { padding: 12px 0 12px 18px; border-bottom: 1px solid var(--line); position: relative; }
.news-list li::before { content: ""; position: absolute; left: 0; top: 21px; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.news-list .when { color: var(--muted); font-size: 0.85rem; margin-left: 6px; white-space: nowrap; }

.spotlight {
  margin-top: 20px; padding: 14px 16px; border-left: 3px solid var(--accent);
  background: var(--accent-soft); border-radius: 0 6px 6px 0; font-size: 0.95rem;
}
.spotlight .label { display: block; text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.72rem; color: var(--muted); margin-bottom: 4px; }

.funding { background: color-mix(in srgb, var(--surface) 60%, var(--bg) 40%); border-top: 1px solid var(--line); padding-block: 44px; }
.funding h2 { margin-top: 0; }
.logo-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; justify-content: flex-start; }
.logo-row a { display: inline-flex; align-items: center; gap: 10px; border: 0; background: transparent; border-radius: 0; padding: 0; color: var(--ink); font-weight: 400; font-size: 0.9rem; }
.logo-row img { height: 72px; width: auto; max-width: none; flex: none; object-fit: contain; display: block; }  /* never stretch: keep each logo's own proportions */
.logo-row a:hover { text-decoration: none; opacity: 0.8; }

.funding-separator { width: 60px; height: 2px; background: var(--accent); margin: 24px 0; }

.cmu-info { margin-top: 28px; padding-top: 24px; }
.cmu-info p { color: var(--ink); font-size: 1rem; }
.cmu-info address { color: var(--muted); font-style: normal; line-height: 1.7; font-size: 0.9rem; }

.address { color: var(--muted); font-style: normal; line-height: 1.7; }

.snapshot-image { width: 100%; height: 380px; object-fit: cover; border-radius: 8px; display: block; flex-shrink: 0; }

/* ---------- generic content pages ---------- */
.page { padding-block: 40px 64px; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.12em; font-size: 0.78rem; color: var(--accent); font-weight: 700; margin: 2.6rem 0 0.2rem; }
.eyebrow:first-child { margin-top: 0; }

.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 18px; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: 8px;
  padding: 20px; box-shadow: var(--shadow); display: flex; flex-direction: column; height: 100%;
}
.card h3 { margin-top: 0; margin-bottom: 10px; line-height: 1.3; }
.card p { margin: 0; flex-grow: 1; font-size: 0.95rem; line-height: 1.5; color: var(--ink); }
.card img { width: 100%; height: auto; border-radius: 4px; display: block; margin-bottom: 12px; object-fit: cover; }

/* research */
.thrust { display: grid; grid-template-columns: 1fr 260px; gap: 24px; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 24px; margin-bottom: 18px; box-shadow: var(--shadow); }
@media (max-width: 760px) { .thrust { grid-template-columns: 1fr; } }
.thrust h3 { margin-top: 0; }
.thrust .fig { border: 1px dashed var(--line); border-radius: 6px; display: flex; align-items: center; justify-content: center; color: var(--muted); font-size: 0.85rem; text-align: center; padding: 12px; min-height: 160px; background: var(--bg); }
.thrust .fig img { border-radius: 4px; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.tags span { font-size: 0.76rem; letter-spacing: 0.03em; background: var(--accent-soft); color: var(--accent); border-radius: 999px; padding: 3px 10px; font-weight: 600; }
.pi-tabs { display: flex; gap: 8px; margin: 8px 0 26px; flex-wrap: wrap; }
.pi-tabs button {
  font: inherit; font-weight: 600; padding: 9px 18px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--line); background: var(--surface); color: var(--ink);
}
.pi-tabs button[aria-selected="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }

/* publications */
.pub { display: block; padding: 16px 0; border-bottom: 1px solid var(--line); }
.pub .title { font-weight: 700; }
.pub .authors { color: var(--muted); font-size: 0.93rem; }
.pub .venue { font-size: 0.93rem; font-style: italic; }
.pub-link { color: var(--accent); text-decoration: none; }
.pub-link:hover { text-decoration: underline; }
.year-head { font-family: "Playfair Display", Georgia, serif; font-size: 1.5rem; margin: 2.2rem 0 0.2rem; padding-bottom: 4px; border-bottom: 2px solid var(--accent); display: inline-block; }
.pub-note { color: var(--muted); font-size: 0.9rem; }

/* team */
.member-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(215px, 1fr)); gap: 18px; }
.member { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 20px; text-align: center; box-shadow: var(--shadow); }
.member .avatar {
  width: 96px; height: 96px; border-radius: 50%; margin: 0 auto 12px; overflow: hidden;
  display: flex; align-items: center; justify-content: center;
  background: var(--band); color: var(--band-ink);
  font-family: "Playfair Display", Georgia, serif; font-size: 1.7rem; font-weight: 700;
}
.member .avatar img { width: 100%; height: 100%; object-fit: cover; }
.member .nm { font-weight: 700; }
.member .nm a { color: inherit; }           /* quiet link on names that have a website */
.member .role, .member .meta { color: var(--muted); font-size: 0.9rem; }
.member .meta a { color: var(--accent); }
.member .stmt { font-size: 0.88rem; text-align: left; margin-top: 10px; padding-top: 10px; border-top: 1px solid var(--line); }
.recruit { background: var(--accent-soft); border: 1px solid var(--line); border-radius: 8px; padding: 20px 24px; margin-bottom: 30px; }
.recruit h3 { margin-top: 0; }

.alum-table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.alum-table th { text-align: left; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); padding: 8px 10px; border-bottom: 2px solid var(--accent); }
.alum-table td { padding: 9px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.alum-table .thesis { color: var(--muted); font-size: 0.88rem; }
.table-scroll { overflow-x: auto; }

/* outreach & news timeline */
.timeline { list-style: none; margin: 0; padding: 0 0 0 18px; border-left: 2px solid var(--line); }
.timeline > li { position: relative; padding: 0 0 22px 18px; }
.timeline > li::before { content: ""; position: absolute; left: -6px; top: 8px; width: 10px; height: 10px; border-radius: 50%; background: var(--accent); }
.timeline .yr { font-family: "Playfair Display", Georgia, serif; font-size: 1.35rem; font-weight: 700; }
.timeline ul { margin: 8px 0 0; padding-left: 18px; }
.timeline ul li { margin-bottom: 6px; }
.timeline .d { color: var(--muted); font-size: 0.85rem; margin-right: 6px; font-variant-numeric: tabular-nums; }

/* gallery */
.gal-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.gal-item { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; overflow: hidden; box-shadow: var(--shadow); display: flex; flex-direction: column; height: 100%; }
.gal-item .ph { aspect-ratio: 16/10; }
.gal-item figcaption { padding: 12px 14px; font-size: 0.88rem; color: var(--muted); flex-grow: 1; }
.gal-item figcaption .y { color: var(--accent); font-weight: 700; margin-right: 6px; }

/* outreach gallery within timeline */
.outreach-gallery-wrapper { position: relative; margin-top: 12px; }
.outreach-gallery { display: flex; gap: 12px; overflow: hidden; padding: 0; margin: 0; scroll-behavior: smooth; }
.outreach-gallery-scroll { overflow-x: hidden; position: relative; }
.outreach-item { margin: 0; background: var(--surface); border: 1px solid var(--line); border-radius: 6px; overflow: hidden; flex: 0 0 calc(20% - 10px); min-width: 180px; }
.outreach-item img { width: 100%; aspect-ratio: 4/3; object-fit: cover; display: block; }
.outreach-item figcaption { padding: 8px 10px; font-size: 0.8rem; color: var(--muted); line-height: 1.3; }
.outreach-nav { position: absolute; top: 50%; transform: translateY(-50%); background: rgba(0,0,0,0.6); border: none; color: white; width: 36px; height: 36px; border-radius: 4px; cursor: pointer; font-size: 18px; display: flex; align-items: center; justify-content: center; z-index: 10; }
.outreach-nav:hover { background: rgba(0,0,0,0.8); }
.outreach-nav-prev { left: -48px; }
.outreach-nav-next { right: -48px; }
.outreach-nav:disabled { opacity: 0.5; cursor: not-allowed; }

.ph { /* placeholder used until a real photo is dropped in images/ */
  background:
    radial-gradient(closest-side at 65% 30%, rgba(176, 88, 70, 0.35), transparent),
    radial-gradient(closest-side at 25% 80%, rgba(90, 110, 160, 0.4), transparent),
    var(--band);
  display: flex; align-items: center; justify-content: center;
  color: var(--band-ink); font-size: 0.8rem; letter-spacing: 0.08em; text-transform: uppercase;
}
.ph img { width: 100%; height: 100%; object-fit: cover; }

.btn {
  display: inline-block; font: inherit; font-weight: 600; cursor: pointer;
  border: 1px solid var(--accent); color: var(--accent); background: none;
  border-radius: 6px; padding: 8px 18px; margin-top: 18px;
}
.btn:hover { background: var(--accent); color: #fff; text-decoration: none; }

/* facilities — photo rows, layout follows the original site */
.fac-item {
  display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 28px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 8px;
  padding: 22px; margin: 14px 0 20px; box-shadow: var(--shadow);
}
.fac-item-text { grid-template-columns: 1fr; }
.fac-photos { display: grid; grid-template-columns: 2fr 1fr; grid-template-rows: 1fr 1fr; gap: 8px; aspect-ratio: 3 / 2; }
.fac-photo { position: relative; padding: 0; border: 0; background: var(--bg); border-radius: 6px; overflow: hidden; cursor: zoom-in; }
.fac-photo-main { grid-row: 1 / 3; }
.fac-photos .fac-photo:only-child { grid-column: 1 / 3; }
.fac-photos .fac-photo:nth-child(2):last-child { grid-row: 1 / 3; }
.fac-photo img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform 0.25s; }
.fac-photo:hover img { transform: scale(1.04); }
.fac-photo:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.fac-more { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; background: rgba(0, 0, 0, 0.5); color: #fff; font-weight: 700; font-size: 0.95rem; }
.fac-label { text-transform: uppercase; letter-spacing: 0.1em; font-size: 0.72rem; font-weight: 700; color: var(--accent); margin-bottom: 4px; }
.fac-body h3 { margin: 0 0 10px; line-height: 1.3; }
.fac-body p, .fac-syn p { margin: 0 0 12px; line-height: 1.6; color: var(--ink); }
.fac-specs { margin: 4px 0 0; border-top: 1px solid var(--line); }
.fac-specs > div { display: grid; grid-template-columns: 9.5em 1fr; gap: 12px; padding: 7px 0; border-bottom: 1px solid var(--line); font-size: 0.92rem; }
.fac-specs dt { color: var(--muted); font-weight: 600; }
.fac-specs dd { margin: 0; color: var(--ink); }
.fac-groups { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 8px 28px; }
.fac-group-label { font-weight: 700; font-size: 0.85rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 4px; }
.fac-groups ul { margin: 0; padding-left: 1.2em; line-height: 1.7; }
.fac-note { color: var(--muted); font-style: italic; font-size: 0.92rem; margin-top: 12px !important; }
.fac-intro { max-width: 780px; line-height: 1.7; color: var(--muted); margin: 0.4rem 0 1.2rem; }
.fac-syn-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 18px; }
.fac-syn img { aspect-ratio: 16 / 9; margin: -20px -20px 16px; width: calc(100% + 40px); max-width: none; border-radius: 8px 8px 0 0; }
.fac-syn h3 { margin-bottom: 2px; }
.fac-facility { font-size: 0.78rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; }
.fac-link { display: inline-block; margin-top: 12px; font-size: 0.9rem; font-weight: 600; }
@media (max-width: 760px) {
  .fac-item { grid-template-columns: 1fr; gap: 18px; padding: 16px; }
  .fac-specs > div { grid-template-columns: 8em 1fr; }
}
.coming { color: var(--muted); font-style: italic; }

/* image modal lightbox */
.modal {
  display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0, 0, 0, 0.8); z-index: 1000;
  align-items: center; justify-content: center;
  animation: fadeIn 0.2s ease-in-out;
}
.modal.show { display: flex; }
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
.modal-content {
  position: relative; background: var(--surface); border-radius: 12px;
  max-width: 90vw; max-height: 90vh; display: flex; flex-direction: column;
  overflow: hidden; box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}
.modal-close {
  position: absolute; top: 12px; right: 12px; background: rgba(0, 0, 0, 0.5);
  color: white; border: none; font-size: 32px; cursor: pointer; padding: 0;
  width: 40px; height: 40px; border-radius: 50%; display: flex;
  align-items: center; justify-content: center; z-index: 10;
  transition: background 0.2s;
}
.modal-close:hover { background: rgba(0, 0, 0, 0.7); }
.modal-image-container {
  flex: 1; display: flex; align-items: center; justify-content: center;
  overflow: hidden; background: #f0f0f0;
}
.modal-image-container img {
  max-width: 100%; max-height: calc(90vh - 70px); object-fit: contain;
}
.modal-nav {
  display: flex; align-items: center; justify-content: center; gap: 24px;
  padding: 16px 20px; background: var(--band); border-top: 1px solid var(--line);
}
.modal-btn {
  background: rgba(0, 0, 0, 0.4); color: white; border: none;
  font-size: 1.5rem; width: 36px; height: 36px; border-radius: 4px;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: background 0.2s;
}
.modal-btn:hover:not(:disabled) { background: rgba(0, 0, 0, 0.6); }
.modal-btn:disabled {
  opacity: 0.4; cursor: not-allowed;
}
.modal-counter {
  font-size: 0.9rem; color: var(--muted); min-width: 60px; text-align: center;
}

/* footer */
footer { background: var(--navy); color: rgba(242, 243, 246, 0.75); margin-top: 56px; padding: 26px 20px calc(26px + env(safe-area-inset-bottom, 0px)); font-size: 0.9rem; text-align: center; }
footer a { color: rgba(242, 243, 246, 0.95); }
footer div:last-child a { color: var(--navy); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}