/* ===== Variables ===== */
:root {
  --color-primary: #ba0c2f;
  --color-primary-dark: #000000;
  --color-accent: #000000;
  --color-bg: #ffffff;
  --color-bg-alt: #f4f6f8;
  --color-text: #232527;
  --color-text-muted: #5b636a;
  --color-border: #e0e4e8;
  --max-width: 1100px;
  --radius: 6px;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-heading: Georgia, "Times New Roman", serif;
}

/* ===== Reset ===== */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--color-primary-dark);
  line-height: 1.25;
  margin-top: 0;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header ===== */
.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: bold;
  color: var(--color-primary-dark);
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  height: 44px;
  width: auto;
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 8px 10px;
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  margin: 4px 0;
}

.main-nav ul {
  list-style: none;
  display: flex;
  gap: 28px;
  margin: 0;
  padding: 0;
}

.main-nav a {
  color: var(--color-text);
  font-size: 0.95rem;
  font-weight: 500;
}

.main-nav a.active,
.main-nav a:hover {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 2px solid var(--color-accent);
}

/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  padding: 72px 24px;
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.hero-text {
  flex: 1;
  min-width: 0;
}

.hero h1 {
  color: #fff;
  font-size: 2.4rem;
  max-width: 720px;
}

.hero p {
  max-width: 640px;
  font-size: 1.1rem;
  color: #dbe4ee;
}

.hero .btn {
  margin-top: 12px;
}

.hero-logo {
  flex-shrink: 0;
  width: 200px;
  height: auto;
}

@media (max-width: 800px) {
  .hero-inner {
    flex-direction: column;
    text-align: center;
  }

  .hero-logo {
    order: -1;
    width: 150px;
  }

  .hero p {
    margin-left: auto;
    margin-right: auto;
  }
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  padding: 10px 22px;
  border-radius: var(--radius);
  font-weight: 600;
  border: none;
  cursor: pointer;
}

.btn:hover {
  background: #2a2a2a;
  text-decoration: none;
}

.btn-outline {
  background: transparent;
  border: 1px solid #fff;
  color: #fff;
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* ===== Sections ===== */
section {
  padding: 56px 0;
}

section.alt {
  background: var(--color-bg-alt);
}

.section-title {
  margin-bottom: 8px;
}

.section-lede {
  color: var(--color-text-muted);
  max-width: 640px;
  margin-bottom: 32px;
}

/* ===== Cards / Grids ===== */
.grid {
  display: grid;
  gap: 24px;
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
}

.card h3 {
  margin-bottom: 8px;
  font-size: 1.15rem;
}

.card p {
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* ===== Resources ===== */
.resource-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.resource-list li {
  border-top: 1px solid var(--color-border);
}

.resource-list li:first-child {
  border-top: none;
}

.resource-list a {
  display: block;
  padding: 9px 0;
  color: var(--color-text);
}

.resource-list a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

/* Research areas overview figure */
.research-areas-heading {
  margin-top: 40px;
  margin-bottom: 16px;
  font-size: 1.3rem;
}

.research-overview-figure {
  margin: 0;
  text-align: center;
}

.research-overview-figure img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: #fff;
}

/* ===== Home — lab impact content ===== */
.impact-list {
  margin: 0 0 20px;
  padding-left: 20px;
}

.impact-list li {
  margin-bottom: 6px;
}

.impact-note {
  color: var(--color-text-muted);
  font-style: italic;
  font-size: 0.95rem;
  margin-bottom: 0;
}

.stat-callout {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-top: 8px;
}

section.alt .stat-callout {
  background: #fff;
}

/* Instrumentation thumbnails (home page, below the carousel) */
.instrument-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 28px;
}

.instrument-thumb {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 16px;
  font: inherit;
  color: inherit;
  text-align: center;
  cursor: zoom-in;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.instrument-thumb:hover,
.instrument-thumb:focus-visible {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
  transform: translateY(-2px);
}

.instrument-thumb img {
  max-width: 100%;
  height: 130px;
  object-fit: contain;
  margin-bottom: 12px;
}

.instrument-thumb-caption {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

@media (max-width: 800px) {
  .instrument-gallery {
    grid-template-columns: 1fr;
  }
}

/* Lightbox for enlarged instrumentation photos */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(20, 20, 22, 0.9);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
  z-index: 1000;
}

.lightbox[hidden] {
  display: none;
}

.lightbox-img {
  max-width: 90vw;
  max-height: 78vh;
  object-fit: contain;
  border-radius: var(--radius);
  background: #fff;
}

.lightbox-caption {
  color: #fff;
  margin: 18px 0 0;
  font-size: 0.95rem;
  max-width: 700px;
  text-align: center;
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 24px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 1.6rem;
  line-height: 1;
  cursor: pointer;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.22);
}

/* ===== People ===== */
.person-card {
  text-align: center;
}

.avatar-placeholder {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.avatar-photo {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--color-border);
  margin: 0 auto 16px;
  flex-shrink: 0;
  display: block;
}

.person-role {
  color: var(--color-accent);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 8px;
}

.person-pi {
  display: flex;
  align-items: flex-start;
  gap: 40px;
  text-align: left;
  width: 100%;
  padding: 40px;
}

.person-pi-media {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.person-pi .avatar-placeholder,
.person-pi .avatar-photo {
  width: 200px;
  height: 200px;
  margin: 0;
  flex-shrink: 0;
  font-size: 0.95rem;
}

.person-pi h3 {
  font-size: 1.6rem;
}

.person-pi p {
  color: var(--color-text-muted);
  max-width: 640px;
}

@media (max-width: 640px) {
  .person-pi {
    flex-direction: column;
    text-align: center;
    padding: 28px;
  }
}

.contact-links {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  gap: 14px;
  margin-top: 12px;
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.contact-links .social-link {
  margin-top: 0;
}

.social-link:hover {
  opacity: 0.7;
}

.social-icon {
  width: 20px;
  height: 20px;
  fill: currentColor;
  flex-shrink: 0;
}

/* ===== Flip Cards ===== */
.flip-card {
  perspective: 1200px;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  min-height: 360px;
  transition: transform 0.6s;
  transform-style: preserve-3d;
  cursor: pointer;
}

.flip-card.flipped .flip-card-inner {
  transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.flip-card-front {
  justify-content: center;
}

.flip-card-back {
  transform: rotateY(180deg);
  overflow-y: auto;
  justify-content: flex-start;
}

.flip-card-back p {
  color: var(--color-text-muted);
  font-size: 0.88rem;
  text-align: left;
}

.flip-hint {
  margin-top: 14px;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  font-style: italic;
}

.flip-back-hint {
  margin-top: auto;
  padding-top: 10px;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  font-style: italic;
}

.flip-card:focus-visible .flip-card-inner {
  outline: 2px solid var(--color-primary);
  outline-offset: 4px;
}

/* ===== Gallery / Carousel ===== */
.carousel {
  max-width: 800px;
  margin: 0 auto;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--color-bg-alt);
}

.carousel-viewport {
  position: relative;
  overflow: hidden;
}

.carousel-track {
  display: flex;
  transition: transform 0.4s ease;
}

.carousel-slide {
  flex: 0 0 100%;
}

.carousel-slide img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  display: block;
}

.gallery-placeholder {
  width: 100%;
  aspect-ratio: 16 / 10;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.carousel-caption {
  padding: 16px 20px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  border-top: 1px solid var(--color-border);
  background: #fff;
}

.carousel-btn {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 52px;
  border: none;
  background: rgba(0, 0, 0, 0.35);
  color: #fff;
  font-size: 1.6rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease;
}

.carousel-btn:hover {
  background: rgba(0, 0, 0, 0.55);
}

.carousel-prev {
  left: 0;
}

.carousel-next {
  right: 0;
}

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  padding: 16px 20px 20px;
  background: #fff;
}

.carousel-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: 1px solid var(--color-primary);
  background: transparent;
  padding: 0;
  cursor: pointer;
}

.carousel-dot.active {
  background: var(--color-primary);
}

@media (max-width: 640px) {
  .carousel-btn {
    width: 40px;
    font-size: 1.3rem;
  }
}

/* Lab-impact cards (home page, below the intro) */
.impact-grid {
  margin-top: 8px;
}

.impact-card h3 {
  margin: -24px -24px 20px;
  padding: 14px 24px;
  background: var(--color-primary);
  color: #fff;
  text-align: center;
  border-radius: var(--radius) var(--radius) 0 0;
  font-size: 1.15rem;
}

.impact-card--wide {
  grid-column: 1 / -1;
}

.impact-card .stat-callout {
  margin-top: 20px;
}

/* ===== Publications ===== */
.pub-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.pub-item {
  border-bottom: 1px solid var(--color-border);
  padding: 20px 0;
}

.pub-item:first-child {
  padding-top: 0;
}

.pub-item .pub-year {
  display: inline-block;
  background: var(--color-bg-alt);
  color: var(--color-text-muted);
  font-size: 0.8rem;
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 8px;
}

.pub-item h3 {
  font-size: 1.05rem;
  margin-bottom: 4px;
}

.pub-item .pub-authors,
.pub-item .pub-venue {
  color: var(--color-text-muted);
  font-size: 0.92rem;
  margin: 0;
}

.filter-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.filter-btn {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 0.85rem;
  cursor: pointer;
}

.filter-btn.active,
.filter-btn:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

.filter-count {
  opacity: 0.7;
  font-variant-numeric: tabular-nums;
}

/* Category tags — aligned with the lab's 10 core research areas, plus a legacy
   "Foundational Physics & Instrumentation" bucket for pre-2013 papers */
:root {
  --cat-imaging: #1f8fb0;
  --cat-protein: #178a82;
  --cat-epigenetics: #8a8f1f;
  --cat-metabolomics: #4a8f3c;
  --cat-lipidomics: #8c2f3d;
  --cat-drug: #ba0c2f;
  --cat-trace: #2f8f52;
  --cat-environmental: #a98f2b;
  --cat-contaminants: #2f8f7a;
  --cat-outreach: #3b6e8f;
  --cat-physics: #6b6f76;
}

.pub-item h3 {
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.pub-item h3 a {
  color: var(--color-primary-dark);
}

.pub-item h3 a:hover {
  color: var(--color-primary);
}

.pub-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--tag-color) 12%, #fff);
  color: var(--tag-color);
}

.tag-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--tag-color);
  flex-shrink: 0;
}

.tag-imaging { --tag-color: var(--cat-imaging); }
.tag-protein { --tag-color: var(--cat-protein); }
.tag-epigenetics { --tag-color: var(--cat-epigenetics); }
.tag-metabolomics { --tag-color: var(--cat-metabolomics); }
.tag-lipidomics { --tag-color: var(--cat-lipidomics); }
.tag-drug { --tag-color: var(--cat-drug); }
.tag-trace { --tag-color: var(--cat-trace); }
.tag-environmental { --tag-color: var(--cat-environmental); }
.tag-contaminants { --tag-color: var(--cat-contaminants); }
.tag-outreach { --tag-color: var(--cat-outreach); }
.tag-physics { --tag-color: var(--cat-physics); }

.badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
}

.badge-oa {
  background: #e5f2ed;
  color: #1f6b4f;
}

.badge-preprint {
  background: var(--color-bg-alt);
  color: var(--color-text-muted);
}

.badge-active {
  background: #e5f2ed;
  color: #1f6b4f;
}

/* Research grants */
.grant-card h3 {
  font-size: 1rem;
}

.grant-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.grant-number {
  font-variant-numeric: tabular-nums;
}

.empty-state {
  display: none;
  padding: 40px 24px;
  text-align: center;
  color: var(--color-text-muted);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.empty-state.show {
  display: block;
}

/* ===== News ===== */
.news-item {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--color-border);
}

.news-date {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  font-weight: 600;
}

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
}

.contact-form label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 0.9rem;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 18px;
  font-family: inherit;
  font-size: 0.95rem;
}

.contact-form textarea {
  min-height: 140px;
  resize: vertical;
}

.contact-info p {
  margin: 0 0 12px;
}

.map-placeholder {
  margin-top: 20px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-primary-dark);
  color: #cbd6e2;
  padding: 40px 24px 24px;
  margin-top: 40px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

.site-footer a {
  color: #cbd6e2;
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 24px auto 0;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.85rem;
  color: #93a3b5;
}

/* ===== Responsive ===== */
@media (max-width: 800px) {
  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .nav-toggle {
    display: block;
  }

  .main-nav {
    display: none;
    width: 100%;
  }

  .main-nav.open {
    display: block;
  }

  .nav-wrap {
    flex-wrap: wrap;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 0;
    padding-top: 12px;
  }

  .main-nav a {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid var(--color-border);
  }

  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .news-item {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .hero h1 {
    font-size: 1.8rem;
  }
}