/* ===== FONTS ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ===== RESET & BASE ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', 'Avenir Next', sans-serif;
  color: #1a1a1a;
  background-color: #fff;
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: #1a1a1a;
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: #555;
}

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

/* ===== HEADER & NAVIGATION ===== */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: #fff;
  border-bottom: 1px solid #e0e0e0;
}

.nav-top {
  padding: 1.5rem 3rem 0.5rem;
  text-align: center;
}

.nav-top .lab-name {
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: #1a1a1a;
}

.nav-top .lab-name a {
  color: inherit;
}

.nav-top .lab-tagline {
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #1a1a1a;
  margin-top: 0.1rem;
}

.nav-top .lab-subtitle {
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: #888;
  margin-top: 0.2rem;
}

nav {
  width: 100%;
  border-top: 1px solid #e8e8e8;
}

nav ul {
  display: flex;
  justify-content: center;
  align-items: center;
  list-style: none;
  padding: 0;
  margin: 0;
  width: 100%;
}

nav ul li {
  flex: 1;
  text-align: center;
}

nav ul li a {
  display: block;
  padding: 0.85rem 0.5rem;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #1a1a1a;
  transition: all 0.3s ease;
  position: relative;
}

nav ul li a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 1px;
  background: #1a1a1a;
  transition: width 0.3s ease;
}

nav ul li a:hover::after,
nav ul li a.active::after {
  width: 60%;
}

nav ul li a:hover {
  color: #555;
}

nav ul li a.active {
  color: #000;
  font-weight: 600;
}

/* Hamburger */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  position: absolute;
  right: 1.5rem;
  top: 1.2rem;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: #1a1a1a;
  margin: 5px 0;
  transition: all 0.3s ease;
}

.menu-toggle.open span:nth-child(1) {
  transform: rotate(45deg) translate(4px, 5px);
}

.menu-toggle.open span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.open span:nth-child(3) {
  transform: rotate(-45deg) translate(4px, -5px);
}

/* ===== MAIN CONTENT ===== */
main {
  margin-top: 140px;
  min-height: calc(100vh - 140px - 80px);
}

.page-section {
  max-width: 960px;
  margin: 0 auto;
  padding: 3rem 2rem 4rem;
}

/* ===== HOME PAGE ===== */
.hero {
  width: 100%;
  padding: 4rem 3rem;
  background: #fafafa;
  text-align: center;
  border-bottom: 1px solid #e8e8e8;
}

.hero h1 {
  font-size: 2.4rem;
  font-weight: 300;
  letter-spacing: 0.08em;
  color: #1a1a1a;
  margin-bottom: 0.5rem;
}

.hero .tagline {
  font-size: 1rem;
  font-weight: 400;
  color: #777;
  letter-spacing: 0.05em;
}

.home-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 3rem 2rem 4rem;
}

.home-content h2 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: 1rem;
  margin-bottom: 1.5rem;
  color: #1a1a1a;
}

.home-content p {
  font-size: 0.95rem;
  line-height: 1.85;
  color: #444;
  margin-bottom: 1.2rem;
}

.home-photo {
  margin-top: 1.5rem;
  width: 100%;
}

.home-photo img {
  width: 100%;
  height: auto;
  display: block;
}

/* ===== RESEARCH ===== */
.research-title {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #1a1a1a;
  padding: 1.5rem 0;
  border-bottom: 2px solid #ccc;
}

.research-title:first-child {
  padding-top: 1rem;
}

.research-title:last-child {
  border-bottom: none;
}

.research-description {
  font-size: 0.95rem;
  line-height: 1.85;
  color: #444;
  padding-bottom: 1.5rem;
  border-bottom: 2px solid #ccc;
}

.research-video {
  padding: 1rem 0 0.5rem;
}

.research-video video {
  width: 100%;
  height: auto;
  display: block;
}

.research-video--compact {
  background: #000;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0.8rem 0;
}

.research-video.research-video--compact video {
  width: 50%;
}

.research-video--white {
  background: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0.8rem 0;
}

.research-video--white video {
  clip-path: inset(0 2px 0 0);
}

.research-video.research-video--white video {
  width: 40%;
}

.research-video.research-video--large video {
  width: 70%;
}

/* ===== PUBLICATIONS ===== */
.publications-list {
  list-style: none;
  padding: 0;
}

.publications-list li {
  padding: 1.5rem 0;
  border-bottom: 1px solid #eee;
}

.publications-list li:last-child {
  border-bottom: none;
}

.pub-year {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: #999;
  margin-bottom: 0.4rem;
}

.pub-title {
  font-size: 1rem;
  font-weight: 500;
  color: #1a1a1a;
  margin-bottom: 0.3rem;
  line-height: 1.5;
}

.pub-title a {
  color: #1a1a1a;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}

.pub-title a:hover {
  border-bottom-color: #999;
}

.pub-authors {
  font-size: 0.85rem;
  color: #666;
  margin-bottom: 0.2rem;
}

.pub-authors strong {
  color: #1a1a1a;
}

.pub-journal {
  font-size: 0.85rem;
  font-style: italic;
  color: #888;
}

/* ===== TEAM ===== */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 2.5rem;
  margin-top: 1rem;
}

.team-card {
  text-align: center;
}

.team-card .photo {
  width: 160px;
  height: auto;
  margin: 0 auto 1rem;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.team-card .photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.team-card .photo .placeholder {
  font-size: 2.5rem;
  color: #bbb;
}

.team-card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 0.2rem;
}

.team-card .role {
  font-size: 0.8rem;
  color: #888;
  letter-spacing: 0.05em;
}

/* ===== CONTACT ===== */
.contact-content {
  max-width: 600px;
  margin: 0 auto;
}

.contact-content .contact-item {
  padding: 1rem 0;
  border-bottom: 1px solid #eee;
  display: flex;
  gap: 1rem;
}

.contact-content .contact-item:last-child {
  border-bottom: none;
}

.contact-label {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #999;
  min-width: 100px;
}

.contact-value {
  font-size: 0.95rem;
  color: #444;
  line-height: 1.6;
}

.contact-value a {
  color: #444;
  border-bottom: 1px solid #ccc;
}

.contact-value a:hover {
  color: #000;
  border-bottom-color: #000;
}

/* ===== GALLERY (Lab Life) ===== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem 1.5rem;
}

.gallery-grid .gallery-item {
  background: #fff;
  color: #bbb;
  font-size: 0.85rem;
  overflow: visible;
}

.gallery-grid .gallery-item img {
  aspect-ratio: 4/3;
  object-fit: cover;
}

.gallery-grid .gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.gallery-grid .gallery-item:hover img {
  transform: scale(1.03);
}

.gallery-caption {
  font-size: 0.8rem;
  color: #888;
  text-align: center;
  padding: 0.5rem 0;
  letter-spacing: 0.05em;
}

/* ===== MEDIA ===== */
.media-list {
  list-style: none;
  padding: 0;
}

.media-list li {
  padding: 1.5rem 0;
  border-bottom: 1px solid #eee;
}

.media-list li:last-child {
  border-bottom: none;
}

.media-list a {
  font-size: 1rem;
  font-weight: 500;
  color: #1a1a1a;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}

.media-list a:hover {
  border-bottom-color: #999;
}

.media-list .media-source {
  display: block;
  font-size: 0.8rem;
  color: #999;
  margin-top: 0.3rem;
}

.media-entry {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.media-logo {
  flex-shrink: 0;
}

.media-logo--dual {
  display: flex;
  gap: 0.5rem;
}

.media-info {
  flex: 1;
}

/* ===== LAB NEWS ===== */
.news-entry {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  padding: 1.5rem 0;
  border-bottom: 1px solid #eee;
}

.news-entry:last-child {
  border-bottom: none;
}

.news-photo {
  flex-shrink: 0;
  width: 200px;
}

.news-photo img {
  width: 100%;
  height: auto;
  display: block;
}

.news-text {
  flex: 1;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #1a1a1a;
  line-height: 1.85;
}

@media (max-width: 768px) {
  .news-entry {
    flex-direction: column;
  }

  .news-photo {
    width: 100%;
  }
}

/* ===== TEACHING ===== */
.teaching-list {
  list-style: none;
  padding: 0;
}

.teaching-entry {
  padding: 1.5rem 0;
  border-bottom: 1px solid #eee;
  display: flex;
  align-items: baseline;
  gap: 1rem;
}

.teaching-entry:last-child {
  border-bottom: none;
}

.course-number {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: #999;
}

.course-name {
  font-size: 1rem;
  font-weight: 500;
  color: #1a1a1a;
}

/* ===== EMPTY PAGE PLACEHOLDER ===== */
.placeholder-content {
  text-align: center;
  padding: 5rem 2rem;
  color: #bbb;
}

.placeholder-content p {
  font-size: 1rem;
  letter-spacing: 0.05em;
}

/* ===== FOOTER ===== */
footer {
  border-top: 1px solid #e0e0e0;
  padding: 2rem 3rem;
  text-align: center;
  background: #fafafa;
}

footer p {
  font-size: 0.75rem;
  color: #999;
  letter-spacing: 0.05em;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .nav-top {
    padding: 1rem 1.5rem 0.3rem;
  }

  .nav-top .lab-name {
    font-size: 1.2rem;
  }

  .menu-toggle {
    display: block;
  }

  nav ul {
    display: none;
    flex-direction: column;
    background: #fff;
    border-top: 1px solid #e8e8e8;
  }

  nav ul.open {
    display: flex;
  }

  nav ul li {
    flex: none;
    border-bottom: 1px solid #f0f0f0;
  }

  nav ul li a {
    padding: 0.75rem 1.5rem;
    text-align: left;
    font-size: 0.8rem;
  }

  nav ul li a::after {
    display: none;
  }

  main {
    margin-top: 120px;
  }

  .hero {
    padding: 2.5rem 1.5rem;
  }

  .hero h1 {
    font-size: 1.6rem;
  }

  .page-section {
    padding: 2rem 1.5rem 3rem;
  }

  .team-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .team-card .photo {
    width: 120px;
    height: auto;
  }

  .contact-content .contact-item {
    flex-direction: column;
    gap: 0.3rem;
  }
}

@media (max-width: 480px) {
  .gallery-grid {
    grid-template-columns: 1fr;
  }
}