/* ===================================
   RAIN Lab Main Styles
   =================================== */

/* ============= Global Styles ============= */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: var(--color-primary-dark);
}

/* ============= Typography ============= */

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-navy);
  margin-bottom: var(--space-md);
}

h1 {
  font-size: var(--font-size-4xl);
}

h2 {
  font-size: var(--font-size-3xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

h5 {
  font-size: var(--font-size-lg);
}

h6 {
  font-size: var(--font-size-base);
}

p {
  margin-bottom: var(--space-sm);
}

/* ============= Container ============= */

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

/* ============= Section Styles ============= */

section {
  padding: var(--section-padding-vertical) 0;
}

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

.section-title {
  text-align: center;
  margin-bottom: var(--space-2xl);
  position: relative;
}

.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: var(--gradient-primary);
  margin: var(--space-md) auto 0;
  border-radius: var(--border-radius-sm);
}

/* ============= Header & Navigation ============= */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-index-fixed);
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-xs);
  padding-bottom: var(--space-xs);
}

.logo-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.logo {
  height: 100px;
  width: auto;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
  align-items: center;
}

.nav-menu a {
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--border-radius-sm);
  position: relative;
  transition: color var(--transition-base);
}

.nav-menu a:hover {
  color: var(--color-primary);
}

.nav-menu a.active {
  color: var(--color-primary);
  font-weight: var(--font-weight-bold);
}

.nav-menu a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: var(--space-sm);
  right: var(--space-sm);
  height: 2px;
  background-color: var(--color-primary);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  z-index: var(--z-index-modal);
}

.menu-toggle span {
  display: block;
  width: 25px;
  height: 3px;
  background-color: var(--color-navy);
  margin: 5px 0;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* ============= Hero Section ============= */

.hero {
  min-height: 85vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--gradient-primary);
  color: var(--color-white);
  padding: 120px 20px 80px; /* Account for fixed header */
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="rgba(255,255,255,0.05)" d="M0,96L48,112C96,128,192,160,288,165.3C384,171,480,149,576,133.3C672,117,768,107,864,122.7C960,139,1056,181,1152,181.3C1248,181,1344,139,1392,117.3L1440,96L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') no-repeat bottom;
  background-size: cover;
  opacity: 0.3;
}

.hero-content {
  position: relative;
  z-index: 1;
  animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero h1 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  margin-bottom: var(--space-sm);
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-lg);
  opacity: 0.95;
}

.hero-description {
  font-size: var(--font-size-lg);
  max-width: 700px;
  margin: 0 auto var(--space-xl);
  line-height: var(--line-height-loose);
  opacity: 0.9;
}

.hero-cta {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ============= Buttons ============= */

.btn {
  display: inline-block;
  padding: var(--space-sm) var(--space-xl);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  text-align: center;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  border: 2px solid transparent;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-white);
}

.btn-primary:hover {
  background-color: transparent;
  color: var(--color-white);
  border-color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-white);
  border-color: var(--color-white);
}

.btn-secondary:hover {
  background-color: var(--color-white);
  color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-link {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--font-size-sm);
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--border-radius-sm);
}

.btn-link:hover {
  background-color: var(--color-primary-dark);
  color: var(--color-white);
  transform: translateY(-1px);
}

/* ============= Research Leader Section ============= */

.research-leader {
  background-color: var(--color-background-alt);
}

.leader-content {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--space-3xl);
  align-items: start;
}

.leader-image-container {
  text-align: center;
}

.leader-image {
  width: 300px;
  height: 300px;
  border-radius: var(--border-radius-full);
  object-fit: cover;
  box-shadow: var(--shadow-xl);
  margin: 0 auto;
}

.leader-info h2 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-xs);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.leader-title {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  font-weight: var(--font-weight-medium);
}

.leader-credentials {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.research-interests {
  margin: var(--space-lg) 0;
}

.research-interests h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-md);
}

.interests-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.interest-tag {
  padding: var(--space-xs) var(--space-md);
  background-color: var(--color-white);
  border: 1px solid var(--color-border-gray);
  border-radius: var(--border-radius-lg);
  font-size: var(--font-size-sm);
  color: var(--color-navy);
  font-weight: var(--font-weight-medium);
}

.leader-bio {
  margin: var(--space-lg) 0;
}

.leader-bio p {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-loose);
  margin-bottom: var(--space-md);
  color: var(--color-text-primary);
}

.leader-links {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  margin-top: var(--space-xl);
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  background-color: var(--color-white);
  border: 1px solid var(--color-border-gray);
  border-radius: var(--border-radius-md);
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-base);
}

.social-link:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ============= Team Members Section ============= */

/* PI Section - Centered at top */
.pi-section {
  display: flex;
  justify-content: center;
  margin-bottom: var(--space-3xl);
}

.pi-section .member-card {
  max-width: 750px;
  width: 100%;
  display: flex;
  flex-direction: row;
}

.pi-section .member-image {
  width: 260px;
  min-width: 260px;
  height: auto;
  object-fit: cover;
  object-position: top center;
}

/* All other members grid */
.members-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xl);
  justify-content: center;
}

.members-grid .member-card {
  width: 280px;
  flex-shrink: 0;
}

.member-card {
  background-color: var(--color-white);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.member-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.member-image {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.member-info {
  padding: var(--space-lg);
}

.member-name {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-navy);
  margin-bottom: var(--space-xs);
}

.member-role {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  font-weight: var(--font-weight-medium);
}

.member-bio {
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-md);
}

.member-links {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.member-bio.truncated {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.bio-toggle {
  background: none;
  border: none;
  color: var(--color-primary);
  font-size: var(--font-size-sm);
  cursor: pointer;
  padding: 0;
  margin-bottom: var(--space-md);
}

.bio-toggle:hover {
  text-decoration: underline;
}

.member-links .btn-link {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  font-size: 18px;
  flex-shrink: 0;
}

/* ============= Publications Section ============= */

.publications-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
  gap: var(--space-md);
}

.filter-container {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.filter-label {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.year-filter {
  padding: var(--space-sm) var(--space-lg);
  border: 1px solid var(--color-border-gray);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-base);
  font-family: var(--font-primary);
  background-color: var(--color-white);
  cursor: pointer;
  transition: border-color var(--transition-base);
}

.year-filter:hover,
.year-filter:focus {
  border-color: var(--color-primary);
  outline: none;
}

.publications-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.publication-item {
  background-color: var(--color-white);
  padding: var(--space-xl);
  border-radius: var(--border-radius-lg);
  border-left: 4px solid var(--color-primary);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.publication-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.publication-header {
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
}

.year-badge {
  flex-shrink: 0;
  width: 60px;
  height: 60px;
  border-radius: var(--border-radius-full);
  background: var(--gradient-primary);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
}

.publication-content {
  flex: 1;
}

.publication-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-navy);
  margin-bottom: var(--space-sm);
  line-height: var(--line-height-normal);
}

.publication-authors {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-sm);
}

.author-highlight {
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}

.publication-venue {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-md);
}

.venue-icon {
  width: 20px;
  height: 20px;
}

.publication-links {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-top: var(--space-md);
}

/* ============= News Section ============= */

.news-grid {
  display: grid;
  gap: var(--space-xl);
}

.news-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-lg);
  padding: var(--space-xl);
  background-color: var(--color-white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.news-item:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.news-date {
  flex-shrink: 0;
  width: 80px;
  height: 80px;
  border-radius: var(--border-radius-md);
  background: var(--gradient-primary);
  color: var(--color-white);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
}

.news-day {
  font-size: var(--font-size-2xl);
  line-height: 1;
}

.news-month {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.news-content h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-sm);
  color: var(--color-navy);
}

.news-description {
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-md);
}

.news-link {
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}

.news-link:hover {
  color: var(--color-primary-dark);
}

/* ============= Alumni Section ============= */

.alumni-year-group {
  margin-bottom: var(--space-2xl);
}

.alumni-year-heading {
  font-size: var(--font-size-2xl);
  color: var(--color-navy);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-border-gray);
}

.alumni-list {
  display: grid;
  gap: var(--space-md);
}

.alumni-item {
  padding: var(--space-lg);
  background-color: var(--color-white);
  border-radius: var(--border-radius-md);
  border-left: 3px solid var(--color-primary);
  transition: all var(--transition-base);
}

.alumni-item:hover {
  box-shadow: var(--shadow-sm);
  transform: translateX(4px);
}

.alumni-name {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-navy);
  margin-bottom: var(--space-xs);
}

.alumni-details {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.alumni-current {
  font-size: var(--font-size-base);
  color: var(--color-text-primary);
  font-style: italic;
}

/* ============= Footer ============= */

.footer {
  background-color: var(--color-navy);
  color: var(--color-white);
  padding: var(--space-3xl) 0 var(--space-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer-section h3 {
  color: var(--color-white);
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-md);
}

.footer-section p,
.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  line-height: var(--line-height-loose);
}

.footer-section a:hover {
  color: var(--color-white);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: var(--space-sm);
}

.footer-social {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-full);
  background-color: rgba(255, 255, 255, 0.1);
  transition: all var(--transition-base);
}

.footer-social a:hover {
  background-color: var(--color-primary);
  transform: translateY(-2px);
}

.footer-bottom {
  padding-top: var(--space-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--font-size-sm);
}

/* ============= Utility Classes ============= */

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

.hidden {
  display: none !important;
}

.fade-in {
  animation: fadeIn var(--transition-slow);
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* ============= Loading States ============= */

.loading {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--color-text-secondary);
  font-style: italic;
}