/* ============================================
   Zhou Lab Website - Main Stylesheet
   University of Virginia Brand Colors
============================================ */

/* --- Variables --- */
:root {
  --uva-navy: #232d4b;
  --uva-orange: #e57200;
  --uva-blue: #0079b0;
  --uva-light-blue: #5b92c0;
  --uva-light-gray: #f5f5f5;
  --uva-mid-gray: #e0e0e0;
  --uva-dark-gray: #555555;
  --text-dark: #1a1a1a;
  --text-medium: #444444;
  --white: #ffffff;
  --font-heading: "Merriweather", Georgia, serif;
  --font-body: "Open Sans", Arial, sans-serif;
  --max-width: 1200px;
  --transition: 0.3s ease;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 18px;
}

body {
  font-family: var(--font-body);
  color: var(--text-dark);
  background: var(--white);
  line-height: 1.7;
}

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

a {
  color: var(--uva-blue);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover {
  color: var(--uva-orange);
}

h1,
h2,
h3,
h4,
h5 {
  font-family: var(--font-heading);
  line-height: 1.3;
  color: var(--uva-navy);
}

ul {
  list-style: none;
}

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

/* ============================================
   TOP BAR
============================================ */
/* ============================================
   HEADER / NAV
============================================ */
.site-header {
  background: var(--uva-navy);
  border-bottom: 3px solid var(--uva-orange);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 14px;
  line-height: 1;
}
.uva-som-logo {
  height: 48px;
  width: auto;
  display: block;
}
.logo-divider {
  width: 1px;
  height: 36px;
  background: rgba(255, 255, 255, 0.4);
}
.logo-lab-name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: -0.3px;
  white-space: nowrap;
}

/* Nav */
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.main-nav .nav-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--white);
  padding: 8px 12px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  transition:
    background var(--transition),
    color var(--transition);
  position: relative;
}
.main-nav .nav-link:hover,
.main-nav .nav-link.active {
  color: var(--uva-orange);
  background: rgba(255, 255, 255, 0.1);
}
.main-nav .nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 12px;
  right: 12px;
  height: 2px;
  background: var(--uva-orange);
  border-radius: 2px;
}

/* Hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  margin: 5px 0;
  transition: var(--transition);
}

/* ============================================
   HERO
============================================ */
.hero {
  position: relative;
  background: linear-gradient(
    135deg,
    var(--uva-navy) 0%,
    #1a2540 60%,
    #0d1a38 100%
  );
  color: var(--white);
  padding: 40px 24px 30px;
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='60' height='60'%3E%3Ccircle cx='30' cy='30' r='1.5' fill='rgba(255,255,255,0.04)'/%3E%3C/svg%3E")
    repeat;
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--uva-orange);
}
.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-text .eyebrow {
  display: inline-block;
  background: var(--uva-orange);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  padding: 4px 12px;
  border-radius: 2px;
  margin-bottom: 20px;
}
.hero-text h1 {
  font-size: 2.8rem;
  color: var(--white);
  margin-bottom: 16px;
  font-weight: 700;
}
.hero-text .tagline {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 28px;
  font-style: italic;
}
.hero-text p {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 32px;
  line-height: 1.8;
}
.hero-btns {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
}
.btn-primary {
  background: var(--uva-orange);
  color: var(--white);
  border-color: var(--uva-orange);
}
.btn-primary:hover {
  background: #c96200;
  border-color: #c96200;
  color: var(--white);
  transform: translateY(-2px);
}
.btn-outline {
  background: transparent;
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.6);
}
.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--white);
  color: var(--white);
}
.btn-navy {
  background: var(--uva-navy);
  color: var(--white);
  border-color: var(--uva-navy);
}
.btn-navy:hover {
  background: #1a2238;
  color: var(--white);
  transform: translateY(-2px);
}

/* Hero stats box */
.hero-stats {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  padding: 36px;
  backdrop-filter: blur(4px);
}
.hero-stats h3 {
  color: var(--white);
  font-size: 1.1rem;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}
.stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.stat-item {
  text-align: center;
}
.stat-item .number {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--uva-orange);
  display: block;
}
.stat-item .label {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.7);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.hero-disease-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}
.disease-tag {
  background: rgba(229, 114, 0, 0.2);
  border: 1px solid rgba(229, 114, 0, 0.4);
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.8rem;
  padding: 4px 12px;
  border-radius: 20px;
}

/* ============================================
   SECTION STYLES
============================================ */
section {
  padding: 72px 24px;
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-header h2 {
  font-size: 2rem;
  margin-bottom: 12px;
}
.section-header p {
  font-size: 1.05rem;
  color: var(--text-medium);
  max-width: 680px;
  margin: 0 auto;
}
.section-divider {
  width: 60px;
  height: 3px;
  background: var(--uva-orange);
  margin: 16px auto 0;
  border-radius: 2px;
}

/* ---- Mission Section ---- */
.mission-section {
  background: var(--uva-light-gray);
}
.mission-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 60px;
  align-items: start;
}
.mission-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--uva-orange);
  margin-bottom: 12px;
}
.mission-title {
  font-size: 1.8rem;
  color: var(--uva-navy);
  line-height: 1.3;
}
.mission-content p {
  font-size: 1.1rem;
  color: var(--text-medium);
  margin-bottom: 16px;
  line-height: 1.8;
}
.mission-bullets {
  margin: 20px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.mission-bullet {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--text-medium);
}
.mission-bullet::before {
  content: "▶";
  color: var(--uva-orange);
  font-size: 0.7rem;
  margin-top: 5px;
  flex-shrink: 0;
}

/* ---- Research Focus Cards ---- */
.research-section {
  background: var(--white);
}
.research-cards {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.research-card {
  border: 1px solid var(--uva-mid-gray);
  border-radius: 8px;
  padding: 32px 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.research-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--uva-navy);
  transition: background var(--transition);
}
.research-card:hover {
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
  transform: translateY(-4px);
}
.research-card:hover::before {
  background: var(--uva-orange);
}
.card-icon {
  font-size: 2.5rem;
  margin-bottom: 16px;
}
.research-card h3 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  color: var(--uva-navy);
}
.research-card p {
  font-size: 0.9rem;
  color: var(--text-medium);
  line-height: 1.7;
}
.card-link {
  display: inline-block;
  margin-top: 16px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--uva-blue);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.card-link::after {
  content: " →";
}

/* ---- Center Section ---- */
.center-section {
  background: linear-gradient(135deg, var(--uva-navy) 0%, #1a2540 100%);
  color: var(--white);
}
.center-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.center-text .eyebrow {
  display: inline-block;
  background: var(--uva-orange);
  color: var(--white);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  padding: 4px 12px;
  border-radius: 2px;
  margin-bottom: 16px;
}
.center-text h2 {
  color: var(--white);
  font-size: 1.9rem;
  margin-bottom: 16px;
}
.center-text p {
  color: rgba(255, 255, 255, 0.82);
  margin-bottom: 16px;
  font-size: 0.95rem;
  line-height: 1.8;
}
.pillars {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.pillar {
  display: flex;
  gap: 16px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 6px;
  padding: 16px 20px;
  align-items: flex-start;
}
.pillar-icon {
  font-size: 1.6rem;
  flex-shrink: 0;
}
.pillar-text h4 {
  color: var(--uva-orange);
  font-size: 0.95rem;
  margin-bottom: 4px;
}
.pillar-text p {
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.85rem;
  margin: 0;
}

/* ---- News Section ---- */
.news-section {
  background: var(--uva-light-gray);
}
.news-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.news-card {
  background: var(--white);
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  transition:
    box-shadow var(--transition),
    transform var(--transition);
}
.news-card:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  transform: translateY(-3px);
}
.news-card-category {
  background: var(--uva-navy);
  color: var(--white);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 6px 14px;
}
.news-card-body {
  padding: 20px;
}
.news-date {
  font-size: 0.78rem;
  color: var(--uva-dark-gray);
  margin-bottom: 8px;
}
.news-card h3 {
  font-size: 1rem;
  margin-bottom: 10px;
  color: var(--uva-navy);
  line-height: 1.4;
}
.news-card p {
  font-size: 0.875rem;
  color: var(--text-medium);
  line-height: 1.6;
}
.news-read-more {
  display: inline-block;
  margin-top: 12px;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--uva-blue);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.news-read-more::after {
  content: " →";
}
.section-footer {
  text-align: center;
  margin-top: 40px;
}

/* ---- People Preview ---- */
.people-section {
  background: var(--white);
}
.people-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.person-card {
  text-align: center;
  padding: 24px 16px;
  border-radius: 8px;
  border: 1px solid var(--uva-mid-gray);
  transition: all var(--transition);
}
.person-card:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
  transform: translateY(-3px);
}
.person-avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--uva-navy), var(--uva-blue));
  margin: 0 auto 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.8rem;
  font-weight: 700;
  font-family: var(--font-heading);
}
.person-card .person-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--uva-navy);
  margin-bottom: 4px;
}
.person-card .person-title {
  font-size: 0.8rem;
  color: var(--text-medium);
}
.person-card .person-role {
  display: inline-block;
  margin-top: 8px;
  font-size: 0.72rem;
  background: rgba(35, 45, 75, 0.1);
  color: var(--uva-navy);
  padding: 2px 10px;
  border-radius: 20px;
  font-weight: 600;
}

/* ============================================
   INTERNAL PAGE HERO (subpages)
============================================ */
.page-hero {
  background: linear-gradient(135deg, var(--uva-navy) 0%, #1a2540 100%);
  color: var(--white);
  padding: 40px 30px;
  position: relative;
}
.page-hero::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--uva-orange);
}
.page-hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}
.page-hero .breadcrumb {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 12px;
}
.page-hero .breadcrumb a {
  color: rgba(255, 255, 255, 0.6);
}
.page-hero .breadcrumb a:hover {
  color: var(--white);
}
.page-hero h1 {
  font-size: 2.4rem;
  color: var(--white);
  margin-bottom: 12px;
}
.page-hero p {
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.82);
  max-width: 680px;
}

/* ============================================
   RESEARCH PAGE
============================================ */
.research-intro {
  max-width: var(--max-width);
  margin: 0 auto;
}
.research-disease {
  background: var(--uva-light-gray);
}
.disease-tabs {
  max-width: var(--max-width);
  margin: 0 auto;
}
.tab-nav {
  display: flex;
  gap: 4px;
  margin-bottom: 32px;
  border-bottom: 2px solid var(--uva-mid-gray);
}
.tab-btn {
  background: none;
  border: none;
  padding: 12px 24px;
  cursor: pointer;
  font-family: var(--font-heading);
  font-size: 0.95rem;
  color: var(--text-medium);
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: all var(--transition);
}
.tab-btn:hover {
  color: var(--uva-navy);
}
.tab-btn.active {
  color: var(--uva-navy);
  border-bottom-color: var(--uva-orange);
  font-weight: 700;
}
.tab-panel {
  display: none;
}
.tab-panel.active {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.tab-panel h3 {
  font-size: 1.4rem;
  color: var(--uva-navy);
  margin-bottom: 12px;
}
.tab-panel p {
  font-size: 0.95rem;
  color: var(--text-medium);
  margin-bottom: 12px;
  line-height: 1.8;
}
.tab-panel ul {
  list-style: disc;
  padding-left: 20px;
  color: var(--text-medium);
  font-size: 0.95rem;
}
.tab-panel ul li {
  margin-bottom: 8px;
  line-height: 1.6;
}
.disease-badge {
  display: inline-block;
  background: var(--uva-navy);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 4px 12px;
  border-radius: 4px;
  margin-bottom: 12px;
}

.approach-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.approach-card {
  text-align: center;
  padding: 28px 20px;
  border-radius: 8px;
  background: var(--uva-light-gray);
  transition: all var(--transition);
}
.approach-card:hover {
  background: var(--uva-navy);
}
.approach-card:hover h3,
.approach-card:hover p {
  color: var(--white);
}
.approach-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
}
.approach-card h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}
.approach-card p {
  font-size: 0.85rem;
  color: var(--text-medium);
}

/* ============================================
   PEOPLE PAGE
============================================ */
.pi-section {
  background: var(--white);
}
.pi-profile {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  align-items: start;
}
.pi-photo {
  width: 100%;
  aspect-ratio: 3/4;
  background: linear-gradient(135deg, var(--uva-navy) 0%, var(--uva-blue) 100%);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 5rem;
  font-weight: 700;
  font-family: var(--font-heading);
  position: relative;
  overflow: hidden;
}
.pi-photo::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--uva-orange);
}
.pi-info h2 {
  font-size: 1.9rem;
  color: var(--uva-navy);
  margin-bottom: 4px;
}
.pi-credentials {
  font-size: 0.85rem;
  color: var(--uva-dark-gray);
  margin-bottom: 20px;
}
.pi-titles {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 20px;
}
.pi-title-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-medium);
}
.pi-title-item::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--uva-orange);
  flex-shrink: 0;
}
.pi-bio {
  font-size: 0.95rem;
  color: var(--text-medium);
  line-height: 1.8;
}
.pi-bio p {
  margin-bottom: 14px;
}
.pi-contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}
.pi-contact-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--uva-blue);
  padding: 6px 14px;
  border: 1px solid var(--uva-blue);
  border-radius: 4px;
  transition: all var(--transition);
}
.pi-contact-link:hover {
  background: var(--uva-blue);
  color: var(--white);
}

.team-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.team-card {
  border: 1px solid var(--uva-mid-gray);
  border-radius: 8px;
  padding: 28px 24px;
  transition: all var(--transition);
}
.team-card:hover {
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
  transform: translateY(-4px);
  border-color: var(--uva-orange);
}
.team-avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--uva-blue), var(--uva-light-blue));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-weight: 700;
  font-size: 1.4rem;
  font-family: var(--font-heading);
  margin-bottom: 14px;
}
.team-card .person-name {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--uva-navy);
  margin-bottom: 4px;
}
.team-card .person-role {
  font-size: 0.82rem;
  color: var(--uva-orange);
  font-weight: 600;
}
.team-card .person-focus {
  font-size: 0.85rem;
  color: var(--text-medium);
  margin-top: 8px;
}

/* ============================================
   PUBLICATIONS PAGE
============================================ */
.publications-list {
  max-width: var(--max-width);
  margin: 0 auto;
}
.pub-year-group {
  margin-bottom: 40px;
}
.pub-year {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--uva-orange);
  border-bottom: 2px solid var(--uva-mid-gray);
  padding-bottom: 8px;
  margin-bottom: 16px;
}
.pub-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--uva-mid-gray);
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text-medium);
}
.pub-item:last-child {
  border-bottom: none;
}
.pub-authors {
  margin-bottom: 4px;
}
.pub-title {
  font-weight: 700;
  color: var(--uva-navy);
  margin-bottom: 4px;
}
.pub-journal {
  font-style: italic;
}
.pub-links {
  margin-top: 8px;
  display: flex;
  gap: 10px;
}
.pub-link {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--uva-blue);
  padding: 2px 8px;
  border: 1px solid var(--uva-blue);
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.pub-link:hover {
  background: var(--uva-blue);
  color: var(--white);
}

/* ============================================
   CENTER PAGE
============================================ */
.center-hero-content {
  max-width: var(--max-width);
  margin: 0 auto;
}
.center-pillars-section {
  background: var(--uva-light-gray);
}
.pillars-full-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.pillar-full-card {
  background: var(--white);
  border-radius: 8px;
  padding: 32px 28px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  border-top: 4px solid var(--uva-navy);
  transition: all var(--transition);
}
.pillar-full-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
  border-top-color: var(--uva-orange);
}
.pillar-full-card .pillar-icon-lg {
  font-size: 3rem;
  margin-bottom: 16px;
}
.pillar-full-card h3 {
  font-size: 1.25rem;
  color: var(--uva-navy);
  margin-bottom: 12px;
}
.pillar-full-card p {
  font-size: 0.9rem;
  color: var(--text-medium);
  line-height: 1.7;
  margin-bottom: 12px;
}
.pillar-full-card ul {
  list-style: disc;
  padding-left: 18px;
  color: var(--text-medium);
  font-size: 0.88rem;
}
.pillar-full-card ul li {
  margin-bottom: 6px;
  line-height: 1.6;
}

.impact-banner {
  background: var(--uva-orange);
  color: var(--white);
  padding: 48px 24px;
  text-align: center;
}
.impact-banner h2 {
  color: var(--white);
  font-size: 1.8rem;
  margin-bottom: 12px;
}
.impact-banner p {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.9);
  max-width: 680px;
  margin: 0 auto 24px;
}

/* ============================================
   JOIN / CONTACT PAGE
============================================ */
.join-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}
.opportunity-card {
  background: var(--white);
  border: 1px solid var(--uva-mid-gray);
  border-radius: 8px;
  padding: 28px 24px;
  margin-bottom: 20px;
  border-left: 4px solid var(--uva-orange);
}
.opportunity-card h3 {
  font-size: 1.1rem;
  color: var(--uva-navy);
  margin-bottom: 8px;
}
.opportunity-card p {
  font-size: 0.9rem;
  color: var(--text-medium);
  line-height: 1.7;
}

.contact-info-box {
  background: var(--uva-navy);
  color: var(--white);
  border-radius: 8px;
  padding: 32px 28px;
  margin-bottom: 20px;
}
.contact-info-box h3 {
  color: var(--white);
  font-size: 1.2rem;
  margin-bottom: 20px;
}
.contact-item {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.85);
}
.contact-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
}

/* ============================================
   FOOTER
============================================ */
.site-footer {
  background: var(--uva-navy);
  color: rgba(255, 255, 255, 0.75);
  padding: 48px 24px 24px;
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-brand .lab-name {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 8px;
}
.footer-brand p {
  font-size: 0.85rem;
  line-height: 1.7;
  margin-bottom: 16px;
}
.footer-social {
  display: flex;
  gap: 10px;
}
.social-link {
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.7);
  font-size: 1rem;
  transition: all var(--transition);
  text-decoration: none;
}
.social-link:hover {
  background: var(--uva-orange);
  color: var(--white);
}

.footer-col h4 {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  color: var(--white);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
}
.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-col ul li a {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.65);
  transition: color var(--transition);
}
.footer-col ul li a:hover {
  color: var(--white);
}

.footer-bottom {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.5);
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom-links {
  display: flex;
  gap: 20px;
}
.footer-bottom-links a {
  color: rgba(255, 255, 255, 0.5);
}
.footer-bottom-links a:hover {
  color: rgba(255, 255, 255, 0.8);
}

.uva-logos {
  display: flex;
  gap: 16px;
  align-items: center;
  margin-top: 16px;
}
.uva-logo-badge {
  padding: 4px 12px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.7);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ============================================
   UTILITIES
============================================ */
.text-center {
  text-align: center;
}
.mt-8 {
  margin-top: 8px;
}
.mt-16 {
  margin-top: 16px;
}
.mt-24 {
  margin-top: 24px;
}
.mb-24 {
  margin-bottom: 24px;
}
.highlight-orange {
  color: var(--uva-orange);
}
.bg-light {
  background: var(--uva-light-gray);
}

.info-banner {
  background: rgba(0, 121, 176, 0.08);
  border-left: 4px solid var(--uva-blue);
  border-radius: 0 6px 6px 0;
  padding: 16px 20px;
  font-size: 1.2rem;
  color: var(--text-medium);
  margin: 20px 0;
}

/* ============================================
   RESPONSIVE
============================================ */
@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-stats {
    max-width: 520px;
  }
  .research-cards {
    grid-template-columns: repeat(2, 1fr);
  }
  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .people-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
  .pillars-full-grid {
    grid-template-columns: 1fr 1fr;
  }
  .pi-profile {
    grid-template-columns: 220px 1fr;
  }
  .team-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .hero-text h1 {
    font-size: 2rem;
  }
  .mission-inner {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .research-cards {
    grid-template-columns: 1fr;
  }
  .center-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .news-grid {
    grid-template-columns: 1fr;
  }
  .people-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .team-grid {
    grid-template-columns: 1fr;
  }
  .pi-profile {
    grid-template-columns: 1fr;
  }
  .pi-photo {
    aspect-ratio: 1;
    max-width: 200px;
  }
  .join-grid {
    grid-template-columns: 1fr;
  }
  .pillars-full-grid {
    grid-template-columns: 1fr;
  }
  .approach-grid {
    grid-template-columns: 1fr;
  }
  .footer-inner {
    grid-template-columns: 1fr;
  }
  .tab-panel.active {
    grid-template-columns: 1fr;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 12px 0;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    border-top: 2px solid var(--uva-orange);
    gap: 0;
  }
  .main-nav.open {
    display: flex;
  }
  .main-nav .nav-link {
    width: 100%;
    border-radius: 0;
    padding: 12px 24px;
  }
  .nav-toggle {
    display: block;
  }
  .site-header {
    position: relative;
  }
  .header-inner {
    position: relative;
  }
}