/* ============================================
   NEXUS INSTITUTE — Research Lab Website
   Pure CSS (no framework)
   ============================================ */

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

:root {
  --color-navy:      #0D2340;
  --color-navy-mid:  #1A3A5C;
  --color-blue:      #1E5FA8;
  --color-blue-light:#2E7DD4;
  --color-teal:      #0E8A7E;
  --color-gold:      #D4930A;
  --color-gold-light:#F0B429;
  --color-off-white: #F7F9FC;
  --color-white:     #FFFFFF;
  --color-gray-100:  #EEF1F6;
  --color-gray-200:  #D8DEE9;
  --color-gray-400:  #8B9BB4;
  --color-gray-600:  #4A5568;
  --color-gray-800:  #1A2332;
  --color-text:      #1A2332;
  --color-text-light:#4A5568;

  --font-sans:  'Inter', system-ui, -apple-system, sans-serif;
  --font-serif: 'Lora', Georgia, serif;

  --max-width: 1200px;
  --gutter: 2rem;
  --radius: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow:    0 4px 16px rgba(0,0,0,0.1), 0 2px 6px rgba(0,0,0,0.06);
  --shadow-lg: 0 16px 40px rgba(0,0,0,0.12), 0 4px 12px rgba(0,0,0,0.08);

  --transition: 0.2s ease;
  --transition-slow: 0.4s ease;
}

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-white);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul { list-style: none; }

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

/* ---------- Typography ---------- */
h1, h2, h3, h4 { line-height: 1.2; font-weight: 700; }
h1 { font-size: clamp(2.5rem, 5vw, 4.5rem); }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.75rem); }
h3 { font-size: clamp(1.1rem, 2vw, 1.4rem); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-full);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-blue);
  color: var(--color-white);
  border-color: var(--color-blue);
}
.btn-primary:hover {
  background: var(--color-blue-light);
  border-color: var(--color-blue-light);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(30, 95, 168, 0.35);
}

.btn-outline {
  background: transparent;
  color: var(--color-blue);
  border-color: var(--color-blue);
}
.btn-outline:hover {
  background: var(--color-blue);
  color: var(--color-white);
  transform: translateY(-1px);
}

.btn-full { width: 100%; justify-content: center; }

/* ---------- Section Headers ---------- */
.section-eyebrow {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-teal);
  margin-bottom: 0.75rem;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 4rem;
}
.section-header .section-title {
  color: var(--color-navy);
  margin-bottom: 1rem;
}
.section-description {
  color: var(--color-text-light);
  font-size: 1.0625rem;
  line-height: 1.7;
}

/* ============================================
   NAVIGATION
   ============================================ */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: all var(--transition);
}

.site-header.scrolled {
  border-bottom-color: var(--color-gray-200);
  box-shadow: var(--shadow-sm);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo — wordmark */
.logo {
  display: inline-flex;
  align-items: baseline;
  gap: 0.3em;
  text-decoration: none;
  line-height: 1;
}
.logo-word-nexus {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-navy);
}
.logo-word-institute {
  font-family: var(--font-sans);
  font-size: 1.25rem;
  font-weight: 300;
  letter-spacing: 0.01em;
  color: var(--color-navy);
}

/* Nav Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-link {
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-full);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-gray-600);
  transition: all var(--transition);
}
.nav-link:hover {
  color: var(--color-navy);
  background: var(--color-gray-100);
}

.nav-cta {
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  background: var(--color-navy);
  color: white;
  font-size: 0.9375rem;
  font-weight: 600;
  transition: all var(--transition);
  margin-left: 0.5rem;
}
.nav-cta:hover {
  background: var(--color-blue);
  transform: translateY(-1px);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-navy);
  border-radius: 2px;
  transition: all var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================
   HERO
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--color-navy);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 70% 50%, rgba(30,95,168,0.4) 0%, transparent 60%),
    radial-gradient(ellipse 50% 80% at 20% 80%, rgba(14,138,126,0.25) 0%, transparent 50%),
    radial-gradient(ellipse 40% 40% at 80% 20%, rgba(212,147,10,0.12) 0%, transparent 50%);
}

.hero-particles {
  position: absolute;
  inset: 0;
}

.particle {
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  animation: float var(--dur, 8s) ease-in-out infinite var(--delay, 0s);
}

@keyframes float {
  0%, 100% { transform: translateY(0) translateX(0); opacity: 0.08; }
  33% { transform: translateY(-20px) translateX(10px); opacity: 0.15; }
  66% { transform: translateY(10px) translateX(-8px); opacity: 0.05; }
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 10rem var(--gutter) 6rem;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.hero-eyebrow {
  display: inline-block;
  padding: 0.375rem 1rem;
  background: rgba(14,138,126,0.2);
  border: 1px solid rgba(14,138,126,0.4);
  color: #4ECDC4;
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.2s forwards;
}

.hero-headline {
  color: var(--color-white);
  font-size: clamp(3rem, 6vw, 5.5rem);
  line-height: 1.1;
  font-weight: 800;
  margin-bottom: 1.5rem;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.4s forwards;
}
.hero-accent {
  color: var(--color-gold-light);
  font-style: italic;
  font-family: var(--font-serif);
}

.hero-description {
  color: rgba(255,255,255,0.75);
  font-size: clamp(1rem, 2vw, 1.1875rem);
  line-height: 1.75;
  max-width: 560px;
  margin-bottom: 2.5rem;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.6s forwards;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 4rem;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.8s forwards;
}
.hero .btn-outline {
  color: rgba(255,255,255,0.85);
  border-color: rgba(255,255,255,0.35);
}
.hero .btn-outline:hover {
  background: rgba(255,255,255,0.15);
  color: white;
  border-color: rgba(255,255,255,0.6);
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 0;
  opacity: 0;
  animation: fadeUp 0.8s ease 1s forwards;
}
.stat {
  display: flex;
  flex-direction: column;
  padding: 0 2rem 0 0;
}
.stat:first-child { padding-left: 0; }
.stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-white);
  line-height: 1;
}
.stat-label {
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.55);
  font-weight: 500;
  margin-top: 0.25rem;
}
.stat-divider {
  width: 1px;
  height: 40px;
  background: rgba(255,255,255,0.2);
  margin-right: 2rem;
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 2.5rem;
  right: var(--gutter);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  color: rgba(255,255,255,0.4);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  writing-mode: vertical-rl;
  opacity: 0;
  animation: fadeIn 1s ease 1.5s forwards;
}
.scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, rgba(255,255,255,0.4), transparent);
  animation: scrollLine 2s ease-in-out infinite;
}
@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ============================================
   MISSION STRIP
   ============================================ */
.mission {
  background: var(--color-off-white);
  border-top: 4px solid var(--color-gold);
  padding: 5rem 0;
}
.mission-quote {
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  line-height: 1.6;
  color: var(--color-navy);
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  font-style: italic;
  font-weight: 400;
  quotes: "\201C" "\201D";
}
.mission-quote::before { content: open-quote; color: var(--color-gold); }
.mission-quote::after  { content: close-quote; color: var(--color-gold); }

/* ============================================
   RESEARCH AREAS
   ============================================ */
.research {
  padding: 7rem 0;
  background: var(--color-white);
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.research-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-slow);
  display: flex;
  flex-direction: column;
}
.research-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-blue);
}

.research-card-image {
  height: 200px;
  position: relative;
  overflow: hidden;
}
.research-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
  transition: transform 0.5s ease;
}
.research-card:hover .research-card-image img {
  transform: scale(1.04);
}

.research-card-body {
  padding: 2rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.research-card-body h3 {
  color: var(--color-navy);
  margin-bottom: 0.75rem;
}
.research-card-body p {
  color: var(--color-text-light);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: 1.25rem;
  flex: 1;
}

.research-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}
.research-topics li {
  padding: 0.25rem 0.75rem;
  background: var(--color-gray-100);
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-gray-600);
}

.research-link {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-blue);
  transition: color var(--transition);
}
.research-link:hover { color: var(--color-blue-light); }

/* ============================================
   PUBLICATIONS
   ============================================ */
.publications {
  padding: 7rem 0;
  background: var(--color-navy);
}

.publications .section-header .section-eyebrow { color: #4ECDC4; }
.publications .section-title { color: var(--color-white); }
.publications .section-description { color: rgba(255,255,255,0.6); }

.publications-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.publication-item {
  padding: 2rem 2.5rem;
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  transition: background var(--transition);
}
.publication-item:last-child { border-bottom: none; }
.publication-item:hover { background: rgba(255,255,255,0.06); }

.pub-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.pub-tag {
  display: inline-block;
  padding: 0.2rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.publication-item:nth-child(1) .pub-tag { background: rgba(30,95,168,0.25); color: #60A5FA; }
.publication-item:nth-child(2) .pub-tag { background: rgba(14,138,126,0.25); color: #4ECDC4; }
.publication-item:nth-child(3) .pub-tag { background: rgba(69,69,200,0.25); color: #A78BFA; }
.publication-item:nth-child(4) .pub-tag { background: rgba(212,147,10,0.25); color: var(--color-gold-light); }

.pub-date {
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.4);
}

.pub-title {
  color: var(--color-white);
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 0.5rem;
}

.pub-authors {
  color: rgba(255,255,255,0.5);
  font-size: 0.875rem;
  margin-bottom: 0.25rem;
}

.pub-journal {
  color: rgba(255,255,255,0.35);
  font-size: 0.8125rem;
  font-style: italic;
  margin-bottom: 1rem;
}

.pub-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: #60A5FA;
  transition: color var(--transition);
}
.pub-link:hover { color: white; }

.publications-footer {
  text-align: center;
  margin-top: 3rem;
}
.publications .btn-outline {
  color: rgba(255,255,255,0.8);
  border-color: rgba(255,255,255,0.3);
}
.publications .btn-outline:hover {
  background: rgba(255,255,255,0.1);
  color: white;
  border-color: rgba(255,255,255,0.6);
}

/* ============================================
   TOOLS & DATA SECTION
   ============================================ */
.tools-section {
  padding: 7rem 0;
  background: var(--color-off-white);
}

.tools-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: center;
}

.tools-text .section-title {
  color: var(--color-navy);
  margin-bottom: 1.25rem;
}
.tools-text > p {
  color: var(--color-text-light);
  font-size: 1.0625rem;
  line-height: 1.75;
  margin-bottom: 2.5rem;
}

.tools-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}
.tools-list li {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}
.tool-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
  margin-top: 0.1rem;
}
.tools-list strong {
  display: block;
  font-size: 1rem;
  color: var(--color-navy);
  margin-bottom: 0.25rem;
}
.tools-list span {
  font-size: 0.9375rem;
  color: var(--color-text-light);
}

/* Tools Photo */
.tools-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.tools-photo {
  width: 100%;
  aspect-ratio: 1;
  max-width: 480px;
  border-radius: 2rem;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.tools-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}

/* ============================================
   TEAM
   ============================================ */
.team {
  padding: 7rem 0;
  background: var(--color-white);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.team-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all var(--transition-slow);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.team-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-blue);
}

.team-avatar {
  position: relative;
  width: 64px;
  height: 64px;
}

.avatar-circle {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: linear-gradient(
    135deg,
    hsl(var(--hue) 60% 25%),
    hsl(var(--hue) 70% 50%)
  );
  display: flex;
  align-items: center;
  justify-content: center;
}

.team-avatar::after {
  content: attr(data-initials);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.9);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: 0.04em;
}

.team-info h3 {
  color: var(--color-navy);
  font-size: 1.0625rem;
  margin-bottom: 0.25rem;
}
.team-title {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-teal);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem !important;
}
.team-bio {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.65;
  margin-bottom: 1rem !important;
  flex: 1;
}
.team-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-blue);
  transition: color var(--transition);
}
.team-link:hover { color: var(--color-blue-light); }

.team-footer {
  text-align: center;
  margin-top: 3.5rem;
}

/* ============================================
   NEWS
   ============================================ */
.news {
  padding: 7rem 0;
  background: var(--color-off-white);
}

.news-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  grid-template-rows: auto auto;
  gap: 1.5rem;
}

.news-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition-slow);
  display: flex;
  flex-direction: column;
}
.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.news-card-featured {
  grid-row: 1 / 3;
}

.news-card-image {
  height: 220px;
  position: relative;
  overflow: hidden;
}
.news-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
  transition: transform 0.5s ease;
}
.news-card:hover .news-card-image img {
  transform: scale(1.04);
}

.news-card-body {
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  flex: 1;
}

.news-tag {
  display: inline-block;
  padding: 0.2rem 0.75rem;
  border-radius: var(--radius-full);
  background: var(--color-gray-100);
  color: var(--color-blue);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  align-self: flex-start;
}

.news-card h3 {
  color: var(--color-navy);
  font-size: 1.05rem;
  line-height: 1.4;
}
.news-card-featured h3 {
  font-size: 1.3rem;
}

.news-card p {
  color: var(--color-text-light);
  font-size: 0.9375rem;
  line-height: 1.65;
  flex: 1;
}

.news-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8125rem;
  color: var(--color-gray-400);
  margin-top: auto;
  padding-top: 0.75rem;
  border-top: 1px solid var(--color-gray-100);
}

.news-link {
  font-weight: 600;
  color: var(--color-blue);
  transition: color var(--transition);
}
.news-link:hover { color: var(--color-blue-light); }

/* ============================================
   CONTACT
   ============================================ */
.contact {
  padding: 7rem 0;
  background: var(--color-white);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 6rem;
  align-items: start;
}

.contact-info .section-title {
  color: var(--color-navy);
  margin-bottom: 1rem;
}
.contact-info > p {
  color: var(--color-text-light);
  font-size: 1.0625rem;
  line-height: 1.75;
  margin-bottom: 2rem;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 2.5rem;
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 0.875rem;
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.6;
}
.contact-item svg {
  color: var(--color-teal);
  flex-shrink: 0;
  margin-top: 2px;
}

.contact-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* About Block */
.about-block {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.about-photo {
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 16 / 9;
}
.about-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  background: var(--color-off-white);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  border: 1px solid var(--color-gray-200);
}
.about-stat {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.stat-number {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-navy);
  line-height: 1;
  letter-spacing: -0.02em;
}
.stat-label {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--color-text-light);
}

.about-text {
  font-size: 0.9375rem;
  color: var(--color-text-light);
  line-height: 1.8;
  margin: 0;
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  background: var(--color-gray-800);
  color: rgba(255,255,255,0.55);
  padding: 5rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 4rem;
}

.footer-brand .logo-word-nexus { color: white; }
.footer-brand .logo-word-institute { color: rgba(255,255,255,0.55); }

.footer-brand > p {
  margin-top: 1rem;
  font-size: 0.9375rem;
  line-height: 1.7;
  max-width: 260px;
}

.footer-social {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
}
.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.55);
  transition: all var(--transition);
}
.footer-social a:hover {
  background: rgba(255,255,255,0.16);
  color: white;
}

.footer-links h4 {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.7);
  margin-bottom: 1.25rem;
}
.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.footer-links a {
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.45);
  transition: color var(--transition);
}
.footer-links a:hover { color: white; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}
.footer-bottom p { font-size: 0.875rem; }
.footer-bottom-links {
  display: flex;
  gap: 1.5rem;
}
.footer-bottom-links a {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.35);
  transition: color var(--transition);
}
.footer-bottom-links a:hover { color: rgba(255,255,255,0.7); }

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ============================================
   RESPONSIVE
   ============================================ */
/* ── 1024 px ─────────────────────────────────── */
@media (max-width: 1024px) {
  .research-grid { grid-template-columns: 1fr 1fr; }
  .team-grid     { grid-template-columns: repeat(2, 1fr); }
  .tools-grid    { grid-template-columns: 1fr; gap: 3rem; }
  .news-grid     { grid-template-columns: 1fr; }
  .news-card-featured { grid-row: auto; }
  .contact-grid  { grid-template-columns: 1fr; gap: 3rem; }
  .footer-grid   { grid-template-columns: 1fr 1fr; }
}

/* ── 768 px ─────────────────────────────────── */
@media (max-width: 768px) {
  :root { --gutter: 1.25rem; }

  /* Nav — mobile dropdown */
  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    align-items: flex-start;
    padding: 1.5rem var(--gutter);
    gap: 0.25rem;
    border-bottom: 1px solid var(--color-gray-200);
    box-shadow: var(--shadow);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
    z-index: 99;
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }
  .nav-cta { margin-left: 0; }
  .hamburger { display: flex; }

  /* Hero */
  .hero-content {
    padding-top: 8rem;
    padding-bottom: 4rem;
  }
  .hero-stats { flex-wrap: wrap; gap: 1.5rem; }
  .stat-divider { display: none; }
  .stat { padding: 0; }
  .hero-scroll-indicator { display: none; }

  /* Section spacing */
  .section-header { margin-bottom: 2.5rem; }
  .mission        { padding: 3rem 0; }
  .research,
  .tools-section,
  .team,
  .news,
  .contact        { padding: 4.5rem 0; }
  .publications   { padding: 4.5rem 0; }

  /* Grids */
  .research-grid { grid-template-columns: 1fr; }
  .team-grid     { grid-template-columns: 1fr; }

  /* About stats — 2 columns on mobile instead of 4 */
  .about-stats { grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }

  /* Footer */
  .footer-grid   { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

/* ── 480 px ─────────────────────────────────── */
@media (max-width: 480px) {
  :root { --gutter: 1rem; }

  .publication-item { padding: 1.25rem; }

  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }

  /* Research card body tighter on small phones */
  .research-card-body { padding: 1.25rem; }

  /* News card body tighter */
  .news-card-body { padding: 1.25rem; }

  /* About stats — stay 2 columns but tighter */
  .about-stats { padding: 1rem; }
  .stat-number { font-size: 1.25rem; }

  /* Contact info items */
  .contact-links { flex-direction: column; }
  .contact-links .btn { width: 100%; justify-content: center; }
}