/* ========================================
   QEFIR Lab - Main Styles
   Theme: Organic/Natural with Scientific Rigor
   ======================================== */

/* Import fonts - Libre Baskerville for scientific elegance, Source Sans for readability */
@import url('https://fonts.googleapis.com/css2?family=Libre+Baskerville:ital,wght@0,400;0,700;1,400&family=Source+Sans+3:wght@300;400;600;700&display=swap');

/* CSS Variables */
:root {
  /* Forest palette */
  --forest-deep: #1a3c34;
  --forest-mid: #2d5a4e;
  --bark-brown: #5c4033;
  --bark-light: #8b6914;
  --lichen: #8fa876;
  --lichen-light: #b8c9a3;
  --canopy-light: #e8edd8;
  --understory: #f5f7f0;
  --morning-mist: #fafbf8;
  
  /* Accent colors - insect-inspired */
  --beetle-emerald: #2e7d5a;
  --moth-amber: #c9a227;
  --wing-copper: #b87333;
  
  /* Typography */
  --font-display: 'Libre Baskerville', Georgia, serif;
  --font-body: 'Source Sans 3', 'Segoe UI', sans-serif;
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-xxl: 6rem;
  
  /* Transitions */
  --transition-smooth: 0.3s ease;
}

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

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

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--forest-deep);
  background-color: var(--morning-mist);
  -webkit-font-smoothing: antialiased;
}

/* Subtle texture overlay */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%' height='100%' filter='url(%23noise)'/%3E%3C/svg%3E");
  z-index: 1000;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.3;
  color: var(--forest-deep);
  margin-top: 0;
}

h1 {
  font-size: 2.5rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.875rem;
  margin-bottom: var(--space-md);
  position: relative;
}

h3 {
  font-size: 1.375rem;
  color: var(--forest-mid);
}

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

a {
  color: var(--beetle-emerald);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: var(--transition-smooth);
}

a:hover {
  color: var(--forest-deep);
  border-bottom-color: var(--lichen);
}

/* ========================================
   Header & Navigation
   ======================================== */
.site-header {
  background: linear-gradient(180deg, var(--forest-deep) 0%, var(--forest-mid) 100%);
  padding: var(--space-md) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 20px rgba(26, 60, 52, 0.15);
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-title {
  font-family: var(--font-display);
  font-size: 1.375rem;
  color: var(--canopy-light);
  margin: 0;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.site-title a {
  color: inherit;
  border: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.site-title a:hover {
  color: var(--lichen-light);
}

.site-title-logo {
  height: 32px;
  width: auto;
  background-color: #e67e22;
  padding: 4px;
  border-radius: 4px;
}

.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: var(--space-lg);
}

.main-nav a {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--lichen-light);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: var(--space-sm) 0;
  border-bottom: 2px solid transparent;
  transition: var(--transition-smooth);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--canopy-light);
  border-bottom-color: var(--moth-amber);
}

/* ========================================
   Hero Section (Home page)
   ======================================== */
.hero {
  background: linear-gradient(135deg, var(--forest-deep) 0%, var(--forest-mid) 50%, var(--bark-brown) 100%);
  color: var(--canopy-light);
  padding: var(--space-xxl) var(--space-lg);
  position: relative;
  overflow: hidden;
}

/* Forest canopy pattern overlay */
.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  opacity: 0.1;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M30 5 L35 20 L50 20 L38 30 L43 45 L30 35 L17 45 L22 30 L10 20 L25 20 Z' fill='%23ffffff' fill-opacity='0.3'/%3E%3C/svg%3E");
  background-size: 80px 80px;
}

.hero-content {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: 3rem;
  color: var(--canopy-light);
  margin-bottom: var(--space-md);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-logo {
  display: block;
  width: 150px;
  height: auto;
  object-fit: contain;
  margin: 0 auto var(--space-lg) auto;
  border-radius: 8px;
  background-color: #e67e22;
  padding: 8px;
}

.hero .tagline {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.375rem;
  color: var(--lichen-light);
  margin-bottom: var(--space-lg);
  opacity: 0.95;
}

.hero-description {
  font-size: 1.125rem;
  max-width: 700px;
  line-height: 1.8;
}

/* ========================================
   Main Content Area
   ======================================== */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

.page-header {
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 3px solid var(--lichen);
}

.page-header h1 {
  margin-bottom: var(--space-sm);
}

.page-header .subtitle {
  font-size: 1.125rem;
  color: var(--forest-mid);
}

/* Section styling */
.section {
  margin-bottom: var(--space-xxl);
}

.section-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.section-header h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--lichen) 0%, var(--moth-amber) 100%);
  margin-top: var(--space-sm);
}

/* ========================================
   Cards - Projects, Publications, Team
   ======================================== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
}

.card {
  background: white;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(26, 60, 52, 0.08);
  transition: var(--transition-smooth);
  border: 1px solid var(--lichen-light);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(26, 60, 52, 0.12);
}

.card-image {
  height: 180px;
  background: linear-gradient(135deg, var(--forest-mid) 0%, var(--lichen) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  overflow: hidden;
}

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

.card-content {
  padding: var(--space-lg);
}

.card-content h3 {
  margin-bottom: var(--space-sm);
}

.card-content h3 a {
  color: var(--forest-deep);
  border: none;
}

.card-content h3 a:hover {
  color: var(--beetle-emerald);
}

.card-meta {
  font-size: 0.875rem;
  color: var(--bark-brown);
  margin-bottom: var(--space-sm);
}

.card-description {
  color: var(--forest-mid);
  font-size: 0.95rem;
}

/* Tags */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-md);
}

.tag {
  background: var(--canopy-light);
  color: var(--forest-mid);
  font-size: 0.75rem;
  font-weight: 600;
  padding: var(--space-xs) var(--space-sm);
  border-radius: 3px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.publication-item {
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  background: white;
  border-left: 4px solid var(--lichen);
  box-shadow: 0 2px 10px rgba(26, 60, 52, 0.05);
  transition: var(--transition-smooth);
}

.publication-item:hover {
  border-left-color: var(--moth-amber);
  box-shadow: 0 4px 20px rgba(26, 60, 52, 0.1);
}

.publication-year {
  font-family: var(--font-display);
  font-size: 0.875rem;
  color: var(--bark-brown);
  font-weight: 700;
}

.publication-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  margin: var(--space-sm) 0;
}

.publication-authors {
  font-size: 0.95rem;
  color: var(--forest-mid);
}

.publication-journal {
  font-style: italic;
  color: var(--bark-brown);
}

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

.publication-links a {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--beetle-emerald);
}

/* ========================================
   Team Members
   ======================================== */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.team-card {
  background: white;
  padding: var(--space-lg);
  border-radius: 4px;
  text-align: center;
  box-shadow: 0 4px 20px rgba(26, 60, 52, 0.08);
  border-top: 4px solid var(--lichen);
}

.team-photo {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--forest-mid) 0%, var(--lichen) 100%);
  margin: 0 auto var(--space-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--canopy-light);
}

.team-card h3 {
  margin-bottom: var(--space-xs);
}

.team-role {
  color: var(--bark-brown);
  font-size: 0.95rem;
  margin-bottom: var(--space-sm);
}

.team-research {
  font-size: 0.875rem;
  color: var(--forest-mid);
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
  background: var(--forest-deep);
  color: var(--lichen-light);
  padding: var(--space-xl) var(--space-lg);
  margin-top: var(--space-xxl);
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-xl);
}

.footer-about h3 {
  color: var(--canopy-light);
  margin-bottom: var(--space-md);
}

.footer-links h4,
.footer-contact h4 {
  color: var(--canopy-light);
  font-family: var(--font-body);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-md);
}

.footer-links ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links a {
  color: var(--lichen-light);
  font-size: 0.95rem;
  display: block;
  padding: var(--space-xs) 0;
}

.footer-links a:hover {
  color: var(--canopy-light);
}

.footer-bottom {
  max-width: 1200px;
  margin: var(--space-lg) auto 0;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--forest-mid);
  font-size: 0.875rem;
  opacity: 0.8;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 900px) {
  .header-content {
    flex-direction: column;
    gap: var(--space-md);
  }
  
  .main-nav ul {
    gap: var(--space-md);
  }
  
  .hero h1 {
    font-size: 2.25rem;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

@media (max-width: 600px) {
  .main-nav ul {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .hero {
    padding: var(--space-xl) var(--space-md);
  }
  
  .hero h1 {
    font-size: 1.875rem;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
  }
}