:root {
  --primary: #1f6f3d;
  --primary-light: #4a9960;
  --background: #fafafa;
  --surface: #ffffff;
  --text-primary: #1a1a1a;
  --text-secondary: #666666;
  --border: #dddddd;
  --status-pending: #f59e0b;
  --status-verified: #10b981;
  --status-declined: #ef4444;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 24px;
  --spacing-2xl: 32px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 12px;
}

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

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--background);
}

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

a:hover {
  text-decoration: underline;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: var(--spacing-md) var(--spacing-xl);
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 700;
  font-size: 18px;
  color: var(--primary);
}

.nav-brand img {
  width: 32px;
  height: 32px;
  border-radius: 6px;
}

.nav-brand img.nav-icon {
  object-fit: contain;
}

.nav-brand img.nav-icon[src=""] {
  display: none;
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-link {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-weight: 500;
  transition: all 0.2s;
}

.nav-link:hover {
  background: var(--background);
  color: var(--primary);
  text-decoration: none;
}

.nav-link.active {
  background: var(--primary);
  color: white;
}

.nav-link-apps {
  border: 1px solid var(--primary);
  color: var(--primary);
}

.nav-link-apps:hover {
  background: var(--primary);
  color: white;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl);
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: var(--spacing-xl);
  color: var(--text-primary);
}

.section-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
}

.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: white;
  padding: var(--spacing-2xl);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.hero h1 {
  font-size: 32px;
  margin-bottom: var(--spacing-md);
}

.hero p {
  font-size: 18px;
  opacity: 0.9;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
}

.stat-value {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
}

.stat-label {
  font-size: 14px;
  color: var(--text-secondary);
}

.tree-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.tree-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
}

.tree-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.tree-card-image {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-md);
  background: var(--background);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
}

.tree-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-sm);
}

.tree-card-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.tree-species {
  font-weight: 700;
  font-size: 16px;
}

.tree-scientific {
  font-size: 13px;
  color: var(--text-secondary);
  font-style: italic;
}

.tree-location {
  font-size: 13px;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.tree-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--spacing-sm);
}

.tree-circumference {
  font-size: 14px;
  color: var(--primary);
  font-weight: 600;
}

.status-badge {
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
}

.status-verified {
  background: var(--status-verified);
  color: white;
}

.status-pending {
  background: var(--status-pending);
  color: white;
}

.status-rejected {
  background: var(--status-declined);
  color: white;
}

#map-container {
  height: calc(100vh - 60px);
  width: 100%;
}

#map {
  height: 100%;
  width: 100%;
}

.map-popup {
  min-width: 200px;
}

.map-popup h3 {
  font-size: 16px;
  margin-bottom: var(--spacing-xs);
}

.map-popup p {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.map-popup a {
  display: inline-block;
  margin-top: var(--spacing-sm);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--primary);
  color: white;
  border-radius: var(--radius-sm);
  font-size: 13px;
}

.map-popup a:hover {
  background: var(--primary-light);
  text-decoration: none;
}

.tree-detail {
  max-width: 800px;
  margin: 0 auto;
}

.tree-detail-header {
  display: flex;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.tree-detail-photos {
  flex: 1;
  min-height: 300px;
  background: var(--background);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.tree-detail-photos img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.tree-detail-info {
  flex: 1;
}

.tree-detail-species {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
}

.tree-detail-scientific {
  font-size: 18px;
  color: var(--text-secondary);
  font-style: italic;
  margin-bottom: var(--spacing-lg);
}

.detail-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.detail-row {
  display: flex;
  justify-content: space-between;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--border);
}

.detail-row:last-child {
  border-bottom: none;
}

.detail-label {
  color: var(--text-secondary);
}

.detail-value {
  font-weight: 600;
}

.sketchfab-embed {
  width: 100%;
  height: 400px;
  border: none;
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
}

.photo-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.photo-gallery img {
  width: 100%;
  height: 150px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform 0.2s;
}

.photo-gallery img:hover {
  transform: scale(1.05);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}

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

.btn-primary:hover {
  background: var(--primary-light);
}

.btn-secondary {
  background: var(--surface);
  color: var(--primary);
  border: 1px solid var(--primary);
}

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

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
  color: var(--text-secondary);
}

.empty-state {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--text-secondary);
}

.filter-bar {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
}

.filter-input {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  min-width: 200px;
}

.filter-input:focus {
  outline: 2px solid var(--primary);
  border-color: var(--primary);
}

.why-content {
  max-width: 700px;
  margin: 0 auto;
}

.why-section {
  margin-bottom: var(--spacing-2xl);
}

.why-section h2 {
  font-size: 22px;
  margin-bottom: var(--spacing-lg);
  color: var(--primary);
}

.why-section p {
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
}

.criteria-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.criteria-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  background: var(--surface);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.criteria-number {
  width: 32px;
  height: 32px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}

.criteria-content h3 {
  font-size: 16px;
  margin-bottom: var(--spacing-xs);
}

.criteria-content p {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0;
}

@media (max-width: 768px) {
  .nav {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .nav-links {
    gap: var(--spacing-sm);
  }
  
  .nav-link {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 14px;
  }
  
  .container {
    padding: var(--spacing-lg);
  }
  
  .hero h1 {
    font-size: 24px;
  }
  
  .tree-detail-header {
    flex-direction: column;
  }
  
  .tree-grid {
    grid-template-columns: 1fr;
  }
}