:root {
  --bg: #ffffff;
  --bg-secondary: #f5f5f5;
  --text: #1a1a1a;
  --text-secondary: #666666;
  --border: #e0e0e0;
  --shadow: rgba(0, 0, 0, 0.1);
  --shadow-hover: rgba(0, 0, 0, 0.15);
  --accent: #0066cc;
  --accent-hover: #0052a3;
  
  --status-live: #22c55e;
  --status-live-bg: #f0fdf4;
  --status-beta: #f59e0b;
  --status-beta-bg: #fffbeb;
  --status-internal: #6b7280;
  --status-internal-bg: #f9fafb;
  
  --tag-bg: #e5e7eb;
  --tag-text: #374151;
  
  --focus-ring: 2px solid var(--accent);
}

[data-theme="dark"] {
  --bg: #0f172a;
  --bg-secondary: #1e293b;
  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --border: #334155;
  --shadow: rgba(0, 0, 0, 0.3);
  --shadow-hover: rgba(0, 0, 0, 0.5);
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  
  --status-live: #22c55e;
  --status-live-bg: #052e16;
  --status-beta: #f59e0b;
  --status-beta-bg: #451a03;
  --status-internal: #9ca3af;
  --status-internal-bg: #1f2937;
  
  --tag-bg: #334155;
  --tag-text: #cbd5e1;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg);
  transition: background-color 0.2s ease, color 0.2s ease;
}

header {
  text-align: center;
  padding: 3rem 1rem 2rem;
  border-bottom: 1px solid var(--border);
}

h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
  align-items: flex-start;
}

.search-wrapper {
  flex: 1;
  min-width: 200px;
}

#search {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-family: inherit;
  transition: border-color 0.2s ease;
}

#search:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.tag-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  flex: 2;
  min-width: 200px;
}

.tag-chip {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
}

.tag-chip:hover {
  background: var(--bg-secondary);
}

.tag-chip:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--accent);
}

.tag-chip.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.dark-mode-toggle {
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
  font-size: 1.5rem;
  line-height: 1;
  transition: all 0.2s ease;
  font-family: inherit;
}

.dark-mode-toggle:hover {
  background: var(--bg-secondary);
}

.dark-mode-toggle:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--accent);
}

.apps-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .apps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .apps-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.app-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 1px 3px var(--shadow);
  transition: all 0.2s ease;
  cursor: pointer;
  position: relative;
  text-decoration: none;
  color: inherit;
  display: block;
}

.app-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px var(--shadow-hover);
}

.app-card:focus {
  outline: none;
  box-shadow: 0 0 0 3px var(--accent);
}

.app-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.75rem;
  gap: 1rem;
}

.app-name {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  margin: 0;
}

.status-badge {
  padding: 0.25rem 0.75rem;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  white-space: nowrap;
}

.status-badge.online {
  background: var(--status-live-bg);
  color: var(--status-live);
}

.status-badge.offline {
  background: #fef2f2;
  color: #dc2626;
}

[data-theme="dark"] .status-badge.offline {
  background: #450a0a;
  color: #f87171;
}

.status-badge.checking {
  background: var(--status-beta-bg);
  color: var(--status-beta);
}

.status-badge.internal {
  background: var(--status-internal-bg);
  color: var(--status-internal);
}

.app-description {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 0.9375rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.5;
}

.app-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.app-tag {
  padding: 0.25rem 0.625rem;
  background: var(--tag-bg);
  color: var(--tag-text);
  border-radius: 12px;
  font-size: 0.75rem;
}

.empty-state {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--text-secondary);
}

.empty-state p {
  font-size: 1.125rem;
}

footer {
  text-align: center;
  padding: 2rem 1rem;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

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

footer a:hover {
  text-decoration: underline;
}

footer a:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--accent);
  border-radius: 2px;
}