:root {
  --primary-color: #3b82f6;
  --primary-hover: #2563eb;
  --error-color: #ef4444;
  --text-color: #1f2937;
  --text-secondary: #6b7280;
  --background-color: #f9fafb;
  --card-bg: #ffffff;
  --input-bg: #ffffff;
  --border-color: #e5e7eb;
  --hover-bg: rgba(0, 0, 0, 0.05);
  --shadow-color: rgba(0, 0, 0, 0.1);
  --map-land: #e5e7eb;
  --map-border: #d1d5db;
  --marker-inactive: #9ca3af;
}

[data-theme='dark'] {
  --text-color: #f9fafb;
  --text-secondary: #9ca3af;
  --background-color: #111827;
  --card-bg: #1f2937;
  --input-bg: #374151;
  --border-color: #374151;
  --hover-bg: rgba(255, 255, 255, 0.1);
  --shadow-color: rgba(0, 0, 0, 0.3);
  --map-land: #374151;
  --map-border: #4b5563;
  --marker-inactive: #6b7280;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.5;
  transition: background-color 0.3s, color 0.3s;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--card-bg);
}

.app-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.5rem;
  font-weight: 700;
}

.title-icon {
  font-size: 1.75rem;
}

.app-main {
  flex: 1;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.app-description {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.app-footer {
  text-align: center;
  padding: 1rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.app-footer .excellent { color: #22c55e; }
.app-footer .good { color: #eab308; }
.app-footer .poor { color: #ef4444; }

@media (max-width: 768px) {
  .app-header {
    padding: 1rem;
  }

  .app-title {
    font-size: 1.25rem;
  }

  .app-main {
    padding: 1rem;
  }
}