:root {
  /* Core Palette */
  --primary-color: #3b82f6;
  --primary-hover: #2563eb;
  --accent-glow: rgba(59, 130, 246, 0.4);

  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;

  /* Text */
  --text-color: #1f2937;
  --text-secondary: #6b7280;

  /* Backgrounds */
  --background-color: #f3f4f6;
  --card-bg: rgba(255, 255, 255, 0.85);
  --input-bg: #ffffff;
  --border-color: #e5e7eb;
  --hover-bg: rgba(0, 0, 0, 0.05);

  /* Effects */
  --glass-blur: blur(12px);
  --shadow-color: rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 0 transparent;
  --transition-fast: 0.2s ease;
  --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  /* Map */
  --map-land: #d1d5db;
  --map-border: #9ca3af;
  --marker-inactive: #9ca3af;
}

[data-theme='dark'] {
  --primary-color: #38bdf8;
  --primary-hover: #0ea5e9;
  --accent-glow: rgba(56, 189, 248, 0.35);

  --text-color: #e2e8f0;
  --text-secondary: #94a3b8;

  --background-color: #0f172a;
  --card-bg: rgba(30, 41, 59, 0.75);
  --input-bg: rgba(15, 23, 42, 0.9);
  --border-color: rgba(148, 163, 184, 0.2);
  --hover-bg: rgba(255, 255, 255, 0.1);

  --shadow-color: rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px rgba(56, 189, 248, 0.12);

  --map-land: #1e293b;
  --map-border: #334155;
  --marker-inactive: #475569;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--background-color);
  background-image:
    radial-gradient(circle at 50% 0%, rgba(56, 189, 248, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 85% 85%, rgba(139, 92, 246, 0.05) 0%, transparent 40%);
  background-attachment: fixed;
  color: var(--text-color);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
  -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: 1.25rem 2rem;
  background: var(--card-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.07);
}

.app-title {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  background: linear-gradient(135deg, var(--text-color) 0%, var(--primary-color) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.title-icon {
  font-size: 1.75rem;
  -webkit-text-fill-color: initial;
  filter: drop-shadow(0 0 8px var(--accent-glow));
}

.app-main {
  flex: 1;
  padding: 3rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.app-description {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  font-size: 1.1rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.app-footer {
  text-align: center;
  padding: 1.5rem;
  border-top: 1px solid var(--border-color);
  background: var(--card-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.app-footer .excellent { color: var(--success-color); text-shadow: 0 0 6px var(--success-color); }
.app-footer .good { color: var(--warning-color); text-shadow: 0 0 6px var(--warning-color); }
.app-footer .poor { color: var(--error-color); text-shadow: 0 0 6px var(--error-color); }

@media (max-width: 768px) {
  .app-header { padding: 1rem; }
  .app-title { font-size: 1.25rem; }
  .app-main { padding: 1.5rem 1rem; }
}