:root {
  --blur-radius: 10px; /* Optimized lower blur for performance */
  --shadow-soft: 0 10px 40px -10px rgba(0,0,0,0.08);
  --shadow-float: 0 8px 30px rgba(0,0,0,0.12);
  --color-primary: #2563EB;
  --color-primary-dark: #3B82F6;
  --color-primary-light: #EFF6FF;
  --color-navy: #1e3a8a;
  --color-navy-light: #172554;
  --color-gold: #C5A059;
  --text-main: #0f172a;
  --text-muted: #475569;
  --bg-main: #f9fafb;
  --bg-dark: #0f1115;
  --transition-ease: cubic-bezier(0.25, 0.1, 0.25, 1); /* Premium smooth easing */
  --animation-duration: 0.4s;
}

* {
  -webkit-tap-highlight-color: transparent;
  box-sizing: border-box;
  touch-action: manipulation; /* Improves touch responsiveness */
}

body {
  overscroll-behavior-y: none;
  -webkit-font-smoothing: antialiased;
  background-color: var(--bg-main);
  color: var(--text-main);
  font-family: 'Kanit', sans-serif;
  transition: background-color var(--animation-duration) var(--transition-ease);
}

.dark body {
  background-color: var(--bg-dark);
  color: white;
}

.native-scroll {
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
}

.hide-scrollbar::-webkit-scrollbar {
  display: none;
}

.hide-scrollbar {
  -ms-overflow-style: none;
  scrollbar-width: none;
}

.glass-panel {
  background: rgba(255, 255, 255, 0.8); /* Fallback for old browsers */
  backdrop-filter: blur(var(--blur-radius));
  -webkit-backdrop-filter: blur(var(--blur-radius));
  isolation: isolate; /* Optimizes stacking */
  transition: background 0.3s var(--transition-ease);
}

.dark .glass-panel {
  background: rgba(15, 23, 42, 0.8); /* Fallback */
}

.pb-safe {
  padding-bottom: env(safe-area-inset-bottom);
}

.map-btn-shadow {
  box-shadow: 0 10px 20px -5px rgba(37, 99, 235, 0.5);
}

.line-clamp-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.img-fade {
  animation: imgFade var(--animation-duration) var(--transition-ease);
  will-change: opacity, transform; /* GPU hint */
}

@keyframes imgFade {
  from { opacity: 0.8; transform: scale(0.98); }
  to { opacity: 1; transform: scale(1); }
}

.fade-in-up {
  animation: fadeInUp var(--animation-duration) var(--transition-ease) forwards;
  will-change: opacity, transform;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Reduced duplication: Composable classes */
.shadow-hover {
  transition: transform var(--animation-duration) var(--transition-ease), box-shadow var(--animation-duration) var(--transition-ease);
}

.shadow-hover:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-float);
}

.active-scale {
  transition: transform 0.1s ease-out;
}

.active-scale:active {
  transform: scale(0.95);
}