src/app.css

:root {
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  font-weight: 400;

  color-scheme: light;
  color: #213547;
  background-color: #f5f5f5;

  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  
  /* Mobile-specific variables */
  --safe-area-inset-top: env(safe-area-inset-top, 0);
  --safe-area-inset-bottom: env(safe-area-inset-bottom, 0);
  --safe-area-inset-left: env(safe-area-inset-left, 0);
  --safe-area-inset-right: env(safe-area-inset-right, 0);
  --tab-bar-height: 60px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  display: flex;
  min-width: 320px;
  min-height: 100vh;
  overscroll-behavior: none;
  -webkit-overflow-scrolling: touch;
  touch-action: pan-y;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

#app {
  width: 100%;
  height: 100vh;
  height: 100dvh;
  position: relative;
}

a {
  font-weight: 500;
  color: #007bff;
  text-decoration: inherit;
}

a:hover {
  text-decoration: underline;
}

button {
  font-family: inherit;
  font-size: inherit;
  -webkit-appearance: none;
  appearance: none;
  touch-action: manipulation;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
}

/* Utility classes */
.text-center {
  text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.p-1 { padding: 0.5rem; }
.p-2 { padding: 1rem; }
.p-3 { padding: 1.5rem; }
.p-4 { padding: 2rem; }

/* Flex utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-1 { flex: 1; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }

/* Mobile-first responsive styles */
@media (max-width: 768px) {
  .hide-mobile {
    display: none !important;
  }
}

@media (min-width: 769px) {
  .hide-desktop {
    display: none !important;
  }
}

/* Prevent text selection on UI elements */
.no-select {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

/* iOS-style tap highlight */
.tappable {
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0.1);
  cursor: pointer;
}

/* Smooth transitions for interactive elements */
.interactive {
  transition: transform 0.1s ease-out, opacity 0.1s ease-out;
}

.interactive:active {
  transform: scale(0.95);
  opacity: 0.8;
}

/* Hide scrollbar for Chrome, Safari and Opera */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
  background: #888;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #555;
}

/* Mobile scrollbar styles */
@media (max-width: 768px) {
  ::-webkit-scrollbar {
    width: 4px;
  }
}