:root {
  font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;
  line-height: 1.5;
  font-weight: 400;

  color-scheme: dark;
  color: rgba(255, 255, 255, 0.87);
  background-color: #000000;

  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  font-weight: 500;
  color: #646cff;
  text-decoration: inherit;
}
a:hover {
  color: #535bf2;
}

/* Set CSS custom property for real viewport height */
:root {
  --vh: 1vh;
}

body {
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-width: 320px;
  min-height: 100vh; /* Fallback for old browsers */
  min-height: 100dvh; /* Modern browsers with dvh support */
  min-height: calc(var(--vh, 1vh) * 100); /* JS-calculated fallback for best compatibility */
  background-color: #000000;
  overflow: hidden; /* Prevent scrolling on mobile */
}

h1 {
  font-size: 3.2em;
  line-height: 1.1;
}

button {
  border-radius: 8px;
  border: 1px solid transparent;
  padding: 0.6em 1.2em;
  font-size: 1em;
  font-weight: 500;
  font-family: inherit;
  background-color: #1a1a1a;
  cursor: pointer;
  transition: border-color 0.25s;
}
button:hover {
  border-color: #646cff;
}
button:focus,
button:focus-visible {
  outline: 4px auto -webkit-focus-ring-color;
}

/* Mobile touch optimizations */
* {
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

input, textarea {
  -webkit-user-select: text;
  -moz-user-select: text;
  -ms-user-select: text;
  user-select: text;
}

button {
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
  pointer-events: auto;
}

canvas {
  touch-action: none;
}