:root {
  --bg-light: #ffffff;
  --bg-dark: #000000;
  --text-light: #1d1d1f;
  --text-dark: #f5f5f7;
  --sub-light: #6e6e73;
  --sub-dark: #a1a1a6;
}

@media (prefers-color-scheme: light) {
  body {
    background: var(--bg-light);
    color: var(--text-light);
  }
  .sub { color: var(--sub-light); }
}

@media (prefers-color-scheme: dark) {
  body {
    background: var(--bg-dark);
    color: var(--text-dark);
  }
  .sub { color: var(--sub-dark); }
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display",
               "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

main {
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
}

.icon {
  font-size: 28px;
  margin-bottom: 24px;
  opacity: 0.9;
}

h1 {
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin: 0;
}

.sub {
  font-size: 19px;
  margin-top: 16px;
  max-width: 500px;
}

footer {
  position: absolute;
  bottom: 24px;
  font-size: 13px;
  opacity: 0.4;
}