:root {
  --bg: #f4f8fb;
  --glow: #dff3f8;
  --fg: #0f172a;
  --muted: #475569;
  --accent: #0e7490;
  --on-accent: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --glow: #0f2f3a;
    --fg: #e2e8f0;
    --muted: #94a3b8;
    --accent: #22d3ee;
    --on-accent: #0b1220;
  }
}

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

html {
  height: 100%;
}

body {
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 2rem;
  background: radial-gradient(120% 70% at 50% 0%, var(--glow) 0%, var(--bg) 65%) var(--bg);
  color: var(--fg);
  font: 400 1.125rem/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  text-align: center;
  -webkit-font-smoothing: antialiased;
}

.mark {
  width: 3.5rem;
  height: 3.5rem;
  margin-bottom: 1.5rem;
}

.mark rect {
  fill: var(--accent);
}

.mark path {
  fill: none;
  stroke: var(--on-accent);
  stroke-width: 3;
  stroke-linecap: round;
}

h1 {
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

p {
  margin-top: 0.75rem;
  color: var(--muted);
}