:root {
  --bg: #0f1115;
  --bg-accent: #171a21;
  --text: #e8eaed;
  --muted: #9aa0aa;
  --accent: #7ec8a0;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  padding: 2rem 1rem;
  background:
    radial-gradient(circle at 50% 0%, var(--bg-accent), var(--bg) 60%);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  text-align: center;
}

header {
  max-width: 34rem;
}

h1 {
  margin: 0 0 0.4rem;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 0;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--muted);
}

#canvas-container {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.45);
}

#canvas-container canvas {
  display: block;
  border-radius: 6px;
}

.hint {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}