:root {
  --sky-top: #74c7ff;
  --sky-bottom: #d9f4ff;
  --panel: #0f2233;
  --text: #e8f3fb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #2f4f66 0%, #09131d 100%);
  color: var(--text);
}

.container {
  width: min(95vw, 520px);
  text-align: center;
}

h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.4rem, 4vw, 2rem);
}

.hint {
  margin: 0 0 0.8rem;
  opacity: 0.9;
}

canvas {
  width: 100%;
  height: auto;
  border: 3px solid #d9e7f2;
  border-radius: 14px;
  display: block;
  background: linear-gradient(180deg, var(--sky-top), var(--sky-bottom));
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}