:root {
  --bg: #1a2332;
  --fg: #e8eef5;
  --accent: #3d9a7a;
  --muted: #9aadc0;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", system-ui, sans-serif;
  background:
    radial-gradient(ellipse at 20% 0%, #243447 0%, transparent 50%),
    radial-gradient(ellipse at 80% 100%, #1e3a32 0%, transparent 45%),
    var(--bg);
  color: var(--fg);
}

.page {
  max-width: 36rem;
  margin: 0 auto;
  padding: 4rem 1.5rem;
  text-align: center;
}

h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.lead {
  margin: 0 0 2rem;
  color: var(--muted);
  font-size: 1.125rem;
  line-height: 1.5;
}

button {
  appearance: none;
  border: none;
  border-radius: 0.5rem;
  padding: 0.75rem 1.5rem;
  font: inherit;
  font-weight: 600;
  color: #0f1a14;
  background: var(--accent);
  cursor: pointer;
  transition: transform 0.15s ease, filter 0.15s ease;
}

button:hover {
  filter: brightness(1.1);
}

button:active {
  transform: scale(0.97);
}

.mensagem {
  min-height: 1.5em;
  margin: 1.25rem 0 0;
  color: var(--accent);
  font-weight: 500;
}