*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #f4f6fb;
  --surface: #ffffff;
  --border: #dde1ec;
  --text-primary: #1a1d27;
  --text-secondary: #5b6178;
  --accent: #3f6fd6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1117;
    --surface: #1a1d27;
    --border: #2a2d3a;
    --text-primary: #e8eaf0;
    --text-secondary: #8b8fa8;
    --accent: #5b8dee;
  }
}

html, body {
  height: 100%;
}

body {
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: 2rem 1rem;
  line-height: 1.6;
}

.card {
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2.5rem 2rem;
  max-width: 540px;
  width: 100%;
}

.domain {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 1.5rem;
  letter-spacing: 0.02em;
}

h1 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

footer {
  margin-top: 2rem;
  font-size: 0.78rem;
  color: var(--text-secondary);
  text-align: center;
}

@media (max-width: 480px) {
  body {
    padding: 1rem;
  }

  .card {
    padding: 1.25rem 1rem;
  }

  .domain {
    font-size: 1.2rem;
    margin-bottom: 1rem;
  }

  h1 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
  }

  p {
    font-size: 0.88rem;
  }

  footer {
    margin-top: 1rem;
  }
}