/* --- Global layout --- */
body {
  margin: 0;
  padding: 0;
  min-height: 100vh;

  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;

  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: #f5f7fa;
  color: #1f2937;
}

.wrapper {
  max-width: 50rem;
  padding: 1rem;

  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;

  text-align: center;
}

h1,
h2,
h3 {
  font-weight: 600;
}

h1 {
  font-size: 2.2rem;
  margin: 0.4em 0;
  color: #0f172a;
}
h2 {
  font-size: 1.7rem;
  margin: 0.3em 0;
  color: #1e293b;
}
h3 {
  font-size: 1.3rem;
  margin: 0.3em 0 0 0;
  color: #334155;
}

/* --- Links --- */
a {
  color: #2563eb;
  text-decoration: none;
  font-weight: 500;
}

a:hover {
  text-decoration: underline;
  color: #1d4ed8;
}

/* --- Lists --- */
ul {
  list-style: none;
  padding: 0;
  margin: 0.5em 0;
}