:root {
  --ink: #14181f;
  --muted: #5b6572;
  --line: #dfe3e8;
  --accent: #1f4b8f;
  --error: #a3231f;
  --bg: #ffffff;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
}
.site-header {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 1rem 1.25rem; border-bottom: 1px solid var(--line);
}
.brand { font-weight: 650; text-decoration: none; color: var(--ink); }
.site-header nav { display: flex; align-items: center; gap: 1rem; }
.who { color: var(--muted); font-size: .9rem; }
.inline { display: inline; margin: 0; }
main { max-width: 62rem; margin: 0 auto; padding: 2rem 1.25rem; }
.narrow { max-width: 24rem; }
h1 { font-size: 1.5rem; margin-top: 0; }
.hero h1 { font-size: 2rem; max-width: 22ch; }
form { display: grid; gap: .35rem; margin-top: 1.25rem; }
label { font-size: .85rem; color: var(--muted); }
input[type="email"], input[type="password"], input[type="text"], input:not([type]) {
  padding: .6rem .7rem; border: 1px solid var(--line); border-radius: 6px;
  font-size: 1rem; width: 100%;
}
button, .button {
  margin-top: .75rem; padding: .6rem 1rem; border: 0; border-radius: 6px;
  background: var(--accent); color: #fff; font-size: 1rem; cursor: pointer;
  text-decoration: none; display: inline-block;
}
button.link {
  margin: 0; padding: 0; background: none; color: var(--accent);
  font-size: .9rem; text-decoration: underline;
}
.error {
  padding: .6rem .75rem; border-left: 3px solid var(--error);
  background: #fdf3f2; color: var(--error);
}
.facts { display: grid; grid-template-columns: max-content 1fr; gap: .35rem 1rem; }
.facts dt { color: var(--muted); }
.facts dd { margin: 0; }
@media (max-width: 420px) { main { padding: 1.25rem 1rem; } }