:root { --navy: #0b2a6b; --gold: #ffcc00; --ink: #1d1d1f; --paper: #fdfcf7; --error: #b00020; }
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.5 Tahoma, Verdana, system-ui, sans-serif; color: var(--ink); background: var(--paper); }
header { background: var(--gold); border-bottom: 3px solid var(--navy); padding: 12px 16px;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; }
header nav a { color: var(--navy); font-weight: bold; }
.notice { color: #0a5c2b; border: 1px solid #0a5c2b; padding: 8px; border-radius: 4px; background: #f1fbf4; }
button.secondary { background: #fff; color: var(--navy); border: 2px solid var(--navy); }
.brand { color: var(--navy); font-weight: bold; font-size: 1.3rem; text-decoration: none; }
main { max-width: 34rem; margin: 0 auto; padding: 16px; }
h1 { color: var(--navy); }
form { display: grid; gap: 6px; }
label { display: grid; gap: 4px; font-weight: bold; margin-top: 8px; }
input { font: inherit; padding: 8px; border: 1px solid #8a8a8a; border-radius: 4px; width: 100%; }
small { color: #555; }
button, .button { display: inline-block; margin-top: 12px; padding: 10px 18px; background: var(--navy); color: #fff;
  border: 0; border-radius: 4px; font: inherit; font-weight: bold; cursor: pointer; text-decoration: none; }
.error { color: var(--error); border: 1px solid var(--error); padding: 8px; border-radius: 4px; background: #fff5f6; }
code { background: #eee; padding: 1px 4px; border-radius: 3px; }