:root { color-scheme: light dark; --accent: #1f5fbf; --border: #c4cad3; }
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; background: #f4f6f9; color: #1c2430; }
main { max-width: 26rem; margin: 3rem auto; padding: 2rem; background: #fff; border-radius: 8px; box-shadow: 0 1px 4px rgb(0 0 0 / 12%); }
.brand { margin: 0 0 1.5rem; font-weight: 700; font-size: 1.25rem; color: var(--accent); }
h1 { margin: 0 0 .75rem; font-size: 1.5rem; line-height: 1.25; }
h2 { margin: 2rem 0 .5rem; font-size: 1rem; }
label { display: block; margin: 1rem 0 .25rem; font-weight: 600; }
input[type="email"], input[type="text"] { width: 100%; padding: .6rem .7rem; font: inherit; border: 1px solid var(--border); border-radius: 6px; background: #fff; color: inherit; }
button, .button { display: block; width: 100%; margin-top: 1rem; padding: .65rem 1rem; font: inherit; font-weight: 600; text-align: center; text-decoration: none; color: #fff; background: var(--accent); border: 1px solid var(--accent); border-radius: 6px; cursor: pointer; }
.button.secondary { margin-top: .5rem; color: var(--accent); background: #fff; }
ul.options { margin: 0; padding: 0; list-style: none; }
.error { padding: .6rem .8rem; color: #8a1c1c; background: #fdecec; border-radius: 6px; }
.muted { margin-top: 1.5rem; font-size: .9rem; }
a { color: var(--accent); }
:focus-visible { outline: 3px solid #f5a623; outline-offset: 2px; }
@media (prefers-color-scheme: dark) {
  body { background: #11161d; color: #e6e9ee; }
  main { background: #1a212b; box-shadow: none; }
  input[type="email"], input[type="text"] { background: #11161d; border-color: #3a4452; }
  .button.secondary { color: #8ab4f8; background: #1a212b; }
  .error { color: #ffb4b4; background: #3a1a1a; }
  a { color: #8ab4f8; }
  .brand { color: #8ab4f8; }
}