:root {
  --bg: #f4f6f9; --card: #ffffff; --text: #1d2433; --muted: #5d6779; --line: #dde2ea;
  --primary: #1f5eff; --primary-hover: #194fd6; --primary-text: #ffffff;
  --alert: #fff7e6; --alert-line: #f1c97a; --error: #fdecec; --error-line: #e8a1a1; --focus: #1f5eff;
  --code: #eef1f6;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #11151c; --card: #1a2029; --text: #e7ebf1; --muted: #9aa4b5; --line: #2c3442;
    --primary: #4d7dff; --primary-hover: #6a92ff; --alert: #2b2415; --alert-line: #6b5520;
    --error: #2e1a1a; --error-line: #7a3434; --code: #242b37;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg); color: var(--text);
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
.top {
  display: flex; align-items: center; gap: 10px; padding: 14px 20px; border-bottom: 1px solid var(--line);
  background: var(--card);
}
.brand { font-weight: 700; letter-spacing: .2px; }
.brand-sub { color: var(--muted); font-size: 14px; }
.signout { margin-left: auto; }
.wrap { max-width: 560px; margin: 40px auto; padding: 0 16px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 28px;
  box-shadow: 0 1px 2px rgba(16, 24, 40, .04);
}
h1 { font-size: 24px; line-height: 1.25; margin: 0 0 12px; }
p { margin: 0 0 14px; }
.lead { font-size: 17px; }
.muted, .help, .hint { color: var(--muted); }
.help { font-size: 14px; margin: 0 0 6px; }
.hint { font-size: 14px; margin-top: 16px; }
.who { margin-bottom: 18px; }
.who .muted { display: inline-block; margin-left: 4px; }
code { background: var(--code); padding: 1px 6px; border-radius: 4px; font-size: 14px; }
.facts { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; margin: 0 0 18px; }
.facts dt { color: var(--muted); }
.facts dd { margin: 0; overflow-wrap: anywhere; }
.pre { white-space: pre-wrap; }
.alert {
  background: var(--alert); border: 1px solid var(--alert-line); border-radius: 8px; padding: 10px 12px;
  margin: 0 0 16px; font-size: 15px;
}
.alert.error { background: var(--error); border-color: var(--error-line); }
.form label, legend { font-weight: 600; display: block; margin: 0 0 6px; }
.form label.sub { margin-top: 12px; font-weight: 600; }
fieldset { border: 0; padding: 0; margin: 18px 0 0; }
textarea, input[type=text], input:not([type]) {
  width: 100%; font: inherit; color: var(--text); background: var(--card);
  border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px;
}
textarea { resize: vertical; min-height: 110px; }
.choices { display: flex; gap: 10px; flex-wrap: wrap; }
.choice, .check {
  display: flex; align-items: center; gap: 8px; font-weight: 400 !important; margin: 0 !important;
  border: 1px solid var(--line); border-radius: 8px; padding: 10px 14px; cursor: pointer; min-height: 44px;
}
.form .choice, .form .check { display: flex; }
.checks { display: grid; gap: 8px; }
input[type=radio], input[type=checkbox] { width: 18px; height: 18px; accent-color: var(--primary); }
.button {
  display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 10px 20px;
  border-radius: 8px; border: 1px solid transparent; font: inherit; font-weight: 600; text-decoration: none;
  cursor: pointer; margin-top: 8px;
}
.form .button { margin-top: 22px; }
.primary { background: var(--primary); color: var(--primary-text); }
.primary:hover { background: var(--primary-hover); }
.secondary { background: transparent; color: var(--text); border-color: var(--line); }
.secondary:hover { background: var(--code); }
.link { background: none; border: 0; color: var(--primary); font: inherit; cursor: pointer; padding: 8px; }
a { color: var(--primary); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.foot { color: var(--muted); font-size: 14px; text-align: center; margin-top: 18px; }
@media (max-width: 480px) {
  .wrap { margin: 16px auto; }
  .card { padding: 20px; }
  h1 { font-size: 21px; }
  .button { width: 100%; }
  .facts { grid-template-columns: 1fr; gap: 2px; }
  .facts dd { margin-bottom: 8px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }