:root {
  --bg: #fff;
  --text: #0F1115;
  --muted: #5F6672;
  --line: #E1E4EA;
  --accent: #1B4DE4;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Onest, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
}
.wrap { max-width: 920px; margin: 0 auto; padding: 1.25rem; }
.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.5rem; }
.logo {
  font-family: Unbounded, sans-serif;
  font-size: 20px;
  color: var(--accent);
  text-decoration: none;
}
nav { display: flex; flex-wrap: wrap; gap: 0.75rem 1rem; }
nav a { color: var(--text); text-decoration: none; font-size: 14px; }
nav a:hover { color: var(--accent); }
h1 {
  font-family: Unbounded, sans-serif;
  font-size: clamp(22px, 4vw, 28px);
  color: var(--accent);
  line-height: 1.25;
}
h2 { font-size: 18px; margin-top: 2rem; }
.muted { color: var(--muted); }
.lead { font-size: 17px; }
.btn {
  display: inline-block;
  border: 1px solid var(--line);
  background: #fff;
  padding: 0.55rem 0.9rem;
  cursor: pointer;
  font: inherit;
  text-decoration: none;
  color: var(--text);
}
.btn:disabled, .btn.disabled {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}
.btn.primary, .btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn, .btn-primary {
  min-height: 48px;
  padding: 0.75rem 1.1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.link-secondary { color: var(--muted); text-decoration: underline; font-size: 15px; }
.screen { max-width: 560px; margin: 0 auto; }
.adv-list { padding-left: 1.2rem; }
.adv-extra { margin-top: 2rem; border-top: 1px solid var(--line); padding-top: 1rem; }
.adv-extra summary { cursor: pointer; margin-bottom: 0.75rem; }
.explain { max-width: 40rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 1rem 0; }
.card { border-top: 1px solid var(--line); padding: 1rem 0; margin: 1rem 0; }
.note-box { background: #F5F7FB; padding: 0.85rem 1rem; margin: 1rem 0; font-size: 14px; }
table.data { width: 100%; border-collapse: collapse; font-size: 14px; }
table.data th, table.data td { border: 1px solid var(--line); padding: 0.45rem 0.6rem; text-align: left; }
table.data th { background: #F5F7FB; }
.verify-result { font-size: 22px; font-family: Unbounded, sans-serif; margin: 1rem 0; }
.verify-sub { font-size: 16px; color: var(--muted); }
.protocol-body h2, .protocol-body h3 { scroll-margin-top: 1rem; }
.protocol-toc { background: #F5F7FB; padding: 1rem; margin: 1rem 0; font-size: 14px; }
.protocol-toc ul { margin: 0; padding-left: 1.2rem; }
label.chk { display: flex; gap: 0.55rem; align-items: flex-start; margin: 0.5rem 0; }
label.chk input { width: auto; margin-top: 0.25rem; }
input, select, textarea { width: 100%; max-width: 480px; padding: 0.45rem; font: inherit; border: 1px solid var(--line); }
.site-footer { border-top: 1px solid var(--line); margin-top: 3rem; font-size: 13px; }
.flash { background: #F5F7FB; padding: 0.75rem 1rem; margin: 1rem 0; }
.mono { font-family: "JetBrains Mono", monospace; font-size: 13px; word-break: break-all; }