:root {
  --ink: #16181d;
  --muted: #5b6069;
  --line: #dfe2e7;
  --bg: #ffffff;
  --panel: #f6f7f9;
  --accent: #1a4fa0;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}
.wrap { max-width: 640px; margin: 0 auto; padding: 0 20px; }
header { padding-top: 32px; }
h1 { font-size: 26px; font-weight: 600; margin: 0 0 12px; }
h2 { font-size: 20px; font-weight: 600; margin: 0 0 8px; }
h2 span { color: var(--muted); font-weight: 500; }
.lede { margin: 0 0 4px; }
.note { color: var(--muted); font-size: 14px; margin: 16px 0 0; }
.purpose { margin: 0 0 16px; color: var(--muted); }
.card, .block {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 20px;
  margin: 24px 0;
}
dl { display: grid; grid-template-columns: 110px 1fr; gap: 6px 12px; margin: 0 0 20px; font-size: 14px; }
dt { color: var(--muted); }
dd { margin: 0; }
.hash { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; word-break: break-all; }
.btn {
  display: block;
  text-align: center;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 16px 20px;
  border-radius: 8px;
  min-height: 56px;
}
.btn span { font-weight: 400; opacity: 0.85; }
ol { margin: 0; padding-left: 20px; }
li { margin-bottom: 10px; }
li span { color: var(--muted); }
.slot {
  border: 1px dashed var(--line);
  background: var(--panel);
  border-radius: 8px;
  padding: 40px 20px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}
.slot p { margin: 0; }
footer { padding: 8px 20px 40px; color: var(--muted); font-size: 14px; }
@media (prefers-color-scheme: dark) {
  :root { --ink: #e8eaee; --muted: #9aa1ac; --line: #2c3038; --bg: #101216; --panel: #181b21; --accent: #3f78d8; }
}