:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --text: #1b1f24;
  --muted: #5f6b7a;
  --border: #dde1e6;
  --accent: #2f6fed;
  --accent-text: #ffffff;
  --note: #eef3fe;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --panel: #1a1d23;
    --text: #e8eaed;
    --muted: #9aa4b2;
    --border: #2c313a;
    --accent: #4d86f7;
    --note: #1b2436;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}
a { color: var(--accent); }
code { font-size: 0.9em; overflow-wrap: anywhere; }
h2 { font-size: 1.25em; margin: 2em 0 0.3em; }
h3 { font-size: 1.05em; margin: 0 0 0.3em; }
p { margin: 0.4em 0; }
.muted { color: var(--muted); }

.hero {
  background: var(--accent);
  color: var(--accent-text);
  text-align: center;
  padding: 40px 16px 32px;
}
.hero img { border-radius: 22px; box-shadow: 0 4px 18px rgb(0 0 0 / 0.25); }
.hero h1 { margin: 12px 0 4px; font-size: 1.9em; }
.hero p { max-width: 30em; margin: 0 auto 18px; opacity: 0.95; }
.hero .hint { margin-top: 12px; }

button, .button {
  font: inherit;
  font-weight: 600;
  display: inline-block;
  border: 0;
  border-radius: 10px;
  padding: 0.7em 1.4em;
  cursor: pointer;
  text-decoration: none;
}
.hero button { background: #fff; color: var(--accent); margin: 4px; }
.hero .button { background: rgb(255 255 255 / 0.15); color: #fff; border: 1px solid rgb(255 255 255 / 0.5); margin: 4px; }
button[hidden], [hidden] { display: none !important; }

main, footer { max-width: 680px; margin: 0 auto; padding: 0 16px; }
footer { padding: 32px 16px 48px; font-size: 0.9em; }

.note {
  background: var(--note);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  margin-top: 24px;
}

.steps { list-style: none; padding: 0; margin: 0; counter-reset: step; }
.steps > li {
  counter-increment: step;
  position: relative;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px 14px 58px;
  margin: 10px 0;
}
.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 14px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 700;
  display: grid;
  place-items: center;
}

.relay { display: grid; gap: 8px; margin: 8px 0; }
.relay label { font-weight: 600; }
.relay input {
  font: inherit;
  padding: 0.6em 0.75em;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  width: 100%;
}
.relay button { background: var(--accent); color: var(--accent-text); }
.relay .hint { color: #d93025; min-height: 0; }

.faq dt { font-weight: 600; margin-top: 12px; }
.faq dd { margin: 2px 0 0; color: var(--muted); }
.facts { padding-left: 1.2em; }
.facts li { margin: 6px 0; }