:root {
  --bg: #f2f2f7;
  --card: #ffffff;
  --ink: #111114;
  --text: #1c1c1e;
  --muted: #6e6e73;
  --line: rgba(60, 60, 67, 0.14);
  --green: #00897b;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --card: #1c1c1e;
    --ink: #f5f5f7;
    --text: #f5f5f7;
    --muted: #98989d;
    --line: rgba(235, 235, 245, 0.16);
    --green: #30d1bd;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--ink); text-underline-offset: 3px; }
.wrap { max-width: 680px; margin: 0 auto; padding: 0 20px; }

header.bar { padding: 18px 0; }
header.bar .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 700; font-size: 18px; color: var(--text); }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
nav { display: flex; gap: 18px; font-size: 15px; }
img { max-width: 100%; }
nav a { color: var(--muted); text-decoration: none; }
nav a[aria-current="page"] { color: var(--text); font-weight: 600; }

.hero { text-align: center; padding: 56px 0 40px; }
.hero img { width: 112px; height: 112px; border-radius: 26px; box-shadow: 0 18px 40px rgba(0, 0, 0, 0.18); }
.hero h1 { font-size: clamp(34px, 7vw, 48px); line-height: 1.1; letter-spacing: -0.02em; margin: 28px 0 12px; }
.hero p { color: var(--muted); font-size: 19px; margin: 0 auto; max-width: 30em; }
.badge { display: inline-block; margin-top: 28px; padding: 13px 22px; border-radius: 999px; background: var(--ink); color: var(--bg); font-weight: 600; text-decoration: none; }

.card { background: var(--card); border-radius: 22px; padding: 22px; margin: 0 0 16px; }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-bottom: 16px; }
.grid .card { margin: 0; }
.card h3 { margin: 0 0 4px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.promise { display: flex; flex-direction: column; gap: 10px; }
.promise div { display: flex; gap: 12px; align-items: baseline; }
.promise span { color: var(--green); font-weight: 700; }

.doc { padding: 24px 0 8px; }
.doc h1 { font-size: 34px; letter-spacing: -0.02em; margin: 8px 0 4px; }
.doc .meta { color: var(--muted); margin: 0 0 24px; font-size: 15px; }
.doc h2 { font-size: 19px; margin: 0 0 6px; }
.doc .card p { color: var(--text); font-size: 16px; }
.doc .card p + p { margin-top: 10px; }
.lead { font-size: 18px; margin: 0 0 20px; }

details { background: var(--card); border-radius: 18px; padding: 16px 20px; margin-bottom: 10px; }
summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--muted); font-weight: 400; }
details[open] summary::after { content: "–"; }
details p { margin: 10px 0 0; color: var(--muted); font-size: 16px; }

footer { color: var(--muted); font-size: 14px; padding: 32px 0 48px; text-align: center; }
footer a { color: var(--muted); }

@media (max-width: 520px) {
  .grid { grid-template-columns: minmax(0, 1fr); }
  nav { gap: 14px; }
  .brand span { display: none; }
  .hero { padding-top: 36px; }
}