:root {
  --bg: #ffffff;
  --text: #23272f;
  --muted: #5e687e;
  --line: #e6e8eb;
  --accent: #087ea4;
  --code-bg: #f6f7f9;
  --mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.75 var(--sans);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
  width: min(760px, calc(100% - 48px));
  margin: 0 auto;
}

/* header */

header { border-bottom: 1px solid var(--line); }

header .wrap {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 60px;
}

.logo {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--text);
}

.logo:hover { text-decoration: none; }

nav {
  margin-left: auto;
  display: flex;
  gap: 22px;
  font-size: 15px;
}

nav a { color: var(--muted); }
nav a:hover { color: var(--text); text-decoration: none; }
nav a[aria-current="page"] { color: var(--text); font-weight: 500; }

/* content */

main { padding: 72px 0 96px; }

h1 {
  font-size: clamp(34px, 5vw, 46px);
  line-height: 1.15;
  letter-spacing: -.025em;
  font-weight: 700;
  margin: 0 0 20px;
  max-width: 18ch;
}

h2 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -.01em;
  margin: 56px 0 12px;
}

h3 {
  font-size: 16px;
  font-weight: 600;
  margin: 28px 0 6px;
}

p { max-width: 66ch; margin: 0 0 16px; }

.lead {
  font-size: 19px;
  line-height: 1.65;
  color: var(--muted);
  max-width: 56ch;
  margin-bottom: 32px;
}

.actions {
  display: flex;
  align-items: center;
  gap: 8px 20px;
  flex-wrap: wrap;
  margin: 32px 0 14px;
}

.btn {
  display: inline-block;
  background: #23272f;
  color: #fff;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
}

.btn:hover { background: #000; text-decoration: none; }

.btn-link { font-size: 15px; }

.note { color: var(--muted); font-size: 14px; margin: 0; }

ul, ol { max-width: 66ch; margin: 0 0 20px; padding-left: 22px; }
li { margin-bottom: 8px; }

code {
  font: 13.5px/1.5 var(--mono);
  background: var(--code-bg);
  border-radius: 4px;
  padding: 2px 5px;
  color: #24292f;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px 18px;
  overflow-x: auto;
  margin: 0 0 20px;
}

pre code {
  background: none;
  padding: 0;
  font-size: 13px;
  line-height: 1.65;
}

/* tables */

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  margin: 0 0 20px;
}

th, td {
  text-align: left;
  padding: 10px 12px 10px 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
}

td code { white-space: nowrap; }

/* steps */

.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
}

.steps > li {
  counter-increment: step;
  position: relative;
  padding-left: 40px;
  margin-bottom: 28px;
}

.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 2px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #23272f;
  color: #fff;
  font-size: 13px;
  line-height: 24px;
  text-align: center;
}

.steps > li p { margin-bottom: 8px; }

/* faq */

details {
  border-bottom: 1px solid var(--line);
  padding: 14px 0;
}

details:first-of-type { border-top: 1px solid var(--line); }

summary { cursor: pointer; font-weight: 500; }

details p { margin: 10px 0 0; color: var(--muted); }

/* copy row */

.copy {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  margin: 0 0 20px;
}

.copy code {
  background: none;
  padding: 0;
  flex: 1;
  font-size: 12px;
  word-break: break-all;
}

.copy button {
  font: 12px/1 var(--mono);
  color: var(--muted);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 6px 8px;
  cursor: pointer;
}

.copy button:hover { color: var(--text); }

footer {
  border-top: 1px solid var(--line);
  padding: 28px 0;
  color: var(--muted);
  font-size: 14px;
}

footer .wrap {
  display: flex;
  justify-content: space-between;
  gap: 12px 24px;
  flex-wrap: wrap;
}

@media (max-width: 640px) {
  main { padding: 48px 0 64px; }
  header .wrap { gap: 16px; }
  nav { gap: 16px; font-size: 14px; }
}