:root {
  --navy: #050451;
  --navy-light: #405aab;
  --lavender: #dcd7ff;
  --cream: #fffbf5;
  --text: #1c1b2e;
  --muted: #5d5b74;
  --border: #e6e1d8;
  --code-bg: #f4f1ff;
  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  margin: 0;
  background: var(--cream);
  color: var(--text);
  font: 15px/1.7 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

a { color: var(--navy-light); }

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 24px;
  background: var(--cream);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--navy);
  font-weight: 600;
  text-decoration: none;
}

.brand img { border-radius: 8px; }

.brand small {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 400;
  line-height: 1.2;
}

.brand span { line-height: 1.2; }

.os-switch {
  display: flex;
  margin-left: auto;
  padding: 3px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.os-switch button {
  padding: 4px 12px;
  background: none;
  border: 0;
  border-radius: 6px;
  color: var(--muted);
  font: inherit;
  font-size: 13px;
  cursor: pointer;
}

body[data-os="mac"] [data-set-os="mac"],
body[data-os="win"] [data-set-os="win"] {
  background: var(--navy);
  color: #fff;
}

.console {
  padding: 6px 14px;
  background: var(--navy);
  border-radius: 8px;
  color: #fff;
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
}

.layout {
  display: grid;
  grid-template-columns: 200px minmax(0, 720px);
  gap: 48px;
  justify-content: center;
  padding: 32px 24px 64px;
}

.toc {
  position: sticky;
  top: 88px;
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.toc a {
  padding: 6px 10px;
  border-radius: 6px;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

.toc a:hover { background: var(--lavender); color: var(--navy); }

h1 { margin: 0 0 12px; color: var(--navy); font-size: 28px; line-height: 1.3; }

h2 {
  margin: 0 0 12px;
  color: var(--navy);
  font-size: 20px;
  line-height: 1.4;
}

section { padding: 32px 0; border-bottom: 1px solid var(--border); }

section.intro { padding-top: 0; }

section:last-child { border-bottom: 0; }

p { margin: 0 0 12px; }

.steps { margin: 0 0 16px; padding-left: 22px; }

.steps > li { margin-bottom: 14px; padding-left: 4px; }

.steps > li::marker { color: var(--navy); font-weight: 600; }

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

code {
  padding: 1px 5px;
  background: var(--code-bg);
  border-radius: 4px;
  font: 13px/1.6 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

pre {
  position: relative;
  margin: 0 0 10px;
  padding: 12px 14px;
  overflow-x: auto;
  background: var(--navy);
  border-radius: 8px;
}

pre code {
  padding: 0;
  background: none;
  color: #f4f1ff;
  white-space: pre;
}

.copy {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 2px 10px;
  background: rgba(255, 255, 255, 0.12);
  border: 0;
  border-radius: 6px;
  color: #fff;
  font: inherit;
  font-size: 12px;
  cursor: pointer;
}

.copy:hover { background: rgba(255, 255, 255, 0.24); }

.note {
  padding: 10px 14px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--muted);
  font-size: 14px;
}

body[data-os="mac"] [data-os-only="win"],
body[data-os="win"] [data-os-only="mac"] { display: none; }

footer {
  padding: 24px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

@media (max-width: 860px) {
  .layout { grid-template-columns: minmax(0, 1fr); gap: 0; padding-top: 20px; }
  .toc { display: none; }
  .topbar { flex-wrap: wrap; padding: 10px 16px; gap: 10px; }
  .os-switch { order: 3; margin-left: 0; width: 100%; }
  .os-switch button { flex: 1; }
  .console { margin-left: auto; }
  pre { padding-top: 36px; }
}