:root {
  color-scheme: light dark;
  --bg: #FAF9F7;
  --surface: #FFFFFF;
  --border: #E7E3DD;
  --text: #16171C;
  --text-secondary: #6B6E78;
  --accent: #FF6B47;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12141B;
    --surface: #1B1E27;
    --border: #2E3340;
    --text: #F5F4F2;
    --text-secondary: #9A9DA8;
    --accent: #FF7A54;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #12141B; --surface: #1B1E27; --border: #2E3340;
  --text: #F5F4F2; --text-secondary: #9A9DA8; --accent: #FF7A54;
}
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #FAF9F7; --surface: #FFFFFF; --border: #E7E3DD;
  --text: #16171C; --text-secondary: #6B6E78; --accent: #FF6B47;
}
.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center; margin-left: 20px;
  width: 36px; height: 36px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text-secondary); cursor: pointer; flex-shrink: 0;
}
.theme-toggle svg { width: 16px; height: 16px; }
.theme-toggle .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  .theme-toggle .icon-sun { display: none; }
  .theme-toggle .icon-moon { display: block; }
}
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: block; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: none; }
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh;
}
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 20px;
  flex-wrap: wrap;
  gap: 12px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: "Space Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 20px;
  color: var(--text);
  text-decoration: none;
}
.brand-mark {
  stroke: var(--accent);
  flex-shrink: 0;
}
nav a {
  color: var(--text-secondary);
  text-decoration: none;
  margin-left: 20px;
  font-size: 14px;
  font-weight: 600;
}
nav a:first-child { margin-left: 0; }
nav a[aria-current="page"] { color: var(--accent); }
main {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px 60px;
}
h1 {
  font-size: 28px;
  margin-bottom: 20px;
}
pre#content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  white-space: pre-wrap;
  word-wrap: break-word;
  font-family: inherit;
  font-size: 15px;
  line-height: 1.6;
}
footer {
  text-align: center;
  color: var(--text-secondary);
  font-size: 13px;
  padding: 24px 20px 40px;
}