:root {
  --color-bg: #ffffff;
  --color-fg: #1a1a1a;
  --color-muted: #555;
  --color-link: #1E88E5;
  --color-link-hover: #00BFA5;
  --color-rule: #e6e6e6;
  --color-block-bg: #f6f7f9;
  --color-block-border: #d0d4da;
  --max-width: 760px;
  --radius: 6px;
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #111417;
    --color-fg: #e7eaee;
    --color-muted: #a8b0b8;
    --color-link: #4FC3F7;
    --color-link-hover: #80E8C4;
    --color-rule: #2a2f35;
    --color-block-bg: #1a1f25;
    --color-block-border: #2a2f35;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  background: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 20px 96px;
}

header.site-header {
  border-bottom: 1px solid var(--color-rule);
  padding: 16px 20px;
  font-weight: 600;
}

header.site-header a {
  color: inherit;
  text-decoration: none;
}
header.site-header a.brand-link:hover {
  color: var(--color-link);
}
header.site-header a.back-home-btn {
  font-size: 0.9em;
  font-weight: 500;
  padding: 6px 12px;
  border: 1px solid var(--color-rule);
  border-radius: var(--radius);
  color: var(--color-link);
}
header.site-header a.back-home-btn:hover {
  background: var(--color-link);
  color: var(--color-bg);
}

nav.lang-switcher {
  margin: 12px 0 24px;
  font-size: 0.9em;
}
nav.lang-switcher a {
  margin-right: 8px;
  padding: 4px 8px;
  border: 1px solid var(--color-rule);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-muted);
}
nav.lang-switcher a.active {
  border-color: var(--color-link);
  color: var(--color-link);
}

a { color: var(--color-link); text-decoration: underline; text-underline-offset: 2px; }
a:hover { color: var(--color-link-hover); }

h1 { font-size: 1.85em; line-height: 1.25; margin: 24px 0 16px; }
h2 { font-size: 1.4em;  line-height: 1.3;  margin: 28px 0 12px; border-bottom: 1px solid var(--color-rule); padding-bottom: 4px; }
h3 { font-size: 1.15em; line-height: 1.35; margin: 22px 0 10px; }
h4, h5, h6 { font-size: 1.0em; margin: 16px 0 8px; }

p { margin: 12px 0; }

ul, ol { margin: 12px 0 12px 24px; padding: 0; }
li { margin: 4px 0; }

blockquote {
  margin: 16px 0;
  padding: 8px 16px;
  border-left: 4px solid var(--color-link);
  background: var(--color-block-bg);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--color-muted);
}

code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--color-block-bg);
  padding: 1px 5px;
  border-radius: 4px;
}

pre {
  background: var(--color-block-bg);
  border: 1px solid var(--color-block-border);
  border-radius: var(--radius);
  padding: 12px 14px;
  overflow-x: auto;
  font-size: 0.9em;
}
pre code { background: transparent; padding: 0; }

table {
  border-collapse: collapse;
  width: 100%;
  margin: 16px 0;
  font-size: 0.95em;
}
th, td {
  border: 1px solid var(--color-rule);
  padding: 6px 10px;
  vertical-align: top;
  text-align: left;
}
th { background: var(--color-block-bg); }

hr {
  border: 0;
  border-top: 1px solid var(--color-rule);
  margin: 32px 0;
}

footer.doc-footer {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid var(--color-rule);
  font-size: 0.85em;
  color: var(--color-muted);
}