/* Senteron site — minimal stylesheet
 * Plain HTML + a bit of CSS, no JS, no toolchain.
 * Looks reasonable on phone and desktop without media queries doing real work.
 */

:root {
  --fg: #1a1a1a;
  --fg-muted: #5a5a5a;
  --bg: #ffffff;
  --bg-accent: #f5f7fa;
  --accent: #1f4ed0;
  --border: #e1e4e8;
  --code-bg: #f3f4f6;
  --max-width: 720px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

header {
  border-bottom: 1px solid var(--border);
  padding: 1.2rem 1.5rem;
  background: var(--bg);
}

header .row {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

header img.glyph {
  width: 40px;
  height: 40px;
  border-radius: 8px;
}

header .title {
  font-weight: 600;
  font-size: 1.05rem;
}

header nav {
  margin-left: auto;
  font-size: 0.95rem;
}

header nav a {
  margin-left: 1.2rem;
  color: var(--fg-muted);
}

header nav a.active { color: var(--fg); font-weight: 500; }

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

h1 {
  font-size: 2rem;
  line-height: 1.2;
  margin: 0 0 0.4rem;
}

h1 .tag {
  font-size: 0.7rem;
  vertical-align: middle;
  background: var(--bg-accent);
  color: var(--fg-muted);
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  margin-left: 0.5rem;
  font-weight: 500;
}

h2 {
  font-size: 1.3rem;
  margin: 2rem 0 0.5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.3rem;
}

h3 { font-size: 1.05rem; margin: 1.4rem 0 0.4rem; }

p, ul, ol { margin: 0.6rem 0; }
ul, ol { padding-left: 1.4rem; }
li { margin: 0.2rem 0; }

code, pre {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9em;
}

code {
  background: var(--code-bg);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
}

pre {
  background: var(--code-bg);
  padding: 0.9rem 1.1rem;
  border-radius: 6px;
  overflow-x: auto;
  line-height: 1.45;
  margin: 0.8rem 0;
}

pre code { background: none; padding: 0; }

.lede {
  font-size: 1.15rem;
  color: var(--fg-muted);
  margin: 0.6rem 0 1.6rem;
}

.callout {
  background: var(--bg-accent);
  border-left: 3px solid var(--accent);
  padding: 0.8rem 1.1rem;
  margin: 1.2rem 0;
  border-radius: 0 4px 4px 0;
}

.callout strong { color: var(--fg); }

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.95rem;
  margin: 0.8rem 0;
}

th, td {
  text-align: left;
  padding: 0.5rem 0.8rem;
  border-bottom: 1px solid var(--border);
}

th { font-weight: 600; color: var(--fg-muted); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.03em; }

footer {
  border-top: 1px solid var(--border);
  padding: 2rem 1.5rem;
  color: var(--fg-muted);
  font-size: 0.85rem;
}

footer .row {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.4rem;
}

footer a { color: var(--fg-muted); }

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e6e6e6;
    --fg-muted: #9aa1ab;
    --bg: #0d1117;
    --bg-accent: #161b22;
    --accent: #6ea0ff;
    --border: #23292f;
    --code-bg: #161b22;
  }
}