:root {
  --bg: #f7f7f5;
  --card: #ffffff;
  --text: #1c1c1e;
  --muted: #6b6b70;
  --line: #e4e4e0;
  --accent: #1f5eff;
  --accent-soft: #eef3ff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111113;
    --card: #19191c;
    --text: #ececef;
    --muted: #9a9aa2;
    --line: #2a2a2f;
    --accent: #7ea2ff;
    --accent-soft: #1b2236;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); }
header {
  border-bottom: 1px solid var(--line);
  background: var(--card);
}
.bar {
  max-width: 820px;
  margin: 0 auto;
  padding: 14px 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  align-items: center;
  justify-content: space-between;
}
.brand { font-weight: 700; letter-spacing: -0.01em; color: var(--text); text-decoration: none; }
nav { display: flex; flex-wrap: wrap; gap: 4px 16px; font-size: 14px; }
nav a { color: var(--muted); text-decoration: none; }
nav a[aria-current="page"] { color: var(--accent); font-weight: 600; }
main {
  max-width: 820px;
  margin: 28px auto 48px;
  padding: 0 16px;
}
article {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 28px 28px 32px;
}
@media (max-width: 560px) { article { padding: 22px 18px 26px; } }
h1 { font-size: 28px; line-height: 1.25; margin: 0 0 6px; letter-spacing: -0.02em; }
h2 { font-size: 19px; margin: 32px 0 8px; letter-spacing: -0.01em; }
h3 { font-size: 16px; margin: 20px 0 6px; }
.meta { color: var(--muted); font-size: 14px; margin: 0 0 20px; }
ul, ol { padding-left: 22px; }
li { margin: 4px 0; }
.box {
  background: var(--accent-soft);
  border-radius: 10px;
  padding: 14px 16px;
  margin: 16px 0;
}
.box p { margin: 0; }
code { font-size: 14px; background: var(--accent-soft); padding: 1px 6px; border-radius: 5px; }
footer {
  max-width: 820px;
  margin: 0 auto 40px;
  padding: 0 16px;
  color: var(--muted);
  font-size: 13px;
}
.cards { display: grid; gap: 12px; margin-top: 18px; }
.cards a {
  display: block;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
  text-decoration: none;
  color: var(--text);
}
.cards a strong { display: block; color: var(--accent); }
.cards a span { color: var(--muted); font-size: 14px; }