:root {
  --bg: #0f1419;
  --card: #1a222c;
  --text: #e7eef7;
  --muted: #9aa8b6;
  --accent: #3d8bfd;
  --line: #2a3542;
  --max: 880px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: radial-gradient(1200px 600px at 10% -10%, #1b2a40 0%, var(--bg) 55%);
  color: var(--text);
  line-height: 1.65;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 24px 18px 64px; }
header {
  display: flex; flex-wrap: wrap; gap: 12px 24px;
  align-items: baseline; justify-content: space-between;
  border-bottom: 1px solid var(--line); padding-bottom: 16px; margin-bottom: 28px;
}
.brand { font-size: 1.15rem; font-weight: 700; letter-spacing: .02em; color: var(--text); }
nav { display: flex; flex-wrap: wrap; gap: 14px; color: var(--muted); }
nav a { color: var(--muted); }
nav a:hover { color: var(--text); }
h1 { font-size: 1.9rem; line-height: 1.25; margin: 0 0 12px; }
h2 { font-size: 1.35rem; margin: 28px 0 10px; }
h3 { font-size: 1.1rem; margin: 20px 0 8px; }
p, li { color: #d5dee8; }
.lead { font-size: 1.08rem; color: var(--muted); max-width: 62ch; }
.meta { color: var(--muted); font-size: .92rem; }
.grid { display: grid; gap: 14px; margin-top: 22px; }
@media (min-width: 720px) { .grid { grid-template-columns: 1fr 1fr; } }
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 12px; padding: 16px 16px 14px;
}
.card h3 { margin-top: 0; }
.card p { margin: 0 0 10px; color: var(--muted); font-size: .95rem; }
.btn {
  display: inline-block; margin-top: 8px; padding: 10px 14px;
  background: var(--accent); color: #fff !important; border-radius: 8px;
  text-decoration: none !important; font-weight: 600;
}
.btn:hover { filter: brightness(1.08); }
footer {
  margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line);
  color: var(--muted); font-size: .9rem;
}
article { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 22px 20px; }
code, pre {
  font-family: ui-monospace, Consolas, monospace;
  background: #10161d; border-radius: 6px;
}
code { padding: 1px 5px; font-size: .92em; }
pre { padding: 12px; overflow: auto; border: 1px solid var(--line); }
ul { padding-left: 1.2rem; }