:root {
  --bg: #f6f8fa;
  --card: #ffffff;
  --text: #142033;
  --muted: #5b6b7c;
  --accent: #1a9fd4;
  --border: #d9e2ec;
  --max: 44rem;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: linear-gradient(180deg, #e8f6fc 0%, var(--bg) 220px);
  color: var(--text);
  line-height: 1.55;
}
.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
}
.brand {
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  font-size: 1.1rem;
}
nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 1rem;
  font-weight: 600;
}
nav a:hover { color: var(--accent); }
.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}
h1 { font-size: 2rem; margin: 0 0 0.5rem; }
h2 { font-size: 1.15rem; margin: 1.75rem 0 0.5rem; }
p, li { color: var(--text); }
.lede, .meta, .updated { color: var(--muted); }
.updated { font-size: 0.95rem; margin-bottom: 1.5rem; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.25rem 1.35rem;
}
ul.links { padding-left: 1.2rem; }
ul.links a { color: var(--accent); font-weight: 600; }
a { color: var(--accent); }
.notice {
  background: #fff8e8;
  border: 1px solid #f0d9a0;
  border-radius: 10px;
  padding: 0.85rem 1rem;
  color: #6a5320;
  margin: 1rem 0 1.5rem;
}