:root {
  color-scheme: light;
  --bg: #f8fafc;
  --panel: #ffffff;
  --panel-soft: #f1f5f9;
  --text: #0f172a;
  --muted: #475569;
  --accent: #0284c7;
  --accent-soft: #0ea5e9;
  --border: #cbd5e1;
  --card: #ffffff;
  --screen-bg: #f1f5f9;
}
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
  background: var(--bg);
  color: var(--text);
}
a { color: #0369a1; }
a:hover { color: #0284c7; }
header, main, footer {
  max-width: 980px;
  margin: 0 auto;
  padding: 1.2rem;
}
header {
  padding-top: 2rem;
  padding-bottom: 0.75rem;
}
nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1rem 0 0;
}
nav a {
  text-decoration: none;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--panel-soft);
}
section, article {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1rem 1.1rem;
  margin: 1rem 0;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}
.card h3 {
  margin-top: 0;
}
ul {
  padding-left: 1.2rem;
}
pre.screen {
  background: var(--screen-bg);
  color: #0f172a;
  border: 1px solid #94a3b8;
  border-radius: 12px;
  padding: 1rem;
  overflow-x: auto;
  font-family: "Courier New", Courier, monospace;
  line-height: 1.35;
}
.note {
  border-left: 4px solid var(--accent);
  padding-left: 0.9rem;
  color: var(--muted);
}
.table-like {
  display: grid;
  grid-template-columns: minmax(150px, 220px) 1fr;
  gap: 0.45rem 0.9rem;
}
footer {
  color: var(--muted);
  padding-top: 0;
  padding-bottom: 2rem;
}
.small { font-size: 0.95rem; color: var(--muted); }
@media (max-width: 640px) {
  .table-like { grid-template-columns: 1fr; }
}