:root {
  --ink: #0d0f14;
  --paper: #ffffff;
  --dim: #5b6270;
  --line: #e3e6ec;
  --accent: #1c4dd8;
  --note-bg: #f6f8fc;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #eef0f5;
    --paper: #0b0d12;
    --dim: #99a1b0;
    --line: #232733;
    --accent: #7c9bff;
    --note-bg: #12161f;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.7 ui-sans-serif, -apple-system, "Segoe UI", Inter, Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); }
.wrap { max-width: 44rem; margin: 0 auto; padding: 0 1.5rem; }
header { border-bottom: 1px solid var(--line); }
header .wrap { display: flex; align-items: center; height: 4rem; }
.mark { font-weight: 650; letter-spacing: -0.02em; font-size: 1.15rem; text-decoration: none; color: var(--ink); }
.mark span { color: var(--accent); }
main { padding: 3rem 0 4rem; }
h1 { font-size: clamp(1.8rem, 4vw, 2.5rem); letter-spacing: -0.025em; margin: 0 0 0.5rem; font-weight: 650; }
.updated { color: var(--dim); font-size: 0.92rem; margin: 0 0 2.5rem; }
h2 { font-size: 1.25rem; letter-spacing: -0.015em; margin: 2.5rem 0 0.75rem; font-weight: 620; }
h3 { font-size: 1.02rem; margin: 1.5rem 0 0.4rem; font-weight: 600; }
p, li { margin: 0 0 0.9rem; }
ul { padding-left: 1.3rem; }
table { width: 100%; border-collapse: collapse; margin: 1rem 0 1.5rem; font-size: 0.95rem; display: block; overflow-x: auto; }
th, td { text-align: left; padding: 0.6rem 0.75rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 600; color: var(--dim); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em; }
.note {
  background: var(--note-bg); border: 1px solid var(--line);
  border-radius: 8px; padding: 1rem 1.25rem; margin: 2rem 0;
  font-size: 0.95rem; color: var(--dim);
}
.note strong { color: var(--ink); }
footer { border-top: 1px solid var(--line); padding: 2rem 0 3rem; color: var(--dim); font-size: 0.9rem; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 1.25rem; }
footer nav { margin-left: auto; display: flex; gap: 1.25rem; flex-wrap: wrap; }
footer a { color: var(--dim); }