:root {
  --bg: #000;
  --ink: #fff;
  --ink-2: #9a9a9e;
  --ink-3: #6e6e73;
  --sheet: #151516;
  --line: #2a2a2c;
  --accent: #ff3118;
  --max: 720px;
}
* { box-sizing: border-box; }
html { color-scheme: dark; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic UI", system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--ink); text-decoration-color: var(--ink-3); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--accent); }
header.site {
  max-width: var(--max);
  margin: 0 auto;
  padding: 28px 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; letter-spacing: -0.02em; font-size: 18px; }
.brand .dot { width: 12px; height: 12px; border-radius: 50%; background: var(--accent); }
nav.site a { color: var(--ink-2); text-decoration: none; margin-left: 18px; font-size: 14px; }
nav.site a:hover { color: var(--ink); }
main { max-width: var(--max); margin: 0 auto; padding: 40px 20px 80px; }
h1 { font-size: 30px; line-height: 1.3; letter-spacing: -0.02em; margin: 0 0 8px; }
h2 { font-size: 19px; margin: 40px 0 10px; letter-spacing: -0.01em; }
h3 { font-size: 16px; margin: 24px 0 6px; }
p { margin: 0 0 14px; }
.meta { color: var(--ink-2); font-size: 13px; margin-bottom: 28px; }
.lead { color: var(--ink-2); font-size: 17px; }
ul, ol { padding-left: 1.4em; }
li { margin-bottom: 6px; }
.card { background: var(--sheet); border-radius: 20px; padding: 20px 22px; margin: 18px 0; }
.card h3 { margin-top: 0; }
.pill {
  display: inline-block; background: var(--ink); color: #0f0f0f; text-decoration: none; font-weight: 800;
  border-radius: 999px; padding: 12px 22px; font-size: 14px;
}
.pill.ghost { background: var(--sheet); color: var(--ink); }
.pill + .pill { margin-left: 8px; }
.id { font-family: "Archivo", ui-monospace, SFMono-Regular, Menlo, monospace; font-weight: 800; letter-spacing: 0.08em; }
table { border-collapse: collapse; width: 100%; font-size: 14px; margin: 10px 0 18px; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--ink-2); font-weight: 500; white-space: nowrap; }
hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }
footer.site {
  max-width: var(--max); margin: 0 auto; padding: 0 20px 48px; color: var(--ink-3); font-size: 13px;
  display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center;
}
footer.site a { color: var(--ink-3); text-decoration: none; }
footer.site a:hover { color: var(--ink); }
.hero { padding: 56px 0 24px; }
.hero h1 { font-size: 44px; }
.hero .tag { color: var(--accent); font-weight: 800; letter-spacing: 0.12em; font-size: 12px; text-transform: uppercase; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; margin: 24px 0; }
.grid .card { margin: 0; }
.grid .card b { display: block; margin-bottom: 4px; }
.grid .card span { color: var(--ink-2); font-size: 14px; }
@media (max-width: 480px) {
  .hero h1 { font-size: 34px; }
  nav.site a { margin-left: 12px; }
}