:root {
  --bg: #101215;
  --panel: #171a1f;
  --line: #2a2f37;
  --text: #e8ebef;
  --muted: #98a1ad;
  --accent: #d8ff3e;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP",
    "Yu Gothic UI", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.9;
}

a { color: var(--accent); }
a:hover { text-decoration: none; }

header.site,
footer.site,
main {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px;
}

header.site { padding-top: 28px; padding-bottom: 8px; }

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  color: var(--accent);
  text-decoration: none;
  letter-spacing: 0.02em;
}
.brand span { color: var(--muted); font-size: 13px; font-weight: 400; }

main { padding-bottom: 56px; }

h1 {
  font-size: 26px;
  line-height: 1.5;
  margin: 28px 0 24px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--accent);
}

h2 {
  font-size: 19px;
  line-height: 1.6;
  margin: 44px 0 12px;
  padding-left: 12px;
  border-left: 4px solid var(--accent);
}

h3 { font-size: 16.5px; margin: 30px 0 8px; color: var(--accent); }

p, li { overflow-wrap: anywhere; }

ul, ol { padding-left: 1.4em; }
li { margin: 6px 0; }

strong { color: #fff; }

blockquote {
  margin: 20px 0;
  padding: 14px 18px;
  background: var(--panel);
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
}
blockquote p:first-child { margin-top: 0; }
blockquote p:last-child { margin-bottom: 0; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 15px;
  display: block;
  overflow-x: auto;
}
th, td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}
th { background: var(--panel); color: #fff; white-space: nowrap; }

hr { border: 0; border-top: 1px solid var(--line); margin: 40px 0; }

code {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1px 6px;
  font-size: 0.9em;
}

ul.cards { list-style: none; padding: 0; }
ul.cards li { margin: 10px 0; }
ul.cards a {
  display: block;
  padding: 16px 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  text-decoration: none;
  font-weight: 700;
}
ul.cards a:hover { border-color: var(--accent); }

footer.site {
  border-top: 1px solid var(--line);
  padding-top: 24px;
  padding-bottom: 56px;
  color: var(--muted);
  font-size: 14px;
}
footer.site ul { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 20px; }
footer.site .corp { margin-top: 20px; line-height: 1.8; }

@media (max-width: 480px) {
  body { font-size: 15px; }
  h1 { font-size: 22px; }
}