:root {
  color-scheme: light dark;
  --paper: #f1ebdd;
  --card: #fbf8ef;
  --ink: #262823;
  --ink-soft: #555a4e;
  --ink-muted: #696b60;
  --line: #d8d8cd;
  --olive: #576044;
  --accent: #975d43;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1b1c18;
    --card: #24261f;
    --ink: #f1ede2;
    --ink-soft: #cfcbbf;
    --ink-muted: #a9a698;
    --line: #3a3c33;
    --olive: #a8b38a;
    --accent: #e0a07f;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Helvetica Neue", sans-serif;
  line-height: 1.75;
  -webkit-text-size-adjust: 100%;
}
main { max-width: 680px; margin: 0 auto; padding: 40px 16px 72px; }
header { display: flex; gap: 16px; align-items: center; margin-bottom: 8px; }
.mark {
  flex: none; width: 56px; height: 56px; border-radius: 14px;
  background: #576044; color: #fbf8ef;
  display: grid; place-items: center; font-size: 28px; font-weight: 700;
}
h1 { font-size: 26px; line-height: 1.3; margin: 0; }
.sub { color: var(--ink-muted); font-size: 14px; margin: 0; }
h2 { font-size: 18px; margin: 36px 0 8px; color: var(--olive); }
h3 { font-size: 15.5px; margin: 20px 0 4px; }
p, li { color: var(--ink-soft); font-size: 15px; }
ul { padding-left: 20px; }
a { color: var(--accent); }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 16px 18px; margin-top: 16px;
}
.card p:first-child { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }
.muted { color: var(--ink-muted); font-size: 13px; }
nav { margin-top: 20px; display: flex; flex-wrap: wrap; gap: 8px 16px; font-size: 14px; }
hr { border: none; border-top: 1px solid var(--line); margin: 40px 0 24px; }
footer { color: var(--ink-muted); font-size: 13px; }