:root {
  --paper: #F5F0E8; --card: #FFFFFF; --ink: #2B2A28; --sub: #73706A; --accent: #C2553B; --line: #E0D9CC;
}
@media (prefers-color-scheme: dark) {
  :root { --paper: #1C1B19; --card: #262522; --ink: #EDE8DF; --sub: #A8A296; --accent: #F08A6E; --line: #3A3833; }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 16px/1.8 -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", sans-serif;
}
main { max-width: 720px; margin: 0 auto; padding: 40px 16px 64px; }
header a.brand { font-family: "Hiragino Mincho ProN", "Noto Serif JP", Georgia, serif; font-weight: 700; font-size: 20px; color: var(--ink); text-decoration: none; }
nav { margin-top: 6px; font-size: 14px; display: flex; gap: 16px; flex-wrap: wrap; }
a { color: var(--accent); }
h1 { font-family: "Hiragino Mincho ProN", "Noto Serif JP", Georgia, serif; font-size: 28px; line-height: 1.4; margin: 32px 0 4px; }
h2 { font-size: 18px; margin: 36px 0 8px; padding-top: 12px; border-top: 1px solid var(--line); }
.meta { color: var(--sub); font-size: 14px; margin: 0 0 24px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 4px 20px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; vertical-align: top; padding: 10px 8px; border-bottom: 1px solid var(--line); }
th { color: var(--sub); font-weight: 600; white-space: nowrap; }
.scroll { overflow-x: auto; }
dt { font-weight: 700; margin-top: 20px; }
dd { margin: 4px 0 0; }
footer { margin-top: 48px; color: var(--sub); font-size: 13px; }
.hero p { font-size: 18px; }
.button { display: inline-block; margin-top: 12px; padding: 12px 22px; border-radius: 999px; background: var(--ink); color: var(--paper); text-decoration: none; font-weight: 700; }