:root { --bg: #fafaf7; --fg: #1f2328; --muted: #5c6470; --line: #d9dcd3; --accent: #0b6e4f; --card: #ffffff; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #15181c; --fg: #e8eaed; --muted: #a2a9b4; --line: #343a43; --accent: #5ed3a8; --card: #1d2127; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); line-height: 1.75;
  font-family: system-ui, -apple-system, "Hiragino Sans", "Noto Sans JP", sans-serif; }
a { color: var(--accent); }
.site-header, main, .site-footer { max-width: 44rem; margin: 0 auto; padding: 0 1rem; }
.site-header { padding-top: 1rem; font-weight: 700; }
.site-header a { color: inherit; text-decoration: none; }
main { padding-top: 1rem; padding-bottom: 2rem; }
h1 { font-size: 1.6rem; line-height: 1.35; margin: .5rem 0; text-wrap: balance; }
h2 { font-size: 1.1rem; margin: 2rem 0 .5rem; }
.lead { color: var(--muted); margin-top: 0; }
.app { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 1rem; margin: 1.25rem 0; }
.app label { display: block; margin: .75rem 0 .25rem; font-weight: 600; }
.app input, .app select, .app button { font: inherit; padding: .55rem .7rem; border: 1px solid var(--line);
  border-radius: 8px; background: var(--bg); color: var(--fg); max-width: 100%; }
.app button { background: var(--accent); color: var(--bg); border-color: var(--accent); font-weight: 700; cursor: pointer; }
.app output, .app .result { display: block; margin-top: 1rem; font-size: 1.25rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.pr-note { font-size: .8rem; color: var(--muted); margin: 0; }
.pr-box { border: 1px solid var(--line); border-radius: 10px; padding: .25rem 1rem 1rem; }
.pr-tag { font-size: .7rem; border: 1px solid var(--muted); color: var(--muted); border-radius: 4px; padding: 0 .35rem; vertical-align: middle; }
.pr-memo, .updated, .site-footer { color: var(--muted); font-size: .85rem; }
.app-list { list-style: none; padding: 0; display: grid; gap: .75rem; }
.app-list a { display: grid; gap: .15rem; padding: .9rem 1rem; background: var(--card); border: 1px solid var(--line);
  border-radius: 10px; color: inherit; text-decoration: none; }
.app-list .cat { font-size: .75rem; color: var(--accent); }
.site-footer { border-top: 1px solid var(--line); padding-top: 1rem; padding-bottom: 2rem; }