/* about.html / privacy.html 共通。色は bpm_finder.html と揃える */
:root {
  --bg: #f6f6f4; --card: #fff; --fg: #1b1b1b; --muted: #6b6b6b; --line: #e3e3e0; --accent: #e4572e; --chip: #efefec;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121212; --card: #1c1c1c; --fg: #ececec; --muted: #9a9a9a; --line: #2e2e2e; --accent: #ff7a52; --chip: #2a2a2a;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg);
       font: 15px/1.7 -apple-system, BlinkMacSystemFont, "Hiragino Sans", sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 16px; }
.top { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; margin: 4px 0 8px; }
.back { color: var(--accent); text-decoration: none; font-weight: 600; white-space: nowrap; }
.langs { display: flex; gap: 2px; background: var(--chip); border-radius: 8px; padding: 2px; }
.langs button { font: inherit; font-size: 13px; line-height: 1.5; border: 0; border-radius: 8px; padding: 4px 8px;
                cursor: pointer; background: none; color: var(--muted); white-space: nowrap; }
.langs button[aria-pressed="true"] { background: var(--card); color: var(--fg); font-weight: 600; }
h1 { font-size: 24px; line-height: 1.3; margin: 8px 0 4px; }
h2 { font-size: 18px; margin: 28px 0 8px; }
.updated { color: var(--muted); font-size: 13px; margin: 0 0 16px; }
a { color: var(--accent); }
ol, ul { padding-left: 1.4em; }
li { margin: 4px 0; }
.foot { color: var(--muted); font-size: 13px; text-align: center; margin: 40px 0 8px; line-height: 1.8;
        border-top: 1px solid var(--line); padding-top: 16px; }
.foot a { color: inherit; }