:root {
  --bg: #FFFFFF; --text: #111114; --sub: #6E6E76; --rule: #EDEDF0;
  --accent: #2F5BFF; --accent-soft: #E9EEFF;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0E0E10; --text: #F2F2F5; --sub: #9A9AA2; --rule: #26262B; --accent: #6B8BFF; --accent-soft: #1C2340; }
}
* { box-sizing: border-box; }
body {
  margin: 0; padding: 0 20px 80px; background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Helvetica Neue", sans-serif;
  font-size: 16px; line-height: 1.85;
}
main { max-width: 720px; margin: 0 auto; }
/* 中国語・韓国語のページで漢字を日本の字形（ヒラギノ）で出さない */
:lang(zh-Hans) body, body:lang(zh-Hans) { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif; }
:lang(zh-Hant) body, body:lang(zh-Hant) { font-family: -apple-system, BlinkMacSystemFont, "PingFang TC", "Microsoft JhengHei", "Noto Sans TC", sans-serif; }
:lang(ko) body, body:lang(ko) { font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", sans-serif; }
a { color: var(--accent); }
.langbar { max-width: 720px; margin: 0 auto; padding: 14px 0; display: flex; flex-wrap: wrap; gap: 6px 14px; justify-content: flex-end; font-size: 13px; }
.langbar a { color: var(--sub); text-decoration: none; }
.langbar a[aria-current="true"] { color: var(--text); font-weight: 600; }
.hero { padding: 40px 0 24px; }
.app-name { font-size: 12px; letter-spacing: .18em; color: var(--sub); margin: 0 0 10px; }
h1 { font-size: 34px; font-weight: 600; letter-spacing: -.02em; line-height: 1.3; margin: 0 0 16px; }
h1 span { display: inline-block; }
.lead { color: var(--sub); margin: 0 0 24px; }
.badge { display: inline-block; background: var(--text); color: var(--bg); text-decoration: none; padding: 12px 22px; border-radius: 14px; font-weight: 600; }
.flash { font-size: 120px; font-weight: 200; line-height: 1; text-align: center; margin: 32px 0; letter-spacing: -.04em; font-variant-numeric: tabular-nums; }
h2 { font-size: 20px; margin: 48px 0 12px; }
ul.features, ol.steps { padding-left: 1.2em; }
ul.features li, ol.steps li { margin: 6px 0; }
ol.steps strong { display: block; }
ol.steps span { color: var(--sub); }
.shots { display: flex; gap: 12px; overflow-x: auto; padding-bottom: 8px; }
.shots img { width: 200px; border-radius: 18px; border: 1px solid var(--rule); flex: none; }
.note { color: var(--sub); font-size: 14px; }
footer { border-top: 1px solid var(--rule); margin-top: 56px; padding-top: 20px; font-size: 13px; color: var(--sub); }
footer p { margin: 6px 0; }
footer a { color: var(--sub); margin-right: 14px; }