:root {
  --bg: #ffffff;
  --surface: #f5f5f7;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --border: #e3e3e6;
  --accent: #0a84ff;
  --maxw: 760px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --surface: #1c1c1e;
    --text: #f5f5f7;
    --muted: #98989d;
    --border: #2c2c2e;
    --accent: #0a84ff;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
  font-size: 16px;
  word-break: break-word;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 32px 20px 80px;
}

header.site {
  border-bottom: 1px solid var(--border);
  padding: 20px;
}
header.site .inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}
header.site .app { font-weight: 700; font-size: 18px; }
header.site .en { color: var(--muted); font-size: 14px; }

h1 { font-size: 26px; line-height: 1.4; margin: 8px 0 4px; }
h2 { font-size: 20px; margin: 40px 0 10px; padding-top: 8px; }
h3 { font-size: 16px; margin: 24px 0 6px; color: var(--muted); font-weight: 700; }
p, li { font-size: 16px; }
ul { padding-left: 1.3em; }
li { margin: 6px 0; }
.updated { color: var(--muted); font-size: 14px; margin-top: 0; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 20px;
  margin: 14px 0;
  color: inherit;
}
.card:hover { border-color: var(--accent); text-decoration: none; }
.card .t { font-weight: 700; font-size: 17px; }
.card .d { color: var(--muted); font-size: 14px; margin-top: 4px; }

.lang-note {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 14px;
  font-size: 14px;
  color: var(--muted);
  margin: 20px 0;
}
.sep { border: none; border-top: 1px solid var(--border); margin: 56px 0 8px; }
footer {
  color: var(--muted);
  font-size: 13px;
  text-align: center;
  padding: 24px 20px 48px;
}
.backlink { display: inline-block; margin-bottom: 8px; font-size: 14px; }