:root {
  --bg: #ffffff;
  --fg: #1c1c1e;
  --muted: #6b6b70;
  --card: #f5f5f7;
  --border: #e2e2e6;
  --accent: #0a84ff;
  --accent-fg: #ffffff;
  --maxw: 760px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --fg: #f2f2f7;
    --muted: #9a9aa0;
    --card: #1c1c1e;
    --border: #2c2c2e;
    --accent: #0a84ff;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Hiragino Sans",
    "Noto Sans JP", sans-serif;
  line-height: 1.75;
  font-size: 16px;
}

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

header.site {
  border-bottom: 1px solid var(--border);
  margin-bottom: 32px;
  padding-bottom: 20px;
}

header.site a.home {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
}

header.site a.home:hover { color: var(--accent); }

h1 { font-size: 26px; line-height: 1.35; margin: 12px 0 4px; }
h2 { font-size: 20px; margin: 40px 0 10px; padding-top: 8px; }
h3 { font-size: 16px; margin: 24px 0 6px; }

.lang-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px 12px;
  margin: 8px 0;
}

.updated { color: var(--muted); font-size: 14px; margin-top: 2px; }

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 48px 0;
}

a { color: var(--accent); }

p, li { color: var(--fg); }

ul { padding-left: 22px; }
li { margin: 4px 0; }

.card {
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 20px;
  margin: 14px 0;
  text-decoration: none;
  color: var(--fg);
  transition: border-color .15s ease;
}
.card:hover { border-color: var(--accent); }
.card .title { font-size: 18px; font-weight: 600; margin: 0 0 4px; }
.card .desc { color: var(--muted); font-size: 14px; margin: 0; }
.card .links { margin-top: 10px; font-size: 14px; }
.card .links a { margin-right: 16px; }

.btn {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-fg);
  text-decoration: none;
  font-weight: 600;
  padding: 12px 22px;
  border-radius: 12px;
  margin: 8px 0;
}
.btn:hover { opacity: .9; }

footer.site {
  margin-top: 64px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
}

.note {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 14px;
  color: var(--muted);
}

/* App row: icon + text + App Store link */
.app {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 18px;
  margin: 14px 0;
}
.app img.logo {
  width: 64px;
  height: 64px;
  border-radius: 14px;
  flex: 0 0 auto;
  box-shadow: 0 1px 3px rgba(0,0,0,.15);
}
.app .body { flex: 1 1 auto; min-width: 0; }
.app .title { font-size: 17px; font-weight: 600; margin: 0 0 3px; }
.app .desc { color: var(--muted); font-size: 13px; margin: 0; }

/* App Store badge (text style; swap for official badge image if desired) */
.appstore {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--fg);
  color: var(--bg);
  text-decoration: none;
  font-weight: 600;
  font-size: 13px;
  padding: 9px 14px;
  border-radius: 10px;
  white-space: nowrap;
}
.appstore:hover { opacity: .85; }
.appstore.disabled {
  background: transparent;
  color: var(--muted);
  border: 1px dashed var(--border);
  pointer-events: none;
}

@media (max-width: 520px) {
  .app { flex-wrap: wrap; }
  .app .appstore { margin-left: 80px; }
}