:root { color-scheme: light dark; --ink: #1f2933; --muted: #5b6770; --accent: #1f3a5f; --bg: #f6f2ea; --card: #ffffff; }
@media (prefers-color-scheme: dark) { :root { --ink: #e8e6e1; --muted: #a8b0b6; --accent: #8fb3e0; --bg: #14181d; --card: #1d232a; } }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.8 -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Segoe UI", Roboto, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 40px 20px 64px; }
h1 { color: var(--accent); font-size: 1.8rem; line-height: 1.3; margin: 0 0 .2em; }
h2 { font-size: 1.1rem; margin: 1.6em 0 .3em; }
h3 { font-size: 1rem; margin: 1.4em 0 .2em; }
a { color: var(--accent); }
code { font-size: .9em; }
section { background: var(--card); border-radius: 16px; padding: 8px 24px 24px; margin-top: 24px; overflow-wrap: anywhere; }
.lead { color: var(--muted); margin: 0; }
.app-header { display: flex; gap: 18px; align-items: center; }
.app-header img, .app img { width: 72px; height: 72px; border-radius: 16px; flex: none; }
.langs { margin-top: 16px; font-size: .95rem; }
.app { display: flex; gap: 18px; align-items: center; padding: 20px 24px; }
.app h2 { margin: 0; }
.app p { margin: .2em 0 .4em; color: var(--muted); }
.links a { margin-right: 16px; white-space: nowrap; }
p.button a { display: inline-block; padding: 10px 20px; border-radius: 999px; background: var(--accent); color: var(--card); text-decoration: none; font-weight: 600; }
footer { margin-top: 40px; color: var(--muted); font-size: .9rem; }
@media (max-width: 480px) {
  section, .app { padding-left: 16px; padding-right: 16px; }
  .app { align-items: flex-start; }
  .app img, .app-header img { width: 56px; height: 56px; border-radius: 12px; }
}