:root {
  --accent: #e8730c;
  --bg: #ffffff;
  --fg: #1c1c1e;
  --muted: #6e6e73;
  --card: #f5f5f7;
  --border: rgba(0, 0, 0, 0.08);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111113;
    --fg: #f2f2f4;
    --muted: #9a9aa0;
    --card: #1d1d20;
    --border: rgba(255, 255, 255, 0.1);
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 0 24px; }
header.site {
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}
header.site .wrap { display: flex; align-items: center; justify-content: space-between; }
.brand { font-weight: 700; font-size: 18px; color: var(--fg); text-decoration: none; letter-spacing: 0.02em; }
.brand span { color: var(--accent); }
nav a { color: var(--muted); text-decoration: none; font-size: 14px; margin-left: 18px; }
nav a:hover { color: var(--fg); }
.hero { padding: 72px 0 48px; text-align: center; }
.hero h1 { font-size: 40px; margin: 0 0 8px; letter-spacing: -0.02em; }
.hero .tagline { color: var(--accent); font-weight: 600; margin: 0 0 16px; }
.hero p.lead { color: var(--muted); font-size: 17px; max-width: 560px; margin: 0 auto 28px; }
.cta {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 13px 28px;
  border-radius: 14px;
  text-decoration: none;
  font-weight: 600;
}
.cta.secondary { background: var(--card); color: var(--fg); border: 1px solid var(--border); }
.cta + .cta { margin-left: 10px; }
.cta-note { margin: 12px 0 0; font-size: 14px; color: var(--muted); }
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
  padding: 24px 0 56px;
}
.feature {
  background: var(--card);
  border-radius: 16px;
  padding: 20px 22px;
}
.feature h3 { margin: 0 0 6px; font-size: 16px; }
.feature p { margin: 0; color: var(--muted); font-size: 14px; }
main.doc { padding: 48px 0 64px; }
main.doc h1 { font-size: 28px; margin: 0 0 4px; }
main.doc .date { color: var(--muted); font-size: 14px; margin-bottom: 32px; }
main.doc h2 { font-size: 19px; margin: 36px 0 10px; }
main.doc h3 { font-size: 16px; margin: 22px 0 8px; }
main.doc p, main.doc li { color: var(--fg); font-size: 15.5px; }
main.doc ul { padding-left: 20px; }
main.doc .en { color: var(--muted); font-size: 14px; }
.faq { background: var(--card); border-radius: 16px; padding: 18px 22px; margin: 14px 0; }
.faq h3 { margin: 0 0 6px; font-size: 16px; }
.faq p { margin: 0; color: var(--muted); font-size: 14.5px; }
footer.site {
  border-top: 1px solid var(--border);
  padding: 28px 0 48px;
  color: var(--muted);
  font-size: 13.5px;
}
footer.site a { color: var(--muted); }