:root {
  --bg: #000;
  --line: rgba(255, 255, 255, 0.1);
  --text: #f5f5f7;
  --body: #c7c7cc;
  --muted: #86868b;
  --accent: #c9a96e;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--body);
  font-family: var(--font); font-size: 17px; line-height: 1.65; letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
.wrap {
  max-width: 720px; margin: 0 auto;
  padding-left: max(24px, env(safe-area-inset-left));
  padding-right: max(24px, env(safe-area-inset-right));
}

.top {
  position: sticky; top: 0; z-index: 5;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--line);
}
.top .wrap { display: flex; align-items: center; justify-content: space-between; height: 52px; }
.logo { display: flex; align-items: center; gap: 8px; color: var(--text); text-decoration: none;
  font-size: 19px; font-weight: 600; letter-spacing: -0.02em; }
.logo svg { width: 20px; height: 20px; }
.back { font-size: 13px; font-weight: 500; color: var(--text); text-decoration: none;
  background: rgba(255, 255, 255, 0.1); padding: 8px 16px; border-radius: 999px; }
.back:hover { background: rgba(255, 255, 255, 0.18); }

main { padding: 72px 0 96px; }
h1 { color: var(--text); font-size: clamp(36px, 6vw, 56px); line-height: 1.05; letter-spacing: -0.035em; margin: 0; }
.updated { color: var(--muted); margin: 14px 0 0; font-size: 15px; }
.summary {
  margin: 40px 0 8px; padding: 24px 26px; border-radius: 20px;
  background: #111113; border: 1px solid rgba(255, 255, 255, 0.06); color: var(--text);
}
.summary p { margin: 0; }
h2 { color: var(--text); font-size: 22px; letter-spacing: -0.02em; margin: 48px 0 10px; }
p, li { margin: 0 0 14px; }
ul { padding-left: 22px; margin: 0 0 14px; }
strong { color: var(--text); font-weight: 600; }
code { font-size: 15px; background: rgba(255, 255, 255, 0.08); padding: 1px 6px; border-radius: 6px; color: var(--text); }

footer { border-top: 1px solid var(--line); padding: 28px 0 calc(28px + env(safe-area-inset-bottom)); font-size: 12px; color: var(--muted); }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px 20px; }
footer a { color: var(--muted); text-decoration: none; margin-left: 20px; }
footer a:first-child { margin-left: 0; }
footer a:hover { color: var(--text); }

@media (max-width: 480px) {
  .wrap { padding-left: max(20px, env(safe-area-inset-left)); padding-right: max(20px, env(safe-area-inset-right)); }
  body { font-size: 16px; }
  main { padding: 48px 0 72px; }
  footer .wrap { flex-direction: column; }
}