:root {
  --bg: #FFFFFF;
  --bg-alt: #F5F5F7;
  --ink: #1D1D1F;
  --ink-soft: #6E6E73;
  --accent: #A6192E;
  --line: #D2D2D7;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #000000;
    --bg-alt: #1C1C1E;
    --ink: #F5F5F7;
    --ink-soft: #98989D;
    --accent: #E28A96;
    --line: #38383A;
  }
}

:root[data-theme="dark"] {
  --bg: #000000;
  --bg-alt: #1C1C1E;
  --ink: #F5F5F7;
  --ink-soft: #98989D;
  --accent: #E28A96;
  --line: #38383A;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Segoe UI', Roboto, sans-serif;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: calc(env(safe-area-inset-bottom, 0px) + 32px);
  display: flex;
  justify-content: center;
}

.page {
  width: 100%;
  max-width: 640px;
  padding: 32px 24px 24px;
}

.back {
  display: inline-block;
  font-size: 15px;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  margin-bottom: 24px;
}

.back:hover { text-decoration: underline; }

h1 {
  font-weight: 700;
  font-size: clamp(28px, 7vw, 36px);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0 0 6px;
}

.updated {
  font-size: 13px;
  color: var(--ink-soft);
  margin: 0 0 28px;
}

h2 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 28px 0 8px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

p, li {
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
}

p { margin: 0 0 12px; }

ul { margin: 0 0 12px; padding-left: 20px; }

ul.data {
  list-style: none;
  padding: 16px 18px;
  background: var(--bg-alt);
  border-radius: 14px;
}

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

.ph {
  background: #FFE500;
  color: #000;
  font-weight: 700;
  padding: 0 4px;
  border-radius: 3px;
}

.site-footer {
  margin-top: 36px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: var(--ink-soft);
  line-height: 1.8;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0 6px;
}

.site-footer a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 2px;
}