:root {
  --bg: #f5f5f7;
  --card: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --border: #e3e3e8;
  --accent: #c4566f;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --card: #1c1c1e;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --border: #2c2c2e;
    --accent: #e27a92;
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

.wrap { max-width: 720px; margin: 0 auto; padding: 40px 20px 72px; }

header { display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; align-items: center; margin-bottom: 32px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--text); text-decoration: none; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }

details.langs { position: relative; font-size: 14px; }
details.langs summary { cursor: pointer; list-style: none; color: var(--muted); padding: 6px 12px; border: 1px solid var(--border); border-radius: 999px; background: var(--card); }
details.langs summary::-webkit-details-marker { display: none; }
details.langs summary::after { content: " ▾"; }
details.langs ul { position: absolute; inset-inline-end: 0; top: calc(100% + 6px); z-index: 1; margin: 0; padding: 6px; list-style: none; min-width: 180px; max-height: 60vh; overflow-y: auto; background: var(--card); border: 1px solid var(--border); border-radius: 12px; box-shadow: 0 8px 24px rgba(0,0,0,.12); }
details.langs li { margin: 0; }
details.langs a { display: block; padding: 6px 10px; border-radius: 8px; color: var(--text); text-decoration: none; }
details.langs a:hover { background: var(--bg); }
details.langs a[aria-current="page"] { font-weight: 600; color: var(--accent); }

h1 { font-size: clamp(28px, 5vw, 36px); letter-spacing: -0.01em; line-height: 1.2; }
.meta { color: var(--muted); font-size: 14px; margin-top: 8px; }
.note { color: var(--muted); font-size: 14px; margin-top: 12px; }

.summary { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 20px 22px; margin-top: 28px; }
.summary h2 { margin-top: 0; }

.toc { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding-block: 18px; padding-inline: 40px 22px; margin-top: 28px; font-size: 15px; }
.toc a { color: var(--text); text-decoration: none; }
.toc a:hover { color: var(--accent); }

section { margin-top: 36px; scroll-margin-top: 16px; }
h2 { font-size: 20px; margin: 36px 0 10px; line-height: 1.3; }
h3 { font-size: 17px; margin: 20px 0 6px; }
p { margin-top: 10px; }
ul, ol { margin-top: 10px; margin-inline-start: 22px; }
li { margin-top: 6px; }

footer { margin-top: 56px; padding-top: 20px; border-top: 1px solid var(--border); color: var(--muted); font-size: 14px; display: flex; flex-wrap: wrap; gap: 8px 20px; }
footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--text); }