:root {
  --bg: #ffffff;
  --fg: #1c1c1e;
  --muted: #6b6b70;
  --accent: #0a84ff;
  --line: #e5e5ea;
  --maxw: 720px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 32px 20px 64px;
}

header.site {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 20px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

header.site .brand {
  font-weight: 700;
  font-size: 19px;
  text-decoration: none;
  color: var(--fg);
}

header.site nav a {
  color: var(--accent);
  text-decoration: none;
  font-size: 15px;
  margin-left: 16px;
}

header.site nav a:hover { text-decoration: underline; }

h1 {
  font-size: 30px;
  line-height: 1.25;
  margin: 0 0 6px;
}

h2 {
  font-size: 21px;
  margin: 36px 0 10px;
}

.updated {
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 28px;
}

p, ul { margin: 0 0 16px; }

ul { padding-left: 22px; }

li { margin-bottom: 8px; }

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

.note {
  background: #f6f6f8;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
  font-size: 15px;
  color: var(--muted);
}

footer.site {
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

footer.site a { color: var(--muted); }

.hero {
  text-align: center;
  padding: 48px 0 24px;
}

.hero p { color: var(--muted); font-size: 18px; }

.links-row {
  display: flex;
  gap: 18px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 28px;
}

.links-row a {
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 20px;
  color: var(--accent);
}

.lang {
  position: relative;
  display: inline-block;
  margin-left: 16px;
}

.lang summary {
  list-style: none;
  cursor: pointer;
  user-select: none;
  font-size: 17px;
  line-height: 1;
}

.lang summary::-webkit-details-marker { display: none; }

.lang-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 6px;
  min-width: 132px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.14);
  z-index: 10;
}

.lang-menu a {
  display: block;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 15px;
  color: var(--accent);
  text-decoration: none;
}

.lang-menu a:hover { background: var(--line); }

.lang-menu a.current {
  color: var(--muted);
  font-weight: 700;
  pointer-events: none;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --fg: #f2f2f7;
    --muted: #98989f;
    --line: #2c2c2e;
  }
  .note { background: #1c1c1e; }
}