:root {
  --bg: #f7f4ef;
  --surface: #ffffff;
  --text: #1f1c19;
  --muted: #615a52;
  --accent: #a8442a;
  --line: #e4ddd3;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #171513;
    --surface: #211e1b;
    --text: #f1ece5;
    --muted: #b6ada2;
    --accent: #f08a68;
    --line: #36312c;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "PingFang TC",
    "Hiragino Sans", "Apple SD Gothic Neo", "Noto Sans CJK SC", sans-serif;
}

a { color: var(--accent); text-underline-offset: 0.18em; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.site-header, main, .site-footer {
  width: min(100% - 32px, 760px);
  margin-inline: auto;
}

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 650;
  font-size: 1.15rem;
  text-decoration: none;
}

.brand img { border-radius: 9px; }

.site-header nav { display: flex; flex-wrap: wrap; gap: 4px 18px; }
.site-header nav a { color: var(--muted); text-decoration: none; padding: 6px 0; }
.site-header nav a[aria-current="page"] { color: var(--text); font-weight: 600; }

main { padding: 32px 0 48px; }

h1 { font-size: clamp(1.9rem, 5vw, 2.6rem); line-height: 1.2; margin: 0 0 16px; }
h2 { font-size: 1.35rem; line-height: 1.3; margin: 40px 0 8px; }
h3 { font-size: 1.1rem; margin: 28px 0 6px; }
p, ul { margin: 0 0 14px; }
ul { padding-left: 1.25em; }
li { margin: 4px 0; }
strong { font-weight: 650; }

.site-footer {
  padding: 24px 0 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.languages { display: flex; flex-wrap: wrap; gap: 6px 16px; margin-bottom: 16px; }
.languages a { color: var(--muted); }
.languages a[aria-current="true"] { color: var(--text); font-weight: 600; text-decoration: none; }