:root {
  --paper: #f2ecdd;
  --card: #f8f3e7;
  --ink: #1f1e1c;
  --muted: #5c5a55;
  --accent: #2f5d62;
  --seal: #b5302a;
  --line: #d8cfbd;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1a1917;
    --card: #24221f;
    --ink: #eee7d8;
    --muted: #b3ab9c;
    --accent: #7fb3b8;
    --seal: #e0675e;
    --line: #3d3a35;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.7 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Segoe UI", "Noto Sans SC", sans-serif;
}
main { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
header img { width: 72px; height: 72px; border-radius: 18px; box-shadow: 0 3px 10px rgba(0,0,0,.18); }
h1 { font-size: 28px; line-height: 1.2; margin: 0; letter-spacing: .04em; }
header p { margin: 4px 0 0; color: var(--muted); }
nav.lang { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 24px; }
nav.lang a {
  display: inline-block; padding: 6px 14px; border-radius: 999px;
  border: 1.5px solid var(--line); color: var(--ink); text-decoration: none; background: var(--card);
}
nav.lang a:hover { border-color: var(--accent); }
section { background: var(--card); border: 1.5px solid var(--line); border-radius: 14px; padding: 20px 22px; margin-bottom: 20px; }
h2 { font-size: 21px; margin: 0 0 8px; color: var(--accent); }
h3 { font-size: 17px; margin: 16px 0 4px; }
ul { padding-left: 22px; margin: 8px 0; }
li { margin: 4px 0; }
a { color: var(--accent); }
footer { color: var(--muted); font-size: 14px; text-align: center; margin-top: 32px; }
footer span { color: var(--seal); }