:root { --bg: #f5f7fa; --card: #ffffff; --text: #1c1c1e; --muted: #5f6b7a; --accent: #3d698a; --line: #e3e8ee; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f1418; --card: #182028; --text: #eef1f4; --muted: #9aa7b4; --accent: #8fb6d6; --line: #26313b; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); line-height: 1.65;
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "PingFang TC", "Hiragino Sans", "Segoe UI", sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 32px 16px 64px; }
header { display: flex; align-items: center; gap: 14px; margin-bottom: 8px; }
header img { width: 56px; height: 56px; border-radius: 13px; }
header .name { font-weight: 700; font-size: 20px; }
nav.lang { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0 24px; }
nav.lang button { border: 1px solid var(--line); background: var(--card); color: var(--text); border-radius: 999px;
  padding: 6px 14px; font: inherit; font-size: 14px; cursor: pointer; }
nav.lang button[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }
h1 { font-size: 30px; line-height: 1.25; margin: 8px 0 12px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
section.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 4px 20px 16px; margin: 16px 0; }
p, li { color: var(--text); }
.muted { color: var(--muted); font-size: 15px; }
a { color: var(--accent); }
.contact { font-size: 19px; font-weight: 600; }
footer { margin-top: 40px; color: var(--muted); font-size: 14px; display: flex; gap: 16px; flex-wrap: wrap; }
[data-lang] { display: none; }
[data-lang].on { display: block; }