:root{--bg:#EAF5FF;--card:#fff;--ink:#14213D;--muted:#5B6478;--accent:#FF6A13}
@media (prefers-color-scheme:dark){:root{--bg:#0B1322;--card:#121C2E;--ink:#fff;--muted:#B8C2D6}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 -apple-system,system-ui,"Segoe UI",Roboto,sans-serif}
main{max-width:760px;margin:0 auto;padding:32px 16px 64px}
.card{background:var(--card);border-radius:20px;padding:24px;margin-bottom:16px}
h1{font-size:28px;margin:0 0 4px}h2{font-size:20px;margin:24px 0 8px}.muted{color:var(--muted)}
a{color:var(--accent)}.lang{display:flex;gap:12px;margin-bottom:16px}