:root{color-scheme:light;--ink:#213729;--muted:#536555;--paper:#f7f8f2;--line:#d7dfd1;--brand:#345a3d}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.8 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}a{color:var(--brand);text-underline-offset:.22em}a:hover{text-decoration-thickness:2px}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #80642a;outline-offset:4px}header,footer{max-width:1080px;margin:auto;padding:24px 32px}header{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line);gap:20px}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-size:24px;font-weight:700;letter-spacing:-.04em}.brand img{width:42px;height:42px;border-radius:11px}nav{display:flex;gap:24px;font-size:15px}main{max-width:800px;margin:64px auto 96px;padding:0 32px}h1{font-size:clamp(36px,6vw,60px);line-height:1.2;letter-spacing:-.045em;margin:12px 0 24px;font-weight:650}h2{font-size:25px;line-height:1.4;letter-spacing:-.025em;margin:42px 0 12px}h3{font-size:20px;line-height:1.5;margin:30px 0 8px}p{margin:0 0 20px;overflow-wrap:anywhere}.eyebrow{color:var(--muted);font-size:14px;letter-spacing:.06em}.intro{font-size:21px;line-height:1.7;color:var(--muted)}.languages{display:flex;gap:12px;margin:32px 0}button{font:inherit;cursor:pointer;color:var(--brand);border:1px solid var(--line);background:transparent;border-radius:6px;padding:7px 18px}button[aria-pressed=true]{background:var(--brand);color:white;border-color:var(--brand)}.note{border-left:3px solid var(--brand);padding:12px 20px;margin:28px 0;background:#edf1e7}footer{border-top:1px solid var(--line);color:var(--muted);font-size:14px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}.skip{position:absolute;top:-100px;left:20px}.skip:focus{top:12px;background:white;padding:8px}details{border-bottom:1px solid var(--line);padding:20px 0}details p{margin-top:16px}summary{cursor:pointer;font-weight:600}html[data-lang=zh] [data-language=en],html[data-lang=en] [data-language=zh]{display:none}@media(max-width:560px){header,footer{padding:20px}header{align-items:flex-start;flex-direction:column;gap:14px}nav{gap:20px}main{margin-top:40px;padding:0 22px}.intro{font-size:19px}h2{margin-top:32px}footer{display:block}}