:root{color-scheme:light;--ink:#171717;--text:#333;--muted:#666;--line:#e6e6e6}
*{box-sizing:border-box}html{scroll-padding-top:28px}body{margin:0;background:#fff;color:var(--text);font:16px/1.9 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}a{color:#333;text-underline-offset:4px;overflow-wrap:anywhere}a:hover{color:#000}a:focus-visible,summary:focus-visible{outline:2px solid #333;outline-offset:4px}.top{max-width:1120px;margin:auto;padding:26px 32px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center}.brand{text-decoration:none;font-size:17px;font-weight:600;color:var(--ink)}.top-note{font-size:13px;color:var(--muted)}.layout{max-width:1120px;margin:0 auto 56px;padding:0 32px;display:grid;grid-template-columns:204px minmax(0,1fr);gap:48px;align-items:start}aside{position:sticky;top:30px;padding-top:46px}aside h2{font-size:14px;color:var(--ink);font-weight:600;margin:0 0 15px}nav a{display:block;text-decoration:none;color:#555;font-size:13px;line-height:1.7;padding:7px 0}nav a:hover{text-decoration:underline;color:#111}.contact{border-top:1px solid var(--line);margin-top:22px;padding-top:18px;font-size:12px;color:var(--muted)}.contact a{display:block;margin-top:5px}.sheet{min-width:0;padding:40px 0 0;background:#fff}h1{margin:0;color:var(--ink);font-size:30px;line-height:1.5;font-weight:650}.meta{display:flex;flex-wrap:wrap;gap:5px 20px;font-size:13px;color:var(--muted);border-bottom:1px solid var(--line);padding:15px 0 24px;margin-bottom:26px}article>p{margin:16px 0;overflow-wrap:anywhere}article h2{font-size:21px;color:var(--ink);line-height:1.6;margin:35px 0 18px;padding-top:22px;border-top:1px solid var(--line);font-weight:650;scroll-margin-top:24px}article h3{font-size:17px;color:var(--ink);line-height:1.7;margin:25px 0 12px;font-weight:600}article ul{padding-left:23px}article li{padding-left:3px;margin:12px 0}article strong{color:#222;font-weight:650}.mobile-toc{display:none}.footer{border-top:1px solid var(--line);margin-top:32px;padding-top:20px;display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:12px}.skip{position:absolute;left:12px;top:-70px;z-index:3;background:#fff;padding:10px}.skip:focus{top:12px}
@media(max-width:850px){.top{padding:22px 24px}.layout{grid-template-columns:minmax(0,1fr);max-width:760px;gap:0;padding:0 24px}aside{display:none}.sheet{padding-top:30px}.mobile-toc{display:block;margin:0 0 25px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:12px 0}.mobile-toc summary{color:#333;font-size:14px;font-weight:600;cursor:pointer}.mobile-toc nav{padding:10px 0 2px}.mobile-toc nav a{padding:5px 0}h1{font-size:28px}}
@media(max-width:480px){body{font-size:15px;line-height:1.9}.top{padding:19px 22px}.brand{font-size:16px}.top-note{font-size:12px}.layout{padding:0 22px;margin-bottom:30px}.sheet{padding-top:28px}h1{font-size:25px;line-height:1.5}.meta{font-size:12px;gap:4px 15px;padding:12px 0 21px;margin-bottom:22px}article h2{font-size:20px;margin-top:30px;padding-top:21px}article h3{font-size:16px;margin-top:23px}.footer{font-size:12px}}
@media print{body{color:#111;font-size:11pt}.top,aside,.mobile-toc,.notice,.skip{display:none}.layout{display:block;max-width:none;margin:0;padding:0}.sheet{padding:0}article h2,article h3{break-after:avoid}a{color:inherit;text-decoration:none}.footer{margin-top:20px}}

.language-switch{display:flex;align-items:center;gap:4px;flex-shrink:0}.language-switch a{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:7px 13px;border:1px solid transparent;border-radius:3px;color:#555;text-decoration:none;font-size:13px;font-weight:400;line-height:1.4}.language-switch a:hover{background:#f6f6f6;color:#111;text-decoration:none}.language-switch a[aria-current="page"]{border-color:#d3d3d3;color:#111;font-weight:600}.top{gap:15px}.footer{align-items:center}.footer-links{display:flex;align-items:center;gap:16px}.footer .language-switch a{font-size:12px;min-height:40px;padding:6px 10px}html[lang="en"] article{line-height:1.8}html[lang="en"] h1{font-size:29px;line-height:1.4}html[lang="en"] nav a{overflow-wrap:anywhere}@media(max-width:480px){.language-switch a{padding:7px 11px;font-size:13px}.top{padding-top:14px;padding-bottom:14px}.footer{align-items:flex-start;flex-direction:column;gap:12px}.footer-links{width:100%;justify-content:space-between}html[lang="en"] h1{font-size:25px}html[lang="en"] article h2{font-size:19px}}@media print{.language-switch{display:none}}