*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","SF Pro Display",
 "Helvetica Neue","PingFang SC","Hiragino Sans GB","Noto Sans CJK SC","Microsoft YaHei",
 "Segoe UI",Roboto,sans-serif;color:#1d1d1f;background:#fff;
 font-size:17px;line-height:1.6;letter-spacing:.004em;
 -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
.wrap{max-width:720px;margin:0 auto;padding:0 22px}
a{color:#0E7C86;text-decoration:none}
a:hover{text-decoration:underline}
h1{font-size:34px;line-height:1.15;letter-spacing:-.01em;font-weight:600;margin:0 0 12px}
h2{font-size:21px;line-height:1.25;letter-spacing:-.005em;font-weight:600;margin:0 0 10px}
h3{font-size:17px;font-weight:600;margin:0 0 6px}
p{margin:0 0 14px}
p:last-child{margin-bottom:0}
ul,ol{margin:0 0 14px;padding-left:22px}
li{margin:0 0 6px}
:lang(ar),:lang(fa),:lang(ur),:lang(he){line-height:1.8}

.masthead{border-bottom:1px solid #d2d2d7;background:rgba(255,255,255,.82);
 backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);
 position:sticky;top:0;z-index:20}
.masthead .wrap{display:flex;align-items:center;justify-content:space-between;height:52px;gap:16px}
.brand{font-weight:600;font-size:17px;color:#1d1d1f}
.brand span{color:#6e6e73;font-weight:400}
.navlinks{display:flex;gap:18px;font-size:13px;flex-wrap:wrap}
.navlinks a{color:#1d1d1f}
.navlinks a[aria-current]{color:#0E7C86;font-weight:600}

main{padding:44px 0 8px}
.eyebrow{font-size:13px;color:#6e6e73;margin:0 0 8px}
.lede{font-size:19px;line-height:1.55;color:#1d1d1f;margin:0 0 8px}
.meta{font-size:13px;color:#6e6e73;margin:0 0 34px}

.toc{background:#f5f5f7;border-radius:18px;padding:20px 22px;margin:0 0 34px}
.toc h2{font-size:13px;font-weight:600;color:#6e6e73;text-transform:uppercase;
 letter-spacing:.06em;margin:0 0 10px}
.toc ol{margin:0;padding-left:18px;font-size:15px}
.toc li{margin:0 0 4px}

section{margin:0 0 30px;scroll-margin-top:70px}
section h2{padding-top:6px}
.callout{background:#f5f5f7;border-radius:18px;padding:22px 24px;
 border-left:4px solid #0E7C86}
.callout h2{color:#0E7C86}

.switch{margin:38px 0 0;background:#f5f5f7;border-radius:18px;padding:18px 22px}
.switch summary{cursor:pointer;font-size:15px;font-weight:600;list-style:none;
 display:flex;align-items:center;justify-content:space-between;gap:12px}
.switch summary::-webkit-details-marker{display:none}
.switch summary::after{content:"+";font-size:20px;color:#6e6e73;font-weight:400}
.switch[open] summary::after{content:"\2013"}
.switch h2{font-size:13px;color:#6e6e73;text-transform:uppercase;letter-spacing:.06em;margin:0}
.langgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));
 gap:2px 18px;margin-top:16px;font-size:14px}
.langgrid a{color:#1d1d1f;padding:5px 0;display:block}
.langgrid a[aria-current]{color:#0E7C86;font-weight:600}

footer{margin-top:56px;padding:34px 0 54px;border-top:1px solid #d2d2d7;
 font-size:13px;color:#6e6e73;background:#f5f5f7}
footer .wrap{display:grid;gap:6px}
footer .row{display:flex;gap:8px;flex-wrap:wrap}
footer .k{color:#6e6e73;min-width:96px}
footer .v{color:#1d1d1f}
.footlinks{display:flex;gap:16px;flex-wrap:wrap;margin-top:14px}
.footlinks a{color:#0E7C86}

@media (max-width:600px){
 body{font-size:16px}
 h1{font-size:28px}
 h2{font-size:19px}
 main{padding:30px 0 8px}
 .wrap{padding:0 18px}
 .navlinks{gap:12px;font-size:12px}
 .masthead .wrap{height:auto;padding:10px 0;flex-direction:column;align-items:flex-start;gap:6px}
 .toc,.callout,.switch{border-radius:14px}
 .langgrid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr))}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}