:root{--bg:#fff;--tile:#f5f5f7;--ink:#1d1d1f;--soft:#424245;--muted:#6e6e73;--line:#d2d2d7;--blue:#4a6cd8;--blue-ink:#2f52c4;--dark:#000;--dark-ink:#f5f5f7;--dark-muted:#a1a1a6;--dark-blue:#7d97ff;--mark-green:#4fb050;--mark-red:#e1493b;--mark-purple:#9b4fc8;--mark-yellow:#e6d02e;--mark-blue:#4a6cd8;--font:-apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;--gutter:22px;color-scheme:light}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--ink);font-family:var(--font);letter-spacing:-.01em;-webkit-font-smoothing:antialiased;margin:0;font-size:17px;line-height:1.47}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}a{color:inherit;text-decoration:none}h1,h2,h3{text-wrap:balance;margin:0}p{margin:0}img,video{max-width:100%;height:auto;display:block}:focus-visible{outline:2px solid var(--blue);outline-offset:3px;border-radius:6px}.skip{z-index:50;background:var(--ink);color:#fff;border-radius:6px;padding:6px 12px;position:absolute;top:8px;left:-999px}.skip:focus{left:12px}.wrap{max-width:980px;padding-inline:var(--gutter);margin-inline:auto}.wide{max-width:1120px;padding-inline:var(--gutter);margin-inline:auto}.narrow{max-width:692px;padding-inline:var(--gutter);margin-inline:auto}.proto{background:var(--ink);color:var(--dark-ink);text-align:center;padding:7px var(--gutter);font-size:12px}header.top{top:env(safe-area-inset-top,0px);z-index:10;-webkit-backdrop-filter:saturate(180%)blur(20px);background:#ffffffd1;border-bottom:1px solid #00000014;position:sticky}header.top .bar{max-width:1024px;padding:0 var(--gutter);align-items:center;gap:26px;min-height:52px;margin:0 auto;display:flex}.logo{letter-spacing:-.015em;align-items:center;gap:9px;font-size:19px;font-weight:600;display:flex}.logo svg{flex:none;width:24px;height:24px}nav.main{gap:24px;margin-left:auto;font-size:14px;display:flex}nav.main a{color:var(--muted)}nav.main a:hover,nav.main a[aria-current=page]{color:var(--ink)}.top-right{align-items:center;gap:18px;font-size:14px;display:flex}.lang-switch{color:var(--muted)}.lang-switch:hover{color:var(--ink)}@media (width<=760px){header.top .bar{flex-wrap:wrap;row-gap:0;padding-block:8px}nav.main{order:3;gap:20px;width:100%;margin-left:0;padding-block:6px 2px;overflow-x:auto}.top-right{margin-left:auto}}.pill{background:var(--blue);color:#fff;letter-spacing:0;white-space:nowrap;cursor:pointer;border:0;border-radius:980px;padding:7px 15px;font-family:inherit;font-size:14px;font-weight:500;display:inline-block}.pill:hover{background:var(--blue-ink)}.pill.big{padding:12px 24px;font-size:17px}.pill.line{color:var(--blue-ink);box-shadow:inset 0 0 0 1px var(--blue);background:0 0}.pill.line:hover{background:color-mix(in srgb, var(--blue) 8%, transparent)}.pill[aria-disabled=true]{opacity:.4;pointer-events:none}.more{color:var(--blue-ink)}.more:hover{text-decoration:underline}.more:after{content:" ›"}.mark{background:color-mix(in srgb, var(--blue) 20%, transparent);box-shadow:inset 0 -.09em 0 var(--blue);border-radius:.06em;padding:0 .06em}.tile{text-align:center;padding-block:96px}.tile.grey{background:var(--tile)}.tile.dark{background:var(--dark);color:var(--dark-ink)}.tile.dark .sub{color:var(--dark-muted)}.tile.dark .more{color:var(--dark-blue)}.tile h2{letter-spacing:-.03em;font-size:clamp(36px,5.5vw,56px);font-weight:700;line-height:1.07}.sub{max-width:40rem;color:var(--muted);letter-spacing:-.012em;margin:20px auto 0;font-size:clamp(19px,2.2vw,23px);line-height:1.38}.actions{flex-wrap:wrap;justify-content:center;align-items:center;gap:26px;margin-top:32px;font-size:17px;display:flex}.screen{background:#e8e6e3;border:1px solid #0000000f;border-radius:14px;max-width:980px;margin:56px auto 0;overflow:hidden;box-shadow:0 2px 6px #0000000f,0 28px 60px -28px #0000004d}.screen img,.screen video{width:100%}.caption{color:var(--muted);margin-top:16px;font-size:14px}.page-head{text-align:center;padding-block:80px 24px}.page-head h1{letter-spacing:-.035em;font-size:clamp(40px,6vw,64px);font-weight:700;line-height:1.05}.page-head .sub{margin-top:18px}.prose{color:var(--soft)}.prose h2{color:var(--ink);letter-spacing:-.02em;margin:48px 0 12px;font-size:28px;font-weight:700}.prose>h2:first-child{margin-top:0}.prose h3{color:var(--ink);margin:28px 0 8px;font-size:19px;font-weight:600}.prose p+p{margin-top:12px}.prose ul,.prose ol{gap:6px;margin:12px 0;padding-left:22px;display:grid}.prose b{color:var(--ink)}.prose a{color:var(--blue-ink)}.prose a:hover{text-decoration:underline}.prose .todo{background:color-mix(in srgb, var(--mark-yellow) 45%, transparent);color:var(--ink);border-radius:3px;padding:0 4px}.updated{color:var(--muted);margin-top:14px;font-size:14px}.faq{text-align:left}details{border-bottom:1px solid var(--line);padding-block:18px}details:first-of-type{border-top:1px solid var(--line)}summary{cursor:pointer;letter-spacing:-.015em;justify-content:space-between;gap:16px;font-size:19px;font-weight:600;list-style:none;display:flex}summary::-webkit-details-marker{display:none}summary:after{content:"+";color:var(--blue);font-size:24px;font-weight:400;line-height:1}details[open] summary:after{content:"–"}details p{color:var(--soft);max-width:44rem;margin-top:10px}footer.foot{background:var(--tile);color:var(--muted);padding-block:22px 30px;font-size:12px}footer.foot .bar{max-width:1024px;padding:0 var(--gutter);border-top:1px solid var(--line);flex-wrap:wrap;align-items:center;gap:8px 22px;margin:0 auto;padding-top:18px;display:flex}footer.foot a:hover{color:var(--ink);text-decoration:underline}footer.foot .end{margin-left:auto}.edit-toggle{z-index:100;color:#fff;font:500 14px/1 var(--font);cursor:pointer;background:#1d1d1f;border:0;border-radius:980px;padding:10px 16px;position:fixed;bottom:18px;right:18px;box-shadow:0 6px 20px #00000040}.editing .edit-toggle{background:var(--mark-green)}.edit-toast{z-index:100;color:#fff;max-width:min(90vw,560px);font:14px/1.4 var(--font);opacity:0;pointer-events:none;background:#1d1d1f;border-radius:10px;padding:9px 16px;transition:opacity .2s,transform .2s;position:fixed;bottom:22px;left:50%;transform:translate(-50%,12px)}.edit-toast.show{opacity:1;transform:translate(-50%)}.edit-toast.error{background:var(--mark-red)}.editing [data-edit][contenteditable]{outline:1.5px dashed color-mix(in srgb, var(--blue) 60%, transparent);outline-offset:4px;cursor:text;border-radius:4px}.editing [data-edit][contenteditable]:focus{outline:2px solid var(--blue);background:color-mix(in srgb, var(--blue) 6%, transparent)}