:root{
  --bg:#f5f6fa; --bg2:#ffffff; --ink:#15171c; --ink2:#454a55; --muted:#5d6370; --line:rgba(20,24,40,.09);
  --card:#ffffff; --card-line:rgba(20,24,40,.07); --accent:#0058b8; --accent2:#0066d6; --accent-ink:#fff; --accent-soft:rgba(10,124,245,.1); --link:#0058b8;
  --good:#28c840; --warn:#febc2e; --bad:#ff5f57;
  --shadow:0 30px 60px -20px rgba(24,32,70,.22),0 12px 24px -12px rgba(24,32,70,.14);
  --r:20px; --max:1080px;
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;
  --display:-apple-system,BlinkMacSystemFont,"SF Pro Display","Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#0d0f16; --bg2:#141722; --ink:#f3f4f8; --ink2:#c3c7d2; --muted:#8d93a3; --line:rgba(255,255,255,.08);
    --card:#171a25; --card-line:rgba(255,255,255,.07); --accent:#4da2ff; --accent2:#3a9bff; --accent-soft:rgba(58,155,255,.14); --link:#6cb4ff;
    --shadow:0 30px 70px -20px rgba(0,0,0,.7),0 12px 30px -12px rgba(0,0,0,.5);
  }
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}*{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important}}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.6 var(--font);-webkit-font-smoothing:antialiased;overflow-x:hidden}
img,svg{max-width:100%;height:auto;display:block}
a{color:var(--link);text-decoration:none}
.content p a,.content li a,.content td a,figcaption a,.note a{text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:2px;text-decoration-color:color-mix(in srgb,var(--link) 45%,transparent)}
a:hover{text-decoration:underline}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
h1,h2,h3,h4{font-family:var(--display);letter-spacing:-.02em;line-height:1.12;margin:0 0 .5em}
h1{font-size:clamp(32px,5vw,50px);font-weight:750}
h2{font-size:clamp(24px,3.4vw,34px);font-weight:700;margin-top:2.2em}
h3{font-size:20px;font-weight:650;margin-top:1.6em}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.3em}
li{margin-bottom:.4em}
.eyebrow{font-size:14px;font-weight:650;color:var(--accent2);letter-spacing:.02em;text-transform:uppercase;margin-bottom:14px}
.lede{font-size:clamp(17px,2vw,20px);color:var(--ink2);line-height:1.55}
.muted{color:var(--muted)}
:focus-visible{outline:3px solid color-mix(in srgb,var(--accent2) 55%,transparent);outline-offset:3px;border-radius:8px}

/* nav */
.skip{position:absolute;left:-999px;top:8px;z-index:99;background:var(--card);padding:8px 12px;border-radius:8px}
.skip:focus{left:12px}
.nav{position:sticky;top:0;z-index:30;backdrop-filter:saturate(1.6) blur(18px);-webkit-backdrop-filter:saturate(1.6) blur(18px);background:color-mix(in srgb,var(--bg) 82%,transparent);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;gap:18px;height:60px}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;color:var(--ink);font-size:16px;white-space:nowrap}
.brand:hover{text-decoration:none}
.brand .dot{width:26px;height:26px;border-radius:7px;background:linear-gradient(160deg,var(--accent2),var(--accent));flex:none;display:grid;place-items:center}
.nav-links{margin-left:auto;display:none;gap:18px;align-items:center;font-size:14.5px}
.nav-links a{color:var(--ink2);white-space:nowrap;position:relative}
.nav-links a[aria-current=page]{color:var(--ink);font-weight:650}
.nav-links a[aria-current=page]::after{content:"";position:absolute;left:0;right:0;bottom:-19px;height:2px;border-radius:2px;background:var(--accent2)}
@media (min-width:1000px){.nav-links{display:flex}.menu{display:none}}
.menu{margin:0 0 0 auto;position:relative;border:0;padding:0;background:none;border-radius:0}
.menu summary::after,.menu[open] summary::after{content:none;display:none}
.menu summary{list-style:none;cursor:pointer;width:42px;height:42px;border-radius:12px;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:4px;border:1px solid var(--card-line);background:var(--card)}
.menu summary::-webkit-details-marker{display:none}
.menu summary span{width:18px;height:2px;border-radius:2px;background:var(--ink);transition:transform .2s ease,opacity .2s ease}
.menu[open] summary span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.menu[open] summary span:nth-child(2){opacity:0}
.menu[open] summary span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.menu-panel{position:absolute;right:0;top:52px;width:min(320px,calc(100vw - 32px));background:var(--card);border:1px solid var(--card-line);border-radius:16px;box-shadow:var(--shadow);padding:8px;display:flex;flex-direction:column;animation:drop .18s ease}
.menu-panel a{padding:11px 12px;border-radius:10px;color:var(--ink);font-size:15.5px}
.menu-panel a:hover,.menu-panel a[aria-current=page]{background:var(--accent-soft);text-decoration:none}
@keyframes drop{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;text-align:center;white-space:nowrap;border:0;border-radius:13px;padding:13px 20px;font:650 16px/1 var(--font);cursor:pointer;background:linear-gradient(160deg,var(--accent2),var(--accent));color:#fff;text-decoration:none;transition:transform .15s ease,box-shadow .2s ease;box-shadow:0 10px 24px -10px color-mix(in srgb,var(--accent2) 65%,transparent)}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn:active{transform:translateY(1px) scale(.99)}
.btn.small{padding:9px 14px;font-size:14px;border-radius:10px}
.btn.ghost{background:var(--accent-soft);color:var(--accent2);box-shadow:none}

/* hero */
.hero{padding:34px 0 8px;max-width:820px}
.hero .lede{margin-top:16px;max-width:42em}
.hero .meta{margin-top:18px;display:flex;flex-wrap:wrap;gap:10px 18px;font-size:14px;color:var(--muted)}

/* breadcrumb */
.crumbs{font-size:13.5px;color:var(--muted);padding:16px 20px 0}
.crumbs a{color:var(--muted)}

/* article layout */
.article{padding:8px 0 60px}
.article-grid{display:grid;gap:40px}
@media (min-width:900px){.article-grid{grid-template-columns:minmax(0,1fr) 240px}}
.content{min-width:0}
.content > * + h2:first-of-type{margin-top:1em}

/* toc */
.toc{position:sticky;top:80px;align-self:start;background:var(--card);border:1px solid var(--card-line);border-radius:var(--r);padding:18px 20px;box-shadow:var(--shadow)}
.toc-h{font-weight:700;margin:0 0 10px;font-size:13px;text-transform:uppercase;letter-spacing:.03em;color:var(--muted)}
.toc ol{list-style:none;margin:0;padding:0;counter-reset:toc}
.toc li{margin-bottom:8px;font-size:14px}
.toc a{color:var(--ink2)}
.toc a:hover{color:var(--accent2)}

/* cards */
.card{background:var(--card);border:1px solid var(--card-line);border-radius:var(--r);padding:clamp(20px,3vw,30px);box-shadow:var(--shadow)}
.grid2{display:grid;gap:20px}
@media (min-width:700px){.grid2{grid-template-columns:1fr 1fr}}
.grid3{display:grid;gap:18px}
@media (min-width:760px){.grid3{grid-template-columns:repeat(3,1fr)}}

/* traffic dots */
.dots{display:inline-flex;gap:6px;margin-bottom:10px}
.dots span{width:11px;height:11px;border-radius:50%;display:inline-block}
.dots .r{background:var(--bad)} .dots .y{background:var(--warn)} .dots .g{background:var(--good)}

/* keyboard keys */
kbd{white-space:nowrap;font-family:var(--mono);font-size:.86em;background:var(--card);border:1px solid var(--card-line);border-bottom-width:2px;border-radius:6px;padding:2px 7px;color:var(--ink);box-shadow:0 1px 0 var(--card-line)}

/* shortcut table */
table{width:100%;border-collapse:collapse;margin:1em 0 1.6em;font-size:15.5px}
th,td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line)}
th{color:var(--muted);font-weight:600;font-size:13px;text-transform:uppercase;letter-spacing:.02em}
tr:last-child td{border-bottom:none}
.table-wrap{overflow-x:auto;border:1px solid var(--card-line);border-radius:16px;background:var(--card)}
.table-wrap table{margin:0}
@media (max-width:640px){.table-wrap table{min-width:560px}}
.table-wrap th,.table-wrap td{padding:13px 16px}

/* callout / CTA */
.callout{margin:2em 0;padding:22px 24px;border-radius:16px;border:1px solid var(--card-line);background:var(--card)}
.callout.cta{background:linear-gradient(155deg,color-mix(in srgb,var(--accent2) 10%,var(--card)),var(--card));border-color:color-mix(in srgb,var(--accent2) 25%,var(--card-line))}
.callout h4{margin:0 0 6px;font-size:16px}
.callout p{margin:0 0 12px;color:var(--ink2)}
.callout .btn{margin-top:2px}

/* steps */
.steps{counter-reset:step;list-style:none;padding:0;margin:1.4em 0}
.steps li{position:relative;padding:0 0 20px 46px;margin:0;border-left:2px solid var(--line)}
.steps li:last-child{border-color:transparent;padding-bottom:0}
.steps li::before{counter-increment:step;content:counter(step);position:absolute;left:-17px;top:0;width:34px;height:34px;border-radius:50%;background:linear-gradient(160deg,var(--accent2),var(--accent));color:#fff;font-weight:700;font-size:14.5px;display:flex;align-items:center;justify-content:center}
.steps strong{display:block;margin-bottom:3px}

/* faq */
details{border:1px solid var(--card-line);border-radius:14px;padding:16px 18px;margin-bottom:10px;background:var(--card)}
summary{font-weight:650;cursor:pointer;list-style:none}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";float:right;color:var(--accent2);font-weight:700}
details[open] summary::after{content:"\2212"}
details p{margin-top:10px;color:var(--ink2)}

/* related */
.related{display:grid;gap:16px;margin-top:1.4em}
@media (min-width:700px){.related{grid-template-columns:1fr 1fr}}
.related a{display:block;padding:16px 18px;border:1px solid var(--card-line);border-radius:14px;background:var(--card);color:var(--ink)}
.related a:hover{text-decoration:none;border-color:color-mix(in srgb,var(--accent2) 40%,var(--card-line))}
.related .k{font-size:12.5px;color:var(--accent2);font-weight:650;text-transform:uppercase;letter-spacing:.02em;display:block;margin-bottom:4px}

/* footer */
footer{border-top:1px solid var(--line);padding:40px 0;margin-top:60px;font-size:14px;color:var(--muted)}
footer .wrap{display:flex;flex-wrap:wrap;gap:24px 40px;justify-content:space-between}
footer a{color:var(--muted)}
footer .flinks{display:flex;gap:18px;flex-wrap:wrap}

/* reveal */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .5s ease,transform .5s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion: reduce){.reveal{opacity:1;transform:none;transition:none}}

/* diagram svg */
.diagram{padding:22px;background:var(--card);border:1px solid var(--card-line);border-radius:var(--r);box-shadow:var(--shadow)}
.diagram figcaption{margin-top:10px;font-size:13.5px;color:var(--muted);text-align:center}

/* byline */
.byline{display:flex;align-items:center;gap:12px;margin-top:20px;font-size:14px;color:var(--muted)}
.byline picture{flex:none}
.byline img{width:40px;height:40px;border-radius:50%;box-shadow:0 0 0 2px var(--card),0 0 0 3px var(--card-line)}
.byline div{display:flex;flex-wrap:wrap;gap:2px 8px}
.byline a{color:var(--ink);font-weight:600}

/* quick answer */
.answer{position:relative;margin:4px 0 8px;padding:20px 22px 8px;border-radius:18px;background:linear-gradient(150deg,color-mix(in srgb,var(--accent2) 12%,var(--card)),var(--card) 70%);border:1px solid color-mix(in srgb,var(--accent2) 30%,var(--card-line));box-shadow:var(--shadow)}
.answer-k{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--accent2);margin-bottom:8px}
.answer p{font-size:17.5px}
.answer ol,.answer ul{margin-top:-4px}

/* screenshots */
.shot{margin:1.6em 0}
.shot a{display:block;cursor:zoom-in}
.shot img{width:100%;border-radius:16px;background:#e8effc}
.shot figcaption,.yt figcaption,.term figcaption{margin-top:10px;font-size:14px;color:var(--muted);line-height:1.5}
@media (prefers-color-scheme: dark){.shot img{filter:brightness(.93)}}

/* video facade */
.yt{margin:1.6em 0}
.yt-btn{position:relative;display:block;width:100%;aspect-ratio:16/9;padding:0;border:0;border-radius:16px;overflow:hidden;cursor:pointer;background:#000;box-shadow:var(--shadow)}
.yt-btn img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease,filter .3s ease}
.yt-btn:hover img{transform:scale(1.03);filter:brightness(.85)}
.yt-play{position:absolute;inset:0;display:grid;place-items:center;transition:transform .2s ease}
.yt-btn:hover .yt-play{transform:scale(1.08)}
.yt-dur{position:absolute;right:10px;bottom:10px;background:rgba(0,0,0,.78);color:#fff;font:600 12.5px/1 var(--font);padding:5px 7px;border-radius:6px}
.yt-frame{display:block;width:100%;aspect-ratio:16/9;border:0;border-radius:16px}
.videos{display:grid;gap:20px}
@media (min-width:700px){.videos{grid-template-columns:1fr 1fr}.videos .yt{margin:0}}

/* terminal */
.term{margin:1.4em 0;border-radius:14px;overflow:hidden;background:#0f1320;border:1px solid rgba(255,255,255,.06);box-shadow:var(--shadow)}
.term-bar{display:flex;align-items:center;gap:6px;padding:9px 12px;background:#1a1f2e;color:#8d93a3;font-size:12px}
.term-bar i{width:10px;height:10px;border-radius:50%;background:#ff5f57}
.term-bar i:nth-child(2){background:#febc2e}.term-bar i:nth-child(3){background:#28c840}
.term-bar span{margin-left:8px}
.term .copy{margin-left:auto;background:rgba(255,255,255,.08);color:#dfe3ec;border:0;border-radius:7px;padding:4px 10px;font:600 12px var(--font);cursor:pointer}
.term .copy:hover{background:rgba(255,255,255,.16)}
.term pre{margin:0;padding:14px 16px;overflow-x:auto;font:13.5px/1.55 var(--mono);color:#e6e9f2}
.term .prompt{color:#28c840}
.term .out{color:#9aa3b8}
.term figcaption{padding:0 16px 12px;margin:0;color:#9aa3b8}
code{font-family:var(--mono);font-size:.9em;background:var(--accent-soft);padding:1px 6px;border-radius:6px}
.term code{background:none;padding:0;font-size:inherit}

/* quote */
.quote{margin:1.6em 0;padding:18px 22px;border-left:4px solid var(--accent2);background:var(--card);border-radius:0 14px 14px 0}
.quote p{font-size:17px;margin:0 0 8px;color:var(--ink)}
.quote footer{font-size:14px;color:var(--muted);border:0;padding:0;margin:0}

/* author */
.author{display:flex;gap:20px;align-items:flex-start;margin:3em 0 1em;padding:24px;border-radius:var(--r);background:var(--card);border:1px solid var(--card-line);box-shadow:var(--shadow)}
.author picture{flex:none;width:96px}
.author img{width:96px;height:96px;border-radius:50%}
.author-k{font-size:12.5px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--accent2)}
.author-h{font:700 22px/1.2 var(--display);margin:4px 0 8px}
.author p{font-size:15.5px;color:var(--ink2)}
.author-links{display:flex;gap:16px;margin:0}
@media (max-width:560px){.author{flex-direction:column}.author picture{width:72px}.author img{width:72px;height:72px}}

/* sources */
.sources ol{font-size:14.5px;color:var(--muted);padding-left:1.4em}
.sources a{word-break:break-word}

/* faq tweaks */
details summary .q{display:inline;font:650 17px/1.4 var(--font);margin:0;letter-spacing:0}
details .a p{margin:10px 0 2px;color:var(--ink2)}

/* related */
.related a{position:relative;padding-right:40px;transition:transform .2s ease,border-color .2s ease}
.related a:hover{transform:translateY(-2px)}
.related .arr{position:absolute;right:16px;top:50%;transform:translateY(-50%);color:var(--accent2);transition:transform .2s ease}
.related a:hover .arr{transform:translate(4px,-50%)}

/* cta */
.callout.cta{display:flex;gap:16px;align-items:flex-start}
.cta-mark{flex:none;border-radius:11px;box-shadow:0 8px 18px -8px rgba(10,124,245,.6)}
.cta-h{margin:0 0 6px;font-size:18px}

/* compare cards */
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 1em}
.chip{font-size:13px;font-weight:600;padding:5px 10px;border-radius:999px;background:var(--accent-soft);color:var(--accent2)}
.tick{color:#167a2c;font-weight:700}.cross{color:#c4281c;font-weight:700}
@media (prefers-color-scheme: dark){.tick{color:#4ade80}.cross{color:#ff8a80}}
.note{font-size:15px;color:var(--ink2);padding:14px 16px;border-radius:12px;background:color-mix(in srgb,var(--warn) 14%,var(--card));border:1px solid color-mix(in srgb,var(--warn) 35%,var(--card-line))}

/* footer */
footer .wrap{align-items:flex-start}
footer .fcol{display:flex;flex-direction:column;gap:8px;max-width:360px}
footer .fcol p{margin:0}
footer strong{color:var(--ink)}

/* 404 */
.notfound{min-height:60vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:60px 20px}

/* diagram motion (only when motion is allowed) */
@media (prefers-reduced-motion: no-preference){
  .diagram.in .flow-path{stroke-dasharray:6 6;animation:dash 1.4s linear infinite}
  .diagram.in .pulse{animation:pulse 2.4s ease-in-out infinite;transform-origin:center;transform-box:fill-box}
}
@keyframes dash{to{stroke-dashoffset:-24}}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.45}}