/* ARM Help — one stylesheet, no build step, light and dark. */
:root{
  --bg:#ffffff; --panel:#f7f8fa; --raise:#ffffff; --text:#16191d; --muted:#5d6874;
  --line:#e5e8ec; --line-soft:#eef1f4;
  --accent:#1f6feb; --accent-soft:#eaf1fe; --mark:#fff2b8;
  --shadow:0 1px 2px rgba(16,24,40,.05); --shadow-lift:0 4px 16px rgba(16,24,40,.08);
  --radius:12px; --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
@media (prefers-color-scheme: dark){
  :root{ --bg:#0e1217; --panel:#151a21; --raise:#171d25; --text:#e7ebf0; --muted:#98a4b2;
         --line:#242b35; --line-soft:#1d232b;
         --accent:#6ea8fe; --accent-soft:#16233a; --mark:#4a3f13;
         --shadow:none; --shadow-lift:0 4px 16px rgba(0,0,0,.35); }
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.65 var(--sans);-webkit-font-smoothing:antialiased}
/* Search snippets and step text carry bare ARM urls, which do not wrap on their
   own and push a phone-width page sideways. */
.doc,.res-snip,.res-title,.lede,.howto h2,.side-list,.crumbs{overflow-wrap:anywhere}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{letter-spacing:-.011em}
.skip{position:absolute;left:-9999px}
.skip:focus{left:8px;top:8px;background:var(--panel);padding:8px;z-index:70}

/* header */
.topbar{position:sticky;top:0;z-index:20;display:flex;gap:16px;align-items:center;
  padding:10px 22px;background:color-mix(in srgb,var(--bg) 88%,transparent);
  backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid var(--line)}
.brand{font-weight:600;color:var(--text);white-space:nowrap}
.brand .mark{background:var(--accent);color:#fff;border-radius:6px;padding:2px 6px;margin-right:6px;font-size:13px;letter-spacing:.04em}
.searchbtn{display:flex;align-items:center;gap:8px;flex:1;min-width:0;max-width:460px;cursor:pointer;
  padding:7px 10px;border:1px solid var(--line);border-radius:9px;background:var(--panel);
  color:var(--muted);font:inherit;font-size:14px;text-align:left}
.searchbtn:hover{border-color:var(--accent);color:var(--text)}
.searchbtn .ph{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
/* Lucide draws into <i data-lucide>; the box is reserved either way so nothing
   shifts when the script lands, and every icon is decorative — each one sits
   next to its own label. */
[data-lucide]{display:inline-block;width:1em;height:1em;flex:none;stroke-width:2;vertical-align:-.14em}
svg[data-lucide]{display:inline-block}
.ico{width:16px;height:16px;color:var(--muted)}
.topnav{margin-left:auto;display:flex;gap:16px;font-size:13.5px}
.topnav a{color:var(--muted)}
kbd{font:600 11px/1.7 var(--sans);border:1px solid var(--line);border-bottom-width:2px;border-radius:5px;
  padding:0 5px;color:var(--muted);background:var(--bg)}
.kbd-hint{white-space:nowrap}
mark{background:var(--mark);color:inherit;border-radius:3px;padding:0 2px}

/* ⌘K palette */
/* Hidden by default. The display rule lives on .open, not on .palette, because
   an author `display:flex` on the element itself beats the browser's
   [hidden]{display:none} — which left the modal permanently on screen. */
.palette{display:none;position:fixed;inset:0;z-index:60;justify-content:center;align-items:flex-start;padding:12vh 16px 16px}
.palette.open{display:flex}
.palette[hidden]{display:none}
.palette-backdrop{position:absolute;inset:0;background:rgba(9,13,20,.55);backdrop-filter:blur(2px)}
.palette-box{position:relative;width:min(680px,100%);max-height:70vh;display:flex;flex-direction:column;
  background:var(--bg);border:1px solid var(--line);border-radius:14px;overflow:hidden;
  box-shadow:0 24px 64px rgba(8,12,20,.45);animation:pop .12s ease-out}
@keyframes pop{from{opacity:0;transform:translateY(-6px) scale(.985)}to{opacity:1;transform:none}}
.palette-input{display:flex;align-items:center;gap:10px;padding:14px 16px;border-bottom:1px solid var(--line)}
.palette-input input{flex:1;border:0;outline:0;background:transparent;color:var(--text);font:inherit;font-size:17px}
.palette-input kbd{cursor:pointer}
.palette-results{overflow:auto;padding:6px}
.pgroup{padding:4px 0}
.plabel{font-size:11px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);padding:6px 12px 4px}
.prow{display:flex;gap:10px;align-items:flex-start;padding:9px 12px;border-radius:9px;cursor:pointer}
.prow.sel{background:var(--accent-soft)}
.prow.plain{cursor:default;color:var(--muted);font-size:13px}
.pico{width:16px;height:16px;margin-top:3px;color:var(--muted)}
.pmain{flex:1;min-width:0}
.ptitle{display:block;font-size:14.5px;font-weight:500;color:var(--text)}
.pcrumb{display:block;font-size:12px;color:var(--muted)}
.psnip{display:block;font-size:12.5px;color:var(--muted);margin-top:2px;
  overflow:hidden;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.phint{flex:none;font-size:11px;color:var(--muted);padding-top:3px;white-space:nowrap}
.panswer{padding:14px 16px}
.panswer .doc{max-width:none;font-size:15px}
.panswer figure.shot img{max-height:280px;width:auto}
.palette-foot{display:flex;gap:16px;padding:8px 16px;border-top:1px solid var(--line);
  font-size:11.5px;color:var(--muted)}
@media (max-width:600px){.palette{padding:8vh 8px 8px}.palette-foot{display:none}}

/* layout */
.shell{display:grid;grid-template-columns:262px minmax(0,1fr) 210px;gap:44px;
  max-width:1320px;margin:0 auto;padding:30px 24px 72px}
.shell-wide{grid-template-columns:minmax(0,1fr);max-width:940px}
@media (max-width:1150px){.shell{grid-template-columns:240px minmax(0,1fr);gap:32px} .onthispage{display:none}}
@media (max-width:820px){
  /* 1fr still floors at min-content; minmax(0,1fr) is what lets long steps and
     wide screenshots shrink instead of pushing the page sideways. */
  .shell{grid-template-columns:minmax(0,1fr);gap:0;padding:20px 16px 56px}
  .sidebar{display:none}
  .topbar{padding:10px 14px;gap:10px}
  .topnav{display:none}
  .hero h1{font-size:27px} .page-head h1{font-size:25px}
  .howto{padding:16px 15px}
  .prevnext{flex-direction:column} .pn,.pn.right{max-width:none;text-align:left;margin:0}
  .cards,.screens{grid-template-columns:1fr}
  .ask-form button{width:100%}
}
main{min-width:0}

/* sidebar: one section at a time, never all 92 pages at once */
.sidebar{position:sticky;top:66px;align-self:start;max-height:calc(100vh - 92px);overflow:auto;
  font-size:14px;padding-right:6px}
.back{display:inline-block;color:var(--muted);font-size:13px;margin-bottom:12px}
.side-head{margin-bottom:10px}
.side-title{display:block;font-weight:600;line-height:1.3}
.side-list{list-style:none;margin:0;padding:0}
.side-list a{display:flex;gap:8px;align-items:baseline;padding:6px 10px;border-radius:8px;color:var(--muted);line-height:1.4}
.side-list .s-name{flex:1}
.side-list .s-count{font-size:11px;color:var(--muted);opacity:.7}
.side-list a:hover{background:var(--panel);color:var(--text);text-decoration:none}
.side-list a.active{background:var(--accent-soft);color:var(--accent);font-weight:550}
.side-switch{margin-top:18px;border-top:1px solid var(--line);padding-top:12px;font-size:13.5px}
.side-switch summary{cursor:pointer;color:var(--muted)}
.side-switch ul{list-style:none;margin:8px 0 0;padding:0}
.side-switch li a{display:block;padding:4px 10px;color:var(--muted)}

/* home */
.hero{padding:26px 0 8px}
.hero h1{font-size:34px;margin:0 0 6px}
.lede{font-size:17.5px;color:var(--muted);max-width:64ch;margin:0}
.lede p{margin:.4em 0}
.herosearch{display:flex;align-items:center;gap:10px;width:min(560px,100%);margin:22px 0 4px;
  padding:13px 16px;border:1px solid var(--line);border-radius:11px;background:var(--panel);
  color:var(--muted);font:inherit;font-size:15px;cursor:pointer;text-align:left;box-shadow:var(--shadow)}
.herosearch span{flex:1}
.herosearch [data-lucide]{width:18px;height:18px;color:var(--muted)}
.herosearch:hover{border-color:var(--accent);box-shadow:var(--shadow-lift)}
.sec{font-size:13px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin:34px 0 14px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:12px}
.card{display:flex;gap:14px;align-items:center;padding:16px;border:1px solid var(--line);
  border-radius:var(--radius);background:var(--raise);box-shadow:var(--shadow)}
.card:hover{border-color:var(--accent);box-shadow:var(--shadow-lift);text-decoration:none;transform:translateY(-1px)}
.card{transition:transform .12s ease,box-shadow .12s ease,border-color .12s ease}
.card-ico{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;
  border-radius:10px;background:var(--accent-soft);color:var(--accent);flex:none}
.card-ico [data-lucide]{width:19px;height:19px}
.card-body{flex:1;min-width:0}
.card-title{display:block;font-weight:600;color:var(--text);margin-bottom:2px;line-height:1.35}
.card .meta{color:var(--muted);font-size:13px}
.card-go{width:16px;height:16px;color:var(--muted)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.chip{border:1px solid var(--line);background:var(--panel);color:var(--text);font:inherit;font-size:13px;
  padding:6px 13px;border-radius:99px;cursor:pointer}
.chip:hover{border-color:var(--accent);color:var(--accent)}

/* module contents */
.crumbs{font-size:13px;color:var(--muted);margin-bottom:10px;display:flex;gap:6px;flex-wrap:wrap}
.crumbs a{color:var(--muted)}
.screens{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:10px;margin-top:22px}
.screen-card{display:block;padding:14px 16px;border:1px solid var(--line);border-radius:10px;
  background:var(--raise);box-shadow:var(--shadow)}
.screen-card:hover{border-color:var(--accent);text-decoration:none}
.sc-title{display:block;font-weight:550;color:var(--text);margin-bottom:8px;line-height:1.35}
.sc-meta{display:flex;gap:6px;flex-wrap:wrap}
.pill{display:inline-block;font-size:11.5px;padding:2px 9px;border-radius:99px;
  background:var(--accent-soft);color:var(--accent);white-space:nowrap}
.pill.ghost{background:var(--panel);color:var(--muted);border:1px solid var(--line)}

/* a screen */
.page-head{margin-bottom:26px}
.page-head h1{font-size:31px;margin:0 0 10px}
.page-meta{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:16px}
.btn{display:inline-flex;align-items:center;gap:5px;padding:6px 13px;border-radius:8px;
  background:var(--accent);color:#fff;font-size:13.5px}
.btn [data-lucide]{width:14px;height:14px}
.btn:hover{text-decoration:none;opacity:.92}
.btn.ghost{background:transparent;color:var(--muted);border:1px solid var(--line)}
.btn.ghost:hover{color:var(--accent);border-color:var(--accent)}

.howtos{display:flex;flex-direction:column;gap:14px}
.howto{border:1px solid var(--line);border-radius:var(--radius);background:var(--raise);
  padding:20px 22px;box-shadow:var(--shadow);scroll-margin-top:78px}
.howto:target{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.howto h2{margin:0 0 10px;font-size:18.5px;line-height:1.35}
.howto .summary{color:var(--muted)}
.anchor-link{opacity:0;margin-left:.35em;color:var(--muted);font-weight:400;font-size:.8em}
.howto:hover .anchor-link,.anchored:hover .anchor-link{opacity:1}

.doc{max-width:72ch}
.doc p{margin:.6em 0}
.doc .steps{margin:.2em 0;padding-left:1.35em}
.doc .steps li{margin:.45em 0;padding-left:.15em}
.doc .steps li::marker{color:var(--muted);font-variant-numeric:tabular-nums}
.doc figure.shot{margin:16px 0 0;padding:0;border:1px solid var(--line);border-radius:10px;
  overflow:hidden;background:var(--panel);max-width:100%}
/* A screenshot illustrates a step; it should not be the tallest thing on the
   page. Full detail is one click away in the lightbox. */
.doc figure.shot img{display:block;width:100%;max-height:380px;object-fit:contain;object-position:top;
  background:var(--panel);cursor:zoom-in}
.shots.grid figure.shot img{max-height:190px;object-fit:cover}
.doc figcaption{font-size:12.5px;color:var(--muted);padding:8px 12px;border-top:1px solid var(--line)}
.shots.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px;max-width:none;margin-top:16px}
.shots.grid figure.shot{margin:0}
.gallery{margin-top:34px}
.gallery h2,.related-screens h2{font-size:13px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin:0 0 12px}

.about{margin-top:26px;border:1px solid var(--line);border-radius:10px;background:var(--panel);padding:2px 18px}
.about summary{cursor:pointer;padding:12px 0;font-size:14px;color:var(--muted);font-weight:550}
.about[open] summary{border-bottom:1px solid var(--line);margin-bottom:8px}
.about .doc{padding-bottom:12px}
.related{margin-top:24px;font-size:14px;color:var(--muted)}
.related span{color:var(--muted)}
.related a{margin:0 2px}

.prevnext{display:flex;justify-content:space-between;gap:12px;margin-top:34px;padding-top:18px;border-top:1px solid var(--line)}
.pn .meta{display:flex;align-items:center;gap:5px}
.pn.right .meta{justify-content:flex-end}
.pn .meta [data-lucide]{width:13px;height:13px}
.pn{display:flex;flex-direction:column;gap:2px;padding:12px 16px;border:1px solid var(--line);border-radius:10px;
  background:var(--raise);max-width:46%;color:var(--text);font-size:14.5px}
.pn:hover{border-color:var(--accent);text-decoration:none}
.pn.right{text-align:right;margin-left:auto}

/* on this page */
.onthispage{position:sticky;top:66px;align-self:start;font-size:13px;max-height:calc(100vh - 92px);overflow:auto}
.onthispage h2{font-size:11px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin:0 0 10px}
.onthispage ul{list-style:none;margin:0;padding:0}
.onthispage li a{display:block;padding:5px 0 5px 10px;border-left:2px solid var(--line);color:var(--muted);line-height:1.35}
.onthispage li a:hover{color:var(--text);border-left-color:var(--accent)}

/* search results */
.results{list-style:none;padding:0}
.results li{padding:15px 0;border-bottom:1px solid var(--line)}
.res-title{font-weight:600;margin-right:8px}
.res-crumb{font-size:12px;color:var(--muted);margin-top:2px}
.res-snip{font-size:14px;color:var(--muted);margin-top:5px}

/* ask */
.ask{margin-top:34px;padding:20px;border:1px solid var(--line);border-radius:var(--radius);background:var(--panel)}
.ask h2{margin:0 0 12px;font-size:13px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted)}
.ask-form{display:flex;gap:8px;flex-wrap:wrap}
.ask-form input{flex:1;min-width:220px;padding:11px 13px;border:1px solid var(--line);border-radius:9px;
  background:var(--bg);color:var(--text);font:inherit;font-size:15px}
.ask-form input:focus{outline:2px solid var(--accent-soft);border-color:var(--accent)}
.ask-form button{padding:11px 20px;border:0;border-radius:9px;background:var(--accent);color:#fff;
  font:inherit;font-weight:600;cursor:pointer}
.ask-out{margin-top:16px}
.ask-out .doc{max-width:none}
.cites{margin-top:14px;padding-top:11px;border-top:1px solid var(--line);font-size:12.5px;color:var(--muted);
  display:flex;flex-wrap:wrap;gap:4px 8px;align-items:center}
.cite-lead{color:var(--muted)}
.asked{margin-left:auto;font-size:11px;color:var(--muted);white-space:nowrap}
.badge{display:inline-block;font-size:11px;padding:1px 7px;border-radius:99px;background:var(--accent-soft);color:var(--accent)}
.thinking{color:var(--muted)}

.alsoask{margin-top:34px}
.alsoask h2{font-size:13px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin:0 0 10px}
.alsoask ul{list-style:none;padding:0;margin:0}
.alsoask li{padding:7px 0;display:flex;gap:10px;align-items:baseline;flex-wrap:wrap;border-bottom:1px solid var(--line-soft)}
.linky{border:0;background:none;padding:0;color:var(--accent);font:inherit;font-size:15px;cursor:pointer;text-align:left}
.linky:hover{text-decoration:underline}

/* lightbox */
.lightbox{position:fixed;inset:0;background:rgba(6,10,16,.88);display:flex;align-items:center;justify-content:center;
  z-index:80;padding:24px;cursor:zoom-out}
.lightbox img{max-width:100%;max-height:100%;border-radius:8px;box-shadow:0 20px 60px rgba(0,0,0,.5)}

/* embed */
body.embedded{font-size:15px}
/* The panel is ~420px wide inside ARM: one row, nothing allowed to wrap. */
.embed-head{display:flex;gap:10px;align-items:center;padding:10px 14px;border-bottom:1px solid var(--line);
  position:sticky;top:0;background:var(--bg);z-index:5}
.embed-head strong{white-space:nowrap;font-size:14px}
.embed-head .meta{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.embed-head .search{flex:none}
.embed-head input{width:112px;padding:6px 10px;border:1px solid var(--line);border-radius:8px;
  background:var(--panel);color:var(--text);font:inherit;font-size:13px}
.embed-head input:focus{width:150px;outline:none;border-color:var(--accent)}
.embed-body{padding:16px 18px 40px;max-width:760px}
.embed-body h1{font-size:21px;margin:.2em 0 .4em}
.embed-body .lede{font-size:15px}
.embed-body .howto{padding:14px 16px;margin-top:12px}
.embed-body .howto h2{font-size:16px}
.embed-body .page-meta{margin:14px 0}

.foot{border-top:1px solid var(--line);padding:20px;color:var(--muted);font-size:13px;text-align:center}