/* The blog shares the homepage's tokens, type and components (nav, buttons, hairline rows, FAQ, close band, footer),
   so a post reads as another page of the same site. */
:root{
  --ink:#0A0B1E; --muted:#5D6173; --grey:#696D7E; --grey-lg:#7C8091; --line:#E5E7EC; --line-2:#DADDE3;
  --ground:#F4F5F7; --paper:#FFFFFF; --accent:#1438CA; --night:#0A0B1E;
  --display:"Instrument Sans","Geist",system-ui,sans-serif;
  --text:"Geist",system-ui,-apple-system,"Segoe UI",sans-serif;
  --ease:cubic-bezier(.16,1,.3,1);
  --gl:max(20px,env(safe-area-inset-left,0px)); --gr:max(20px,env(safe-area-inset-right,0px));
  --r-lg:16px; --r-sm:10px;
  color-scheme:light;
}
@media (min-width:900px){:root{--gl:max(40px,env(safe-area-inset-left,0px));--gr:max(40px,env(safe-area-inset-right,0px))}}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--paper);color:var(--ink);font:400 16px/1.55 var(--text);-webkit-font-smoothing:antialiased;overflow-x:hidden}
h1,h2,h3,p{margin:0}
p{text-wrap:pretty}
a{color:inherit}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1200px;margin:0 auto;padding-left:var(--gl);padding-right:var(--gr)}
.col{max-width:760px;margin-inline:auto}
[id]{scroll-margin-top:84px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
a:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.close a:focus-visible{outline-color:#fff}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:48px;padding:0 22px;border-radius:var(--r-sm);border:1px solid transparent;font:500 15.5px/1 var(--text);text-decoration:none;white-space:nowrap;cursor:pointer;transition:background .2s,border-color .2s,color .2s,transform .16s var(--ease)}
.btn:active{transform:scale(.97)}
.btn-sm{height:36px;padding:0 16px;font-size:14px}
.btn-white{background:#fff;color:var(--ink)}
.btn-ink{background:var(--ink);color:#fff}
@media (hover:hover) and (pointer:fine){
.btn-white:hover{background:#E9ECF6}
.btn-ink:hover{background:#262A45}
}

/* nav: the homepage's light glass bar, here from the first pixel because the page opens on the same light ground */
.nav{position:sticky;top:0;z-index:50;padding-top:env(safe-area-inset-top,0px);background:rgba(244,245,247,.86);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);box-shadow:0 1px 0 var(--line)}
.nav-in{display:flex;align-items:center;justify-content:space-between;gap:16px;height:60px}
.logo{display:block}
.logo img{height:21px;width:auto}
.links{display:flex;align-items:center;gap:30px;font-size:14.5px}
.links a:not(.btn){color:var(--muted);text-decoration:none;transition:color .2s}
.links a[aria-current]{color:var(--ink)}
@media (hover:hover) and (pointer:fine){.links a:not(.btn):hover{color:var(--ink)}}
@media (max-width:860px){.links{gap:20px}.links a.wide{display:none}.nav .btn-sm{height:44px}}

/* page head: the light ground band the homepage hero sits on */
.phead{background:var(--ground);padding-block:clamp(48px,7vw,96px) clamp(40px,5vw,64px)}
.crumbs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px;font-size:14px;color:var(--grey)}
.crumbs a{text-decoration:none}
.crumbs span[aria-hidden]{color:var(--line-2)}
@media (hover:hover) and (pointer:fine){.crumbs a:hover{color:var(--ink)}}
.phead h1{font:400 clamp(34px,4.4vw,54px)/1.04 var(--display);letter-spacing:-.036em;text-wrap:balance}
.phead .lead{margin-top:22px;font-size:clamp(17.5px,1.5vw,20px);line-height:1.5;color:var(--muted)}
.by{display:flex;align-items:center;gap:12px;margin-top:30px;font-size:14.5px;line-height:1.4}
.by img{width:38px;height:38px;border-radius:50%;object-fit:cover}
.by b{display:block;font-weight:500}
.by b a{text-decoration:none}
.by span{color:var(--grey)}

/* article */
.post{padding-block:clamp(40px,5vw,64px) clamp(72px,9vw,120px)}
.prose{font-size:17px;line-height:1.65;color:var(--muted)}
.prose>*+*{margin-top:20px}
.prose h2{margin-top:clamp(48px,6vw,64px);font:400 clamp(25px,2.6vw,31px)/1.14 var(--display);letter-spacing:-.024em;color:var(--ink);text-wrap:balance}
.prose h3{margin-top:36px;font:500 19px/1.3 var(--display);letter-spacing:-.01em;color:var(--ink)}
.prose h2+*,.prose h3+*{margin-top:14px}
.prose strong{font-weight:500;color:var(--ink)}
.prose a{color:var(--accent);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
.prose ul,.prose ol{padding-left:22px}
.prose li+li{margin-top:8px}
.prose li::marker{color:var(--grey-lg)}
.tldr{padding:24px 26px;border-radius:var(--r-lg);background:var(--ground)}
.tldr h2{margin:0;font:500 14px/1.4 var(--text);letter-spacing:0;color:var(--grey)}
.tldr ul{margin-top:12px;color:var(--ink)}
@media (max-width:640px){.tldr{padding:20px}}

/* comparison table: hairline rows; on a phone each row becomes a labelled stack so nothing scrolls sideways */
.cmp{width:100%;margin-top:28px;border-collapse:collapse;table-layout:fixed;font-size:15px;line-height:1.5}
.cmp th,.cmp td{padding:15px 20px 15px 0;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}
.cmp th:last-child,.cmp td:last-child{padding-right:0}
.cmp thead th{font-weight:500;color:var(--ink);border-bottom-color:var(--line-2)}
.cmp thead th:first-child{width:22%}
.cmp tbody th{font-weight:400;color:var(--grey)}
.cmp td{color:var(--ink)}
.prose .cmp-note{margin-top:12px;font-size:13.5px;line-height:1.5;color:var(--grey)}
/* a table with many columns runs past the text column, centred on it, and stacks earlier than a narrow one */
@media (min-width:901px){
  .cmp-wide{width:min(1040px,100vw - var(--gl) - var(--gr) - 16px);margin-left:50%;transform:translateX(-50%);font-size:14.5px}
  .cmp-wide thead th:first-child{width:15%}
  .cmp-wide tbody th{font-weight:500;color:var(--ink)}
}
.cmp tbody th a{color:inherit}
@media (max-width:900px){
  .cmp-wide thead{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
  .cmp-wide,.cmp-wide tbody,.cmp-wide tr,.cmp-wide th,.cmp-wide td{display:block;width:auto}
  .cmp-wide tbody tr{padding-block:16px;border-bottom:1px solid var(--line)}
  .cmp-wide tbody tr:first-child{border-top:1px solid var(--line-2)}
  .cmp-wide tbody th,.cmp-wide td{padding:0;border:0}
  .cmp-wide tbody th{width:auto;font-weight:500;color:var(--ink)}
  .cmp-wide td{margin-top:10px}
  .cmp-wide td::before{content:attr(data-l);display:block;font-size:13px;color:var(--grey)}
}
@media (max-width:640px){
  .cmp thead{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}
  .cmp,.cmp tbody,.cmp tr,.cmp th,.cmp td{display:block;width:auto}
  .cmp tbody tr{padding-block:16px;border-bottom:1px solid var(--line)}
  .cmp tbody tr:first-child{border-top:1px solid var(--line-2)}
  .cmp tbody th,.cmp td{padding:0;border:0}
  .cmp tbody th{width:auto;font-weight:500;color:var(--ink)}
  .cmp td{margin-top:10px}
  .cmp td::before{content:attr(data-l);display:block;font-size:13px;color:var(--grey)}
}

/* one tool, the same fields every time: hairline rows with the field name on the left, as the homepage's steps */
.facts{margin-top:18px;margin-bottom:0;border-top:1px solid var(--line-2)}
.facts>div{display:grid;grid-template-columns:150px minmax(0,1fr);gap:4px 24px;padding:16px 0;border-bottom:1px solid var(--line)}
.facts dt{padding-top:1px;font-size:14.5px;color:var(--grey)}
.facts dd{margin:0;font-size:16px;line-height:1.6;color:var(--ink)}
.facts dd ul{padding-left:20px}
.facts dd li+li{margin-top:6px}
.facts .pick dt{font-weight:500;color:var(--ink)}
.prose a.src{font-size:13.5px;color:var(--grey);text-decoration-color:var(--line-2);white-space:nowrap}
@media (hover:hover) and (pointer:fine){.prose a.src:hover{color:var(--ink)}}
@media (max-width:640px){.facts>div{grid-template-columns:minmax(0,1fr)}}

/* FAQ: the homepage's rows */
.qs{margin-top:28px;border-top:1px solid var(--line)}
.q{border-bottom:1px solid var(--line)}
.q summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:22px 0;font:400 clamp(17.5px,1.6vw,20px)/1.4 var(--display);letter-spacing:-.01em;color:var(--ink)}
.q summary::-webkit-details-marker{display:none}
.q summary i{position:relative;flex:none;width:18px;height:18px;margin-right:2px;transition:transform .3s var(--ease)}
.q summary i::before,.q summary i::after{content:"";position:absolute;left:0;top:8.5px;width:18px;height:1.5px;background:var(--ink)}
.q summary i::after{transform:rotate(90deg);transition:opacity .2s}
.q[open] summary i{transform:rotate(180deg)}
.q[open] summary i::after{opacity:0}
@media (hover:hover) and (pointer:fine){.q summary:hover i{opacity:.55}}
.q p{margin:0;padding:0 44px 24px 0;font-size:16px;line-height:1.6;color:var(--muted)}
.q[open] p{animation:q-in .2s var(--ease)}
@keyframes q-in{from{opacity:0;transform:translateY(-4px)}}
@keyframes kn-fade{from{opacity:0}to{opacity:1}}
@media (prefers-reduced-motion:reduce){.q[open] p{animation-name:kn-fade}}
@media (max-width:860px){.q p{padding-right:0}}

.sources{margin-top:clamp(48px,6vw,64px);padding-top:28px;border-top:1px solid var(--line-2);font-size:14.5px;line-height:1.55;color:var(--grey)}
.sources h2{margin:0;font:500 14.5px/1.4 var(--text);letter-spacing:0;color:var(--ink)}
.sources p{margin-top:6px}
.sources ol{margin:14px 0 0;padding-left:26px}
.sources li+li{margin-top:6px}
.sources a{color:var(--muted);text-decoration:underline;text-decoration-color:var(--line-2);text-underline-offset:3px;overflow-wrap:anywhere}
@media (hover:hover) and (pointer:fine){.sources a:hover{color:var(--ink)}}
.author-note{margin-top:20px;font-size:14.5px;line-height:1.55;color:var(--grey)}

/* post lists: the blog index and "Keep reading" under a post */
.list-sec{padding-block:clamp(48px,6vw,80px)}
.list-sec+.list-sec{padding-top:0}
.list-h{font:400 clamp(25px,2.6vw,31px)/1.14 var(--display);letter-spacing:-.024em}
.more{margin-top:clamp(56px,7vw,80px)}
.rows{margin-top:22px;border-top:1px solid var(--line-2)}
.row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:6px 32px;align-items:baseline;padding:24px 0;border-bottom:1px solid var(--line);text-decoration:none}
.row h3{font:500 clamp(18px,1.7vw,21px)/1.3 var(--display);letter-spacing:-.012em;transition:color .2s}
.row p{grid-column:1;margin-top:2px;font-size:15.5px;line-height:1.55;color:var(--muted);max-width:640px}
.row small{grid-column:2;grid-row:1;font-size:13.5px;color:var(--grey);white-space:nowrap}
@media (hover:hover) and (pointer:fine){.row:hover h3{color:var(--accent)}}
@media (max-width:640px){.row{grid-template-columns:minmax(0,1fr)}.row small{grid-column:1;grid-row:auto;margin-top:6px}}

/* close band and footer, as on the homepage */
.close{position:relative;background:var(--night) url(../img/roof.jpg) 50% 62%/cover no-repeat;color:#fff;overflow:hidden}
.close::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,11,30,.74) 0%,rgba(10,11,30,.6) 45%,rgba(10,11,30,.76) 100%)}
.close-in{position:relative;display:flex;flex-direction:column;align-items:center;text-align:center;gap:20px;padding-block:clamp(96px,11vw,160px)}
.close h2{font:400 clamp(30px,3.7vw,50px)/1.06 var(--display);letter-spacing:-.032em;text-wrap:balance}
.close p{font-size:17px;color:rgba(255,255,255,.92);max-width:480px}
footer{background:var(--paper)}
.f-in{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.4fr;gap:32px;padding-block:56px 36px}
.f-in img{height:22px;width:auto}
.f-in .tl{margin-top:14px;font-size:15px;color:var(--muted)}
.f-in h3{margin:0 0 12px;font-size:13px;font-weight:500;color:var(--grey)}
.f-in a{display:block;text-decoration:none;font-size:15px;color:var(--muted);padding:3px 0}
@media (hover:hover) and (pointer:fine){.f-in a:hover{color:var(--ink)}}
.f-in .secu{font-size:14px;line-height:1.7;color:var(--muted)}
.f-bot{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;padding-block:20px 40px;border-top:1px solid var(--line);font-size:13px;color:var(--grey)}
.f-bot a{color:inherit;text-decoration:none;margin-left:18px}
@media (max-width:900px){.f-in{grid-template-columns:1.4fr 1fr 1fr}.f-in>div:last-child{grid-column:1/-1}}
@media (max-width:760px){.f-in{grid-template-columns:minmax(0,1fr)}.f-in a{display:flex;align-items:center;min-height:44px;padding:0}.f-in h3{margin-bottom:4px}.f-bot{align-items:center}.f-bot a{display:inline-flex;align-items:center;min-height:44px}}