@font-face{font-family:"Plex Cond";font-weight:600;font-style:normal;font-display:swap;src:url(/fonts/ibm-plex-sans-condensed-latin-600-normal.woff2) format("woff2")}
@font-face{font-family:"Plex Cond";font-weight:700;font-style:normal;font-display:swap;src:url(/fonts/ibm-plex-sans-condensed-latin-700-normal.woff2) format("woff2")}
@font-face{font-family:"Plex Sans";font-weight:400;font-style:normal;font-display:swap;src:url(/fonts/ibm-plex-sans-latin-400-normal.woff2) format("woff2")}
@font-face{font-family:"Plex Sans";font-weight:600;font-style:normal;font-display:swap;src:url(/fonts/ibm-plex-sans-latin-600-normal.woff2) format("woff2")}
@font-face{font-family:"Plex Mono";font-weight:500;font-style:normal;font-display:swap;src:url(/fonts/ibm-plex-mono-latin-500-normal.woff2) format("woff2")}
:root{--bg:#e9edf1;--sheet:#f7f9fb;--ink:#0e1620;--mute:#46566a;--rule:#bcc7d2;--band:#0e1620;--band2:#18242f;--onband:#e8eef4;--onband-mute:#9fb0c1;--amber:#ffb21e;--cond:"Plex Cond","Arial Narrow","Liberation Sans Narrow",system-ui,sans-serif;--sans:"Plex Sans",system-ui,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;--mono:"Plex Mono",ui-monospace,"SF Mono",Menlo,Consolas,monospace}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#0a1016;--sheet:#111a23;--ink:#e6ecf2;--mute:#9db0c2;--rule:#27353f;--band:#05090d;--band2:#101a22}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;background:var(--bg)}
body{margin:0;background:var(--bg);color:var(--ink);font:400 17px/1.62 var(--sans)}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
a{color:var(--ink);text-decoration:underline;text-decoration-color:var(--amber);text-decoration-thickness:2px;text-underline-offset:3px}
a:hover{background:color-mix(in srgb,var(--amber) 35%,transparent)}
a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--ink);outline-offset:2px;box-shadow:0 0 0 6px var(--amber)}
.top{background:var(--band);color:var(--onband);border-bottom:3px solid var(--amber)}
.top a,.foot a{color:var(--onband)}
.hdr{display:flex;align-items:center;justify-content:space-between;gap:8px 24px;flex-wrap:wrap;padding-top:6px;padding-bottom:6px}
.brand{display:inline-flex;align-items:center;gap:12px;font:700 1.3rem/1 var(--cond);letter-spacing:.01em;text-decoration:none;padding:10px 0;min-height:44px}
.brand:hover{background:none}
.bays{width:34px;height:26px;flex:none}
nav{display:flex;gap:0 22px}
nav a{font:600 1.02rem/1 var(--cond);text-decoration:none;display:inline-flex;align-items:center;min-height:44px;border-bottom:3px solid transparent;padding-top:3px}
nav a:hover{background:none;border-bottom-color:var(--amber)}
nav a[aria-current]{border-bottom-color:var(--amber)}
h1,h2,h3{font-family:var(--cond);font-weight:700;margin:0}
h1{font-size:clamp(2.15rem,6.4vw,3.5rem);line-height:1.02;letter-spacing:-.012em;text-wrap:balance}
h2{font-size:1.65rem;line-height:1.12;margin:44px 0 12px;scroll-margin-top:16px}
h3{font-size:1.2rem;margin:24px 0 4px}
p,ul,ol{max-width:68ch}
li{margin:6px 0}
.lede{font-size:1.18rem;line-height:1.5;max-width:58ch}
.num,.spec dd,.tool input,.tool output,.tag{font-family:var(--mono);font-variant-numeric:tabular-nums}
/* page header: the sheet title block */
.sheet-head{background:var(--sheet);border:1px solid var(--rule);border-left:10px solid var(--amber);padding:26px 26px 0;margin:30px 0 0}
.sheet-head .lede{margin:14px 0 22px}
.spec{display:grid;grid-template-columns:repeat(3,auto);justify-content:start;margin:0 -26px;border-top:1px solid var(--rule)}
.spec>div{padding:11px 26px;border-right:1px solid var(--rule)}
.spec>div:last-child{border-right:0}
.spec dt{font-size:.85rem;color:var(--mute);margin:0}
.spec dd{margin:0;font-size:.92rem;font-weight:500}
/* page body: contents rail + column */
.layout{display:grid;grid-template-columns:230px minmax(0,1fr);gap:0 52px;align-items:start;padding-bottom:64px}
.rail{position:sticky;top:18px;padding-top:34px;font-size:.95rem}
.rail h2{font:700 1.05rem/1.2 var(--cond);margin:0 0 6px;padding:0;border:0}
.rail ol,.rail ul{list-style:none;margin:0 0 24px;padding:0;border-left:2px solid var(--rule)}
.rail li{margin:0}
.rail a{display:block;padding:6px 0 6px 14px;margin-left:-2px;border-left:2px solid transparent;text-decoration:none;line-height:1.3}
.rail a:hover{background:none;border-left-color:var(--amber)}
.rail a[aria-current]{border-left-color:var(--amber);font-weight:600}
.rail details{display:none}
article{min-width:0;padding-top:4px}
article>h2:first-child{margin-top:34px}
.note{background:var(--sheet);border:1px solid var(--rule);border-left:5px solid var(--ink);padding:11px 15px;max-width:68ch;font-size:.97rem}
/* spec tables */
.tbl{margin:14px 0 20px;max-width:760px}
.tbl p.lead{margin:0 0 8px;font-size:.97rem}
table{width:100%;border-collapse:collapse;background:var(--sheet);border:1px solid var(--rule);font-size:.97rem}
thead th{background:var(--band);color:var(--onband);font:600 .98rem/1.2 var(--cond);text-align:left;padding:10px 14px}
tbody th{font:600 1rem/1.3 var(--cond);text-align:left;padding:11px 14px;width:24%;border-top:1px solid var(--rule);vertical-align:top}
td{padding:11px 14px;border-top:1px solid var(--rule);vertical-align:top;border-left:1px solid var(--rule)}
tbody tr:nth-child(even) th,tbody tr:nth-child(even) td{background:color-mix(in srgb,var(--rule) 20%,transparent)}
td.num{font-size:.93rem}
/* calculators: a spec readout */
.tool{background:var(--band);color:var(--onband);border-top:5px solid var(--amber);padding:22px 24px 24px;margin:18px 0 22px;max-width:760px}
.tool h3{margin:0 0 4px;font-size:1.3rem;color:var(--onband)}
.tool p{color:var(--onband-mute);margin:6px 0 14px;font-size:.95rem}
.tool .grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px 22px}
.tool label{display:block;font-weight:600;font-size:.93rem;margin-bottom:4px}
.tool input,.tool select{width:100%;min-height:46px;font-size:1.05rem;color:var(--onband);background:var(--band2);border:1px solid #3a4b5a;border-bottom:3px solid var(--onband-mute);border-radius:0;padding:8px 12px}
.tool select{font-family:var(--sans)}
.tool input:focus-visible,.tool select:focus-visible{outline:3px solid var(--onband);box-shadow:0 0 0 6px var(--amber)}
.readout{margin:20px 0 0;padding-top:16px;border-top:1px solid #33434f;display:grid;gap:10px}
.readout div{display:flex;justify-content:space-between;align-items:baseline;gap:16px;flex-wrap:wrap}
.readout dt{color:var(--onband-mute);font-size:.93rem}
.readout dd{margin:0;font:500 1.35rem/1.2 var(--mono);color:var(--amber);font-variant-numeric:tabular-nums}
.tool .msg{margin:14px 0 0;color:var(--onband);font-size:.97rem}
.tool .hint{font-size:.88rem;color:var(--onband-mute);margin:12px 0 0}
/* checklists */
.check{list-style:none;padding:0;max-width:68ch}
.check li{display:grid;grid-template-columns:22px 1fr;gap:10px;margin:9px 0}
.check li::before{content:"";width:16px;height:16px;border:2px solid var(--ink);margin-top:5px;background:var(--sheet)}
/* home */
.hero{background:var(--band);color:var(--onband);border-bottom:3px solid var(--amber)}
.hero .wrap{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:28px 56px;align-items:center;padding-top:56px;padding-bottom:56px}
.hero h1{color:var(--onband)}
.hero .lede{color:var(--onband-mute);margin:20px 0 0}
.hero a{color:var(--onband)}
.nas{width:100%;height:auto;display:block}
.index{margin:8px 0 0;max-width:none}
.index td,.index th{vertical-align:middle}
.index tbody th{width:auto}
.index .tag{font-size:.88rem;white-space:nowrap;color:var(--mute)}
.index a{font:700 1.22rem/1.2 var(--cond)}
.home-body{padding:10px 0 64px}
.home-body h2{margin-top:44px}
.home-body p,.home-body ul{max-width:68ch}
.method-table{max-width:760px}
/* footer */
.foot{background:var(--band);color:var(--onband-mute);border-top:3px solid var(--amber);padding:30px 0 40px;font-size:.93rem}
.foot .cols{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,2fr);gap:20px 48px}
.foot h2{font:700 1.1rem/1.2 var(--cond);color:var(--onband);margin:0 0 8px;padding:0;border:0}
.foot ul{list-style:none;padding:0;margin:0;columns:2;column-gap:28px}
.foot li{margin:0;break-inside:avoid}
.foot li a{display:inline-block;padding:7px 0;color:var(--onband)}
.foot p{margin:0 0 8px;max-width:48ch}
@media (max-width:940px){
  .layout{grid-template-columns:minmax(0,1fr)}
  .rail{position:static;padding-top:22px}
  .rail>h2,.rail>ol,.rail>ul{display:none}
  .rail details{display:block;background:var(--sheet);border:1px solid var(--rule);padding:0}
  .rail summary{font:700 1.05rem/1.2 var(--cond);padding:13px 14px;min-height:46px;cursor:pointer}
  .rail details ol{border:0;margin:0;padding:0 14px 10px}
  .rail details a{padding:8px 0}
  .hero .wrap{grid-template-columns:minmax(0,1fr);padding-top:36px;padding-bottom:36px}
  .nas{max-width:420px}
}
@media (max-width:640px){
  body{font-size:16px}
  .wrap{padding:0 16px}
  .sheet-head{padding:20px 18px 0;border-left-width:8px}
  .spec{grid-template-columns:minmax(0,1fr);margin:0 -18px}
  .spec>div{padding:9px 18px;border-right:0;border-bottom:1px solid var(--rule);display:flex;justify-content:space-between;gap:12px}
  .spec>div:last-child{border-bottom:0}
  h2{font-size:1.45rem}
  .tool{padding:18px 16px 20px}
  .tool .grid{grid-template-columns:minmax(0,1fr)}
  .readout dd{font-size:1.2rem}
  table.stack thead{position:absolute;left:-9999px}
  table.stack,table.stack tbody,table.stack tr,table.stack th,table.stack td{display:block;width:100%}
  table.stack tr{border-top:1px solid var(--rule);padding:4px 0 8px}
  table.stack tbody th{border:0;padding:8px 14px 2px;width:100%;background:none}
  table.stack td{border:0;padding:3px 14px 3px 14px;background:none}
  table.stack td::before{content:attr(data-label);display:block;font:600 .8rem/1.2 var(--cond);color:var(--mute)}
  tbody tr:nth-child(even) th,tbody tr:nth-child(even) td{background:none}
  .foot .cols{grid-template-columns:minmax(0,1fr)}
  .foot ul{columns:1}
  nav{gap:0 18px}
  .index .tag{display:block;white-space:normal}
}
@media (prefers-reduced-motion:no-preference){.hero .led{animation:led 3.2s ease-in-out infinite}}
@keyframes led{0%,80%,100%{opacity:1}88%{opacity:.25}}