/* ==========================================================================
   Large-Load Grid Integration — web edition
   Layout: fixed header with live search · persistent left contents frame ·
   centre column · on-this-page rail. Palette carried from the print edition.
   Signature: the busbar — a conductor rail under the header with a tap-node
   travelling it as you read, the way a one-line diagram shows a load tapping
   a bus. Mono is reserved for identifiers, because this report runs on them.
   ========================================================================== */
:root{
  --ink:#12202C; --paper:#FAFBFC; --panel:#FFFFFF; --soft:#F1F4F7;
  --navy:#1F3A5F; --energized:#C05621; --tie:#2C7A7B;
  --grey:#5B6470; --rule:#D9DFE5; --bar:#0E1A24; --focus:#3B82F6;
  --link:#1F5C8C; --thead-bg:#1F3A5F; --thead-fg:#FFFFFF;
  --side:#F5F7F9;
  --shadow:0 1px 2px rgba(18,32,44,.06),0 10px 30px rgba(18,32,44,.10);
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --hdr:56px; --sidew:18.5rem;
}
@media (prefers-color-scheme:dark){:root{
  --ink:#DFE6EC; --paper:#0F1519; --panel:#151C22; --soft:#1A2229; --side:#121A20;
  --navy:#8FB6DD; --rule:#2C363E; --grey:#96A1AC; --bar:#070B0E;
  --energized:#E07B45; --tie:#54A9A9; --link:#8FB6DD;
  --thead-bg:#22323F; --thead-fg:#E7EDF2;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 10px 30px rgba(0,0,0,.5)}}
html[data-theme="light"]{--ink:#12202C;--paper:#FAFBFC;--panel:#FFFFFF;--soft:#F1F4F7;
  --side:#F5F7F9;--navy:#1F3A5F;--rule:#D9DFE5;--grey:#5B6470;--bar:#0E1A24;
  --energized:#C05621;--tie:#2C7A7B;--link:#1F5C8C;--thead-bg:#1F3A5F;--thead-fg:#FFFFFF;
  --shadow:0 1px 2px rgba(18,32,44,.06),0 10px 30px rgba(18,32,44,.10)}
html[data-theme="dark"]{--ink:#DFE6EC;--paper:#0F1519;--panel:#151C22;--soft:#1A2229;
  --side:#121A20;--navy:#8FB6DD;--rule:#2C363E;--grey:#96A1AC;--bar:#070B0E;
  --energized:#E07B45;--tie:#54A9A9;--link:#8FB6DD;--thead-bg:#22323F;--thead-fg:#E7EDF2;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 10px 30px rgba(0,0,0,.5)}


/* --------------------------------------------------------------------------
   Section colour. Utility one-line diagrams code conductors by voltage class,
   so an eight-hue ramp is the native way to tell these sections apart. Each of
   the eight problems carries one hue through the contents frame, its card, its
   eyebrow, its rule and its busbar. Everything else in the report stays navy:
   colour here means "which problem", not "look at me".
   -------------------------------------------------------------------------- */
:root{
  --s1:#3B4E8C; --s2:#186B62; --s3:#8A5D12; --s4:#A32F45;
  --s5:#654197; --s6:#26704A; --s7:#215F86; --s8:#A64A22;
  --s1t:#EDF0F8; --s2t:#E6F2F0; --s3t:#F7F0E2; --s4t:#F9EBEE;
  --s5t:#F1ECF8; --s6t:#E8F2EC; --s7t:#E9F1F6; --s8t:#F9EDE6;
  --sec:var(--navy); --sect:var(--soft); --onsec:#FFFFFF; --likely:#8A6D1F;
}
@media (prefers-color-scheme:dark){:root{
  --s1:#8FA3E0; --s2:#5FB9AC; --s3:#D4A24C; --s4:#E88397;
  --s5:#B394E4; --s6:#6FC28F; --s7:#6FAFD6; --s8:#E8956B;
  --s1t:#191F30; --s2t:#122522; --s3t:#2A2211; --s4t:#2B171C;
  --s5t:#211A2E; --s6t:#13251A; --s7t:#132330; --s8t:#2B1C12; --onsec:#0F1519; --likely:#D4A24C;}}
html[data-theme="dark"]{
  --s1:#8FA3E0; --s2:#5FB9AC; --s3:#D4A24C; --s4:#E88397;
  --s5:#B394E4; --s6:#6FC28F; --s7:#6FAFD6; --s8:#E8956B;
  --s1t:#191F30; --s2t:#122522; --s3t:#2A2211; --s4t:#2B171C;
  --s5t:#211A2E; --s6t:#13251A; --s7t:#132330; --s8t:#2B1C12; --onsec:#0F1519; --likely:#D4A24C;}
html[data-theme="light"]{
  --s1:#3B4E8C; --s2:#186B62; --s3:#8A5D12; --s4:#A32F45;
  --s5:#654197; --s6:#26704A; --s7:#215F86; --s8:#A64A22;
  --s1t:#EDF0F8; --s2t:#E6F2F0; --s3t:#F7F0E2; --s4t:#F9EBEE;
  --s5t:#F1ECF8; --s6t:#E8F2EC; --s7t:#E9F1F6; --s8t:#F9EDE6; --onsec:#FFFFFF; --likely:#8A6D1F;}

body[data-sec="1"]{--sec:var(--s1);--sect:var(--s1t)}
body[data-sec="2"]{--sec:var(--s2);--sect:var(--s2t)}
body[data-sec="3"]{--sec:var(--s3);--sect:var(--s3t)}
body[data-sec="4"]{--sec:var(--s4);--sect:var(--s4t)}
body[data-sec="5"]{--sec:var(--s5);--sect:var(--s5t)}
body[data-sec="6"]{--sec:var(--s6);--sect:var(--s6t)}
body[data-sec="7"]{--sec:var(--s7);--sect:var(--s7t)}
body[data-sec="8"]{--sec:var(--s8);--sect:var(--s8t)}
.c1{--sec:var(--s1);--sect:var(--s1t)} .c2{--sec:var(--s2);--sect:var(--s2t)}
.c3{--sec:var(--s3);--sect:var(--s3t)} .c4{--sec:var(--s4);--sect:var(--s4t)}
.c5{--sec:var(--s5);--sect:var(--s5t)} .c6{--sec:var(--s6);--sect:var(--s6t)}
.c7{--sec:var(--s7);--sect:var(--s7t)} .c8{--sec:var(--s8);--sect:var(--s8t)}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--hdr) + 22px)}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}}
body{margin:0;background:var(--paper);color:var(--ink);
  font:16.5px/1.65 var(--sans);-webkit-font-smoothing:antialiased}
.skip{position:absolute;left:-999px;top:0;z-index:300;background:var(--navy);color:#fff;padding:.6rem 1rem}
.skip:focus{left:0}
:focus-visible{outline:2px solid var(--focus);outline-offset:2px;border-radius:3px}

/* ---------- header ---------- */
.hdr{position:fixed;inset:0 0 auto 0;height:var(--hdr);z-index:80;background:var(--bar);
  display:flex;align-items:center;gap:.6rem;padding:0 .9rem}
.mark{display:flex;align-items:baseline;gap:.5rem;text-decoration:none;color:#fff;
  font-weight:680;letter-spacing:-.015em;font-size:.95rem;white-space:nowrap;
  width:calc(var(--sidew) - 1.8rem);flex:none}
.mark .glyph{font-family:var(--mono);color:var(--energized);font-size:1.1rem;letter-spacing:-.1em}
.mark .v{font-family:var(--mono);font-size:.66rem;color:#93A3B0}
.hdr .sp{flex:1}
.hbtn{appearance:none;background:transparent;border:1px solid transparent;color:#C9D5DE;
  font:inherit;font-size:.83rem;padding:.38rem .62rem;border-radius:6px;cursor:pointer;
  display:inline-flex;align-items:center;gap:.35rem;text-decoration:none;white-space:nowrap}
.hbtn:hover{background:rgba(255,255,255,.1);color:#fff}
.hbtn.ghost{border-color:rgba(255,255,255,.22)}
#burger{display:none}

/* search sits in the header, always visible */
.sbox{position:relative;flex:1;max-width:34rem}
.sbox .in{display:flex;align-items:center;gap:.5rem;background:rgba(255,255,255,.1);
  border:1px solid rgba(255,255,255,.16);border-radius:7px;padding:.36rem .65rem}
.sbox .in:focus-within{background:rgba(255,255,255,.16);border-color:rgba(255,255,255,.4)}
.sbox input{flex:1;border:0;background:transparent;color:#fff;font:inherit;font-size:.88rem;outline:0;min-width:0}
.sbox input::placeholder{color:#8B9BA8}
.sbox .k{font-family:var(--mono);font-size:.68rem;border:1px solid rgba(255,255,255,.25);
  border-radius:3px;padding:0 .3rem;color:#93A3B0;flex:none}
.sres{position:absolute;top:calc(100% + .5rem);left:0;right:0;background:var(--panel);
  border:1px solid var(--rule);border-radius:9px;box-shadow:var(--shadow);
  max-height:70vh;overflow:auto;display:none;padding:.35rem}
.sres[data-open="true"]{display:block}
.sres .meta{font-family:var(--mono);font-size:.68rem;color:var(--grey);
  padding:.4rem .7rem;border-bottom:1px solid var(--rule);margin-bottom:.25rem}
.hit{display:block;padding:.55rem .7rem;border-radius:6px;text-decoration:none;color:var(--ink)}
.hit:hover,.hit[data-sel="true"]{background:var(--soft)}
.hit .where{font-family:var(--mono);font-size:.67rem;color:var(--energized);
  text-transform:uppercase;letter-spacing:.05em}
.hit .ttl{font-weight:640;font-size:.92rem;margin:.12rem 0;color:var(--navy);display:block}
.hit .snip{font-size:.82rem;color:var(--grey);line-height:1.5;display:block}
.hit mark{background:rgba(192,86,33,.2);color:inherit;border-radius:2px;padding:0 .1em}
.sres .note{padding:1.2rem .9rem;color:var(--grey);font-size:.86rem;line-height:1.55}
.sres .note code{font-family:var(--mono);background:var(--soft);padding:.1rem .3rem;border-radius:3px}

/* ---------- busbar ---------- */
.busbar{position:fixed;top:var(--hdr);left:0;right:0;height:12px;z-index:79;
  background:var(--paper);border-bottom:1px solid var(--rule);overflow:hidden}
.busbar .con{position:absolute;left:0;right:0;top:4px;height:2px;background:var(--rule)}
.busbar .live{position:absolute;left:0;top:4px;height:2px;width:0;background:var(--sec)}
.busbar .tap{position:absolute;top:0;left:0;width:11px;height:12px;margin-left:-5px}
.busbar .tap i{position:absolute;left:5px;top:5px;width:1px;height:7px;background:var(--sec)}
.busbar .tap b{position:absolute;left:2px;top:1px;width:7px;height:7px;border-radius:50%;
  background:var(--sec);box-shadow:0 0 0 2px var(--paper)}

/* ---------- contents frame ---------- */
.side{position:fixed;top:calc(var(--hdr) + 12px);bottom:0;left:0;width:var(--sidew);
  background:var(--side);border-right:1px solid var(--rule);overflow-y:auto;
  padding:1.1rem .55rem 3rem;z-index:70}
.side .lbl{font-family:var(--mono);font-size:.64rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--grey);margin:1.1rem .6rem .35rem;font-weight:700}
.side .lbl:first-child{margin-top:.2rem}
.side a{display:block;padding:.29rem .6rem;border-radius:5px;text-decoration:none;
  color:var(--ink);font-size:.855rem;line-height:1.35}
.side a:hover{background:var(--panel);color:var(--navy)}
.side a[aria-current="page"]{background:var(--sect);color:var(--sec);font-weight:660;
  box-shadow:inset 3px 0 0 var(--sec)}
.side a[aria-current="page"] .n{color:var(--sec)}
.side a .n{font-family:var(--mono);color:var(--sec);font-size:.76rem;margin-right:.45rem;
  font-weight:650}
.side .kids{margin:.15rem 0 .3rem .95rem;border-left:1px solid var(--rule);padding-left:.35rem}
.side .kids a{font-size:.795rem;color:var(--grey);padding:.2rem .5rem}
.side .kids a:hover{color:var(--navy);background:var(--panel)}
.side .kids a[aria-current="true"]{color:var(--sec);font-weight:650;background:var(--sect);
  box-shadow:inset 3px 0 0 var(--sec);border-radius:0 5px 5px 0}
.side details{margin:0}
.side summary{list-style:none;cursor:pointer;display:block}
.side summary::-webkit-details-marker{display:none}
.side summary .car{float:right;color:var(--grey);font-size:.7rem;transition:transform .15s}
.side details[open] summary .car{transform:rotate(90deg)}
.side .foot{margin:1.4rem .6rem 0;padding-top:.9rem;border-top:1px solid var(--rule);
  display:flex;flex-direction:column;gap:.35rem}
.side .foot a{border:1px solid var(--rule);border-radius:6px;text-align:center;font-size:.8rem;
  background:var(--panel)}

/* ---------- content columns ---------- */
.wrap{margin-left:var(--sidew);padding-top:calc(var(--hdr) + 12px);
  display:grid;grid-template-columns:minmax(0,1fr) 15rem;gap:2.4rem;
  max-width:66rem;padding-left:2.6rem;padding-right:1.2rem}
main{max-width:44rem;padding:1.9rem 0 5rem;min-width:0}
.rail{padding:2.4rem 0 3rem;position:sticky;top:calc(var(--hdr) + 34px);align-self:start;
  max-height:calc(100vh - var(--hdr) - 50px);overflow:auto}
.rail .lbl{font-family:var(--mono);font-size:.63rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--grey);margin:0 0 .5rem;font-weight:700}
.rail a{display:block;font-size:.8rem;line-height:1.4;color:var(--grey);text-decoration:none;
  padding:.3rem .55rem .3rem .8rem;border-left:2px solid var(--rule);border-radius:0 5px 5px 0;
  position:relative;transition:background .12s,color .12s}
.rail a:hover{color:var(--navy);background:var(--soft)}
/* The active entry gets four cues at once — a thick coloured spine, a tinted
   chip, a node on the rail, and weight. One cue alone was too easy to miss. */
.rail a[aria-current="true"]{color:var(--sec);font-weight:660;
  background:var(--sect);border-left:3px solid var(--sec);padding-left:.75rem}
.rail a[aria-current="true"]::before{content:"";position:absolute;left:-6.5px;top:50%;
  width:9px;height:9px;margin-top:-4.5px;border-radius:50%;background:var(--sec);
  box-shadow:0 0 0 2.5px var(--paper)}

/* ---------- typography ---------- */
.crumbs{font-family:var(--mono);font-size:.72rem;color:var(--grey);margin:0 0 1.1rem;
  display:flex;flex-wrap:wrap;gap:.4rem;align-items:center}
.crumbs a{color:var(--grey);text-decoration:none}
.crumbs a:hover{color:var(--navy);text-decoration:underline}
.crumbs .sep{opacity:.5}
.crumbs [aria-current]{color:var(--sec);font-weight:640}
.eyebrow{font-family:var(--mono);font-size:.71rem;letter-spacing:.09em;text-transform:uppercase;
  color:var(--sec);margin:0 0 .5rem;display:inline-flex;align-items:center;gap:.5rem}
.eyebrow::before{content:'';width:1.6rem;height:3px;background:var(--sec);border-radius:2px}
h1{font-size:2.05rem;line-height:1.16;letter-spacing:-.022em;color:var(--navy);
  margin:.3rem 0 1rem;font-weight:710}
main>article>h1:first-of-type{padding-bottom:.55rem;border-bottom:2px solid var(--sec)}
h2{font-size:1.3rem;line-height:1.28;letter-spacing:-.012em;color:var(--navy);
  margin:2.7rem 0 .7rem;font-weight:670}
h3{font-size:1.02rem;color:var(--sec);margin:1.9rem 0 .5rem;font-weight:660}
p{margin:0 0 1rem}
a{color:var(--link);text-underline-offset:2px}
.anch{opacity:0;margin-left:.4rem;font-weight:400;text-decoration:none;color:var(--rule);
  font-family:var(--mono);font-size:.8em}
h1:hover .anch,h2:hover .anch,h3:hover .anch,.anch:focus{opacity:1}
ul{margin:0 0 1.15rem;padding-left:1.2rem}
li{margin:0 0 .55rem}
li::marker{color:var(--sec)}
dl{margin:0 0 1.4rem}
dt{font-weight:650;color:var(--navy);margin:1.1rem 0 .2rem;font-size:.97rem}
dd{margin:0 0 .5rem;font-size:.96rem}
.dt{font-family:var(--mono);font-weight:400;color:var(--grey);font-size:.76rem;margin-left:.4rem}
.cap{font-size:.83rem;color:var(--grey);font-style:italic;margin:.1rem 0 1.6rem;
  border-left:2px solid var(--sec);padding-left:.8rem}
.src{font-size:.77rem;color:var(--grey);margin:-.9rem 0 1.7rem;padding-left:.8rem;
  border-left:2px solid var(--rule)}
.tw{overflow-x:auto;margin:0 0 .5rem;border:1px solid var(--rule);border-radius:7px;background:var(--panel)}
table{border-collapse:collapse;width:100%;font-size:.85rem;min-width:28rem}
th,td{border-bottom:1px solid var(--rule);padding:.5rem .68rem;text-align:left;vertical-align:top}
thead th{background:var(--sec);color:var(--onsec);font-weight:620;position:sticky;top:0;
  font-size:.78rem}
tr.grp th{background:var(--sect);color:var(--sec);font-size:.8rem}
tbody tr:nth-child(even){background:color-mix(in srgb,var(--sect) 45%,transparent)}
tbody tr:last-child td{border-bottom:0}
figure{margin:0 0 .4rem;border:1px solid var(--rule);border-radius:7px;overflow:hidden;background:var(--panel)}
img{max-width:100%;height:auto;display:block}
aside{border-left:3px solid var(--sec);background:var(--sect);padding:.85rem 1.1rem;
  margin:0 0 1.5rem;border-radius:0 7px 7px 0}
/* Assessment boxes are tinted by confidence, mixed against the panel colour so
   the tint follows the theme automatically instead of needing a second set of
   rules for dark mode. */
aside.assess{--c:var(--navy)}
aside.assess.settled{--c:var(--navy)}
aside.assess.likely{--c:var(--likely)}
aside.assess.emerging{--c:var(--energized)}
aside.assess.speculative{--c:var(--grey)}
aside.assess{border-left-color:var(--c);
  background:color-mix(in srgb, var(--c) 9%, var(--panel))}
@supports not (background:color-mix(in srgb,red 9%,blue)){
  aside.assess{background:var(--soft)}}
aside.note{border-left-color:var(--tie)}
aside.callout{border-left-color:var(--navy)}
aside .lbl{font-family:var(--mono);font-size:.67rem;letter-spacing:.08em;text-transform:uppercase;
  color:var(--grey);font-weight:700;margin:0 0 .4rem;display:flex;align-items:center;gap:.5rem}
aside p:last-child{margin:0}
.conf{font-family:var(--mono);padding:.08rem .4rem;border-radius:3px;color:var(--onsec);font-size:.64rem;font-weight:650}
.conf.settled{background:var(--navy)}.conf.likely{background:var(--likely)}
.conf.emerging{background:var(--energized)}.conf.speculative{background:var(--grey)}

/* ---------- landing ---------- */
.lede{border-bottom:1px solid var(--rule);padding-bottom:1.5rem;margin-bottom:1.8rem}
.lede .t{background:linear-gradient(90deg,var(--s1),var(--s5) 55%,var(--s8));
  -webkit-background-clip:text;background-clip:text;color:transparent}
@supports not (background-clip:text){.lede .t{color:var(--navy)}}
.lede .t{font-size:2.45rem;line-height:1.1;letter-spacing:-.03em;color:var(--navy);
  margin:.35rem 0 .45rem;font-weight:730}
.lede .s{font-size:1.06rem;color:var(--grey);margin:0 0 1.3rem;line-height:1.45}
.lede .ab{font-size:1.02rem;line-height:1.66}
.facts{display:flex;flex-wrap:wrap;gap:.45rem;margin:1.3rem 0 0}
.fact{font-family:var(--mono);font-size:.715rem;color:var(--grey);border:1px solid var(--rule);
  border-radius:5px;padding:.26rem .55rem;background:var(--panel)}
.fact b{color:var(--navy);font-weight:600}
.grid8{display:grid;grid-template-columns:repeat(auto-fill,minmax(14.5rem,1fr));gap:.7rem;margin:1.4rem 0 2rem}
.card{border:1px solid var(--rule);border-top:3px solid var(--sec);border-radius:8px;
  padding:.8rem .95rem .85rem;background:var(--panel);text-decoration:none;color:var(--ink);
  display:block;transition:border-color .15s,transform .15s,box-shadow .15s}
.card:hover{border-color:var(--sec);transform:translateY(-2px);box-shadow:var(--shadow)}
.card .k{font-family:var(--mono);font-size:.75rem;color:var(--sec);font-weight:650}
.card .h{font-weight:645;font-size:.92rem;color:var(--sec);margin:.16rem 0 .22rem;line-height:1.3}
.card .d{font-size:.79rem;color:var(--grey);line-height:1.45}

.pager{display:grid;grid-template-columns:1fr 1fr;gap:.7rem;margin:3rem 0 0}
.pager a{border:1px solid var(--rule);border-radius:8px;padding:.7rem .9rem;text-decoration:none;
  color:var(--ink);background:var(--panel)}
.pager a:hover{border-color:var(--sec)}
.pager .h{color:var(--sec)}
.pager .k{font-family:var(--mono);font-size:.67rem;color:var(--grey);text-transform:uppercase}
.pager .h{font-size:.88rem;color:var(--navy);font-weight:600;margin-top:.15rem;line-height:1.3;display:block}
.pager .nx{text-align:right}
.cite{font-size:.79rem;color:var(--grey);border-top:1px solid var(--rule);margin-top:3rem;
  padding-top:1.1rem;line-height:1.6}
.cite code{font-family:var(--mono);font-size:.95em}

.scrim{position:fixed;inset:0;background:rgba(10,18,24,.45);z-index:69;display:none}
.scrim[data-open="true"]{display:block}

@media (max-width:1180px){
  .wrap{grid-template-columns:minmax(0,1fr);padding-left:2rem}
  .rail{display:none}
}
@media (max-width:900px){
  :root{--hdr:54px}
  #burger{display:inline-flex}
  .mark{width:auto}
  .mark .v,.mark .full{display:none}
  .side{transform:translateX(-100%);transition:transform .2s ease;width:min(20rem,84vw)}
  .side[data-open="true"]{transform:none;box-shadow:var(--shadow)}
  .wrap{margin-left:0;padding-left:1rem;padding-right:1rem;max-width:100%}
  .hbtn .lg{display:none}
  .sbox{max-width:none}
  .lede .t{font-size:1.85rem}
  .pager{grid-template-columns:1fr}
  table{min-width:22rem}
}