@font-face{font-family:Plex;src:url(/assets/fonts/plex-var.woff2) format("woff2");font-weight:100 700;font-stretch:85% 100%;font-display:swap}
@font-face{font-family:PlexMono;src:url(/assets/fonts/plex-mono.woff2) format("woff2");font-weight:500;font-display:swap}
:root{--ink:#16202a;--paper:#f3f1ec;--card:#fffdf8;--red:#e0402f;--redd:#b52a1c;--steel:#2f5d7c;--mut:#5b636b;--line:#d8d3c7;--mono:PlexMono,ui-monospace,Menlo,monospace}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:Plex,system-ui,sans-serif;background:var(--paper);color:var(--ink);font-size:1.06rem;line-height:1.6}
a{color:var(--steel);text-underline-offset:.15em}a:hover{color:var(--redd)}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:1160px;margin:0 auto;padding:0 18px}
.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:#fff;padding:8px;z-index:9}
.top{background:var(--ink);color:#fff;border-bottom:4px solid var(--red);position:sticky;top:0;z-index:5}
.top-in{display:flex;align-items:center;justify-content:space-between;min-height:58px;gap:16px}
.logo{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;font-weight:700;font-size:1.15rem;font-stretch:88%}
.logo svg{width:34px;height:34px}.logo b{color:var(--red)}
.nav{display:none;gap:4px}.nav a{color:#dfe5ea;text-decoration:none;padding:6px 10px;border-radius:6px;font-size:.95rem}
.nav a:hover,.nav a[aria-current]{background:#26333f;color:#fff}
.menu summary{cursor:pointer;list-style:none;border:1px solid #55626e;padding:6px 12px;border-radius:6px;font-family:var(--mono);font-size:.85rem}
.menu summary::-webkit-details-marker{display:none}
.menu nav{position:absolute;right:12px;left:12px;top:60px;background:var(--ink);border:1px solid #33414e;border-radius:10px;padding:8px;display:grid}
.menu nav a{color:#fff;text-decoration:none;padding:10px;border-bottom:1px solid #26333f}
@media(min-width:900px){.nav{display:flex}.menu{display:none}}
.kicker,.lbl,.code,.tag,.crumbs{font-family:var(--mono);text-transform:uppercase;letter-spacing:.08em;font-size:.75rem}
.kicker{color:var(--red);margin:0 0 6px}
h1,h2,h3{line-height:1.2;font-stretch:88%}h1{font-size:clamp(1.9rem,6vw,3.1rem);margin:.1em 0 .3em;letter-spacing:-.01em}
h2{font-size:clamp(1.35rem,3.5vw,1.8rem);margin:1.6em 0 .5em}h3{font-size:1.15rem}
.hero{background:var(--ink);color:#fff;padding:38px 0 46px;background-image:repeating-linear-gradient(90deg,transparent 0 79px,#1e2a35 79px 80px)}
.hero-in{display:grid;gap:24px}.hero .lede{color:#cfd7de;max-width:62ch;font-size:1.12rem}
.gauge{display:none}.gauge svg{width:100%;max-width:300px;opacity:.95}
@media(min-width:900px){.hero-in{grid-template-columns:1.6fr 1fr;align-items:center}.gauge{display:flex;justify-content:center}}
.search label{display:block;font-family:var(--mono);font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;margin:18px 0 6px}
.search input{width:100%;font:inherit;font-size:1.1rem;padding:14px 16px;border-radius:10px;border:2px solid var(--red);background:#fff;color:var(--ink)}
.results{list-style:none;padding:0;margin:8px 0 0;display:grid;gap:6px}
.results a{display:block;background:#fff;color:var(--ink);padding:10px 14px;border-radius:8px;border-left:4px solid var(--red);text-decoration:none;font-weight:600}
.results .none{color:inherit;font-size:.95rem}
.phead{background:var(--ink);color:#fff;padding:26px 0 30px}.phead .lede{color:#cfd7de;max-width:70ch}.phead a{color:#9cc4e0}
.crumbs{color:#9aa6b1;margin:0 0 10px}
.layout{display:grid;gap:24px;padding:26px 18px 50px}
@media(min-width:1000px){.layout{grid-template-columns:230px minmax(0,1fr)}.layout.notoc{grid-template-columns:minmax(0,1fr)}.toc{position:sticky;top:80px;align-self:start}}
.toc{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:14px 16px;font-size:.92rem}.toc ol{margin:6px 0 0;padding-left:20px}
.prose{min-width:0;max-width:780px}.prose>h2:first-child{margin-top:0}
.answer{background:var(--card);border:1px solid var(--line);border-left:6px solid var(--steel);border-radius:10px;padding:14px 18px}.answer p{margin:.2em 0}.lbl{color:var(--steel);font-weight:500}
.safety{background:#fff1ee;border:1px solid #f0b9b0;border-left:6px solid var(--red);border-radius:10px;padding:12px 16px;margin:16px 0;font-size:.97rem}
.steps{counter-reset:s;list-style:none;padding:0}.steps li{counter-increment:s;position:relative;padding:8px 0 8px 46px;border-bottom:1px dashed var(--line)}
.steps li::before{content:counter(s,decimal-leading-zero);position:absolute;left:0;top:7px;font-family:var(--mono);background:var(--ink);color:#fff;border-radius:6px;padding:1px 6px;font-size:.85rem}
.causes{display:grid;gap:10px;margin:0}.causes div{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:10px 14px}.causes dt{font-weight:700}.causes dd{margin:2px 0 0;color:#333c44}
.pro li{margin:4px 0}.pro li::marker{color:var(--red)}
.srcs{font-size:.9rem}.srcs li{margin:3px 0;overflow-wrap:anywhere}
.qa{background:var(--card);border:1px solid var(--line);border-radius:10px;margin:8px 0;padding:0 14px}.qa summary{cursor:pointer;font-weight:600;padding:12px 0}.qa p{margin:0 0 12px}
.grid{display:grid;gap:14px}@media(min-width:640px){.g2,.g3{grid-template-columns:1fr 1fr}}@media(min-width:1000px){.g3{grid-template-columns:repeat(3,1fr)}}
.ticket{display:flex;flex-direction:column;gap:8px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px 14px 18px;text-decoration:none;color:var(--ink);position:relative;overflow:hidden}
.ticket::before{content:"";position:absolute;left:0;top:0;bottom:0;width:5px;background:var(--red)}
.ticket:hover{border-color:var(--ink);color:var(--ink)}.ticket h3{margin:0;font-size:1.06rem}.ticket[hidden]{display:none}
.code{color:var(--mut)}.go{margin-top:auto;color:var(--steel);font-weight:600;font-size:.92rem}
.tags{display:flex;flex-wrap:wrap;gap:6px}.tag{border-radius:999px;padding:2px 9px;font-size:.68rem;border:1px solid var(--line);background:#fff}
.t-cummins{background:#16202a;color:#fff;border-color:#16202a}.t-powerstroke{background:#2f5d7c;color:#fff;border-color:#2f5d7c}.t-duramax{background:#e9e4d8;color:#16202a}.tag.sys{color:var(--mut)}
.phead .tag{color:var(--ink)}.phead .t-cummins{background:#fff;color:var(--ink);border-color:#fff}
.filters{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0 16px}.filters button{font:inherit;font-size:.9rem;padding:7px 14px;border-radius:999px;border:1px solid var(--ink);background:#fff;color:var(--ink);cursor:pointer}
.filters button[aria-pressed=true]{background:var(--ink);color:#fff}
.band{padding:10px 0 20px}.eng-card{display:block;background:var(--ink);color:#fff;border-radius:12px;padding:18px;text-decoration:none;border-bottom:4px solid var(--red)}.eng-card b{font-size:1.3rem;display:block}.eng-card span{color:#cfd7de}.eng-card:hover{color:#fff;background:#22303c}
.how div{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px}.how p{margin:.3em 0 0}
.photo{margin:20px 0}.photo img{border-radius:10px;width:100%}.photo figcaption{font-size:.88rem;color:var(--mut);margin-top:6px}.credit{display:block;font-size:.82rem}
.small{font-size:.88rem;color:var(--mut)}.reviewed{border-top:1px solid var(--line);padding-top:10px;margin-top:30px}
.foot{background:var(--ink);color:#cfd7de;padding:34px 0 24px;margin-top:30px;font-size:.93rem}.foot a{color:#fff}.foot h2{font-size:.85rem;font-family:var(--mono);text-transform:uppercase;letter-spacing:.08em;color:#9aa6b1;margin:0 0 8px}
.foot ul{list-style:none;padding:0;margin:0}.foot li{margin:4px 0}.cols{display:grid;gap:22px}@media(min-width:800px){.cols{grid-template-columns:2fr 1fr 1fr}}
.flogo{font-weight:700;font-size:1.2rem;color:#fff;margin:0}.flogo b{color:var(--red)}
.disc-line,.legal{border-top:1px solid #2b3946;padding-top:12px;margin-top:18px;font-size:.84rem;color:#a9b4be}
main .wrap>.photo{max-width:820px}
.phead .t-powerstroke{color:#fff}
.g4{grid-template-columns:1fr 1fr}@media(min-width:1000px){.g4{grid-template-columns:repeat(4,1fr)}}
.eng-card span{display:block;font-size:.9rem;margin-top:4px}
.veh-card{display:block;background:var(--card);border:1px solid var(--line);border-top:4px solid var(--steel);border-radius:12px;padding:14px 16px;text-decoration:none;color:var(--ink)}.veh-card b{display:block;font-size:1.1rem}.veh-card span{color:var(--mut);font-size:.9rem}.veh-card:hover{border-color:var(--ink);color:var(--ink)}
.filters label{display:flex;align-items:center;gap:6px;font-family:var(--mono);font-size:.78rem;text-transform:uppercase;letter-spacing:.06em}
.filters select{font:inherit;font-family:Plex,system-ui,sans-serif;text-transform:none;letter-spacing:0;font-size:.95rem;padding:7px 10px;border-radius:8px;border:1px solid var(--ink);background:#fff;color:var(--ink);max-width:60vw}
.filters .chk{text-transform:none;font-family:Plex,system-ui,sans-serif;font-size:.92rem;letter-spacing:0}
.filters{align-items:center}
.tag{background:#fff}.tag.t-all{background:var(--ink);color:#fff;border-color:var(--ink)}.tag.veh{color:var(--steel)}
.tags .tag:not(.t-all):not(.veh):not(.sys){background:var(--steel);color:#fff;border-color:var(--steel)}
.phead .tag.t-all{background:#fff;color:var(--ink)}
.cols2{columns:2 220px;padding-left:18px}.cols2 li{margin:3px 0;break-inside:avoid}
.tbl{overflow-x:auto;margin:10px 0}.tbl table{border-collapse:collapse;width:100%;font-size:.94rem;background:var(--card)}.tbl th,.tbl td{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}.tbl th{background:var(--ink);color:#fff;font-weight:600}
.btn{display:inline-block;background:var(--red);color:#fff;text-decoration:none;padding:10px 16px;border-radius:8px;font-weight:600;margin-top:12px}.btn:hover{background:var(--redd);color:#fff}
.sysgrp[hidden]{display:none}