:root{
  --tarmac:#243238;--hose:#3b4a51;--amber:#e8a317;--amber-d:#c98a0b;--kerb:#eef1f2;--paper:#fff;
  --verge:#1f7a4d;--ink:#1f292d;--mut:#5b686e;--line:#d6dde0;
  --head:'Barlow Condensed','Arial Narrow',Arial,sans-serif;
  --body:'Source Serif 4',Georgia,'Times New Roman',serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:1.0625rem/1.72 var(--body);color:var(--ink);background:var(--paper);padding-bottom:0}
a{color:#1d5f86;text-underline-offset:.15em}
a:hover{color:var(--tarmac)}
:focus-visible{outline:3px solid var(--amber);outline-offset:2px}
.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:#fff;padding:8px;z-index:9}

.top{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem 1.4rem;padding:.7rem 1.4rem;background:var(--tarmac);position:sticky;top:0;z-index:5}
.brand{display:block;line-height:0}
.logo{height:44px;width:auto;margin:0;border-radius:0}
.top nav{display:flex;flex-wrap:wrap;gap:1.1rem;font:600 1.02rem/1 var(--head);letter-spacing:.01em}
.top nav a{color:#cfdadf;text-decoration:none;padding:.35rem 0;border-bottom:2px solid transparent}
.top nav a:hover{color:#fff;border-bottom-color:var(--amber)}
.tel{margin-left:auto;background:var(--amber);color:var(--tarmac);padding:.55rem 1rem;font:700 1.12rem/1 var(--head);text-decoration:none;white-space:nowrap;border-radius:4px}
.tel:hover{background:#f2b331;color:var(--tarmac)}

.crumbs{max-width:44rem;margin:1.1rem auto 0;padding:0 1.25rem;font:500 .95rem/1.4 var(--head);color:var(--mut)}
.crumbs a{color:var(--mut)}.crumbs i{opacity:.45;font-style:normal;padding:0 .15rem}

main{max-width:44rem;margin:0 auto;padding:.4rem 1.25rem 3rem}
h1,h2,h3{font-family:var(--head);color:var(--tarmac);font-weight:700;letter-spacing:.005em}
h1{font-size:2.55rem;line-height:1.04;margin:.7rem 0 1.1rem;max-width:20ch}
h2{font-size:1.62rem;line-height:1.15;margin:2.4rem 0 .6rem}
h3{font-size:1.2rem;margin:1.4rem 0 .4rem}
p{margin:.75rem 0}
img{max-width:100%;height:auto;display:block;margin:1.4rem 0;border-radius:4px}

.byline{font:500 1rem/1.4 var(--head);color:var(--mut);margin:-.4rem 0 1.4rem}
.byline a{color:var(--hose)}

.ans{background:var(--paper);border:1px solid var(--line);border-left:6px solid var(--amber);padding:1rem 1.2rem;margin:1.2rem 0 1.6rem;border-radius:0 4px 4px 0}
.ans b{display:block;font:700 1.05rem/1 var(--head);color:var(--hose);margin-bottom:.35rem}
.ans p{margin:.4rem 0}
.ansc{margin-top:.8rem!important}

.cta{display:inline-block;background:var(--amber);color:var(--tarmac)!important;padding:.7rem 1.15rem;font:700 1.15rem/1 var(--head);text-decoration:none;border-radius:4px;margin:.6rem 0}
.cta:hover{background:#f2b331}

table{width:100%;border-collapse:collapse;margin:1rem 0 1.2rem;font-size:.97rem;line-height:1.5}
caption{caption-side:top;text-align:left;font-size:.9rem;color:var(--mut);padding-bottom:.55rem}
th,td{border-bottom:1px solid var(--line);padding:.6rem .6rem .6rem 0;text-align:left;vertical-align:top}
thead th{font:700 1rem/1.2 var(--head);color:var(--hose);border-bottom:2px solid var(--tarmac)}
.facts{border-top:2px solid var(--tarmac)}
.facts th{width:34%;font:600 1.02rem/1.35 var(--head);color:var(--hose)}

.howto{padding-left:0;list-style:none;counter-reset:s;margin:1rem 0}
.howto li{counter-increment:s;position:relative;padding:.1rem 0 .7rem 2.6rem}
.howto li::before{content:counter(s);position:absolute;left:0;top:.05rem;width:1.8rem;height:1.8rem;border-radius:50%;background:var(--tarmac);color:var(--amber);font:700 1.05rem/1.8rem var(--head);text-align:center}
.ask{padding-left:1.1rem}.ask li{margin:.35rem 0}
.terms{columns:2;column-gap:2rem;font-size:.93rem;color:var(--mut);padding-left:1.1rem}

.notebook{list-style:none;padding:0;margin:.6rem 0 1.4rem;border-top:2px solid var(--tarmac)}
.notebook li{border-bottom:1px solid var(--line);padding:.7rem 0}
.notebook a{font:600 1.18rem/1.25 var(--head);color:var(--tarmac);text-decoration:none}
.notebook a:hover{color:#1d5f86;text-decoration:underline}
.notebook span{display:block;font-size:.93rem;color:var(--mut)}

.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:.1rem 1.4rem;margin:.8rem 0}
.card{display:block;padding:.7rem 0;border-bottom:1px solid var(--line);text-decoration:none;color:inherit}
.card b{display:block;font:600 1.12rem/1.2 var(--head);color:var(--tarmac)}
.card span{font-size:.92rem;color:var(--mut)}

.meshbox{margin:1.8rem 0;padding-top:.2rem}
.meshbox h3{margin:0 0 .5rem;font-size:1.1rem;color:var(--hose)}
.mesh{display:flex;flex-wrap:wrap;gap:.35rem .5rem}
.mesh a{font:500 .98rem/1.3 var(--head);background:var(--kerb);padding:.32rem .65rem;text-decoration:none;color:var(--tarmac);border-radius:3px}
.mesh a:hover{background:#dde4e6}

.faq details{border-bottom:1px solid var(--line);padding:.7rem 0}
.faq summary{cursor:pointer;font:600 1.12rem/1.3 var(--head);color:var(--tarmac)}
.faq details p{margin:.5rem 0 .2rem}

.reviews{border-top:2px solid var(--verge);padding:.9rem 0 .2rem;margin:2rem 0}
.rstars{font:600 1.1rem/1.2 var(--head);color:var(--verge)}
.rstars b{font-size:1.9rem;color:var(--tarmac);margin-right:.2rem}
.rstars span{letter-spacing:1px}
.reviews p{font-size:.97rem}
.rcrit{color:var(--mut)}

.ie{border-left:6px solid var(--verge);background:#f3f8f5;padding:.9rem 1.1rem;border-radius:0 4px 4px 0}
.corp,.network{background:var(--kerb);padding:.9rem 1.1rem;border-radius:4px}
.corp p{font-size:.95rem;margin:.2rem 0}
.netlist{margin:.3rem 0 0;padding-left:1.1rem;font-size:.95rem}
.netlist li{margin:.25rem 0}
.aside{font-size:.97rem;color:var(--mut);border-left:3px solid var(--line);padding-left:.9rem;margin:1.4rem 0}
.src{font-size:.9rem;color:var(--mut);margin-top:2rem}

.foot{background:var(--tarmac);color:#b9c7cd;padding:2rem 1.25rem 2.4rem;font-size:.93rem;line-height:1.6}
.foot p{max-width:44rem;margin:.6rem auto}
.foot nav{max-width:44rem;margin:1rem auto;display:flex;flex-wrap:wrap;gap:.35rem 1rem;font:500 1rem/1.4 var(--head)}
.foot a{color:#ffd27a}
.ffline{border-top:1px solid rgba(255,255,255,.14);padding-top:.9rem}

.sticky{display:none}

@media(max-width:760px){
  body{font-size:1.02rem;padding-bottom:66px}
  .top{padding:.55rem .85rem;gap:.45rem}
  .logo{height:36px}
  .top nav{order:3;width:100%;gap:.9rem;overflow-x:auto;flex-wrap:nowrap;scrollbar-width:none;-webkit-overflow-scrolling:touch;padding-bottom:.15rem}
  .top nav::-webkit-scrollbar{display:none}
  .top nav a{white-space:nowrap}
  .tel{padding:.5rem .7rem;font-size:1rem}
  main{padding:.3rem .95rem 2rem}
  .crumbs{padding:0 .95rem;white-space:nowrap;overflow-x:auto}
  h1{font-size:2rem}
  h2{font-size:1.4rem;margin-top:2rem}
  .cta{display:block;text-align:center;padding:.9rem 1rem}
  table{display:block;overflow-x:auto;white-space:nowrap}
  .facts{display:table;white-space:normal}
  .facts th{width:40%}
  .terms{columns:1}
  .sticky{display:block;position:fixed;left:0;right:0;bottom:0;background:var(--amber);z-index:8;text-align:center}
  .sticky a{display:block;padding:.95rem;color:var(--tarmac);font:700 1.15rem/1 var(--head);text-decoration:none}
}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* ── hero reel ── self-hosted, muted, looping; see README "Hero reel" ─────── */
.pic{position:relative;display:block;margin:1.2rem auto 0;border-radius:4px;overflow:hidden;
  border:1px solid var(--line);background:var(--kerb);width:min(100%,max(230px,42vh),380px);
  aspect-ratio:var(--vr,9/16);font-size:0;color:transparent;box-shadow:0 8px 28px rgba(36,50,56,.22)}
.pic::before{content:"Wrong Fuel Drain";position:absolute;inset:0;z-index:0;display:flex;align-items:center;
  justify-content:center;font-family:var(--head);font-size:1rem;font-weight:700;color:var(--mut);background:var(--kerb)}
.pic::after{content:"";position:absolute;inset:0;z-index:2;pointer-events:none;
  background:linear-gradient(180deg,rgba(4,10,18,.5) 0,transparent 18%,transparent 55%,rgba(4,10,18,.85) 100%)}
.pic video{position:absolute;inset:0;z-index:1;width:100%;height:100%;object-fit:cover;object-position:center;
  display:block;border:0;margin:0;background:var(--kerb)}
.pic .i{display:inline-block;flex:none;fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round}
.pic.err .snd{display:none}
.snd{position:absolute;top:10px;right:10px;z-index:4;display:inline-flex;align-items:center;gap:6px;min-height:40px;
  padding:0 13px;border-radius:999px;cursor:pointer;background:rgba(7,14,24,.72);-webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);border:1.5px solid rgba(255,255,255,.34);color:#fff;font-family:var(--head);font-weight:700;
  font-size:.92rem;line-height:1;white-space:nowrap;touch-action:manipulation}
.snd .i{margin:0;width:17px;height:17px;stroke-width:5}
.snd .i-on{display:none}
.pic.loud .snd .i-on{display:inline-block}
.pic.loud .snd .i-off{display:none}
.pic.loud .snd{border-color:rgba(255,255,255,.22);color:rgba(255,255,255,.85)}
@media(prefers-reduced-motion:no-preference){.pic.ready:not(.loud) .snd{animation:msSnd 1.7s ease-in-out 3}}
@keyframes msSnd{0%,100%{box-shadow:0 0 0 0 rgba(255,255,255,0)}50%{box-shadow:0 0 0 5px rgba(255,255,255,.2)}}
.pic .cap{position:absolute;left:10px;right:10px;bottom:10px;z-index:4;display:flex;align-items:center;
  justify-content:center;gap:9px;min-height:52px;padding:0 15px;border-radius:4px;text-decoration:none;
  background:var(--amber);color:var(--tarmac);font-family:var(--head);font-weight:700;font-size:1.12rem;white-space:nowrap;
  border:1px solid rgba(255,255,255,.22);box-shadow:0 8px 28px rgba(36,50,56,.22);touch-action:manipulation}
.pic .cap .i{margin:0;width:18px;height:18px}
.pic .cap:hover{background:#f2b331;color:var(--tarmac)}
.pic :focus-visible{outline:3px solid #fff;outline-offset:2px}
@media(min-width:900px){
  .hero{display:grid;grid-template-columns:minmax(0,1fr) min(38%,300px);gap:1.6rem;align-items:start}
  .hero .ans{margin-top:0}
  .pic{margin:0;width:100%;max-width:340px}
}
@media print{.pic{display:none}}

.network .netgrp{margin:.55rem 0 0;line-height:1.75}
.network .netgrp span{font-weight:600;margin-right:.25rem}
.network .netlist{margin:.2rem 0 .4rem}