:root{
  --bg:#0f1115; --panel:#171a21; --panel2:#1d2129; --line:#2a2f3a;
  --ink:#e6e9ef; --muted:#9aa3b2; --accent:#3b82f6; --accent2:#22d3ee;
  --marine:#2563eb; --industrial:#d97706; --both:#16a34a; --drive:#8b5cf6;
  --mono:"SFMono-Regular",ui-monospace,Consolas,Menlo,monospace;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.5 system-ui,Segoe UI,Roboto,sans-serif}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
header{display:flex;gap:18px;align-items:center;padding:12px 20px;background:var(--panel);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;font-size:17px;color:var(--ink);white-space:nowrap}
.brand:hover{text-decoration:none}
.brand img{display:block;flex:none}
.brand-text b{color:var(--accent2);font-weight:700}
.brand-text i{color:var(--muted);font-style:normal;font-weight:400}
.search{display:flex;flex:1;min-width:240px;max-width:640px;gap:8px;align-items:stretch}
.search input{flex:1;min-width:0;padding:9px 12px;background:var(--bg);border:1px solid var(--line);border-radius:6px 0 0 6px;color:var(--ink);font-size:14px}
.search button[type=submit]{padding:9px 16px;background:var(--accent);color:#fff;border:0;border-radius:0 6px 6px 0;cursor:pointer}
/* context scope toggle: [<engine> | All] segmented pill — only on an engine page */
.scope{display:inline-flex;align-items:center;gap:3px;padding:3px;background:var(--panel2);border:1px solid var(--line);border-radius:8px}
.scope[hidden]{display:none}
.scope button{border:0;background:transparent;color:var(--muted);font-size:12px;font-weight:600;padding:5px 11px;border-radius:6px;cursor:pointer;white-space:nowrap;max-width:130px;overflow:hidden;text-overflow:ellipsis;transition:background .12s,color .12s}
.scope button:hover{color:var(--ink)}
.scope button.on{background:var(--accent);color:#fff}
nav{display:flex;gap:16px}
nav a{color:var(--muted);font-size:14px}
main{max-width:1100px;margin:0 auto;padding:24px 20px 60px}
footer{max-width:1100px;margin:0 auto;padding:20px;color:var(--muted);font-size:12px;border-top:1px solid var(--line)}
footer a{color:var(--accent)}
.beer{margin-bottom:8px;font-size:13px;color:var(--ink)}
.beer a{font-weight:600;color:#fcd34d}
.beerbtn{display:inline-block;margin:6px 0;padding:10px 18px;border-radius:8px;font-weight:700;background:linear-gradient(180deg,#fbbf24,#f59e0b);color:#1a1200}
.beerbtn:hover{filter:brightness(1.06);text-decoration:none}
.prose{max-width:760px;line-height:1.6}
.prose h2{margin-top:24px}
.prose li{margin:4px 0}
/* owner guide pages (rendered Markdown) */
.guide{max-width:880px}
.guide h2,.guide h3{text-transform:none;color:var(--ink);letter-spacing:0}
.guide h2{font-size:18px;margin:22px 0 8px}
.guide h3{font-size:15px;margin:16px 0 6px}
.guide blockquote{border-left:3px solid var(--accent);margin:12px 0;padding:6px 0 6px 14px;color:var(--muted)}
.guide hr{border:0;border-top:1px solid var(--line);margin:18px 0}
.guide code{background:var(--panel2);border:1px solid var(--line);border-radius:4px;padding:1px 5px;font-family:var(--mono);font-size:.92em}
.guide .table-wrap{margin:14px 0}
.guide ul{padding-left:20px}

/* ---- mobile (≈50% of usage) ---- */
@media (max-width: 640px) {
  header{gap:8px 12px;padding:10px 12px}
  .brand{font-size:15px;gap:7px}
  .brand img{width:28px;height:28px}
  .search{order:2;flex:1 1 100%;max-width:none}
  nav{order:3;flex:1 1 100%;gap:16px;overflow-x:auto;white-space:nowrap;padding-bottom:2px;-webkit-overflow-scrolling:touch}
  main{padding:16px 12px 48px}
  footer{padding:18px 12px}
  h1{font-size:19px}
  h2{margin:20px 0 8px}
  .stat b{font-size:22px}
  .stats{gap:8px}
  .kv{grid-template-columns:104px 1fr}
  .asplabel{min-width:100%;margin-bottom:2px}
  .section{padding:13px}
  .specgrid{max-height:68vh}
  .specrow .gh,.specrow .gc{padding:7px 9px}
  .gridfilter{max-width:none}
}
.loading{color:var(--muted);padding:40px;text-align:center}
h1{font-size:22px;margin:0 0 4px}
h2{font-size:16px;margin:28px 0 10px;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.04em}
.sub{color:var(--muted);margin:0 0 20px}
.pn{font-family:var(--mono)}
.crumbs{font-size:13px;color:var(--muted);margin-bottom:14px}
.crumbs a{color:var(--muted)}

.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin:18px 0}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:14px}
.stat b{display:block;font-size:26px}
.stat span{color:var(--muted);font-size:13px}
a.stat{color:var(--ink)}
a.stat:hover{border-color:var(--accent);text-decoration:none}

.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}
.card{display:block;background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:14px;color:var(--ink)}
.card:hover{border-color:var(--accent);text-decoration:none}
.card h3{margin:0 0 4px;font-size:15px}
.card .meta{color:var(--muted);font-size:12px}

table{width:100%;border-collapse:collapse;font-size:14px;background:var(--panel);border:1px solid var(--line);border-radius:8px;overflow:hidden}
th,td{text-align:left;padding:8px 12px;border-bottom:1px solid var(--line)}
th{background:var(--panel2);color:var(--muted);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.03em}
tr:last-child td{border-bottom:0}
tr:hover td{background:var(--panel2)}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums}

.badge{display:inline-block;padding:2px 8px;border-radius:999px;font-size:11px;font-weight:600;vertical-align:middle}
.badge.marine{background:rgba(37,99,235,.18);color:#93c5fd}
.badge.industrial{background:rgba(217,119,6,.18);color:#fcd34d}
.badge.both{background:rgba(22,163,74,.18);color:#86efac}
.badge.drive{background:rgba(139,92,246,.18);color:#c4b5fd}
.fam{color:var(--accent2);font-weight:600;font-size:.9em}
.cta{display:block;margin:0 0 16px;padding:12px 16px;background:rgba(22,163,74,.12);border:1px solid var(--both);border-radius:8px;color:#86efac;font-weight:600}
.cta:hover{background:rgba(22,163,74,.2);text-decoration:none}
.cta.xref{background:rgba(59,130,246,.12);border-color:var(--accent);color:#93c5fd}
.cta.xref:hover{background:rgba(59,130,246,.2)}
.conf{display:inline-block;padding:1px 8px;border-radius:999px;font-size:11px;font-weight:600}
.conf.unverified{background:rgba(217,119,6,.18);color:#fcd34d}
.conf.likely{background:rgba(59,130,246,.18);color:#93c5fd}
.conf.confirmed{background:rgba(22,163,74,.18);color:#86efac}
/* Featured (owner-recommended) aftermarket brand — floats to top of the list, gold accent */
tr.featured td{background:rgba(245,158,11,.12)}
tr.featured:hover td{background:rgba(245,158,11,.2)}
tr.featured td.pn{border-left:3px solid #f59e0b}
.feat-badge{display:inline-block;margin-left:6px;padding:1px 8px;border-radius:999px;font-size:11px;font-weight:700;background:linear-gradient(180deg,#fbbf24,#f59e0b);color:#1a1200;white-space:nowrap}
/* owner-facing guidance callout on a part page (oil/fuel filter explainers, etc.) */
.notebox{background:rgba(59,130,246,.10);border:1px solid var(--accent);border-radius:8px;padding:12px 14px;margin:0 0 16px}
.notebox b{display:block;color:#93c5fd;font-size:12px;text-transform:uppercase;letter-spacing:.03em;margin-bottom:4px}
.notebox p{margin:0;font-size:14px}
.badge.code{background:var(--panel2);color:var(--muted);font-family:var(--mono);font-weight:500}
.tag{display:inline-block;padding:1px 6px;border:1px solid var(--line);border-radius:4px;font-size:11px;color:var(--muted)}

.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch}
/* Models spec "table" as a CSS grid so the header row can be a sticky <div>
   (sticky on <thead>/<th> is unsupported in some engines; on a block it is not). */
.specgrid{overflow:auto;max-height:72vh;border:1px solid var(--line);border-radius:8px;font-size:14px}
.specrow{display:grid;grid-template-columns:var(--cols)}
.specrow .gh,.specrow .gc{padding:8px 12px;border-bottom:1px solid var(--line);min-width:0;overflow-wrap:anywhere}
.specrow .num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}
.specrow .nowrap{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.gridhead{position:sticky;top:0;z-index:2;background:var(--panel2)}
.gridhead .gh{color:var(--muted);font-size:12px;font-weight:600;text-transform:uppercase;letter-spacing:.03em;white-space:nowrap}
.specrow:not(.gridhead):hover{background:var(--panel2)}
.specrow:last-child .gc{border-bottom:0}
.lev2{padding-left:22px}
.lev3{padding-left:42px}
.lev4{padding-left:62px}
.lev2::before,.lev3::before,.lev4::before{content:"└ ";color:var(--muted)}
.sup{color:var(--industrial);font-weight:600}
.muted{color:var(--muted)}
.right{text-align:right}
.nowrap{white-space:nowrap}
.empty{color:var(--muted);padding:30px;text-align:center;background:var(--panel);border:1px dashed var(--line);border-radius:8px}
.pill-row{display:flex;flex-wrap:wrap;gap:6px;margin:6px 0}
.chip{background:var(--panel2);border:1px solid var(--line);border-radius:6px;padding:4px 10px;font-size:13px}
.chip.marine{border-left:3px solid var(--marine)}
.chip.industrial{border-left:3px solid var(--industrial)}
.asplabel{align-self:center;min-width:150px;color:var(--muted);font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.04em}
.gridfilter-row{display:flex;align-items:center;gap:10px;margin:0 0 8px}
.gridfilter{flex:1;max-width:420px;padding:8px 12px;background:var(--bg);border:1px solid var(--line);border-radius:6px;color:var(--ink);font-size:14px}
.gridfilter-row .muted{font-size:12px;white-space:nowrap}
.section{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:16px;margin-bottom:16px}
.kv{display:grid;grid-template-columns:140px 1fr;gap:6px 14px;font-size:14px}
.kv dt{color:var(--muted)}
.kv dd{margin:0}
.hl{background:rgba(59,130,246,.25);border-radius:3px}

/* ---- monetization: affiliate buttons, ad slot, Ellebogen recommendation ---- */
.aff{margin:18px 0}
.aff h2{text-transform:none;color:var(--ink);font-size:15px;letter-spacing:0}
.aff-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:0 0 8px}
.aff-btn{display:inline-flex;align-items:center;gap:6px;padding:9px 14px;border-radius:8px;font-weight:600;font-size:14px;border:1px solid var(--line);background:var(--panel2);color:var(--ink)}
.aff-btn:hover{text-decoration:none;border-color:var(--accent)}
.aff-amazon{color:#ffb454;border-color:rgba(255,153,0,.45)}
.aff-ebay{color:#7aa9ff;border-color:rgba(0,100,210,.5)}
.aff-aliexpress{color:#ff7a63;border-color:rgba(230,46,4,.5)}
.aff-alibaba{color:#ff9a4d;border-color:rgba(255,106,0,.5)}
.aff-disclosure{color:var(--muted);font-size:11.5px;margin:4px 0 0;max-width:760px}
.aff-xs{display:inline-flex;flex-direction:row;gap:4px;flex-wrap:wrap}
.aff-xs a{display:inline-block;padding:2px 5px;border-radius:4px;font-size:11px;font-weight:600;border:1px solid var(--line);background:var(--panel2);white-space:nowrap}
.aff-xs a:hover{text-decoration:none;border-color:var(--accent)}
.aff-xs .aff-amazon{color:#ffb454;border-color:rgba(255,153,0,.35)}
.aff-xs .aff-ebay{color:#7aa9ff;border-color:rgba(0,100,210,.35)}
.aff-xs .aff-aliexpress{color:#ff7a63;border-color:rgba(230,46,4,.35)}

/* small, clearly-labelled, non-intrusive ad slot (reserved space) */
.ad-slot{margin:22px 0;text-align:center}
.ad-label{display:block;color:var(--muted);font-size:10px;text-transform:uppercase;letter-spacing:.08em;margin-bottom:4px}
.ad-box{min-height:90px;max-width:728px;margin:0 auto;border:1px dashed var(--line);border-radius:8px}

/* Ellebogen — compact recommendation button (free, not affiliate) */
.ell-rec{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin:14px 0}
.ell-btn-sm{display:inline-flex;align-items:center;gap:6px;padding:9px 14px;border-radius:8px;font-weight:600;font-size:14px;border:1px solid #f59e0b;background:var(--panel2);color:#fcd34d}
.ell-btn-sm:hover{text-decoration:none;background:rgba(245,158,11,.1)}
.ell-rec-tag{font-size:11px;font-weight:700;color:#fcd34d;letter-spacing:.02em}

/* turbo-only Alibaba highlight (B2B aftermarket turbos) */
.turbo-cta{background:rgba(255,106,0,.08);border:1px solid #ff6a00;border-radius:10px;padding:14px 16px;margin:18px 0}
.turbo-cta h2{margin:0 0 6px;color:var(--ink);text-transform:none;font-size:15px;letter-spacing:0}
.turbo-cta p{margin:0 0 10px;font-size:14px}
.turbo-badge{display:inline-block;margin-bottom:6px;padding:1px 8px;border-radius:999px;font-size:11px;font-weight:700;background:#ff6a00;color:#1a1200}

/* ---- efficient engine/part layout: spec chips, button row, 2-col band ---- */
.spec-chips{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0 6px}
.spec-chip{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:6px 12px;line-height:1.15}
.spec-chip b{display:block;font-size:15px}
.spec-chip span{color:var(--muted);font-size:11px;text-transform:uppercase;letter-spacing:.03em}
.btn-row{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:0 0 18px}
.btn{display:inline-flex;align-items:center;gap:6px;padding:9px 14px;border-radius:8px;font-weight:600;font-size:14px;border:1px solid var(--line);background:var(--panel2);color:var(--ink)}
.btn:hover{text-decoration:none;border-color:var(--accent)}
.btn b{font-weight:700}
.btn.spec{border-color:var(--accent2);color:#a5f3fc}
.btn.save{border-color:var(--both);color:#86efac}
.btn.xref{border-color:var(--accent);color:#93c5fd}
/* two-column band (affiliate beside Ellebogen); collapses to 1 col when narrow or single */
.cols2{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px;align-items:start;margin:0 0 8px}
.cols2 .aff,.cols2 .ellebogen,.cols2 .turbo-cta{margin:0}
/* assemblies header with an inline per-engine part finder (no second big search bar) */
.asm-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px 16px;flex-wrap:wrap;margin:22px 0 10px}
.asm-head h2{margin:0}
.engine-search.mini{margin:0;max-width:340px;flex:1 1 240px}
.engine-search.mini input{font-size:13px;padding:7px 10px}
.engine-search.mini button{padding:7px 12px;font-size:13px}

/* ---- feedback section + modal (Report an Error / Confirm Fitment) ---- */
.fb-section{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:24px 0 10px;padding:12px 16px;background:var(--panel);border:1px solid var(--line);border-radius:10px}
.fb-label{font-size:13px;color:var(--muted);flex:1 1 auto}
.fb-btn{padding:7px 14px;border-radius:8px;font-size:13px;font-weight:600;border:1px solid var(--line);background:var(--panel2);color:var(--ink);cursor:pointer;transition:border-color .15s}
.fb-btn:hover{border-color:var(--accent)}
.fb-fitment{border-color:rgba(37,99,235,.5);color:#93c5fd}
.fb-fits-another{border-color:rgba(22,163,74,.4);color:#86efac}
.fb-fits-another:hover{border-color:var(--both)}
.fb-fitment:hover{border-color:var(--marine)}
.fb-error{border-color:rgba(239,68,68,.4);color:#fca5a5}
.fb-error:hover{border-color:#ef4444}
/* overlay */
.fb-overlay{position:fixed;inset:0;background:rgba(0,0,0,.6);display:flex;align-items:center;justify-content:center;z-index:900}
.fb-overlay[hidden]{display:none}
.fb-dialog{background:var(--panel2);border:1px solid var(--line);border-radius:14px;padding:24px;max-width:480px;width:calc(100% - 32px);position:relative}
.fb-close{position:absolute;top:10px;right:12px;background:none;border:none;font-size:20px;line-height:1;color:var(--muted);cursor:pointer;padding:4px 8px;border-radius:6px}
.fb-close:hover{color:var(--ink);background:var(--panel)}
.fb-dialog h3{margin:0 0 4px;font-size:17px}
.fb-part-no{margin:0 0 6px;font-size:13px}
.fb-textarea{width:100%;box-sizing:border-box;background:var(--bg);border:1px solid var(--line);border-radius:8px;color:var(--ink);padding:10px;font-size:14px;font-family:inherit;resize:vertical;min-height:90px;margin:0 0 12px;display:block}
.fb-textarea:focus{outline:none;border-color:var(--accent)}
.fb-result{padding:8px 12px;border-radius:8px;font-size:13px;margin:0 0 12px}
.fb-result.fb-ok{background:rgba(74,222,128,.1);border:1px solid #4ade80;color:#4ade80}
.fb-result.fb-err{background:rgba(239,68,68,.1);border:1px solid #ef4444;color:#fca5a5}
.fb-actions{display:flex;gap:8px;flex-wrap:wrap}
.fb-submit{background:var(--accent);color:#fff;border-color:var(--accent)!important}
.fb-submit:hover{opacity:.88}
.fb-submit:disabled{opacity:.45;cursor:not-allowed}