:root{
  --navy:#0b2545; --navy2:#13315c; --blue:#1f6feb; --blue-d:#1559c0;
  --accent:#ff7a18; --accent-d:#e85f00; --ink:#1a2330; --muted:#5b6b80;
  --line:#e3e8ef; --bg:#f6f8fb; --card:#fff;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.55}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
img{max-width:100%;display:block}

/* header */
.site-head{background:var(--navy);color:#fff;position:sticky;top:0;z-index:50;box-shadow:0 1px 0 rgba(0,0,0,.2)}
.head-inner{display:flex;align-items:center;gap:18px;height:64px}
.brand{color:#fff;font-weight:800;font-size:1.45rem;letter-spacing:.5px}
.brand:hover{text-decoration:none}
.brand span{color:var(--accent)}
.mainnav{display:flex;gap:18px;margin-left:14px;flex:1;flex-wrap:wrap}
.mainnav a{color:#cdd9ec;font-weight:600;font-size:.95rem}
.mainnav a:hover{color:#fff;text-decoration:none}
.callbtn{background:var(--accent);color:#fff;font-weight:700;padding:9px 16px;border-radius:8px;white-space:nowrap}
.callbtn:hover{background:var(--accent-d);text-decoration:none}

/* hero */
.hero{background:linear-gradient(160deg,var(--navy),var(--navy2));color:#fff;padding:60px 0 54px}
.hero h1{font-size:2.4rem;margin:0 0 14px;line-height:1.15}
.lede{font-size:1.15rem;color:#dce6f5;max-width:760px;margin:0 0 26px}
.herobtn{display:inline-block;background:var(--accent);color:#fff;font-weight:700;padding:13px 24px;
  border-radius:9px;margin-right:12px}
.herobtn:hover{background:var(--accent-d);text-decoration:none}
.herobtn.ghost{background:transparent;border:2px solid #5b7aa6;padding:11px 22px}
.herobtn.ghost:hover{background:rgba(255,255,255,.08)}

/* category rows on home */
.cat-row{padding:38px 0 8px;border-bottom:1px solid var(--line)}
.cat-row-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px}
.cat-row h2,.why h2{font-size:1.5rem;margin:0}
.seeall{font-weight:600;white-space:nowrap}
.cat-blurb{color:var(--muted);margin:6px 0 18px;max-width:760px}

/* grid + cards */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:18px;margin:8px 0 12px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden;
  display:flex;flex-direction:column;transition:box-shadow .15s,transform .15s;color:var(--ink)}
.card:hover{box-shadow:0 8px 24px rgba(11,37,69,.12);transform:translateY(-2px);text-decoration:none}
.card-img{aspect-ratio:1/1;background:#fff;display:flex;align-items:center;justify-content:center;padding:14px}
.card-img img{max-height:100%;width:auto;object-fit:contain}
.card-body{padding:14px;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:6px;flex:1}
.card-name{font-weight:700;font-size:.98rem;line-height:1.3}
.card-sku{color:var(--muted);font-size:.82rem}
.card-cta{color:var(--blue);font-weight:600;font-size:.9rem;margin-top:auto}

/* why */
.why{padding:40px 0 10px}
.why ul{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}
.why li{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px}

/* page title / crumbs */
.page-title{font-size:1.9rem;margin:18px 0 6px}
.crumbs{color:var(--muted);font-size:.9rem;margin:18px 0 0}
.crumbs a{color:var(--muted)}

/* product page */
.product{padding-bottom:40px}
.product-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:36px;margin-top:18px}
.main-img{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px;
  aspect-ratio:1/1;display:flex;align-items:center;justify-content:center}
.main-img img{max-height:100%;width:auto;object-fit:contain}
.thumbs{display:flex;gap:10px;margin-top:12px;flex-wrap:wrap}
.thumb{width:64px;height:64px;object-fit:contain;background:#fff;border:1px solid var(--line);
  border-radius:8px;padding:5px;cursor:pointer}
.thumb.active{border-color:var(--blue);box-shadow:0 0 0 2px rgba(31,111,235,.25)}
.product-info h1{font-size:1.7rem;margin:0 0 6px;line-height:1.2}
.sku{color:var(--muted);font-weight:600;margin-bottom:18px}
.buybox{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px;margin-bottom:20px}
.buynote{color:var(--muted);font-size:.86rem;margin-top:10px}
.desc{color:#2b3b50;line-height:1.65}
.help{margin-top:22px;padding:14px 16px;background:#eef4ff;border:1px solid #d4e2ff;border-radius:10px;font-size:.95rem}

/* buy button */
.buy{display:inline-block;background:var(--accent);color:#fff;font-weight:800;padding:11px 20px;
  border-radius:9px;letter-spacing:.2px}
.buy:hover{background:var(--accent-d);text-decoration:none}
.buy.big{display:block;text-align:center;font-size:1.12rem;padding:15px 20px}

/* footer */
.site-foot{background:var(--navy);color:#cdd9ec;margin-top:40px}
.foot-inner{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;padding:26px 20px}
.site-foot a{color:#fff}
.foot-note{color:#9fb2cd;font-size:.9rem;max-width:360px}

@media(max-width:760px){
  .product-grid{grid-template-columns:1fr;gap:20px}
  .hero h1{font-size:1.9rem}
  .mainnav{display:none}
}

/* ---- v2 additions ---- */
.sec-title{font-size:1.5rem;margin:34px 0 16px}
.muted{color:var(--muted)}
.catgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px}
.catcard{background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden;color:var(--ink);
  display:flex;flex-direction:column;transition:box-shadow .15s,transform .15s}
.catcard:hover{box-shadow:0 8px 24px rgba(11,37,69,.12);transform:translateY(-2px);text-decoration:none}
.catcard-img{aspect-ratio:4/3;background:#fff;display:flex;align-items:center;justify-content:center;padding:14px}
.catcard-img img{max-height:100%;width:auto;object-fit:contain}
.catcard-name{padding:12px 14px;font-weight:700;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:8px}
.catcard-name span{background:#eef2f7;color:var(--muted);border-radius:20px;padding:1px 10px;font-size:.82rem;font-weight:700}
.card-foot{margin-top:auto;padding-top:4px}
.pill{display:inline-block;font-size:.74rem;font-weight:700;padding:2px 9px;border-radius:20px}
.buy-pill{background:#e7f6ec;color:#1c7a3e}
.call-pill{background:#fff1e6;color:#c0560a}
.call{display:inline-block;background:var(--navy);color:#fff;font-weight:800;padding:11px 20px;border-radius:9px}
.call:hover{background:#13315c;text-decoration:none}
.call.big{display:block;text-align:center;font-size:1.12rem;padding:15px 20px}
.notfound{padding:30px 0 50px;max-width:900px}
.notfound h1{font-size:2rem;margin:0 0 12px}

/* ---- exploded parts diagram + number badges ---- */
.diagram{margin:18px 0 8px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:20px}
.diagram .sec-title{margin-top:0}
.diagram-img{position:relative;display:block;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff}
.diagram-img img{width:100%;height:auto;display:block;max-height:640px;object-fit:contain;background:#fff}
.diagram-zoom{position:absolute;right:12px;bottom:12px;background:rgba(11,37,69,.85);color:#fff;font-weight:700;
  font-size:.82rem;padding:6px 12px;border-radius:20px}
.diagram-img:hover .diagram-zoom{background:var(--accent)}
.card-img{position:relative}
.numbadge{position:absolute;top:8px;left:8px;z-index:1;min-width:24px;height:24px;padding:0 6px;border-radius:13px;
  background:var(--navy);color:#fff;font-weight:800;font-size:.82rem;display:flex;align-items:center;justify-content:center;
  box-shadow:0 1px 4px rgba(0,0,0,.25)}

/* ---- interactive diagram hotspots + part-page reference ---- */
.diagram-map{position:relative;display:block;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff}
.diagram-map img{width:100%;height:auto;display:block}
.hot{position:absolute;transform:translate(-50%,-50%);width:clamp(20px,3.2%,32px);aspect-ratio:1;border-radius:50%;
  background:rgba(31,111,235,.92);color:#fff;font-weight:800;font-size:clamp(10px,1.5vw,14px);line-height:1;
  display:flex;align-items:center;justify-content:center;border:2px solid #fff;box-shadow:0 1px 4px rgba(0,0,0,.45);text-decoration:none}
.hot:hover,.hot:focus{background:var(--accent);transform:translate(-50%,-50%) scale(1.35);z-index:6;text-decoration:none}
.diagram-enlarge{display:inline-block;margin-top:12px;font-weight:700}
.card{scroll-margin-top:86px}
.card:target{box-shadow:0 0 0 3px var(--accent),0 8px 24px rgba(11,37,69,.18)}
.diagram-ref{display:flex;gap:14px;align-items:center;background:#eef4ff;border:1px solid #d4e2ff;border-radius:10px;
  padding:12px 14px;margin:0 0 20px;color:var(--ink)}
.diagram-ref:hover{text-decoration:none;border-color:var(--blue)}
.diagram-ref img{width:88px;height:66px;object-fit:contain;background:#fff;border:1px solid var(--line);border-radius:6px;flex:none}
.diagram-ref span{font-size:.92rem;line-height:1.45}