/* ============================================================
   LUBRENZA — specialty lubrication & reliability
   Design system carried over from the printed collateral.
   ============================================================ */

:root{
  --navy:#071D35;
  --navy-l1:#12314F;
  --navy-l2:#1E3A5C;
  --teal:#00A6A6;
  --gold:#E5A900;
  --graphite:#343B43;
  --white:#F7F9FA;
  --t60:#9FB0C0;
  --t40:#C3CFDA;
  --rule:#DDE3E9;
  --alt:#EFF3F6;
  --teal-t10:#E5F5F5;
  --gold-t10:#FCF3DE;

  --sans:"Inter","Helvetica Neue",Helvetica,Arial,sans-serif;
  --mono:"IBM Plex Mono","SF Mono",Menlo,Consolas,monospace;

  --wrap:1200px;
  --gut:clamp(20px,5vw,64px);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
}
body{
  margin:0;background:var(--white);color:var(--graphite);
  font-family:var(--sans);font-size:16px;line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit}

.wrap{max-width:var(--wrap);margin:0 auto;padding-inline:var(--gut)}

/* ---------- type ---------- */
h1,h2,h3,h4{margin:0;color:var(--navy);line-height:1.15;letter-spacing:-.02em;font-weight:700}
h1{font-size:clamp(2.1rem,5.4vw,4rem)}
h2{font-size:clamp(1.6rem,3.4vw,2.6rem)}
h3{font-size:clamp(1.1rem,2vw,1.4rem)}
p{margin:0 0 1rem}
.lede{font-size:clamp(1.05rem,1.8vw,1.28rem);line-height:1.6;color:var(--graphite);max-width:62ch}

/* the eyebrow is the one recurring structural device: it labels, never decorates */
.eyebrow{
  font-family:var(--mono);font-size:.7rem;font-weight:600;
  letter-spacing:.22em;text-transform:uppercase;color:var(--teal);
  display:flex;align-items:center;gap:.75rem;margin-bottom:1rem;
}
.eyebrow::after{content:"";flex:1;height:1px;background:var(--rule);max-width:120px}
.eyebrow.on-dark{color:var(--teal)}
.eyebrow.on-dark::after{background:var(--navy-l2)}
.eyebrow.centred{justify-content:center}
.eyebrow.centred::before{content:"";flex:1;height:1px;background:var(--rule);max-width:80px}

.mono{font-family:var(--mono)}

/* ---------- header ---------- */
.site-head{
  position:sticky;top:0;z-index:60;background:var(--navy);
  border-bottom:3px solid var(--gold);
}
.head-in{display:flex;align-items:center;justify-content:space-between;gap:1.5rem;height:76px}
.brand img{height:34px;width:auto}
.nav{display:flex;gap:1.35rem;align-items:center}
.nav a{
  color:#fff;text-decoration:none;font-size:.78rem;white-space:nowrap;font-weight:500;
  letter-spacing:.1em;text-transform:uppercase;padding:.4rem 0;
  border-bottom:2px solid transparent;transition:border-color .18s,color .18s;
}
.nav a:hover,.nav a:focus-visible{border-bottom-color:var(--teal)}
.nav a[aria-current="page"]{border-bottom-color:var(--gold);color:#fff}
.nav-cta{
  background:var(--teal);color:var(--navy)!important;padding:.62rem 1.2rem!important;
  border-radius:3px;font-weight:700;border-bottom:none!important;
}
.nav-cta:hover{background:#00bcbc}
.burger{display:none;background:none;border:0;cursor:pointer;padding:.5rem;width:44px;height:44px}
.burger span{display:block;width:24px;height:2px;background:#fff;margin:5px auto;transition:.2s}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

@media(max-width:940px){
  .burger{display:block}
  .nav{
    position:fixed;inset:76px 0 auto 0;background:var(--navy);flex-direction:column;
    align-items:stretch;gap:0;padding:.5rem var(--gut) 1.5rem;
    border-bottom:3px solid var(--gold);
    transform:translateY(-140%);transition:transform .28s ease;
  }
  .nav[data-open="true"]{transform:translateY(0)}
  .nav a{padding:.95rem 0;border-bottom:1px solid var(--navy-l2)}
  .nav-cta{text-align:center;margin-top:1rem}
}

/* ---------- hero ---------- */
.hero{background:var(--navy);color:#fff;position:relative;overflow:hidden}
.hero::after{
  content:"";position:absolute;inset:auto 0 0 0;height:3px;
  background:linear-gradient(90deg,var(--teal) 0 33%,var(--gold) 33% 66%,var(--navy-l2) 66%);
}
.hero-in{padding:clamp(3.5rem,9vw,7rem) 0 clamp(3rem,7vw,5.5rem);position:relative;z-index:2}
.hero h1{color:#fff;max-width:19ch}
.hero .lede{color:var(--t40);margin-top:1.5rem}
.hero-sub{color:var(--t60);font-size:.95rem}

/* the signature element: a viscosity ladder that doubles as the hero graphic.
   each bar is a real ISO VG grade, width proportional to viscosity. */
.ladder{margin-top:3rem;display:grid;gap:5px;max-width:620px}
.ladder-row{display:grid;grid-template-columns:92px 1fr;align-items:center;gap:16px}
.ladder-row .g{font-family:var(--mono);font-size:.68rem;color:var(--t60);letter-spacing:.06em;white-space:nowrap}
.ladder-bar{height:9px;background:var(--navy-l2);position:relative;overflow:hidden;border-radius:1px}
.ladder-bar i{
  position:absolute;inset:0 100% 0 0;background:var(--teal);
  animation:fill 1.1s cubic-bezier(.22,.7,.3,1) forwards;
}
.ladder-row:nth-child(1) i{animation-delay:.05s}
.ladder-row:nth-child(2) i{animation-delay:.13s}
.ladder-row:nth-child(3) i{animation-delay:.21s}
.ladder-row:nth-child(4) i{animation-delay:.29s;background:var(--gold)}
.ladder-row:nth-child(5) i{animation-delay:.37s;background:var(--gold)}
@keyframes fill{to{right:var(--w)}}
@media (prefers-reduced-motion:reduce){.ladder-bar i{animation:none;right:var(--w)}}
.ladder-cap{margin-top:1.1rem;font-family:var(--mono);font-size:.68rem;letter-spacing:.14em;color:var(--t60);text-transform:uppercase}

/* ---------- sections ---------- */
.sec{padding:clamp(3.5rem,8vw,6.5rem) 0}
.sec-alt{background:var(--alt)}
.sec-navy{background:var(--navy);color:#fff}
.sec-navy h2,.sec-navy h3{color:#fff}
.sec-navy p{color:var(--t40)}
.sec-head{max-width:64ch;margin-bottom:3rem}

/* ---------- grid + cards ---------- */
.grid{display:grid;gap:1.4rem}
.g2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(255px,1fr))}
.g4{grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}

.card{
  background:#fff;border:1px solid var(--rule);border-radius:4px;
  padding:1.7rem 1.6rem;border-left:3px solid var(--gold);
}
.card h3{margin-bottom:.55rem}
.card p:last-child{margin-bottom:0}
.card p{font-size:.94rem;color:#4b5560}
.card.teal{border-left-color:var(--teal)}
.card.navy{background:var(--navy-l1);border-color:var(--navy-l2);color:#fff}
.card.navy h3{color:#fff}
.card.navy p{color:var(--t40)}

/* sector chips carry the same colour coding as the printed guide */
.chip{
  display:inline-block;font-family:var(--mono);font-size:.63rem;font-weight:600;
  letter-spacing:.14em;text-transform:uppercase;padding:.3rem .6rem;border-radius:2px;
}
.chip-FG{background:var(--teal-t10);color:#00716f}
.chip-OG,.chip-WR{background:var(--gold-t10);color:#8a6600}
.chip-MARINE{background:#E8EDF2;color:var(--navy)}
.chip-HT,.chip-EP,.chip-MWF,.chip-PROTECT{background:#EAECEE;color:var(--graphite)}

/* ---------- steps (a real sequence, so numbering earns its place) ---------- */
.steps{counter-reset:s;display:grid;gap:0}
.step{
  counter-increment:s;display:grid;grid-template-columns:auto 1fr;gap:1.5rem;
  padding:1.6rem 0;border-top:1px solid var(--rule);
}
.step:last-child{border-bottom:1px solid var(--rule)}
.step::before{
  content:counter(s,decimal-leading-zero);font-family:var(--mono);font-size:.8rem;
  font-weight:600;color:var(--teal);padding-top:.25rem;
}
.sec-navy .step{border-color:var(--navy-l2)}
.step h3{font-size:1.05rem;margin-bottom:.35rem}

/* ---------- catalogue ---------- */
.filters{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:1.4rem}
.filters button{
  font-family:var(--mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;
  padding:.55rem .95rem;border:1px solid var(--rule);background:#fff;color:var(--graphite);
  border-radius:2px;cursor:pointer;transition:.15s;
}
.filters button:hover{border-color:var(--teal);color:var(--navy)}
.filters button[aria-pressed="true"]{background:var(--navy);border-color:var(--navy);color:#fff}
.search{
  width:100%;max-width:380px;padding:.75rem 1rem;border:1px solid var(--rule);
  border-radius:2px;font-family:var(--sans);font-size:.95rem;margin-bottom:1.6rem;
}
.search:focus{outline:2px solid var(--teal);outline-offset:1px;border-color:var(--teal)}

.tbl-scroll{overflow-x:auto;border:1px solid var(--rule);border-radius:4px;background:#fff}
table{width:100%;border-collapse:collapse;font-size:.87rem;min-width:900px}
tbody td:nth-child(4),tbody td:nth-child(5),tbody td:nth-child(6){white-space:nowrap}
thead th{
  background:var(--navy);color:#fff;text-align:left;padding:.85rem .9rem;
  font-family:var(--mono);font-size:.66rem;letter-spacing:.13em;text-transform:uppercase;font-weight:600;
  position:sticky;top:0;
}
tbody td{padding:.8rem .9rem;border-top:1px solid var(--rule);vertical-align:top}
tbody tr:nth-child(even){background:var(--alt)}
tbody tr:hover{background:var(--teal-t10)}
td.code{font-family:var(--mono);font-weight:600;color:var(--navy);white-space:nowrap;font-size:.8rem}
.count{font-family:var(--mono);font-size:.72rem;color:#6b7680;letter-spacing:.08em;margin-bottom:1rem}
.empty{padding:3rem 1rem;text-align:center;color:#6b7680}

/* ---------- partner band ---------- */
.partners{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:1rem;margin-top:2rem}
.partner{
  background:#fff;border-radius:4px;padding:1.4rem 1rem;display:grid;place-items:center;min-height:96px;
}
.partner img{max-height:44px;width:auto}

/* ---------- CTA + buttons ---------- */
.btn{
  display:inline-block;background:var(--teal);color:var(--navy);text-decoration:none;
  font-weight:700;font-size:.87rem;letter-spacing:.06em;padding:.95rem 1.7rem;border-radius:3px;
  transition:background .18s,transform .18s;
}
.btn:hover{background:#00bcbc;transform:translateY(-1px)}
.btn-ghost{background:transparent;color:#fff;border:1px solid var(--t60)}
.btn-ghost:hover{background:rgba(255,255,255,.09);border-color:#fff}
.btn-row{display:flex;flex-wrap:wrap;gap:.85rem;margin-top:2rem}

/* ---------- contact ---------- */
.contact-grid{display:grid;grid-template-columns:1.3fr .7fr;gap:3rem;align-items:start}
@media(max-width:820px){.contact-grid{grid-template-columns:1fr}}
.cline{display:grid;grid-template-columns:104px 1fr;gap:1rem;padding:1rem 0;border-top:1px solid var(--navy-l2)}
.cline dt{font-family:var(--mono);font-size:.67rem;letter-spacing:.14em;text-transform:uppercase;color:var(--t60);padding-top:.2rem}
.cline dd{margin:0;font-size:1.05rem;color:#fff}
.cline dd a{color:#fff;text-decoration:none;border-bottom:1px solid var(--teal)}
.cline dd a:hover{color:var(--teal)}
.qr{background:#fff;padding:14px;border-radius:5px;width:190px}
.qr-cap{font-family:var(--mono);font-size:.63rem;letter-spacing:.15em;text-transform:uppercase;color:var(--t60);text-align:center;margin-top:.7rem}

/* ---------- footer ---------- */
.site-foot{background:var(--navy);color:var(--t60);padding:3.5rem 0 2rem;border-top:1px solid var(--navy-l2)}
.foot-top{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:2.5rem;padding-bottom:2.5rem;border-bottom:1px solid var(--navy-l2)}
@media(max-width:760px){.foot-top{grid-template-columns:1fr;gap:2rem}}
.foot-top img.fl{height:34px;margin-bottom:1.2rem}
.foot-top p{font-size:.9rem;color:var(--t60)}
.foot-col h4{font-family:var(--mono);font-size:.67rem;letter-spacing:.15em;text-transform:uppercase;color:#fff;margin-bottom:.9rem}
.foot-col a{display:block;color:var(--t60);text-decoration:none;font-size:.9rem;padding:.28rem 0}
.foot-col a:hover{color:var(--teal)}
.foot-bot{display:flex;flex-wrap:wrap;justify-content:space-between;gap:1rem;padding-top:1.6rem;font-size:.76rem}
.foot-bot .endorse{display:flex;align-items:center;gap:.6rem}
.foot-bot .endorse img{height:22px;opacity:.85}

:focus-visible{outline:2px solid var(--teal);outline-offset:2px}
.skip{position:absolute;left:-9999px}
.skip:focus{left:var(--gut);top:.5rem;z-index:99;background:var(--teal);color:var(--navy);padding:.7rem 1.1rem;border-radius:3px}

/* ============================================================
   GRADE SELECTOR
   ============================================================ */
#result,#inds{scroll-margin-top:96px}
.ind-grid{display:grid;gap:.9rem;grid-template-columns:repeat(auto-fit,minmax(268px,1fr))}
.ind{
  text-align:left;background:#fff;border:1px solid var(--rule);border-left:3px solid var(--teal);
  border-radius:4px;padding:1.3rem 1.4rem;cursor:pointer;font-family:var(--sans);
  transition:transform .16s,box-shadow .16s,border-left-color .16s;display:block;width:100%;
}
.ind:hover,.ind:focus-visible{
  transform:translateY(-2px);box-shadow:0 6px 18px rgba(7,29,53,.09);border-left-color:var(--gold);
}
.ind-n{display:block;font-size:1.02rem;font-weight:700;color:var(--navy);margin-bottom:.35rem;letter-spacing:-.01em}
.ind-b{display:block;font-size:.86rem;color:#6b7680;line-height:1.5}

.res-head{
  display:flex;justify-content:space-between;align-items:flex-start;gap:1.5rem;
  flex-wrap:wrap;margin-bottom:2rem;
}
.btn-back{
  background:none;border:1px solid var(--rule);border-radius:3px;padding:.6rem 1.1rem;
  cursor:pointer;font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;
  text-transform:uppercase;color:var(--graphite);white-space:nowrap;
}
.btn-back:hover{border-color:var(--teal);color:var(--navy)}

.pt{
  background:#fff;border:1px solid var(--rule);border-radius:4px;
  padding:1.4rem 1.5rem;margin-bottom:.8rem;border-left:3px solid var(--rule);
}
.pt.lead{border-left-color:var(--gold);background:var(--gold-t10)}
.pt-top{display:flex;justify-content:space-between;align-items:baseline;gap:1rem;flex-wrap:wrap}
.pt h3{font-size:1.02rem;margin:0}
.pt-grade{
  font-family:var(--mono);font-size:.74rem;font-weight:600;letter-spacing:.06em;
  background:var(--navy);color:#fff;padding:.42rem .8rem;border-radius:3px;white-space:nowrap;
}
.pt p{margin:.6rem 0 0;font-size:.9rem;color:#4b5560;max-width:74ch}
.pt-star{
  font-family:var(--mono);font-size:.63rem;letter-spacing:.14em;text-transform:uppercase;
  color:#8a6600;font-weight:700;display:block;margin-bottom:.4rem;
}
.res-cta{
  background:var(--navy);color:var(--t40);border-radius:5px;padding:2.2rem 2rem;margin-top:2rem;
}
.res-cta h3{color:#fff;margin-bottom:.6rem}
.res-cta p{font-size:.94rem;max-width:64ch}

/* ============================================================
   BREADCRUMB · SPEC TABLE · LEAD FORM
   ============================================================ */
.crumb{
  font-family:var(--mono);font-size:.72rem;letter-spacing:.06em;color:#6b7680;
  margin-bottom:1.6rem;display:flex;gap:.55rem;flex-wrap:wrap;align-items:center;
}
.crumb a{color:var(--teal);text-decoration:none}
.crumb a:hover{text-decoration:underline}
.crumb span{color:var(--t40)}

.spec{background:#fff;border:1px solid var(--rule);border-radius:4px;overflow:hidden}
.spec-row{display:grid;grid-template-columns:210px 1fr;gap:1rem;padding:1rem 1.5rem;border-top:1px solid var(--rule)}
.spec-row:first-child{border-top:0}
.spec-row:nth-child(even){background:var(--alt)}
.spec-row dt{
  font-family:var(--mono);font-size:.7rem;letter-spacing:.13em;text-transform:uppercase;
  color:#6b7680;margin:0;padding-top:.15rem;
}
.spec-row dd{margin:0;font-size:.98rem;color:var(--navy);font-weight:600}
@media(max-width:560px){
  .spec-row{grid-template-columns:1fr;gap:.3rem;padding:.9rem 1.1rem}
}

td.code a{color:var(--navy);text-decoration:none;border-bottom:1px solid var(--t40)}
td.code a:hover{color:var(--teal);border-bottom-color:var(--teal)}

.lform{background:#fff;border:1px solid var(--rule);border-radius:5px;padding:clamp(1.5rem,3.5vw,2.4rem)}
.lgrid{display:grid;gap:1.1rem;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.lform label{display:block;font-size:.82rem;font-weight:600;color:var(--navy);margin-bottom:0}
.lform label span{color:var(--teal)}
.lform input,.lform select,.lform textarea{
  width:100%;margin-top:.4rem;padding:.75rem .85rem;border:1px solid var(--rule);
  border-radius:3px;font-family:var(--sans);font-size:.95rem;color:var(--graphite);
  background:#fff;font-weight:400;
}
.lform input:focus,.lform select:focus,.lform textarea:focus{
  outline:2px solid var(--teal);outline-offset:1px;border-color:var(--teal);
}
.lform textarea{resize:vertical;min-height:96px}
.lfull{display:block;margin-top:1.1rem}
.lform button{margin-top:1.5rem;border:0;cursor:pointer;font-family:var(--sans)}
.lnote{font-size:.78rem;color:#6b7680;margin:.9rem 0 0}
.hp{position:absolute;left:-9999px}