/* ============================================================
   lubricants.jingyuan.hk — Style "Precision Engineering White · Gold"
   Base structure ported from fuel.jingyuan.hk style.css (V1.8)
   Design tokens: warm light base #FCFAF3 + bright gold #FFB300
   Fonts: Space Grotesk (head) / Inter (body) / JetBrains Mono (data)
   ============================================================ */
:root{
  --bg:#FCFAF3; --bg-alt:#F6F0DF; --surface:#FFFFFF;
  --ink:#221C0C; --ink-dim:#57503C; --ink-sub:#6B6450;
  --line:#EDE4CC; --line-strong:#DDD0AC;
  --acc:#FFB300;            /* bright lubricant gold (fills, buttons) */
  --acc-lt:#FFC94D;         /* lighter gold (hover, highlights) */
  --acc-text:#9A5B00;       /* readable gold for text on light bg (AA-compliant) */
  --acc-deep:#8A5600;       /* deep gold (hover states) */
  --acc-dim:rgba(255,179,0,.10);
  --gold:var(--acc-text);
  --gold-bright:#FFC94D;
  --gold-deep:#8A5600;
  --gold-dim:#FFF6DE;
  --gold-border:#F2E2B8;
  --dark:#241C08; --dark-2:#2E250F;
  --ok:#0E9F6E; --warn:#B45309;
  --font-head:'Space Grotesk',system-ui,sans-serif;
  --font-body:'Inter',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,monospace;
  --radius:12px;
  --shadow-sm:0 1px 3px rgba(60,45,10,.06);
  --shadow-md:0 10px 30px rgba(255,179,0,.14);
  color-scheme:light;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:var(--font-body);line-height:1.65;-webkit-font-smoothing:antialiased;font-size:16px}
img{max-width:100%;display:block}
a{color:var(--acc-text)}
.wrap{max-width:1160px;margin:0 auto;padding:0 32px}
@media(max-width:720px){.wrap{padding:0 18px}}
section{padding:72px 0}
.bg-alt{background:var(--bg-alt);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
h2{font-family:var(--font-head);font-size:clamp(25px,3.2vw,37px);font-weight:700;letter-spacing:-.015em;line-height:1.15;margin-bottom:12px;color:var(--ink)}
h3{font-family:var(--font-head)}

/* ---------- Header ---------- */
.site-head{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.93);backdrop-filter:blur(10px);border-bottom:2px solid var(--acc)}
.head-inner{position:relative;display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:72px;flex-wrap:nowrap;padding-top:8px;padding-bottom:8px}
.brand{display:flex;align-items:center;gap:11px;text-decoration:none;color:var(--ink)}
.brand-logo{height:56px;width:auto;display:block}
@media(max-width:720px){.brand-logo{height:44px}}
.brand-name{font-family:var(--font-head);font-weight:700;font-size:17px;letter-spacing:-.01em;line-height:1.2}
.brand-name small{display:block;font-family:var(--font-mono);font-weight:500;font-size:10.5px;color:var(--acc-text);letter-spacing:.12em;text-transform:uppercase;margin-top:1px}
.main-nav{display:flex;align-items:center;gap:2px;flex-wrap:nowrap}
.main-nav a{color:var(--ink-dim);text-decoration:none;font-size:13px;font-weight:500;padding:8px 10px;border-radius:8px;transition:.18s;white-space:nowrap}
.main-nav a:hover{color:var(--acc-text);background:var(--acc-dim)}
.main-nav a.nav-cta{background:var(--acc);color:#241A02;font-weight:700;padding:9px 14px}
.main-nav a.nav-cta:hover{background:var(--acc-lt);color:#241A02}

/* ---------- Hero (light, fuel-style, same photo) ---------- */
.hero{position:relative;padding:72px 0 76px;overflow:hidden;background:var(--bg)}
.hero-grid-bg{position:absolute;inset:0;background-image:linear-gradient(var(--acc-dim) 1px,transparent 1px),linear-gradient(90deg,var(--acc-dim) 1px,transparent 1px);background-size:56px 56px;-webkit-mask-image:radial-gradient(ellipse 75% 70% at 50% 30%,#000 20%,transparent 100%);mask-image:radial-gradient(ellipse 75% 70% at 50% 30%,#000 20%,transparent 100%);pointer-events:none}
.hero-photo{position:absolute;top:0;right:0;bottom:0;width:56%;background:url('../img/scenes/hero-lubricant-facility-9735.webp') 55% center/cover no-repeat;opacity:.92;-webkit-mask-image:linear-gradient(90deg,transparent 0%,#000 55%);mask-image:linear-gradient(90deg,transparent 0%,#000 55%);pointer-events:none}
@media(max-width:1080px){.hero-photo{opacity:.25;-webkit-mask-image:linear-gradient(180deg,transparent 0%,#000 35%,#000 100%);mask-image:linear-gradient(180deg,transparent 0%,#000 35%,#000 100%);width:100%}}
.hero::before{content:'';position:absolute;top:0;left:0;width:50%;height:100%;background:linear-gradient(90deg,rgba(255,179,0,.07) 0%,transparent 100%);pointer-events:none}
.hero .wrap{position:relative}
.kicker{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--acc-text);margin-bottom:22px}
.kicker::before{content:'';width:26px;height:2px;background:var(--acc)}
.hero h1{font-family:var(--font-head);font-size:clamp(33px,5vw,56px);line-height:1.08;letter-spacing:-.02em;font-weight:700;max-width:840px;margin-bottom:20px;color:var(--ink)}
.hero h1 em{color:var(--acc-text);font-style:normal}
.hero .sub{font-size:17px;color:var(--ink-dim);max-width:660px;margin-bottom:10px}
.hero-body{font-size:15.5px;color:var(--ink-dim);max-width:700px;margin-bottom:18px;line-height:1.7}

/* ---------- Direct Answer block ---------- */
.ai-block{background:var(--gold-dim);border-left:4px solid var(--acc);border-radius:0 10px 10px 0;padding:18px 22px;margin:6px 0 22px}
.ai-block .ab-label{font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--acc-text);margin-bottom:8px}
.ai-block p{font-size:15px;color:var(--ink);line-height:1.65}

/* ---------- Chips ---------- */
.chip-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:20px}
.chip{font-family:var(--font-mono);font-size:12px;padding:6px 13px;border-radius:99px;background:var(--acc-dim);color:var(--acc-text);border:1px solid transparent;font-weight:500}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:26px}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:9px;padding:15px 30px;border-radius:var(--radius);font-size:15px;font-weight:600;text-decoration:none;cursor:pointer;border:none;font-family:var(--font-body);transition:.22s}
.btn-pri{background:var(--acc);color:#241A02;box-shadow:0 6px 20px rgba(255,179,0,.35);font-weight:700}
.btn-pri:hover{background:var(--acc-lt);transform:translateY(-2px)}
.btn-ghost{background:transparent;color:var(--ink);border:1.5px solid var(--line-strong)}
.btn-ghost:hover{border-color:var(--acc);color:var(--acc-text)}
.bg-dark .btn-ghost{border-color:rgba(255,201,77,.55);color:var(--gold-bright)}
.bg-dark .btn-ghost:hover{background:rgba(255,179,0,.10)}

/* ---------- Hero stats ---------- */
.hero-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line-strong);border:1px solid var(--line-strong);border-radius:var(--radius);overflow:hidden;max-width:980px;margin-top:44px}
.hstat{background:rgba(255,255,255,.78);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);padding:22px 18px;text-align:center}
.hstat-num{font-family:var(--font-mono);font-size:24px;font-weight:500;color:var(--acc-text);line-height:1.25}
.hstat-num small{font-size:14px}
.hstat-label{font-size:12.5px;color:var(--ink-dim);margin-top:4px}
@media(max-width:800px){.hero-stats{grid-template-columns:repeat(2,1fr)}.hstat{padding:18px 10px}.hstat-num{font-size:19px}}

/* ---------- Section heads ---------- */
.sec-head{margin-bottom:40px}
.sec-label{display:block;font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--acc-text);margin-bottom:12px}
.sec-desc{margin-top:12px;color:var(--ink-dim);max-width:680px;font-size:15.5px}

/* ---------- Cards ---------- */
.grid{display:grid;gap:16px}
.grid-2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.grid-3{grid-template-columns:repeat(auto-fit,minmax(270px,1fr))}
.grid-4{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm);transition:.22s}
.card:hover{border-color:var(--acc);box-shadow:var(--shadow-md)}
.card h3{font-size:16.5px;margin-bottom:8px;font-weight:600}
.card p{font-size:13.5px;color:var(--ink-dim)}
.card .card-tag{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--acc-text);display:block;margin-bottom:8px}
.card a.card-link{display:inline-block;margin-top:14px;font-weight:600;font-size:13px;text-decoration:none;color:var(--acc-text)}
.card a.card-link:hover{text-decoration:underline}
.card-gold{border-top:3px solid var(--acc)}
.prod-rank{border-left:4px solid var(--acc)}
.rank-no{font-family:var(--font-mono);font-size:11px;color:var(--acc-text);letter-spacing:.12em;font-weight:500;display:block;margin-bottom:8px}

/* ---------- Flow / process diagram ---------- */
.flow-line{display:flex;flex-wrap:wrap;align-items:stretch;gap:0;justify-content:center;margin:26px 0}
.flow-step{flex:1;min-width:150px;background:var(--surface);border:1px solid var(--line);padding:16px 14px;text-align:center;position:relative;border-radius:10px;margin:0 30px 12px 0;box-shadow:var(--shadow-sm)}
.flow-step:last-child{margin-right:0}
.flow-step.hl{background:var(--gold-dim);border-color:var(--acc);border-width:2px}
.flow-step .fs-name{font-family:var(--font-head);font-weight:600;font-size:15px}
.flow-step .fs-sub{font-size:12px;color:var(--ink-sub);margin-top:4px}
.flow-step .fs-num-label{font-family:var(--font-head);font-weight:700;font-size:19px;color:var(--acc-text);letter-spacing:-.01em}
.flow-step::after{content:"→";position:absolute;right:-26px;top:50%;transform:translateY(-50%);color:var(--acc);font-size:1.1rem;font-weight:700}
.flow-step:last-child::after{content:""}
@media (max-width:700px){.flow-step{margin-right:0}.flow-step::after{content:"↓";right:50%;top:auto;bottom:-24px;transform:translateX(50%)}}

/* ---------- Tables ---------- */
.table-wrap{overflow-x:auto;margin:22px 0;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow-sm);background:var(--surface)}
table.data{width:100%;border-collapse:collapse;font-size:14px;background:var(--surface)}
table.data th,table.data td{border-bottom:1px solid var(--line);padding:13px 20px;text-align:left;vertical-align:top}
table.data th{font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--acc-text);font-weight:500;background:var(--gold-dim);white-space:nowrap}
table.data tr:last-child td{border-bottom:none}
table.data td b{color:var(--ink)}

/* ---------- Note / callout ---------- */
.note{background:var(--gold-dim);border-left:3px solid var(--acc);border-radius:0 8px 8px 0;padding:16px 20px;margin:22px 0;font-size:14px;color:var(--ink-dim)}
.note b{color:var(--ink)}
.note a,.ai-block a{color:var(--acc-deep);font-weight:600}
.note-warn{background:#FFF6DE;border-left-color:var(--acc-deep)}
.tick-list{list-style:none;margin:14px 0}
.tick-list li{padding-left:26px;position:relative;margin-bottom:9px;font-size:14px;color:var(--ink-dim)}
.tick-list li::before{content:"✓";position:absolute;left:0;top:0;color:var(--ok);font-weight:700}

/* ---------- Breadcrumb & page hero (inner pages) ---------- */
.crumbs{font-family:var(--font-mono);font-size:12px;color:var(--ink-sub);margin-bottom:18px}
.crumbs a{color:var(--ink-dim);text-decoration:none}
.crumbs a:hover{color:var(--acc-text)}
.page-hero{padding:64px 0 54px;position:relative;overflow:hidden;background:var(--bg)}
.page-hero::before{content:'';position:absolute;inset:0;background-image:linear-gradient(var(--acc-dim) 1px,transparent 1px),linear-gradient(90deg,var(--acc-dim) 1px,transparent 1px);background-size:56px 56px;-webkit-mask-image:radial-gradient(ellipse 70% 80% at 30% 20%,#000 20%,transparent 100%);mask-image:radial-gradient(ellipse 70% 80% at 30% 20%,#000 20%,transparent 100%);pointer-events:none}
.page-hero .wrap{position:relative}
.page-hero h1{font-family:var(--font-head);font-size:clamp(30px,4.2vw,46px);line-height:1.12;letter-spacing:-.02em;font-weight:700;max-width:860px;margin-bottom:16px;color:var(--ink)}
.page-hero .sub{font-size:16.5px;color:var(--ink-dim);max-width:820px}

/* Case-study hero with consultation image */
.page-hero.case-hero{background-image:url(/assets/img/scenes/case-hero-consultation.webp);background-size:cover;background-position:right center;background-repeat:no-repeat;background-color:var(--bg)}
.page-hero.case-hero::before{display:none}
.page-hero.case-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(252,250,243,.97) 0%,rgba(252,250,243,.97) 55%,rgba(252,250,243,.55) 80%,rgba(252,250,243,0) 95%);pointer-events:none}
.page-hero.case-hero .wrap{position:relative;z-index:1}
@media(max-width:720px){
  .page-hero.case-hero::after{background:linear-gradient(90deg,rgba(252,250,243,.98) 0%,rgba(252,250,243,.98) 65%,rgba(252,250,243,.6) 85%,rgba(252,250,243,0) 100%)}
}

/* Lubricant manufacturing application hero */
.page-hero.app-hero-lube-mfg{background-image:url(/assets/img/scenes/app-lubricant-manufacturing-hero.webp);background-size:cover;background-position:right center;background-repeat:no-repeat;background-color:var(--bg)}
.page-hero.app-hero-lube-mfg::before{display:none}
.page-hero.app-hero-lube-mfg::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(252,250,243,.97) 0%,rgba(252,250,243,.97) 52%,rgba(252,250,243,.5) 78%,rgba(252,250,243,0) 93%);pointer-events:none}
.page-hero.app-hero-lube-mfg .wrap{position:relative;z-index:1}
@media(max-width:720px){
  .page-hero.app-hero-lube-mfg::after{background:linear-gradient(90deg,rgba(252,250,243,.98) 0%,rgba(252,250,243,.98) 65%,rgba(252,250,243,.6) 85%,rgba(252,250,243,0) 100%)}
}

/* Technology hero — filter cartridge with golden oil flow (contain to avoid cropping) */
.page-hero.tech-hero{background-color:var(--bg);background-image:url(/assets/img/scenes/tech-hero-filter-oil-flow.webp);background-size:contain;background-position:right center;background-repeat:no-repeat}
.page-hero.tech-hero::before{display:none}
.page-hero.tech-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(252,250,243,.97) 0%,rgba(252,250,243,.97) 50%,rgba(252,250,243,.5) 76%,rgba(252,250,243,0) 92%);pointer-events:none}
.page-hero.tech-hero .wrap{position:relative;z-index:1}
@media(max-width:720px){
  .page-hero.tech-hero{background-size:cover;background-position:66% center}
  .page-hero.tech-hero::after{background:linear-gradient(90deg,rgba(252,250,243,.98) 0%,rgba(252,250,243,.98) 65%,rgba(252,250,243,.6) 85%,rgba(252,250,243,0) 100%)}
}

/* FAQ hero — filter housing with Jingyuan.hk logo (contain to avoid cropping) */
.page-hero.faq-hero{background-color:var(--bg);background-image:url(/assets/img/scenes/faq-hero-filter-housing-6323.webp);background-size:contain;background-position:right center;background-repeat:no-repeat}
.page-hero.faq-hero::before{display:none}
.page-hero.faq-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(252,250,243,.97) 0%,rgba(252,250,243,.97) 50%,rgba(252,250,243,.5) 76%,rgba(252,250,243,0) 92%);pointer-events:none}
.page-hero.faq-hero .wrap{position:relative;z-index:1}
@media(max-width:720px){
  .page-hero.faq-hero{background-size:contain;background-position:right center}
  .page-hero.faq-hero::after{background:linear-gradient(90deg,rgba(252,250,243,.98) 0%,rgba(252,250,243,.98) 65%,rgba(252,250,243,.6) 85%,rgba(252,250,243,0) 100%)}
}

.spec-strip{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
.spec-strip .chip{background:var(--acc-dim)}

/* ---------- FAQ ---------- */
details.faq{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:18px 22px;margin-bottom:12px}
details.faq summary{cursor:pointer;font-family:var(--font-head);font-weight:600;font-size:15.5px}
details.faq[open]{border-color:var(--acc);box-shadow:0 0 0 3px var(--acc-dim)}
details.faq p{margin-top:12px;color:var(--ink-dim);font-size:14px}

/* ---------- ASCII diagram ---------- */
pre{background:#2E250F;color:#F2E2B8;padding:22px;border-radius:var(--radius);overflow-x:auto;font-family:var(--font-mono);font-size:.84rem;line-height:1.6}

/* ---------- Form ---------- */
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-grid .full{grid-column:1/-1}
@media (max-width:640px){.form-grid{grid-template-columns:1fr}}
label{display:block;font-weight:600;font-size:13.5px;margin-bottom:6px;font-family:var(--font-body);color:var(--ink)}
label span{color:#B03A2E}
input,select,textarea{width:100%;padding:11px 14px;border:1px solid var(--line-strong);border-radius:8px;font-family:var(--font-body);font-size:14px;background:var(--surface);color:var(--ink);transition:.18s}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--acc);box-shadow:0 0 0 3px var(--acc-dim)}
.hp-field{position:absolute;left:-9999px;opacity:0;height:0;overflow:hidden}
.form-status{margin-top:14px;font-weight:600;display:none;font-size:14px}
.form-status.ok{display:block;color:var(--ok)}
.form-status.err{display:block;color:#9A3328}
.form-status a{color:inherit}

/* ---------- Product hero gallery ---------- */
.gal-main{position:relative;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow-md);background:var(--surface)}
.gal-main img{width:100%;height:auto;aspect-ratio:16/9;object-fit:cover}
.gal-thumbs{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:12px}
.gal-thumbs img{aspect-ratio:16/9;height:auto;width:100%;object-fit:cover;border-radius:8px;border:1.5px solid var(--line);cursor:pointer;transition:.18s;background:var(--surface)}
.gal-thumbs img:hover{transform:translateY(-2px)}
.gal-thumbs img.on{border-color:var(--acc);box-shadow:0 0 0 2px var(--acc-dim)}

/* ---------- Dark CTA band (kept warm dark for contrast) ---------- */
.bg-dark{background:linear-gradient(135deg,#241C08,#3A2D0D);color:#F2E2B8;border-top:2px solid var(--acc)}
.bg-dark h2{color:#FFF7E6}
.bg-dark a:not(.btn){color:var(--gold-bright)}
.bg-dark .btn-pri{color:#241A02}
.bg-dark .btn-pri:hover{color:#241A02}
.bg-dark p{color:#D8CDAF}

/* Golden lubricant texture CTA band (homepage only) */
.bg-gold-texture{
  position:relative;
  background-color:#FFB300;
  background-image:url(/assets/img/scenes/hero-gold-texture.webp);
  background-size:cover;
  background-position:center;
  background-repeat:no-repeat;
  color:var(--ink);
  border-top:2px solid var(--acc-deep);
  text-align:center
}
.bg-gold-texture::before{
  content:"";
  position:absolute;
  inset:0;
  background:rgba(255,179,0,.25);
  pointer-events:none
}
.bg-gold-texture > .wrap{position:relative;z-index:1}
.bg-gold-texture h2{color:var(--ink);text-shadow:0 1px 0 rgba(255,255,255,.35)}
.bg-gold-texture p{color:rgba(34,26,12,.85);max-width:640px;margin:0 auto 26px;text-shadow:0 1px 0 rgba(255,255,255,.25)}
.bg-gold-texture .btn-pri{background:var(--ink);color:var(--acc);box-shadow:0 8px 24px rgba(34,26,12,.22)}
.bg-gold-texture .btn-pri:hover{background:#0f0b05;color:#FFC94D;transform:translateY(-2px)}
.bg-gold-texture .btn-ghost{border-color:rgba(34,26,12,.45);color:var(--ink)}
.bg-gold-texture .btn-ghost:hover{background:rgba(34,26,12,.08);color:var(--ink)}

/* ---------- Footer (light, fuel-style) ---------- */
.site-foot{border-top:1px solid var(--line);background:var(--surface);padding:52px 0 30px;color:var(--ink-sub);font-size:13.5px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;margin-bottom:36px}
@media (max-width:860px){.foot-grid{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.foot-grid{grid-template-columns:1fr}}
.site-foot h4{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink);margin-bottom:14px;font-weight:500}
.site-foot a{color:var(--ink-sub);text-decoration:none;display:block;margin-bottom:9px}
.site-foot a:hover{color:var(--acc-text)}
.site-foot p{font-size:13.5px}
.foot-base{border-top:1px solid var(--line);padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:12.5px;color:var(--ink-sub)}
.foot-note{margin-top:12px;font-size:12px;color:var(--ink-sub);line-height:1.6}
.foot-corp{display:inline-block;margin-top:6px;font-size:12px;font-weight:600;color:var(--gold-deep);text-decoration:none}
.foot-corp:hover{text-decoration:underline}

/* ============================================================
   Mobile navigation (hamburger) + Floating actions
   WhatsApp icon + Quick Consult widget — ported from fuel.jingyuan.hk,
   retuned for the gold theme.
   ============================================================ */

/* ---------- Mobile nav (hamburger) ---------- */
.nav-toggle{display:none;margin-left:auto;width:42px;height:42px;background:transparent;border:1.5px solid var(--line-strong);border-radius:9px;cursor:pointer;flex-direction:column;justify-content:center;align-items:center;gap:4px;padding:0;-webkit-appearance:none;appearance:none}
.nav-toggle-bar{display:block;width:18px;height:2px;background:var(--ink);border-radius:1px;transition:transform .22s,opacity .22s}
.head-inner.nav-open .nav-toggle .nav-toggle-bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.head-inner.nav-open .nav-toggle .nav-toggle-bar:nth-child(2){opacity:0}
.head-inner.nav-open .nav-toggle .nav-toggle-bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
@media(max-width:900px){
  .nav-toggle{display:inline-flex}
  .main-nav{position:absolute;top:100%;left:0;right:0;margin:0;flex-direction:column;align-items:stretch;gap:0;background:var(--surface);border-bottom:1px solid var(--line);box-shadow:0 16px 34px rgba(34,28,12,.14);padding:8px 0;max-height:0;overflow:hidden;transition:max-height .28s ease}
  .head-inner.nav-open .main-nav{max-height:82vh;overflow:auto}
  .main-nav a{padding:14px 24px;border-radius:0;font-size:15px}
  .main-nav a:not(.nav-cta){display:block}
  .main-nav a.nav-cta{margin:10px 18px;border-radius:9px;text-align:center}
}

/* ---------- Floating WhatsApp icon (green brand colour) ---------- */
.wa-float{position:fixed;right:20px;bottom:92px;z-index:200;width:58px;height:58px;border-radius:50%;background:#25D366;color:#fff;display:flex;align-items:center;justify-content:center;text-decoration:none;box-shadow:0 10px 26px rgba(37,211,102,.42),0 4px 10px rgba(34,28,12,.18);transition:transform .22s,box-shadow .22s}
.wa-float:hover{transform:translateY(-3px) scale(1.04);box-shadow:0 14px 32px rgba(37,211,102,.55),0 6px 14px rgba(34,28,12,.22)}
.wa-float svg{width:30px;height:30px;display:block;fill:currentColor}
.wa-float::after{content:"";position:absolute;inset:-6px;border-radius:50%;border:2px solid rgba(37,211,102,.45);animation:waPulse 2.4s ease-out infinite;pointer-events:none}
@keyframes waPulse{0%{transform:scale(.86);opacity:.7}70%{transform:scale(1.18);opacity:0}100%{transform:scale(1.18);opacity:0}}
@media(max-width:560px){.wa-float{right:14px;bottom:78px;width:52px;height:52px}.wa-float svg{width:27px;height:27px}}

/* ---------- Quick Consult floating widget (gold theme) ---------- */
.fc-btn{position:fixed;right:20px;bottom:22px;z-index:9000;display:flex;align-items:center;gap:9px;height:54px;padding:0 22px;border-radius:999px;background:var(--acc);color:#241A02;border:none;cursor:pointer;font-family:var(--font-body);font-size:14px;font-weight:700;letter-spacing:.01em;box-shadow:0 10px 28px rgba(255,179,0,.4);transition:transform .2s,box-shadow .2s}
.fc-btn:hover{transform:translateY(-2px);box-shadow:0 14px 34px rgba(255,179,0,.5)}
.fc-btn svg{width:20px;height:20px;fill:#241A02;flex:none}
.fc-overlay{position:fixed;inset:0;background:rgba(34,28,12,.42);z-index:9001;opacity:0;pointer-events:none;transition:opacity .25s}
.fc-overlay.open{opacity:1;pointer-events:auto}
.fc-panel{position:fixed;right:20px;bottom:88px;z-index:9002;width:352px;max-width:calc(100vw - 40px);max-height:calc(100vh - 130px);overflow-y:auto;background:var(--surface);border:1px solid var(--line);border-radius:14px;box-shadow:0 24px 64px rgba(34,28,12,.28);opacity:0;transform:translateY(14px) scale(.97);pointer-events:none;transition:opacity .25s,transform .25s}
.fc-panel.open{opacity:1;transform:none;pointer-events:auto}
.fc-head{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid var(--line);font-family:var(--font-head);font-weight:700;font-size:16px;color:var(--ink)}
.fc-x{background:none;border:none;font-size:22px;line-height:1;color:var(--ink-sub);cursor:pointer;padding:0 2px}
.fc-x:hover{color:var(--ink)}
.fc-body{padding:16px 18px 18px}
.fc-l{display:block;font-size:12px;font-weight:600;color:var(--ink-dim);margin:0 0 12px}
.fc-l input,.fc-l textarea{display:block;width:100%;margin-top:5px;padding:10px 12px;border:1px solid var(--line-strong);border-radius:8px;font-family:var(--font-body);font-size:13.5px;color:var(--ink);background:var(--bg)}
.fc-l textarea{resize:vertical;min-height:72px}
.fc-l input:focus,.fc-l textarea:focus{outline:none;border-color:var(--acc);box-shadow:0 0 0 3px var(--acc-dim)}
.fc-hp{position:absolute;left:-6000px;top:-6000px;width:1px;height:1px;opacity:0}
.fc-send{width:100%;padding:12px;border:none;border-radius:9px;background:var(--acc);color:#241A02;font-family:var(--font-body);font-size:14px;font-weight:700;cursor:pointer;transition:background .2s}
.fc-send:hover{background:var(--acc-lt)}
.fc-send:disabled{background:var(--ink-sub);cursor:default;color:#fff}
.fc-status{margin-top:12px;padding:11px 13px;border-radius:8px;font-size:13px;line-height:1.55}
.fc-status.ok{background:#EAF7EE;border:1px solid #9FD4AE;color:#1A6B33}
.fc-status.err{background:#FDF1F0;border:1px solid #EAB4AF;color:#9A3328}
.fc-status a{color:inherit;font-weight:600}
@media(max-width:560px){
  .fc-btn{right:14px;bottom:14px;height:48px;padding:0 17px;font-size:13px}
  .fc-panel{right:14px;left:14px;width:auto;bottom:74px}
}

/* V47 — responsive hero backgrounds: serve lighter mobile variants at <=720px (additive; desktop sources unchanged) */
@media (max-width:720px){
  .hero-photo{background-image:url(/assets/img/scenes/hero-lubricant-facility-9735-m.webp)}
  .page-hero.case-hero{background-image:url(/assets/img/scenes/case-hero-consultation-m.webp)}
  .page-hero.app-hero-lube-mfg{background-image:url(/assets/img/scenes/app-lubricant-manufacturing-hero-m.webp)}
  .page-hero.tech-hero{background-image:url(/assets/img/scenes/tech-hero-filter-oil-flow-m.webp)}
  .page-hero.faq-hero{background-image:url(/assets/img/scenes/faq-hero-filter-housing-6323-m.webp)}
  .bg-gold-texture{background-image:url(/assets/img/scenes/hero-gold-texture-m.webp)}
}

.skip-link{position:absolute;top:-40px;left:0;background:var(--ink);color:#fff;padding:8px 16px;z-index:10000;transition:top .2s;text-decoration:none;font-family:var(--font-body);font-size:14px;border-radius:0 0 8px 0}
.skip-link:focus{top:0}

/* V48 — respect user motion preferences (accessibility) */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .wa-float::after { animation: none; }
}