:root{--ink:#0a2035;--deep:#002d55;--blue:#006fba;--sky:#eaf5ff;--red:#d92d20;--yellow:#f5c242;--green:#067647;--muted:#5f7082;--line:#dce6ef;--paper:#fff;--soft:#f6f9fc;--shadow:0 18px 55px rgba(4,35,63,.10);--radius:26px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,Segoe UI,Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.65}img{max-width:100%;display:block}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit}.container{width:min(1180px,calc(100% - 36px));margin:auto}.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.95);backdrop-filter:blur(16px);border-bottom:1px solid rgba(220,230,239,.85);display:flex;align-items:center;justify-content:space-between;padding:12px max(18px,calc((100vw - 1180px)/2))}.brand{display:flex;align-items:center;gap:12px}.logo{width:48px;height:48px;object-fit:contain;border-radius:12px}.brandText{display:grid;line-height:1.1}.brandText b{font-size:18px;color:var(--deep)}.brandText span{font-size:11px;color:var(--muted);letter-spacing:.08em;text-transform:uppercase}.nav nav{display:flex;align-items:center;gap:6px}.nav nav>a{font-weight:750;padding:10px 11px;border-radius:12px}.nav nav>a:hover,.nav nav>a.active{background:var(--sky);color:var(--blue)}.menuBtn{display:none;border:0;background:var(--deep);color:#fff;border-radius:12px;padding:10px 13px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:14px;background:var(--deep);color:#fff;padding:13px 18px;font-weight:850;cursor:pointer;box-shadow:0 10px 25px rgba(0,45,85,.16)}.btn:hover{transform:translateY(-1px)}.btn.ghost{background:#fff;color:var(--deep);border:1px solid var(--line);box-shadow:none}.btn.yellow{background:var(--yellow);color:var(--deep)}.btn.small{padding:9px 13px}.eyebrow{font-size:12px;font-weight:900;letter-spacing:.13em;text-transform:uppercase;color:var(--blue);margin:0 0 12px}.hero{padding:76px 0 50px;background:radial-gradient(circle at 80% 20%,#e8f5ff 0,transparent 35%),linear-gradient(180deg,#f9fcff,#fff)}.heroGrid{display:grid;grid-template-columns:1.08fr .92fr;gap:52px;align-items:center}.hero h1{font-size:clamp(42px,6vw,76px);line-height:1.02;letter-spacing:-.045em;margin:0 0 20px;color:var(--deep)}.hero p{font-size:19px;color:var(--muted);max-width:700px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}.heroVisual{position:relative;min-height:470px}.heroVisual:before{content:"";position:absolute;inset:8% 2% 4%;background:linear-gradient(145deg,#dff2ff,#fff8d5);border-radius:38px;transform:rotate(-2deg)}.heroVisual img{position:absolute;width:47%;border-radius:24px;box-shadow:var(--shadow);background:#fff;object-fit:contain}.heroVisual .gasImg{left:6%;top:5%;transform:rotate(-6deg)}.heroVisual .dieselImg{right:4%;bottom:2%;transform:rotate(5deg)}.heroStat{position:absolute;left:25%;bottom:6%;background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px 18px;box-shadow:var(--shadow);font-weight:850}.trustBar{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:22px;overflow:hidden;margin-top:35px}.trustBar div{background:#fff;padding:18px}.trustBar b{display:block;color:var(--deep)}.trustBar span{font-size:13px;color:var(--muted)}.section{padding:82px 0}.section.alt{background:var(--soft)}.sectionHead{display:flex;justify-content:space-between;gap:24px;align-items:end;margin-bottom:30px}.section h2{font-size:clamp(32px,4vw,52px);line-height:1.08;letter-spacing:-.03em;color:var(--deep);margin:0}.sectionHead p{max-width:520px;color:var(--muted);margin:0}.productGrid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.productCard{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);overflow:hidden}.productCard:after{content:"";position:absolute;width:180px;height:180px;border-radius:50%;background:var(--sky);right:-70px;top:-70px;z-index:0}.productCard>*{position:relative;z-index:1}.productTop{display:grid;grid-template-columns:190px 1fr;gap:22px;align-items:center}.productTop img{width:190px;height:230px;object-fit:contain;background:#fff;border-radius:20px}.pill{display:inline-flex;border-radius:999px;padding:7px 11px;background:var(--sky);color:var(--blue);font-weight:850;font-size:13px}.productCard h3{font-size:28px;line-height:1.16;color:var(--deep);margin:12px 0}.price{font-size:31px;color:var(--red);font-weight:950}.featureTicks{display:grid;gap:8px;margin:18px 0;color:#35495b}.featureTicks span:before{content:"✓";color:var(--green);font-weight:900;margin-right:8px}.cardActions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.compare{overflow:auto;border:1px solid var(--line);border-radius:22px;background:#fff}.compare table{width:100%;border-collapse:collapse;min-width:760px}.compare th,.compare td{padding:17px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}.compare th{background:var(--deep);color:#fff}.compare tr:last-child td{border-bottom:0}.iconGrid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.iconCard{background:#fff;border:1px solid var(--line);border-radius:22px;padding:23px}.icon{width:48px;height:48px;display:grid;place-items:center;border-radius:15px;background:var(--sky);font-size:24px}.iconCard h3{margin:15px 0 8px;color:var(--deep)}.iconCard p{margin:0;color:var(--muted)}.caseGrid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.caseCard{background:linear-gradient(180deg,#fff,#f7fbff);border:1px solid var(--line);border-radius:24px;padding:25px}.caseCard .num{font-size:13px;font-weight:900;color:var(--blue)}.caseCard h3{font-size:24px;margin:10px 0;color:var(--deep)}.caseCard p{color:var(--muted)}.docStrip{display:grid;grid-template-columns:1fr 1fr;gap:22px}.docPromo{border-radius:28px;padding:32px;background:var(--deep);color:#fff}.docPromo.secondary{background:#eef6fc;color:var(--ink);border:1px solid var(--line)}.docPromo h3{font-size:31px;margin:8px 0}.docPromo p{opacity:.85}.faq{display:grid;gap:12px}.faq details{border:1px solid var(--line);border-radius:18px;padding:18px 20px;background:#fff}.faq summary{cursor:pointer;font-weight:850;color:var(--deep)}.faq p{color:var(--muted)}.ctaBand{background:linear-gradient(135deg,#002d55,#006fba);color:#fff;border-radius:32px;padding:42px;display:flex;align-items:center;justify-content:space-between;gap:25px}.ctaBand h2{color:#fff}.footer{background:#071a2a;color:#d8e5ef;padding:55px 0 28px}.footerGrid{display:grid;grid-template-columns:1.4fr .8fr .8fr;gap:35px}.footer h3{color:#fff}.footer a{display:block;margin:7px 0;color:#c4d2dd}.footer small{display:block;border-top:1px solid #294052;margin-top:35px;padding-top:20px}.pageHero{padding:70px 0 38px;background:linear-gradient(180deg,#f1f8ff,#fff)}.pageHero h1{font-size:clamp(40px,6vw,70px);line-height:1.03;letter-spacing:-.04em;margin:0;color:var(--deep)}.pageHero p{font-size:18px;color:var(--muted);max-width:760px}.productPage{display:grid;grid-template-columns:.95fr 1.05fr;gap:50px;align-items:start}.galleryMain{position:sticky;top:100px}.mainImg{border:1px solid var(--line);border-radius:28px;background:#fff;padding:24px;box-shadow:var(--shadow);height:520px;object-fit:contain;width:100%}.thumbs{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:12px}.thumbs img{border:1px solid var(--line);border-radius:14px;height:92px;width:100%;object-fit:contain;background:#fff;cursor:pointer}.productInfo h2{font-size:42px;margin:8px 0 12px;color:var(--deep)}.stockLine{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}.stockLine span{padding:8px 11px;border-radius:999px;background:#eef7ff;color:var(--deep);font-size:13px;font-weight:850}.tierTable{width:100%;border-collapse:collapse;border:1px solid var(--line);border-radius:18px;overflow:hidden;margin:20px 0}.tierTable th,.tierTable td{padding:13px 15px;border-bottom:1px solid var(--line);text-align:left}.tierTable th{background:var(--deep);color:#fff}.specGrid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.specCard{border:1px solid var(--line);border-radius:20px;padding:20px;background:#fff}.specCard h3{margin-top:0;color:var(--deep)}.documentStrip{display:flex;gap:10px;flex-wrap:wrap}.articleGrid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.articleCard{border:1px solid var(--line);border-radius:24px;background:#fff;overflow:hidden;transition:.2s}.articleCard:hover{transform:translateY(-4px);box-shadow:var(--shadow)}.articleCover{height:180px;background:linear-gradient(135deg,#dff2ff,#fff1b8);display:grid;place-items:center;font-size:54px}.articleBody{padding:22px}.articleMeta{font-size:12px;color:var(--blue);font-weight:850;text-transform:uppercase}.articleCard h3{font-size:23px;line-height:1.2;color:var(--deep);margin:10px 0}.articleCard p{color:var(--muted)}.filterBar{display:flex;gap:9px;flex-wrap:wrap;margin:22px 0 30px}.filterBar button{border:1px solid var(--line);background:#fff;border-radius:999px;padding:9px 13px;font-weight:800}.docGrid{display:grid;grid-template-columns:1fr 1fr;gap:22px}.docCard{border:1px solid var(--line);border-radius:24px;background:#fff;padding:24px;box-shadow:var(--shadow)}.docCard h3{font-size:25px;margin:8px 0;color:var(--deep)}.docMeta{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:16px 0}.docMeta div{background:var(--soft);border-radius:14px;padding:11px}.docMeta small{display:block;color:var(--muted)}.cartNavBtn{border:0;background:var(--deep);color:#fff;border-radius:999px;padding:10px 14px;font-weight:900;cursor:pointer}.cartNavBtn span{display:inline-flex;min-width:23px;height:23px;align-items:center;justify-content:center;background:var(--yellow);color:var(--deep);border-radius:999px;margin-left:4px}.noScroll{overflow:hidden}.cartOverlay{position:fixed;inset:0;background:rgba(1,16,31,.5);opacity:0;visibility:hidden;transition:.25s;z-index:80}.cartOverlay.open{opacity:1;visibility:visible}.cartDrawer{position:fixed;right:0;top:0;width:min(470px,100%);height:100%;background:#fff;z-index:81;transform:translateX(105%);transition:.3s;padding:24px;overflow:auto;box-shadow:-20px 0 60px rgba(0,0,0,.2)}.cartDrawer.open{transform:none}.cartHead{display:flex;justify-content:space-between;border-bottom:1px solid var(--line);padding-bottom:15px}.iconBtn{border:0;background:#eef4f8;width:42px;height:42px;border-radius:50%;font-size:28px}.emptyCart{text-align:center;padding:45px 12px;color:var(--muted)}.cartItem{display:grid;grid-template-columns:68px 1fr auto;gap:12px;align-items:center;padding:15px 0;border-bottom:1px solid var(--line)}.cartItem img{width:68px;height:68px;object-fit:contain}.qty{display:flex;gap:7px;align-items:center}.qty button{border:1px solid var(--line);background:#fff;border-radius:8px}.remove{color:var(--red)}.discountBox{background:var(--soft);border-radius:16px;padding:14px;margin-top:15px}.discountBox>div,.cartSummary{display:flex;justify-content:space-between}.saving{color:var(--green)}.cartSummary{padding:20px 0;font-size:19px}.cartSummary b{font-size:25px;color:var(--red)}.checkoutBtn{width:100%}.cartHint,.unit-note{color:var(--muted);font-size:13px}.checkoutModal{position:fixed;inset:0;background:rgba(1,16,31,.72);z-index:90;display:none;align-items:flex-start;justify-content:center;padding:30px 16px;overflow:auto}.checkoutModal.open{display:flex}.checkoutPanel{position:relative;width:min(980px,100%);background:#fff;border-radius:28px;padding:34px}.checkoutClose{position:absolute;right:18px;top:18px}.customerForm{display:grid;grid-template-columns:1fr 1fr;gap:16px}.customerForm label{display:grid;gap:6px;font-weight:850}.customerForm label:nth-child(n+4),.customerForm button{grid-column:1/-1}.customerForm input,.customerForm textarea{border:1px solid var(--line);border-radius:12px;padding:12px;background:#f9fbfd}.paymentGrid{display:grid;grid-template-columns:.9fr 1.1fr;gap:22px}.qrCard,.bankCard,.orderRecap{border:1px solid var(--line);border-radius:22px;padding:20px;background:#fbfdff}.qrCard{text-align:center}.orderRecap>div{display:flex;justify-content:space-between;padding:9px 0;border-bottom:1px solid var(--line)}.paymentActions{display:flex;gap:9px;flex-wrap:wrap;margin-top:18px}.orderPill{display:inline-block;background:var(--sky);padding:9px 13px;border-radius:999px}.payAmount{font-size:27px;color:var(--red);font-weight:900}.callbar{position:fixed;right:18px;bottom:18px;display:grid;gap:8px;z-index:40}.callbar a{display:flex;align-items:center;justify-content:center;width:52px;height:52px;border-radius:50%;background:var(--blue);color:#fff;box-shadow:var(--shadow);font-weight:900}.callbar a:last-child{background:var(--green)}
@media(max-width:980px){.nav nav{display:none;position:absolute;left:18px;right:18px;top:76px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch}.nav nav.open{display:flex}.menuBtn{display:block}.heroGrid,.productPage,.productGrid,.docStrip,.docGrid{grid-template-columns:1fr}.heroVisual{min-height:390px}.trustBar{grid-template-columns:1fr 1fr}.iconGrid{grid-template-columns:1fr 1fr}.caseGrid,.articleGrid{grid-template-columns:1fr 1fr}.galleryMain{position:static}.footerGrid{grid-template-columns:1fr 1fr}.cartNavBtn{border-radius:12px}.mainImg{height:430px}}
@media(max-width:640px){.container{width:min(100% - 24px,1180px)}.nav{padding:10px 12px}.brandText span{display:none}.hero{padding-top:48px}.hero h1{font-size:43px}.heroVisual{min-height:320px}.heroStat{left:12%;font-size:13px}.trustBar,.iconGrid,.caseGrid,.articleGrid,.specGrid,.docMeta,.footerGrid,.customerForm,.paymentGrid{grid-template-columns:1fr}.section{padding:58px 0}.sectionHead{display:block}.sectionHead p{margin-top:12px}.productTop{grid-template-columns:120px 1fr}.productTop img{width:120px;height:170px}.productCard h3{font-size:22px}.ctaBand{padding:28px;display:block}.ctaBand .btn{margin-top:18px}.mainImg{height:330px}.thumbs img{height:68px}.checkoutPanel{padding:24px 16px}.customerForm label{grid-column:1/-1}.cartNavBtn{display:block}.pageHero{padding-top:48px}}
@media print{.nav,.callbar,.paymentActions,.checkoutClose,.cartDrawer,.cartOverlay{display:none!important}.checkoutModal{position:static;display:block!important;background:#fff;padding:0}.checkoutPanel{box-shadow:none;padding:0}}
/* Compatibility for existing V7 articles */
.articleHero{padding:62px 0 34px;background:linear-gradient(180deg,#edf7ff,#fff);text-align:center}.articleHero h1{font-size:clamp(38px,5vw,62px);line-height:1.08;color:var(--deep);max-width:900px;margin:8px auto 14px}.articleHero p{max-width:760px;margin:auto;color:var(--muted);font-size:18px}.articleWrap{width:min(860px,calc(100% - 32px));margin:0 auto;padding:55px 0}.articleWrap h2{font-size:32px;color:var(--deep);margin-top:42px}.articleWrap h3{color:var(--deep)}.articleWrap p,.articleWrap li{font-size:17px}.summary,.infoBox,.note{background:#f2f8fd;border-left:5px solid var(--blue);padding:20px 22px;border-radius:16px;margin:24px 0}.checklist{padding-left:0;list-style:none}.checklist li{padding:8px 0}.checklist li:before{content:"✓";color:var(--green);font-weight:900;margin-right:9px}.orderBox{background:#fff;border:1px solid var(--line);border-radius:24px;padding:26px;box-shadow:var(--shadow)}.orderGrid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.orderBox label{display:grid;gap:6px;font-weight:850}.orderBox input,.orderBox select,.orderBox textarea{border:1px solid var(--line);border-radius:12px;padding:12px;background:#f9fbfd}.orderActions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.zalo{background:#006fba}.emailBtn{background:#fff;color:var(--deep);border:1px solid var(--line);box-shadow:none}.link{font-weight:850;color:var(--blue)}.tagline{font-size:18px;font-weight:850;color:var(--deep)}
@media(max-width:640px){.orderGrid{grid-template-columns:1fr}}

/* KB1.1 — Premium article template */
.kbArticleHero{padding:58px 0;background:linear-gradient(135deg,#071f3d 0%,#0d4168 60%,#0b6b75 100%);color:#fff;overflow:hidden}.kbHeroGrid{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(280px,.6fr);gap:42px;align-items:center}.breadcrumbs{display:flex;gap:9px;flex-wrap:wrap;font-size:13px;margin-bottom:22px;color:#d7e8f1}.breadcrumbs a{color:#d7e8f1}.kbArticleHero h1{font-size:clamp(38px,5.2vw,68px);line-height:1.05;max-width:900px;margin:10px 0 20px}.kbLead{font-size:19px;line-height:1.65;max-width:850px;color:#e2eff5}.articleMetaRow{display:flex;gap:10px;flex-wrap:wrap;color:#bcd3df;font-size:14px;margin-top:24px}.kbCoverVisual{min-height:360px;border:1px solid rgba(255,255,255,.25);border-radius:28px;background:radial-gradient(circle at 70% 25%,rgba(255,255,255,.18),transparent 28%),linear-gradient(145deg,rgba(255,255,255,.13),rgba(255,255,255,.04));position:relative;display:flex;align-items:flex-end;padding:28px;box-shadow:0 24px 60px rgba(0,0,0,.22)}.kbCoverVisual p{font-size:22px;font-weight:700;line-height:1.25}.coverBadge,.coverDrop,.coverEngine{position:absolute;display:grid;place-items:center;font-weight:900;box-shadow:0 14px 35px rgba(0,0,0,.22)}.coverBadge{width:118px;height:118px;border-radius:26px;left:28px;top:30px;background:#e94545;font-size:42px}.coverDrop{width:92px;height:112px;border-radius:52% 48% 58% 42%/62% 44% 56% 38%;right:34px;top:44px;background:#67d3ed;color:#07304d;font-size:24px;transform:rotate(12deg)}.coverEngine{width:112px;height:112px;border-radius:50%;right:70px;bottom:78px;background:#f4b942;color:#142b3e;font-size:52px}.kbArticleLayout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:44px;padding-top:58px;padding-bottom:70px}.kbArticleContent{font-size:17px;line-height:1.82;color:#263847}.kbArticleContent h2{font-size:32px;line-height:1.2;color:#0a2e4f;margin:52px 0 18px;scroll-margin-top:100px}.kbArticleContent h3{font-size:22px;color:#123f63;margin:30px 0 10px}.kbArticleContent p{margin:0 0 18px}.quickSummary{display:grid;grid-template-columns:92px 1fr;gap:24px;padding:28px;border-radius:22px;background:#edf8fb;border:1px solid #c8e6ed;margin-bottom:28px}.quickSummary h2,.learnBox h2,.vectorInfo h2,.mythFact h2,.audienceCheck h2,.articleFaq h2,.references h2{margin:0 0 14px;font-size:25px}.quickSummary ul{margin:0;padding-left:20px}.quickIcon{width:78px;height:78px;border-radius:50%;background:#0b7182;color:#fff;display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:28px;font-weight:900;line-height:.8}.quickIcon span{font-size:13px;margin-top:9px}.learnBox{padding:24px 28px;border-radius:20px;background:#fff;border:1px solid #dce5eb;box-shadow:0 14px 34px rgba(8,45,72,.07)}.learnGrid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.learnGrid span{padding:12px 14px;border-radius:12px;background:#f5f8fa}.vectorInfo{margin:34px 0;padding:30px;border-radius:24px;background:#082d4b;color:#fff}.vectorInfo h2{color:#fff;max-width:780px}.flowSteps{display:grid;grid-template-columns:1fr auto 1fr auto 1fr auto 1fr auto 1fr;gap:10px;align-items:stretch;margin:26px 0 18px}.flowSteps>i{align-self:center;font-style:normal;font-size:24px;color:#7fc6d6}.flowStep{border-radius:16px;padding:16px 13px;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.15);min-height:145px}.flowStep b{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:#2ca5b9;margin-bottom:16px}.flowStep span{display:block;font-weight:800;font-size:17px}.flowStep small{display:block;color:#c7dce6;margin-top:8px;line-height:1.45}.flowStep.warning{background:rgba(244,185,66,.16)}.flowStep.warning b{background:#f4b942;color:#193149}.flowStep.danger{background:rgba(233,69,69,.17)}.flowStep.danger b{background:#e94545}.vectorCaption{font-size:14px;color:#c8dce5;margin:0!important}.toc{display:grid;gap:9px;margin:34px 0;padding:24px 28px;background:#f7f9fa;border-left:4px solid #0b7182;border-radius:0 16px 16px 0}.toc a{color:#24566f}.fuelFact,.insightBox,.engineerNote{margin:28px 0;padding:24px 26px;border-radius:18px}.fuelFact{background:#fff6df;border:1px solid #efd087}.fuelFact span{display:inline-block;background:#f4b942;color:#17314a;font-weight:900;padding:5px 10px;border-radius:999px;margin-bottom:10px}.insightBox{background:#eaf5ff;border:1px solid #b8d9ee}.engineerNote{background:#edf8ef;border:1px solid #b8ddbd}.numberList{padding-left:23px}.numberList li{margin-bottom:14px}.mythFact{margin-top:42px}.mythFact>div{padding:18px 20px;border:1px solid #e0e7eb;border-radius:14px;margin:12px 0}.mythFact>div b{color:#b52f38}.audienceCheck{margin:42px 0;padding:26px;background:#102f4a;color:#fff;border-radius:22px}.audienceCheck h2{color:#fff}.audienceGrid{display:flex;flex-wrap:wrap;gap:10px}.audienceGrid button{border:1px solid rgba(255,255,255,.34);background:rgba(255,255,255,.1);color:#fff;border-radius:999px;padding:10px 15px;cursor:pointer}.audienceGrid button:hover,.audienceGrid button.active{background:#fff;color:#123653}.audienceCheck p{margin:18px 0 0;color:#d6e5ed}.articleFaq details{border-bottom:1px solid #dce4e8;padding:16px 0}.articleFaq summary{font-weight:800;cursor:pointer;color:#123f63}.articleFaq details p{padding-top:10px}.references{font-size:15px;padding-top:8px}.references li{margin-bottom:10px}.kbSidebar{display:flex;flex-direction:column;gap:18px}.sideCard{border:1px solid #dfe7eb;border-radius:20px;padding:24px;background:#fff;box-shadow:0 15px 40px rgba(7,39,62,.07)}.sideCard h3{margin-top:0;color:#0b3455}.sideCard a:not(.btn){display:block;padding:10px 0;border-bottom:1px solid #edf1f3;color:#24566f}.stickyCard{position:sticky;top:90px}.sidePrice{font-size:26px;font-weight:900;color:#d93c3c;margin:14px 0}.stickyCard .btn{display:block;text-align:center}.textLink{color:#176786;font-weight:700}.articleCTA{background:#eaf4f7;padding:46px 0}.articleCTA .container{display:flex;align-items:center;justify-content:space-between;gap:30px}.articleCTA h2{margin:7px 0 10px;font-size:34px;color:#0a2e4f}.ctaButtons{display:flex;gap:12px;flex-wrap:wrap}.btn.ghost{background:transparent;color:#123f63;border:1px solid #7395a8}.relatedSection{background:#fafcfd}
@media(max-width:980px){.kbHeroGrid,.kbArticleLayout{grid-template-columns:1fr}.kbCoverVisual{min-height:300px}.kbSidebar{display:grid;grid-template-columns:1fr 1fr}.stickyCard{position:static}.flowSteps{grid-template-columns:1fr}.flowSteps>i{transform:rotate(90deg);justify-self:center}.articleCTA .container{display:block}.ctaButtons{margin-top:20px}}
@media(max-width:640px){.kbArticleHero{padding:40px 0}.kbArticleHero h1{font-size:39px}.kbLead{font-size:17px}.kbCoverVisual{min-height:260px}.kbArticleLayout{padding-top:30px}.quickSummary{grid-template-columns:1fr}.learnGrid,.kbSidebar{grid-template-columns:1fr}.kbArticleContent{font-size:16px}.kbArticleContent h2{font-size:27px}.vectorInfo{padding:22px}.articleCTA h2{font-size:28px}}

/* KB1.2 Delivery 1 — Article Template 2.0 */
.articleV2Hero{padding:28px 0 60px;background:linear-gradient(180deg,#f4faff 0%,#ffffff 100%);border-bottom:1px solid var(--line)}
.articleV2Hero .breadcrumbs{color:var(--muted);margin-bottom:24px}.articleV2Hero .breadcrumbs a{color:var(--blue)}
.articleV2Grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(320px,.65fr);gap:44px;align-items:center}
.articleV2Category{display:inline-flex;padding:7px 12px;border-radius:999px;background:#dff1ff;color:var(--blue);font-size:12px;font-weight:900;letter-spacing:.08em;text-transform:uppercase}
.articleV2Hero h1{font-size:clamp(42px,5.7vw,72px);line-height:1.03;letter-spacing:-.045em;color:var(--deep);margin:16px 0 20px;max-width:940px}
.articleV2Deck{font-size:19px;color:var(--muted);max-width:820px;margin:0 0 22px}
.articleMetaV2{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}.articleMetaV2 span{display:inline-flex;align-items:center;gap:7px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 12px;font-size:13px;font-weight:800;color:#385269}
.difficulty.basic{background:#eaf8ef;color:#067647;border-color:#bfe2cb}.difficulty.medium{background:#fff7e1;color:#8a5a00;border-color:#eedca6}.difficulty.advanced{background:#edf2ff;color:#324b9b;border-color:#c9d5ff}
.articleCoverV2{min-height:390px;border-radius:32px;position:relative;overflow:hidden;background:linear-gradient(145deg,#06365f,#0b6f89 58%,#dff5ff);box-shadow:var(--shadow)}
.articleCoverV2:before{content:"";position:absolute;width:300px;height:300px;border-radius:50%;background:rgba(255,255,255,.12);right:-80px;top:-70px}.articleCoverV2:after{content:"E10";position:absolute;left:30px;bottom:26px;font-weight:950;font-size:94px;line-height:1;color:rgba(255,255,255,.17)}
.coverTank{position:absolute;left:42px;top:56px;width:150px;height:175px;border:11px solid #fff;border-radius:28px 28px 34px 34px}.coverTank:before{content:"";position:absolute;left:28px;top:-37px;width:72px;height:38px;border:11px solid #fff;border-bottom:0;border-radius:16px 16px 0 0}.coverTank:after{content:"";position:absolute;right:-44px;top:32px;width:52px;height:88px;border:10px solid #fff;border-left:0;border-radius:0 22px 22px 0}
.coverDropV2{position:absolute;right:68px;top:58px;width:104px;height:132px;background:#74ddf1;border-radius:52% 48% 58% 42%/62% 44% 56% 38%;transform:rotate(12deg);box-shadow:0 16px 40px rgba(0,0,0,.2)}.coverDropV2:after{content:"H₂O";position:absolute;inset:0;display:grid;place-items:center;color:#073653;font-size:28px;font-weight:950;transform:rotate(-12deg)}
.coverEngineV2{position:absolute;right:52px;bottom:50px;width:150px;height:112px;border-radius:22px;background:#f5c242;box-shadow:0 16px 42px rgba(0,0,0,.22)}.coverEngineV2:before{content:"";position:absolute;left:-28px;top:23px;width:30px;height:66px;background:#f5c242;border-radius:10px 0 0 10px}.coverEngineV2:after{content:"⚙";position:absolute;inset:0;display:grid;place-items:center;font-size:62px;color:#17314a}
.readingPath{margin-top:24px;padding:18px 20px;border:1px solid var(--line);border-radius:18px;background:#fff}.readingPath b{display:block;margin-bottom:10px;color:var(--deep)}.readingPath ol{display:flex;gap:8px;flex-wrap:wrap;margin:0;padding:0;list-style:none;counter-reset:path}.readingPath li{counter-increment:path}.readingPath a{display:inline-flex;align-items:center;gap:7px;padding:8px 11px;border-radius:999px;background:var(--soft);font-size:13px;font-weight:800;color:#33566f}.readingPath a:before{content:counter(path);display:grid;place-items:center;width:22px;height:22px;border-radius:50%;background:var(--deep);color:#fff;font-size:11px}
.articleV2Layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:46px;padding:56px 0 78px}.articleV2Content{font-size:17px;line-height:1.82;color:#263847}.articleV2Content h2{font-size:34px;line-height:1.18;color:var(--deep);margin:54px 0 18px;scroll-margin-top:110px}.articleV2Content h3{font-size:23px;color:#123f63;margin:32px 0 12px}.articleV2Content p{margin:0 0 18px}.articleV2Content a{color:var(--blue);font-weight:800}
.summary30{display:grid;grid-template-columns:90px 1fr;gap:22px;padding:26px;border-radius:22px;background:#edf8fb;border:1px solid #c8e6ed}.summary30 .clock{width:76px;height:76px;border-radius:50%;display:grid;place-items:center;background:#0b7182;color:#fff;font-size:26px;font-weight:950}.summary30 h2{margin:0 0 10px;font-size:26px}.summary30 ul{margin:0;padding-left:20px}
.learningOutcomes{margin-top:24px;padding:24px;border:1px solid var(--line);border-radius:20px;background:#fff;box-shadow:0 12px 32px rgba(7,39,62,.06)}.learningOutcomes h2{margin:0 0 14px;font-size:25px}.learningOutcomesGrid{display:grid;grid-template-columns:1fr 1fr;gap:11px}.learningOutcomesGrid span{padding:12px 14px;border-radius:12px;background:var(--soft)}
.articleInfographic{margin:34px 0;padding:30px;border-radius:24px;background:#082d4b;color:#fff}.articleInfographic h2{color:#fff;margin:0 0 10px;font-size:28px}.articleInfographic p{color:#cfe0e8}.infoFlow{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-top:24px}.infoNode{min-height:150px;padding:16px;border-radius:16px;background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.16);position:relative}.infoNode:not(:last-child):after{content:"→";position:absolute;right:-18px;top:55px;color:#8ed3df;font-size:28px;z-index:3}.infoNode b{display:grid;place-items:center;width:31px;height:31px;border-radius:50%;background:#2ca5b9;margin-bottom:14px}.infoNode strong{display:block;font-size:17px}.infoNode small{display:block;color:#c7dce6;margin-top:7px;line-height:1.45}.infoNode.warn{background:rgba(245,194,66,.16)}.infoNode.warn b{background:#f5c242;color:#183149}.infoNode.risk{background:rgba(217,45,32,.18)}.infoNode.risk b{background:#d92d20}
.articleV2Toc{margin:34px 0;padding:24px 28px;border-left:4px solid var(--blue);border-radius:0 16px 16px 0;background:#f7fafc}.articleV2Toc b{display:block;margin-bottom:10px;color:var(--deep)}.articleV2Toc a{display:block;padding:6px 0;color:#315b72}
.fuelFactV2,.fuelInsightV2,.engineerV2{margin:28px 0;padding:24px 26px;border-radius:18px}.fuelFactV2{background:#fff6df;border:1px solid #efd087}.fuelInsightV2{background:#eaf5ff;border:1px solid #b8d9ee}.engineerV2{background:#edf8ef;border:1px solid #b8ddbd}.boxLabel{display:inline-flex;padding:5px 10px;border-radius:999px;font-size:12px;font-weight:950;letter-spacing:.08em;text-transform:uppercase;margin-bottom:10px}.fuelFactV2 .boxLabel{background:#f5c242;color:#17314a}.fuelInsightV2 .boxLabel{background:#0b6fba;color:#fff}.engineerV2 .boxLabel{background:#067647;color:#fff}
.mythV2{margin-top:42px}.mythV2 h2{margin-bottom:16px}.mythRow{display:grid;grid-template-columns:48px 1fr;gap:14px;padding:18px 20px;border:1px solid var(--line);border-radius:15px;margin:12px 0;background:#fff}.mythIcon{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;background:#ffe8e5;color:var(--red);font-weight:950}.mythRow.fact .mythIcon{background:#e6f5ec;color:var(--green)}
.articleFAQV2 details{border-bottom:1px solid var(--line);padding:16px 0}.articleFAQV2 summary{font-weight:850;cursor:pointer;color:#123f63}.articleFAQV2 p{padding-top:10px}
.articleSidebarV2{display:flex;flex-direction:column;gap:18px}.articleSidebarV2 .sideCard{padding:22px}.articleSidebarV2 .stickyCard{top:92px}.sideCard .miniList{display:grid;gap:10px}.sideCard .miniList a{padding:10px 0;border-bottom:1px solid #edf1f3}.sideCtaV2{background:linear-gradient(145deg,#07375f,#0b6f89);color:#fff;border:0}.sideCtaV2 h3{color:#fff}.sideCtaV2 p{color:#d8ebf2}.sideCtaV2 .btn{width:100%;background:#f5c242;color:#17314a;box-shadow:none}.sideCtaV2 .textLink{color:#fff;text-align:center;margin-top:10px;display:block}
.articleEndCtaV2{background:#eef7f9;padding:48px 0}.articleEndCtaV2 .container{display:grid;grid-template-columns:1fr auto;gap:28px;align-items:center}.articleEndCtaV2 h2{margin:6px 0 10px;font-size:36px;color:var(--deep)}.articleEndCtaV2 p{max-width:760px;color:var(--muted)}.articleEndCtaV2 .actions{margin-top:0}
@media(max-width:980px){.articleV2Grid,.articleV2Layout{grid-template-columns:1fr}.articleSidebarV2{display:grid;grid-template-columns:1fr 1fr}.articleSidebarV2 .stickyCard{position:static}.infoFlow{grid-template-columns:1fr}.infoNode:not(:last-child):after{content:"↓";right:auto;left:50%;top:auto;bottom:-25px}.articleEndCtaV2 .container{grid-template-columns:1fr}.articleEndCtaV2 .actions{margin-top:8px}}
@media(max-width:640px){.articleV2Hero{padding-bottom:40px}.articleV2Hero h1{font-size:40px}.articleV2Deck{font-size:17px}.articleCoverV2{min-height:310px}.coverTank{transform:scale(.8);transform-origin:top left}.coverDropV2{transform:scale(.8) rotate(12deg);transform-origin:top right}.coverEngineV2{transform:scale(.8);transform-origin:bottom right}.articleV2Layout{padding-top:32px}.summary30{grid-template-columns:1fr}.learningOutcomesGrid,.articleSidebarV2{grid-template-columns:1fr}.articleV2Content{font-size:16px}.articleV2Content h2{font-size:28px}.articleInfographic{padding:22px}.articleEndCtaV2 h2{font-size:29px}.readingPath ol{display:grid}}

/* KB1.2 Delivery 2 — Premium Article #2 */
.ethanolCover{padding:18px;background:linear-gradient(145deg,#0b3549,#176982 60%,#2ca0bb);overflow:hidden}.ethanolCover svg{width:100%;height:auto;display:block}.ethanolInfographic svg{width:100%;height:auto;margin-top:20px}.ethanolInfographic .flowCard rect{fill:#f7fbfc;stroke:#c9e4ec;stroke-width:2}.ethanolInfographic .flowCard circle{fill:#e7f5f9}.ethanolInfographic .flowCard text{font-size:15px;font-weight:700;fill:#17384a}.ethanolInfographic .flowCard .smallSvg{font-size:12px;font-weight:500;fill:#52707e}.ethanolInfographic .warning rect{fill:#fff9e9;stroke:#efd17a}.ethanolInfographic .danger rect:first-child{fill:#fff3ef;stroke:#e6a28b}.exampleBox{margin:28px 0;padding:26px;border:1px solid #d6e6ec;border-left:5px solid #2b7895;border-radius:16px;background:#f8fbfc}.exampleBox p{margin:10px 0}.evidenceLevel{margin:38px 0;padding:28px;border-radius:20px;background:#eef7f9}.evidenceGrid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.evidenceGrid>div{padding:18px;background:#fff;border:1px solid #dcebef;border-radius:14px}.evidenceGrid b{color:#174f66}.evidenceGrid p{margin-bottom:0;font-size:.94rem}.references a{text-decoration:underline;text-underline-offset:3px}.referenceNote{margin-top:20px;padding:16px;border-radius:12px;background:#f5f5f5;font-size:.92rem}.miniList span{display:block;padding:8px 0;color:#6c7d85;font-size:.94rem}@media(max-width:760px){.evidenceGrid{grid-template-columns:1fr}.ethanolInfographic{overflow-x:auto}.ethanolInfographic svg{min-width:820px}.ethanolCover{min-height:auto}}

/* KB1.2 Delivery 3 — Phase Separation article */
.phaseHero{background:linear-gradient(135deg,#0e3045 0%,#14546d 52%,#0b2537 100%)}
.phaseCover{background:linear-gradient(150deg,#163f56,#237a91)}
.difficulty.medium{color:#f0bb49}
.phaseCompare{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:22px 0}
.phaseCompare>div{border:1px solid #dbe8ee;border-radius:18px;padding:22px;background:#fff}
.phaseCompare>div:first-child{border-top:5px solid #efaa3e}.phaseCompare>div:last-child{border-top:5px solid #348bb3}
.phaseCompare h3{margin-top:0}.phaseCompare ul{padding-left:20px;margin-bottom:0}
.symptomGrid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px;margin:20px 0}
.symptomGrid>div{padding:18px;border-radius:16px;background:#f5f9fb;border:1px solid #dbe8ee}.symptomGrid p{margin:7px 0 0}
.scenarioBox{margin:28px 0;padding:24px;border-radius:20px;background:#f7fafb;border:1px solid #d9e7ed}
.scenarioTimeline{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:18px 0}
.scenarioTimeline>div{background:#fff;border-radius:14px;padding:16px;border-top:4px solid #2b7895}.scenarioTimeline p{margin:7px 0 0}
.actionMatrix{display:grid;grid-template-columns:minmax(180px,.9fr) 1.4fr;border:1px solid #d4e3ea;border-radius:18px;overflow:hidden;margin:22px 0}
.actionMatrix>div{padding:16px 18px;border-bottom:1px solid #dce8ed}.actionMatrix>div:nth-last-child(-n+2){border-bottom:0}.actionMatrix>div:nth-child(odd){border-right:1px solid #dce8ed}.actionHead{background:#173f55;color:#fff;font-weight:800}
.warningBoxV2{padding:22px 24px;border-radius:18px;background:#fff5e8;border:1px solid #f0c78e;margin:24px 0}.warningBoxV2 .boxLabel{color:#a65d16}.warningBoxV2 ul{margin-bottom:0}
.phaseInfographic .phaseStage rect:first-child{fill:#fff;stroke:#d7e6ed;stroke-width:2}.phaseInfographic .phaseStage.warning rect:first-child{stroke:#e9b25b}.phaseInfographic .phaseStage.danger rect:first-child{stroke:#d96b58}.phaseInfographic .phaseStage text{font-size:17px;font-weight:700;fill:#173548}.phaseInfographic .phaseStage .smallSvg{font-size:13px;font-weight:500;fill:#55707e}.phaseInfographic .phaseStage .stageNo{font-size:20px;fill:#2b7895}
@media(max-width:760px){.phaseCompare,.symptomGrid,.scenarioTimeline{grid-template-columns:1fr}.actionMatrix{grid-template-columns:1fr}.actionMatrix>div:nth-child(odd){border-right:0}.actionMatrix .actionHead:nth-child(2){display:none}.actionMatrix>div:nth-child(odd):not(.actionHead){font-weight:800;background:#f4f8fa;border-bottom:0;padding-bottom:6px}.phaseInfographic svg{min-width:850px}.phaseInfographic{overflow-x:auto}}


/* KB1.2 final: internal linking, CTA and SEO-supporting UI */
.relatedHub{margin:42px 0 34px;padding:28px;border:1px solid #dfe8ec;border-radius:22px;background:#f8fbfc}
.relatedHub>h2{margin-top:0}.relatedHub>p{color:#52636b}
.relatedHubGrid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:18px}
.relatedHubCard{display:flex;flex-direction:column;gap:9px;padding:18px;border:1px solid #dce7eb;border-radius:16px;background:#fff;text-decoration:none;color:inherit;transition:.2s ease}
.relatedHubCard:hover{transform:translateY(-2px);border-color:#0f7891;box-shadow:0 10px 26px rgba(17,64,77,.08)}
.relatedHubCard strong{font-size:17px;color:#143f4d}.relatedHubCard span{font-size:14px;line-height:1.55;color:#5d6c72}.relatedHubCard em{font-style:normal;font-weight:700;color:#08768f;margin-top:auto}
.useCaseCta{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;min-width:min(100%,500px)}
.useCaseChoice{display:flex;flex-direction:column;gap:5px;padding:15px 16px;border:1px solid rgba(255,255,255,.32);border-radius:14px;color:#fff;text-decoration:none;background:rgba(255,255,255,.08)}
.useCaseChoice:hover{background:rgba(255,255,255,.15)}.useCaseChoice span{font-size:13px;color:#d9f2f7}
@media(max-width:850px){.relatedHubGrid{grid-template-columns:1fr}.useCaseCta{grid-template-columns:1fr;min-width:0}.articleEndCtaV2 .container{display:block}.articleEndCtaV2 .useCaseCta{margin-top:20px}}