:root{--bg:#080b0d;--panel:#101418;--panel2:#171c20;--line:#2b3136;--text:#f6f7f7;--muted:#aeb4b9;--light:#f4f4f2;--orange:#ef7415;--max:1280px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:118px}body{margin:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:var(--text);line-height:1.5}a{text-decoration:none;color:inherit}img{display:block;max-width:100%}
.container{width:min(var(--max),calc(100% - 48px));margin:auto}.header{position:absolute;inset:0 0 auto 0;z-index:50}.header-inner{height:78px;display:flex;align-items:center;gap:18px}.brand{display:flex;align-items:center;gap:10px;margin-right:auto}.brand img{width:44px;height:44px;object-fit:cover;border-radius:7px}.brand strong{display:block;font-size:18px;line-height:1}.brand span{font-size:11px;letter-spacing:.16em}.nav{display:flex;gap:15px;font-size:11px;font-weight:700;text-transform:uppercase;overflow:visible}.nav a:hover,.nav a.active{color:var(--orange)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 20px;background:var(--orange);border:1px solid var(--orange);font-size:11px;font-weight:800;text-transform:uppercase}.btn.outline{background:transparent;border-color:#656b70}.text-link{font-size:11px;color:var(--orange);font-weight:800;text-transform:uppercase}
.nav-item{position:relative;display:flex;align-items:center}.nav-item>a{display:flex;align-items:center;gap:4px}.nav-item.has-menu>a:after{content:"▾";font-size:8px;opacity:.75}.nav-menu{display:none;position:absolute;top:100%;left:0;min-width:240px;background:#0d1114;border:1px solid #2b3136;padding:10px 0;box-shadow:0 14px 30px rgba(0,0,0,.35);z-index:999}.nav-item:hover>.nav-menu,.nav-item:focus-within>.nav-menu{display:block}.nav-menu a{display:block!important;padding:9px 14px;color:#d6dade!important;font-size:10px!important;text-transform:none!important;font-weight:600!important;white-space:nowrap}.nav-menu a:hover{background:#181d21;color:var(--orange)!important}

.hero{min-height:610px;position:relative;overflow:hidden;background:#06090b}.hero-bg{position:absolute;inset:0;background:url('../images/engineering_hero.jpg') center center/cover no-repeat}.hero-bg:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(6,9,11,.97) 0%,rgba(6,9,11,.82) 31%,rgba(6,9,11,.30) 60%,rgba(6,9,11,.08) 100%)}.hero-copy{position:relative;z-index:2;padding-top:145px;max-width:700px}.eyebrow,.section-kicker{font-size:11px;color:var(--orange);font-weight:800;letter-spacing:.13em;text-transform:uppercase}.hero h1{font-size:62px;line-height:.98;margin:10px 0 12px;text-transform:uppercase}.hero .tagline{font-size:25px;color:var(--orange);font-weight:800;margin-bottom:16px;max-width:660px}.hero p{font-size:15px;color:#d4d8da;max-width:610px}.hero-actions{display:flex;gap:14px;margin-top:27px}

.engineering-nav{position:sticky;top:0;z-index:35;background:#0d1114;border-top:1px solid #262c31;border-bottom:1px solid #262c31}.engineering-nav-inner{display:flex;gap:26px;overflow-x:auto;scrollbar-width:none}.engineering-nav-inner::-webkit-scrollbar{display:none}.engineering-nav a{padding:15px 0;font-size:10px;font-weight:800;text-transform:uppercase;color:#b5bbc0;white-space:nowrap}.engineering-nav a:hover{color:var(--orange)}

.section{padding:72px 0}.light{background:var(--light);color:#15181a}.dark{background:#0c1013}.section-title{margin-top:7px}.section-title h2{font-size:31px;line-height:1.15;text-transform:uppercase;margin:0 0 11px}.section-title h2:after{content:"";display:inline-block;width:30px;height:3px;background:var(--orange);margin-left:11px;vertical-align:middle}.section-title p{font-size:13px;color:#5d6266;margin:0}.dark .section-title p{color:#aeb4b9}.lead{font-size:14px;color:#596065;max-width:760px}.light-lead{color:#b8bec2}.two-col{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}.two-col.reverse{grid-template-columns:.95fr 1.05fr}.visual-panel{position:relative;background:#151a1e;border:1px solid #32383d;overflow:hidden;min-height:330px}.visual-panel img{width:100%;height:330px;object-fit:cover}.visual-caption{position:absolute;left:0;right:0;bottom:0;background:linear-gradient(0deg,rgba(0,0,0,.88),transparent);padding:44px 18px 15px;color:#d5d9dc;font-size:10px}

.engineering-flow{display:grid;grid-template-columns:1fr auto 1fr auto 1fr auto 1fr auto 1fr auto 1fr;gap:10px;align-items:stretch;margin-top:34px}.flow-node{background:#fff;border:1px solid #d7dbde;padding:18px;min-height:164px}.flow-node span{color:var(--orange);font-size:10px;font-weight:800}.flow-node strong{display:block;font-size:11px;text-transform:uppercase;margin:9px 0}.flow-node p{font-size:10px;color:#5d6266;margin:0}.flow-arrow{display:flex;align-items:center;color:var(--orange);font-size:24px}

.mini-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:22px}.mini{border:1px solid #2b3136;background:#11161a;padding:17px}.mini strong{display:block;font-size:11px;text-transform:uppercase;margin-bottom:6px}.mini span{font-size:10px;color:#aeb4b9}

.criteria-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:22px}.criteria-grid>div{border:1px solid #d4d8db;background:#fff;padding:16px}.criteria-grid strong{display:block;font-size:11px;text-transform:uppercase;margin-bottom:5px}.criteria-grid span{font-size:10px;color:#60666a}
.coverage-overlay{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:flex-end;padding:18px;background:linear-gradient(180deg,transparent 30%,rgba(7,10,12,.86) 100%)}.coverage-title{font-size:10px;font-weight:800;color:#fff}.coverage-map{display:flex;height:72px;margin:8px 0;overflow:hidden;border-radius:3px}.coverage-map span{flex:1}.coverage-map span:nth-child(1){background:rgba(239,116,21,.92)}.coverage-map span:nth-child(2){background:rgba(239,156,21,.82)}.coverage-map span:nth-child(3){background:rgba(229,195,48,.72)}.coverage-map span:nth-child(4){background:rgba(91,169,180,.60)}.coverage-map span:nth-child(5){background:rgba(75,112,168,.48)}.coverage-axis{font-size:9px;color:#d5d9dc}

.system-architecture{display:grid;grid-template-columns:1fr auto 1fr auto 1fr auto 1.2fr 1.1fr;gap:12px;align-items:center;margin-top:30px}.system-node{padding:22px 17px;border:1px solid #30363b;background:#11161a;min-height:112px}.system-node span{font-size:9px;color:var(--orange);font-weight:800}.system-node strong{display:block;margin-top:8px;font-size:12px;text-transform:uppercase}.system-node.primary{border-color:var(--orange);background:#17120e}.system-arrow{color:var(--orange);font-size:23px}.branch-wrap{display:grid;gap:8px}.branch{border:1px solid #30363b;padding:10px 12px;background:#11161a}.branch strong{display:block;font-size:10px;text-transform:uppercase}.branch span{font-size:9px;color:#9fa6ab}.section-actions{display:flex;align-items:center;gap:24px;margin-top:28px}

.simulation-list{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:22px}.simulation-list>div{border-left:2px solid var(--orange);padding:10px 14px;background:#fff}.simulation-list span{font-size:9px;color:var(--orange);font-weight:800}.simulation-list strong{display:block;font-size:11px;text-transform:uppercase;margin:3px 0}.simulation-list p{font-size:10px;color:#60666a;margin:0}.truth-note{margin-top:18px;padding:12px 14px;border:1px solid #efc18f;background:#fff5e9;color:#7a4211;font-size:10px}.dark-note{background:#1b140d;color:#e6c093;border-color:#5e4325}
.simulation-screen{background:#0f1418;border:1px solid #343a3f;padding:15px;min-height:370px}.screen-head{font-size:9px;color:#aeb4b9;border-bottom:1px solid #2b3136;padding-bottom:9px}.venue-outline{position:relative;height:270px;margin-top:14px;border:1px solid #2e353a;background:linear-gradient(180deg,#151b20,#0a0e11);overflow:hidden}.stage{position:absolute;left:15px;top:95px;width:70px;height:78px;background:#333a40;display:flex;align-items:center;justify-content:center;font-size:9px}.speaker-dot{position:absolute;left:82px;top:120px;width:8px;height:8px;border-radius:50%;background:var(--orange);z-index:3}.beam{position:absolute;left:88px;top:122px;height:16px;transform-origin:left center;border-radius:0 50% 50% 0}.b1{width:75%;background:linear-gradient(90deg,rgba(239,116,21,.65),rgba(239,116,21,.06));transform:rotate(-22deg)}.b2{width:78%;background:linear-gradient(90deg,rgba(239,176,21,.56),rgba(239,176,21,.04));transform:rotate(-8deg)}.b3{width:80%;background:linear-gradient(90deg,rgba(141,194,83,.42),rgba(141,194,83,.03));transform:rotate(7deg)}.b4{width:74%;background:linear-gradient(90deg,rgba(65,144,186,.38),rgba(65,144,186,.03));transform:rotate(22deg)}.audience{position:absolute;right:18px;bottom:18px;font-size:9px;color:#879199}.legend{display:flex;gap:15px;margin-top:10px;font-size:8px;color:#9aa2a8}.legend span:before{content:"";display:inline-block;width:8px;height:8px;margin-right:5px;background:var(--orange)}.legend span:nth-child(2):before{background:#95bd69}.legend span:nth-child(3):before{background:#4d8bab}

.testing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:28px}.test-card{border:1px solid #2b3136;background:#11161a;padding:20px;min-height:150px}.test-card .icon{color:var(--orange);font-weight:800;font-size:10px}.test-card strong{display:block;font-size:11px;text-transform:uppercase;margin:9px 0}.test-card p{font-size:10px;color:#aeb4b9;margin:0}

.production-steps{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:22px}.production-steps div{background:#fff;border:1px solid #d4d8db;padding:16px}.production-steps strong{display:block;font-size:11px;text-transform:uppercase}.production-steps span{font-size:10px;color:#60666a}

.quality-flow{display:grid;grid-template-columns:1fr auto 1fr auto 1fr auto 1fr auto 1fr auto 1fr;gap:9px;align-items:center;margin-top:30px}.quality-flow>div:not(.q-arrow){border:1px solid #2b3136;background:#11161a;padding:19px;min-height:110px}.quality-flow span{font-size:9px;color:var(--orange);font-weight:800}.quality-flow strong{display:block;font-size:10px;text-transform:uppercase;margin:8px 0 4px}.quality-flow small{font-size:9px;color:#aeb4b9}.q-arrow{color:var(--orange);font-size:22px}

.application-proof-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:28px}.application-proof-grid article{background:#fff;border:1px solid #d7dbde}.application-proof-grid img{width:100%;height:170px;object-fit:cover}.application-proof-grid article>div{padding:18px}.application-proof-grid strong{font-size:12px;text-transform:uppercase}.application-proof-grid p{font-size:10px;color:#60666a}.application-proof-grid a{font-size:10px;color:var(--orange);font-weight:800;text-transform:uppercase}

.connect-grid{display:grid;grid-template-columns:1fr 1fr;gap:35px;align-items:center}.project-placeholder{min-height:240px;border:1px dashed #545b60;background:#11161a;padding:28px;display:flex;flex-direction:column;justify-content:center}.project-placeholder strong{font-size:18px;color:var(--orange)}.project-placeholder span{font-size:12px;margin:10px 0}.project-placeholder small{font-size:10px;color:#9fa6ab}

.resource-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:25px}.resource-cards a{display:block;background:#fff;border:1px solid #d7dbde;padding:20px}.resource-cards strong{display:block;font-size:12px;text-transform:uppercase;margin-bottom:7px}.resource-cards span{font-size:10px;color:#60666a}.resource-cards a:hover{border-color:var(--orange)}

.final-cta{background:#11161a;border-top:1px solid #2b3136;padding:38px 0}.final-cta-inner{display:flex;justify-content:space-between;align-items:center;gap:30px}.final-cta h2{font-size:29px;margin:5px 0;text-transform:uppercase}.final-cta p{margin:0;color:#aeb4b9;font-size:12px}

footer{background:#07090b;border-top:1px solid #23292e;padding:42px 0 20px}.footer-grid{display:grid;grid-template-columns:1.6fr repeat(4,1fr);gap:25px}.footer-grid h4{font-size:11px;text-transform:uppercase;margin:0 0 12px}.footer-grid a{display:block;color:#aab1b6;font-size:11px;margin:7px 0}.footer-brand p{font-size:11px;color:#999fa4}.footer-bottom{margin-top:28px;padding-top:15px;border-top:1px solid #20252a;color:#777f84;font-size:10px;display:flex;justify-content:space-between}
@media(max-width:1100px){.nav{display:none}.engineering-flow{grid-template-columns:repeat(3,1fr)}.flow-arrow{display:none}.system-architecture{grid-template-columns:1fr 1fr}.system-arrow{display:none}.quality-flow{grid-template-columns:repeat(3,1fr)}.q-arrow{display:none}}
@media(max-width:850px){.container{width:calc(100% - 30px)}.two-col,.two-col.reverse,.connect-grid{grid-template-columns:1fr}.testing-grid,.application-proof-grid,.resource-cards{grid-template-columns:1fr 1fr}.engineering-flow{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr 1fr}.final-cta-inner{align-items:flex-start;flex-direction:column}}
@media(max-width:560px){.hero{min-height:660px}.hero h1{font-size:43px}.hero .tagline{font-size:20px}.hero-actions{flex-direction:column;align-items:flex-start}.engineering-nav{top:0}.engineering-flow,.mini-grid,.criteria-grid,.simulation-list,.testing-grid,.production-steps,.quality-flow,.application-proof-grid,.resource-cards,.system-architecture,.footer-grid{grid-template-columns:1fr}.visual-panel,.visual-panel img{min-height:260px;height:260px}.section{padding:52px 0}.section-title h2{font-size:25px}}

/* V7 FINAL — selected YASHWEI Logo Option 2 */
.header .brand img,
.brand img{
  width:168px!important;
  height:45px!important;
  object-fit:contain!important;
  border-radius:0!important;
  flex:0 0 auto!important;
}
.header .brand > div,
.brand > div{
  display:none!important;
}
@media(max-width:760px){
  .header .brand img,
  .brand img{
    width:138px!important;
    height:38px!important;
  }
}
/* V10 — unified L1 hero image treatment */
.hero-bg{inset:0!important;background-position:center center!important;background-size:cover!important;background-repeat:no-repeat!important;}