:root{--eng-bg:#0b0d0e;--eng-panel:#11171b;--eng-panel2:#151d22;--eng-border:#27333b;--eng-text:#f5f7f8;--eng-muted:#b9c4cb;--eng-accent:#ff7a1a;--eng-teal:#0f778b}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(1100px 540px at 50% -220px,#18313a 0%,#0b0d0e 58%);color:var(--eng-text);font:16px/1.65 system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,"Helvetica Neue",Arial}a{color:inherit}.eng-hero{position:relative;min-height:520px;display:flex;align-items:end;background-image:linear-gradient(90deg,rgba(4,8,10,.88) 0%,rgba(4,8,10,.68) 48%,rgba(4,8,10,.22) 100%),var(--hero-image);background-size:cover;background-position:center;border-bottom:1px solid var(--eng-border)}.eng-hub-hero{min-height:440px}.eng-hero-inner{width:min(1240px,calc(100% - 36px));margin:0 auto;padding:72px 0 64px}.eng-breadcrumb{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:.88rem;color:#d3dde2;margin-bottom:28px}.eng-breadcrumb a{text-decoration:none}.eng-breadcrumb a:hover{color:#fff}.eng-eyebrow,.eng-kicker{text-transform:uppercase;letter-spacing:.14em;font-weight:800;font-size:.78rem;color:#8fd1dd;margin:0 0 10px}.eng-hero h1{font-size:clamp(2.45rem,5.7vw,5.2rem);line-height:1.01;letter-spacing:-.045em;max-width:1040px;margin:0;text-wrap:balance}.eng-lead{max-width:880px;color:#d7e0e4;font-size:clamp(1.05rem,1.4vw,1.25rem);line-height:1.75;margin:24px 0 0}.eng-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}.eng-btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 18px;border-radius:12px;background:var(--eng-accent);color:#101214;text-decoration:none;font-weight:850;border:1px solid var(--eng-accent);box-shadow:0 10px 28px rgba(255,122,26,.16)}.eng-btn.ghost{background:rgba(10,15,18,.45);color:#fff;border-color:#5d6c75;box-shadow:none}.eng-section{width:min(1240px,calc(100% - 36px));margin:0 auto;padding:72px 0}.eng-section+.eng-section{border-top:1px solid rgba(39,51,59,.65)}.eng-section h2{font-size:clamp(1.8rem,3vw,3rem);line-height:1.1;letter-spacing:-.025em;margin:0 0 26px}.eng-section-lead{max-width:900px;color:var(--eng-muted);font-size:1.06rem;margin:-10px 0 30px}.eng-two{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(300px,.75fr);gap:44px;align-items:start}.eng-note,.eng-compliance{background:linear-gradient(180deg,#172127,#101619);border:1px solid var(--eng-border);border-radius:18px;padding:24px}.eng-note strong,.eng-compliance strong{font-size:1.06rem}.eng-note p,.eng-compliance p{color:var(--eng-muted);margin:9px 0 0}.eng-checks,.eng-deliver{list-style:none;padding:0;margin:0;display:grid;gap:12px}.eng-checks li,.eng-deliver li{position:relative;padding:13px 15px 13px 42px;background:#10161a;border:1px solid #222e35;border-radius:12px}.eng-checks li:before,.eng-deliver li:before{content:"✓";position:absolute;left:15px;color:var(--eng-accent);font-weight:900}.eng-grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.eng-card{background:linear-gradient(180deg,#141c21,#0f1518);border:1px solid var(--eng-border);border-radius:17px;padding:22px;min-height:220px}.eng-card h3{font-size:1.16rem;margin:0 0 10px}.eng-card p{color:var(--eng-muted);margin:0}.eng-steps-wrap{background:linear-gradient(180deg,rgba(17,25,29,.42),rgba(9,13,15,.2))}.eng-steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:14px}.eng-steps li{background:#11181c;border:1px solid var(--eng-border);border-radius:16px;padding:20px;min-height:190px}.eng-steps span{display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:var(--eng-accent);color:#111;font-weight:900;margin-bottom:18px}.eng-steps p{margin:0;color:#d8e0e4}.eng-tags{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:22px}.eng-tags span{padding:9px 12px;border-radius:999px;background:#132027;border:1px solid #2c424c;color:#dbe8ec;font-weight:700;font-size:.9rem}.eng-faq{display:grid;gap:12px}.eng-faq details{background:#11181c;border:1px solid var(--eng-border);border-radius:14px;padding:0 18px}.eng-faq summary{cursor:pointer;font-weight:800;padding:18px 0}.eng-faq p{color:var(--eng-muted);margin:0;padding:0 0 18px}.eng-related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.eng-related{display:flex;flex-direction:column;gap:7px;text-decoration:none;background:#11181c;border:1px solid var(--eng-border);border-radius:15px;padding:18px;transition:.2s}.eng-related:hover{transform:translateY(-2px);border-color:#4c626d}.eng-related small{color:#7fc2cf;text-transform:uppercase;letter-spacing:.1em;font-weight:800}.eng-related strong{font-size:1.05rem}.eng-cta{width:min(1240px,calc(100% - 36px));margin:18px auto 72px;display:flex;align-items:center;justify-content:space-between;gap:28px;background:linear-gradient(110deg,#18303a,#10181c 65%);border:1px solid #30505b;border-radius:22px;padding:34px}.eng-cta h2{font-size:clamp(1.7rem,3vw,2.65rem);line-height:1.1;margin:0 0 10px}.eng-cta p{color:#c9d5da;max-width:800px;margin:0}.eng-hub-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.eng-hub-card{display:flex;flex-direction:column;text-decoration:none;background:linear-gradient(180deg,#151e23,#0e1417);border:1px solid var(--eng-border);border-radius:18px;padding:23px;min-height:285px;transition:.2s}.eng-hub-card:hover{transform:translateY(-3px);border-color:#4c626d}.eng-hub-card span{font-size:.76rem;text-transform:uppercase;letter-spacing:.12em;color:#87c9d5;font-weight:800}.eng-hub-card h2{font-size:1.35rem;line-height:1.2;margin:16px 0 10px}.eng-hub-card p{color:var(--eng-muted);margin:0 0 18px}.eng-hub-card b{color:#ff9a4d;margin-top:auto}.eng-footer{border-top:1px solid var(--eng-border);background:#080b0d;padding:44px 18px 20px}.eng-footer-grid{width:min(1240px,100%);margin:auto;display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px}.eng-footer-grid>div{display:flex;flex-direction:column;gap:7px}.eng-footer-grid p{color:#98a6ae;max-width:48ch;margin:3px 0}.eng-footer-grid a{color:#c8d2d7;text-decoration:none}.eng-footer-grid a:hover{color:#fff}.eng-footer-bottom{width:min(1240px,100%);margin:28px auto 0;padding-top:18px;border-top:1px solid #1c252a;color:#77858d;font-size:.86rem}
@media(max-width:1050px){.eng-grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}.eng-steps{grid-template-columns:repeat(2,minmax(0,1fr))}.eng-hub-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.eng-related-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){.eng-hero{min-height:470px;background-image:linear-gradient(180deg,rgba(4,8,10,.58),rgba(4,8,10,.93) 78%),var(--hero-image);background-position:center}.eng-hero-inner{padding:48px 0 42px}.eng-hero h1{font-size:clamp(2.1rem,11vw,3.25rem)}.eng-two{grid-template-columns:1fr;gap:24px}.eng-grid-4,.eng-steps,.eng-hub-grid,.eng-related-grid{grid-template-columns:1fr}.eng-card,.eng-steps li{min-height:0}.eng-section{padding:48px 0}.eng-cta{display:block;padding:25px;margin-bottom:48px}.eng-cta .eng-btn{margin-top:20px}.eng-footer-grid{grid-template-columns:1fr}}


/* v3.1 UX hierarchy: keep SEO detail pages, simplify human navigation */
.eng-choice-intro{display:flex;align-items:end;justify-content:space-between;gap:28px;margin-bottom:28px}
.eng-choice-intro>div{max-width:820px}.eng-choice-intro p{margin:0;color:var(--eng-muted)}
.eng-path-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.eng-path-card{display:flex;flex-direction:column;min-height:260px;padding:24px;border-radius:20px;text-decoration:none;background:linear-gradient(155deg,#18252b,#101619 68%);border:1px solid #30414a;transition:transform .2s ease,border-color .2s ease,background .2s ease}
.eng-path-card:hover{transform:translateY(-3px);border-color:#63808c;background:linear-gradient(155deg,#1b2b32,#11191d 68%)}
.eng-path-index{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;background:#ff7a1a;color:#111;font-weight:950;margin-bottom:20px}
.eng-path-card h2{font-size:1.38rem!important;line-height:1.18!important;margin:0 0 10px!important}
.eng-path-card p{color:var(--eng-muted);margin:0 0 20px}.eng-path-card b{margin-top:auto;color:#ff9a4d}
.eng-group-stack{display:grid;gap:14px;margin-top:28px}
.eng-group{background:#10171b;border:1px solid var(--eng-border);border-radius:18px;overflow:hidden}
.eng-group summary{list-style:none;display:flex;align-items:center;justify-content:space-between;gap:20px;cursor:pointer;padding:22px 24px;font-weight:900;font-size:1.08rem}
.eng-group summary::-webkit-details-marker{display:none}.eng-group summary:after{content:'+';display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:#1b272d;color:#ff9a4d;font-size:1.25rem;flex:0 0 auto}
.eng-group[open] summary:after{content:'–'}.eng-group[open] summary{border-bottom:1px solid var(--eng-border)}
.eng-group-body{padding:18px 24px 24px}.eng-group-copy{color:var(--eng-muted);max-width:900px;margin:0 0 18px}
.eng-link-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.eng-link-item{display:flex;flex-direction:column;gap:4px;padding:14px 15px;border-radius:13px;background:#151e23;border:1px solid #26343c;text-decoration:none;transition:.2s}
.eng-link-item:hover{border-color:#526b76;transform:translateY(-1px)}.eng-link-item strong{font-size:.98rem}.eng-link-item small{color:#91a1aa;line-height:1.45}
.eng-simple-note{margin-top:22px;padding:16px 18px;border-left:3px solid #ff7a1a;background:#121a1e;color:#c7d1d6;border-radius:0 12px 12px 0}
@media(max-width:980px){.eng-path-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:700px){.eng-choice-intro{display:block}.eng-choice-intro .eng-btn{margin-top:16px}.eng-path-grid,.eng-link-grid{grid-template-columns:1fr}.eng-path-card{min-height:0}.eng-group summary{padding:18px}.eng-group-body{padding:15px 18px 20px}}
/* v3.1 compact directory heroes */
@media(max-width:760px){.eng-hub-hero{min-height:390px}.eng-hub-hero .eng-hero-inner{padding:42px 0 38px}.eng-hub-hero h1{font-size:clamp(2rem,10vw,2.85rem)}}