
:root{--ink:#101820;--muted:#5b6670;--line:#d8dee6;--paper:#f6f8fa;--brand:#00478a;--deep:#111827;--steel:#26323f;--blue:#00478a;--accent:#f2b544;--white:#fff;--max:1240px}
*{box-sizing:border-box}html{font-family:Inter,Arial,Helvetica,sans-serif;color:var(--ink);scroll-behavior:smooth}body{margin:0;background:#fff;line-height:1.6}a{color:inherit}img{max-width:100%;height:auto}main{overflow:hidden}
.topbar{background:#0f1720;color:#e5edf5;font-size:13px}.topbar .wrap,.header .wrap,.wrap{max-width:var(--max);margin:auto;padding:0 24px}.topbar .wrap{display:flex;justify-content:space-between;gap:20px;padding-top:8px;padding-bottom:8px}.header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}.header .wrap{display:flex;align-items:center;justify-content:space-between;min-height:74px;gap:24px}.logo{display:flex;align-items:center;gap:12px;text-decoration:none;font-weight:800}.logo img{width:152px;height:42px;object-fit:contain}.nav{display:flex;gap:18px;align-items:center;font-size:14px;font-weight:650}.nav a{text-decoration:none;color:#1f2933}.nav a:hover{color:var(--brand)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--brand);color:white;text-decoration:none;border:0;border-radius:4px;padding:12px 18px;font-weight:750;min-height:44px}.btn.secondary{background:#182434}.btn.ghost{background:white;color:var(--brand);border:1px solid var(--brand)}.hero{position:relative;background:#111827;color:white}.hero:before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(10,15,22,.94),rgba(10,15,22,.66),rgba(10,15,22,.18));z-index:1}.hero img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}.hero .wrap{position:relative;z-index:2;min-height:650px;display:grid;align-content:center;padding-top:90px;padding-bottom:80px}.eyebrow{color:var(--accent);font-weight:800;text-transform:uppercase;letter-spacing:.08em;font-size:13px}.hero h2{font-size:58px;line-height:1.02;max-width:870px;margin:14px 0 18px;letter-spacing:0}.hero p{max-width:760px;font-size:19px;color:#e3e8ef}.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:18px}.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:42px;max-width:900px}.metric{border:1px solid rgba(255,255,255,.22);background:rgba(255,255,255,.08);padding:18px;border-radius:6px}.metric strong{display:block;font-size:26px;color:#fff}.section{padding:84px 0}.section.alt{background:var(--paper)}.section.dark{background:#101820;color:white}.section h2{font-size:38px;line-height:1.16;margin:0 0 18px}.section-lead{max-width:820px;color:var(--muted);font-size:18px}.dark .section-lead{color:#d7dde6}.grid{display:grid;gap:22px}.grid.cols-2{grid-template-columns:repeat(2,1fr)}.grid.cols-3{grid-template-columns:repeat(3,1fr)}.grid.cols-4{grid-template-columns:repeat(4,1fr)}.card,.image-card{background:#fff;border:1px solid var(--line);border-radius:6px;text-decoration:none;display:block;min-height:100%;overflow:hidden}.card{padding:24px}.card:hover,.image-card:hover{border-color:#9aa8b7;box-shadow:0 14px 34px rgba(16,24,32,.08)}.card h3,.image-card h3{margin:0 0 10px;font-size:21px;line-height:1.25}.card p,.image-card p{color:var(--muted);margin:0}.image-grid{align-items:stretch}.image-card{background:#fff}.image-card img{display:block;width:100%;aspect-ratio:16/10;height:auto;object-fit:cover;background:#eef2f6;border-bottom:1px solid var(--line)}.image-card-body{padding:18px 18px 20px}.card-badge{display:inline-flex;margin-bottom:10px;color:var(--brand);font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.08em}.dark .card,.dark .image-card{background:#172333;border-color:#2c3c4f;color:#fff}.dark .card p,.dark .image-card p{color:#c7d2df}.split{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}.media-frame img{border-radius:6px;border:1px solid var(--line);box-shadow:0 22px 48px rgba(17,24,39,.16)}.breadcrumb{font-size:13px;color:#d4e2f4;padding:18px 0}.breadcrumb a{text-decoration:none;color:#fff}.page-hero{background:#111827;color:#fff;padding:76px 0}.page-hero h1{font-size:46px;line-height:1.08;max-width:920px;margin:10px 0 16px}.page-hero p{max-width:820px;color:#d7dde6;font-size:18px}.toc{border:1px solid var(--line);background:#fff;border-radius:6px;padding:14px 16px;margin:0 0 34px;display:flex;flex-wrap:wrap;gap:10px;align-items:center}.toc strong{margin-right:8px;color:#0f1720}.toc a{display:inline-flex;align-items:center;min-height:36px;color:#334155;text-decoration:none;padding:7px 12px;border:1px solid #dce3eb;border-radius:4px;background:#f8fafc}.toc a:hover{border-color:var(--brand);color:var(--brand);background:#eef7ff}.content h2{font-size:30px;margin-top:42px}.content h3{font-size:22px;margin-top:28px}.content ul{padding-left:22px}.content li{margin:8px 0}.spec-table{width:100%;border-collapse:collapse;margin:24px 0}.spec-table th,.spec-table td{border:1px solid var(--line);padding:13px;text-align:left}.spec-table th{background:#eef2f6}.faq details{border:1px solid var(--line);border-radius:6px;background:#fff;margin:10px 0;padding:16px}.faq summary{font-weight:800;cursor:pointer}.technical-accordion{display:grid;gap:12px;margin:22px 0 30px}.technical-accordion details{border:1px solid var(--line);border-radius:6px;background:#fff;overflow:hidden}.technical-accordion details[open]{border-color:#b7c6d6;box-shadow:0 10px 28px rgba(16,24,32,.06)}.technical-accordion summary{cursor:pointer;list-style:none;position:relative;padding:17px 52px 17px 18px;font-weight:800;color:#122033;background:#f8fafc}.technical-accordion summary::-webkit-details-marker{display:none}.technical-accordion summary:after{content:"+";position:absolute;right:18px;top:50%;transform:translateY(-50%);width:26px;height:26px;border-radius:4px;background:var(--brand);color:#fff;display:grid;place-items:center;font-weight:900;line-height:1}.technical-accordion details[open] summary{background:#eef6ff;color:var(--brand)}.technical-accordion details[open] summary:after{content:"-"}.accordion-body{padding:18px 20px 20px}.accordion-body p:first-child{margin-top:0}.accordion-body p:last-child{margin-bottom:0}.cta-band{background:var(--brand);color:#fff;padding:40px;border-radius:6px;display:grid;grid-template-columns:1fr auto;gap:20px;align-items:center;margin-top:44px}.form{display:grid;gap:12px;background:#fff;color:#111827;border:1px solid var(--line);border-radius:6px;padding:22px}.form input,.form textarea,.form select{width:100%;border:1px solid #cbd5df;border-radius:4px;padding:12px;font:inherit}.video-box{aspect-ratio:16/9;background:#0f1720;border-radius:6px;overflow:hidden;border:1px solid #263445;display:grid;place-items:center}.video-box iframe{width:100%;height:100%;border:0}.video-poster{position:relative;width:100%;height:100%;border:0;background:#0f1720;color:#fff;font:inherit;font-weight:800;cursor:pointer;display:grid;place-items:center;overflow:hidden}.video-poster:before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,23,32,.05),rgba(15,23,32,.62));z-index:1}.video-poster img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}.video-poster span{position:relative;z-index:2;display:inline-flex;border:1px solid rgba(255,255,255,.75);background:rgba(0,71,138,.92);padding:12px 18px;border-radius:4px}.footer{background:#0f1720;color:#dce5ef;padding:64px 0 24px}.footer-grid{display:grid;grid-template-columns:1.35fr repeat(4,1fr);gap:24px}.footer a{color:#dce5ef;text-decoration:none;margin:7px 0}.footer h3{color:white}.subfooter{border-top:1px solid #2c3846;margin-top:36px;padding-top:20px;color:#aeb9c5;font-size:13px}.tag-list{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0}.tag-list a{border:1px solid #cbd5df;border-radius:999px;padding:6px 10px;text-decoration:none;color:#334155;font-size:13px}.notice{border-left:4px solid var(--blue);background:#eef7fb;padding:16px 18px;margin:24px 0}.skip-link{position:absolute;left:-999px;top:auto}.skip-link:focus{left:16px;top:16px;background:#fff;color:#000;z-index:100;padding:10px}
@media (max-width:960px){.nav{display:none}.hero h2{font-size:40px}.hero .wrap{min-height:560px}.metrics,.grid.cols-4,.grid.cols-3,.grid.cols-2,.split,.footer-grid,.cta-band{grid-template-columns:1fr}.section{padding:58px 0}.page-hero h1{font-size:34px}.toc{align-items:flex-start}.toc strong{flex:0 0 100%;margin:0}.toc a{flex:1 1 130px}.topbar .wrap{display:block}.header .wrap{min-height:66px}.logo img{width:130px}}

.nav-item{position:relative;display:inline-flex;align-items:center;min-height:74px}.nav-item>a:after{content:"";display:inline-block;margin-left:6px;border-left:4px solid transparent;border-right:4px solid transparent;border-top:5px solid currentColor;vertical-align:middle}.nav-menu{position:absolute;left:0;top:100%;z-index:80;min-width:280px;display:none;padding:10px;background:#fff;border:1px solid var(--line);box-shadow:0 18px 42px rgba(16,24,32,.16)}.nav-menu a{display:block;padding:10px 12px;border-radius:4px;white-space:nowrap;color:#1f2933}.nav-menu a:hover,.nav-menu a:focus{background:#eef6ff;color:var(--brand)}.nav-item:hover .nav-menu,.nav-item:focus-within .nav-menu{display:block}
.page-hero{position:relative;background:#111827 url("/assets/images/hualu-page-hero-banner.webp") center 46%/cover no-repeat;color:#fff;overflow:hidden}.page-hero:before{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(10,18,31,.88),rgba(10,18,31,.68),rgba(10,18,31,.36));z-index:0}.page-hero .wrap{position:relative;z-index:1}.page-hero p{color:#eef4fb}
@media (max-width:960px){.page-hero{background-position:center center}.page-hero:before{background:linear-gradient(90deg,rgba(10,18,31,.9),rgba(10,18,31,.72))}}
