:root{--ink: #13211d;--ink-soft: #30443d;--muted: #66756f;--line: #dbe4df;--line-dark: #9fb1a8;--base: #f3f6f2;--surface: #ffffff;--surface-green: #e8f1eb;--brand: #1f6b52;--brand-dark: #123f34;--brand-strong: #0f563f;--rust: #b83a2d;--gold: #c89a35;--charcoal: #0b1411;--focus: #f2c94c;--radius: 8px;--ease: cubic-bezier(.19, 1, .22, 1)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:Microsoft YaHei,PingFang SC,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.65;background:var(--base)}body.dialog-open{overflow:hidden}a{color:inherit;text-decoration:none}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--focus);outline-offset:3px}button,input{font:inherit}button{cursor:pointer}img{display:block;max-width:100%}h1,h2,h3,p{margin-top:0}.wrap{width:min(1180px,calc(100% - 36px));margin:0 auto}.top-strip{color:#d7e5df;background:var(--charcoal)}.top-strip .wrap{display:flex;min-height:38px;align-items:center;justify-content:space-between;gap:18px;font-size:14px}.top-strip a{color:#fff;font-weight:700}.site-header{position:sticky;top:0;z-index:20;background:#f3f6f2f2;border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.nav-shell{display:grid;grid-template-columns:minmax(280px,1fr) auto auto;min-height:76px;gap:24px;align-items:center}.brand{display:flex;min-width:0;align-items:center;gap:12px}.brand img{width:48px;height:48px;object-fit:contain;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}.brand strong,.brand small{display:block}.brand strong{overflow:hidden;font-size:18px;line-height:1.2;text-overflow:ellipsis;white-space:nowrap}.brand small{color:var(--muted)}.site-nav{display:flex;gap:20px;align-items:center;color:var(--ink-soft);font-size:15px;white-space:nowrap}.site-nav a{padding:10px 0}.site-nav a:hover{color:var(--brand)}.menu-toggle{display:none;align-items:center;justify-content:center;width:46px;height:46px;padding:0;color:var(--ink);background:#fff;border:1px solid var(--line-dark);border-radius:6px}.menu-toggle span{position:absolute;width:20px;height:2px;background:currentColor;transition:transform .22s var(--ease),opacity .22s var(--ease)}.menu-toggle span:nth-child(1){transform:translateY(-7px)}.menu-toggle span:nth-child(3){transform:translateY(7px)}.menu-toggle strong{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}body.nav-open .menu-toggle span:nth-child(1){transform:rotate(45deg)}body.nav-open .menu-toggle span:nth-child(2){opacity:0}body.nav-open .menu-toggle span:nth-child(3){transform:rotate(-45deg)}.nav-action{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 16px;color:#fff;font-weight:800;background:var(--brand-dark);border-radius:6px}.hero{position:relative;min-height:calc(100svh - 114px);overflow:hidden;color:#fff;background:var(--charcoal)}.hero-bg,.hero-shade{position:absolute;inset:0}.hero-bg{width:100%;height:100%;object-fit:cover}.hero-shade{background:linear-gradient(90deg,#08120feb,#08120fbd 45%,#08120f3d),linear-gradient(0deg,rgba(8,18,15,.75) 0%,transparent 42%)}.hero-content{position:relative;display:grid;grid-template-columns:minmax(0,.98fr) minmax(320px,.46fr);min-height:calc(100svh - 114px);gap:clamp(34px,6vw,86px);align-items:center;padding:clamp(38px,6vw,78px) 0 clamp(54px,7vw,92px)}.page-label,.section-code{margin-bottom:14px;color:var(--gold);font-size:13px;font-weight:900;letter-spacing:.08em}h1{max-width:760px;margin-bottom:24px;font-size:clamp(44px,7vw,82px);line-height:1.05;letter-spacing:0;text-wrap:balance}.hero-lede{max-width:760px;margin-bottom:32px;color:#e7f0ec;font-size:clamp(17px,1.45vw,20px);text-wrap:pretty}.hero-actions,.service-actions,.dialog-actions{display:flex;flex-wrap:wrap;gap:12px}.btn,.btn-mini{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 18px;font-weight:850;border-radius:6px;transition:background-color .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease),transform .22s var(--ease)}.btn:hover,.btn-mini:hover{transform:translateY(-1px)}.btn-primary,.btn-mini{color:#fff;background:var(--rust);border:1px solid var(--rust)}.btn-primary:hover,.btn-mini:hover{background:#922b22;border-color:#922b22}.btn-quiet,.btn-mini-quiet{color:#fff;background:var(--brand);border:1px solid var(--brand)}.btn-quiet:hover,.btn-mini-quiet:hover{background:var(--brand-dark);border-color:var(--brand-dark)}.btn-ghost{color:#fff;border:1px solid rgba(255,255,255,.52)}.hero-panel{display:grid;background:#fffffff0;color:var(--ink);border-radius:var(--radius);overflow:hidden}.hero-panel div{padding:20px;border-bottom:1px solid var(--line)}.hero-panel div:last-child{border-bottom:0}.hero-panel span{display:block;margin-bottom:7px;color:var(--muted);font-size:13px}.hero-panel strong{display:block;line-height:1.35}.quick-entry{background:#fff;border-bottom:1px solid var(--line)}.quick-grid{display:grid;grid-template-columns:repeat(4,1fr)}.quick-item{display:grid;grid-template-columns:44px 1fr;gap:12px;min-height:142px;align-content:center;padding:24px 22px;border-right:1px solid var(--line)}.quick-item:last-child{border-right:0}.quick-item:hover{background:var(--surface-green)}.quick-item.is-strong{color:#fff;background:var(--brand-dark)}.quick-item.is-strong small{color:#d2e1dc}.quick-icon{display:grid;width:44px;height:44px;place-items:center;color:#fff;font-weight:900;background:var(--brand);border-radius:50%}.quick-item strong,.quick-item small{display:block}.quick-item small{grid-column:2;color:var(--muted)}.section{padding:clamp(74px,9vw,120px) 0}.section-tight{padding-bottom:30px}.split-head{display:grid;grid-template-columns:minmax(0,.82fr) minmax(300px,.52fr);gap:clamp(24px,5vw,72px);align-items:end}.split-head h2,.products-toolbar h2,.document-copy h2,.service-layout h2{margin-bottom:0;font-size:clamp(30px,4.8vw,58px);line-height:1.08;text-wrap:balance}.split-head>p,.products-toolbar p,.document-copy p,.service-layout p{margin-bottom:0;color:var(--ink-soft);text-wrap:pretty}.category-rail{display:flex;flex-wrap:wrap;gap:10px;margin-top:30px}.category-chip{min-height:42px;padding:0 16px;color:var(--ink-soft);background:#fff;border:1px solid var(--line-dark);border-radius:999px}.category-chip[aria-pressed=true]{color:#fff;background:var(--brand);border-color:var(--brand)}.products-section{padding-top:36px}.products-toolbar{display:grid;grid-template-columns:1fr minmax(280px,420px);gap:24px;align-items:end;margin-bottom:28px}.search-box{display:grid;gap:8px;color:var(--muted);font-size:14px;font-weight:800}.search-box input{width:100%;min-height:48px;padding:0 15px;color:var(--ink);background:#fff;border:1px solid var(--line-dark);border-radius:6px}.product-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px}.product-card{display:grid;min-height:430px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}.product-card.is-hidden{display:none}.product-topline{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:22px;color:var(--muted);font-size:13px}.product-topline b{color:var(--brand)}.product-card h3{margin-bottom:10px;color:var(--brand-dark);font-size:28px;line-height:1.16}.product-card p{color:var(--ink-soft)}.product-card dl{display:grid;gap:10px;margin:10px 0 22px}.product-card dl div{display:grid;grid-template-columns:74px 1fr;gap:12px}.product-card dt{color:var(--muted);font-size:13px;font-weight:800}.product-card dd{margin:0;color:var(--ink);font-weight:700}.card-actions{display:flex;flex-wrap:wrap;gap:10px;align-self:end}.btn-mini{min-height:40px;padding:0 14px;font-size:14px}.empty-state{display:grid;grid-template-columns:180px 1fr;gap:24px;align-items:center;margin-top:22px;padding:22px;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}.empty-state[hidden]{display:none}.empty-state img{width:180px;border-radius:6px}.document-section{color:#fff;background:var(--brand-dark)}.document-layout,.service-layout{display:grid;grid-template-columns:minmax(0,.82fr) minmax(320px,.64fr);gap:clamp(28px,6vw,76px);align-items:center}.document-copy p,.service-section .service-layout p{color:#dce9e5}.document-types{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}.document-types span{min-height:36px;padding:6px 12px;color:#fff;font-weight:800;border:1px solid rgba(255,255,255,.28);border-radius:999px}.document-visual,.service-visual{margin:0;overflow:hidden;background:#fff;border-radius:var(--radius)}.document-visual img,.service-visual img{width:100%;aspect-ratio:4 / 3;object-fit:cover}.document-visual figcaption{padding:14px 16px;color:var(--ink-soft)}.scenario-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;margin-top:34px;background:var(--line)}.scenario-grid article{min-height:184px;padding:24px;background:#fff}.scenario-grid strong{display:block;margin-bottom:16px;color:var(--brand-dark);font-size:22px}.scenario-grid span{color:var(--ink-soft)}.service-section{color:#fff;background:linear-gradient(90deg,#0b1411f5,#0b1411d1),url(../assets/pe-pipe-stock.jpg) center / cover}.flow-lane{display:grid;grid-template-columns:repeat(6,1fr);margin-top:36px;background:#ffffff14;border:1px solid rgba(255,255,255,.16)}.flow-lane div{min-height:150px;padding:18px;border-right:1px solid rgba(255,255,255,.16)}.flow-lane div:last-child{border-right:0}.flow-lane span{display:block;margin-bottom:20px;color:var(--gold);font-weight:900}.flow-lane strong,.flow-lane small{display:block}.flow-lane small{color:#dce9e5}.qr-section{background:#fff}.qr-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px;margin-top:34px}.qr-grid figure{margin:0;padding:20px;background:var(--base);border:1px solid var(--line);border-radius:var(--radius)}.qr-grid img{width:min(260px,100%);aspect-ratio:1;margin:0 auto 16px;object-fit:contain;background:#fff;border-radius:6px}.qr-link-image{display:block}.qr-grid figcaption{display:grid;gap:4px;text-align:center}.qr-grid span{color:var(--muted);font-size:13px;overflow-wrap:anywhere}.site-footer{color:#cbd8d2;background:var(--charcoal)}.footer-grid{display:grid;grid-template-columns:minmax(240px,1fr) auto minmax(260px,.7fr);gap:26px;align-items:center;padding:28px 0;font-size:14px}.footer-grid strong,.footer-grid span{display:block}.footer-grid nav{display:flex;flex-wrap:wrap;gap:14px}.footer-grid a{color:#fff;font-weight:800}.mobile-actions{position:fixed;right:12px;bottom:12px;left:12px;z-index:25;display:none;gap:10px;padding:10px;background:#fffffff5;border:1px solid var(--line);border-radius:var(--radius)}.mobile-actions a{display:inline-flex;flex:1;min-height:44px;align-items:center;justify-content:center;color:#fff;font-weight:900;background:var(--brand-dark);border-radius:6px}.doc-dialog{width:min(760px,calc(100% - 28px));padding:0;color:var(--ink);background:#fff;border:0;border-radius:var(--radius)}.doc-dialog::backdrop{background:#040b08a8}.dialog-shell{position:relative;padding:clamp(24px,4vw,38px)}.dialog-close{position:absolute;top:14px;right:14px;width:38px;height:38px;color:var(--ink);font-size:24px;line-height:1;background:var(--base);border:1px solid var(--line);border-radius:50%}.dialog-shell h2{margin-right:38px;margin-bottom:12px;font-size:clamp(28px,4vw,42px);line-height:1.1}.dialog-shell p{color:var(--ink-soft)}.dialog-specs{display:grid;gap:10px;margin:22px 0}.dialog-specs div{display:grid;grid-template-columns:108px 1fr;gap:14px;padding:12px;background:var(--base);border-radius:6px}.dialog-specs span{color:var(--muted);font-weight:900}@media(max-width:1080px){.nav-shell{grid-template-columns:1fr auto;padding:12px 0}.site-nav{grid-column:1 / -1;overflow-x:auto;padding-bottom:4px}.hero-content,.split-head,.products-toolbar,.document-layout,.service-layout,.footer-grid{grid-template-columns:1fr}.quick-grid,.scenario-grid{grid-template-columns:repeat(2,1fr)}.flow-lane{grid-template-columns:repeat(3,1fr)}}@media(max-width:720px){body{padding-bottom:74px}.top-strip{display:none}.wrap{width:min(100% - 24px,1180px)}.site-header{position:sticky}.nav-shell,.quick-grid,.product-grid,.scenario-grid,.flow-lane,.qr-grid,.empty-state,.dialog-specs div{grid-template-columns:1fr}.nav-shell{grid-template-columns:1fr auto}.brand strong{white-space:normal}.menu-toggle{position:relative;display:inline-flex}.site-nav{position:absolute;top:calc(100% + 8px);right:12px;left:12px;display:none;grid-column:auto;gap:0;overflow:hidden;padding:6px;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:var(--radius)}body.nav-open .site-nav{display:grid}.site-nav a{min-height:46px;padding:11px 12px;border-radius:6px}.site-nav a:hover{background:var(--surface-green)}.nav-action{display:none}.hero{min-height:auto}.hero-content{min-height:auto;padding:42px 0 34px}h1{font-size:clamp(38px,12vw,54px)}.hero-actions,.service-actions,.dialog-actions,.card-actions{align-items:stretch;flex-direction:column}.hero-actions a,.service-actions a,.dialog-actions a,.card-actions a,.card-actions button{width:100%}.quick-item{border-right:0;border-bottom:1px solid var(--line)}.quick-item:last-child{border-bottom:0}.product-card{min-height:auto}.product-card dl div{grid-template-columns:1fr;gap:2px}.empty-state img{width:150px}.flow-lane div{min-height:auto;border-right:0;border-bottom:1px solid rgba(255,255,255,.16)}.flow-lane div:last-child{border-bottom:0}.mobile-actions{display:flex}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}