/* 基础模块：系统字体与颜色变量避免额外字体请求。 */
:root{--ink:#091316;--ink-soft:#0e1c20;--panel:#12262a;--panel-raised:#173238;--line:rgba(194,226,222,.16);--text:#edf5f2;--muted:#a6bab9;--dim:#718887;--teal:#75d8c2;--blue:#70b8d0;--gold:#e3bf78;--shadow:0 22px 60px rgba(0,0,0,.28);--shell:min(1180px,calc(100% - 48px));font-family:"Microsoft YaHei","PingFang SC","Noto Sans CJK SC",system-ui,sans-serif;color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:84px;background:var(--ink)}body{margin:0;min-width:320px;background:var(--ink);color:var(--text);line-height:1.75;text-rendering:optimizeLegibility}img{display:block;max-width:100%;height:auto}a{color:inherit;text-decoration:none}button{font:inherit}button,a,summary{touch-action:manipulation}.shell{width:var(--shell);margin-inline:auto}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;z-index:100;left:16px;top:-56px;padding:9px 14px;background:var(--teal);color:#06201e;font-size:13px;transition:top .2s}.skip-link:focus{top:16px}.section{position:relative;padding:104px 0;overflow:clip}.section-deferred{content-visibility:auto;contain-intrinsic-size:auto 880px}h1,h2,h3,p{margin-top:0}h2{margin-bottom:16px;font-family:"Noto Serif SC","Songti SC",serif;font-size:clamp(35px,4.3vw,57px);font-weight:500;line-height:1.18;letter-spacing:-.045em}h2 span,h1 span{color:var(--teal)}h3{line-height:1.25}.lead,.section-intro{color:var(--muted);font-size:15px}.eyebrow{display:flex;align-items:center;gap:10px;margin-bottom:14px;color:var(--teal);font:600 10px/1.4 Arial,sans-serif;letter-spacing:.22em}.eyebrow::before{width:27px;height:1px;background:currentColor;content:""}.button{display:inline-flex;align-items:center;justify-content:space-between;gap:26px;min-height:46px;padding:11px 16px;font-size:12px;transition:transform .2s ease,background-color .2s ease,box-shadow .2s ease}.button-primary{background:var(--teal);color:#06201e;box-shadow:0 8px 30px rgba(117,216,194,.14)}.button-primary:hover{transform:translateY(-2px);background:#b0f2df;box-shadow:0 12px 34px rgba(117,216,194,.25)}.text-link{display:inline-flex;align-items:center;gap:11px;color:var(--text);font-size:12px}.text-link:hover{color:var(--teal)}

/* 开屏模块：原生 SVG 线稿和合成层动画，不增加首屏媒体请求。 */
html.intro-active,html.intro-active body{overflow:hidden}.intro-screen{display:none}.js .intro-screen{position:fixed;z-index:120;inset:0;display:grid;place-items:center;overflow:hidden;background:#071316;color:var(--text);isolation:isolate;animation:intro-failsafe .5s ease 6s forwards}.intro-screen::before{position:absolute;z-index:-2;inset:0;background:linear-gradient(120deg,#061215 7%,#0f282b 49%,#061215 92%);content:""}.intro-screen::after{position:absolute;z-index:-1;inset:0;opacity:.22;background-image:linear-gradient(rgba(155,236,213,.1) 1px,transparent 1px),linear-gradient(90deg,rgba(155,236,213,.1) 1px,transparent 1px);background-size:46px 46px;mask-image:linear-gradient(180deg,#000,transparent 76%);content:""}.intro-glow{position:absolute;z-index:-1;width:min(70vw,940px);aspect-ratio:1;border-radius:50%;background:radial-gradient(circle,rgba(91,211,186,.19),rgba(91,211,186,.05) 38%,transparent 70%);filter:blur(8px);animation:intro-glow 3.6s ease-in-out infinite}.intro-inner{width:min(100% - 48px,980px);padding:24px 0}.intro-topline{display:flex;justify-content:space-between;gap:20px;padding-bottom:17px;border-bottom:1px solid rgba(194,226,222,.22);color:#abc4bd;font:10px/1.2 Arial,sans-serif;letter-spacing:.18em;opacity:0;transform:translate3d(0,10px,0);animation:intro-fade-up .55s .1s ease forwards}.intro-scene{width:100%;margin:clamp(28px,6vh,54px) auto 0;opacity:0;transform:translate3d(0,18px,0);animation:intro-fade-up .8s .3s cubic-bezier(.2,.8,.2,1) forwards}.intro-scene svg{display:block;width:100%;height:auto;overflow:visible}.intro-roof,.intro-column,.intro-floor{fill:none;stroke:#a8d8cc;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}.intro-roof{stroke-opacity:.35}.intro-column{stroke-opacity:.28}.intro-floor{stroke-opacity:.19}.intro-draw{stroke-dasharray:1100;stroke-dashoffset:1100;animation:intro-line 1.35s cubic-bezier(.3,.8,.3,1) forwards}.intro-draw-a{animation-delay:.42s}.intro-draw-b{animation-delay:.62s}.intro-draw-c{animation-delay:.82s}.intro-draw-d{animation-delay:1.04s}.intro-crane{fill:#83d8c3;filter:drop-shadow(0 0 10px rgba(117,216,194,.45));transform-box:fill-box;transform-origin:center;opacity:0;animation:intro-crane-in .7s 1.1s cubic-bezier(.2,.9,.25,1) forwards}.intro-trolley,.intro-hook{transform-box:fill-box;transform-origin:center}.intro-trolley{animation:intro-trolley 2.8s 1.85s ease-in-out infinite alternate}.intro-hook-line,.intro-hook-shape{fill:none;stroke:#e8f7ef;stroke-width:3;stroke-linecap:round;stroke-linejoin:round}.intro-hook{animation:intro-hook 2.5s 1.9s ease-in-out infinite}.intro-copy-wrap{width:min(100%,660px);margin:clamp(-10px,-2vh,0) auto 0;text-align:center}.intro-mark{display:grid;width:44px;height:44px;margin:0 auto 18px;place-items:center;border:1px solid var(--teal);color:var(--teal);font:bold 13px Arial,sans-serif;letter-spacing:-.08em;opacity:0;transform:rotate(45deg) scale(.7);animation:intro-mark .58s 1.3s cubic-bezier(.18,.8,.3,1.4) forwards}.intro-mark span{transform:rotate(-45deg)}.intro-kicker{margin:0 0 13px;color:var(--teal);font:10px/1.2 Arial,sans-serif;letter-spacing:.2em;opacity:0;animation:intro-fade-up .55s 1.52s ease forwards}.intro-title{margin:0;font-family:"Noto Serif SC","Songti SC",serif;font-size:clamp(37px,5.5vw,67px);font-weight:500;line-height:1.15;letter-spacing:-.06em;opacity:0;transform:translate3d(0,15px,0);animation:intro-fade-up .68s 1.64s cubic-bezier(.2,.8,.2,1) forwards}.intro-title span{color:var(--teal)}.intro-copy{max-width:420px;margin:13px auto 0;color:#b4c8c2;font-size:13px;opacity:0;animation:intro-fade-up .55s 1.92s ease forwards}.intro-action-row{display:flex;align-items:center;justify-content:center;gap:16px;margin-top:25px;opacity:0;animation:intro-fade-up .55s 2.16s ease forwards}.intro-enter{border:0;cursor:pointer}.intro-progress{display:block;width:104px;height:1px;overflow:hidden;background:rgba(203,241,230,.26)}.intro-progress i{display:block;width:100%;height:100%;background:var(--teal);transform:translateX(-100%);animation:intro-progress 3.65s .2s linear forwards}.intro-skip{position:absolute;top:23px;right:clamp(18px,4vw,48px);z-index:1;border:0;background:transparent;color:#b8ccc6;font-size:11px;cursor:pointer}.intro-skip span{margin-left:7px;color:var(--teal);font-size:15px}.intro-screen.is-leaving{pointer-events:none;animation:intro-exit .56s cubic-bezier(.6,0,1,1) forwards}.intro-screen.is-leaving .intro-inner,.intro-screen.is-leaving .intro-glow{animation:none;transition:transform .56s cubic-bezier(.6,0,1,1),opacity .42s ease;transform:scale(1.035);opacity:0}.intro-screen.is-leaving .intro-skip{opacity:0;transition:opacity .2s ease}@keyframes intro-fade-up{to{opacity:1;transform:translate3d(0,0,0)}}@keyframes intro-line{to{stroke-dashoffset:0}}@keyframes intro-crane-in{to{opacity:1;transform:translate3d(0,0,0)}}@keyframes intro-trolley{from{transform:translateX(-30px)}to{transform:translateX(30px)}}@keyframes intro-hook{0%,100%{transform:translateY(0)}50%{transform:translateY(-12px)}}@keyframes intro-mark{to{opacity:1;transform:rotate(45deg) scale(1)}}@keyframes intro-progress{to{transform:translateX(0)}}@keyframes intro-glow{0%,100%{transform:scale(.88);opacity:.55}50%{transform:scale(1.08);opacity:1}}@keyframes intro-exit{to{opacity:0;visibility:hidden}}@keyframes intro-failsafe{to{opacity:0;visibility:hidden;pointer-events:none}}

/* 关闭后的开屏彻底退出布局，避免作者样式覆盖浏览器的 hidden 默认规则。 */
.js .intro-screen[hidden]{display:none}

/* Header 模块：固定轻量导航，避免 blur 等移动端高开销效果。 */
.site-header{position:fixed;z-index:40;inset:0 0 auto;border-bottom:1px solid transparent;background:rgba(9,19,22,.88);transition:border-color .2s,background .2s}.site-header.is-scrolled{border-color:var(--line);background:rgba(9,19,22,.97)}.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:76px;gap:28px}.brand{display:inline-flex;align-items:center;gap:12px;flex-shrink:0}.brand-mark{display:grid;place-items:center;width:38px;height:38px;border:1px solid var(--teal);color:var(--teal);font:bold 12px Arial,sans-serif;letter-spacing:-.08em;transform:rotate(45deg)}.brand-mark span{transform:rotate(-45deg)}.brand-name{display:flex;flex-direction:column;font-size:14px;font-weight:650;line-height:1.25;letter-spacing:.05em}.brand-name small{margin-top:5px;color:var(--dim);font:8px/1 Arial,sans-serif;letter-spacing:.19em}.site-nav{display:flex;align-items:center;justify-content:flex-end;gap:28px;min-width:0;height:76px}.site-nav>a,.nav-group summary{color:#d7e2df;font-size:12px;white-space:nowrap;cursor:pointer;transition:color .2s}.site-nav>a:hover,.nav-group summary:hover{color:var(--teal)}.nav-group{position:relative;height:100%;display:grid;align-items:center}.nav-group summary{list-style:none}.nav-group summary::-webkit-details-marker{display:none}.nav-group summary::after{display:inline-block;width:5px;height:5px;margin:0 0 3px 9px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;content:"";transform:rotate(45deg);transition:transform .2s}.nav-group[open] summary::after{margin-bottom:0;transform:rotate(225deg)}.subnav{position:absolute;top:61px;left:-17px;display:grid;min-width:190px;padding:8px;border:1px solid var(--line);background:#112226;box-shadow:var(--shadow)}.subnav a{padding:9px 10px;color:var(--muted);font-size:12px;white-space:nowrap}.subnav a:hover{background:rgba(117,216,194,.1);color:var(--text)}.nav-contact{padding:10px 13px;border:1px solid rgba(117,216,194,.45);color:var(--teal)!important}.nav-contact span{margin-left:12px;font-size:16px}.nav-toggle{display:none;place-items:center;width:42px;height:42px;padding:0;border:1px solid var(--line);background:none;color:var(--text)}.nav-toggle span:not(.sr-only){display:block;width:17px;height:1px;margin:4px;background:currentColor;transition:transform .2s}.nav-toggle[aria-expanded="true"] span:nth-child(2){transform:translateY(2.5px) rotate(45deg)}.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-2.5px) rotate(-45deg)}

/* 首屏模块：CSS/SVG 动画只改变 transform 和 opacity，保持合成层友好。 */
.hero{position:relative;display:grid;align-items:center;min-height:clamp(680px,90svh,820px);overflow:hidden;background:#081316}.hero::after{position:absolute;z-index:1;inset:0;background:linear-gradient(90deg,#071114 0%,rgba(7,17,20,.92) 27%,rgba(7,17,20,.57) 51%,rgba(7,17,20,.08) 100%),linear-gradient(0deg,#091316 0%,transparent 31%,rgba(9,19,22,.34) 100%);content:""}.hero-scene{position:absolute;inset:0;opacity:.93}.hero-scene svg{width:100%;height:100%}.hall-lines{stroke:#d5efea;stroke-width:4;stroke-opacity:.15}.hall-columns{fill:none;stroke:#b5cec5;stroke-width:9;stroke-opacity:.34}.floor-lines{stroke:#b3d5cd;stroke-width:2;stroke-opacity:.12}.bridge-crane,.crane-trolley,.crane-hook{transform-box:fill-box;transform-origin:center;will-change:transform}.bridge-crane{animation:crane-travel 13s ease-in-out infinite alternate}.crane-trolley{animation:trolley-travel 8s ease-in-out infinite alternate}.crane-hook{animation:hook-lift 4.5s ease-in-out infinite}.hero-content{position:relative;z-index:2;width:var(--shell);margin:34px auto 0}.hero h1{max-width:760px;margin-bottom:20px;font-family:"Noto Serif SC","Songti SC",serif;font-size:clamp(45px,7vw,84px);font-weight:500;line-height:1.13;letter-spacing:-.06em}.hero-copy{max-width:530px;margin-bottom:0;color:#c4d3d0;font-size:14px}.hero-actions{display:flex;align-items:center;gap:26px;margin-top:32px}.hero-label{position:absolute;z-index:2;right:max(24px,calc((100vw - 1180px)/2));bottom:28px;display:flex;align-items:center;gap:8px;margin:0;padding:7px 10px;border:1px solid rgba(181,218,209,.16);background:rgba(8,19,22,.68);color:#b3c9c3;font:9px/1.4 Arial,sans-serif;letter-spacing:.1em}.hero-label i{width:6px;height:6px;border-radius:50%;background:var(--teal);box-shadow:0 0 12px var(--teal);animation:indicator 2s ease-in-out infinite}

/* 公司与文字详情模块：Grid 保持内容和图片在宽屏对齐。 */
.two-col{display:grid;grid-template-columns:minmax(0,.93fr) minmax(360px,1.07fr);gap:clamp(44px,7vw,110px);align-items:center}.about{background:radial-gradient(circle at 90% 50%,rgba(112,184,208,.09),transparent 34%)}.about p:not(.eyebrow):not(.lead){color:var(--muted);font-size:14px}.copy-disclosure{margin-top:18px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);color:var(--muted);font-size:13px}.copy-disclosure summary{padding:13px 0;color:var(--text);cursor:pointer}.copy-disclosure p{padding-bottom:13px}.stats{display:flex;flex-wrap:wrap;gap:26px;margin:28px 0 0;padding-top:20px;border-top:1px solid var(--line)}.stats div{min-width:76px}.stats dt{font-family:"Noto Serif SC","Songti SC",serif;font-size:22px}.stats dd{margin:3px 0 0;color:var(--dim);font-size:10px}.media-frame{position:relative;margin:0;padding:0 20px 20px 0}.media-frame::before{position:absolute;right:0;bottom:0;width:59%;height:52%;background:linear-gradient(135deg,var(--teal),var(--blue));content:""}.media-frame img{position:relative;width:100%;aspect-ratio:5/4;object-fit:cover;filter:saturate(.82)}.media-frame figcaption{position:absolute;z-index:1;left:19px;bottom:33px;padding:10px 13px;border-left:2px solid var(--teal);background:rgba(9,19,22,.88);font-size:11px}.media-frame figcaption small{display:block;margin-top:3px;color:var(--dim);font:8px Arial,sans-serif;letter-spacing:.12em}

/* 产品模块：卡片仅对 transform 做悬浮过渡，避免布局抖动。 */
.product-section{background:linear-gradient(180deg,#0d1a1e,#091316)}.section-head{display:flex;align-items:end;justify-content:space-between;gap:38px;margin-bottom:40px}.section-head h2{margin-bottom:0}.section-head>p{max-width:410px;margin:0 0 7px;color:var(--muted);font-size:14px}.product-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.product-card{min-height:330px;overflow:hidden;border:1px solid var(--line);background:var(--panel)}.product-card a{position:relative;display:block;height:100%}.product-card img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;filter:brightness(.71) saturate(.73);transition:transform .45s ease,filter .45s ease}.product-card a::after{position:absolute;inset:30% 0 0;background:linear-gradient(0deg,rgba(5,14,17,.97),transparent);content:""}.product-card:hover img,.product-card:focus-within img{filter:brightness(.91) saturate(.96);transform:scale(1.045)}.product-number{position:absolute;z-index:1;top:15px;right:16px;color:#dcebe8;font:9px Arial,sans-serif;letter-spacing:.13em}.product-copy{position:absolute;z-index:1;right:20px;bottom:19px;left:20px}.product-copy small{color:var(--teal);font:9px Arial,sans-serif;letter-spacing:.16em}.product-copy h3{margin:7px 0 3px;font-family:"Noto Serif SC","Songti SC",serif;font-size:22px;font-weight:500}.product-copy p{margin:0;color:#b4c4c1;font-size:11px}

/* 工艺详情与表格模块：横向滚动只出现在窄屏，不压缩单元格文字。 */
.capability{background:radial-gradient(circle at 12% 60%,rgba(117,216,194,.09),transparent 33%)}.capability-layout>div>p:not(.eyebrow){color:var(--muted);font-size:14px}.welding-frame{position:relative;margin:0;overflow:hidden;border:1px solid var(--line);background:#091316}.welding-frame img{width:100%;aspect-ratio:1.7/1;object-fit:cover;filter:saturate(.84) brightness(.76);transition:transform .45s ease,filter .45s ease}.welding-frame:hover img{filter:saturate(1) brightness(.92);transform:scale(1.025)}.welding-frame figcaption{position:absolute;right:0;bottom:0;left:0;padding:11px 14px;background:linear-gradient(0deg,rgba(5,12,15,.93),transparent);font-size:11px}.specifications{background:#0e1d21}.specifications h2{margin-bottom:10px}.section-intro{max-width:620px}.table-scroll{overflow-x:auto;margin-top:30px;border:1px solid var(--line);scrollbar-color:var(--teal) transparent}.table-scroll:focus{outline:2px solid var(--teal);outline-offset:3px}.table-scroll table{width:100%;min-width:730px;border-collapse:collapse;text-align:left}.table-scroll th,.table-scroll td{padding:18px 20px;border-bottom:1px solid var(--line);vertical-align:top;font-size:13px}.table-scroll thead th{background:#142c31;color:var(--teal);font-size:11px;letter-spacing:.1em}.table-scroll tbody th{min-width:175px;color:var(--text);font-weight:600}.table-scroll td{color:var(--muted)}.table-scroll tbody tr:last-child>*{border-bottom:0}

/* 现场、设备与资质模块：图片均为 lazy WebP 且带固有尺寸。 */
.workshop{background:linear-gradient(180deg,#091316,#0f2024)}.workshop-grid{display:grid;grid-template-columns:1.35fr .65fr .65fr;gap:14px}.workshop-card{position:relative;min-height:275px;margin:0;overflow:hidden;border:1px solid var(--line);background:var(--panel)}.workshop-card img{width:100%;height:100%;object-fit:cover;filter:saturate(.75) brightness(.75);transition:transform .45s ease,filter .45s ease}.workshop-card:hover img{filter:saturate(.97) brightness(.93);transform:scale(1.04)}.workshop-card figcaption{position:absolute;right:0;bottom:0;left:0;display:flex;justify-content:space-between;gap:12px;padding:14px;background:linear-gradient(0deg,rgba(3,10,12,.94),transparent);font-size:11px}.workshop-card figcaption small{color:var(--teal);font:9px Arial,sans-serif;letter-spacing:.1em}.equipment-layout{display:grid;grid-template-columns:.85fr 1.15fr;align-items:center;min-height:440px;overflow:hidden;border:1px solid var(--line);background:radial-gradient(circle at 77% 45%,#274a4d 0%,#12262a 36%,#0d1a1e 75%)}.equipment-layout>div{padding:52px 0 52px 52px}.equipment-layout>div p:not(.eyebrow){max-width:430px;color:var(--muted);font-size:14px}.equipment-stage{position:relative;display:grid;min-height:400px;margin:0;place-items:center;overflow:hidden}.equipment-stage::before{position:absolute;width:min(32vw,370px);aspect-ratio:1;border:1px solid rgba(199,235,223,.2);border-radius:50%;box-shadow:0 0 0 42px rgba(199,235,223,.04),0 0 0 84px rgba(199,235,223,.025);content:""}.equipment-stage img{position:relative;z-index:1;width:min(82%,500px);max-height:390px;object-fit:contain;filter:drop-shadow(0 20px 25px rgba(0,0,0,.45));animation:equipment-float 7s ease-in-out infinite}.equipment-stage figcaption{position:absolute;z-index:2;right:7%;bottom:9%;padding:7px 9px;border-left:1px solid var(--teal);background:rgba(8,17,20,.86);color:#d3e3de;font:8px Arial,sans-serif;letter-spacing:.12em}.credentials{background:radial-gradient(circle at 14% 50%,rgba(112,184,208,.1),transparent 31%)}.credential-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.credential-card{overflow:hidden;padding:0;border:1px solid var(--line);background:var(--panel);color:var(--text);text-align:left;cursor:zoom-in}.credential-card img{width:100%;aspect-ratio:1.6/1;object-fit:cover;transition:transform .35s ease}.credential-card:hover img{transform:scale(1.025)}.credential-card span{display:block;padding:12px;font-size:12px}.credential-card small{display:block;margin-top:3px;color:var(--dim);font:8px Arial,sans-serif;letter-spacing:.1em}

/* 联系模块：信息采用 address，便于移动端直接拨号。 */
.contact{padding:104px 0;background:#071214}.contact-layout{display:grid;grid-template-columns:1fr 1fr;gap:clamp(40px,9vw,150px);align-items:center}.contact h2{font-size:clamp(35px,4.4vw,58px)}.contact p:not(.eyebrow){color:var(--muted);font-size:14px}.contact-list{margin:0;font-style:normal}.contact-list p{display:grid;grid-template-columns:94px 1fr;gap:18px;margin:0;padding:15px 0;border-bottom:1px solid var(--line);font-size:13px}.contact-list span{color:var(--dim);font-size:10px}.contact-list b{font-weight:500}.contact-list a{color:var(--teal);font-size:18px}.site-footer{border-top:1px solid var(--line);background:#071214}.site-footer>div{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:80px;color:var(--muted);font-size:11px}.site-footer b{color:var(--text);font-weight:500}.site-footer a{color:var(--teal)}

/* 交互模块：小脚本只负责导航、弹窗和可选音乐。 */
.image-dialog{width:min(90vw,840px);padding:0;border:1px solid var(--line);background:#0b171a;color:var(--text);box-shadow:var(--shadow)}.image-dialog::backdrop{background:rgba(0,0,0,.76)}.image-dialog p{margin:0;padding:12px 48px 12px 15px;font-size:12px}.image-dialog img{width:100%;max-height:78vh;object-fit:contain;background:#071214}.dialog-close{position:absolute;z-index:1;top:8px;right:8px;width:32px;height:32px;border:0;border-radius:50%;background:#182d31;color:var(--text);font-size:22px;cursor:pointer}.music-toggle{position:fixed;z-index:20;right:18px;bottom:18px;display:flex;align-items:center;gap:8px;padding:10px 12px;border:1px solid var(--line);background:rgba(11,27,31,.93);color:#c7d7d3;font-size:11px;cursor:pointer;box-shadow:var(--shadow)}.music-toggle[aria-pressed="true"]{border-color:var(--teal);color:var(--teal)}.music-toggle[aria-pressed="true"]>span:first-child{animation:indicator 1.5s ease-in-out infinite}.js [data-reveal]{opacity:0;transform:translate3d(0,18px,0);transition:opacity .55s ease,transform .55s cubic-bezier(.2,.8,.2,1)}.js [data-reveal].is-visible{opacity:1;transform:none}

@keyframes crane-travel{from{transform:translate3d(-14px,0,0)}to{transform:translate3d(29px,0,0)}}@keyframes trolley-travel{from{transform:translate3d(-28px,0,0)}to{transform:translate3d(46px,0,0)}}@keyframes hook-lift{0%,100%{transform:translate3d(0,2px,0)}50%{transform:translate3d(0,-13px,0)}}@keyframes indicator{0%,100%{opacity:.55}50%{opacity:1;box-shadow:0 0 15px var(--teal)}}@keyframes equipment-float{0%,100%{transform:translate3d(0,0,0) rotate(-.35deg)}50%{transform:translate3d(0,-11px,0) rotate(.35deg)}}

/* 平板 768px/1024px：收窄网格且提前折叠导航，避免挤压。 */
@media (max-width:1024px){.site-nav{gap:19px}.header-inner{gap:15px}.brand-name{font-size:12px}.product-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.product-card:last-child{grid-column:span 2}.workshop-grid{grid-template-columns:1fr 1fr}.workshop-card-large{grid-column:span 2}.equipment-layout>div{padding-left:34px}.two-col{gap:42px}}
@media (max-width:768px){:root{--shell:min(100% - 40px,620px)}html{scroll-padding-top:68px}.section,.contact{padding:72px 0}.site-header{background:rgba(9,19,22,.96)}.header-inner{min-height:66px}.brand-mark{width:31px;height:31px;font-size:10px}.brand-name{font-size:11px}.brand-name small{font-size:6px}.nav-toggle{display:grid}.site-nav{position:absolute;top:66px;right:0;left:0;height:auto;max-height:calc(100svh - 66px);padding:8px 20px 20px;overflow:auto;border-bottom:1px solid var(--line);background:#0a181c}.js .site-nav{display:none}.js .site-nav.is-open{display:grid}.site-nav>a,.nav-group{height:auto;padding:12px 0;border-bottom:1px solid var(--line)}.nav-contact{margin-top:8px;text-align:center}.nav-group summary{display:block}.subnav{position:static;min-width:0;margin:8px 0 0;padding:3px 0 3px 13px;border:0;border-left:1px solid var(--line);box-shadow:none;background:transparent}.subnav a{padding:8px 0}.hero{min-height:max(630px,100svh)}.hero-scene{transform:translateX(14%) scale(1.12);transform-origin:center right;opacity:.72}.hero::after{background:linear-gradient(90deg,#071114f2 0%,#071114c9 54%,rgba(7,17,20,.3) 100%),linear-gradient(0deg,#091316 0%,transparent 28%,rgba(9,19,22,.42) 100%)}.hero h1{font-size:clamp(43px,11vw,65px)}.hero-copy{max-width:390px;font-size:13px}.hero-actions{gap:18px}.hero-label{display:none}.two-col,.contact-layout{grid-template-columns:1fr}.about-layout{gap:30px}.media-frame{max-width:580px}.section-head{display:block;margin-bottom:30px}.section-head>p{margin-top:14px}.product-card{min-height:285px}.equipment-layout{grid-template-columns:1fr}.equipment-layout>div{padding:35px 25px 4px}.equipment-stage{min-height:320px}.equipment-stage::before{width:235px}.equipment-stage img{max-height:292px}.credential-grid{max-width:570px}.contact-list{max-width:650px}.site-footer>div{align-items:flex-start;flex-direction:column;justify-content:center;padding:16px 0}.music-toggle{right:13px;bottom:13px}.section-deferred{contain-intrinsic-size:auto 760px}}

/* 开屏在手机上保持可读的品牌信息与足够大的跳过入口。 */
@media (max-width:768px){.intro-inner{width:min(100% - 36px,660px)}.intro-topline{font-size:8px;letter-spacing:.13em}.intro-topline span:last-child{max-width:200px;text-align:right}.intro-scene{margin-top:clamp(38px,9vh,72px)}.intro-copy-wrap{margin-top:-1px}.intro-copy{max-width:330px;font-size:12px}.intro-skip{top:16px;right:18px}}

/* 375px：单列产品卡片、可读字号和更宽的触控区域。 */
@media (max-width:480px){:root{--shell:calc(100% - 32px)}.brand-name{max-width:190px}.hero-content{margin-top:20px}.hero h1{font-size:43px}.hero-actions{align-items:flex-start;flex-direction:column;gap:17px}.product-grid{grid-template-columns:1fr}.product-card,.product-card:last-child{grid-column:auto;min-height:300px}.workshop-grid{grid-template-columns:1fr}.workshop-card-large{grid-column:auto}.workshop-card{min-height:220px}.stats{gap:18px}.table-scroll{margin-inline:-1px}.table-scroll th,.table-scroll td{padding:15px;font-size:12px}.credential-grid{gap:9px}.contact-list p{grid-template-columns:1fr;gap:4px}.contact-list a{font-size:17px}.music-toggle>span:last-child{display:none}.music-toggle{width:42px;height:42px;justify-content:center;padding:0}.equipment-stage figcaption{right:4%;bottom:5%;font-size:7px}}

/* 无障碍：用户选择减少动态时关闭所有非必要动画和揭示过渡。 */
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.bridge-crane,.crane-trolley,.crane-hook,.hero-label i,.equipment-stage img,.music-toggle[aria-pressed="true"]>span:first-child{animation:none!important}.js [data-reveal]{opacity:1;transform:none;transition:none}.product-card img,.welding-frame img,.workshop-card img,.credential-card img{transition:none}}

/* 减少动态时由脚本立即略过开屏；这里同时撤销所有残留动画。 */
@media (prefers-reduced-motion:reduce){.js .intro-screen{display:none!important}.intro-screen,.intro-screen *{animation:none!important;transition:none!important}}