/* 像一本工厂产品目录：浅锌灰底，产品照放在白色格子里，型号用等宽字；小标题前带一条有刻度的尺寸线。系统字体，俄语、中国、中亚都秒开 */
:root{
 --paper:#f3f4f2;--sheet:#ffffff;--photo:#f7f8f7;--ink:#1b2023;--muted:#59636a;--rule:#d5dadb;
 --steel:#1f5f7f;--steel-soft:#e0ebf1;--wa:#177a47;--wa-ink:#ffffff;
 --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,"Noto Sans",sans-serif;
 --mono:ui-monospace,"SF Mono","Cascadia Mono","Roboto Mono",Menlo,Consolas,monospace;
 --r:6px;--gap:clamp(16px,2.4vw,28px)
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--paper:#111416;--sheet:#181c1f;--photo:#eef0ef;--ink:#e6eaec;--muted:#9aa4aa;--rule:#2b3236;--steel:#86bcd9;--steel-soft:#1b2c36;--wa:#2a9d5f;--wa-ink:#ffffff;color-scheme:dark}}
:root[data-theme="dark"]{--paper:#111416;--sheet:#181c1f;--photo:#eef0ef;--ink:#e6eaec;--muted:#9aa4aa;--rule:#2b3236;--steel:#86bcd9;--steel-soft:#1b2c36;--wa:#2a9d5f;--wa-ink:#ffffff;color-scheme:dark}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:80px}
body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 var(--sans)}
img{max-width:100%;height:auto;display:block}
a{color:var(--steel)}
h1,h2,h3{line-height:1.2;text-wrap:balance;margin:0}
p{margin:0}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums;letter-spacing:.01em}
.muted{color:var(--muted)}.small{font-size:.88rem}
.wrap{max-width:1200px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.narrow{max-width:760px}
.skip{position:absolute;left:-999px;top:0}.skip:focus{left:16px;top:8px;z-index:30;background:var(--sheet);padding:6px 12px}
:focus-visible{outline:2px solid var(--steel);outline-offset:2px}

/* 顶栏 */
.top{position:sticky;top:0;z-index:20;background:var(--sheet);border-bottom:1px solid var(--rule);padding-top:env(safe-area-inset-top,0px)}
.top-in{display:flex;flex-wrap:wrap;align-items:center;gap:8px 24px;padding-block:10px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink)}
.mark{font-weight:800;letter-spacing:.06em;font-size:1.05rem;border:2px solid var(--ink);padding:1px 7px;border-radius:3px}
.brand-sub{font-size:.85rem;color:var(--muted)}
.nav{display:flex;flex-wrap:wrap;gap:4px 18px;flex:1 1 auto}
.nav a{color:var(--ink);text-decoration:none;font-size:.95rem}.nav a:hover{color:var(--steel)}
.top-act{display:flex;align-items:center;gap:12px}
.lang{font-size:.9rem;color:var(--muted);text-decoration:none;border-bottom:1px dotted currentColor}
@media (max-width:720px){.nav{order:3;flex-basis:100%;gap:4px 16px}.brand-sub{display:none}.top-act .btn-wa{padding:6px 12px;font-size:.85rem}}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font:inherit;font-size:.95rem;font-weight:600;text-decoration:none;border-radius:999px;padding:8px 18px;cursor:pointer;border:1px solid transparent;line-height:1.3}
.btn-wa{background:var(--wa);color:var(--wa-ink)}.btn-wa:hover{filter:brightness(1.08)}
.btn-line{background:transparent;color:var(--ink);border-color:var(--ink)}.btn-line:hover{background:var(--sheet)}
.btn-lg{padding:12px 22px;font-size:1rem}
.linkbtn{font:inherit;background:none;border:0;padding:0;color:var(--steel);cursor:pointer;text-decoration:underline}
.cta{display:flex;flex-wrap:wrap;gap:10px}
.more{font-size:.92rem;text-decoration:none;white-space:nowrap}

/* 小标题前的尺寸线 */
.dim{display:flex;align-items:center;gap:14px;font-size:clamp(1.35rem,2.4vw,1.75rem)}
.dim::before{content:"";flex:0 0 44px;height:9px;border-left:1px solid var(--muted);border-right:1px solid var(--muted);background:linear-gradient(var(--muted),var(--muted)) center/100% 1px no-repeat}
.eyebrow{font-size:.82rem;color:var(--muted);letter-spacing:.06em;text-transform:uppercase}

/* 首页 */
.hero{background:var(--sheet);border-bottom:1px solid var(--rule)}
.hero-in{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:var(--gap);align-items:center;padding-block:clamp(28px,5vw,64px) 28px}
.hero-text{display:grid;gap:18px;align-content:start}
.hero h1{font-size:clamp(1.9rem,4.2vw,3.1rem);letter-spacing:-.01em;max-width:16em}
.lead{font-size:1.07rem;color:var(--muted);max-width:36em}
.mosaic{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.m-tile{background:var(--photo);border:1px solid var(--rule);border-radius:var(--r);aspect-ratio:1;display:grid;place-items:center;padding:8%;overflow:hidden}
.m-tile img{max-height:100%;object-fit:contain;transition:transform .3s}
.m-tile:hover img{transform:scale(1.04)}
.facts{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:1px solid var(--rule)}
.fact{display:grid;gap:2px;padding:16px 18px 20px 0}
.fact+.fact{padding-left:18px;border-left:1px solid var(--rule)}
.fact b{font-size:1.25rem}.fact span{font-size:.88rem;color:var(--muted)}
@media (max-width:860px){.hero-in{grid-template-columns:minmax(0,1fr)}.facts{grid-template-columns:repeat(2,minmax(0,1fr))}.fact:nth-child(3){border-left:0;padding-left:0}.fact:nth-child(n+3){border-top:1px solid var(--rule)}}

.sec{padding-block:clamp(32px,5vw,64px)}
.sec-alt{background:var(--sheet);border-block:1px solid var(--rule)}
.sec>.wrap{display:grid;gap:22px}
.cgrid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
@media (max-width:860px){.cgrid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:520px){.cgrid{grid-template-columns:minmax(0,1fr)}}
.ccard{display:grid;grid-template-rows:auto 1fr;background:var(--sheet);border:1px solid var(--rule);border-radius:var(--r);text-decoration:none;color:var(--ink);overflow:hidden}
.ccard:hover{border-color:var(--steel)}
.ccard .ph{aspect-ratio:16/9;padding:14px 20%}
.cc-body{display:grid;gap:4px;padding:14px 16px 16px;align-content:start}
.cc-h{font-weight:700;font-size:1.05rem}.cc-n{font-size:.8rem;color:var(--muted)}.cc-p{font-size:.9rem;color:var(--muted)}
.ph{display:grid;place-items:center;background:var(--photo);overflow:hidden}
.ph img{max-height:100%;width:auto;object-fit:contain}

.ruler-in{grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);align-items:center;gap:var(--gap)}
.ruler-in>div{display:grid;gap:12px}
.ruler{width:100%;height:auto;overflow:visible}
.r-base{stroke:var(--ink);stroke-width:1.5}.r-tick{stroke:var(--muted);stroke-width:1}
.r-num{fill:var(--muted);font:12px var(--mono);text-anchor:middle}
.r-dot{fill:var(--steel)}.r-lab{fill:var(--ink);font:600 14px var(--mono);text-anchor:middle}
.r-door{fill:var(--steel-soft);stroke:var(--steel)}.r-note{fill:var(--muted);font:12px var(--sans);text-anchor:middle}
.r-unit{fill:var(--muted);font:12px var(--mono);text-anchor:end}.r-note-end{text-anchor:end}
@media (max-width:860px){.ruler-in{grid-template-columns:minmax(0,1fr)}}

.two{grid-template-columns:minmax(0,1fr) minmax(0,1.2fr);gap:var(--gap)!important;align-items:start}
.two>div{display:grid;gap:14px}
@media (max-width:860px){.two{grid-template-columns:minmax(0,1fr)}}
.steps{list-style:none;margin:0;padding:0;display:grid;gap:0;border-top:1px solid var(--rule)}
.steps li{display:grid;grid-template-columns:3em minmax(0,1fr);gap:2px 12px;padding:14px 0;border-bottom:1px solid var(--rule)}
.steps li b{grid-column:2}.steps li span:last-child{grid-column:2;color:var(--muted);font-size:.93rem}
.step-n{grid-row:1/3;color:var(--steel);font-size:.95rem;padding-top:1px}
.steps-row{grid-template-columns:repeat(5,minmax(0,1fr));border-top:0;gap:12px}
.steps-row li{grid-template-columns:minmax(0,1fr);border:0;border-top:2px solid var(--ink);padding:12px 0 0;align-content:start}
.steps-row li b,.steps-row li span:last-child{grid-column:1}.steps-row .step-n{grid-row:auto;font-size:1.4rem}
@media (max-width:860px){.steps-row{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:520px){.steps-row{grid-template-columns:minmax(0,1fr)}}
.note{color:var(--muted);font-size:.93rem}

/* 产品列表 */
.pt{font-size:clamp(1.7rem,3.4vw,2.4rem)}
.pt-p{color:var(--muted);max-width:44em}
.crumb{font-size:.88rem;color:var(--muted)}.crumb a{color:var(--muted)}
.catnav{display:flex;flex-wrap:wrap;gap:8px}
.catnav a{font-size:.9rem;text-decoration:none;color:var(--ink);border:1px solid var(--rule);background:var(--sheet);border-radius:999px;padding:4px 14px}
.catnav a[aria-current=page]{border-color:var(--steel);background:var(--steel-soft);color:var(--ink)}
.psec{display:grid;gap:14px;padding-top:14px}
.psec-h{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 14px}.psec-h h2{font-size:1.3rem}.psec-h .more{margin-left:auto}
.pgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,190px),1fr));gap:12px}
.pcard{display:grid;grid-template-rows:auto auto 1fr;gap:4px;background:var(--sheet);border:1px solid var(--rule);border-radius:var(--r);padding:8px 8px 12px;text-decoration:none;color:var(--ink);min-width:0}
.pcard:hover{border-color:var(--steel)}
.pcard .ph{aspect-ratio:4/3;border-radius:4px;padding:8px}
.pc-code{font-size:.75rem;color:var(--muted);display:flex;flex-wrap:wrap;gap:4px 8px;align-items:center;margin-top:6px}
.pc-name{font-size:.92rem;line-height:1.35}
.tag{font-size:.7rem;color:var(--steel);border:1px solid currentColor;border-radius:3px;padding:0 4px}

/* 产品页 */
.prod{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:var(--gap);align-items:start}
@media (max-width:860px){.prod{grid-template-columns:minmax(0,1fr)}}
.gal{display:grid;gap:10px}
.gal-main{background:var(--photo);border:1px solid var(--rule);border-radius:var(--r);aspect-ratio:4/3;display:grid;place-items:center;padding:4%;overflow:hidden}
.gal-main img{max-height:100%;width:auto;object-fit:contain}
.thumbs{display:flex;flex-wrap:wrap;gap:8px}
.thumb{width:72px;aspect-ratio:1;padding:4px;background:var(--photo);border:1px solid var(--rule);border-radius:4px;cursor:pointer;display:grid;place-items:center}
.thumb img{max-height:100%;object-fit:contain}
.thumb[aria-current=true]{border-color:var(--steel);box-shadow:0 0 0 1px var(--steel)}
.pinfo{display:grid;gap:16px;align-content:start}
.pinfo h1{font-size:clamp(1.5rem,2.8vw,2.1rem)}
.pcode{font-size:.85rem;color:var(--steel)}
.spec{display:grid;grid-template-columns:minmax(7em,auto) minmax(0,1fr);margin:0;border-top:1px solid var(--rule)}
.spec dt,.spec dd{padding:9px 0;border-bottom:1px solid var(--rule);margin:0}
.spec dt{color:var(--muted);font-size:.9rem;padding-right:16px}
.spec dd{font-size:.95rem}
.ask{display:grid;gap:12px;background:var(--sheet);border:1px solid var(--rule);border-radius:var(--r);padding:16px}
.ask h2{font-size:1.05rem}

/* 联系 */
.contact{padding-block:clamp(32px,5vw,56px);background:var(--ink);color:var(--paper)}
.contact .wrap{display:grid;gap:20px}
.contact h2{font-size:clamp(1.4rem,2.6vw,1.9rem)}
.contact-head{display:grid;gap:6px}.contact-head p{color:color-mix(in srgb,var(--paper) 75%,transparent)}
.ways{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1px;background:color-mix(in srgb,var(--paper) 18%,transparent);border:1px solid color-mix(in srgb,var(--paper) 18%,transparent);border-radius:var(--r);overflow:hidden}
.way{display:grid;gap:6px;align-content:start;padding:16px;background:var(--ink)}
.way-k{font-size:.8rem;letter-spacing:.06em;text-transform:uppercase;color:color-mix(in srgb,var(--paper) 65%,transparent)}
.way-v{font-size:1.05rem;overflow-wrap:anywhere;user-select:all}
.way-act{margin-top:4px}
.contact .btn-line{color:var(--paper);border-color:var(--paper)}.contact .btn-line:hover{background:color-mix(in srgb,var(--paper) 12%,transparent)}
@media (max-width:860px){.ways{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:480px){.ways{grid-template-columns:minmax(0,1fr)}}
.form{display:grid;gap:8px;background:var(--sheet);border:1px solid var(--rule);border-radius:var(--r);padding:20px}
.form h2{font-size:1.15rem;margin-bottom:4px}
.form label{font-size:.88rem;color:var(--muted);margin-top:6px}
.form input,.form textarea{font:inherit;width:100%;padding:9px 11px;border:1px solid var(--rule);border-radius:4px;background:var(--paper);color:var(--ink)}
.form-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.form .cta{margin-top:10px}
@media (max-width:520px){.form-2{grid-template-columns:minmax(0,1fr)}}
.foot{background:var(--ink);color:color-mix(in srgb,var(--paper) 60%,transparent);border-top:1px solid color-mix(in srgb,var(--paper) 14%,transparent);padding-bottom:env(safe-area-inset-bottom,0px)}
.foot-in{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;padding-block:14px;font-size:.85rem}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}