/* ============================================================
   SHSUOQI.COM — Engineering Copper design system
   深咖黑 × 铜橙 × 制图网格 · Chakra Petch + Manrope + 系统中文栈
   ============================================================ */
@font-face{font-family:'Chakra Petch';font-style:normal;font-weight:500;font-display:swap;src:url('../fonts/chakra-petch-500.woff2') format('woff2')}
@font-face{font-family:'Chakra Petch';font-style:normal;font-weight:700;font-display:swap;src:url('../fonts/chakra-petch-700.woff2') format('woff2')}
@font-face{font-family:'Manrope';font-style:normal;font-weight:400;font-display:swap;src:url('../fonts/manrope-400.woff2') format('woff2')}
@font-face{font-family:'Manrope';font-style:normal;font-weight:700;font-display:swap;src:url('../fonts/manrope-700.woff2') format('woff2')}

:root{
  --ink:#17120E; --ink-2:#211A14; --ink-3:#2A211A;
  --paper:#F7F3EC; --paper-2:#EFE8DC;
  --copper:#C46A2B; --copper-hi:#E59255; --copper-deep:#8F4517;
  --text-d:#241C14; --text-l:#EFE7DB;
  --muted-d:#6E6258; --muted-l:#A79786;
  --line-d:#352B22; --line-l:#DDD2C2;
  --fd:'Chakra Petch','PingFang SC','Microsoft YaHei',sans-serif;
  --fb:'Manrope','PingFang SC','Microsoft YaHei','Noto Sans SC',sans-serif;
  --fm:ui-monospace,'Cascadia Mono',Consolas,'Courier New',monospace;
  --w:min(1180px,92vw);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--fb);color:var(--text-d);background:var(--paper-2);line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{width:var(--w);margin:0 auto}
.mono{font-family:var(--fm)}

/* ---------- topbar ---------- */
.topbar{background:#F3EDE2;color:var(--muted-d);font-family:var(--fm);font-size:.82rem;letter-spacing:.03em;border-bottom:1px solid var(--line-l)}
.topbar .wrap{display:flex;justify-content:space-between;gap:1rem;padding:.5rem 0}
.topbar a{color:var(--copper-deep);font-weight:700}
.topbar .tb-tags span{margin-right:1.2rem}
@media(max-width:720px){.topbar .tb-contact{display:none}}

/* ---------- header ---------- */
.site-head{position:sticky;top:0;z-index:50;background:rgba(247,243,236,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line-l);transition:box-shadow .3s}
.site-head.scrolled{box-shadow:0 8px 30px rgba(23,18,14,.1)}
.site-head .wrap{display:flex;align-items:center;justify-content:space-between;padding:.8rem 0}
.brand{display:flex;align-items:center;gap:.65rem;color:var(--text-d)}
.brand svg{width:38px;height:38px;flex:none}
.brand .b-name{font-family:var(--fd);font-weight:700;font-size:1.12rem;letter-spacing:.06em;line-height:1.1}
.brand .b-sub{display:block;font-family:var(--fm);font-size:.62rem;color:var(--muted-d);letter-spacing:.28em;font-weight:400}
.nav{display:flex;align-items:center;gap:2rem}
.nav a{color:var(--text-d);font-family:var(--fd);font-weight:500;font-size:.92rem;letter-spacing:.08em;padding:.4rem 0;position:relative}
.nav a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--copper);transition:width .25s}
.nav a:hover::after,.nav a.on::after{width:100%}
.nav a.on{color:var(--copper-deep)}
.lang-sw{font-family:var(--fm);font-size:.8rem;border:1px solid var(--line-l);padding:.35rem .8rem;border-radius:2px;transition:.25s;color:var(--text-d)}
.lang-sw:hover{border-color:var(--copper);color:var(--copper-deep)}
.lang-sw b{color:var(--copper-deep);font-weight:700}
.burger{display:none;background:none;border:1px solid var(--line-l);color:var(--text-d);padding:.4rem .6rem;font-size:1rem;cursor:pointer;border-radius:2px}
@media(max-width:880px){
  .burger{display:block}
  .nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--paper);flex-direction:column;align-items:flex-start;gap:0;padding:.6rem 4vw 1rem;border-bottom:2px solid var(--copper)}
  .nav.open{display:flex}
  .nav a{width:100%;padding:.7rem 0;border-bottom:1px solid var(--line-l)}
  .nav a::after{display:none}
}

/* ---------- hero ---------- */
.hero{position:relative;background:var(--paper);color:var(--text-d);overflow:hidden;border-bottom:1px solid var(--line-l)}
.hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(var(--line-l) 1px,transparent 1px),linear-gradient(90deg,var(--line-l) 1px,transparent 1px);background-size:56px 56px;opacity:.55}
.hero::after{content:"";position:absolute;right:-180px;top:-140px;width:640px;height:640px;background:radial-gradient(circle,rgba(196,106,43,.16),transparent 62%)}
.hero .wrap{position:relative;z-index:2;padding:5.5rem 0 4.2rem}
.kicker{font-family:var(--fm);font-size:.78rem;letter-spacing:.34em;color:var(--copper-deep);text-transform:uppercase;display:inline-flex;align-items:center;gap:.7rem}
.kicker::before{content:"";width:34px;height:1px;background:var(--copper)}
.hero h1{font-family:var(--fd);font-weight:700;font-size:clamp(2.1rem,4.6vw,3.6rem);line-height:1.16;margin:1.1rem 0 1rem;letter-spacing:.01em}
.hero h1 em{font-style:normal;color:var(--copper-deep)}
.hero .lead{max-width:640px;color:var(--muted-d);font-size:1.02rem}
.hero-cta{display:flex;gap:.9rem;margin-top:2rem;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:.55rem;font-family:var(--fd);font-weight:700;font-size:.92rem;letter-spacing:.06em;padding:.85rem 1.7rem;border-radius:2px;transition:.25s;border:1px solid transparent}
.btn-cu{background:var(--copper);color:#fff}
.btn-cu:hover{background:var(--copper-hi);transform:translateY(-2px);box-shadow:0 10px 26px rgba(196,106,43,.35)}
.btn-gh{border-color:var(--line-l);color:var(--text-d);background:#fff}
.btn-gh:hover{border-color:var(--copper);color:var(--copper-deep)}
/* spec strip */
.spec-strip{position:relative;z-index:2;border-top:1px solid var(--line-l);background:#F3EDE2}
.spec-strip .wrap{display:grid;grid-template-columns:repeat(4,1fr);}
.spec-strip .sp{padding:1.05rem .4rem 1rem;text-align:center;border-left:1px solid var(--line-l)}
.spec-strip .sp:first-child{border-left:none}
.spec-strip .sp b{display:block;font-family:var(--fd);font-size:1.25rem;color:var(--copper-deep);letter-spacing:.03em}
.spec-strip .sp span{font-family:var(--fm);font-size:.68rem;letter-spacing:.14em;color:var(--muted-d);text-transform:uppercase}
@media(max-width:720px){.spec-strip .wrap{grid-template-columns:repeat(2,1fr)}.spec-strip .sp:nth-child(3){border-left:none}}

/* ---------- section scaffolding ---------- */
.sec{padding:4.6rem 0;background:var(--paper)}
.sec.alt{background:var(--paper-2)}
.sec.dark{background:var(--paper-2);color:var(--text-d)}
.sec-head{display:flex;align-items:baseline;gap:1.1rem;margin-bottom:2.6rem;flex-wrap:wrap}
.sec-no{font-family:var(--fm);font-size:.82rem;color:var(--copper-deep);letter-spacing:.2em;border:1px solid currentColor;padding:.28rem .7rem;border-radius:2px}
.sec-head h2{font-family:var(--fd);font-weight:700;font-size:clamp(1.55rem,2.9vw,2.2rem);letter-spacing:.02em}
.sec-head .more{margin-left:auto;font-family:var(--fm);font-size:.8rem;letter-spacing:.12em;color:var(--copper-deep);border-bottom:1px solid transparent;transition:.25s}
.sec-head .more:hover{border-color:var(--copper-deep)}
.sec.dark .sec-head h2{color:var(--text-d)}
.sec .sub{max-width:720px;color:var(--muted-d);margin:-1.6rem 0 2.4rem}
.sec.dark .sub{color:var(--muted-d)}

/* reveal: CSS-only entrance animation — plays once on load, no JS dependency */
.rv{animation:fadeUp .7s ease both}
@keyframes fadeUp{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:none}}
@media (prefers-reduced-motion: reduce){.rv{animation:none}}

/* ---------- product cards ---------- */
.pgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.4rem}
@media(max-width:980px){.pgrid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.pgrid{grid-template-columns:1fr}}
.pcard{background:#fff;border:1px solid var(--line-l);border-radius:3px;overflow:hidden;transition:.3s;display:flex;flex-direction:column;position:relative}
.pcard::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--copper);transform:scaleX(0);transform-origin:left;transition:transform .35s}
.pcard:hover{transform:translateY(-6px);box-shadow:0 22px 44px rgba(23,18,14,.14);border-color:var(--copper)}
.pcard:hover::before{transform:scaleX(1)}
.pcard .ph{aspect-ratio:4/3;overflow:hidden;background:var(--paper-2);position:relative}
.pcard .ph img{width:100%;height:100%;object-fit:cover;transition:transform .6s}
.pcard:hover .ph img{transform:scale(1.05)}
.pcard .ph.gfx{display:flex;align-items:center;justify-content:center;background:radial-gradient(circle at 30% 20%,#FDFBF7,#F3E9DC 70%)}
.pcard .ph.gfx svg{width:56%;opacity:.92}
.pcard .ph.gfx svg *{stroke:#9A4E1C}
.pcard .ph.gfx svg [fill="#E59255"]{fill:#C46A2B;stroke:none}
.pcard .pb{padding:1.15rem 1.25rem 1.3rem;flex:1;display:flex;flex-direction:column}
.pcard .code{font-family:var(--fm);font-size:.68rem;letter-spacing:.2em;color:var(--copper)}
.pcard h3{font-family:var(--fd);font-weight:700;font-size:1.08rem;margin:.4rem 0 .45rem}
.pcard p{font-size:.88rem;color:var(--muted-d);flex:1}
.pcard .specs{margin-top:.9rem;padding-top:.75rem;border-top:1px dashed var(--line-l);font-family:var(--fm);font-size:.72rem;color:var(--muted-d);display:flex;flex-direction:column;gap:.24rem}
.pcard .specs i{color:var(--copper);font-style:normal;margin-right:.45rem}

/* ---------- feature tri ---------- */
.tri{display:grid;grid-template-columns:repeat(3,1fr);gap:1.4rem}
@media(max-width:900px){.tri{grid-template-columns:1fr}}
.tri .t{background:#fff;border:1px solid var(--line-l);border-radius:3px;padding:1.7rem 1.6rem;transition:.3s;position:relative;box-shadow:0 4px 14px rgba(23,18,14,.04)}
.tri .t:hover{border-color:var(--copper);transform:translateY(-4px);box-shadow:0 18px 36px rgba(23,18,14,.1)}
.tri .t .no{font-family:var(--fm);font-size:.72rem;color:var(--copper-deep);letter-spacing:.2em}
.tri .t h3{font-family:var(--fd);font-size:1.12rem;margin:.6rem 0 .5rem;color:var(--text-d)}
.tri .t p{font-size:.88rem;color:var(--muted-d)}
.tri .t::after{content:"";position:absolute;right:0;bottom:0;width:52px;height:52px;background:linear-gradient(135deg,transparent 50%,rgba(196,106,43,.12) 50%)}

/* ---------- process steps ---------- */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:1.2rem;counter-reset:st}
@media(max-width:900px){.steps{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.steps{grid-template-columns:1fr}}
.step{border:1px solid var(--line-l);border-radius:3px;padding:1.5rem 1.3rem;background:#fff;position:relative}
.step::before{counter-increment:st;content:"0" counter(st);font-family:var(--fm);font-size:2rem;font-weight:700;color:transparent;-webkit-text-stroke:1.2px var(--copper);display:block;line-height:1}
.step h4{font-family:var(--fd);font-size:1rem;margin:.8rem 0 .4rem}
.step p{font-size:.84rem;color:var(--muted-d)}

/* ---------- CTA band ---------- */
.cta-band{background:linear-gradient(120deg,var(--copper-deep),var(--copper) 55%,#D97F3A);color:#fff;position:relative;overflow:hidden}
.cta-band::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.07) 1px,transparent 1px);background-size:44px 44px}
.cta-band .wrap{position:relative;padding:3.4rem 0;display:flex;align-items:center;justify-content:space-between;gap:1.6rem;flex-wrap:wrap}
.cta-band h2{font-family:var(--fd);font-size:clamp(1.4rem,2.6vw,2rem);letter-spacing:.02em}
.cta-band p{opacity:.92;font-size:.95rem;margin-top:.3rem}
.cta-band .btn{background:var(--ink);color:var(--text-l)}
.cta-band .btn:hover{background:#000;transform:translateY(-2px)}

/* ---------- page hero (subpages) ---------- */
.phero{background:var(--paper);color:var(--text-d);position:relative;overflow:hidden;border-bottom:1px solid var(--line-l)}
.phero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(var(--line-l) 1px,transparent 1px),linear-gradient(90deg,var(--line-l) 1px,transparent 1px);background-size:56px 56px;opacity:.5}
.phero .wrap{position:relative;padding:4.2rem 0 3.2rem}
.phero .crumbs{font-family:var(--fm);font-size:.72rem;letter-spacing:.14em;color:var(--muted-d);margin-bottom:1.1rem;text-transform:uppercase}
.phero .crumbs a{color:var(--copper-deep)}
.phero h1{font-family:var(--fd);font-weight:700;font-size:clamp(1.8rem,3.6vw,2.7rem)}
.phero .lead{color:var(--muted-d);max-width:660px;margin-top:.7rem}

/* ---------- product detail rows ---------- */
.prow{display:grid;grid-template-columns:1fr 1fr;gap:2.6rem;align-items:center;padding:2.8rem 0;border-bottom:1px solid var(--line-l)}
.prow:last-child{border-bottom:none}
.prow:nth-child(even) .pimg{order:2}
@media(max-width:880px){.prow{grid-template-columns:1fr}.prow:nth-child(even) .pimg{order:0}}
.prow .pimg{border:1px solid var(--line-l);border-radius:3px;overflow:hidden;background:var(--paper-2);position:relative}
.prow .pimg img{aspect-ratio:4/3;width:100%;object-fit:cover}
.prow .pimg .tag{position:absolute;left:0;top:0;background:var(--copper);color:#fff;font-family:var(--fm);font-size:.68rem;letter-spacing:.16em;padding:.32rem .8rem}
.prow .pimg.gfx{display:flex;align-items:center;justify-content:center;aspect-ratio:4/3;background:radial-gradient(circle at 30% 25%,#FDFBF7,#F3E9DC 70%)}
.prow .pimg.gfx svg{width:52%}
.prow .pimg.gfx svg *{stroke:#9A4E1C}
.prow .pimg.gfx svg [fill="#E59255"]{fill:#C46A2B;stroke:none}
.prow .code{font-family:var(--fm);font-size:.7rem;letter-spacing:.22em;color:var(--copper)}
.prow h2{font-family:var(--fd);font-weight:700;font-size:1.5rem;margin:.5rem 0 .8rem}
.prow .desc{font-size:.93rem;color:var(--muted-d)}
.ptable{margin-top:1.2rem;border:1px solid var(--line-l);border-radius:3px;overflow:hidden;font-family:var(--fm);font-size:.78rem}
.ptable .r{display:grid;grid-template-columns:150px 1fr;border-bottom:1px solid var(--line-l)}
.ptable .r:last-child{border-bottom:none}
.ptable .k{background:var(--paper-2);padding:.55rem .9rem;color:var(--muted-d);border-right:1px solid var(--line-l);letter-spacing:.06em}
.ptable .v{padding:.55rem .9rem;color:var(--text-d)}
.ptable .k::before{content:"▸ ";color:var(--copper)}

/* ---------- about ---------- */
.about-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:2.8rem;align-items:start}
@media(max-width:880px){.about-grid{grid-template-columns:1fr}}
.about-grid .big{font-size:1.06rem;line-height:1.9}
.about-grid .big b{color:var(--copper-deep)}
.fact-list{border:1px solid var(--line-l);border-radius:3px;background:#fff;overflow:hidden}
.fact-list .f{display:flex;justify-content:space-between;gap:1rem;padding:.95rem 1.2rem;border-bottom:1px solid var(--line-l);font-size:.9rem}
.fact-list .f:last-child{border-bottom:none}
.fact-list .f b{font-family:var(--fd);color:var(--copper-deep)}
.tline{margin-top:3rem;border-left:2px solid var(--copper);padding-left:1.6rem;display:flex;flex-direction:column;gap:1.5rem}
.tline .tl{position:relative}
.tline .tl::before{content:"";position:absolute;left:-1.98rem;top:.42rem;width:11px;height:11px;background:var(--paper);border:2px solid var(--copper);border-radius:50%}
.tline .tl b{font-family:var(--fd)}
.tline .tl span{display:block;font-size:.88rem;color:var(--muted-d)}

/* ---------- contact ---------- */
.cgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.4rem}
@media(max-width:880px){.cgrid{grid-template-columns:1fr}}
.ccard{background:#fff;border:1px solid var(--line-l);border-top:3px solid var(--copper);border-radius:3px;padding:1.6rem 1.5rem;transition:.3s}
.ccard:hover{transform:translateY(-4px);box-shadow:0 18px 36px rgba(23,18,14,.1)}
.ccard .lab{font-family:var(--fm);font-size:.68rem;letter-spacing:.22em;color:var(--muted-d);text-transform:uppercase}
.ccard .val{font-family:var(--fd);font-size:1.18rem;margin:.45rem 0 .3rem;word-break:break-all}
.ccard .val a:hover{color:var(--copper)}
.ccard .hint{font-size:.82rem;color:var(--muted-d)}
.note{margin-top:2.4rem;border:1px dashed var(--copper);border-radius:3px;background:rgba(196,106,43,.05);padding:1.4rem 1.6rem;font-size:.92rem}
.note b{color:var(--copper-deep)}

/* ---------- footer ---------- */
footer{background:var(--paper-2);color:var(--muted-d);border-top:3px solid var(--copper)}
footer .wrap{padding:3.2rem 0 0;display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:2rem}
@media(max-width:880px){footer .wrap{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){footer .wrap{grid-template-columns:1fr}}
footer h5{font-family:var(--fd);color:var(--text-d);font-size:.95rem;letter-spacing:.08em;margin-bottom:1rem}
footer .fbrand p{font-size:.86rem;line-height:1.8}
footer ul{list-style:none}
footer li{margin-bottom:.55rem;font-size:.88rem}
footer li a{transition:.2s}
footer li a:hover{color:var(--copper-deep)}
footer .fbottom{border-top:1px solid var(--line-l);margin-top:2.6rem;padding:1.1rem 0;font-family:var(--fm);font-size:.72rem;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap}
footer .fbottom a{color:var(--muted-d)}
footer .fbottom a:hover{color:var(--copper-deep)}