/* WUCHUAN TECH — The Circuit Board */
:root{
  --carbon:#0b0d10;
  --panel:#13161b;
  --panel2:#181c22;
  --line:#242b35;
  --jade:#2fbf8f;
  --copper:#d08b45;
  --cyan:#5aa9d6;
  --seal:#c24534;
  --paper:#efe9da;
  --ink:#e9edf0;
  --mut:#9aa4ae;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:var(--carbon);color:var(--ink);font:16px/1.65 "Noto Sans SC","Inter",sans-serif;letter-spacing:.01em}
html:not(.zh) .zh{display:none!important}
html.zh .en{display:none!important}
html.zh .zh{display:revert!important}
html.zh body{font-family:"Noto Sans SC",sans-serif}
::selection{background:var(--jade);color:var(--carbon)}

/* via-dot border strips */
.vias{height:16px;background-color:#101318;
  background-image:
    radial-gradient(circle 2.2px at 9px 8px, var(--copper) 96%, transparent),
    repeating-linear-gradient(90deg, var(--line) 0 2px, transparent 2px 30px);
  background-size:30px 16px,30px 16px;background-repeat:repeat-x}
.vias.b{background-image:
    radial-gradient(circle 2.2px at 9px 8px, var(--jade) 96%, transparent),
    repeating-linear-gradient(90deg, var(--line) 0 2px, transparent 2px 30px)}

.wrap{max-width:1120px;margin:0 auto;padding:0 26px}
.mono{font-family:"IBM Plex Mono",monospace}
.mut{color:var(--mut)}

/* nav */
nav{position:sticky;top:0;z-index:30;display:flex;align-items:center;justify-content:space-between;padding:16px 0;background:var(--carbon);border-bottom:1px solid var(--line)}
.logo{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--paper);font-family:"Space Grotesk","Noto Sans SC",sans-serif;font-weight:700;font-size:1.02rem;letter-spacing:.06em}
.logo svg{width:38px;height:38px;flex:none}
.links{display:flex;gap:4px;align-items:center}
.links a{color:var(--mut);text-decoration:none;font-size:.84rem;padding:8px 11px;border-radius:3px;letter-spacing:.02em}
.links a:hover{color:var(--paper);background:var(--panel2)}
.links a.cta{color:var(--carbon);background:var(--jade);font-weight:700;margin-left:8px}
.links a.cta:hover{background:var(--paper)}
.langbtn{background:var(--panel2);border:1px solid var(--line);color:var(--paper);font:700 .78rem "IBM Plex Mono",monospace;padding:8px 12px;border-radius:3px;cursor:pointer;margin-left:10px;letter-spacing:.08em}
.langbtn:hover{border-color:var(--jade);color:var(--jade)}
.burger{display:none;background:none;border:1px solid var(--line);color:var(--paper);font-size:1.1rem;padding:6px 11px;border-radius:3px;cursor:pointer}

/* hero */
.hero{display:grid;grid-template-columns:1.02fr .98fr;gap:56px;align-items:center;padding:74px 0 60px}
.kick{font:700 .7rem "IBM Plex Mono",monospace;letter-spacing:.26em;color:var(--jade);margin-bottom:18px}
.kick b{color:var(--copper)}
h1,h2,h3{font-family:"Space Grotesk","Noto Sans SC",sans-serif;color:var(--paper);line-height:1.18;letter-spacing:-.01em}
h1{font-size:2.9rem;font-weight:700}
h1 .accent{color:var(--jade)}
html.zh h1,html.zh h2,html.zh h3{letter-spacing:.02em}
.lede{color:var(--mut);font-size:1.02rem;margin-top:18px;max-width:520px}
.lede strong{color:var(--ink)}
.bts{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap}
.btn{font:700 .82rem "IBM Plex Mono","Noto Sans SC",monospace;letter-spacing:.09em;padding:13px 24px;border-radius:3px;text-decoration:none;border:1px solid var(--jade)}
.btn.solid{background:var(--jade);color:var(--carbon)}
.btn.solid:hover{background:var(--paper);border-color:var(--paper)}
.btn.ghost{color:var(--jade)}
.btn.ghost:hover{background:var(--panel2)}

.stats{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.stat{padding:26px 8px;text-align:center;border-right:1px solid var(--line)}
.stat:last-child{border-right:0}
.stat b{display:block;font:700 2rem "Space Grotesk","IBM Plex Mono",monospace;color:var(--paper)}
.stat span{font:600 .68rem "IBM Plex Mono",monospace;letter-spacing:.2em;color:var(--mut)}
.stat.g b{color:var(--jade)} .stat.c b{color:var(--copper)} .stat.b b{color:var(--cyan)}

/* sections */
.sec{padding:64px 0;border-top:1px solid var(--line)}
.sec-head{max-width:720px;margin-bottom:38px}
.sec-head p{color:var(--mut);margin-top:14px}
h2{font-size:1.9rem;font-weight:700}

/* bank cards on index */
.banks{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border:1px solid var(--line)}
.bank{padding:30px 26px;border-right:1px solid var(--line);background:var(--panel)}
.bank:last-child{border-right:0}
.bank .btag{font:700 .68rem "IBM Plex Mono",monospace;letter-spacing:.22em;padding:5px 10px;border-radius:2px;display:inline-block;margin-bottom:16px}
.bank.s .btag{background:var(--jade);color:var(--carbon)}
.bank.r .btag{background:var(--copper);color:var(--carbon)}
.bank.i .btag{background:var(--cyan);color:var(--carbon)}
.bank h3{font-size:1.15rem;margin-bottom:10px}
.bank p{color:var(--mut);font-size:.9rem}
.bank .cnt{margin-top:16px;font:700 .72rem "IBM Plex Mono",monospace;letter-spacing:.16em}
.bank.s .cnt{color:var(--jade)} .bank.r .cnt{color:var(--copper)} .bank.i .cnt{color:var(--cyan)}

/* pin rows */
.pbank{border:1px solid var(--line);margin-bottom:30px}
.pbank-head{display:flex;align-items:center;gap:18px;background:var(--panel2);padding:15px 20px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.pbank-head h3{font-size:1.02rem;letter-spacing:.04em}
.ptag{font:700 .66rem "IBM Plex Mono",monospace;letter-spacing:.22em;padding:4px 9px;border-radius:2px}
.pb.s .ptag{background:var(--jade);color:var(--carbon)}
.pb.r .ptag{background:var(--copper);color:var(--carbon)}
.pb.i .ptag{background:var(--cyan);color:var(--carbon)}
.pcount{margin-left:auto;font:700 .7rem "IBM Plex Mono",monospace;color:var(--mut);letter-spacing:.14em}
.prow{display:grid;grid-template-columns:118px 1fr auto;gap:16px;align-items:center;padding:13px 20px;border-bottom:1px solid var(--line);background:var(--panel)}
.prow:last-child{border-bottom:0}
.prow:hover{background:var(--panel2)}
.pin{font:700 .82rem "IBM Plex Mono",monospace;display:flex;flex-direction:column;line-height:1.3}
.pb.s .pin{color:var(--jade)} .pb.r .pin{color:var(--copper)} .pb.i .pin{color:var(--cyan)}
.pin small{font-size:.6rem;letter-spacing:.14em;color:var(--mut);font-weight:400}
.pname{font-weight:600;font-size:.92rem;color:var(--ink)}
.pname small{display:block;font-weight:400;color:var(--mut);font-size:.78rem;margin-top:2px}
.pcat{font:700 .64rem "IBM Plex Mono",monospace;letter-spacing:.14em;color:var(--mut);border:1px solid var(--line);padding:4px 9px;border-radius:2px;white-space:nowrap}

/* split / svg panel */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}
.split svg{max-width:100%;height:auto;border:1px solid var(--line);background:var(--panel)}
.hero svg{max-width:100%;height:auto}

/* contact cards */
.cgrid{display:grid;grid-template-columns:.92fr 1.08fr;gap:40px;align-items:start}
.ccard{border:1px solid var(--line);border-left:3px solid var(--jade);background:var(--panel);padding:18px 20px;margin-bottom:14px}
.clab{font:700 .66rem "IBM Plex Mono",monospace;letter-spacing:.2em;color:var(--mut);margin-bottom:7px}
.cval{color:var(--paper);font-weight:600;font-size:.95rem;line-height:1.55}
.req{border:1px solid var(--line);background:var(--panel)}
.req .fhead{display:flex;justify-content:space-between;align-items:center;background:var(--panel2);padding:14px 20px;border-bottom:1px solid var(--line)}
form{padding:22px 20px}
label{display:block;font:700 .66rem "IBM Plex Mono","Noto Sans SC",monospace;letter-spacing:.16em;color:var(--mut);margin-bottom:6px}
input,select,textarea{width:100%;background:var(--carbon);border:1px solid var(--line);color:var(--paper);font:400 .9rem "Noto Sans SC",sans-serif;padding:11px 12px;border-radius:2px}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--jade)}
textarea{min-height:110px;resize:vertical}
.frow{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}
.frow.one{grid-template-columns:1fr}
.fnote{font-size:.74rem;color:var(--mut);margin-top:12px}

/* rules / faq / legal */
.rules3{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border:1px solid var(--line)}
.rule3{padding:24px 22px;border-right:1px solid var(--line);background:var(--panel);border-top:3px solid var(--jade)}
.rule3:last-child{border-right:0}
.rule3 h3{font-size:1rem;margin-bottom:8px}
.rule3 p{color:var(--mut);font-size:.85rem}
.faq details{border:1px solid var(--line);background:var(--panel);margin-bottom:10px}
.faq summary{cursor:pointer;list-style:none;padding:16px 20px;font-weight:600;color:var(--paper);font-size:.95rem}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"▸";color:var(--jade);margin-right:10px;font-family:"IBM Plex Mono",monospace}
.faq details[open] summary::before{content:"▾"}
.faq .fa{padding:0 20px 18px;color:var(--mut);font-size:.88rem;border-top:1px solid var(--line);padding-top:14px}
.legal h3{font-size:1.08rem;margin:30px 0 10px;color:var(--paper)}
.legal p,.legal li{color:var(--mut);font-size:.92rem;margin-bottom:10px}
.legal ul{padding-left:22px;margin-bottom:10px}
.legal strong{color:var(--ink)}

/* footer */
footer{border-top:1px solid var(--line);background:var(--panel);padding:46px 0 30px;margin-top:40px}
.fgrid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px}
.fgrid h4{font:700 .68rem "IBM Plex Mono",monospace;letter-spacing:.2em;color:var(--jade);margin-bottom:14px}
.fgrid a{display:block;color:var(--mut);text-decoration:none;font-size:.85rem;margin-bottom:8px}
.fgrid a:hover{color:var(--paper)}
.fbot{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;border-top:1px solid var(--line);margin-top:34px;padding-top:20px;font:400 .72rem "IBM Plex Mono",monospace;color:var(--mut);letter-spacing:.06em}

@media(max-width:920px){
  .hero,.split,.cgrid{grid-template-columns:1fr;gap:36px}
  .banks,.rules3{grid-template-columns:1fr}
  .bank,.rule3{border-right:0;border-bottom:1px solid var(--line)}
  .bank:last-child,.rule3:last-child{border-bottom:0}
  .stats{grid-template-columns:1fr 1fr 1fr}
  .prow{grid-template-columns:92px 1fr;gap:10px}
  .pcat{display:none}
  h1{font-size:2.1rem}
  .links{display:none;position:absolute;top:66px;left:0;right:0;flex-direction:column;background:var(--panel);border-bottom:1px solid var(--line);padding:12px;align-items:stretch}
  .links.open{display:flex}
  .links a{padding:12px}
  .burger{display:block}
}