/* AVTECH — engineering-datasheet design system
   Palette: paper / ink green-black / solder-mask green / signal orange */
:root{
  --paper:#F6F7F9;
  --panel:#FFFFFF;
  --ink:#131B28;
  --mut:#5A6675;
  --green:#123C6D;
  --green-deep:#0B2444;
  --green-tint:#E8EFF7;
  --line:#D9E0E8;
  --signal:#E8640C;
  --radius:6px;
  --maxw:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  font-family:'IBM Plex Sans','Noto Sans TC',sans-serif;
  background:var(--paper);color:var(--ink);
  font-size:16px;line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:'Archivo','Noto Sans TC',sans-serif;line-height:1.12;letter-spacing:-0.01em}
.mono{font-family:'IBM Plex Mono',monospace}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- header ---------- */
.topbar{background:var(--green-deep);color:#C9D8E8;font-size:12.5px}
.topbar .wrap{display:flex;justify-content:space-between;padding-top:6px;padding-bottom:6px}
.topbar span{font-family:'IBM Plex Mono',monospace;letter-spacing:.04em}
header.site{position:sticky;top:0;z-index:50;background:rgba(246,247,245,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:32px;height:66px}
.logo{font-family:'Archivo',sans-serif;font-weight:800;font-size:21px;letter-spacing:.02em;display:flex;align-items:center}
.logo img{height:30px;width:auto;display:block}
.logo em{font-style:normal;color:var(--green)}
.nav ul{display:flex;gap:20px;list-style:none;margin-left:auto;white-space:nowrap}
.nav ul a{font-size:14px;font-weight:500;color:var(--mut);padding:6px 0;border-bottom:2px solid transparent}
.nav ul a:hover,.nav ul a.on{color:var(--ink);border-color:var(--green)}
.nav .cta{margin-left:8px}
.btn{display:inline-block;font-weight:600;font-size:14.5px;padding:11px 22px;border-radius:var(--radius);border:1px solid transparent;transition:transform .12s ease,box-shadow .12s ease}
.btn:hover{transform:translateY(-1px)}
.btn:focus-visible,a:focus-visible{outline:2px solid var(--signal);outline-offset:2px}
.btn-signal{background:var(--signal);color:#fff}
.btn-ghost{border-color:var(--ink);color:var(--ink)}
.btn-green{background:var(--green);color:#fff}
.menu-btn{display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:var(--radius);padding:8px 12px;font-family:'IBM Plex Mono',monospace;font-size:13px;cursor:pointer}

/* ---------- hero ---------- */
.hero{padding:84px 0 0}
.eyebrow{font-family:'IBM Plex Mono',monospace;font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--green);margin-bottom:18px}
.hero h1{font-size:clamp(38px,5.4vw,64px);font-weight:800;max-width:15ch}
.hero p.lede{margin-top:22px;font-size:19px;color:var(--mut);max-width:56ch}
.hero-actions{display:flex;gap:14px;margin-top:32px;flex-wrap:wrap}

/* signature: traceability strip */
.trace{margin-top:64px;background:var(--green-deep);color:#E9F1FA;border-radius:var(--radius) var(--radius) 0 0;overflow:hidden}
.trace-head{display:flex;justify-content:space-between;align-items:center;padding:14px 26px;border-bottom:1px solid rgba(255,255,255,.14)}
.trace-head .t{font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:#8FAECB}
.stamp{font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.08em;border:1.5px solid #7FA3C8;color:#D3E4F4;padding:5px 12px;border-radius:3px;transform:rotate(-1.2deg)}
.trace-grid{display:grid;grid-template-columns:repeat(5,1fr)}
.trace-grid>div{padding:20px 26px;border-right:1px solid rgba(255,255,255,.1)}
.trace-grid>div:last-child{border-right:0}
.trace-grid .k{font-family:'IBM Plex Mono',monospace;font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:#8CA9C6;margin-bottom:6px}
.trace-grid .v{font-weight:600;font-size:15.5px;color:#fff}
.trace-grid .o{font-size:13px;color:#B4C9DE}

/* ---------- sections ---------- */
section.band{padding:88px 0}
section.band.tint{background:var(--panel);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{max-width:64ch;margin-bottom:44px}
.sec-head h2{font-size:clamp(26px,3.3vw,38px);font-weight:800}
.sec-head p{margin-top:14px;color:var(--mut);font-size:17px}

.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.band.tint .card{background:var(--paper)}
.card .k{font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--green);margin-bottom:12px}
.card h3{font-size:19px;margin-bottom:10px}
.card p{font-size:14.5px;color:var(--mut)}
.card.dark{background:var(--green-deep);border-color:var(--green-deep);color:#E9F1FA}
.card.dark h3{color:#fff}
.card.dark p{color:#B4C9DE}
.card.dark .k{color:#8CA9C6}

/* spec table */
table.spec{width:100%;border-collapse:collapse;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;font-size:14.5px}
table.spec th{font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.08em;text-transform:uppercase;text-align:left;color:#fff;background:var(--green);padding:12px 18px}
table.spec td{padding:13px 18px;border-top:1px solid var(--line);vertical-align:top}
table.spec td:first-child{font-weight:600;white-space:nowrap}
table.spec tr td .mono{font-size:13px;color:var(--green)}

/* product rows */
.prod{display:grid;grid-template-columns:150px 1fr auto;gap:26px;align-items:center;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:24px 28px;margin-bottom:16px}
.prod .ph{height:96px;border-radius:4px;background:linear-gradient(145deg,var(--green-tint),#fff);border:1px solid var(--line);display:flex;align-items:center;justify-content:center;font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--green);letter-spacing:.08em;text-align:center;padding:8px}
.prod h3{font-size:19px}
.prod .tag{display:inline-block;font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.08em;color:var(--green);background:var(--green-tint);border-radius:3px;padding:3px 8px;margin-left:10px;vertical-align:2px}
.prod .tag.gray{color:var(--mut);background:#ECEFF3}
.prod p{color:var(--mut);font-size:14.5px;margin-top:6px}

/* process steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--panel)}
.steps>div{padding:26px;border-right:1px solid var(--line)}
.steps>div:last-child{border-right:0}
.steps .n{font-family:'IBM Plex Mono',monospace;color:var(--signal);font-size:13px;margin-bottom:10px}
.steps h3{font-size:16.5px;margin-bottom:8px}
.steps p{font-size:13.5px;color:var(--mut)}

/* PSIRT / lists */
.rowlist{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--panel)}
.rowlist>div{display:flex;justify-content:space-between;gap:20px;padding:16px 22px;border-top:1px solid var(--line);font-size:14.5px}
.rowlist>div:first-child{border-top:0}
.rowlist .mono{color:var(--green);font-size:13px}

/* CTA band */
.cta-band{background:var(--green-deep);color:#fff;padding:72px 0}
.cta-band h2{font-size:clamp(26px,3.2vw,36px);max-width:24ch}
.cta-band p{color:#B4C9DE;margin-top:12px;max-width:56ch}
.cta-band .hero-actions{margin-top:28px}

/* forms */
form.inq{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:26px}
form.inq label{font-size:13px;font-weight:600;display:block;margin-bottom:6px}
form.inq input,form.inq select,form.inq textarea{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:var(--radius);font:inherit;font-size:14.5px;background:#fff}
form.inq .full{grid-column:1/-1}
form.inq button{grid-column:1/-1;justify-self:start}

/* footer */
footer.site{background:var(--ink);color:#A9B4C4;padding:56px 0 40px;font-size:14px}
footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px}
footer h4{color:#fff;font-size:14px;margin-bottom:14px}
footer a{display:block;padding:3px 0;color:#A9B4C4}
footer a:hover{color:#fff}
footer .legal{margin-top:40px;padding-top:20px;border-top:1px solid #26334A;font-family:'IBM Plex Mono',monospace;font-size:12px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* page hero (inner pages) */
.page-hero{padding:72px 0 56px;border-bottom:1px solid var(--line);background:var(--panel)}
.page-hero h1{font-size:clamp(32px,4.2vw,50px);font-weight:800;max-width:20ch}
.page-hero p{margin-top:16px;color:var(--mut);font-size:17.5px;max-width:62ch}

/* reveal */
.rv{opacity:0;transform:translateY(14px);transition:opacity .5s ease,transform .5s ease}
.rv.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.rv{opacity:1;transform:none;transition:none}}

/* responsive */
@media (max-width:960px){
  .grid3,.steps{grid-template-columns:1fr 1fr}
  .steps>div{border-bottom:1px solid var(--line)}
  footer .cols{grid-template-columns:1fr 1fr}
  .trace-grid{grid-template-columns:1fr 1fr}
  .trace-grid>div{border-bottom:1px solid rgba(255,255,255,.1)}
}
@media (max-width:1080px){
  .nav ul{display:none;position:absolute;top:66px;left:0;right:0;background:var(--paper);border-bottom:1px solid var(--line);flex-direction:column;gap:0;padding:10px 24px 18px}
  .nav ul.open{display:flex}
  .nav ul a{display:block;padding:10px 0}
  .menu-btn{display:block}
}
@media (max-width:680px){
  .nav .cta{display:none}
  .grid2,.grid3,.steps,form.inq{grid-template-columns:1fr}
  .prod{grid-template-columns:1fr}
  .trace-grid{grid-template-columns:1fr}
  footer .cols{grid-template-columns:1fr}
}

/* ---------- catalog grid ---------- */
.cat-title{font-size:20px;margin:44px 0 16px;color:var(--ink);scroll-margin-top:90px}
#catalog .cat-title:first-child{margin-top:0}
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.cat-card{display:flex;flex-direction:column;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:14px;transition:transform .12s ease,box-shadow .12s ease}
.cat-card:has(a.cat-link:hover){transform:translateY(-2px);box-shadow:0 6px 18px rgba(19,27,40,.08)}
.cat-link{display:block;flex:1}
.cat-ds{display:inline-block;margin-top:10px;font-family:'IBM Plex Mono',monospace;font-size:11.5px;letter-spacing:.03em;color:var(--green);border:1px solid var(--line);border-radius:4px;padding:4px 10px;align-self:flex-start}
.cat-ds:hover{border-color:var(--green);background:var(--green-tint)}
.cat-img{height:120px;display:flex;align-items:center;justify-content:center;background:linear-gradient(145deg,var(--green-tint),#fff);border-radius:4px;margin-bottom:10px;overflow:hidden}
.cat-img img{max-height:110px;width:auto;object-fit:contain}
.cat-card.noimg .cat-img::after{content:'—';color:var(--mut);font-size:20px}
.cat-model{font-size:12px;color:var(--green);letter-spacing:.04em}
.cat-name{font-size:13.5px;margin-top:2px;color:var(--ink)}
@media (max-width:960px){.cat-grid{grid-template-columns:repeat(3,1fr)}}
@media (max-width:680px){.cat-grid{grid-template-columns:repeat(2,1fr)}}

/* ---------- home banners（後台管理的輪播） ---------- */
#home-banners:empty{display:none}
#home-banners{max-width:var(--maxw);margin:40px auto 0;padding:0 24px}
.bnr{position:relative;border-radius:var(--radius);overflow:hidden;background:var(--green-tint)}
.bnr-slide{display:none;position:relative}
.bnr-slide.on{display:block}
.bnr-slide img{width:100%;max-height:420px;object-fit:cover;display:block}
.bnr-cap{position:absolute;left:0;right:0;bottom:0;padding:28px 32px 22px;background:linear-gradient(transparent,rgba(11,36,68,.82));color:#fff}
.bnr-t{font-family:'Archivo','Noto Sans TC',sans-serif;font-weight:800;font-size:clamp(20px,3vw,30px)}
.bnr-s{font-size:14.5px;opacity:.85;margin-top:4px}
.bnr-dots{position:absolute;right:18px;bottom:14px;display:flex;gap:8px}
.bnr-dots button{width:10px;height:10px;border-radius:99px;border:0;background:rgba(255,255,255,.45);cursor:pointer;padding:0}
.bnr-dots button.on{background:var(--signal)}

/* ---------- OEM 客製模擬器 ---------- */
.sim-grid{display:grid;grid-template-columns:390px 1fr;gap:26px;align-items:start}
.sim-panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.sim-panel .k{font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--green);margin:20px 0 8px}
.sim-panel .k:first-child{margin-top:0}
.opt-row{display:flex;gap:8px;flex-wrap:wrap}
.opt{display:inline-flex;flex-direction:column;align-items:center;border:1px solid var(--line);border-radius:var(--radius);padding:8px 12px;font:inherit;font-size:13.5px;cursor:pointer;background:#fff;color:var(--ink);transition:border-color .12s ease,background .12s ease}
/* 隱形粗體佔位：先把寬度撐到粗體版，選中變粗才不會位移換行 */
.opt::after{content:attr(data-t);font-weight:600;height:0;visibility:hidden;overflow:hidden;pointer-events:none}
.opt:hover{border-color:var(--green)}
.opt.on{border-color:var(--green);background:var(--green-tint);color:var(--green);font-weight:600}
.sim-lab{display:block;font-size:13px;font-weight:600;margin:10px 0 4px}
.sim-lab input{display:block;width:100%;margin-top:5px;padding:10px 12px;border:1px solid var(--line);border-radius:var(--radius);font:inherit;font-size:14px;background:#fff}
.logo-row{display:flex;align-items:center;gap:12px;margin-top:8px;flex-wrap:wrap}
.sim-upl{cursor:pointer}
.logo-chip{display:inline-flex;align-items:center;gap:10px;border:1px solid var(--line);border-radius:var(--radius);padding:6px 10px;background:#fff}
.logo-chip img{height:28px;max-width:110px;object-fit:contain;display:block}
.logo-del{border:0;background:none;color:var(--signal);font:inherit;font-size:13px;font-weight:600;cursor:pointer;padding:2px}
.sim-privacy{margin-top:18px;font-size:13px;color:var(--mut);border-top:1px solid var(--line);padding-top:14px}
.sim-preview{position:sticky;top:90px}
.sim-preview .k{font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--green);margin-bottom:8px}
.sim-stage{background:linear-gradient(145deg,var(--green-tint),#fff);border:1px solid var(--line);border-radius:var(--radius);padding:8px}
.sim-stage svg{width:100%;height:auto;display:block}
.sim-dlbtn{margin-top:16px;width:100%;text-align:center}
.sim-note{margin-top:12px;font-size:12.5px;color:var(--mut)}
.sim-note.sim-next a{color:var(--signal);font-weight:600}
@media (max-width:960px){.sim-grid{grid-template-columns:1fr}.sim-preview{position:static}}
.logo-chip[hidden]{display:none}