/* site.css — smartswitchsupplier.com · 暗黑工业美学原型（2026-10-11 内容扩张+视觉优化）
   视觉签名 CIRCUIT-FLOW：hero 电路走线光效（手工 SVG + CSS dash 光流动画，无 AI 图） */
:root{
  --primary:#7C86FF; --secondary:#A5B4FC; --accent:#FF5C7A;
  --text:#EDEFF5; --muted:#9AA3B5; --bg:#0B0E14; --bg-alt:#11161F;
  --border:#232B3D; --dark-bg:#141021; --dark-text:#D8DBE6;
  --card:#141A26;
  --container:1200px; --section-pad:96px; --card-gap:24px;
  --r-card:14px; --r-btn:10px; --r-input:8px;
  --font-h:"Space Grotesk","Inter",system-ui,sans-serif;
  --font-b:"Inter",system-ui,-apple-system,sans-serif;
  --font-m:"IBM Plex Mono",ui-monospace,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
html.js .reveal{opacity:0;transform:translateY(24px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
html.js .reveal.is-visible{opacity:1;transform:none}
body{font-family:var(--font-b);color:var(--text);background:var(--bg);line-height:1.65;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--secondary);text-decoration:none}
@media (hover: hover){a:hover{text-decoration:underline}}
h1,h2,h3{font-family:var(--font-h);line-height:1.2;letter-spacing:-.01em}
h1{font-size:clamp(2rem,4.5vw,3.25rem);font-weight:700}
h2{font-size:clamp(1.5rem,3vw,2.125rem);font-weight:700;margin-bottom:1rem}
h3{font-size:1.25rem;font-weight:600;margin-bottom:.5rem}
p{margin-bottom:1rem}
.container{max-width:var(--container);margin:0 auto;padding:0 24px}
section{padding:var(--section-pad) 0}
.section-alt{background:var(--bg-alt)}
.section-dark{background:var(--dark-bg);color:var(--dark-text)}
.section-dark h2,.section-dark h3{color:#fff}
.section-dark p{color:#B9B3D9}
.eyebrow{display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--primary);margin-bottom:.75rem}
.section-dark .eyebrow{color:var(--secondary)}

/* header */
.site-header{position:sticky;top:0;z-index:100;background:#0B0E14;border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand{font-family:var(--font-h);font-weight:700;font-size:1.25rem;color:var(--text);display:flex;align-items:center;gap:.5rem}
@media (hover: hover){.brand:hover{text-decoration:none}}
.brand-mark{width:32px;height:32px;border-radius:8px;background:linear-gradient(135deg,var(--primary),var(--secondary));display:inline-flex;align-items:center;justify-content:center;color:#0B0E14;font-weight:700}
.main-nav{display:flex;align-items:center;gap:1.75rem}
.main-nav a{color:var(--text);font-weight:500;font-size:.95rem}
@media (hover: hover){.main-nav a:hover{color:var(--primary);text-decoration:none}}
.nav-cta{display:flex;gap:.75rem;align-items:center}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:.75rem 1.5rem;border-radius:var(--r-btn);font-weight:600;font-size:.95rem;border:1px solid transparent;cursor:pointer;transition:transform .15s var(--ease),box-shadow .15s var(--ease)}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--accent);color:#fff}
@media (hover: hover){.btn-primary:hover{background:#E8456A;text-decoration:none;color:#fff;box-shadow:0 8px 28px rgba(255,92,122,.35)}}
.btn-secondary{background:var(--primary);color:#0B0E14}
@media (hover: hover){.btn-secondary:hover{background:var(--secondary);text-decoration:none;color:#0B0E14}}
.btn-ghost{border-color:var(--border);color:var(--text);background:transparent}
@media (hover: hover){.btn-ghost:hover{border-color:var(--primary);color:var(--primary);text-decoration:none}}

/* hero + 视觉签名 CIRCUIT-FLOW（电路走线光效） */
.hero{padding:80px 0 96px;position:relative;overflow:hidden;background:radial-gradient(1200px 500px at 80% -10%,rgba(124,134,255,.14),transparent 60%),linear-gradient(180deg,#0D1220 0%,#0B0E14 100%)}
.page-hero{padding:64px 0;position:relative;overflow:hidden;background:radial-gradient(900px 380px at 85% -10%,rgba(124,134,255,.12),transparent 60%),linear-gradient(180deg,#0D1220 0%,#0B0E14 100%)}
.circuit-flow{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;opacity:.9}
.circuit-flow .trace{fill:none;stroke:#2A3550;stroke-width:2}
.circuit-flow .pad{fill:#0B0E14;stroke:#2A3550;stroke-width:2}
.circuit-flow .pulse{fill:none;stroke:var(--primary);stroke-width:2.5;stroke-linecap:round;stroke-dasharray:46 620;animation:circuit-pulse 7s linear infinite;filter:drop-shadow(0 0 6px rgba(124,134,255,.9))}
.circuit-flow .pulse.p2{animation-duration:9s;animation-delay:2.2s;stroke:var(--accent);filter:drop-shadow(0 0 6px rgba(255,92,122,.8))}
.circuit-flow .pulse.p3{animation-duration:11s;animation-delay:4.6s}
@keyframes circuit-pulse{to{stroke-dashoffset:-666}}
.hero-grid{display:grid;grid-template-columns:7fr 5fr;gap:48px;align-items:center;position:relative}
.hero h1{margin-bottom:1rem}
.hero .lede{font-size:1.15rem;color:var(--muted);margin-bottom:1.75rem;max-width:36rem}
.hero-ctas{display:flex;gap:1rem;flex-wrap:wrap;margin-bottom:2rem}
.trust-bar{display:flex;gap:2rem;flex-wrap:wrap}
.trust-item{display:flex;flex-direction:column}
.trust-item strong{font-family:var(--font-h);font-size:1.5rem;color:var(--primary)}
.trust-item span{font-size:.85rem;color:var(--muted)}
.finder-teaser{background:var(--card);border:1px solid var(--border);border-radius:var(--r-card);padding:2rem;box-shadow:0 20px 60px rgba(0,0,0,.45);position:relative}
.finder-teaser h3{margin-bottom:1rem}
.finder-teaser .field{margin-bottom:1rem}
.finder-teaser label{display:block;font-size:.85rem;font-weight:600;margin-bottom:.375rem}
.finder-teaser select{width:100%;padding:.7rem;border:1px solid var(--border);border-radius:var(--r-input);font-size:.95rem;background:#0B0E14;color:var(--text)}

/* finder */
.finder{border:1px solid var(--border);border-radius:var(--r-card);overflow:hidden;background:var(--card)}
.finder-grid{display:grid;grid-template-columns:4fr 8fr}
.finder-filters{padding:2rem;border-right:1px solid var(--border);background:var(--bg-alt)}
.finder-filters h3{margin-bottom:1.25rem}
.filter-group{margin-bottom:1.25rem}
.filter-group legend,.filter-group .fg-label{font-size:.85rem;font-weight:700;margin-bottom:.5rem;display:block}
.chip-row{display:flex;flex-wrap:wrap;gap:.5rem}
.chip{padding:.5rem .9rem;border:1px solid var(--border);border-radius:999px;font-size:.85rem;cursor:pointer;background:#0B0E14;color:var(--text);transition:border-color .15s var(--ease),background-color .15s var(--ease),color .15s var(--ease)}
@media (hover: hover){ .chip:hover{border-color:var(--primary)} }
.chip[aria-pressed="true"]{background:var(--primary);color:#0B0E14;border-color:var(--primary)}
.finder-results{padding:2rem}
.results-meta{font-size:.9rem;color:var(--muted);margin-bottom:1rem}
.model-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--card-gap)}
.model-card{border:1px solid var(--border);border-radius:var(--r-card);overflow:hidden;background:var(--card);transition:transform .2s var(--ease),box-shadow .2s var(--ease)}
@media (hover: hover){ .model-card:hover{transform:translateY(-4px);box-shadow:0 16px 40px rgba(124,134,255,.18)} }
.model-card img{aspect-ratio:1;object-fit:cover;width:100%;background:#1A2130}
.model-card-body{padding:1rem}
.model-card h4{font-size:.95rem;font-family:var(--font-m);font-weight:500;margin-bottom:.5rem;line-height:1.4}
.model-tags{display:flex;flex-wrap:wrap;gap:.375rem;margin-bottom:.75rem}
.tag{font-size:.72rem;font-weight:600;padding:.2rem .55rem;border-radius:6px;background:#1E2740;color:var(--secondary)}
.model-card .btn{width:100%;padding:.6rem;font-size:.85rem}

/* cards / grids */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--card-gap)}
.card{border:1px solid var(--border);border-radius:var(--r-card);padding:1.75rem;background:var(--card)}
.card img{border-radius:8px;margin-bottom:1rem}
.two-col{display:grid;grid-template-columns:8fr 4fr;gap:48px}
.sidebar .side-card{border:1px solid var(--border);border-radius:var(--r-card);padding:1.5rem;margin-bottom:1.5rem;background:var(--card)}
.sidebar h3{font-size:1.05rem;margin-bottom:.75rem}
.check-list{list-style:none}
.check-list li{padding:.5rem 0 .5rem 1.75rem;position:relative;border-bottom:1px solid var(--border)}
.check-list li:last-child{border:0}
.check-list li::before{content:"✓";position:absolute;left:0;color:var(--primary);font-weight:700}

/* cert band */
.cert-band{display:grid;grid-template-columns:repeat(4,1fr);gap:var(--card-gap);margin-top:2.5rem}
.cert-item{text-align:center;padding:1.5rem}
.cert-item .cert-badge{width:64px;height:64px;margin:0 auto 1rem;border-radius:50%;background:rgba(124,134,255,.12);display:flex;align-items:center;justify-content:center;font-family:var(--font-h);font-weight:700;color:var(--secondary);font-size:1.1rem;border:2px solid var(--secondary)}
.cert-item h3{color:#fff;font-size:1.05rem}
.cert-item p{color:#B9B3D9;font-size:.9rem;margin:0}

/* forms */
.lead-form{display:grid;gap:1rem}
.lead-form label{font-size:.9rem;font-weight:600}
.lead-form input,.lead-form select,.lead-form textarea{width:100%;padding:.8rem;border:1px solid var(--border);border-radius:var(--r-input);font-size:1rem;font-family:var(--font-b);background:#0B0E14;color:var(--text)}
.lead-form input:focus,.lead-form select:focus,.lead-form textarea:focus{outline:2px solid var(--secondary);border-color:var(--primary)}
.honeypot{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
.form-note{font-size:.85rem;color:var(--muted)}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.contact-card{border:1px solid var(--border);border-radius:var(--r-card);padding:2rem;background:var(--card)}
.contact-row{display:flex;gap:1rem;padding:.75rem 0;border-bottom:1px solid var(--border)}
.contact-row:last-child{border:0}
.contact-row strong{min-width:90px}

/* footer */
.site-footer{background:#070A10;color:#8E96AB;padding:64px 0 32px;margin-top:0;border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:2.5rem}
.site-footer h4{color:#fff;font-size:1rem;margin-bottom:1rem}
.site-footer a{color:#8E96AB;font-size:.9rem}
.site-footer ul{list-style:none}
.site-footer li{margin-bottom:.5rem}
.footer-bottom{border-top:1px solid #161C2A;padding-top:1.5rem;font-size:.85rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:1rem}

/* misc */
.breadcrumb{font-size:.85rem;color:var(--muted);margin-bottom:1rem}
.breadcrumb a{color:var(--muted)}
.page-hero h1{margin-bottom:.75rem}
.page-hero .container{position:relative}
.hero .container{position:relative}
.table-wrap{overflow-x:auto;max-width:100%}
table{width:100%;border-collapse:collapse;font-size:.95rem}
th,td{padding:.75rem 1rem;border:1px solid var(--border);text-align:left}
th{background:var(--bg-alt);font-weight:600}
.prose-layout{display:grid;grid-template-columns:7fr 5fr;gap:48px}
.prose-layout>*{min-width:0}
.blog-list{display:grid;gap:1.5rem}
.blog-card{border:1px solid var(--border);border-radius:var(--r-card);padding:1.5rem;background:var(--card)}

/* responsive */
@media (max-width:1024px){
  .hero-grid{grid-template-columns:1fr}
  .finder-grid{grid-template-columns:1fr}
  .finder-filters{border-right:0;border-bottom:1px solid var(--border)}
  .model-grid{grid-template-columns:repeat(2,1fr)}
  .card-grid{grid-template-columns:repeat(2,1fr)}
  .two-col{grid-template-columns:1fr}
  .prose-layout{grid-template-columns:1fr}
  .cert-band{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .contact-grid{grid-template-columns:1fr}
}
@media (max-width:899px){
  .nav-toggle{display:block;background:none;border:0;font-size:1.5rem;cursor:pointer;color:var(--text)}
  .main-nav{display:none;position:absolute;top:72px;left:0;right:0;background:#0B0E14;flex-direction:column;align-items:stretch;padding:1rem 24px 1.5rem;border-bottom:1px solid var(--border);gap:0}
  .main-nav.open{display:flex}
  .main-nav a{padding:.75rem 0;border-bottom:1px solid var(--border)}
  .nav-cta .btn{padding:.6rem 1rem;font-size:.85rem}
}
@media (max-width:640px){
  :root{--section-pad:64px}
  .model-grid{grid-template-columns:1fr}
  .card-grid{grid-template-columns:1fr}
  .cert-band{grid-template-columns:1fr}
  .hero{padding:48px 0 64px}
  .trust-bar{gap:1.25rem}
  .footer-grid{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
  html{scroll-behavior:auto}
}