:root{
  --primary:#ff2bd3;
  --secondary:#00f5ff;
  --accent:#f9ed4d;
  --ink:#02030a;
  --bg:#06070d;
  --fg:#d7dbf0;
  --fg-muted:#7a83ad;
  --surface:#0d0f1c;
  --surface-alt:#11132a;
}
/* cyberpunk-neon — Cyberpunk Neon 赛博朋克霓虹 / 深黑 + 青粉电光 + 字符故障 */
*{box-sizing:border-box;}
body{background:#06070d;color:#d7dbf0;font-family:"JetBrains Mono","Fira Code","Source Han Sans",monospace;-webkit-font-smoothing:antialiased;}
::selection{background:#ff2bd3;color:#fff;}
::-webkit-scrollbar{width:11px;}
::-webkit-scrollbar-track{background:#11132a;}
::-webkit-scrollbar-thumb{background:#ff2bd3;border-radius:0;}

.fill-primary{background:#ff2bd3;color:#fff;}
.fill-secondary{background:#00f5ff;color:#fff;}
.fill-accent{background:#f9ed4d;color:#02030a;}
.fill-ink{background:#02030a;color:#06070d;}
.fill-surface{background:#0d0f1c;color:#d7dbf0;}
.fill-surface-alt{background:#11132a;color:#d7dbf0;}
.t-primary{color:#ff2bd3;}
.t-secondary{color:#00f5ff;}
.t-accent{color:#f9ed4d;}
.t-muted{color:#7a83ad;}
.grad{background:linear-gradient(135deg,#ff2bd3,#00f5ff);color:#fff;}
.t-grad{background:linear-gradient(135deg,#ff2bd3,#00f5ff);-webkit-background-clip:text;background-clip:text;color:transparent;}

.headline{font-family:"Orbitron","JetBrains Mono","PingFang SC",sans-serif;font-weight:800;letter-spacing:-.01em;line-height:1.08;}
.tag{font-weight:800;font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;}
.chip{display:inline-flex;align-items:center;gap:.4rem;font-weight:700;font-size:.78rem;padding:.4rem .9rem;border-radius:9999px;background:#11132a;color:#ff2bd3;}

.card{background:#0d0f1c;border:1px solid #02030a1f;border-radius:0;transition:transform .25s ease,box-shadow .25s ease;box-shadow:0 0 0 1px #ff2bd333, 0 18px 50px -18px #ff2bd350;}
.card:hover,.card.video-card:hover{box-shadow:0 0 0 1px #ff2bd366, 0 24px 60px -18px #ff2bd390;transform:translateY(-3px);}
.card-soft{background:#11132a;border-radius:0;}
.card-glass{background:#0d0f1c;backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);border:1px solid rgba(255,255,255,.12);border-radius:0;}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;font-weight:800;letter-spacing:.02em;padding:.85rem 1.85rem;background:#ff2bd3;color:#fff;border:1px solid #02030a26;border-radius:0;transition:transform .2s ease,box-shadow .2s ease;box-shadow:0 0 18px #ff2bd380;}
.btn:hover{box-shadow:0 0 28px #ff2bd3, 0 0 60px #ff2bd380;transform:translateY(-2px);}
.btn-2{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;font-weight:800;letter-spacing:.02em;padding:.85rem 1.85rem;background:transparent;color:#ff2bd3;border:1px solid #02030a;border:2px solid #ff2bd3;border-radius:0;transition:.2s;}
.btn-2:hover{background:#ff2bd3;color:#fff;}
.btn-ink{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;font-weight:800;padding:.85rem 1.85rem;background:#02030a;color:#06070d;border-radius:0;transition:.2s;}
.btn-ink:hover{background:#00f5ff;}

.cat-tab{font-weight:700;background:#11132a;color:#7a83ad;border-radius:0;border:1px solid #02030a1a;transition:.15s;}
.cat-tab:hover{color:#ff2bd3;}
.cat-tab.active{background:#ff2bd3;color:#fff;border-color:#ff2bd3;}

.nav-link{font-weight:700;color:#d7dbf0;padding:.4rem .6rem;border-radius:0;transition:.18s;}
.nav-link:hover{color:#ff2bd3;}
.nav-link.active{color:#ff2bd3;}

.nav{display:flex;}
@media(max-width:1023px){
  .nav{position:fixed;top:0;right:0;bottom:0;width:80%;max-width:320px;flex-direction:column;align-items:stretch;gap:.6rem;background:#0d0f1c;border-left:1px solid #02030a33;padding:6rem 1.5rem 2rem;transform:translateX(101%);transition:transform .22s ease;z-index:60;overflow-y:auto;}
  .nav.active{transform:translateX(0);}
  .menu-overlay{position:fixed;inset:0;background:rgba(0,0,0,.55);opacity:0;visibility:hidden;transition:opacity .2s;z-index:55;}
  .menu-overlay.active{opacity:1;visibility:visible;}
  body.menu-open{overflow:hidden;}
  .nav-link{background:#11132a;padding:.7rem 1rem;}
}

.faq-answer{max-height:0;overflow:hidden;opacity:0;transition:max-height .3s ease,opacity .3s ease;}
.faq-item.active .faq-icon{transform:rotate(45deg);}
.faq-icon{transition:transform .2s ease;}

.back-to-top{opacity:0;visibility:hidden;transition:opacity .25s,transform .25s;}
.back-to-top.visible{opacity:1;visibility:visible;}

@media print{header,footer,.no-print{display:none;}}