:root{
  --primary:#7c3aed;
  --secondary:#22d3ee;
  --accent:#f472b6;
  --ink:#05050f;
  --bg:#0b0b1e;
  --fg:#e6e6f3;
  --fg-muted:#9d9dc4;
  --surface:rgba(255,255,255,.06);
  --surface-alt:rgba(255,255,255,.03);
}
/* aurora-glass — Aurora Glass 极光玻璃 / 深紫渐变 + 毛玻璃 + 圆形 */
*{box-sizing:border-box;}
body{background:#0b0b1e;color:#e6e6f3;font-family:"Inter","Pretendard","Segoe UI",-apple-system,"PingFang SC",sans-serif;-webkit-font-smoothing:antialiased;}
::selection{background:#7c3aed;color:#fff;}
::-webkit-scrollbar{width:11px;}
::-webkit-scrollbar-track{background:rgba(255,255,255,.03);}
::-webkit-scrollbar-thumb{background:#7c3aed;border-radius:10px;}

.fill-primary{background:#7c3aed;color:#fff;}
.fill-secondary{background:#22d3ee;color:#fff;}
.fill-accent{background:#f472b6;color:#05050f;}
.fill-ink{background:#05050f;color:#0b0b1e;}
.fill-surface{background:rgba(255,255,255,.06);color:#e6e6f3;}
.fill-surface-alt{background:rgba(255,255,255,.03);color:#e6e6f3;}
.t-primary{color:#7c3aed;}
.t-secondary{color:#22d3ee;}
.t-accent{color:#f472b6;}
.t-muted{color:#9d9dc4;}
.grad{background:linear-gradient(135deg,#7c3aed 0%,#22d3ee 50%,#f472b6 100%);color:#fff;}
.t-grad{background:linear-gradient(135deg,#7c3aed 0%,#22d3ee 50%,#f472b6 100%);-webkit-background-clip:text;background-clip:text;color:transparent;}

.headline{font-family:"Space Grotesk","Inter","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:rgba(255,255,255,.03);color:#7c3aed;}

.card{background:rgba(255,255,255,.06);border:1px solid #05050f1f;border-radius:14px;transition:transform .25s ease,box-shadow .25s ease;box-shadow:0 0 0 1px #7c3aed33, 0 18px 50px -18px #7c3aed50;}
.card:hover,.card.video-card:hover{box-shadow:0 0 0 1px #7c3aed66, 0 24px 60px -18px #7c3aed90;transform:translateY(-3px);}
.card-soft{background:rgba(255,255,255,.03);border-radius:14px;}
.card-glass{background:rgba(255,255,255,.06);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);border:1px solid rgba(255,255,255,.12);border-radius:14px;}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;font-weight:800;letter-spacing:.02em;padding:.85rem 1.85rem;background:#7c3aed;color:#fff;border:1px solid #05050f26;border-radius:10px;transition:transform .2s ease,box-shadow .2s ease;box-shadow:0 0 18px #7c3aed80;}
.btn:hover{box-shadow:0 0 28px #7c3aed, 0 0 60px #7c3aed80;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:#7c3aed;border:1px solid #05050f;border:2px solid #7c3aed;border-radius:10px;transition:.2s;}
.btn-2:hover{background:#7c3aed;color:#fff;}
.btn-ink{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;font-weight:800;padding:.85rem 1.85rem;background:#05050f;color:#0b0b1e;border-radius:10px;transition:.2s;}
.btn-ink:hover{background:#22d3ee;}

.cat-tab{font-weight:700;background:rgba(255,255,255,.03);color:#9d9dc4;border-radius:10px;border:1px solid #05050f1a;transition:.15s;}
.cat-tab:hover{color:#7c3aed;}
.cat-tab.active{background:#7c3aed;color:#fff;border-color:#7c3aed;}

.nav-link{font-weight:700;color:#e6e6f3;padding:.4rem .6rem;border-radius:10px;transition:.18s;}
.nav-link:hover{color:#7c3aed;}
.nav-link.active{color:#7c3aed;}

.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:rgba(255,255,255,.06);border-left:1px solid #05050f33;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:rgba(255,255,255,.03);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;}}