.cst20-shell{
  display:grid;
  grid-template-columns:300px 1fr;
  gap:20px;
  min-height:820px;
}
.cst20-sidebar{
  background:linear-gradient(180deg,#07101f 0%,#0b1220 40%,#0f172a 100%);
  color:#fff;
  border-radius:24px;
  padding:22px 18px;
  box-shadow:0 20px 60px rgba(2,6,23,.24);
  position:sticky;
  top:20px;
  align-self:start;
}
.cst20-brand-kicker,.cst20-kicker{
  display:inline-block;
  margin-bottom:8px;
  padding:6px 12px;
  border:1px solid rgba(255,255,255,.14);
  border-radius:999px;
  font-size:12px;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:#cbd5e1;
}
.cst20-brand h2,.cst20-topbar h1{
  margin:0 0 8px;
  font-size:30px;
  line-height:1.06;
  color:#fff;
}
.cst20-brand p{margin:0 0 18px;color:#cbd5e1}
.cst20-nav{display:flex;flex-direction:column;gap:10px;margin:18px 0 20px}
.cst20-nav-link{
  display:flex;
  align-items:center;
  justify-content:flex-start;
  padding:12px 14px;
  border-radius:16px;
  text-decoration:none;
  color:#fff;
  background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.08);
  font-weight:700;
  transition:.18s ease;
}
.cst20-nav-link:hover,.cst20-nav-link.is-active{
  background:#2563eb;
  border-color:#2563eb;
  transform:translateX(2px);
}
.cst20-side-note{
  margin-top:20px;
  padding:16px;
  border-radius:18px;
  background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.08);
}
.cst20-side-note p{margin:8px 0 0;color:#cbd5e1}
.cst20-main{
  background:linear-gradient(180deg,#07101f 0%,#0b1220 40%,#0f172a 100%);
  border-radius:24px;
  color:#fff;
  box-shadow:0 20px 60px rgba(2,6,23,.24);
  overflow:hidden;
}
.cst20-topbar{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px;
  padding:24px 24px 18px;
  border-bottom:1px solid rgba(255,255,255,.08);
}
.cst20-actions{display:flex;gap:10px;flex-wrap:wrap}
.cst20-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding:10px 14px;
  border-radius:14px;
  text-decoration:none;
  font-weight:700;
  background:#2563eb;
  color:#fff;
}
.cst20-btn-secondary{
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.12);
}
.cst20-content{padding:22px}
.cst20-content .cst18-shell,
.cst20-content .cst19-shell,
.cst20-content .cst17-dashboard{
  background:transparent !important;
  box-shadow:none !important;
  padding:0 !important;
  border-radius:0 !important;
}
.cst20-content .cst18-hero,
.cst20-content .cst18-grid,
.cst20-content .cst18-runtime,
.cst20-content .cst19-panel,
.cst20-content .cst19-card,
.cst20-content .cst19-tile,
.cst20-content .cst17-panel{
  background:rgba(255,255,255,.04) !important;
  border:1px solid rgba(255,255,255,.08) !important;
  border-radius:20px !important;
}
.cst20-content .cst18-hero-copy h1,
.cst20-content .cst19-header h1,
.cst20-content .cst17-dashboard h1{
  color:#fff !important;
}
.cst20-content .cst18-runtime-body .cst17-panel,
.cst20-content .cst17-panel{
  margin-bottom:16px !important;
}
.cst20-content input,
.cst20-content textarea,
.cst20-content select{
  width:100%;
  max-width:100%;
  box-sizing:border-box;
}
.cst20-missing{
  padding:20px;
  border-radius:18px;
  background:rgba(239,68,68,.12);
  border:1px solid rgba(239,68,68,.28);
}
@media (max-width:1150px){
  .cst20-shell{grid-template-columns:1fr}
  .cst20-sidebar{position:relative;top:auto}
  .cst20-topbar{flex-direction:column;align-items:flex-start}
}