.nd-container { width: min(calc(100% - 2rem), var(--nd-content-md)); margin-inline: auto; }
.nd-container--wide { width: min(calc(100% - 2rem), var(--nd-content-lg)); margin-inline: auto; }
.nd-section { padding-block: var(--nd-space-12); }
.nd-section + .nd-section { border-top: var(--nd-border); }
.nd-stack { display: flex; flex-direction: column; gap: var(--nd-space-4); }
.nd-stack--sm { gap: var(--nd-space-2); }
.nd-stack--lg { gap: var(--nd-space-8); }
.nd-cluster { display: flex; flex-wrap: wrap; align-items: center; gap: var(--nd-space-3); }
.nd-grid { display: grid; gap: var(--nd-space-4); }
.nd-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.nd-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.nd-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.nd-app-shell { min-height: 100vh; }
.nd-app-header {
  position: sticky;
  top: 0;
  z-index: var(--nd-z-sticky);
  height: var(--nd-header-height);
  border-bottom: var(--nd-border);
  background: rgb(255 255 255 / 94%);
  backdrop-filter: blur(14px);
}
.nd-app-header__inner {
  width: min(calc(100% - 2rem), var(--nd-content-lg));
  height: 100%;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--nd-space-4);
}
.nd-brand { display: inline-flex; align-items: center; gap: var(--nd-space-3); color: inherit; text-decoration: none; }
.nd-brand img { width: 184px; height: auto; }
.nd-app-body { display: grid; grid-template-columns: var(--nd-sidebar-width) minmax(0, 1fr); min-height: calc(100vh - var(--nd-header-height)); }
.nd-sidebar { background: var(--nd-color-brand-900); color: #fff; padding: var(--nd-space-6) var(--nd-space-4); }
.nd-sidebar__title { margin-bottom: var(--nd-space-4); color: #fff; font-size: var(--nd-text-sm); letter-spacing: 0.08em; text-transform: uppercase; }
.nd-main { min-width: 0; padding: var(--nd-space-8); }
.nd-main__inner { width: min(100%, var(--nd-content-md)); margin-inline: auto; }
.nd-demo-banner { background: var(--nd-color-amber-50); border-bottom: 1px solid var(--nd-color-amber-100); color: var(--nd-color-amber-700); font-size: var(--nd-text-sm); font-weight: 650; text-align: center; padding: var(--nd-space-2) var(--nd-space-4); }

@media (max-width: 980px) {
  .nd-grid--4, .nd-grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .nd-app-body { grid-template-columns: 1fr; }
  .nd-sidebar { display: none; }
  .nd-sidebar.is-open { display: block; position: fixed; inset: calc(var(--nd-header-height) + 2.4rem) 0 0 0; z-index: var(--nd-z-modal); overflow-y: auto; }
  .nd-main { padding: var(--nd-space-6) var(--nd-space-4); }
}

@media (max-width: 640px) {
  .nd-container, .nd-container--wide { width: min(calc(100% - 1rem), var(--nd-content-lg)); }
  .nd-grid--4, .nd-grid--3, .nd-grid--2 { grid-template-columns: 1fr; }
  .nd-main { padding: var(--nd-space-4) var(--nd-space-3); }
  .nd-brand img { width: 154px; }
}