:root {
  /* spacing (8pt grid) */
  --s1: 4px;
  --s2: 8px;
  --s3: 12px;
  --s4: 16px;
  --s6: 24px;
  --s8: 32px;
  --s12: 48px;
  --s16: 64px;

  /* radius */
  --r2: 8px;
  --r3: 12px;
  --r4: 14px;
  --r5: 16px;

  /* borders */
  --border: rgba(255, 255, 255, 0.06);
  --border-strong: rgba(255, 255, 255, 0.10);

  /* shadows (premium) */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 10px 26px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 18px 42px rgba(0, 0, 0, 0.35);

  /* motion */
  --ease: cubic-bezier(.2, .8, .2, 1);
  --t1: 120ms;
  --t2: 160ms;

  /* typography */
  --h1: 26px;
  --h2: 16px;
  --body: 13px;
  --meta: 12px;
  --kpi: 22px;
}

body {
  font-size: var(--body);
  line-height: 1.42;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

.appBackground {
  min-height: 100vh;
  background:
    radial-gradient(1200px 600px at 50% 0%, rgba(120, 140, 255, 0.12), transparent 60%),
    radial-gradient(900px 500px at 10% 20%, rgba(0, 255, 200, 0.06), transparent 55%),
    radial-gradient(900px 500px at 90% 30%, rgba(255, 120, 200, 0.05), transparent 55%),
    #070A14;
}

.mainContainer,
.wrap {
  max-width: 1600px;
  margin: 0 auto;
  padding: var(--s8);
}

.section {
  margin-top: var(--s8);
}

.section + .section {
  margin-top: var(--s8);
}

/* Typography hierarchy */
.h1,
.app-title {
  font-size: var(--h1);
  font-weight: 650;
  letter-spacing: -0.01em;
}

.h2,
.activity-heading,
h2,
h3 {
  font-size: var(--h2);
  font-weight: 600;
}

.body,
p,
input,
textarea,
select,
button {
  font-size: var(--body);
  opacity: 0.92;
}

.meta,
.muted,
.metric-sub,
.run-meta,
.scraper-meta,
.sidebar-note {
  font-size: var(--meta);
  opacity: 0.65;
}

.kpi,
.metric-value,
.health-item .num,
.num {
  font-size: var(--kpi);
  font-weight: 650;
  letter-spacing: -0.01em;
}

/* Layout rhythm improvements */
.topbar {
  margin-top: var(--s2);
  margin-bottom: var(--s6);
}

#system-status-bar,
#quick-actions,
#activity-feed,
#health-view,
#projects {
  margin-top: var(--s8);
}

#quick-actions {
  padding-top: var(--s4);
  padding-bottom: var(--s4);
}

/* Sticky SaaS topbar */
.topbar {
  position: sticky;
  top: var(--s4);
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s6);

  padding: 14px 16px;
  border-radius: var(--r4);
  border: 1px solid var(--border);
  background: rgba(10, 14, 30, 0.65);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);

  box-shadow: var(--shadow-sm), var(--shadow-md);
}

.topbarActions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

/* Sidebar polish */
.sidebar {
  padding: var(--s6) var(--s4);
}

.sidebarItem,
.sidebar-link {
  height: 40px;
  border-radius: var(--r2);
  padding: 0 var(--s3);
  transition: transform var(--t1) var(--ease), background var(--t1) var(--ease);
  transform: translateZ(0);
}

.sidebarItem:hover,
.sidebar-link:hover {
  transform: translateX(2px);
  background: rgba(255, 255, 255, 0.04);
}

.sidebarItemActive,
.sidebar-link.active {
  background: rgba(255, 255, 255, 0.08);
}

/* Buttons */
.button,
button,
.btn-primary,
.btn-ghost,
.btn-danger,
.btn-warn {
  height: 34px;
  min-height: 34px;
  border-radius: var(--r2);
  padding: 0 var(--s4);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  transition:
    transform var(--t1) var(--ease),
    background var(--t1) var(--ease),
    border-color var(--t1) var(--ease);
  transform: translateZ(0);
}

.button:hover,
button:hover,
.btn-primary:hover,
.btn-ghost:hover,
.btn-danger:hover,
.btn-warn:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border-strong);
}

.button:active,
button:active,
.btn-primary:active,
.btn-ghost:active,
.btn-danger:active,
.btn-warn:active {
  transform: translateY(0);
}

.chip,
.topbar .row button {
  height: 32px;
  min-height: 32px;
  padding: 0 12px;
  border-radius: 999px;
}

.chipBtn {
  height: 32px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(255, 255, 255, 0.05);
  transition: transform 120ms cubic-bezier(.2, .8, .2, 1), background 120ms, border-color 120ms;
}

.chipBtn:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.10);
}

.chipBtn:active {
  transform: translateY(0);
}

/* Card system */
.card {
  border-radius: var(--r4);
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.02));
  box-shadow: var(--shadow-sm), var(--shadow-md);
  transition:
    transform var(--t2) var(--ease),
    box-shadow var(--t2) var(--ease),
    border-color var(--t2) var(--ease);
  will-change: transform;
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm), var(--shadow-lg);
}

.cardStats {
  padding: 18px;
}

.cardModule {
  padding: 24px;
}

/* Structured grids */
.statsGrid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--s6);
}

.modulesGrid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--s6);
}

@media (max-width: 1200px) {
  .statsGrid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .modulesGrid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .statsGrid,
  .modulesGrid {
    grid-template-columns: 1fr;
  }

  .mainContainer,
  .wrap {
    padding: var(--s4);
  }
}

/* Status badges */
.status-badge.healthy,
.status-badge.ok {
  box-shadow: 0 0 8px rgba(45, 201, 137, 0.4);
}

.status-badge.warning,
.status-badge.warn {
  box-shadow: 0 0 8px rgba(229, 173, 65, 0.4);
}

.status-badge.error,
.status-badge.critical,
.status-badge.err {
  box-shadow: 0 0 8px rgba(236, 109, 127, 0.4);
}

.status-badge.info {
  box-shadow: 0 0 8px rgba(106, 124, 255, 0.4);
}

/* Motion and transitions */
.modal-backdrop {
  animation: premiumFade var(--t2) var(--ease);
}

.modal {
  animation: premiumScale var(--t2) var(--ease);
}

@keyframes premiumFade {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes premiumScale {
  from { opacity: 0; transform: translateY(6px) scale(0.985); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.view-fade {
  animation: viewFade var(--t2) var(--ease);
}

@keyframes viewFade {
  from { opacity: 0; transform: translateY(3px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Skeleton shimmer */
.skeleton {
  border-radius: var(--r2);
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.04),
    rgba(255, 255, 255, 0.08),
    rgba(255, 255, 255, 0.04)
  );
  background-size: 200% 100%;
  animation: shimmer 1.2s infinite;
}

@keyframes shimmer {
  0% { background-position: 180% 0; }
  100% { background-position: -180% 0; }
}

/* GPU acceleration for animated elements */
.card,
.button,
button,
.sidebarItem,
.sidebar-link,
.modal,
.activity-card,
.metric-card,
.project {
  transform: translateZ(0);
}