/* ============================================================
   KOS v5 — App Shell Layout
   Sidebar + Header + Main Content
   ============================================================ */

.app-shell {
  display: flex;
  min-height: 100vh;
}

/* ---------------- Sidebar ---------------- */

.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: linear-gradient(180deg, var(--color-sidebar-bg) 0%, #0c0e0c 100%);
  color: var(--color-sidebar-text);
  display: flex;
  flex-direction: column;
  padding: var(--space-4) var(--space-3);
  border-right: 1px solid var(--color-sidebar-border);
}

.sidebar-header {
  padding: var(--space-2) var(--space-2) var(--space-5);
  border-bottom: 1px solid var(--color-sidebar-border);
  margin-bottom: var(--space-4);
}

.sidebar-logo-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.sidebar-logo-mark {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--accent-teal), var(--accent-blue));
  color: #fff;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  box-shadow: var(--shadow-md);
}

.sidebar-logo {
  display: block;
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.02em;
  color: #ffffff;
}

.sidebar-logo-subtitle {
  display: block;
  margin-top: 1px;
  font-size: 10px;
  color: var(--color-sidebar-text-muted);
  font-weight: var(--font-weight-normal);
  letter-spacing: 0.02em;
}

.sidebar-nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-section-label {
  font-size: 10px;
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-label);
  text-transform: uppercase;
  color: var(--color-sidebar-text-muted);
  padding: var(--space-4) var(--space-3) var(--space-1);
}

.nav-section-label:first-child {
  padding-top: var(--space-1);
}

/* ---------------- Main column ---------------- */

.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.app-header {
  height: var(--header-height);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-5);
  background: var(--surface-raised);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 1px 0 rgba(10, 10, 8, 0.02);
}

.app-content {
  flex: 1;
  padding: var(--space-5);
  overflow-y: auto;
  background: var(--surface-base);
}

/* ---------------- Dashboard grid ---------------- */

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

.dashboard-command-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  margin-bottom: var(--space-4);
  background: var(--color-sidebar-bg);
  border-radius: var(--radius-lg);
  color: #ffffff;
}

.dashboard-command-greeting {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
}

.dashboard-command-date {
  font-size: var(--font-size-sm);
  color: var(--color-sidebar-text-muted);
  margin-top: 2px;
}

.dashboard-command-clock {
  font-family: var(--font-family-mono);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-medium);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.dashboard-section-label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-label);
  text-transform: uppercase;
  color: var(--color-text-subtle);
  margin: var(--space-5) 0 var(--space-2);
}

.dashboard-section-label:first-of-type {
  margin-top: 0;
}

.dashboard-grid--primary {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.dashboard-grid--secondary {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card--primary {
  min-height: 108px;
}

.card--primary .card-title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-label);
  text-transform: uppercase;
  color: var(--color-text-subtle);
}

.card--primary .dashboard-highlight {
  font-family: var(--font-family-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
  letter-spacing: -0.01em;
}