/* ============================================
   Layout — Header, Grid, Responsive
   ============================================ */

/* Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 var(--space-lg);
  background: var(--color-bg-surface);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(12px);
}

.app-header__title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-lg);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.app-header__title svg {
  width: 24px;
  height: 24px;
  fill: var(--color-accent);
}

.app-header__status {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

/* Main content area */
.app-main {
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: var(--space-lg);
}

/* Dashboard grid */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(var(--panel-min-width), 1fr));
  gap: var(--space-lg);
}

/* Full-width panels (file browser, media gallery) */
.dashboard-grid .panel--full {
  grid-column: 1 / -1;
}

/* Welcome banner sits above the grid */
.welcome-banner {
  grid-column: 1 / -1;
}

/* Responsive */
@media (max-width: 768px) {
  .app-header {
    padding: 0 var(--space-md);
  }

  .app-main {
    padding: var(--space-md);
  }

  .dashboard-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
}

@media (max-width: 480px) {
  :root {
    --panel-min-width: 100%;
  }

  .app-header__title {
    font-size: var(--font-size-base);
  }
}