body {
  font-family: var(--font-base);
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
}

/* Serif headings — editorial feel */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: normal;
  line-height: 1.2;
}

#app {
  display: flex;
  height: 100vh;
  overflow: hidden;
  position: relative;
}

/* ── Sidebar ────────────────────────────── */
#sidebar {
  width: var(--sidebar-width);
  height: 100vh;
  flex-shrink: 0;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: width var(--transition-slow), transform var(--transition-slow);
  z-index: 50;
}

#sidebar::-webkit-scrollbar { width: 3px; }
#sidebar::-webkit-scrollbar-track { background: transparent; }
#sidebar::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 2px;
}

/* ── Main content ───────────────────────── */
#content {
  flex: 1;
  height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--bg-primary);
  min-width: 0;
}

#content::-webkit-scrollbar { width: 5px; }
#content::-webkit-scrollbar-track { background: var(--bg-secondary); }
#content::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 2px;
}

/* Sidebar collapsed */
#app.sidebar-collapsed #sidebar { width: 0; }

/* Mobile backdrop */
#sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.65);
  z-index: 40;
}
#sidebar-backdrop.visible { display: block; }

/* ── Loading ────────────────────────────── */
#loading {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 200px;
  gap: var(--space-3);
  color: var(--text-muted);
  font-size: var(--text-sm);
}
#loading.hidden { display: none; }

.loading-spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-light);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Page content ───────────────────────── */
#page-content { min-height: 100vh; }
#page-content.hidden { display: none; }

/* Centered wrapper for pages */
.page-wrapper {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--space-8) var(--space-6);
}

/* Page header */
.page-header { margin-bottom: var(--space-8); }

.page-header h1 {
  font-size: var(--text-3xl);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  letter-spacing: -0.01em;
}

.page-header .page-subtitle {
  color: var(--text-secondary);
  font-size: var(--text-base);
  font-family: var(--font-base);
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
  font-family: var(--font-base);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.breadcrumb a {
  color: var(--accent);
  transition: color var(--transition);
}
.breadcrumb a:hover { color: var(--accent-hover); }

/* Error page */
.error-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
  gap: var(--space-4);
  padding: var(--space-8);
}
.error-page h1 {
  font-size: 5rem;
  color: var(--text-muted);
  font-family: var(--font-heading);
}
.error-page p { color: var(--text-secondary); }