/* ==========================================
   LAYOUT: Sidebar + Topbar + Main
   ========================================== */

.app-layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  grid-template-rows: var(--topbar-height) 1fr;
  height: 100vh;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  grid-row: 1 / -1;
  overflow-y: auto;
  padding: var(--space-lg) var(--space-md);
}

.sidebar-logo {
  align-items: center;
  display: flex;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 900;
  gap: var(--space-sm);
  letter-spacing: -0.04em;
  margin-bottom: var(--space-xl);
  color: var(--text-primary);
}
.sidebar-logo .dot { color: var(--accent); }

.nav-section { margin-bottom: var(--space-lg); }
.nav-label {
  color: var(--text-muted);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
}

.nav-item {
  align-items: center;
  border: none;
  border-radius: var(--radius-sm);
  background: none;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  font-size: 0.875rem;
  font-weight: 500;
  gap: var(--space-sm);
  padding: 9px 12px;
  text-decoration: none;
  transition: all var(--transition);
  width: 100%;
}
.nav-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.nav-item.active {
  background: var(--accent-dim);
  color: var(--accent);
  font-weight: 600;
}
.nav-item svg { flex-shrink: 0; }

.sidebar-footer {
  margin-top: auto;
  padding-top: var(--space-md);
  border-top: 1px solid var(--border);
}

/* Topbar */
.topbar {
  align-items: center;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: var(--space-md);
  justify-content: space-between;
  padding: 0 var(--space-xl);
}
.topbar-title {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
}
.topbar-actions { align-items: center; display: flex; gap: var(--space-md); }

/* Main content */
.main-content {
  overflow-y: auto;
  padding: var(--space-xl);
}

/* Page header */
.page-header {
  margin-bottom: var(--space-xl);
}
.page-header h1 { font-size: 1.6rem; margin-bottom: var(--space-xs); }
.page-header p { color: var(--text-secondary); font-size: 0.9rem; }

/* Grid layouts */
.grid-2 { display: grid; gap: var(--space-lg); grid-template-columns: repeat(2, 1fr); }
.grid-3 { display: grid; gap: var(--space-lg); grid-template-columns: repeat(3, 1fr); }

/* Chat layout */
.chat-layout {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}
.chat-input-area {
  border-top: 1px solid var(--border);
  padding: var(--space-lg) var(--space-xl);
  background: var(--bg-secondary);
}

/* Onboarding layout (no sidebar, full screen) */
.onboarding-layout {
  align-items: center;
  display: flex;
  height: 100vh;
  justify-content: center;
  padding: var(--space-xl);
}

/* Auth layout */
.auth-layout {
  align-items: center;
  display: flex;
  height: 100vh;
  justify-content: center;
  padding: var(--space-xl);
}
.auth-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  width: 400px;
}
.auth-logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: -0.05em;
  margin-bottom: var(--space-xl);
  text-align: center;
}
.auth-logo .dot { color: var(--accent); }