/* ============================================
   Responsive Styles
   ============================================ */

/* Tablet (640-1024px) */
@media (max-width: 1024px) {
  .sidebar { width: var(--sidebar-collapsed); }
  .sidebar .sidebar-logo-text { display: none; }
  .sidebar .sidebar-section-label { font-size: 0; }
  .sidebar .sidebar-section-label::after { content: '—'; font-size: var(--text-xs); color: var(--slate-600); }
  .sidebar .sidebar-item { justify-content: center; padding: var(--space-2) 0; border-left: none; }
  .sidebar .sidebar-item-text { display: none; }
  .sidebar .sidebar-badge { display: none; }
  .sidebar .sidebar-user-info { display: none; }
  .sidebar .sidebar-toggle { margin: 0 auto; }

  .dashboard-kpis, .kpi-grid { grid-template-columns: repeat(2, 1fr); }
  .dashboard-grid { grid-template-columns: 1fr; }
  .kanban-board { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .contact-info-grid { grid-template-columns: 1fr; }
  .settings-grid { grid-template-columns: 1fr; }
  .settings-sidebar { display: none; }

  .ai-panel.open { width: 320px; }
  .topbar-search { min-width: 160px; }
}

/* Mobile (< 640px) */
@media (max-width: 640px) {
  .sidebar {
    position: fixed;
    left: -280px;
    width: 280px;
    z-index: var(--z-sidebar);
    transition: left var(--transition-normal);
  }
  .sidebar.mobile-open {
    left: 0;
  }
  .sidebar .sidebar-logo-text { display: block; }
  .sidebar .sidebar-section-label { font-size: var(--text-xs); }
  .sidebar .sidebar-section-label::after { content: none; }
  .sidebar .sidebar-item { justify-content: flex-start; padding: var(--space-2) var(--space-5); border-left: 3px solid transparent; }
  .sidebar .sidebar-item-text { display: block; }
  .sidebar .sidebar-badge { display: block; }
  .sidebar .sidebar-user-info { display: block; }

  .mobile-overlay {
    position: fixed; inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: calc(var(--z-sidebar) - 1);
  }

  .topbar { padding: 0 var(--space-3); }
  .topbar-search { display: none; }
  .topbar-breadcrumb { display: none; }

  .content { padding: var(--space-4); }
  .page-header { flex-direction: column; align-items: flex-start; }
  .page-actions { width: 100%; }

  .dashboard-kpis, .kpi-grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-3); }
  .kpi-value { font-size: var(--text-2xl); }

  .calendar-grid { font-size: var(--text-xs); }
  .calendar-day { min-height: 60px; }

  .data-table-wrapper { overflow-x: auto; }

  .ai-panel.open { position: fixed; right: 0; top: 0; width: 100%; z-index: var(--z-modal); }

  .modal { margin: var(--space-4); max-height: calc(100vh - 32px); }

  .week-grid { display: none; }

  /* Bottom nav for mobile */
  .mobile-bottom-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--white);
    border-top: 1px solid var(--border-color);
    z-index: var(--z-topbar);
    padding: var(--space-1) 0;
    padding-bottom: env(safe-area-inset-bottom);
  }
  .mobile-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: var(--space-1) 0;
    color: var(--slate-400);
    font-size: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: color var(--transition-fast);
    background: none;
    border: none;
    font-family: var(--font-body);
  }
  .mobile-nav-item.active { color: var(--navy-700); }
  .mobile-nav-item i { width: 22px; height: 22px; }

  .content { padding-bottom: calc(var(--space-16) + env(safe-area-inset-bottom)); }
}

/* Desktop hidden on mobile */
@media (min-width: 641px) {
  .mobile-bottom-nav { display: none; }
  .mobile-overlay { display: none; }
  .mobile-menu-btn { display: none; }
}

/* Wide screens (> 1440px) */
@media (min-width: 1440px) {
  .dashboard-kpis, .kpi-grid { grid-template-columns: repeat(4, 1fr); }
  .content { padding: var(--space-8); }
}