/* Professional Business SaaS CRM CSS (HubSpot / Stripe / Linear / GitHub Inspired) */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --bg-body: #f8fafc;
  --bg-surface: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-hover: #f8fafc;
  
  --border-color: #e2e8f0;
  --border-focus: #2563eb;
  
  --text-primary: #111827;
  --text-secondary: #4b5563;
  --text-muted: #6b7280;
  --text-inverse: #ffffff;

  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #eff6ff;
  
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-danger: #ef4444;
  
  --sidebar-width: 250px;
  --sidebar-collapsed-width: 70px;
  --navbar-height: 64px;
  
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  --shadow-xs: 0 1px 2px 0 rgba(16, 24, 40, 0.04);
  --shadow-sm: 0 1px 3px 0 rgba(16, 24, 40, 0.08), 0 1px 2px -1px rgba(16, 24, 40, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(16, 24, 40, 0.08), 0 2px 4px -2px rgba(16, 24, 40, 0.04);
  --shadow-lg: 0 10px 25px -5px rgba(16, 24, 40, 0.1), 0 8px 10px -6px rgba(16, 24, 40, 0.04);
  
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-body: #0b0f19;
  --bg-surface: #111827;
  --bg-subtle: #1f2937;
  --bg-hover: #1f2937;
  
  --border-color: #1f2937;
  --border-focus: #3b82f6;
  
  --text-primary: #f9fafb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  --color-primary-light: rgba(37, 99, 235, 0.15);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-body);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.5;
  font-size: 0.9rem;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--color-primary-hover);
}

/* App Wrapper */
.app-wrapper {
  display: flex;
  flex: 1;
  min-height: 100vh;
}

/* Sidebar Layout (Linear/Vercel Style) */
.sidebar {
  width: 260px;
  background-color: #ffffff;
  border-right: 1px solid #e5e7eb;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 50;
  transition: width 200ms cubic-bezier(0.4, 0, 0.2, 1), transform 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar.collapsed {
  width: 72px;
}

.sidebar-header {
  height: 72px;
  padding: 0 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #e5e7eb;
  flex-shrink: 0;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-badge {
  background-color: var(--color-primary);
  color: #ffffff;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.logo-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #111827;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.sidebar-collapse-btn {
  background: none;
  border: 1px solid #e5e7eb;
  color: #6b7280;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 150ms ease;
}

.sidebar-collapse-btn:hover {
  background-color: #f3f4f6;
  color: #111827;
}

.sidebar.collapsed .sidebar-collapse-btn i {
  transform: rotate(180deg);
}

.sidebar.collapsed .logo-title,
.sidebar.collapsed .nav-section-title,
.sidebar.collapsed .nav-label,
.sidebar.collapsed .user-details,
.sidebar.collapsed .user-card-divider,
.sidebar.collapsed .user-card-actions,
.sidebar.collapsed .sidebar-version-bottom {
  display: none !important;
}

/* Sidebar Navigation */
.sidebar-nav {
  padding: 16px 12px;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
  overflow-y: auto;
}

.nav-section-title {
  font-size: 12px;
  font-weight: 700;
  color: #9ca3af;
  letter-spacing: 0.08em;
  padding: 16px 12px 6px 12px;
  text-transform: uppercase;
}

.nav-item-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  min-height: 46px;
  color: #4b5563;
  border-radius: 12px;
  font-weight: 500;
  font-size: 15px;
  transition: all 150ms ease;
  position: relative;
  text-decoration: none;
}

.nav-item-link:hover {
  background-color: #f3f4f6;
  color: #111827;
  text-decoration: none;
}

.nav-item-link.active {
  background-color: #eff6ff;
  color: #2563eb;
  font-weight: 600;
}

.nav-item-link.active i {
  color: #2563eb;
}

.nav-item-link.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 3px;
  background-color: #2563eb;
  border-radius: 0 4px 4px 0;
}

.nav-item-link i {
  font-size: 20px;
  width: 20px;
  text-align: center;
  flex-shrink: 0;
  color: #6b7280;
}

/* Bottom User Card */
.sidebar-user-footer {
  padding: 16px;
  border-top: 1px solid #e5e7eb;
  background-color: #ffffff;
  flex-shrink: 0;
}

.user-account-card {
  background-color: #f9fafb;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.user-card-header {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.user-avatar-large {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: #2563eb;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}

.user-details {
  flex: 1;
  min-width: 0;
  line-height: 1.3;
}

.user-name {
  font-weight: 600;
  font-size: 0.9rem;
  color: #111827;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-email {
  font-size: 0.775rem;
  color: #6b7280;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-card-divider {
  height: 1px;
  background-color: #e5e7eb;
}

.user-card-actions {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.user-action-btn {
  padding: 6px 10px;
  font-size: 0.8rem;
  font-weight: 500;
  color: #374151;
  border-radius: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  transition: background-color 150ms ease;
}

.user-action-btn:hover {
  background-color: #e5e7eb;
  color: #111827;
  text-decoration: none;
}

.user-action-btn.danger {
  color: #dc2626;
}

.user-action-btn.danger:hover {
  background-color: #fee2e2;
  color: #b91c1c;
}

.sidebar-version-bottom {
  font-size: 11px;
  color: #9ca3af;
  text-align: center;
  margin-top: 12px;
}

/* Main Content Layout Shift */
.main-content {
  margin-left: 260px;
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  transition: margin-left 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

.main-content.expanded {
  margin-left: 72px;
}

/* Top Navbar Architecture */
.top-navbar {
  height: 72px;
  background-color: #ffffff;
  border-bottom: 1px solid #e5e7eb;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  position: fixed;
  top: 0;
  right: 0;
  left: 260px;
  z-index: 40;
  transition: left 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

.main-content.expanded .top-navbar {
  left: 72px;
}

.navbar-left {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-shrink: 0;
}

.breadcrumb-container {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: #6b7280;
  white-space: nowrap;
}

.breadcrumb-current {
  color: #111827;
  font-weight: 600;
}

/* Global Search Bar (420px min width) */
.global-search-trigger {
  flex: 0 1 420px;
  min-width: 320px;
  background-color: #f9fafb;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.875rem;
  color: #6b7280;
  cursor: pointer;
  transition: all 150ms ease;
}

.global-search-trigger:hover {
  border-color: #2563eb;
  background-color: #ffffff;
  box-shadow: var(--shadow-xs);
}

.global-search-trigger kbd {
  margin-left: auto;
  background-color: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 6px;
  padding: 2px 6px;
  font-size: 0.75rem;
  font-weight: 600;
  color: #6b7280;
}

.user-nav-group {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

/* Content Container Architecture */
.content-container {
  margin-top: 72px;
  padding: 32px;
  max-width: 1600px;
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  flex: 1;
}

/* Page Header Structure */
.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.page-header-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: #111827;
}

.page-header-sub {
  font-size: 0.875rem;
  color: #6b7280;
  margin-top: 2px;
}

/* Card Surface & Tables */
.card-surface, .table-card {
  background-color: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.04);
  margin-bottom: 24px;
}

.crm-table th {
  background-color: #f9fafb;
  color: #4b5563;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 14px 20px;
  border-bottom: 1px solid #e5e7eb;
}

.crm-table td {
  padding: 16px 20px;
  border-bottom: 1px solid #e5e7eb;
  color: #111827;
  font-size: 0.9rem;
  height: 56px;
}

.global-search-trigger:hover {
  border-color: var(--border-focus);
  background-color: var(--bg-surface);
  box-shadow: var(--shadow-xs);
}

.global-search-trigger kbd {
  margin-left: auto;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.1rem 0.4rem;
  font-size: 0.7rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--text-muted);
}

.menu-toggle-btn {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.menu-toggle-btn:hover {
  background-color: var(--bg-subtle);
  color: var(--text-primary);
}

.user-nav-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.nav-icon-btn {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  transition: all var(--transition-fast);
}

.nav-icon-btn:hover {
  background-color: var(--bg-subtle);
  color: var(--text-primary);
}

.notification-badge {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 8px;
  height: 8px;
  background-color: var(--color-danger);
  border-radius: 50%;
}

/* Dropdown Container */
.nav-dropdown-wrapper {
  position: relative;
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 300px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: none;
  flex-direction: column;
  z-index: 100;
  overflow: hidden;
}

.nav-dropdown-menu.show {
  display: flex;
}

.dropdown-header {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 0.85rem;
}

.mark-all-read {
  font-size: 0.75rem;
  color: var(--color-primary);
}

.dropdown-list {
  display: flex;
  flex-direction: column;
  max-height: 260px;
  overflow-y: auto;
}

.dropdown-item {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  font-size: 0.8rem;
  transition: background-color var(--transition-fast);
}

.dropdown-item:hover {
  background-color: var(--bg-subtle);
}

.dropdown-item-title {
  font-weight: 600;
  color: var(--text-primary);
}

.dropdown-item-sub {
  color: var(--text-muted);
  margin-top: 0.15rem;
}

/* User Avatar Dropdown Button */
.user-avatar-btn {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

.profile-menu {
  width: 200px;
}

.profile-menu-header {
  padding: 0.85rem 1rem;
  background-color: var(--bg-subtle);
  border-bottom: 1px solid var(--border-color);
}

.profile-menu-divider {
  height: 1px;
  background-color: var(--border-color);
}

.profile-menu-item {
  padding: 0.65rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  color: var(--text-primary);
  transition: background-color var(--transition-fast);
}

.profile-menu-item:hover {
  background-color: var(--bg-subtle);
  text-decoration: none;
}

/* Search Modal Card */
.search-modal-card {
  max-width: 540px;
  padding: 0;
  overflow: hidden;
}

.search-input-header {
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.search-input-header input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  font-size: 1rem;
  color: var(--text-primary);
}

.search-modal-close {
  background: none;
  border: none;
  font-size: 1.4rem;
  color: var(--text-muted);
  cursor: pointer;
}

.search-results-list {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-height: 320px;
  overflow-y: auto;
}

.search-category-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.search-result-item {
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-primary);
  transition: background-color var(--transition-fast);
}

.search-result-item:hover {
  background-color: var(--bg-subtle);
  text-decoration: none;
}

.search-result-title {
  font-weight: 600;
  font-size: 0.875rem;
}

.search-result-sub {
  font-size: 0.775rem;
  color: var(--text-muted);
}

.user-avatar-badge {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.9rem;
  border: 1px solid var(--border-color);
}

/* Role Badges */
.badge-role {
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}
.badge-admin { background-color: #f3e8ff; color: #6b21a8; border: 1px solid #e9d5ff; }
.badge-member { background-color: #e0f2fe; color: #0369a1; border: 1px solid #bae6fd; }

/* Page Content Container */
.content-container {
  padding: 1.75rem 2rem;
  flex: 1;
}

/* Cards & Surfaces */
.card-surface {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--transition-fast);
}
.card-surface:hover {
  box-shadow: var(--shadow-sm);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.75rem;
}

.stat-card {
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.stat-card-title {
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.stat-card-value {
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.03em;
}

/* Status Badges - Specification Palette */
.status-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.65rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1;
}
.status-new { background-color: #dbeafe; color: #1e40af; }
.status-contacted { background-color: #f3e8ff; color: #6b21a8; }
.status-qualified { background-color: #cff4fc; color: #055160; }
.status-proposalsent { background-color: #ffedd5; color: #9a3412; }
.status-negotiation { background-color: #fef9c3; color: #854d0e; }
.status-won { background-color: #dcfce7; color: #166534; }
.status-lost { background-color: #fee2e2; color: #991b1b; }

/* Table Styles */
.table-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  overflow: hidden;
  margin-bottom: 1.75rem;
}

.table-header-bar {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  background-color: var(--bg-surface);
}

.crm-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.crm-table th {
  position: sticky;
  top: 0;
  background-color: var(--bg-subtle);
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  z-index: 10;
}

.crm-table td {
  padding: 0.9rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 0.875rem;
}

.crm-table tbody tr:nth-child(even) {
  background-color: rgba(248, 250, 252, 0.6);
}

.crm-table tbody tr:hover {
  background-color: var(--bg-subtle);
}

/* Forms & Inputs */
.form-group {
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: 0.65rem 0.85rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Action Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.875rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
}
.btn-primary:hover {
  background-color: var(--color-primary-hover);
  color: #ffffff;
  text-decoration: none;
}

.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-primary);
  border-color: var(--border-color);
}
.btn-secondary:hover {
  background-color: var(--bg-subtle);
  text-decoration: none;
}

.btn-danger {
  background-color: var(--color-danger);
  color: #ffffff;
}
.btn-danger:hover {
  background-color: #b91c1c;
  text-decoration: none;
}

.btn-ghost {
  background: none;
  color: var(--text-secondary);
}
.btn-ghost:hover {
  background-color: var(--bg-subtle);
  color: var(--text-primary);
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(2px);
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 520px;
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 150;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.25rem;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.875rem;
  color: var(--text-primary);
  min-width: 280px;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 3.5rem 1.5rem;
}
.empty-state-icon {
  width: 56px;
  height: 56px;
  background-color: var(--bg-subtle);
  color: var(--text-muted);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

/* Footer */
.app-footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 1rem 2rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.app-footer a {
  font-weight: 600;
  color: var(--color-primary);
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.mobile-open {
    transform: translateX(0);
  }
  .main-content {
    margin-left: 0;
  }
  .content-container {
    padding: 1.25rem 1rem;
  }
}