:root {
  --primary-color: #2563eb;
  --secondary-color: #64748b;
  --success-color: #10b981;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;
  --info-color: #3b82f6;

  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-sidebar: #1e293b;
  --bg-hover: #f1f5f9;

  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --text-light: #ffffff;

  --border-color: #e2e8f0;
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

  --sidebar-width: 260px;
  --header-height: 64px;
  --border-radius: 8px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg-secondary);
}

/* Layout */
.layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-sidebar);
  color: var(--text-light);
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  overflow-y: auto;
  z-index: 1000;
  transition: transform 0.3s ease;
}

/* On desktop, sidebar is always visible unless explicitly hidden */
.sidebar.collapsed {
  transform: translateX(-100%);
}

.sidebar-header {
  padding: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-light);
  text-decoration: none;
}

.sidebar-logo i {
  width: 32px;
  height: 32px;
}

.sidebar-menu {
  padding: 20px 0;
}

.menu-section {
  margin-bottom: 24px;
}

.menu-section-title {
  padding: 0 20px 8px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: rgba(255, 255, 255, 0.5);
}

.menu-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: all 0.2s;
}

.menu-item:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-light);
}

.menu-item.active {
  background: rgba(59, 130, 246, 0.15);
  color: var(--text-light);
  border-right: 3px solid var(--primary-color);
}

.menu-item i {
  width: 20px;
  height: 20px;
}

/* Main Content */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  transition: margin-left 0.3s ease;
}

.main-content.expanded {
  margin-left: 0;
}

/* Header */
.header {
  background: var(--bg-primary);
  height: var(--header-height);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--border-radius);
  color: var(--text-primary);
}

.menu-toggle:hover {
  background: var(--bg-hover);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-item {
  position: relative;
}

.icon-button {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--border-radius);
  color: var(--text-secondary);
  position: relative;
  transition: all 0.2s;
}

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

.icon-button .badge {
  position: absolute;
  top: 4px;
  right: 4px;
  background: var(--danger-color);
  color: white;
  font-size: 10px;
  padding: 2px 5px;
  border-radius: 10px;
  min-width: 18px;
  text-align: center;
}

.user-menu {
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  padding: 8px 12px;
  border-radius: var(--border-radius);
  transition: all 0.2s;
}

.user-menu:hover {
  background: var(--bg-hover);
}

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

.user-info {
  display: flex;
  flex-direction: column;
}

.user-name {
  font-weight: 600;
  font-size: 14px;
}

.user-role {
  font-size: 12px;
  color: var(--text-secondary);
}

/* Dropdown */
.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  min-width: 200px;
  display: none;
  z-index: 1000;
}

.dropdown.active .dropdown-menu {
  display: block;
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  color: var(--text-primary);
  text-decoration: none;
  transition: all 0.2s;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  cursor: pointer;
}

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

.dropdown-divider {
  height: 1px;
  background: var(--border-color);
  margin: 8px 0;
}

/* Content Area */
.content {
  padding: 24px;
}

.page-header {
  margin-bottom: 24px;
}

.page-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.page-subtitle {
  color: var(--text-secondary);
}

/* Cards */
.card {
  background: var(--bg-primary);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}

.card-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.card-body {
  padding: 24px;
}

.card-footer {
  padding: 20px 24px;
  border-top: 1px solid var(--border-color);
}

/* Forms */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 14px;
  transition: all 0.2s;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-control:disabled {
  background: var(--bg-secondary);
  cursor: not-allowed;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border: none;
  border-radius: var(--border-radius);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-primary {
  background: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background: #1d4ed8;
}

.btn-secondary {
  background: var(--secondary-color);
  color: white;
}

.btn-secondary:hover {
  background: #475569;
}

.btn-success {
  background: var(--success-color);
  color: white;
}

.btn-danger {
  background: var(--danger-color);
  color: white;
}

.btn-danger:hover {
  background: #dc2626;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-outline:hover {
  background: var(--bg-hover);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
}

/* Tables */
.table-responsive {
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
}

.table th,
.table td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.table th {
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-secondary);
}

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

/* Alerts */
.alert {
  padding: 16px;
  border-radius: var(--border-radius);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.alert-success {
  background: #d1fae5;
  color: #065f46;
  border: 1px solid #6ee7b7;
}

.alert-danger {
  background: #fee2e2;
  color: #991b1b;
  border: 1px solid #fca5a5;
}

.alert-warning {
  background: #fef3c7;
  color: #92400e;
  border: 1px solid #fcd34d;
}

.alert-info {
  background: #dbeafe;
  color: #1e40af;
  border: 1px solid #93c5fd;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 8px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}

.badge-success {
  background: #d1fae5;
  color: #065f46;
}

.badge-danger {
  background: #fee2e2;
  color: #991b1b;
}

.badge-warning {
  background: #fef3c7;
  color: #92400e;
}

.badge-primary {
  background: #dbeafe;
  color: #1e40af;
}

/* Responsive */
@media (max-width: 768px) {
  :root {
    --sidebar-width: 0px;
  }

  .sidebar {
    position: fixed;
    left: -100%;
    width: 260px;
    transition: left 0.3s ease;
  }

  .sidebar.active {
    left: 0;
  }

  .main-content {
    margin-left: 0;
    width: 100%;
    max-width: 100vw;
    overflow-x: hidden;
  }

  .menu-toggle {
    display: block !important;
  }

  body {
    overflow-x: hidden;
  }

  .header {
    padding: 0 12px;
  }

  .content {
    padding: 16px;
  }

  .page-title {
    font-size: 20px;
  }
}

/* Loading */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Utility Classes */
.text-center {
  text-align: center;
}
.text-right {
  text-align: right;
}
.mt-1 {
  margin-top: 8px;
}
.mt-2 {
  margin-top: 16px;
}
.mt-3 {
  margin-top: 24px;
}
.mb-1 {
  margin-bottom: 8px;
}
.mb-2 {
  margin-bottom: 16px;
}
.mb-3 {
  margin-bottom: 24px;
}
.d-flex {
  display: flex;
}
.align-items-center {
  align-items: center;
}
.justify-content-between {
  justify-content: space-between;
}
.gap-1 {
  gap: 8px;
}
.gap-2 {
  gap: 16px;
}
.gap-3 {
  gap: 24px;
}