/**
 * NextGenDev Project Management System
 * Design System & Main Stylesheet (Pure CSS3)
 */

:root {
  /* Color Palette - Slate & Indigo Enterprise Theme */
  --primary-50: #eef2ff;
  --primary-100: #e0e7ff;
  --primary-200: #c7d2fe;
  --primary-300: #a5b4fc;
  --primary-400: #818cf8;
  --primary-500: #6366f1;
  --primary-600: #4f46e5;
  --primary-700: #4338ca;
  --primary-800: #3730a3;
  --primary-900: #312e81;

  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;

  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;
  --success-text: #065f46;
  --success-solid: #10b981;

  --warning-bg: #fffbeb;
  --warning-border: #fde68a;
  --warning-text: #92400e;
  --warning-solid: #f59e0b;

  --danger-bg: #fef2f2;
  --danger-border: #fecaca;
  --danger-text: #991b1b;
  --danger-solid: #ef4444;

  --info-bg: #eff6ff;
  --info-border: #bfdbfe;
  --info-text: #1e40af;
  --info-solid: #3b82f6;

  --purple-bg: #f5f3ff;
  --purple-border: #ddd6fe;
  --purple-text: #5b21b6;
  --purple-solid: #8b5cf6;

  /* Surfaces & Shadows */
  --bg-body: #f8fafc;
  --bg-surface: #ffffff;
  --bg-sidebar: #0f172a;
  --bg-sidebar-hover: #1e293b;
  --border-color: #e2e8f0;
  --border-color-dark: #334155;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-subtle: #94a3b8;

  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

  /* Radius & Transitions */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --sidebar-width: 250px;
}

/* Base Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  font-family: var(--font-family);
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-main);
  background-color: var(--bg-body);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary-600);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--primary-700);
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

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

/* Sidebar Navigation */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-sidebar);
  color: #f8fafc;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 100;
  transition: transform var(--transition-normal);
}

.sidebar-header {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--border-color-dark);
}

.sidebar-brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary-500), var(--primary-700));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 18px;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
}

.sidebar-brand-text {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.025em;
  color: #ffffff;
}

.sidebar-brand-sub {
  font-size: 11px;
  color: var(--slate-400);
  display: block;
  font-weight: 400;
}

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

.nav-section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--slate-500);
  padding: 12px 12px 6px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  color: var(--slate-300);
  border-radius: var(--radius-md);
  font-size: 13.5px;
  font-weight: 500;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.nav-item:hover {
  background-color: var(--bg-sidebar-hover);
  color: #ffffff;
}

.nav-item.active {
  background-color: var(--primary-600);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.4);
}

.nav-item svg {
  width: 18px;
  height: 18px;
  stroke-width: 2;
  flex-shrink: 0;
}

.sidebar-footer {
  padding: 16px;
  border-top: 1px solid var(--border-color-dark);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background-color: rgba(15, 23, 42, 0.6);
}

.user-profile-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  flex: 1;
}

.user-avatar {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, #4f46e5, #06b6d4);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 13px;
  flex-shrink: 0;
}

.user-meta {
  min-width: 0;
  flex: 1;
}

.user-meta-name {
  font-size: 13px;
  font-weight: 600;
  color: #ffffff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-meta-role {
  font-size: 11px;
  color: var(--slate-400);
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.btn-logout {
  background: transparent;
  border: none;
  color: var(--slate-400);
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

.btn-logout:hover {
  background-color: var(--slate-800);
  color: var(--danger-solid);
}

/* Main Content Area */
.main-wrapper {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-width: 0;
}

.top-bar {
  height: 64px;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 90;
}

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

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--slate-600);
  padding: 6px;
  cursor: pointer;
  border-radius: var(--radius-sm);
}

.breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--slate-500);
}

.breadcrumbs a {
  color: var(--slate-600);
}
.breadcrumbs a:hover {
  color: var(--primary-600);
}
.breadcrumbs-separator {
  color: var(--slate-400);
}
.breadcrumbs-current {
  color: var(--slate-900);
  font-weight: 600;
}

.top-bar-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

.content-container {
  padding: 28px;
  flex: 1;
  max-width: 1440px;
  width: 100%;
  margin: 0 auto;
}

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

.page-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--slate-900);
  letter-spacing: -0.02em;
}

.page-description {
  color: var(--text-muted);
  font-size: 13.5px;
  margin-top: 4px;
}

.page-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  font-size: 13.5px;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn svg {
  width: 16px;
  height: 16px;
  stroke-width: 2;
  flex-shrink: 0;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background-color: var(--primary-600);
  color: white;
}
.btn-primary:hover:not(:disabled) {
  background-color: var(--primary-700);
  box-shadow: var(--shadow-sm);
}

.btn-secondary {
  background-color: white;
  color: var(--slate-700);
  border-color: var(--slate-300);
}
.btn-secondary:hover:not(:disabled) {
  background-color: var(--slate-50);
  border-color: var(--slate-400);
  color: var(--slate-900);
}

.btn-danger {
  background-color: var(--danger-solid);
  color: white;
}
.btn-danger:hover:not(:disabled) {
  background-color: #dc2626;
  box-shadow: var(--shadow-sm);
}

.btn-ghost {
  background: transparent;
  color: var(--slate-600);
  border-color: transparent;
}
.btn-ghost:hover:not(:disabled) {
  background-color: var(--slate-100);
  color: var(--slate-900);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12.5px;
  border-radius: var(--radius-sm);
}

.btn-icon {
  padding: 8px;
  border-radius: var(--radius-md);
  color: var(--slate-600);
  border: 1px solid var(--border-color);
  background: white;
}
.btn-icon:hover {
  background: var(--slate-50);
  color: var(--slate-900);
}

/* Cards */
.card {
  background-color: var(--bg-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--transition-normal);
  overflow: hidden;
}

.card:hover {
  box-shadow: var(--shadow-sm);
}

.card-header {
  padding: 18px 22px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--slate-900);
}

.card-subtitle {
  font-size: 12px;
  color: var(--text-muted);
}

.card-body {
  padding: 22px;
}

.card-footer {
  padding: 14px 22px;
  border-top: 1px solid var(--border-color);
  background-color: var(--slate-50);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Summary Stat Cards Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin-bottom: 28px;
}

.stat-card {
  background-color: var(--bg-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: var(--shadow-xs);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.stat-icon svg {
  width: 24px;
  height: 24px;
}

.stat-icon.primary { background-color: var(--primary-100); color: var(--primary-600); }
.stat-icon.success { background-color: var(--success-bg); color: var(--success-solid); }
.stat-icon.warning { background-color: var(--warning-bg); color: var(--warning-solid); }
.stat-icon.danger { background-color: var(--danger-bg); color: var(--danger-solid); }
.stat-icon.purple { background-color: var(--purple-bg); color: var(--purple-solid); }

.stat-info {
  min-width: 0;
}

.stat-label {
  font-size: 12.5px;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

.stat-value {
  font-size: 26px;
  font-weight: 700;
  color: var(--slate-900);
  line-height: 1.2;
  margin-top: 2px;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 9px;
  border-radius: var(--radius-full);
  font-size: 11.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: currentColor;
}

.badge-success { background-color: var(--success-bg); color: var(--success-text); border: 1px solid var(--success-border); }
.badge-warning { background-color: var(--warning-bg); color: var(--warning-text); border: 1px solid var(--warning-border); }
.badge-danger { background-color: var(--danger-bg); color: var(--danger-text); border: 1px solid var(--danger-border); }
.badge-info { background-color: var(--info-bg); color: var(--info-text); border: 1px solid var(--info-border); }
.badge-purple { background-color: var(--purple-bg); color: var(--purple-text); border: 1px solid var(--purple-border); }
.badge-neutral { background-color: var(--slate-100); color: var(--slate-700); border: 1px solid var(--slate-200); }

/* Forms */
.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--slate-700);
  margin-bottom: 6px;
}

.form-label .required {
  color: var(--danger-solid);
  margin-left: 2px;
}

.form-control, .form-select {
  width: 100%;
  padding: 9px 12px;
  font-size: 13.5px;
  color: var(--slate-900);
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.form-control:focus, .form-select:focus {
  border-color: var(--primary-500);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}

.form-control:disabled, .form-select:disabled {
  background-color: var(--slate-100);
  cursor: not-allowed;
  opacity: 0.75;
}

textarea.form-control {
  min-height: 85px;
  resize: vertical;
}

.form-help {
  font-size: 11.5px;
  color: var(--text-muted);
  margin-top: 4px;
}

.form-error {
  font-size: 12px;
  color: var(--danger-solid);
  margin-top: 4px;
  display: none;
}

.form-error.visible {
  display: block;
}

.form-row {
  display: flex;
  gap: 16px;
}

.form-row .form-group {
  flex: 1;
}

/* Custom Checkbox and Switch */
.checkbox-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13.5px;
  color: var(--slate-700);
  cursor: pointer;
  user-select: none;
}

.checkbox-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--primary-600);
  cursor: pointer;
}

/* Data Tables */
.table-container {
  width: 100%;
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.table-toolbar {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
}

.search-box {
  position: relative;
  min-width: 240px;
  flex: 1;
  max-width: 360px;
}

.search-box input {
  padding-left: 36px;
}

.search-icon {
  position: absolute;
  left: 11px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--slate-400);
  width: 16px;
  height: 16px;
  pointer-events: none;
}

.table-filters {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
}

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

.data-table th {
  background-color: var(--slate-50);
  padding: 12px 18px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--slate-500);
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.data-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
  color: var(--slate-800);
  font-size: 13.5px;
  vertical-align: middle;
}

.data-table tbody tr {
  transition: background-color var(--transition-fast);
}

.data-table tbody tr:hover {
  background-color: var(--slate-50);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.table-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Pagination */
.pagination-wrapper {
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  flex-wrap: wrap;
  gap: 12px;
}

.pagination-info {
  font-size: 13px;
  color: var(--text-muted);
}

.pagination-controls {
  display: flex;
  align-items: center;
  gap: 6px;
}

.page-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 32px;
  height: 32px;
  padding: 0 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: white;
  color: var(--slate-700);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.page-btn:hover:not(:disabled) {
  background-color: var(--slate-100);
  border-color: var(--slate-300);
}

.page-btn.active {
  background-color: var(--primary-600);
  border-color: var(--primary-600);
  color: white;
}

.page-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Modals */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.modal-backdrop.active {
  display: flex;
  opacity: 1;
}

.modal-container {
  background-color: #ffffff;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateY(12px) scale(0.98);
  transition: transform var(--transition-normal);
}

.modal-backdrop.active .modal-container {
  transform: translateY(0) scale(1);
}

.modal-container.modal-lg {
  max-width: 800px;
}

.modal-container.modal-xl {
  max-width: 1040px;
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--slate-900);
}

.modal-close {
  background: none;
  border: none;
  color: var(--slate-400);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
}
.modal-close:hover {
  color: var(--slate-700);
  background-color: var(--slate-100);
}

.modal-body {
  padding: 24px;
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
  background-color: var(--slate-50);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
}

/* Toast Notification Container */
.toast-container {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  min-width: 320px;
  max-width: 420px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  background: white;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: flex-start;
  gap: 12px;
  border-left: 4px solid var(--primary-600);
  transform: translateX(120%);
  transition: transform 280ms cubic-bezier(0.16, 1, 0.3, 1), opacity 280ms ease;
  opacity: 0;
}

.toast.show {
  transform: translateX(0);
  opacity: 1;
}

.toast-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 1px;
}

.toast-content {
  flex: 1;
}

.toast-title {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--slate-900);
}

.toast-message {
  font-size: 12.5px;
  color: var(--text-muted);
  margin-top: 2px;
}

.toast-close {
  background: none;
  border: none;
  color: var(--slate-400);
  cursor: pointer;
  padding: 2px;
}
.toast-close:hover {
  color: var(--slate-700);
}

.toast.toast-success { border-left-color: var(--success-solid); }
.toast.toast-success .toast-icon { color: var(--success-solid); }
.toast.toast-error { border-left-color: var(--danger-solid); }
.toast.toast-error .toast-icon { color: var(--danger-solid); }
.toast.toast-warning { border-left-color: var(--warning-solid); }
.toast.toast-warning .toast-icon { color: var(--warning-solid); }
.toast.toast-info { border-left-color: var(--info-solid); }
.toast.toast-info .toast-icon { color: var(--info-solid); }

/* Spinners & Loading States */
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: currentColor;
  animation: spin 0.7s linear infinite;
  display: inline-block;
}

.spinner-primary {
  border-color: var(--slate-200);
  border-top-color: var(--primary-600);
}

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

.empty-state {
  text-align: center;
  padding: 48px 24px;
}

.empty-state-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background-color: var(--slate-100);
  color: var(--slate-400);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.empty-state-icon svg {
  width: 32px;
  height: 32px;
}

.empty-state-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--slate-800);
}

.empty-state-desc {
  font-size: 13px;
  color: var(--text-muted);
  max-width: 400px;
  margin: 6px auto 16px;
}

/* Alert Boxes */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 13.5px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
}

.alert-danger {
  background-color: var(--danger-bg);
  border: 1px solid var(--danger-border);
  color: var(--danger-text);
}

.alert-warning {
  background-color: var(--warning-bg);
  border: 1px solid var(--warning-border);
  color: var(--warning-text);
}

.alert-success {
  background-color: var(--success-bg);
  border: 1px solid var(--success-border);
  color: var(--success-text);
}

.alert-info {
  background-color: var(--info-bg);
  border: 1px solid var(--info-border);
  color: var(--info-text);
}

/* Mobile backdrop */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.5);
  z-index: 95;
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .sidebar-overlay.active {
    display: block;
  }
  .main-wrapper {
    margin-left: 0;
  }
  .mobile-menu-toggle {
    display: flex;
  }
}

@media (max-width: 640px) {
  .content-container {
    padding: 16px;
  }
  .top-bar {
    padding: 0 16px;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
  .page-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .page-actions {
    width: 100%;
  }
  .page-actions .btn {
    flex: 1;
  }
  .table-toolbar {
    flex-direction: column;
    align-items: stretch;
  }
  .search-box {
    max-width: none;
  }
}