/* ========================================
   MÜŞTƏRI İDARƏ SİSTEMİ - CSS STYLES
   ======================================== */

/* ==================== CSS VARIABLES ==================== */
:root {
  /* Primary Colors */
  --primary: #4F46E5;
  --primary-dark: #4338CA;
  --primary-light: #6366F1;
  --secondary: #10B981;
  --danger: #EF4444;
  --warning: #F59E0B;
  --info: #3B82F6;

  /* Neutral Colors */
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;

  /* Semantic Colors */
  --positive: #10B981;
  --negative: #EF4444;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);

  /* Font */
  --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* ==================== RESET & BASE ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background-color: var(--gray-50);
  color: var(--gray-800);
  line-height: 1.6;
  min-height: 100vh;
}

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

a:hover {
  text-decoration: underline;
}

button {
  cursor: pointer;
  font-family: inherit;
}

input, select, textarea {
  font-family: inherit;
  font-size: 1rem;
}

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

/* ==================== UTILITIES ==================== */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.grid {
  display: grid;
}

.hidden {
  display: none !important;
}

.text-center {
  text-align: center;
}

.text-right {
  text-align: right;
}

.positive {
  color: var(--positive) !important;
}

.negative {
  color: var(--negative) !important;
}

.warning {
  color: var(--warning) !important;
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

/* ==================== NAVBAR ==================== */
.navbar {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  padding: var(--spacing-md) var(--spacing-xl);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-md);
}

.navbar-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.navbar .logo {
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.navbar-nav {
  display: flex;
  list-style: none;
  gap: var(--spacing-xs);
}

.navbar-nav a {
  color: rgba(255, 255, 255, 0.85);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all 0.2s;
  font-weight: 500;
}

.navbar-nav a:hover,
.navbar-nav a.active {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  text-decoration: none;
}

.navbar .btn-logout {
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: white;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: all 0.2s;
}

.navbar .btn-logout:hover {
  background: rgba(255, 255, 255, 0.25);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: white;
  font-size: 1.5rem;
  padding: var(--spacing-sm);
}

/* ==================== MAIN CONTENT ==================== */
.main-content {
  padding: var(--spacing-xl);
  max-width: 1400px;
  margin: 0 auto;
}

.page-header {
  margin-bottom: var(--spacing-xl);
}

.page-header h1 {
  font-size: 1.75rem;
  color: var(--gray-800);
  margin-bottom: var(--spacing-sm);
}

.page-header p {
  color: var(--gray-500);
}

/* ==================== CARDS ==================== */
.card {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-lg);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--gray-200);
}

.card-header h2 {
  font-size: 1.125rem;
  color: var(--gray-800);
}

/* ==================== STATS GRID ==================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.stat-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  text-align: center;
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.stat-card h3 {
  font-size: 0.875rem;
  color: var(--gray-500);
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
}

.stat-card .amount {
  font-size: 1.75rem;
  font-weight: 700;
}

.stat-card .amount.positive {
  color: var(--positive);
}

.stat-card .amount.negative {
  color: var(--negative);
}

.stat-card .amount.warning {
  color: var(--warning);
}

.stat-card .sub {
  font-size: 0.75rem;
  color: var(--gray-400);
  margin-top: var(--spacing-xs);
}

/* ==================== NOTIFICATIONS ==================== */
.notifications-panel {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
}

.notification {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  cursor: pointer;
  transition: transform 0.2s;
}

.notification:hover {
  transform: translateX(4px);
}

.notification.warning {
  background: #FEF3C7;
  border-left: 4px solid var(--warning);
  color: #92400E;
}

.notification.info {
  background: #DBEAFE;
  border-left: 4px solid var(--info);
  color: #1E40AF;
}

.notification.success {
  background: #D1FAE5;
  border-left: 4px solid var(--positive);
  color: #065F46;
}

.notification.danger {
  background: #FEE2E2;
  border-left: 4px solid var(--danger);
  color: #991B1B;
}

.notification-icon {
  font-size: 1.25rem;
}

.notification-message {
  flex: 1;
  font-weight: 500;
}

/* ==================== BUTTONS ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.875rem;
  border: none;
  transition: all 0.2s;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-secondary {
  background: var(--gray-100);
  color: var(--gray-700);
  border: 1px solid var(--gray-300);
}

.btn-secondary:hover {
  background: var(--gray-200);
}

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

.btn-success:hover {
  background: #059669;
}

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

.btn-danger:hover {
  background: #DC2626;
}

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

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.75rem;
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-md);
}

/* ==================== TOOLBAR ==================== */
.toolbar {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.toolbar .search-input {
  flex: 1;
  min-width: 200px;
  max-width: 300px;
}

/* ==================== FORMS ==================== */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray-700);
  margin-bottom: var(--spacing-xs);
}

.form-control {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  font-size: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-control::placeholder {
  color: var(--gray-400);
}

select.form-control {
  cursor: pointer;
}

textarea.form-control {
  min-height: 100px;
  resize: vertical;
}

.form-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--gray-200);
}

/* ==================== TABLES ==================== */
.table-container {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

.table-responsive {
  overflow-x: auto;
}

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

.data-table th,
.data-table td {
  padding: var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--gray-200);
}

.data-table th {
  background: var(--gray-50);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gray-600);
}

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

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

.table-actions {
  display: flex;
  gap: var(--spacing-xs);
}

/* ==================== STATUS BADGES ==================== */
.status-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: capitalize;
}

.status-badge.active,
.status-badge.paid {
  background: #D1FAE5;
  color: #065F46;
}

.status-badge.passive,
.status-badge.pending {
  background: #FEF3C7;
  color: #92400E;
}

.status-badge.finished,
.status-badge.cancelled {
  background: var(--gray-200);
  color: var(--gray-600);
}

.status-badge.in_progress {
  background: #DBEAFE;
  color: #1E40AF;
}

.status-badge.completed {
  background: #E0E7FF;
  color: #4338CA;
}

.status-badge.unpaid {
  background: #FEE2E2;
  color: #991B1B;
}

/* ==================== TYPE BADGES ==================== */
.type-badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
}

.type-badge.support {
  background: #DBEAFE;
  color: #1E40AF;
}

.type-badge.todo {
  background: #E0E7FF;
  color: #4338CA;
}

.type-badge.custom_income {
  background: #D1FAE5;
  color: #065F46;
}

.type-badge.expense {
  background: #FEE2E2;
  color: #991B1B;
}

/* ==================== MODALS ==================== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  padding: var(--spacing-lg);
}

.modal.active {
  display: flex;
}

.modal-content {
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-content.large {
  max-width: 700px;
}

.modal-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h2 {
  font-size: 1.25rem;
  color: var(--gray-800);
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--gray-400);
  cursor: pointer;
  padding: var(--spacing-xs);
}

.modal-close:hover {
  color: var(--gray-600);
}

.modal-body {
  padding: var(--spacing-lg);
}

.modal-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--gray-200);
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
}

/* ==================== LOGIN PAGE ==================== */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  padding: var(--spacing-lg);
}

.login-card {
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 400px;
  padding: var(--spacing-2xl);
}

.login-card .logo {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.login-card .logo h1 {
  font-size: 1.5rem;
  color: var(--gray-800);
  margin-top: var(--spacing-sm);
}

.login-card .logo-icon {
  font-size: 3rem;
}

.login-form .form-group {
  margin-bottom: var(--spacing-lg);
}

.login-links {
  text-align: center;
  margin-top: var(--spacing-lg);
}

.login-links a {
  color: var(--primary);
  font-size: 0.875rem;
}

.login-links p {
  color: var(--gray-500);
  font-size: 0.875rem;
  margin-top: var(--spacing-sm);
}

/* ==================== KANBAN BOARD ==================== */
.kanban-board {
  display: flex;
  gap: var(--spacing-lg);
  overflow-x: auto;
  padding-bottom: var(--spacing-lg);
}

.kanban-column {
  flex: 0 0 280px;
  background: var(--gray-100);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  min-height: 500px;
}

.column-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--gray-300);
}

.column-header h3 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-700);
}

.column-header .count {
  background: var(--gray-300);
  color: var(--gray-700);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.column-body {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  min-height: 400px;
}

.column-body.drag-over {
  background: var(--gray-200);
  border-radius: var(--radius-md);
}

/* ==================== TODO CARDS ==================== */
.todo-card {
  background: white;
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  cursor: grab;
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.todo-card.dragging {
  opacity: 0.5;
  transform: rotate(3deg);
}

.todo-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: var(--spacing-sm);
}

.todo-header h4 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-800);
  line-height: 1.3;
}

.todo-menu {
  background: none;
  border: none;
  color: var(--gray-400);
  font-size: 1.25rem;
  padding: 0;
  cursor: pointer;
}

.todo-menu:hover {
  color: var(--gray-600);
}

.todo-customer {
  font-size: 0.75rem;
  color: var(--gray-500);
  margin-bottom: var(--spacing-sm);
}

.todo-progress {
  margin-bottom: var(--spacing-sm);
}

.progress-bar {
  height: 6px;
  background: var(--gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: var(--spacing-xs);
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
  border-radius: var(--radius-full);
  transition: width 0.3s;
}

.progress-text {
  font-size: 0.7rem;
  color: var(--gray-500);
}

.todo-amount {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--positive);
  margin-bottom: var(--spacing-sm);
}

.todo-actions {
  display: flex;
  gap: var(--spacing-xs);
}

/* ==================== CUSTOMER DETAIL ==================== */
.customer-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
}

.customer-header h1 {
  font-size: 1.75rem;
  color: var(--gray-800);
}

.customer-info {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.info-card {
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
}

.info-card label {
  font-size: 0.75rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-xs);
  display: block;
}

.info-card p {
  font-size: 1rem;
  color: var(--gray-800);
  font-weight: 500;
}

.balance-panel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.balance-item {
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  box-shadow: var(--shadow-md);
}

.balance-item h3 {
  font-size: 0.75rem;
  color: var(--gray-500);
  margin-bottom: var(--spacing-sm);
}

.balance-item .amount {
  font-size: 1.5rem;
  font-weight: 700;
}

.balance-item.highlighted {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.balance-item.highlighted h3 {
  color: rgba(255, 255, 255, 0.8);
}

.balance-item.highlighted .amount {
  color: white;
}

/* ==================== NOTES SECTION ==================== */
.notes-section {
  background: white;
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
}

.notes-section h2 {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.notes-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.note-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--gray-50);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--primary);
}

.note-date {
  font-size: 0.75rem;
  color: var(--gray-500);
  white-space: nowrap;
}

.note-text {
  flex: 1;
  font-size: 0.875rem;
  color: var(--gray-700);
}

.note-item button {
  background: none;
  border: none;
  color: var(--gray-400);
  cursor: pointer;
  padding: var(--spacing-xs);
}

.note-item button:hover {
  color: var(--danger);
}

/* ==================== CHECKBOX LIST ==================== */
.checkboxes-section {
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--gray-200);
}

.checkboxes-section h3 {
  font-size: 0.875rem;
  color: var(--gray-700);
  margin-bottom: var(--spacing-md);
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.checkbox-item input[type="text"] {
  flex: 1;
}

.checkbox-item button {
  background: none;
  border: none;
  color: var(--gray-400);
  cursor: pointer;
  padding: var(--spacing-xs);
}

.checkbox-item button:hover {
  color: var(--danger);
}

.todo-checkboxes {
  margin-top: var(--spacing-lg);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: var(--gray-50);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-xs);
  cursor: pointer;
  transition: background 0.2s;
}

.checkbox-label:hover {
  background: var(--gray-100);
}

.checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

.checkbox-label span {
  font-size: 0.875rem;
  color: var(--gray-700);
}

.checkbox-label input[type="checkbox"]:checked + span {
  text-decoration: line-through;
  color: var(--gray-400);
}

/* ==================== PAYMENT STATS ==================== */
.payment-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

/* ==================== LOADER ==================== */
.loader-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.9);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 3000;
}

.loader-overlay.active {
  display: flex;
}

.loader {
  width: 50px;
  height: 50px;
  border: 4px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* ==================== TOAST ==================== */
.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  color: white;
  font-weight: 500;
  transform: translateX(120%);
  transition: transform 0.3s;
  z-index: 4000;
  box-shadow: var(--shadow-lg);
}

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

.toast-info {
  background: var(--info);
}

.toast-success {
  background: var(--positive);
}

.toast-warning {
  background: var(--warning);
}

.toast-error {
  background: var(--danger);
}

/* ==================== EMPTY STATE ==================== */
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--gray-500);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

.empty-state h3 {
  font-size: 1.125rem;
  color: var(--gray-600);
  margin-bottom: var(--spacing-sm);
}

.empty-state p {
  font-size: 0.875rem;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 1024px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .payment-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .kanban-column {
    flex: 0 0 250px;
  }
}

@media (max-width: 768px) {
  .navbar-content {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .navbar-nav {
    flex-wrap: wrap;
    justify-content: center;
  }

  .mobile-menu-btn {
    display: block;
  }

  .navbar-nav {
    display: none;
    width: 100%;
    flex-direction: column;
  }

  .navbar-nav.active {
    display: flex;
  }

  .navbar-nav a {
    text-align: center;
    padding: var(--spacing-md);
  }

  .main-content {
    padding: var(--spacing-md);
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }

  .stat-card .amount {
    font-size: 1.25rem;
  }

  .toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .toolbar .search-input {
    max-width: 100%;
  }

  .balance-panel {
    grid-template-columns: repeat(2, 1fr);
  }

  .customer-info {
    grid-template-columns: 1fr;
  }

  .payment-stats {
    grid-template-columns: 1fr;
  }

  .kanban-board {
    padding-bottom: var(--spacing-xl);
  }

  .kanban-column {
    flex: 0 0 85vw;
  }

  .modal-content {
    max-height: 80vh;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .balance-panel {
    grid-template-columns: 1fr;
  }

  .login-card {
    padding: var(--spacing-lg);
  }

  .form-actions {
    flex-direction: column;
  }

  .form-actions .btn {
    width: 100%;
  }

  .table-actions {
    flex-direction: column;
  }
}

/* ==================== SCROLLBAR ==================== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
  background: var(--gray-300);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gray-400);
}

/* ==================== SELECTION ==================== */
::selection {
  background: var(--primary);
  color: white;
}