:root   {
  --primary: #3498db;
  --secondary: #2980b9;
  --success: #2ecc71;
  --danger: #e74c3c;
  --warning: #f39c12;
  --info: #3498db;
  --light: #ecf0f1;
  --dark: #2c3e50;
  --sidebar-width: 250px;
  --header-height: 60px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  background-color: #f5f7fa;
  color: #333;
}

.hidden {
  display: none !important;
}

/* Database Connection Messages */
.db-connection-error, .db-connection-success {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
}

.db-connection-message {
  background-color: white;
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  width: 80%;
  max-width: 500px;
  text-align: center;
}

.db-connection-error .db-connection-message h3 {
  color: var(--danger);
  margin-bottom: 15px;
}

.db-connection-success .db-connection-message h3 {
  color: var(--success);
  margin-bottom: 15px;
}

.db-connection-message p {
  margin-bottom: 20px;
  line-height: 1.5;
}

.db-connection-message button {
  background-color: var(--primary);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
  transition: background-color 0.3s;
}

.db-connection-message button:hover {
  background-color: var(--secondary);
}

/* Login Page */
.login-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #3498db, #2c3e50);
}

.login-form {
  background: white;
  padding: 40px;
  border-radius: 8px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  width: 400px;
}

.login-form h1 {
  text-align: center;
  margin-bottom: 30px;
  color: var(--dark);
}

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

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
}

.form-group input {
  width: 100%;
  padding: 10px 15px;
  border: 1px solid #ddd;
  border-radius: 4px;
  font-size: 16px;
}

button {
  background-color: var(--primary);
  color: white;
  border: none;
  padding: 12px 20px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
  width: 100%;
  transition: background-color 0.3s;
}

button:hover {
  background-color: var(--secondary);
}

button:disabled {
  background-color: #ccc;
  cursor: not-allowed;
}

/* Error messages */
.message {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 15px 20px;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 9999;
  animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

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

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

.message-info {
  background-color: var(--info);
  color: white;
}

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

/* Main App Layout */
#main-app {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
#sidebar {
  width: var(--sidebar-width);
  background-color: var(--dark);
  color: white;
  height: 100vh;
  position: fixed;
  transition: all 0.3s;
}

.sidebar-header {
  padding: 20px;
  background: rgba(0, 0, 0, 0.1);
}

.sidebar-menu {
  list-style: none;
  padding: 0;
}

.sidebar-menu li {
  padding: 15px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  cursor: pointer;
  transition: background-color 0.3s;
  display: flex;
  align-items: center;
}

.sidebar-menu li:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.sidebar-menu li.active {
  background-color: var(--primary);
}

.icon {
  margin-right: 10px;
}

/* Content Area */
#content {
  flex: 1;
  margin-left: var(--sidebar-width);
  transition: all 0.3s;
}

/* Header */
header {
  height: var(--header-height);
  background-color: white;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
  position: sticky;
  top: 0;
  z-index: 10;
}

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

#toggle-sidebar {
  background: transparent;
  border: none;
  font-size: 24px;
  color: var(--dark);
  margin-right: 15px;
  cursor: pointer;
  width: auto;
  padding: 0;
}

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

.date-picker {
  display: flex;
  align-items: center;
  margin-right: 20px;
}

.date-picker input {
  padding: 8px;
  border: 1px solid #ddd;
  border-radius: 4px;
  margin: 0 5px;
}

.date-picker button {
  width: auto;
  padding: 8px 15px;
}

.user-info {
  display: flex;
  align-items: center;
}

/* Main Content */
#main-content {
  padding: 20px;
}

/* Dashboard */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 20px;
}

.stat-card {
  background-color: white;
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.stat-value {
  font-size: 24px;
  font-weight: bold;
  margin: 10px 0;
}

.chart-container {
  background-color: white;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.chart-body {
  width: 100%;
  height: 350px;
}

/* Tables */
.card {
  background-color: white;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

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

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

th, td {
  padding: 12px 15px;
  text-align: left;
  border-bottom: 1px solid #ddd;
}

th {
  background-color: #f8f9fa;
  font-weight: 600;
}

tr:hover {
  background-color: #f5f7fa;
}

/* Forms */
.form-container {
  max-width: 800px;
  margin: 0 auto;
}

.form-row {
  display: flex;
  margin-bottom: 15px;
}

.form-row > div {
  flex: 1;
  margin-right: 15px;
}

.form-row > div:last-child {
  margin-right: 0;
}

textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  resize: vertical;
}

select {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 4px;
  background-color: white;
}

.button-group {
  display: flex;
  justify-content: flex-end;
  margin-top: 20px;
}

.button-group button {
  margin-left: 10px;
  width: auto;
}

/* Utility classes */
.text-right {
  text-align: right;
}

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

.text-success {
  color: var(--success);
}

.text-danger {
  color: var(--danger);
}

.text-warning {
  color: var(--warning);
}

.badge {
  display: inline-block;
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
}

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

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

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

.badge-info {
  background-color: var(--info);
  color: white;
}

.mt-10 {
  margin-top: 10px;
}

.mb-10 {
  margin-bottom: 10px;
}

.ml-10 {
  margin-left: 10px;
}

.truncate-text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 250px;
  display: inline-block;
}

/* Modals */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
  background-color: white;
  margin: 50px auto;
  padding: 0;
  border-radius: 8px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  width: 80%;
  max-width: 800px;
  animation: modalFadeIn 0.3s;
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    transform: translateY(-50px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-header {
  padding: 15px 20px;
  border-bottom: 1px solid #e9ecef;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  margin: 0;
}

.modal-body {
  padding: 20px;
}

.close {
  color: #aaa;
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
}

.close:hover {
  color: var(--dark);
}

/* Notifications */
.notification {
  position: fixed;
  bottom: 20px;
  right: 20px;
  padding: 15px 20px;
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 9999;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.3s, transform 0.3s;
}

.notification.show {
  opacity: 1;
  transform: translateY(0);
}

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

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

.notification-info {
  background-color: var(--info);
  color: white;
}

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

/* Responsive */
@media (max-width: 768px) {
  .dashboard-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .form-row {
    flex-direction: column;
  }
  
  .form-row > div {
    margin-right: 0;
    margin-bottom: 15px;
  }
  
  #sidebar {
    width: 0;
    padding: 0;
  }
  
  #content {
    margin-left: 0;
  }
  
  #sidebar.active {
    width: var(--sidebar-width);
  }
  
  #content.sidebar-active {
    margin-left: var(--sidebar-width);
  }
  
  .modal-content {
    width: 95%;
  }
}

@media (max-width: 480px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
  
  .date-picker {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .date-picker input, .date-picker button {
    margin: 5px 0;
  }
}