/* CSS Variables */
:root {
  --navy: #1A1F71;
  --gray: #2E2E2E;
  --brown: #4B3832;
  --light-gray: #f5f5f5;
  --white: #ffffff;
  --accent: #4CAF50;
  --accent-hover: #388E3C;
  --danger: #F44336;
  --warning: #FFC107;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  --border-radius: 8px;
  --transition: all 0.3s ease;
  
  /* Dark Theme Variables */
  --bg-dark: #121212;
  --card-dark: #1E1E1E;
  --text-dark: #E0E0E0;
  --border-dark: #333333;
}

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

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

body {
  font-family: 'Changa', sans-serif;
  background-color: var(--light-gray);
  color: var(--gray);
  line-height: 1.6;
  direction: rtl;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'El Messiri', sans-serif;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

button {
  cursor: pointer;
  font-family: 'Changa', sans-serif;
  border: none;
  background: none;
  transition: var(--transition);
}

input, select, textarea {
  font-family: 'Changa', sans-serif;
  padding: 0.75rem;
  border: 1px solid #ddd;
  border-radius: var(--border-radius);
  width: 100%;
  transition: var(--transition);
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--navy);
  box-shadow: 0 0 0 2px rgba(26, 31, 113, 0.2);
}

/* Layout */
.app-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.app-title {
  color: var(--navy);
  font-size: 2rem;
}

.header-controls {
  display: flex;
  gap: 0.5rem;
}

.theme-toggle, .view-toggle {
  background-color: var(--white);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow);
}

.theme-toggle:hover, .view-toggle:hover {
  transform: translateY(-2px);
}

/* Tabs */
.app-tabs {
  display: flex;
  background-color: var(--white);
  border-radius: var(--border-radius);
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.tab-button {
  flex: 1;
  padding: 1rem;
  text-align: center;
  font-weight: 500;
  color: var(--gray);
  background-color: transparent;
  transition: var(--transition);
}

.tab-button.active {
  background-color: var(--navy);
  color: var(--white);
}

.tab-button:hover:not(.active) {
  background-color: rgba(26, 31, 113, 0.1);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* Tasks Section */
.tasks-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.add-task-button {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--accent);
  color: var(--white);
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  font-weight: 500;
  transition: var(--transition);
}

.add-task-button:hover {
  background-color: var(--accent-hover);
  transform: translateY(-2px);
}

.task-filters {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.filter-button {
  padding: 0.5rem 1rem;
  background-color: var(--white);
  border-radius: var(--border-radius);
  font-weight: 500;
  box-shadow: var(--shadow);
}

.filter-button.active {
  background-color: var(--navy);
  color: var(--white);
}

.filter-button:hover:not(.active) {
  background-color: rgba(26, 31, 113, 0.1);
}

.tasks-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.task-item {
  background-color: var(--white);
  border-radius: var(--border-radius);
  padding: 1rem;
  box-shadow: var(--shadow);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
  cursor: grab;
}

.task-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.task-item.dragging {
  opacity: 0.5;
  cursor: grabbing;
}

.task-content {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  flex: 1;
}

.task-checkbox-container {
  position: relative;
  width: 24px;
  height: 24px;
  margin-top: 0.25rem;
}

.task-checkbox {
  position: absolute;
  opacity: 0;
  width: 24px;
  height: 24px;
  cursor: pointer;
}

.checkmark {
  position: absolute;
  top: 0;
  left: 0;
  width: 24px;
  height: 24px;
  border: 2px solid var(--navy);
  border-radius: 50%;
  transition: var(--transition);
}

.task-checkbox:checked + .checkmark {
  background-color: var(--navy);
}

.task-checkbox:checked + .checkmark:after {
  content: '';
  position: absolute;
  left: 8px;
  top: 4px;
  width: 5px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.task-details {
  flex: 1;
}

.task-title {
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

.task-checkbox:checked ~ .task-details .task-title {
  text-decoration: line-through;
  color: #888;
}

.task-description {
  font-size: 0.9rem;
  color: #666;
  margin-bottom: 0.5rem;
}

.task-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.8rem;
}

.task-due-date, .task-category {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.task-actions {
  display: flex;
  gap: 0.5rem;
}

.edit-task, .delete-task {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.edit-task {
  color: var(--navy);
  background-color: rgba(26, 31, 113, 0.1);
}

.delete-task {
  color: var(--danger);
  background-color: rgba(244, 67, 54, 0.1);
}

.edit-task:hover, .delete-task:hover {
  transform: translateY(-2px);
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 1rem;
  text-align: center;
}

.empty-image {
  width: 150px;
  margin-bottom: 1.5rem;
}

/* Stats Section */
.stats-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.date-range {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.stats-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  background-color: var(--white);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  text-align: center;
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--navy);
}

.chart-container {
  background-color: var(--white);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  height: 300px;
}

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.modal[aria-hidden="false"] {
  opacity: 1;
  visibility: visible;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
}

.modal-container {
  background-color: var(--white);
  border-radius: var(--border-radius);
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  z-index: 1001;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  transform: translateY(20px);
  transition: var(--transition);
}

.modal[aria-hidden="false"] .modal-container {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid #eee;
}

.close-modal {
  color: #888;
  transition: var(--transition);
}

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

.modal-body {
  padding: 1.5rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
  margin-top: 1.5rem;
}

.cancel-button {
  padding: 0.75rem 1.5rem;
  background-color: #f5f5f5;
  border-radius: var(--border-radius);
  font-weight: 500;
}

.save-button {
  padding: 0.75rem 1.5rem;
  background-color: var(--navy);
  color: var(--white);
  border-radius: var(--border-radius);
  font-weight: 500;
}

.cancel-button:hover {
  background-color: #e0e0e0;
}

.save-button:hover {
  background-color: #141a5e;
}

/* Notification */
.notification {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background-color: var(--white);
  border-radius: var(--border-radius);
  padding: 1rem 1.5rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
  display: flex;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.notification[aria-hidden="false"] {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
  visibility: visible;
}

.notification-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.close-notification {
  color: #888;
  transition: var(--transition);
}

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

/* Dark Theme */
body.dark-theme {
  background-color: var(--bg-dark);
  color: var(--text-dark);
}

body.dark-theme .app-title {
  color: var(--text-dark);
}

body.dark-theme .theme-toggle,
body.dark-theme .view-toggle,
body.dark-theme .app-tabs,
body.dark-theme .filter-button,
body.dark-theme .task-item,
body.dark-theme .stat-card,
body.dark-theme .chart-container,
body.dark-theme .modal-container,
body.dark-theme .notification {
  background-color: var(--card-dark);
  color: var(--text-dark);
}

body.dark-theme .tab-button:not(.active) {
  color: var(--text-dark);
}

body.dark-theme .tab-button:hover:not(.active) {
  background-color: rgba(255, 255, 255, 0.1);
}

body.dark-theme .task-description {
  color: #aaa;
}

body.dark-theme .stat-value {
  color: var(--accent);
}

body.dark-theme input,
body.dark-theme select,
body.dark-theme textarea {
  background-color: var(--card-dark);
  border-color: var(--border-dark);
  color: var(--text-dark);
}

body.dark-theme input:focus,
body.dark-theme select:focus,
body.dark-theme textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(76, 175, 80, 0.2);
}

body.dark-theme .cancel-button {
  background-color: #333;
}

body.dark-theme .cancel-button:hover {
  background-color: #444;
}

/* Media Queries */
@media (max-width: 768px) {
  html {
    font-size: 14px;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .stats-cards {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .app-container {
    padding: 1.5rem;
  }
  
  .stats-cards {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1025px) {
  .app-container {
    padding: 2rem;
  }
}

/* Modern CSS Features */
.task-item:has(.task-checkbox:checked) {
  background-color: rgba(76, 175, 80, 0.1);
}

:where(.form-group:not(:last-child)) {
  margin-bottom: 1.25rem;
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}

/* Print Styles */
@media print {
  body {
    background-color: white;
    color: black;
  }
  
  .app-container {
    max-width: 100%;
    padding: 0;
  }
  
  .header-controls,
  .add-task-button,
  .task-actions,
  .app-tabs {
    display: none;
  }
  
  .task-item {
    break-inside: avoid;
    page-break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ddd;
  }
  
  .chart-container {
    page-break-inside: avoid;
    break-inside: avoid;
    height: auto;
  }
}