/* CSS Variables for Theme Management */
:root {
  --primary-color: #3F1426;
  --secondary-color: #7A1935;
  --accent-color: #C2185B;
  --highlight-color: #E91E63;
  --light-accent: #F8BBD9;
  
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-card: #ffffff;
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-muted: #999999;
  --border-color: #e0e0e0;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.15);
  
  --priority-alta: #f44336;
  --priority-media: #ff9800;
  --priority-baixa: #4caf50;
  
  --status-overdue: #f44336;
  --status-due-soon: #ff9800;
  --status-completed: #4caf50;
  
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme Variables */
[data-theme="dark"] {
  --bg-primary: #121212;
  --bg-secondary: #1e1e1e;
  --bg-card: #2d2d2d;
  --text-primary: #ffffff;
  --text-secondary: #b3b3b3;
  --text-muted: #666666;
  --border-color: #404040;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.4);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: var(--transition);
}

/* App Container */
.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header Styles */
.header {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 1.5rem 0;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.app-title {
  font-size: 2rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header-controls {
  display: flex;
  gap: 1rem;
}

.theme-toggle,
.stats-btn {
  background: rgba(255, 255, 255, 0.2);
  border: none;
  color: white;
  padding: 0.75rem;
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition);
  font-size: 1rem;
}

.theme-toggle:hover,
.stats-btn:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.1);
}

/* Main Content */
.main-content {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem;
  width: 100%;
}

/* Form Section */
.task-form-section {
  margin-bottom: 2rem;
}

.form-container {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
}

.form-title {
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.5rem;
}

.task-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

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

.form-group label {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.9rem;
}

.form-group input,
.form-group textarea,
.form-group select {
  padding: 0.75rem;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 1rem;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(194, 24, 91, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 80px;
}

.form-actions {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

/* Button Styles */
.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  justify-content: center;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-color), var(--highlight-color));
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

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

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

.btn-danger:hover {
  background: #d32f2f;
  transform: translateY(-1px);
}

/* Controls Section */
.controls-section {
  margin-bottom: 2rem;
}

.controls-container {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.filters {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.filter-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.filter-group select {
  padding: 0.5rem;
  border: 2px solid var(--border-color);
  border-radius: 6px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.9rem;
  min-width: 120px;
}

.search-container {
  position: relative;
  display: flex;
  align-items: center;
}

.search-container input {
  padding: 0.75rem 2.5rem 0.75rem 1rem;
  border: 2px solid var(--border-color);
  border-radius: 25px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.9rem;
  width: 250px;
  transition: var(--transition);
}

.search-container input:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(194, 24, 91, 0.1);
}

.search-container i {
  position: absolute;
  right: 1rem;
  color: var(--text-muted);
}

/* Tasks Section */
.tasks-section {
  margin-bottom: 2rem;
}

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

.tasks-header h2 {
  color: var(--primary-color);
  font-size: 1.8rem;
}

.tasks-count {
  background: var(--light-accent);
  color: var(--primary-color);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-weight: 600;
  font-size: 0.9rem;
}

.tasks-container {
  display: grid;
  gap: 1rem;
}

/* Task Card Styles */
.task-card {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-color);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

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

.task-card.completed {
  opacity: 0.7;
  border-left-color: var(--status-completed);
}

.task-card.overdue {
  border-left-color: var(--status-overdue);
  background: linear-gradient(135deg, var(--bg-card), rgba(244, 67, 54, 0.05));
}

.task-card.due-soon {
  border-left-color: var(--status-due-soon);
  background: linear-gradient(135deg, var(--bg-card), rgba(255, 152, 0, 0.05));
}

.task-card.priority-alta {
  border-left-color: var(--priority-alta);
}

.task-card.priority-media {
  border-left-color: var(--priority-media);
}

.task-card.priority-baixa {
  border-left-color: var(--priority-baixa);
}

.task-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1rem;
}

.task-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.task-card.completed .task-title {
  text-decoration: line-through;
  color: var(--text-muted);
}

.task-description {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.5;
}

.task-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1rem;
}

.task-priority {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 0.25rem 0.75rem;
  border-radius: 12px;
}

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

.task-priority.media {
  background: rgba(255, 152, 0, 0.1);
  color: var(--priority-media);
}

.task-priority.baixa {
  background: rgba(76, 175, 80, 0.1);
  color: var(--priority-baixa);
}

.task-due-date {
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.task-due-date.overdue {
  color: var(--status-overdue);
  font-weight: 600;
}

.task-due-date.due-so
on {
  color: var(--status-due-soon);
  font-weight: 600;
}

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

.task-action-btn {
  padding: 0.5rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 36px;
}

.task-action-btn.complete {
  background: rgba(76, 175, 80, 0.1);
  color: var(--status-completed);
}

.task-action-btn.complete:hover {
  background: var(--status-completed);
  color: white;
}

.task-action-btn.edit {
  background: rgba(33, 150, 243, 0.1);
  color: #2196f3;
}

.task-action-btn.edit:hover {
  background: #2196f3;
  color: white;
}

.task-action-btn.delete {
  background: rgba(244, 67, 54, 0.1);
  color: var(--priority-alta);
}

.task-action-btn.delete:hover {
  background: var(--priority-alta);
  color: white;
}

.task-checkbox {
  margin-right: 1rem;
}

.task-checkbox input[type="checkbox"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

.empty-state i {
  font-size: 4rem;
  margin-bottom: 1rem;
  color: var(--border-color);
}

.empty-state h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

/* Modal Styles */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  backdrop-filter: blur(4px);
}

.modal.active {
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.3s ease;
}

.modal-content {
  background: var(--bg-card);
  border-radius: 12px;
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: var(--shadow-hover);
  animation: slideUp 0.3s ease;
}

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

.modal-header h2 {
  color: var(--primary-color);
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
  padding: 0.5rem;
  border-radius: 50%;
  transition: var(--transition);
}

.modal-close:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.modal-body {
  padding: 1.5rem;
}

/* Stats Styles */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-secondary);
  padding: 1.5rem;
  border-radius: 8px;
  text-align: center;
  border: 1px solid var(--border-color);
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-color);
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.priority-stats h3 {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.priority-bars {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.priority-bar {
  display: grid;
  grid-template-columns: 80px 1fr 40px;
  gap: 1rem;
  align-items: center;
}

.priority-label {
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
}

.priority-label.alta {
  color: var(--priority-alta);
}

.priority-label.media {
  color: var(--priority-media);
}

.priority-label.baixa {
  color: var(--priority-baixa);
}

.progress-bar {
  height: 8px;
  background: var(--border-color);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.5s ease;
}

.progress-fill.alta {
  background: var(--priority-alta);
}

.progress-fill.media {
  background: var(--priority-media);
}

.progress-fill.baixa {
  background: var(--priority-baixa);
}

.priority-count {
  font-weight: 600;
  color: var(--text-secondary);
  text-align: right;
}

/* Notification Styles */
.notification-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.notification {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem 1.5rem;
  box-shadow: var(--shadow-hover);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 300px;
  animation: slideInRight 0.3s ease;
}

.notification.success {
  border-left: 4px solid var(--status-completed);
}

.notification.error {
  border-left: 4px solid var(--status-overdue);
}

.notification.warning {
  border-left: 4px solid var(--status-due-soon);
}

.notification-icon {
  font-size: 1.2rem;
}

.notification.success .notification-icon {
  color: var(--status-completed);
}

.notification.error .notification-icon {
  color: var(--status-overdue);
}

.notification.warning .notification-icon {
  color: var(--status-due-soon);
}

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

.notification-close {
  background: none;
  border: none;
  font-size: 1rem;
  cursor: pointer;
  color: var(--text-muted);
  padding: 0.25rem;
}

/* Footer */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 1rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: auto;
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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

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

@keyframes slideOut {
  to {
    transform: translateX(100%);
    opacity: 0;
  }
}

.task-card.removing {
  animation: slideOut 0.3s ease forwards;
}

/* Responsive Design */
@media (max-width: 768px) {
  .header-content {
    padding: 0 1rem;
  }
  
  .app-title {
    font-size: 1.5rem;
  }
  
  .main-content {
    padding: 1rem;
  }
  
  .form-container {
    padding: 1.5rem;
  }
  
  .form-row {
    grid-template-columns: 1fr;
  }
  
  .controls-container {
    flex-direction: column;
    align-items: stretch;
  }
  
  .filters {
    justify-content: center;
  }
  
  .search-container input {
    width: 100%;
  }
  
  .task-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
  
  .task-actions {
    justify-content: center;
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .priority-bar {
    grid-template-columns: 1fr;
    gap: 0.5rem;
    text-align: center;
  }
  
  .notification {
    min-width: 280px;
    margin: 0 10px;
  }
}

@media (max-width: 480px) {
  .header-controls {
    gap: 0.5rem;
  }
  
  .theme-toggle,
  .stats-btn {
    padding: 0.5rem;
    font-size: 0.9rem;
  }
  
  .form-actions {
    flex-direction: column;
  }
  
  .filters {
    flex-direction: column;
    gap: 1rem;
  }
  
  .filter-group select {
    min-width: 100%;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .modal-content {
    width: 95%;
  }
  
  .modal-header,
  .modal-body {
    padding: 1rem;
  }
}

/* Print Styles */
@media print {
  .header-controls,
  .controls-section,
  .task-actions,
  .footer,
  .notification-container {
    display: none !important;
  }
  
  .task-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ccc;
  }
  
  body {
    background: white !important;
    color: black !important;
  }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
  :root {
    --border-color: #000000;
    --text-muted: #000000;
  }
  
  [data-theme="dark"] {
    --border-color: #ffffff;
    --text-muted: #ffffff;
  }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus Styles for Accessibility */
*:focus {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

button:focus,
input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--accent-color);
  outline-offset: 2px;
}

/* Loading States */
.loading {
  opacity: 0.6;
  pointer-events: none;
  position: relative;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--border-color);
  border-top: 2px solid var(--accent-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}