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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f8f9fa;
  color: #333;
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  padding: 20px 0;
  border-bottom: 2px solid #e9ecef;
}

.header h1 {
  color: #495057;
  font-weight: 600;
}

.add-task-btn {
  background: #6c757d;
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: background-color 0.2s;
}

.add-task-btn:hover {
  background: #5a6268;
}

.kanban-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  min-height: 500px;
}

.column {
  background: white;
  border-radius: 8px;
  padding: 20px;
  border: 1px solid #dee2e6;
}

.column-header {
  text-align: center;
  margin-bottom: 20px;
  padding: 10px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.todo-header {
  background: #f3e8ff;
  color: #7c3aed;
  border: 1px solid #c4b5fd;
}

.inprogress-header {
  background: #fef3c7;
  color: #f59e0b;
  border: 1px solid #fbbf24;
}

.done-header {
  background: #dcfce7;
  color: #16a34a;
  border: 1px solid #86efac;
}

.tasks-container {
  min-height: 400px;
  border: 2px dashed #e9ecef;
  border-radius: 6px;
  padding: 10px;
  transition: border-color 0.2s;
}

.tasks-container.drag-over {
  border-color: #6c757d;
  background: #f8f9fa;
}

.task-card {
  background: white;
  border-radius: 6px;
  padding: 16px;
  margin-bottom: 12px;
  cursor: move;
  transition: all 0.2s;
  position: relative;
}

.task-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.task-card.dragging {
  opacity: 0.5;
  transform: rotate(5deg);
}

.task-card.todo {
  background: #faf5ff;
  border: 1px solid #c4b5fd;
}

.task-card.inprogress {
  background: #fffbeb;
  border: 1px solid #fbbf24;
}

.task-card.done {
  background: #f0fdf4;
  border: 1px solid #86efac;
}

.task-title {
  font-weight: 600;
  font-size: 16px;
  margin-bottom: 8px;
  color: #374151;
}

.task-description {
  font-size: 14px;
  color: #6b7280;
  margin-bottom: 12px;
  line-height: 1.4;
}

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

.task-date {
  font-size: 10px;
  color: #9ca3af;
}

.delete-btn {
  background: #ef4444;
  color: white;
  border: none;
  padding: 6px 8px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
  transition: background-color 0.2s;
}

.delete-btn:hover {
  background: #dc2626;
}

/* Modal Styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: white;
  border-radius: 8px;
  padding: 30px;
  width: 90%;
  max-width: 500px;
  transform: scale(0.7);
  transition: transform 0.3s;
}

.modal-overlay.active .modal {
  transform: scale(1);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.modal-title {
  font-size: 18px;
  font-weight: 600;
  color: #374151;
}

.close-btn {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: #6b7280;
  padding: 0;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.close-btn:hover {
  color: #374151;
}

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

.form-label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: #374151;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid #d1d5db;
  border-radius: 6px;
  font-size: 14px;
  transition: border-color 0.2s;
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: #6c757d;
}

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

.form-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

.btn {
  padding: 12px 24px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: background-color 0.2s;
}

.btn-primary {
  background: #6c757d;
  color: white;
}

.btn-primary:hover {
  background: #5a6268;
}

.btn-secondary {
  background: #e9ecef;
  color: #495057;
}

.btn-secondary:hover {
  background: #dee2e6;
}

/* Confirmation Dialog */
.confirm-dialog {
  background: white;
  border-radius: 8px;
  padding: 20px;
  width: 90%;
  max-width: 400px;
  text-align: center;
}

.confirm-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
  color: #374151;
}

.confirm-message {
  color: #6b7280;
  margin-bottom: 20px;
}

.confirm-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.btn-danger {
  background: #ef4444;
  color: white;
}

.btn-danger:hover {
  background: #dc2626;
}

/* Empty state */
.empty-state {
  text-align: center;
  color: #9ca3af;
  font-style: italic;
  padding: 40px 20px;
}