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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  padding: 20px;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
}

.header {
  text-align: center;
  color: white;
  margin-bottom: 30px;
}

.header h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.header p {
  font-size: 1.1rem;
  opacity: 0.9;
}

/* Task Form Styles */
.task-form {
  background: white;
  padding: 25px;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  margin-bottom: 30px;
  backdrop-filter: blur(10px);
}

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

.form-group {
  flex: 1;
  min-width: 200px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: #333;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px;
  border: 2px solid #e1e5e9;
  border-radius: 8px;
  font-size: 14px;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: #667eea;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 60px;
}

.add-btn {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  border: none;
  padding: 12px 30px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.add-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

.add-btn:active {
  transform: translateY(0);
}

/* Kanban Board Styles */
.kanban-board {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 25px;
  margin-top: 30px;
}

.column {
  display: flex;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.95);
  border-radius: 15px;
  padding: 20px;
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  min-height: 500px;
}

.column-header {
  text-align: center;
  margin-bottom: 20px;
  padding: 15px;
  border-radius: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.column[data-status="todo"] .column-header {
  background: linear-gradient(135deg, #ff6b6b, #ff8e8e);
  color: white;
}

.column[data-status="inprogress"] .column-header {
  background: linear-gradient(135deg, #4ecdc4, #44a08d);
  color: white;
}

.column[data-status="done"] .column-header {
  background: linear-gradient(135deg, #56ab2f, #a8e6cf);
  color: white;
}

.tasks-container {
  min-height: 400px;
  border-radius: 10px;
  padding: 10px;
  transition: all 0.3s ease;
  flex: 1;
}

.tasks-container.drag-over {
  background: linear-gradient(
    135deg,
    rgba(102, 126, 234, 0.1),
    rgba(118, 75, 162, 0.1)
  );
  border: 2px dashed #667eea;
}

/* Task Card Styles */
.task-card {
  background: white;
  border: 1px solid #e1e5e9;
  border-radius: 12px;
  padding: 16px;
  margin-bottom: 15px;
  cursor: grab;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
  position: relative;
  overflow: hidden;
}

.task-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
  border-color: #667eea;
}

.task-card:active {
  cursor: grabbing;
}

.task-card.dragging {
  opacity: 0.7;
  transform: rotate(5deg) scale(1.05);
  z-index: 1000;
}

.task-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(135deg, #667eea, #764ba2);
}

.task-title {
  font-weight: 700;
  font-size: 1.1rem;
  color: #2c3e50;
  margin-bottom: 8px;
  line-height: 1.3;
}

.task-description {
  color: #666;
  font-size: 0.95rem;
  line-height: 1.4;
  margin-bottom: 12px;
}

.task-meta {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: center;
  font-size: 0.8rem;
  color: #999;
  border-top: 1px solid #f0f0f0;
  padding-top: 8px;
}

.task-id {
  font-family: monospace;
  background: #f8f9fa;
  padding: 2px 6px;
  border-radius: 4px;
}

/* Responsive Design */
@media (max-width: 768px) {
  .header h1 {
    font-size: 2rem;
  }

  .kanban-board {
    grid-template-columns: 1fr;
    gap: 20px;
  }

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

  .task-form {
    padding: 20px;
  }
}

/* Empty State */
.empty-column {
  text-align: center;
  color: #999;
  font-style: italic;
  padding: 40px 20px;
  border: 2px dashed #e1e5e9;
  border-radius: 10px;
  margin-top: 20px;
}