:root {
  --primary: #00ffd9;
  --primary-dark: #00ccaa;
  --bg-dark: #0e0e1a;
  --bg-medium: #15152a;
  --column-bg: #1e1e2e;
  --task-bg: #181828;
  --text-light: #fff;
  --text-muted: #ccc;
  --danger: #ff4e50;
  --warning: #ffa500;
  --success: #4caf50;
  --border-radius: 12px;
  --transition: all 0.3s ease;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: linear-gradient(135deg, var(--bg-dark), var(--bg-medium));
  color: var(--text-light);
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  line-height: 1.5;
}

header {
  text-align: center;
  padding: 1rem;
  width: 100%;
  max-width: 1200px;
  position: sticky;
  top: 0;
  background: rgba(14, 14, 26, 0.9);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  z-index: 100;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

h1 {
  margin: 0.5rem 0;
  font-size: clamp(1.8rem, 5vw, 2.5rem);
  color: var(--primary);
  font-weight: 700;
}

p.description {
  color: var(--text-muted);
  margin: 0.5rem 0 1rem;
  font-size: clamp(0.9rem, 3vw, 1.1rem);
}

.controls {
  display: flex;
  gap: 0.8rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

button,
select {
  font-family: inherit;
  font-size: 0.9rem;
  transition: var(--transition);
}

.controls select,
.controls button {
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  border: none;
  background: var(--column-bg);
  color: var(--text-light);
  cursor: pointer;
  min-height: 40px;
}

.controls select:hover,
.controls button:not(:disabled):hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.controls button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.controls button.primary {
  background: var(--primary);
  color: var(--bg-dark);
  font-weight: 600;
}

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

.board {
  display: flex;
  gap: 1.5rem;
  padding: 1rem;
  width: 100%;
  max-width: 1200px;
  overflow-x: auto;
  min-height: 60vh;
}

.board::-webkit-scrollbar {
  height: 8px;
  width: 8px;
}

.board::-webkit-scrollbar-track {
  background: var(--bg-dark);
  border-radius: 4px;
}

.board::-webkit-scrollbar-thumb {
  background-color: var(--primary);
  border-radius: 4px;
  border: 2px solid var(--bg-dark);
}

.board::-webkit-scrollbar-thumb:hover {
  background-color: var(--primary-dark);
}

.board {
  scrollbar-width: thin;
  scrollbar-color: var(--primary) var(--bg-dark);
}

@supports not (scrollbar-width: thin) {
  .board {
    padding-bottom: 8px;
  }
}

.column {
  background: var(--column-bg);
  border-radius: var(--border-radius);
  padding: 1rem;
  min-width: 280px;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.column h2 {
  font-size: 1.1rem;
  color: var(--primary);
  margin: 0 0 1rem;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
}

.column-count {
  background: var(--primary);
  color: var(--bg-dark);
  font-size: 0.8rem;
  padding: 0.1rem 0.5rem;
  border-radius: 10px;
  font-weight: bold;
}

.tasks-container {
  flex-grow: 1;
  min-height: 100px;
  transition: var(--transition);
}

.task {
  background: var(--task-bg);
  padding: 12px 16px;
  border-radius: 10px;
  margin-bottom: 0.8rem;
  cursor: grab;
  transition: var(--transition);
  position: relative;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.task:hover {
  background: #22223a;
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.task:active {
  cursor: grabbing;
  transform: scale(1.02);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.task.done {
  opacity: 0.7;
  background: #1a1a2a;
}

.task.done .task-text {
  text-decoration: line-through;
}

.task.done:hover {
  opacity: 0.9;
}

.task-actions {
  position: absolute;
  top: 8px;
  right: 8px;
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: var(--transition);
}

.task:hover .task-actions {
  opacity: 1;
}

.task-btn {
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: var(--text-light);
  width: 24px;
  height: 24px;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  transition: var(--transition);
}

.task-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.1);
}

.task-btn.delete:hover {
  background: var(--danger);
}

.task-btn.edit:hover {
  background: var(--primary);
  color: var(--bg-dark);
}

.task-text {
  padding-right: 30px;
  word-break: break-word;
}

.meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 6px;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.priority {
  font-size: 0.65rem;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: bold;
  text-transform: uppercase;
}

.priority-high {
  background-color: var(--danger);
}

.priority-medium {
  background-color: var(--warning);
  color: #333;
}

.priority-low {
  background-color: var(--success);
}

.add-task-form {
  margin-top: auto;
  padding-top: 1rem;
}

.add-task-form input,
.add-task-form select,
.add-task-form textarea {
  width: 100%;
  padding: 10px;
  border: none;
  border-radius: 8px;
  background: #2a2a40;
  color: var(--text-light);
  margin-top: 0.5rem;
  font-family: inherit;
  transition: var(--transition);
}

.add-task-form input:focus,
.add-task-form select:focus,
.add-task-form textarea:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--primary);
}

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

.add-task-btn {
  background: var(--primary);
  color: var(--bg-dark);
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  margin-top: 0.5rem;
  width: 100%;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.add-task-btn:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

.drag-over {
  border: 2px dashed var(--primary);
  background: rgba(0, 255, 217, 0.1);
}

.empty-state {
  color: var(--text-muted);
  text-align: center;
  padding: 1rem;
  font-size: 0.9rem;
  border: 1px dashed rgba(255, 255, 255, 0.1);
  border-radius: 8px;
}

.dragging {
  opacity: 0.5;
  transform: scale(0.98);
}

.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--column-bg);
  color: white;
  padding: 12px 24px;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toast.show {
  opacity: 1;
}

.toast.success {
  border-left: 4px solid var(--success);
}

.toast.error {
  border-left: 4px solid var(--danger);
}

.toast.info {
  border-left: 4px solid var(--primary);
}

@media (max-width: 768px) {
  .board {
    flex-direction: column;
    align-items: stretch;
    padding: 0.5rem;
  }

  .column {
    min-width: auto;
  }

  .controls {
    gap: 0.5rem;
  }

  .controls select,
  .controls button {
    padding: 0.5rem;
    font-size: 0.8rem;
    flex: 1 1 120px;
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

.task.new-task {
  animation: fadeIn 0.3s ease-out;
}

.pulse {
  animation: pulse 2s infinite;
}