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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  min-height: 100vh;
  color: #e4e4e7;
}

.app {
  min-height: 100vh;
  padding: 1rem;
}

header {
  text-align: center;
  padding: 1rem;
  margin-bottom: 1rem;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(90deg, #818cf8, #c084fc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.board {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 1rem;
}

@media (max-width: 1200px) {
  .board {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .board {
    grid-template-columns: 1fr;
  }
}

.column {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  padding: 1rem;
  min-height: 400px;
  display: flex;
  flex-direction: column;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: background 0.2s, border-color 0.2s;
}

.column-over {
  background: rgba(129, 140, 248, 0.1);
  border-color: rgba(129, 140, 248, 0.3);
}

.column-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.column-header h2 {
  font-size: 1rem;
  font-weight: 600;
}

.task-count {
  background: rgba(255, 255, 255, 0.1);
  padding: 0.25rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 500;
}

.tasks {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-height: 100px;
}

.task-card {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 0.75rem;
  cursor: grab;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
  position: relative;
}

.task-card:hover {
  background: rgba(255, 255, 255, 0.12);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

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

.task-card-overlay {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  transform: rotate(3deg);
}

.task-card p {
  font-size: 0.875rem;
  line-height: 1.4;
  word-break: break-word;
}

.task-actions {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  display: none;
  gap: 0.25rem;
}

.task-card:hover .task-actions {
  display: flex;
}

.task-actions button {
  background: rgba(0, 0, 0, 0.3);
  border: none;
  border-radius: 4px;
  padding: 0.25rem;
  cursor: pointer;
  font-size: 0.75rem;
  opacity: 0.7;
  transition: opacity 0.15s;
}

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

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

.task-edit input {
  flex: 1;
  padding: 0.5rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  background: rgba(0, 0, 0, 0.2);
  color: inherit;
  font-size: 0.875rem;
}

.task-edit button {
  padding: 0.5rem 0.75rem;
  background: #818cf8;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.75rem;
}

.add-task-btn {
  width: 100%;
  padding: 0.75rem;
  background: transparent;
  border: 1px dashed rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  color: rgba(255, 255, 255, 0.5);
  cursor: pointer;
  font-size: 0.875rem;
  transition: border-color 0.15s, color 0.15s;
  margin-top: auto;
}

.add-task-btn:hover {
  border-color: rgba(255, 255, 255, 0.4);
  color: rgba(255, 255, 255, 0.8);
}

.add-task-form {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: auto;
}

.add-task-form input {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.2);
  color: inherit;
  font-size: 0.875rem;
}

.add-task-form input:focus {
  outline: none;
  border-color: #818cf8;
}

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

.form-actions button {
  flex: 1;
  padding: 0.5rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 500;
  transition: opacity 0.15s;
}

.form-actions button[type="submit"] {
  background: #818cf8;
  color: white;
}

.form-actions button[type="button"] {
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.7);
}

.form-actions button:hover {
  opacity: 0.9;
}