:root {
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --border-color: #cbd5e1;
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --column-bg: #e2e8f0;
  --drag-over-bg: #cbd5e1;
  --focus-ring: #2563eb;
  
  --prio-low: #16a34a;
  --prio-medium: #d97706;
  --prio-high: #dc2626;
}

[data-theme="dark"] {
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --border-color: #334155;
  --primary-color: #3b82f6;
  --primary-hover: #60a5fa;
  --column-bg: #1e293b;
  --drag-over-bg: #334155;
  --focus-ring: #60a5fa;

  --prio-low: #22c55e;
  --prio-medium: #f59e0b;
  --prio-high: #ef4444;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
  padding: 30px 15px;
  transition: background-color 0.3s, color 0.3s;
}

:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

.app-container {
  max-width: 1100px;
  margin: 0 auto;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 25px;
  gap: 15px;
}

.app-header h1 {
  font-size: 1.8rem;
}

.app-header p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.btn-theme-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 8px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

/* Form Nuova Scheda */
.add-task-panel {
  background: var(--card-bg);
  padding: 18px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  margin-bottom: 25px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

#add-task-form {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.form-inputs {
  display: flex;
  flex: 1;
  gap: 10px;
  min-width: 280px;
}

input, select {
  padding: 10px 14px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background-color: var(--card-bg);
  color: var(--text-primary);
  font-size: 0.95rem;
}

#task-title {
  flex: 2;
}

#task-priority {
  flex: 1;
}

.btn {
  padding: 10px 20px;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background 0.2s;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--primary-color);
  color: #ffffff;
}

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

/* Tabellone Kanban */
.kanban-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  align-items: start;
}

@media (max-width: 820px) {
  .kanban-board {
    grid-template-columns: 1fr;
  }
}

.kanban-column {
  background-color: var(--column-bg);
  border-radius: 12px;
  padding: 16px;
  min-height: 500px;
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: background-color 0.2s;
}

.kanban-column.drag-over {
  background-color: var(--drag-over-bg);
  border-style: dashed;
}

.column-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.column-header h2 {
  font-size: 1.1rem;
}

.task-count {
  background: var(--card-bg);
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 0.85rem;
  font-weight: 700;
  border: 1px solid var(--border-color);
}

.task-list {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Single Task Card */
.task-card {
  background: var(--card-bg);
  padding: 14px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
  cursor: grab;
  transition: transform 0.15s, box-shadow 0.15s, opacity 0.15s;
}

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

.task-card.dragging {
  opacity: 0.4;
  transform: scale(0.98);
}

.task-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
  margin-bottom: 10px;
}

.task-title-text {
  font-weight: 600;
  font-size: 0.95rem;
  word-break: break-word;
}

.task-priority-badge {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  text-transform: uppercase;
  color: #ffffff;
}

.priority-low { background-color: var(--prio-low); }
.priority-medium { background-color: var(--prio-medium); }
.priority-high { background-color: var(--prio-high); }

.task-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--border-color);
}

.move-btns {
  display: flex;
  gap: 5px;
}

.btn-move, .btn-delete {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  color: var(--text-secondary);
  padding: 3px 8px;
  font-size: 0.8rem;
  cursor: pointer;
}

.btn-move:hover {
  background-color: var(--primary-color);
  color: #ffffff;
}

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