/* Variabili CSS per la gestione dei Temi e Contrasti WCAG */
:root {
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --border-color: #cbd5e1;
  --primary-color: #1d4ed8;
  --primary-hover: #1e40af;
  --income-color: #15803d;
  --expense-color: #b91c1c;
  --tab-bg: #e2e8f0;
  --tab-btn-text: #334155;
  --tab-btn-active: #ffffff;
  --item-bg: #f1f5f9;
  --focus-ring: #2563eb;
}

/* Tema Scuro */
[data-theme="dark"] {
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --border-color: #334155;
  --primary-color: #3b82f6;
  --primary-hover: #60a5fa;
  --income-color: #22c55e;
  --expense-color: #ef4444;
  --tab-bg: #0f172a;
  --tab-btn-text: #cbd5e1;
  --tab-btn-active: #1e293b;
  --item-bg: #0f172a;
  --focus-ring: #60a5fa;
}

* {
  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;
}

/* Accessibilità: Visibilità del focus per la tastiera */
:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}

.app-container {
  max-width: 1000px;
  margin: 0 auto;
}

/* Header & Toggle Tema */
.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;
}

.btn-theme-toggle:hover {
  border-color: var(--primary-color);
}

/* Carte Bilancio */
.summary-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 15px;
  margin-bottom: 25px;
}

.card {
  background: var(--card-bg);
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.card span {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 5px;
}

.card strong {
  font-size: 1.5rem;
}

.total-balance strong { color: var(--text-primary); }
.income strong { color: var(--income-color); }
.expenses strong { color: var(--expense-color); }

/* Layout Grid */
.content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 820px) {
  .app-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .content-grid {
    grid-template-columns: 1fr;
  }
}

.panel-card {
  background: var(--card-bg);
  padding: 22px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  margin-bottom: 20px;
}

.panel-card h2 {
  font-size: 1.1rem;
  margin-bottom: 15px;
  color: var(--text-primary);
}

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

/* Form Styles */
.form-group {
  margin-bottom: 12px;
}

.form-row {
  display: flex;
  gap: 10px;
}

.form-row .form-group {
  flex: 1;
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

input, select {
  width: 100%;
  padding: 9px 12px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background-color: var(--card-bg);
  color: var(--text-primary);
  font-size: 0.95rem;
}

.btn {
  width: 100%;
  padding: 10px;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background 0.2s;
}

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

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

.btn-text {
  background: none;
  border: none;
  color: var(--expense-color);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

/* Grafico & Tab */
.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 15px;
}

.chart-tabs {
  display: flex;
  background-color: var(--tab-bg);
  padding: 3px;
  border-radius: 8px;
  gap: 2px;
}

.tab-btn {
  background: none;
  border: none;
  padding: 6px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--tab-btn-text);
  border-radius: 6px;
  cursor: pointer;
}

.tab-btn.active {
  background-color: var(--tab-btn-active);
  color: var(--primary-color);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.chart-container {
  position: relative;
  max-width: 280px;
  margin: 0 auto;
}

/* Lista Transazioni */
.transaction-list {
  list-style: none;
  max-height: 480px;
  overflow-y: auto;
}

.transaction-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px;
  border-radius: 8px;
  background-color: var(--item-bg);
  border-left: 5px solid var(--border-color);
  margin-bottom: 10px;
}

.transaction-item.income { border-left-color: var(--income-color); }
.transaction-item.expense { border-left-color: var(--expense-color); }

.item-info {
  display: flex;
  flex-direction: column;
}

.item-title {
  font-weight: 600;
  font-size: 0.95rem;
}

.item-category {
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.item-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.item-amount {
  font-weight: 700;
  font-size: 0.95rem;
}

.delete-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.2rem;
  padding: 2px 6px;
  border-radius: 4px;
}

.delete-btn:hover {
  color: var(--expense-color);
}