/* ==========================================================================
   Spaced Repetition Quiz App - Stili Principali (CSS Vanilla)
   Palette moderna, pulita, responsive desktop & mobile
   ========================================================================== */

:root {
  --bg-color: #f8fafc;
  --surface-color: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  
  --success-color: #16a34a;
  --success-bg: #dcfce7;
  --success-border: #86efac;
  
  --danger-color: #dc2626;
  --danger-bg: #fee2e2;
  --danger-border: #fca5a5;

  --warning-color: #d97706;
  --warning-bg: #fef3c7;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.05);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --header-height: 64px;
}

/* Reset di base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Utility per visibilità viste */
.hidden {
  display: none !important;
}

/* Top App Header */
.app-header {
  height: var(--header-height);
  background-color: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  padding: 0 1.25rem;
  position: sticky;
  top: 0;
  z-index: 40;
  box-shadow: var(--shadow-sm);
}

.burger-btn {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  transition: background-color 0.2s ease;
}

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

.burger-line {
  width: 24px;
  height: 3px;
  background-color: var(--text-main);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.header-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-left: 1rem;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

/* Menu Burger Laterale & Overlay */
.drawer-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(2px);
  z-index: 50;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease;
}

.drawer-overlay.active {
  opacity: 1;
  visibility: visible;
}

.drawer-sidebar {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  width: 280px;
  max-width: 80vw;
  background-color: var(--surface-color);
  z-index: 60;
  box-shadow: var(--shadow-lg);
  transform: translateX(-100%);
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
}

.drawer-sidebar.active {
  transform: translateX(0);
}

.drawer-header {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.drawer-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary-color);
}

.drawer-close-btn {
  background: transparent;
  border: none;
  font-size: 1.75rem;
  line-height: 1;
  cursor: pointer;
  color: var(--text-muted);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
}

.drawer-close-btn:hover {
  background-color: var(--border-color);
  color: var(--text-main);
}

.drawer-nav {
  list-style: none;
  padding: 1rem 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.drawer-nav-item button {
  width: 100%;
  text-align: left;
  background: transparent;
  border: none;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-main);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.drawer-nav-item button:hover {
  background-color: var(--primary-light);
  color: var(--primary-color);
}

.drawer-nav-item.active button {
  background-color: var(--primary-color);
  color: #ffffff;
}

/* Layout Principale */
.app-main {
  flex: 1;
  max-width: 1000px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem 1.25rem;
}

.view-section {
  animation: fadeIn 0.2s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.view-header {
  margin-bottom: 1.5rem;
}

.view-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.view-subtitle {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* Card & Griglie */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.75rem;
  word-break: break-word;
}

.card-stats {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.stat-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.stat-value {
  font-weight: 600;
  color: var(--text-main);
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.8rem;
  font-weight: 600;
}

.badge-blue {
  background-color: var(--primary-light);
  color: var(--primary-color);
}

.badge-green {
  background-color: var(--success-bg);
  color: var(--success-color);
}

/* Pulsanti */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
}

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

.btn-primary:hover:not(:disabled) {
  background-color: var(--primary-hover);
}

.btn-secondary {
  background-color: #ffffff;
  border-color: var(--border-color);
  color: var(--text-main);
}

.btn-secondary:hover:not(:disabled) {
  background-color: #f1f5f9;
}

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

.btn-danger:hover:not(:disabled) {
  background-color: var(--danger-bg);
}

.btn-block {
  width: 100%;
}

.btn:disabled, .btn[disabled] {
  opacity: 0.5;
  cursor: not-allowed !important;
  background-color: #e2e8f0 !important;
  color: #94a3b8 !important;
  border-color: #cbd5e1 !important;
  box-shadow: none !important;
  transform: none !important;
}

/* Messaggio di stato vuoto */
.empty-state {
  text-align: center;
  padding: 3rem 1.5rem;
  background-color: var(--surface-color);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-muted);
}

.empty-state-text {
  font-size: 1.05rem;
  margin-bottom: 1rem;
}

/* Vista Banche Dati */
.database-table-card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.db-list {
  list-style: none;
}

.db-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  gap: 1rem;
  flex-wrap: wrap;
}

.db-item:last-child {
  border-bottom: none;
}

.db-item-info {
  flex: 1;
  min-width: 200px;
}

.db-item-name {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text-main);
}

.db-item-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}

.db-item-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Form Styles (Import & Impostazioni) */
.form-panel {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  max-width: 640px;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

.form-input, .form-select {
  width: 100%;
  padding: 0.65rem 0.85rem;
  font-family: inherit;
  font-size: 0.95rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: #ffffff;
  color: var(--text-main);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-input:focus, .form-select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-help {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

/* Riepilogo Box Import */
.summary-box {
  background-color: var(--primary-light);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin-top: 1.5rem;
  color: #1e3a8a;
}

.summary-box-title {
  font-weight: 700;
  margin-bottom: 0.5rem;
  font-size: 1.05rem;
}

.summary-box-text {
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 1rem;
}

/* Vista Quiz */
.quiz-container {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-md);
  max-width: 760px;
  margin: 0 auto;
}

.quiz-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.progress-track {
  width: 100%;
  height: 8px;
  background-color: #e2e8f0;
  border-radius: 9999px;
  overflow: hidden;
  margin-bottom: 1.75rem;
}

.progress-bar-fill {
  height: 100%;
  background-color: var(--primary-color);
  border-radius: 9999px;
  transition: width 0.3s ease;
}

.quiz-question-box {
  margin-bottom: 2rem;
}

.quiz-question-text {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.45;
  white-space: pre-wrap;
  word-break: break-word;
}

.quiz-options-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 2rem;
}

.quiz-option-btn {
  background-color: #ffffff;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  font-family: inherit;
  font-size: 1rem;
  color: var(--text-main);
  text-align: left;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease, transform 0.05s ease;
  line-height: 1.4;
  word-break: break-word;
}

.quiz-option-btn:hover:not(:disabled) {
  border-color: var(--primary-color);
  background-color: #f8fafc;
}

.quiz-option-btn:active:not(:disabled) {
  transform: scale(0.99);
}

/* Feedback stati opzioni quiz */
.quiz-option-btn.correct {
  background-color: var(--success-bg) !important;
  border-color: var(--success-color) !important;
  color: #14532d !important;
  font-weight: 600;
}

.quiz-option-btn.wrong {
  background-color: var(--danger-bg) !important;
  border-color: var(--danger-color) !important;
  color: #7f1d1d !important;
  font-weight: 600;
}

.quiz-option-btn:disabled {
  cursor: default;
}

.quiz-footer {
  display: flex;
  justify-content: flex-end;
}

/* ==========================================================================
   Riquadro Suggerimenti (Tips) con Editor Pell
   ========================================================================== */
.quiz-tips-panel {
  margin: 1.5rem 0;
  border: 1px solid #fde68a;
  border-radius: var(--radius-md);
  background-color: #ffffff;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.quiz-tips-panel:hover {
  border-color: #fcd34d;
}

.quiz-tips-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1rem;
  background-color: #fffbeb;
  cursor: pointer;
  user-select: none;
  transition: background-color 0.15s ease;
}

.quiz-tips-header:hover {
  background-color: #fef3c7;
}

.quiz-tips-header-left {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.quiz-tips-icon {
  font-size: 1.15rem;
  line-height: 1;
}

.quiz-tips-title {
  font-weight: 700;
  font-size: 0.95rem;
  color: #92400e;
  letter-spacing: 0.02em;
}

.quiz-tips-arrow {
  font-size: 0.75rem;
  color: #b45309;
  display: inline-block;
  transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.quiz-tips-header.expanded .quiz-tips-arrow {
  transform: rotate(180deg);
}

.quiz-tips-header-right {
  display: flex;
  align-items: center;
}

.quiz-tips-edit-btn {
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  font-size: 1rem;
  line-height: 1;
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}

.quiz-tips-edit-btn:hover {
  background-color: #fef08a;
  border-color: #fde047;
  transform: scale(1.05);
}

.quiz-tips-body {
  padding: 1rem 1.25rem;
  border-top: 1px solid #fef3c7;
  background-color: #ffffff;
  animation: fadeIn 0.2s ease-in-out;
}

.quiz-tips-content {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-main);
  word-break: break-word;
}

.quiz-tips-content p {
  margin-bottom: 0.6rem;
}

.quiz-tips-content p:last-child {
  margin-bottom: 0;
}

.quiz-tips-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0.6rem 0 0.35rem;
  color: #1e293b;
}

.quiz-tips-content ul,
.quiz-tips-content ol {
  padding-left: 1.35rem;
  margin-bottom: 0.6rem;
}

.quiz-tips-content li {
  margin-bottom: 0.25rem;
}

.quiz-tips-content a {
  color: var(--primary-color);
  text-decoration: underline;
  font-weight: 500;
}

.quiz-tips-content mark {
  background-color: #fef08a;
  color: inherit;
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
}

.quiz-tips-empty {
  color: var(--text-muted);
  font-style: italic;
  font-size: 0.9rem;
}

/* Pell Editor Custom Integration */
.quiz-pell-editor {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: #ffffff;
}

.quiz-pell-editor .pell-actionbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  background-color: #f1f5f9;
  border-bottom: 1px solid var(--border-color);
  padding: 0.3rem;
  gap: 2px;
}

.quiz-pell-editor .pell-button {
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  cursor: pointer;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  height: 30px;
  min-width: 30px;
  padding: 0 0.45rem;
  margin: 1px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}

.quiz-pell-editor .pell-button:hover {
  background-color: var(--primary-light);
  border-color: #bfdbfe;
  color: var(--primary-color);
}

.quiz-pell-editor .pell-button-selected {
  background-color: var(--primary-color);
  color: #ffffff;
  border-color: var(--primary-hover);
}

.quiz-pell-editor .pell-content {
  min-height: 120px;
  max-height: 280px;
  overflow-y: auto;
  padding: 0.85rem;
  outline: none;
  font-family: inherit;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-main);
}

.quiz-pell-editor .pell-content:focus {
  background-color: #fafbfc;
}

.quiz-tips-edit-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.65rem;
  margin-top: 0.85rem;
}

/* Vista Risultati Quiz */
.result-card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 2.5rem 1.75rem;
  box-shadow: var(--shadow-md);
  max-width: 540px;
  margin: 0 auto;
  text-align: center;
}

.result-badge {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background-color: var(--primary-light);
  color: var(--primary-color);
  font-size: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem auto;
}

.result-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.result-score {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--primary-color);
  margin-bottom: 0.25rem;
  letter-spacing: -0.03em;
}

.result-percentage {
  font-size: 1.15rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 2rem;
}

.result-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
}

/* Stili per Vista Impostazioni Backup */
.settings-section-divider {
  border: 0;
  height: 1px;
  background-color: var(--border-color);
  margin: 1.75rem 0;
}

.backup-actions-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 480px) {
  .backup-actions-grid {
    grid-template-columns: 1fr 1fr;
  }
}