:root {
  --bg-color: #f1f5f9;
  --card-bg: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --input-border: #cbd5e1;
  --summary-bg: #f8fafc;
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary-bg: #ffffff;
  --secondary-text: #334155;
  --secondary-hover: #f1f5f9;
  --focus-ring: #2563eb;
  --highlight-border: #3b82f6;
  --modal-overlay: rgba(15, 23, 42, 0.6);
  --error-color: #dc2626;
}

[data-theme="dark"] {
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --border-color: #334155;
  --input-border: #475569;
  --summary-bg: #0f172a;
  --primary-color: #3b82f6;
  --primary-hover: #60a5fa;
  --secondary-bg: #1e293b;
  --secondary-text: #f8fafc;
  --secondary-hover: #334155;
  --focus-ring: #60a5fa;
  --highlight-border: #60a5fa;
  --modal-overlay: rgba(0, 0, 0, 0.8);
  --error-color: #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;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  transition: background-color 0.3s, color 0.3s;
}

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

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.calculator-card {
  background: var(--card-bg);
  padding: 30px;
  border-radius: 16px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
  max-width: 720px;
  width: 100%;
  border: 1px solid var(--border-color);
}

.calculator-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 15px;
  margin-bottom: 25px;
}

.calculator-header h1 {
  font-size: 1.6rem;
  color: var(--text-primary);
  margin-bottom: 6px;
}

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

.header-actions {
  display: flex;
  gap: 8px;
}

.btn-theme-toggle, .btn-icon-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--card-bg);
  border: 1px solid var(--input-border);
  color: var(--text-primary);
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
}

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

fieldset {
  border: none;
  padding: 0;
  margin: 0;
}

.form-section {
  margin-bottom: 25px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 20px;
}

legend {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.radio-group {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.radio-card {
  border: 2px solid var(--border-color);
  background-color: var(--card-bg);
  border-radius: 10px;
  padding: 14px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  transition: all 0.2s ease;
}

.radio-card:hover {
  border-color: var(--primary-color);
}

.radio-card input {
  margin-bottom: 8px;
}

.card-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.card-desc {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.card-price {
  color: var(--primary-color);
  font-weight: 700;
  margin-top: 8px;
  font-size: 1.05rem;
}

.radio-card.highlight-card {
  border-color: var(--highlight-border);
}

.range-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--primary-color);
}

.range-value {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.checkbox-group {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 10px;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  cursor: pointer;
  color: var(--text-primary);
}

select {
  width: 100%;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid var(--input-border);
  background-color: var(--card-bg);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
}

.quote-summary {
  background-color: var(--summary-bg);
  padding: 20px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 15px;
}

.total-box {
  display: flex;
  flex-direction: column;
}

.total-box span {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.total-box strong {
  font-size: 1.8rem;
  color: var(--primary-color);
}

.actions-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  padding: 12px 18px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-full {
  width: 100%;
}

.btn-primary {
  background-color: var(--primary-color);
  color: #ffffff;
  border: none;
}

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

.btn-secondary {
  background-color: var(--secondary-bg);
  color: var(--secondary-text);
  border: 1px solid var(--input-border);
}

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

/* Pulsanti di Esportazione File */
.btn-outline-success {
  background: transparent;
  border: 1px solid #16a34a;
  color: #16a34a;
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

.btn-outline-success:hover {
  background: #16a34a;
  color: #ffffff;
}

.btn-outline-danger {
  background: transparent;
  border: 1px solid #dc2626;
  color: #dc2626;
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

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

/* MODALI */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--modal-overlay);
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  z-index: 1000;
  transition: opacity 0.2s;
}

.modal-overlay.hidden {
  display: none;
}

.modal-content {
  background: var(--card-bg);
  color: var(--text-primary);
  border-radius: 14px;
  border: 1px solid var(--border-color);
  max-width: 580px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 24px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.modal-small {
  max-width: 380px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 12px;
}

.modal-header h2 {
  font-size: 1.15rem;
}

.close-btn {
  background: none;
  border: none;
  font-size: 1.6rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.login-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 15px;
}

.login-error {
  color: var(--error-color);
  font-size: 0.85rem;
  font-weight: 600;
  margin-top: 10px;
}

.login-error.hidden {
  display: none;
}

.modal-body h3 {
  font-size: 0.95rem;
  color: var(--primary-color);
  margin: 15px 0 10px 0;
}

.admin-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}

.admin-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 10px;
}

.admin-field label {
  font-size: 0.82rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.admin-field input {
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--input-border);
  background: var(--card-bg);
  color: var(--text-primary);
  font-size: 0.95rem;
}

.export-box {
  background-color: var(--summary-bg);
  padding: 14px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.export-box span {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.export-buttons {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.export-header-print {
  display: none;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 20px;
  padding-top: 15px;
  border-top: 1px solid var(--border-color);
}

@media print {
  body {
    background: white !important;
    color: black !important;
  }
  .calculator-card {
    box-shadow: none !important;
    border: none !important;
  }
  .actions-group, .header-actions, .modal-overlay {
    display: none !important;
  }
}

.html2pdf__page-break {
  height: 0;
  page-break-before: always;
}

.form-section, .quote-summary {
  page-break-inside: avoid;
}