:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --primary-dark: #1e3a8a;
  
  --secondary: #0f172a;
  --accent: #06b6d4;
  --accent-hover: #0891b2;
  
  --success: #10b981;
  --success-light: #ecfdf5;
  --warning: #f59e0b;
  --warning-light: #fffbeb;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --border: #e2e8f0;
  --border-focus: #3b82f6;
  
  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* NAVBAR */
.navbar {
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}

.nav-container {
  max-width: 1300px;
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--secondary);
}

.brand-badge {
  background: linear-gradient(135deg, #1e3a8a, #2563eb);
  color: white;
  font-weight: 800;
  font-size: 1.15rem;
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.25);
  letter-spacing: 0.5px;
}

.brand-text h1 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--secondary);
}

.brand-text p {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.nav-tabs {
  display: flex;
  gap: 0.5rem;
  background: #f1f5f9;
  padding: 0.35rem;
  border-radius: var(--radius-full);
}

.nav-tab-btn {
  border: none;
  background: transparent;
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

.nav-tab-btn.active {
  background: #ffffff;
  color: var(--primary);
  box-shadow: var(--shadow-sm);
}

/* MAIN LAYOUT */
.main-content {
  flex: 1;
  max-width: 1300px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* SECTIONS */
.app-view {
  display: none;
  animation: fadeIn 0.3s ease-out forwards;
}

.app-view.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* DASHBOARD STATS */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.stat-info span {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.stat-info h3 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--secondary);
  margin-top: 0.25rem;
}

.stat-icon {
  width: 50px;
  height: 50px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}

.stat-icon.blue { background: #dbeafe; color: #1e40af; }
.stat-icon.yellow { background: #fef3c7; color: #92400e; }
.stat-icon.green { background: #dcfce7; color: #166534; }

/* CARD & SECTION STYLES */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  margin-bottom: 2rem;
  overflow: hidden;
}

.card-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #fafbfc;
}

.card-title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--secondary);
}

.card-body {
  padding: 1.5rem;
}

/* FORMS & INPUTS */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group.full-width {
  grid-column: 1 / -1;
}

label {
  font-size: 0.85rem;
  font-weight: 600;
  color: #334155;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

label span.req {
  color: var(--danger);
  font-weight: bold;
}

input, select, textarea {
  font-family: inherit;
  font-size: 0.925rem;
  padding: 0.7rem 0.9rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  background-color: #ffffff;
  color: var(--text-main);
  transition: var(--transition);
  outline: none;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

input::placeholder, textarea::placeholder {
  color: var(--text-light);
}

.help-text {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(37, 99, 235, 0.3);
}

.btn-success {
  background: var(--success);
  color: white;
}

.btn-success:hover {
  background: #059669;
}

.btn-outline {
  background: white;
  border: 1.5px solid var(--border);
  color: var(--text-main);
}

.btn-outline:hover {
  background: #f1f5f9;
  border-color: #cbd5e1;
}

.btn-danger {
  background: var(--danger-light);
  color: var(--danger);
  border: 1px solid #fecaca;
}

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

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 0.85rem 1.75rem;
  font-size: 1rem;
}

/* BADGES */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-warning {
  background: #fef3c7;
  color: #92400e;
  border: 1px solid #fde68a;
}

.badge-success {
  background: #dcfce7;
  color: #166534;
  border: 1px solid #bbf7d0;
}

.badge-info {
  background: #e0f2fe;
  color: #0369a1;
  border: 1px solid #bae6fd;
}

/* TABLES */
.table-responsive {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
}

.data-table th {
  background: #f8fafc;
  padding: 0.85rem 1rem;
  font-weight: 700;
  color: #475569;
  border-bottom: 1.5px solid var(--border);
  white-space: nowrap;
}

.data-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-main);
  vertical-align: middle;
}

.data-table tbody tr:hover {
  background: #f8fafc;
}

/* ACTIONS BUTTON GROUP */
.actions-cell {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* PREVIEW BOX */
.preview-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

@media (max-width: 992px) {
  .preview-container {
    grid-template-columns: 1fr;
  }
}

.paper-preview {
  background: #ffffff;
  padding: 2.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  font-family: 'Times New Roman', Times, serif;
  font-size: 13px;
  line-height: 1.6;
  max-height: 800px;
  overflow-y: auto;
  color: #111827;
}

.paper-preview h2 {
  text-align: center;
  font-size: 16px;
  font-weight: bold;
  margin-bottom: 4px;
}

.paper-preview h3 {
  text-align: center;
  font-size: 13px;
  font-style: italic;
  margin-bottom: 20px;
  font-weight: normal;
}

.paper-preview .hl {
  background-color: #fef08a;
  padding: 1px 4px;
  font-weight: bold;
  border-radius: 2px;
}

.paper-preview .signature-box {
  display: flex;
  justify-content: space-between;
  margin-top: 2rem;
  margin-bottom: 2rem;
}

.paper-preview .signature-col {
  width: 45%;
  text-align: center;
}

.paper-preview hr {
  border: none;
  border-top: 1px dashed #cbd5e1;
  margin: 1.5rem 0;
}

/* MODAL SYSTEM (Supporta .modal e .modal-overlay) */
.modal,
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(5px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  padding: 1.5rem;
  overflow-y: auto;
}

.modal.active,
.modal-overlay.active {
  display: flex !important;
}

.modal-dialog {
  max-width: 600px;
  width: 100%;
  margin: auto;
  position: relative;
  z-index: 10000;
  animation: modalScale 0.22s ease-out;
}

.modal-content,
.modal-box {
  background: #ffffff;
  border-radius: var(--radius-lg);
  width: 100%;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.35);
  overflow: hidden;
  border: 1px solid var(--border);
}

@keyframes modalScale {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #f8fafc;
}

.modal-title,
.modal-header h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--secondary);
  margin: 0;
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-muted);
  line-height: 1;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.modal-close:hover {
  background: #fee2e2;
  color: #dc2626;
}

.modal-body {
  padding: 1.5rem;
}

.modal-footer {
  padding: 1rem 1.5rem;
  background: #f8fafc;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  align-items: center;
}

/* COPY BOX */
.copy-box {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.copy-box input {
  flex: 1;
  background: #f8fafc;
}

/* CHECKBOX & RADIO */
.checkbox-card {
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  cursor: pointer;
  transition: var(--transition);
  background: white;
}

.checkbox-card:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.checkbox-card input[type="checkbox"] {
  width: 20px;
  height: 20px;
  margin-top: 2px;
  accent-color: var(--primary);
  cursor: pointer;
}

.checkbox-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--secondary);
}

.checkbox-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* TOAST NOTIFICATION */
#toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  background: #ffffff;
  border-radius: var(--radius-md);
  padding: 0.85rem 1.25rem;
  box-shadow: var(--shadow-xl);
  border-left: 5px solid var(--primary);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9rem;
  font-weight: 500;
  animation: slideInRight 0.25s ease-out;
}

.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(50px); }
  to { opacity: 1; transform: translateX(0); }
}

/* FOOTER */
.app-footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--text-light);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  background: #ffffff;
  margin-top: auto;
}