:root {
  --primary-color: #0066cc;
  --primary-dark: #00478a;
  --secondary-color: #e63946;
  --light-bg: #f8f9fa;
  --dark-text: #212529;
  --success-color: #28a745;
  --danger-color: #dc3545;
  --border-radius: 12px;
  --box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

body {
  background-color: var(--light-bg);
  color: var(--dark-text);
  padding-bottom: 50px;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.header {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: white;
  padding: 2.5rem 0;
  margin-bottom: 2rem;
  border-bottom: 5px solid rgba(255, 255, 255, 0.1);
  position: relative;
  overflow: hidden;
}
.header::before {
  content: "";
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 320'%3E%3Cpath fill='%23ffffff' fill-opacity='0.1' d='M0,128L48,117.3C96,107,192,85,288,112C384,139,480,213,576,218.7C672,224,768,160,864,138.7C960,117,1056,139,1152,149.3C1248,160,1344,160,1392,160L1440,160L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z'%3E%3C/path%3E%3C/svg%3E");
  background-size: cover; background-position: center bottom;
}

.card {
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  margin-bottom: 25px;
  border: none;
  transition: var(--transition);
  overflow: hidden;
}
.card:hover { transform: translateY(-8px); box-shadow: 0 12px 30px rgba(0,0,0,0.15); }
.card-header {
  background: linear-gradient(to right, var(--primary-color), var(--primary-dark));
  color: white; font-weight: 600; border-bottom: none; padding: 1rem 1.5rem;
}

.card-title {
  font-weight: 700; color: var(--primary-color);
  margin-bottom: 1.5rem; padding-bottom: 0.75rem;
  border-bottom: 2px solid rgba(0, 102, 204, 0.2);
  display: flex; align-items: center; gap: 10px;
}
.card-title i { font-size: 1.4rem; }

.table-responsive {
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
.table th {
  background: linear-gradient(to right, var(--primary-color), var(--primary-dark));
  color: white; font-weight: 600; padding: 1rem; border: none;
}
.table td { padding: 1rem; vertical-align: middle; }
.table-hover tbody tr:hover { background-color: rgba(0, 102, 204, 0.05); transition: var(--transition); }

.btn {
  border-radius: 50px; padding: 0.6rem 1.5rem; font-weight: 600;
  transition: var(--transition); display: inline-flex; align-items: center; gap: 8px;
}
.btn-primary { background: linear-gradient(to right, var(--primary-color), var(--primary-dark)); border: none; }
.btn-primary:hover {
  background: linear-gradient(to right, var(--primary-dark), #003366);
  transform: translateY(-3px); box-shadow: 0 6px 15px rgba(0,102,204,0.3);
}
.btn-add { background: linear-gradient(to right, var(--success-color), #1e7e34); border: none; color: white; }
.btn-add:hover {
  background: linear-gradient(to right, #218838, #186429);
  transform: translateY(-3px); box-shadow: 0 6px 15px rgba(40,167,69,0.3);
}
.btn-reset { background: linear-gradient(to right, var(--danger-color), #bd2130); border: none; color: white; }
.btn-reset:hover {
  background: linear-gradient(to right, #c82333, #a71e2a);
  transform: translateY(-3px); box-shadow: 0 6px 15px rgba(220,53,69,0.3);
}

.input-group-text { background: linear-gradient(to bottom, #f8f9fa, #e9ecef); font-weight: 500; border: 1px solid #ced4da; }
.form-control:focus, .form-select:focus { border-color: var(--primary-color); box-shadow: 0 0 0 0.25rem rgba(0,102,204,0.25); }

.result-positive { color: var(--danger-color); font-weight: bold; }
.result-negative { color: var(--success-color); font-weight: bold; }

.instructions {
  background: linear-gradient(to bottom, #ffffff, #f8f9fa);
  border-left: 4px solid var(--primary-color);

  padding: 1.5rem; margin-bottom: 2rem; border-radius: var(--border-radius); box-shadow: var(--box-shadow);
}

.footer {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: white; padding: 1.5rem 0; margin-top: 3rem; text-align: center; position: relative; overflow: hidden;
}
.footer::before {
  content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1440 320'%3E%3Cpath fill='%23ffffff' fill-opacity='0.1' d='M0,96L48,112C96,128,192,160,288,170.7C384,181,480,171,576,165.3C672,160,768,160,864,176C960,192,1056,224,1152,224C1248,224,1344,192,1392,176L1440,160L1440,0L1392,0C1344,0,1248,0,1152,0C1056,0,960,0,864,0C768,0,672,0,576,0C480,0,384,0,288,0C192,0,96,0,48,0L0,0Z'%3E%3C/path%3E%3C/svg%3E");
  background-size: cover; background-position: center top;
}

.month-selector {
  background: linear-gradient(to bottom, #f0f8ff, #e1efff);
  padding: 1.5rem; border-radius: var(--border-radius); margin-bottom: 2rem; box-shadow: var(--box-shadow);
}

.summary-card {
  background: linear-gradient(to bottom, #ffffff, #f8f9fa);
  border-left: 4px solid var(--primary-color); box-shadow: var(--box-shadow);
}

.index-badge {
  font-size: 1.1em; font-weight: 600; padding: 8px 15px; border-radius: 50px;
  background: linear-gradient(to right, var(--primary-color), var(--primary-dark));
  color: white; box-shadow: 0 4px 8px rgba(0,102,204,0.2);
}

.decimal-config {
  background: linear-gradient(to bottom, #e8f4ff, #d9ebff);
  padding: 1.5rem; border-radius: var(--border-radius); margin-bottom: 2rem; box-shadow: var(--box-shadow);
}

.historical-data {
  max-height: 300px; overflow-y: auto; border-radius: var(--border-radius);
  box-shadow: inset 0 0 10px rgba(0,0,0,0.05);
}

#inflationChart {
  max-width: 100%; margin: 0 auto; border-radius: var(--border-radius);
  overflow: hidden; box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.projected-index {
  color: #d7232b;   /* rosso */
  font-weight: 600; /* opzionale: bold */
}

/* forza il rosso solo nella tabella di riepilogo */
#summaryTable td.projected-index {
  color: #d7232b !important;
  font-weight: 600;
}




.stat-card {
  text-align: center; padding: 1.5rem; border-radius: var(--border-radius);
  background: white; box-shadow: var(--box-shadow); transition: var(--transition);
}

.stat-card:hover { transform: translateY(-5px); }
.stat-value { font-size: 2rem; font-weight: 700; margin: 0.5rem 0; color: var(--primary-color); }
.stat-label { font-size: 0.9rem; color: #6c757d; font-weight: 600; }

.nav-tabs .nav-link {
  border: none; border-bottom: 3px solid transparent; font-weight: 600; color: #6c757d;
  padding: 0.8rem 1.5rem; transition: var(--transition);
}
.nav-tabs .nav-link.active { color: var(--primary-color); border-bottom: 3px solid var(--primary-color); background: transparent; }
.nav-tabs .nav-link:hover { border-color: var(--primary-color); }

@media (max-width: 768px) {
  .header { padding: 1.5rem 0; }
  .card { margin-bottom: 15px; }
  .btn { width: 100%; margin-bottom: 10px; justify-content: center; }
  .d-md-flex { flex-direction: column; }
}