/* --------------------------------------------------
   Base
-------------------------------------------------- */

body {
  background-color: #f8f9fa;
}

/* --------------------------------------------------
   Card calcolatore
-------------------------------------------------- */

.calculator-section {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 20px;
  border-radius: 20px;
  max-width: 700px;
  margin: 0 auto 30px auto;
}

.calculator-card {
  border: none;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
  transition: transform 0.3s ease;
  margin-bottom: 20px;
  width: 100%;
}

.calculator-card:hover {
  transform: translateY(-5px);
}

.calculator-card .card-body {
  padding: 1.5rem;
}

/* --------------------------------------------------
   Titoli e descrizioni
-------------------------------------------------- */

.calculator-title {
  font-size: clamp(1.3rem, 4vw, 1.8rem);
  font-weight: 700;
  background: linear-gradient(135deg, #667eea, #764ba2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.calculator-description {
  font-size: clamp(0.85rem, 2.5vw, 0.95rem);
  color: #6c757d;
  line-height: 1.5;
  margin-bottom: 1.5rem;
}

/* --------------------------------------------------
   Tabs
-------------------------------------------------- */

.nav-tabs .nav-link {
  font-weight: 500;
}

.nav-tabs .nav-link.active {
  background-color: #fff;
  border-bottom-color: #fff;
  color: #0d6efd;
}

/* --------------------------------------------------
   Box formule ed esempi
-------------------------------------------------- */

.formula-box {
  background-color: #f8f9fa;
  border-left: 4px solid #0d6efd;
  padding: 15px;
  margin: 15px 0;
}

.example-box {
  background-color: #e9f7fe;
  border-left: 4px solid #17a2b8;
  padding: 15px;
  margin: 15px 0;
}

/* --------------------------------------------------
   Input personalizzati
-------------------------------------------------- */

.input-label {
  font-weight: 600;
  color: #495057;
  margin-bottom: 6px;
  font-size: 0.85rem;
  letter-spacing: 0.2px;
  display: block;
}

.input-group-custom {
  border-radius: 16px;
  overflow: hidden;
  transition: all 0.3s ease;
  background: white;
  border: 1px solid #e9ecef;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
}

.input-group-custom:focus-within {
  border-color: #667eea;
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.1);
}

.input-group-custom .form-control {
  border: none;
  padding: 10px 14px;
  font-size: 0.95rem;
  background: transparent;
}

.input-group-custom .form-control:focus {
  box-shadow: none;
}

.input-group-custom .input-group-text {
  border: none;
  background: #f8f9fa;
  color: #667eea;
  font-weight: 600;
  padding: 10px 14px;
  font-size: 0.9rem;
}

/* --------------------------------------------------
   Input tempo
-------------------------------------------------- */

.time-input-group {
  display: flex;
  gap: 8px;
}

.time-input-wrapper {
  flex: 1;
  position: relative;
}

.time-input-wrapper .form-control {
  border-radius: 12px !important;
  border: 1px solid #e9ecef;
  padding: 10px 6px;
  text-align: center;
  font-weight: 500;
  font-size: 0.9rem;
  height: auto;
}

.time-input-wrapper .form-control:focus {
  border-color: #667eea;
  box-shadow: 0 2px 8px rgba(102, 126, 234, 0.1);
}

.time-input-wrapper label {
  position: absolute;
  top: -8px;
  left: 8px;
  background: white;
  padding: 0 4px;
  font-size: 0.65rem;
  color: #667eea;
  font-weight: 600;
  border-radius: 20px;
  letter-spacing: 0.3px;
}

/* --------------------------------------------------
   Responsive
-------------------------------------------------- */

@media (max-width: 576px) {

  .calculator-card .card-body {
    padding: 1rem;
  }

  .calculator-section {
    padding: 0.75rem;
  }

  .time-input-wrapper .form-control {
    padding: 8px 4px;
    font-size: 0.85rem;
  }

}