/* Mobile-first */
.calc-form {
  width: 100%;
  padding: 0 16px;
  max-width: 100%;
}

.calc-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 20px;
  color: #212529;
}

.calc-field {
  margin-bottom: 16px;
}

.calc-field label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: #495057;
  font-size: 14px;
}

.calc-input {
  width: 100%;
  min-height: 44px;
  font-size: 16px;
  padding: 0 12px;
  border: 1px solid #ced4da;
  border-radius: 6px;
  background: #fff;
  box-sizing: border-box;
}

.calc-input:focus {
  outline: none;
  border-color: #1976D2;
  box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.1);
}

.calc-field input[type="checkbox"] {
  width: 20px;
  height: 20px;
  margin-right: 8px;
  vertical-align: middle;
}

.calc-btn {
  width: 100%;
  min-height: 48px;
  font-size: 18px;
  font-weight: 600;
  background: #1976D2;
  color: white;
  border: none;
  border-radius: 6px;
  margin-top: 16px;
  cursor: pointer;
  transition: background 0.2s;
}

.calc-btn:hover {
  background: #1565C0;
}

.calc-btn:active {
  background: #0D47A1;
}

.calc-result {
  margin-top: 24px;
  padding: 16px;
  background: #f8f9fa;
  border-radius: 8px;
  border: 1px solid #dee2e6;
}

.calc-result-inner h3 {
  font-size: 24px;
  font-weight: 700;
  color: #1976D2;
  margin-bottom: 16px;
}

.calc-breakdown {
  margin-bottom: 20px;
}

.calc-breakdown p {
  margin: 8px 0;
  font-size: 16px;
  color: #495057;
}

.calc-error {
  color: #dc3545;
  font-weight: 500;
  padding: 12px;
  background: #f8d7da;
  border-radius: 6px;
  border: 1px solid #f5c6cb;
}

.btn-primary {
  display: inline-block;
  padding: 12px 24px;
  background: #28a745;
  color: white;
  text-decoration: none;
  border-radius: 6px;
  font-weight: 600;
  text-align: center;
  transition: background 0.2s;
}

.btn-primary:hover {
  background: #218838;
}

/* Desktop */
@media (min-width: 768px) {
  .calc-form {
    max-width: 600px;
    margin: 0 auto;
    padding: 0;
  }

  .calc-title {
    font-size: 24px;
  }

  .calc-result {
    padding: 24px;
  }

  .calc-result-inner h3 {
    font-size: 28px;
  }
}