:root {
  --bs-body-color: #212529;
  --bs-body-bg: #fff;
  --bs-border: #ced4da;
  --bs-primary: #0d6efd;
  --bs-danger: #dc3545;
  --bs-success: #198754;
  --bs-muted: #6c757d;
  --radius: 0.375rem;
  --focus-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

/* Validation feedback */
.invalid-feedback {
  display: none;
  width: 100%;
  margin-top: 0.25rem;
  font-size: 0.875rem;
  color: var(--bs-danger);
}

/* Mostrar quando JS adiciona is-invalid */
.form-control.is-invalid + .invalid-feedback {
  display: block;
}

.form-control.is-invalid {
  border-color: var(--bs-danger);
  padding-right: calc(1.5em + 0.75rem);
  background-repeat: no-repeat;
  background-position: right calc(0.375em + 0.1875rem) center;
  background-size: calc(0.75em + 0.375rem) calc(0.75em + 0.375rem);
}

/* Layout helpers */
.form-group {
  margin-bottom: 1rem;
}

/* Inputs */
.form-control {
  display: block;
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--bs-body-color);
  background-color: #fff;
  background-clip: padding-box;
  border: 1px solid var(--bs-border);
  appearance: none;
  border-radius: var(--radius);
  transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}
.form-control:focus {
  color: var(--bs-body-color);
  background-color: #fff;
  border-color: #86b7fe;
  outline: 0;
  box-shadow: var(--focus-shadow);
}
.form-control::placeholder {
  color: #6c757d;
  opacity: 1;
}
.form-control:disabled,
.form-control[readonly] {
  background-color: #e9ecef;
  opacity: 1;
}

/* Input group */
.input-group {
  position: relative;
  display: flex;
  flex-wrap: nowrap;
  align-items: stretch;
  width: 100%;
}
.input-group > .form-control {
  flex: 1 1 auto;
  width: 1%;
  margin-bottom: 0;
}
.input-group-prepend {
  display: flex;
}
.input-group-text {
  display: flex;
  align-items: center;
  padding: 0.5rem 0.75rem;
  margin-right: -1px;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: #495057;
  text-align: center;
  white-space: nowrap;
  background-color: #e9ecef;
  border: 1px solid var(--bs-border);
  border-top-left-radius: var(--radius);
  border-bottom-left-radius: var(--radius);
}

/* Buttons */
.btn {
  display: inline-block;
  font-weight: 600;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  user-select: none;
  border: 1px solid transparent;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  border-radius: var(--radius);
  transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out,
    border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}
.btn:focus {
  outline: 0;
  box-shadow: var(--focus-shadow);
}
.btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}
.btn-primary {
  color: #fff;
  background-color: var(--bs-primary);
  border-color: var(--bs-primary);
}
.btn-primary:hover {
  background-color: #0b5ed7;
  border-color: #0a58ca;
}
.btn-danger {
  color: #fff;
  background-color: var(--bs-danger);
  border-color: var(--bs-danger);
}
.btn-danger:hover {
  background-color: #bb2d3b;
  border-color: #b02a37;
}
.btn-outline-primary {
  color: var(--bs-primary);
  background-color: transparent;
  border-color: var(--bs-primary);
}
.btn-outline-primary:hover {
  color: #fff;
  background-color: var(--bs-primary);
}
