/* ── Inputs ── */
.input-group-custom {
    margin-bottom: 16px;
    position: relative;
}

.input-group-custom .form-control {
    width: 100%;
    border: 1.5px solid #ddd;
    border-radius: 8px;
    padding: 12px 14px;
    font-size: 15px;
    transition: border-color 0.25s, box-shadow 0.25s;
    -webkit-appearance: none; /* fix iOS */
}

.input-group-custom .form-control:focus {
    outline: none;
    border-color: #4a90e2;
    box-shadow: 0 0 0 3px rgba(74,144,226,0.15);
}

/* Estado válido */
.input-group-custom .form-control.is-valid {
    border-color: #28a745;
}

/* Estado inválido */
.input-group-custom .form-control.is-invalid {
    border-color: #e74c3c;
    box-shadow: 0 0 0 3px rgba(231,76,60,0.1);
}

/* Mensajes de error */
.error-msg {
    display: none;
    font-size: 12px;
    color: #e74c3c;
    margin-top: 4px;
    transition: opacity 0.2s;
}

.error-msg.visible {
    display: block;
}

/* Footer del textarea */
.textarea-footer {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-top: 4px;
}

.char-counter {
    font-size: 11px;
    color: #999;
    white-space: nowrap;
    margin-left: 8px;
}

.char-counter.limit-near  { color: #e67e22; }
.char-counter.limit-reached { color: #e74c3c; }

/* Botón deshabilitado */
#submitBtn:disabled {
    opacity: 0.65;
    cursor: not-allowed;
}

/* ── Responsive: una columna en móvil ── */
@media (max-width: 575px) {
    .modal-dialog {
        margin: 10px;
    }
    .input-group-custom .form-control {
        font-size: 16px; /* evita zoom automático en iOS */
        padding: 13px 12px;
    }
}