.tf-form-group {
    display: flex;
    flex-direction: column;
    gap: var(--tf-space-2);
    margin-bottom: var(--tf-space-4);
    width: 100%;
    box-sizing: border-box;
}

.tf-label {
    font-size: var(--tf-font-size-sm);
    font-weight: var(--tf-font-weight-medium);
    color: var(--tf-text-main);
}

.tf-form {
    display: grid;
    gap: var(--tf-space-4);
}

.tf-input,
.tf-select,
.tf-textarea {
    width: 100%;
    padding: 0 0.9rem;
    background: var(--tf-input-bg);
    border: var(--tf-input-border);
    color: var(--tf-input-color);
    border-radius: var(--tf-input-radius);
    transition: all 0.12s ease;
    font-family: var(--tf-font-family-base);
    font-size: var(--tf-font-size-base);
    box-sizing: border-box;
}

.tf-input::placeholder,
.tf-textarea::placeholder {
    color: var(--tf-input-placeholder-color);
    opacity: 1;
}

.tf-select:required:invalid {
    color: var(--tf-input-placeholder-color);
}

.tf-select option {
    color: var(--tf-input-color);
}

.tf-input,
.tf-select {
    height: var(--tf-input-height);
    display: inline-flex;
    align-items: center;
}

.tf-textarea {
    min-height: 110px;
    padding-top: var(--tf-space-3);
    padding-bottom: var(--tf-space-3);
    resize: vertical;
}

.tf-input:focus,
.tf-select:focus,
.tf-textarea:focus {
    outline: none;
    border-color: var(--tf-input-focus-border-color);
    box-shadow: var(--tf-input-focus-shadow);
}

.tf-input:hover:not(:disabled):not([readonly]),
.tf-select:hover:not(:disabled):not([readonly]),
.tf-textarea:hover:not(:disabled):not([readonly]) {
    border-color: var(--tf-input-hover-border-color);
}

.tf-input:disabled,
.tf-select:disabled,
.tf-textarea:disabled,
.tf-input[readonly],
.tf-select[readonly],
.tf-textarea[readonly] {
    background: var(--tf-input-disabled-bg);
    color: var(--tf-input-disabled-color);
    cursor: not-allowed;
    opacity: 1;
}

.tf-checkbox,
.tf-radio {
    width: 1rem;
    height: 1rem;
    accent-color: var(--tf-color-primary);
}

.tf-field-error {
    margin-top: var(--tf-space-1);
    color: var(--tf-color-danger);
    font-size: var(--tf-font-size-sm);
}

.tf-required::after {
    content: "*";
    color: var(--tf-color-danger);
    margin-inline-start: var(--tf-space-1);
}

/* horizontal form row: labels and inputs side-by-side */
.tf-form-row {
    display: flex;
    gap: var(--tf-space-3);
    align-items: center;
}

.tf-form-row .tf-form-group {
    margin-bottom: 0
}

.tf-form-row .tf-label {
    min-width: 140px
}

/* small input */
.tf-input-sm,
.tf-select-sm {
    height: calc(var(--tf-input-height) - 8px);
    font-size: var(--tf-font-size-sm);
    padding: 0 .6rem
}