#voucher_course_form{
    --voucher-accent: #3e64de;
    --voucher-accent-hover: #2f4fb8;
    --voucher-border: #d1d5db;
    --voucher-text: #1f2937;
    --voucher-muted: #4b5563;
    --voucher-error: #dc2626;

    display: flex;
    flex-direction: column;
    max-width: 480px;
    margin: 0 auto 2rem;
    padding: 2rem;
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
    box-sizing: border-box;
}

#voucher_course_form label{
    margin-bottom: 0.375rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--voucher-muted);
}

#voucher_course_form .voucher-source{
    margin: 0 0 1.5rem;
    padding: 0;
    border: none;
    min-width: 0;
}

#voucher_course_form .voucher-source legend{
    margin-bottom: 0.5rem;
    padding: 0;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--voucher-muted);
}

#voucher_course_form .voucher-source__options{
    display: flex;
    gap: 0.25rem;
    padding: 0.25rem;
    background: #f3f4f6;
    border-radius: 10px;
}

#voucher_course_form .voucher-source__option{
    position: relative;
    flex: 1;
    margin: 0;
}

/* Visually hidden but still focusable and announced by screen readers */
#voucher_course_form .voucher-source__option input{
    position: absolute;
    opacity: 0;
    width: 1px;
    height: 1px;
    margin: 0;
}

#voucher_course_form .voucher-source__option span{
    display: block;
    padding: 0.625rem 0.75rem;
    font-size: 0.9375rem;
    font-weight: 600;
    text-align: center;
    color: var(--voucher-muted);
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

#voucher_course_form .voucher-source__option span:hover{
    color: var(--voucher-text);
}

#voucher_course_form .voucher-source__option input:checked + span{
    color: var(--voucher-accent);
    background: #fff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

#voucher_course_form .voucher-source__option input:focus-visible + span{
    outline: 3px solid rgba(62, 100, 222, 0.4);
    outline-offset: 2px;
}

#voucher_course_form .voucher-fields{
    display: flex;
    flex-direction: column;
}

/* display:flex above would otherwise override the hidden attribute */
#voucher_course_form .voucher-fields[hidden]{
    display: none;
}

#voucher_course_form input[type="text"]{
    width: 100%;
    margin: 0 0 1.25rem;
    padding: 0.75rem 0.875rem;
    font-size: 1rem;
    color: var(--voucher-text);
    background: #fff;
    border: 1px solid var(--voucher-border);
    border-radius: 8px;
    box-sizing: border-box;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

#voucher_course_form input[type="text"]:focus{
    outline: none;
    border-color: var(--voucher-accent);
    box-shadow: 0 0 0 3px rgba(62, 100, 222, 0.2);
}

#voucher_course_form input.voucher-field-error{
    border-color: var(--voucher-error);
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.15);
}

#voucher_course_form input[type="submit"]{
    margin-top: 0.5rem;
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    text-transform: capitalize;
    color: #fff;
    background: var(--voucher-accent);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.15s ease;
}

#voucher_course_form input[type="submit"]:hover,
#voucher_course_form input[type="submit"]:focus-visible{
    background: var(--voucher-accent-hover);
}

#voucher_course_form input[type="submit"]:focus-visible{
    outline: 3px solid rgba(62, 100, 222, 0.4);
    outline-offset: 2px;
}

#voucher_course_form input[type="submit"]:disabled{
    opacity: 0.6;
    cursor: not-allowed;
}

.voucher-message{
    max-width: 480px;
    margin: 0 auto 1rem;
    padding: 0.875rem 1rem;
    font-size: 0.9375rem;
    border-radius: 8px;
    border: 1px solid transparent;
    box-sizing: border-box;
}

.voucher-message--error{
    color: #991b1b;
    background: #fef2f2;
    border-color: #fecaca;
}

.voucher-message--success{
    color: #166534;
    background: #f0fdf4;
    border-color: #bbf7d0;
}

@media (max-width: 520px){
    #voucher_course_form{
        padding: 1.25rem;
        border-radius: 8px;
    }
}