:root {
    --acc-radius: 12px;
    --acc-border: #e6e9ef;
    --acc-bg: #ffffff;
    --acc-hover: #f7f9fc;
    --acc-active: #eef6ff;
}

/* space between items, remove default borders */
.accordion.custom-acc {
    --bs-accordion-border-color: transparent;
    
    padding: 1rem;
    border-radius: 7px;
}

.accordion.custom-acc .accordion-item {
    background: var(--acc-bg);
    border: 1px solid var(--acc-border);
    border-radius: var(--acc-radius);
    overflow: hidden;
    margin-bottom: .75rem;
    box-shadow: 0 1px 2px rgba(16, 24, 40, .04);
    transition: box-shadow .2s ease, border-color .2s ease, transform .15s ease;
}

.accordion.custom-acc .accordion-item:hover {
    border-color: #d5dbe7;
    box-shadow: 0 8px 22px rgba(16, 24, 40, .10);
    transform: translateY(-1px);
}

/* header button */
.accordion.custom-acc .accordion-button {
    background: transparent;
    padding: .9rem 1rem;
    font-weight: 600;
    color: #1f2937;
    /* slate-800 */
    box-shadow: none;
    /* remove default BS shadow line */
}

.accordion.custom-acc .accordion-button:hover {
    background: var(--acc-hover);
}

.accordion.custom-acc .accordion-button:focus {
    border-color: #93c5fd;
    /* blue-300 */
    box-shadow: 0 0 0 .2rem rgba(59, 130, 246, .25);
}

/* active/open state */
.accordion.custom-acc .accordion-button:not(.collapsed) {
    background: var(--acc-active);
    color: #0f172a;
    /* slate-900 */
    border-bottom: 1px solid var(--acc-border);
}

/* body */
.accordion.custom-acc .accordion-body {
    padding: .85rem 1rem 1rem;
}

/* nicer chevron + rotation */
.accordion.custom-acc .accordion-button::after {
    transition: transform .2s ease, filter .2s ease;
    filter: invert(.35) sepia(0) saturate(0) hue-rotate(0deg) brightness(.9);
}

.accordion.custom-acc .accordion-button:not(.collapsed)::after {
    transform: rotate(-180deg);
}

/* optional: compact variant for nested items */
.accordion.custom-acc .accordion-item .accordion-item {
    margin: .5rem .5rem 0;
    border-radius: 10px;
}