/* Category tree styles (externalized) */
#categoryFilters.category-tree{
    display:flex;
    flex-direction:column;
    gap:10px;
}

/* Top-level group (main category) */
.category-tree details.category-group{
    border:1px solid rgba(0,255,255,.10);
    border-radius:14px;
    overflow:hidden;
    background:linear-gradient(135deg, rgba(10,18,28,.90), rgba(8,14,22,.75));
    box-shadow:0 0 0 rgba(0,0,0,0);
}

/* Summary row */
.category-tree details.category-group > summary{
    list-style:none;
    cursor:pointer;
    user-select:none;
    padding:12px 14px;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:10px;
    color:rgba(180,255,255,.95);
    font-weight:700;
    letter-spacing:.2px;
    transition:background .2s ease, transform .2s ease;
}
.category-tree details.category-group > summary::-webkit-details-marker{ display:none; }
.category-tree details.category-group > summary:hover{
    background:rgba(0,255,255,.08);
}
.category-tree details.category-group[open] > summary{
    background:rgba(0,255,255,.06);
}

/* Sub-group (subcategory) */
.category-tree details.subcategory-group{
    margin:8px 10px 10px 10px;
    border:1px solid rgba(255,255,255,.06);
    border-radius:12px;
    overflow:hidden;
    background:rgba(255,255,255,.03);
}
.category-tree details.subcategory-group > summary{
    list-style:none;
    cursor:pointer;
    user-select:none;
    padding:10px 12px;
    color:rgba(230,240,255,.92);
    font-weight:650;
    transition:background .2s ease;
}
.category-tree details.subcategory-group > summary::-webkit-details-marker{ display:none; }
.category-tree details.subcategory-group > summary:hover{
    background:rgba(255,0,255,.06);
}

/* Radio options */
.category-tree label.filter-option{
    display:flex;
    align-items:center;
    gap:10px;
    padding:9px 12px;
    margin:0 10px 10px 10px;
    border-radius:12px;
    cursor:pointer;
    border:1px solid rgba(255,255,255,.06);
    background:rgba(255,255,255,.02);
    transition:background .2s ease, border-color .2s ease, transform .15s ease;
}
.category-tree details.category-group > label.filter-option{
    margin:0 10px 10px 10px;
}
.category-tree label.filter-option:hover{
    background:rgba(0,255,255,.06);
    border-color:rgba(0,255,255,.18);
    transform:translateY(-1px);
}
.category-tree label.filter-option input{
    /* keep accessible but hide */
    appearance:none;
    width:14px; height:14px;
    border-radius:50%;
    border:1px solid rgba(0,255,255,.35);
    background:rgba(0,0,0,.15);
    display:inline-block;
    position:relative;
}
.category-tree label.filter-option input:checked{
    border-color:rgba(0,255,255,.9);
    box-shadow:0 0 10px rgba(0,255,255,.35);
}
.category-tree label.filter-option input:checked::after{
    content:"";
    position:absolute;
    inset:3px;
    border-radius:50%;
    background:rgba(0,255,255,.95);
}
.category-tree label.filter-option span{
    color:rgba(205,220,235,.95);
    line-height:1.2;
}
.category-tree label.filter-option input:checked + span{
    color:#ffffff;
    font-weight:700;
}

/* Indentation for subcategory options */
.category-tree details.subcategory-group > label.filter-option.subcategory{
    margin:0 10px 8px 10px;
    background:rgba(0,0,0,.12);
}