.prod-page{display:grid;grid-template-columns:260px 1fr;gap:40px;align-items:start}
@media(max-width:900px){.prod-page{grid-template-columns:1fr} #prod-grid{grid-template-columns:repeat(2,1fr) !important;gap:14px}}
.cat-side{background:var(--bg-2);border:1px solid var(--line);border-radius:10px;padding:14px;position:sticky;top:100px}
.cat-side h4{padding:10px 14px;color:var(--text);font-size:14px;border-bottom:1px solid var(--line);margin-bottom:8px;letter-spacing:1px;font-weight:700}
.cat-side .cat{padding:6px 6px 6px 14px;border-radius:6px;cursor:pointer;font-size:14px;color:var(--text-dim);transition:all .2s;display:flex;justify-content:space-between;align-items:center;gap:4px}
.cat-side .cat:hover{background:var(--bg-soft);color:var(--text)}
.cat-side .cat.active{background:linear-gradient(135deg,var(--blue),var(--accent));color:#fff}
.cat-side .cat.active .cat-name{color:#fff}
.cat-side .cat-name{flex:1;color:inherit;padding:5px 0;display:block}
.cat-side .cat-toggle{width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:transparent;border:none;cursor:pointer;color:inherit;border-radius:4px;flex-shrink:0}
.cat-side .cat-toggle:hover{background:rgba(0,0,0,.06)}
.cat-side .cat-toggle svg{width:16px;height:16px;transition:transform .25s}
.cat-side .cat.open .cat-toggle svg{transform:rotate(90deg)}
.cat-side .sub{overflow:hidden;max-height:0;transition:max-height .3s ease;padding-left:0}
.cat-side .sub.open{max-height:700px}
.cat-side .sub a{display:block;padding:8px 14px 8px 28px;font-size:13px;color:var(--text-dim);transition:color .2s,background .2s;border-radius:4px}
.cat-side .sub a:hover{color:var(--blue);background:var(--bg-soft)}
.cat-side .sub a.active{color:var(--blue);font-weight:600;background:rgba(25,97,184,.08);border-left:3px solid var(--blue);padding-left:25px}
@media(max-width:900px){.cat-side{position:static;padding:10px;margin-bottom:20px}}