cd /opt/shop/html/www
cat > css/sidebar.css <<'CSSEOF'
/* ═══════════════════════════════════════════════════════════
   SHOP ASIDE — static sidebar on desktop, drawer on mobile
   ═══════════════════════════════════════════════════════════ */

.shop-aside {
  position: sticky;
  top: 90px;
  align-self: start;
  max-height: calc(100vh - 110px);
  overflow-y: auto;
  padding-right: .5rem;
  width: 240px;
}
.shop-aside[data-mode="offcanvas"] { display: none; }

.aside-section {
  border-bottom: 1px solid var(--line);
  padding: 1rem 0;
}
.aside-section:first-child { padding-top: 0; }
.aside-section:last-child  { border-bottom: 0; }

.aside-section-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: .95rem;
  letter-spacing: .04em;
  margin-bottom: .75rem;
  color: var(--text);
}

.aside-select {
  width: 100%;
  padding: .5rem .75rem;
  background: var(--bg-surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text);
  font-family: inherit;
  font-size: .85rem;
  outline: none;
}
.aside-select:focus { border-color: var(--gold); }

/* trigger button — hidden on desktop */
.aside-toggle {
  display: none;
  background: transparent;
  border: 0;
  color: var(--text);
  font-size: 1.35rem;
  line-height: 1;
  padding: .25rem .5rem;
  cursor: pointer;
}

.aside-backdrop {
  display: none;
}

/* close button inside the drawer head */
.aside-close {
  background: transparent;
  border: 0;
  color: var(--text-dim);
  font-size: 1.5rem;
  line-height: 1;
  padding: 0 .25rem;
  cursor: pointer;
  display: none;
}

/* ─── mobile: everything becomes a drawer ─────────────── */
@media (max-width: 860px) {
  .aside-toggle { display: inline-flex; align-items: center; }
  .aside-close  { display: inline-block; }

  .shop-aside,
  .shop-aside[data-mode="offcanvas"] {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(320px, 86vw);
    max-height: none;
    width: min(320px, 86vw);
    z-index: 300;
    background: var(--bg-base);
    border-right: 1px solid var(--line);
    padding: 1rem 1.25rem calc(1.25rem + env(safe-area-inset-bottom));
    padding-top: calc(1rem + env(safe-area-inset-top));
    overflow-y: auto;
    transform: translateX(-100%);
    transition: transform .22s ease-out;
    will-change: transform;
  }
  .shop-aside.is-open { transform: translateX(0); }

  .aside-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 290;
    background: rgba(0,0,0,.55);
    opacity: 0;
    pointer-events: none;
    transition: opacity .22s ease-out;
  }
  .aside-backdrop.is-open {
    opacity: 1;
    pointer-events: auto;
  }

  body.is-aside-open { overflow: hidden; }
}

/* grid wrapper used by category.html / search.html */
.aside-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 2rem;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.5rem;
}
@media (max-width: 860px) {
  .aside-layout { grid-template-columns: 1fr; gap: 1rem; padding: 0 .75rem; }
}
CSSEOF