/* ════════════════════════════════════════════════════
   KachaBazar — Layout
   Structural chrome: header, nav, footer, sidebar.
   Loaded on every page.
   ════════════════════════════════════════════════════ */

/* ── Header ──────────────────────────────────────── */
.kbz-header {
  height: var(--header-height);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  position: fixed; top: 0; left: 0; right: 0;
  z-index: var(--z-sticky);
  display: flex; align-items: center;
}

/* ── Search Bar ──────────────────────────────────── */
.kbz-search {
  flex: 1; display: flex; align-items: center;
  background: var(--color-bg-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 0 var(--space-4); height: 44px;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.kbz-search:focus-within { border-color: var(--color-primary); background: white; box-shadow: 0 0 0 3px rgba(13,148,136,.15); }
.kbz-search input { flex: 1; border: none; background: transparent; outline: none; font-size: 0.875rem; }
.kbz-search input::placeholder { color: var(--color-text-muted); }

/* Cart/action button in header */
.kbz-cart-btn {
  position: relative; display: flex; align-items: center; gap: var(--space-2);
  padding: var(--space-2) var(--space-3); border-radius: var(--radius-md);
  transition: background var(--t-fast); border: none; cursor: pointer; background: none;
}
.kbz-cart-btn:hover { background: var(--color-bg-muted); }
.kbz-cart-badge {
  position: absolute; top: -4px; right: -4px; background: var(--color-primary); color: white;
  font-size: 10px; font-weight: 700; min-width: 18px; height: 18px; border-radius: var(--radius-full);
  display: flex; align-items: center; justify-content: center; padding: 0 4px;
}

/* ── Secondary Nav ──────────────────────────────── */
.kbz-subnav {
  height: var(--subnav-height);
  background: white;
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 1px 3px rgba(0,0,0,.04);
  position: fixed; top: var(--header-height); left: 0; right: 0;
  z-index: calc(var(--z-sticky) - 5);
  display: flex; align-items: center;
}
.kbz-subnav-link {
  font-size: 0.8125rem; font-weight: 500; color: var(--color-gray-700);
  padding: 0 12px; height: var(--subnav-height);
  display: flex; align-items: center;
  border-bottom: 2px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
  white-space: nowrap; text-decoration: none;
}
.kbz-subnav-link:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.kbz-subnav-link.flash { color: var(--color-hot); }

/* ── Left Sidebar (category/shop pages) ─────────── */
.kbz-sidebar {
  width: var(--sidebar-width); background: var(--color-bg);
  border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  overflow: hidden; box-shadow: var(--shadow-sm);
  position: sticky; top: calc(var(--header-height) + var(--subnav-height) + 20px);
  align-self: flex-start;
}
.kbz-sidebar__head {
  background: var(--color-primary); color: white;
  padding: var(--space-4) var(--space-5);
  display: flex; align-items: center; gap: var(--space-3);
  font-weight: 700; font-size: 0.875rem; letter-spacing: .03em; text-transform: uppercase;
}
.kbz-sidebar__item {
  display: flex; align-items: center; gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  cursor: pointer; transition: background var(--t-fast), color var(--t-fast);
  border-left: 3px solid transparent;
}
.kbz-sidebar__item:hover,.kbz-sidebar__item.active {
  background: var(--color-primary-50); color: var(--color-primary); border-left-color: var(--color-primary);
}
.kbz-sidebar__item img { width: 22px; height: 22px; object-fit: contain; }
.kbz-sidebar__label { font-size: 0.875rem; font-weight: 500; flex: 1; }

/* ── Footer ─────────────────────────────────────── */
.kbz-footer { background: var(--color-gray-900); color: var(--color-gray-300); }
.kbz-footer__top { padding: var(--space-12) 0 var(--space-8); }
.kbz-footer__grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr 1.1fr; gap: 36px; }
.kbz-footer__head {
  font-family: var(--font-display); font-size: 0.75rem; font-weight: 800;
  color: white; letter-spacing: .1em; text-transform: uppercase; margin-bottom: var(--space-4);
}
.kbz-footer__links { display: flex; flex-direction: column; gap: var(--space-2); }
.kbz-footer__links a { font-size: 0.875rem; color: var(--color-gray-400); transition: color var(--t-fast), padding-left var(--t-fast); }
.kbz-footer__links a:hover { color: var(--color-primary-300); padding-left: var(--space-1); }
.kbz-footer__bottom { border-top: 1px solid var(--color-gray-800); padding: 18px 0; }
.kbz-footer__copy { font-size: 0.75rem; color: var(--color-gray-500); }
.kbz-social-link {
  width: 36px; height: 36px; border-radius: 50%;
  border: 1px solid var(--color-gray-700); display: flex; align-items: center; justify-content: center;
  color: var(--color-gray-400); transition: background var(--t-fast), color var(--t-fast), border-color var(--t-fast);
  text-decoration: none;
}
.kbz-social-link:hover { background: var(--color-primary); border-color: var(--color-primary); color: white; }

/* ── Mobile Sidebar ─────────────────────────────── */
.kbz-mob-sidebar {
  position: fixed; top: 0; left: -300px; bottom: 0; width: 280px;
  background: white; z-index: var(--z-modal); transition: left var(--t-slow);
  overflow-y: auto; box-shadow: var(--shadow-xl);
}
.kbz-mob-sidebar.open { left: 0; }
.kbz-mob-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.4);
  z-index: var(--z-overlay); opacity: 0; pointer-events: none; transition: opacity var(--t-slow);
}
.kbz-mob-overlay.active { opacity: 1; pointer-events: all; }
.kbz-hamburger { display: none; }

/* ── Responsive ─────────────────────────────────── */
@media (max-width: 1024px) { .kbz-footer__grid { grid-template-columns: 1fr 1fr 1fr; } }
@media (max-width: 768px)  {
  .kbz-hamburger { display: flex !important; }
  .kbz-grid-sidebar { grid-template-columns: 1fr; }
  .kbz-sidebar { display: none; }
  .kbz-footer__grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .kbz-subnav-right { display: none; }
}
@media (max-width: 480px)  { .kbz-footer__grid { grid-template-columns: 1fr; } }