/**
 * AKSRT Overlay / Glass Primitives
 *
 * Provides backdrop-filter glass surfaces used by header, footer-tabbar,
 * floating buttons and search overlays — matching zibll's blur system.
 *
 * @package AKSRT
 */

/* ============================================================
 * .aksrt-blur-bg — generic glass surface
 * Use on any element that needs a translucent blurred background.
 * ============================================================ */
.aksrt-blur-bg {
  -webkit-backdrop-filter: saturate(5) blur(20px);
  backdrop-filter: saturate(5) blur(20px);
  background: var(--blur-bg);
}

/* ============================================================
 * Glass on site-nav (when using fixed/sticky mode)
 * Applied via .site-nav--blur already; this adds the zibll-grade
 * saturate(5) blur(20px) instead of the lighter saturate(1.5) blur(18px).
 * ============================================================ */
.site-nav--glass {
  -webkit-backdrop-filter: saturate(5) blur(20px);
  backdrop-filter: saturate(5) blur(20px);
  background: var(--blur-bg);
  border-bottom-color: transparent;
}

.site-nav--glass.is-scrolled {
  box-shadow: 0 4px 10px rgba(20, 28, 48, 0.06);
  border-bottom-color: var(--color-line-soft);
}

html.dark .site-nav--glass.is-scrolled,
html.dark .site-nav--glass.is-scrolled {
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.25);
}

/* ============================================================
 * Glass on footer-tabbar (already uses backdrop-filter in footer.css;
 * this class can be toggled to match zibll's exact blur spec)
 * ============================================================ */
.footer-tabbar--glass {
  -webkit-backdrop-filter: saturate(5) blur(20px);
  backdrop-filter: saturate(5) blur(20px);
  background: var(--blur-bg);
  box-shadow: 0 -4px 5px rgba(20, 28, 48, 0.06);
}

html.dark .footer-tabbar--glass,
html.dark .footer-tabbar--glass {
  box-shadow: 0 -4px 5px rgba(0, 0, 0, 0.25);
}

/* ============================================================
 * Glass on floating buttons (lighter blur: saturate(2) blur(10px))
 * ============================================================ */
.float-right--glass .float-btn {
  -webkit-backdrop-filter: saturate(2) blur(10px);
  backdrop-filter: saturate(2) blur(10px);
  background: var(--float-btn-bg);
  border-color: transparent;
}

/* ============================================================
 * Scroll shadow on glass header (zibll: .body-scroll .header)
 * ============================================================ */
body.has-scrolled .site-nav--glass {
  box-shadow: 0 4px 10px rgba(20, 28, 48, 0.06);
}

html.dark body.has-scrolled .site-nav--glass,
html.dark body.has-scrolled .site-nav--glass {
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.25);
}