/* ============================================================
   NariTales India — Glass System (Luxury Dark Theme)
   Frosted glass utilities for elevated surfaces
   ============================================================ */

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow), var(--glass-highlight);
}

.glass-strong {
  background: var(--glass-bg-strong);
  backdrop-filter: blur(28px) saturate(200%);
  -webkit-backdrop-filter: blur(28px) saturate(200%);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow), var(--glass-highlight);
}

.glass-elevated {
  background: var(--glass-bg-strong);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
}

.glass-tinted {
  background: rgba(246, 226, 166, 0.1);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--brand-gold-muted);
  box-shadow: var(--glass-shadow);
}

/* Scroll-driven: JS adds `.is-scrolled` to topbar */
[data-topbar].is-scrolled,
.desktop-header.is-scrolled,
.mobile-header.is-scrolled {
  background: var(--glass-bg-strong);
  backdrop-filter: blur(28px) saturate(200%);
  -webkit-backdrop-filter: blur(28px) saturate(200%);
  border-bottom-color: var(--glass-border);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
  transition: background var(--duration-base) var(--ease-out),
              box-shadow var(--duration-base) var(--ease-out);
}

/* Safari fallback */
@supports not (backdrop-filter: blur(1px)) {
  .glass,
  .glass-strong,
  .glass-elevated {
    background: var(--surface-raised);
  }
}