/* ==========================================================================
   SolidW — Liquid Glass
   Real frosted glass, the way it reads in the reference shots: transparency
   + blur + ONE soft specular highlight + ONE soft ink-toned shadow. No
   layered color-tinted sheens, no mix-blend-mode stacking — that's what
   made the old version look muddy/dated. Every value here is either a
   design token or physical white/black light at low opacity.

   USAGE (unchanged)
   <div class="liquid-glass">...</div>
   <div class="liquid-glass liquid-glass--dark">...</div>
   <div class="liquid-glass liquid-glass--pill">...</div>
   <button class="btn btn-glass">...</button>
   <div class="glass-dropdown">...</div>
   <div class="glass-tabs"><button class="glass-tab">…</button></div>
   ========================================================================== */

@supports not (backdrop-filter: blur(1px)) {
  .liquid-glass,
  .btn-glass,
  .glass-dropdown,
  .glass-tabs,
  .modal {
    background-color: var(--color-paper) !important;
  }
}

.liquid-glass {
  position: relative;
  isolation: isolate;
  background: var(--glass-light-bg);
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  border: 1px solid var(--glass-light-border);
  border-radius: var(--radius-lg);
  box-shadow:
    var(--shadow-lg),
    inset 0 1px 0 var(--sheen-light),
    inset 0 -12px 20px -14px var(--sheen-shadow);
  transition: transform var(--duration-glass) var(--ease-glass),
              box-shadow var(--duration-glass) var(--ease-glass),
              border-color var(--duration-base) var(--ease-standard);
}

/* Single specular highlight — a soft light arc top-left, nothing else */
.liquid-glass::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  border-radius: inherit;
  background: linear-gradient(
    150deg,
    var(--sheen-light) 0%,
    transparent 35%
  );
  opacity: 0.5;
  pointer-events: none;
}

.liquid-glass > * {
  position: relative;
  z-index: 2;
}

.liquid-glass:hover {
  transform: translateY(-2px);
  box-shadow:
    var(--shadow-xl),
    inset 0 1px 0 var(--sheen-light),
    inset 0 -12px 20px -14px var(--sheen-shadow);
}

.liquid-glass:active {
  transform: translateY(0) scale(0.995);
  transition-duration: var(--duration-fast);
}

/* ---------- Modifiers ---------- */

.liquid-glass--dark {
  background: var(--glass-dark-bg);
  border-color: var(--glass-dark-border);
  color: var(--color-navy-text);
  box-shadow:
    var(--shadow-lg),
    inset 0 1px 0 var(--glass-dark-highlight),
    inset 0 -12px 20px -14px rgba(0, 0, 0, 0.25);
}
.liquid-glass--dark::before {
  background: linear-gradient(
    150deg,
    rgba(255, 255, 255, 0.16) 0%,
    transparent 35%
  );
  opacity: 0.7;
}
.liquid-glass--dark:hover {
  box-shadow:
    var(--shadow-xl),
    inset 0 1px 0 var(--glass-dark-highlight),
    inset 0 -12px 20px -14px rgba(0, 0, 0, 0.3);
}

.liquid-glass--flat {
  transform: none !important;
}
.liquid-glass--flat:hover {
  transform: none !important;
}

.liquid-glass--pill {
  border-radius: var(--radius-full);
}

.liquid-glass--sm {
  border-radius: var(--radius-md);
  backdrop-filter: blur(var(--glass-blur-sm)) saturate(var(--glass-saturate));
  -webkit-backdrop-filter: blur(var(--glass-blur-sm)) saturate(var(--glass-saturate));
}

.liquid-glass--lg {
  border-radius: var(--radius-xl);
  backdrop-filter: blur(var(--glass-blur-lg)) saturate(var(--glass-saturate));
  -webkit-backdrop-filter: blur(var(--glass-blur-lg)) saturate(var(--glass-saturate));
}

/* ==========================================================================
   Glass Button — like the "Apple Pay" pill: solid-reading dark glass, clean
   top highlight, soft grounded shadow. Composes with .btn / .btn-primary.
   ========================================================================== */
.btn-glass {
  position: relative;
  isolation: isolate;
  background: var(--glass-dark-bg);
  backdrop-filter: blur(var(--glass-blur-sm)) saturate(var(--glass-saturate));
  -webkit-backdrop-filter: blur(var(--glass-blur-sm)) saturate(var(--glass-saturate));
  border: 1px solid var(--glass-dark-border);
  color: var(--color-navy-text);
  border-radius: var(--radius-full);
  box-shadow:
    var(--shadow-md),
    inset 0 1px 0 var(--glass-dark-highlight);
  transition: background-color var(--duration-base) var(--ease-glass),
              border-color var(--duration-base) var(--ease-glass),
              transform var(--duration-fast) var(--ease-standard),
              box-shadow var(--duration-base) var(--ease-glass);
}
.btn-glass:hover {
  background: color-mix(in srgb, var(--color-navy-1) 55%, transparent);
  border-color: rgba(255, 255, 255, 0.22);
  box-shadow: var(--shadow-lg), inset 0 1px 0 var(--glass-dark-highlight);
  transform: translateY(-1px);
}
.btn-glass:active {
  transform: translateY(0) scale(0.98);
}

/* Light variant — glass button sitting on the light --color-paper surface */
.btn-glass--light {
  background: var(--glass-light-bg);
  border-color: var(--glass-light-border);
  color: var(--color-text);
  box-shadow: var(--shadow-sm), inset 0 1px 0 var(--glass-light-highlight);
}
.btn-glass--light:hover {
  background: rgba(255, 255, 255, 0.65);
  border-color: rgba(255, 255, 255, 0.85);
  box-shadow: var(--shadow-md), inset 0 1px 0 var(--glass-light-highlight);
}

/* ==========================================================================
   Glass Card
   ========================================================================== */
.card-glass {
  background: var(--glass-light-bg);
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  border: 1px solid var(--glass-light-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md), inset 0 1px 0 var(--sheen-light);
}

/* ==========================================================================
   Glass Dropdown
   ========================================================================== */
.glass-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 180px;
  padding: var(--space-2);
  background: color-mix(in srgb, var(--color-paper) 90%, transparent);
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  border: 1px solid var(--glass-light-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg), inset 0 1px 0 var(--sheen-light);
  z-index: var(--z-dropdown);
  transform-origin: top right;
  animation: glassDropdownIn var(--duration-base) var(--ease-glass) both;
}

@keyframes glassDropdownIn {
  from { opacity: 0; transform: scale(0.96) translateY(-4px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

.glass-dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  color: var(--color-text);
  text-align: left;
  background: transparent;
  transition: background-color var(--duration-fast) var(--ease-standard);
}
.glass-dropdown-item:hover { background-color: var(--color-ink-soft); }
.glass-dropdown-item.danger { color: var(--color-danger); }
.glass-dropdown-item.danger:hover { background-color: color-mix(in srgb, var(--color-danger) 10%, transparent); }

/* ==========================================================================
   Glass Tabs
   ========================================================================== */
.glass-tabs {
  display: inline-flex;
  gap: var(--space-1);
  padding: var(--space-1);
  border-radius: var(--radius-full);
  background: var(--glass-light-bg);
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-saturate));
  border: 1px solid var(--glass-light-border);
  box-shadow: var(--shadow-md), inset 0 1px 0 var(--sheen-light);
  max-width: 100%;
  overflow-x: auto;
}

.glass-tab {
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-full);
  background-color: transparent !important;
  color: var(--color-text-muted) !important;
  font-weight: var(--fw-medium);
  font-size: var(--fs-sm);
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
  transition: background-color var(--duration-fast) var(--ease-standard),
              color var(--duration-fast) var(--ease-standard);
}
.glass-tab:hover { color: var(--color-text) !important; }
.glass-tab.active {
  background-color: var(--color-ink) !important;
  color: var(--color-paper) !important;
  box-shadow: var(--shadow-sm);
}

@media (prefers-reduced-motion: reduce) {
  .liquid-glass,
  .liquid-glass::before,
  .glass-dropdown {
    animation: none !important;
    transition: none !important;
  }
}