/* ============================================================
   FileDrop — Frosted Glass Theme (glassmorphism)
   Shared across all pages. Load AFTER each page's <style>.
   ============================================================ */

:root {
  /* Glass surfaces — translucent with blur */
  --glass-bg: rgba(255, 255, 255, 0.06);
  --glass-bg-hover: rgba(255, 255, 255, 0.09);
  --glass-bg-strong: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.12);
  --glass-border-strong: rgba(255, 255, 255, 0.2);
  --glass-highlight: rgba(255, 255, 255, 0.5);
  --glass-blur: 20px;
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.37);
  --glass-shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.45);
}

/* ===== Base glass card ===== */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(140%);
  border: 1px solid var(--glass-border);
  box-shadow:
    var(--glass-shadow),
    inset 0 1px 0 0 rgba(255, 255, 255, 0.08);
  position: relative;
}

/* Top edge highlight — the signature glass shine */
.glass::after {
  content: '';
  position: absolute;
  top: 0;
  left: 10%;
  right: 10%;
  height: 1px;
  background: linear-gradient(90deg,
    transparent,
    var(--glass-highlight),
    transparent);
  opacity: 0.4;
  pointer-events: none;
  border-radius: inherit;
}

.glass-strong {
  background: var(--glass-bg-strong);
  backdrop-filter: blur(28px) saturate(160%);
  -webkit-backdrop-filter: blur(28px) saturate(160%);
  border: 1px solid var(--glass-border-strong);
  box-shadow:
    var(--glass-shadow-lg),
    inset 0 1px 0 0 rgba(255, 255, 255, 0.12);
  position: relative;
}

.glass-strong::after {
  content: '';
  position: absolute;
  top: 0;
  left: 8%;
  right: 8%;
  height: 1px;
  background: linear-gradient(90deg,
    transparent,
    rgba(255,255,255,0.6),
    transparent);
  opacity: 0.5;
  pointer-events: none;
  border-radius: inherit;
}

/* ===== Vibrant gradient backdrop (visible through glass) ===== */
.glass-backdrop {
  position: fixed;
  inset: 0;
  z-index: -3;
  overflow: hidden;
  background: #0a0d12;
}

.glass-backdrop span {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.5;
  will-change: transform;
}

.glass-backdrop .blob-1 {
  width: 45vmax; height: 45vmax;
  background: radial-gradient(circle, rgba(99, 152, 255, 0.5), transparent 70%);
  top: -15vmax; left: -10vmax;
  animation: glass-blob-1 26s ease-in-out infinite;
}

.glass-backdrop .blob-2 {
  width: 40vmax; height: 40vmax;
  background: radial-gradient(circle, rgba(168, 120, 255, 0.45), transparent 70%);
  bottom: -15vmax; right: -10vmax;
  animation: glass-blob-2 30s ease-in-out infinite;
}

.glass-backdrop .blob-3 {
  width: 35vmax; height: 35vmax;
  background: radial-gradient(circle, rgba(80, 220, 200, 0.35), transparent 70%);
  top: 40%; left: 50%;
  animation: glass-blob-3 34s ease-in-out infinite;
}

@keyframes glass-blob-1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(10vmax, 8vmax) scale(1.15); }
  66% { transform: translate(-6vmax, 12vmax) scale(0.9); }
}

@keyframes glass-blob-2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-12vmax, -10vmax) scale(1.2); }
}

@keyframes glass-blob-3 {
  0%, 100% { transform: translate(-50%, 0) scale(1); }
  50% { transform: translate(-30%, -8vmax) scale(1.1); }
}

/* ===== Glass hover lift ===== */
.glass-hover {
  transition:
    background 0.25s ease,
    border-color 0.25s ease,
    transform 0.25s cubic-bezier(0.16, 1, 0.3, 1),
    box-shadow 0.25s ease;
}

.glass-hover:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-strong);
  transform: translateY(-2px);
  box-shadow: var(--glass-shadow-lg), inset 0 1px 0 0 rgba(255,255,255,0.12);
}

/* ===== Reduced motion ===== */
@media (prefers-reduced-motion: reduce) {
  .glass-backdrop span { animation: none !important; }
  .glass-hover:hover { transform: none; }
}

/* ===== Fallback for browsers without backdrop-filter ===== */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .glass, .glass-strong {
    background: rgba(22, 28, 36, 0.92);
  }
}