/* ── Gradient heading ── */
.gradient-heading {
  background: linear-gradient(135deg, #f8fafc 0%, #c7d2fe 35%, #a5b4fc 55%, #818cf8 75%, #c4b5fd 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 0 30px rgba(129, 140, 248, 0.25));
}

/* ── Glass card ── */
.glass-card {
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow:
    0 0 0 1px rgba(99, 102, 241, 0.06) inset,
    0 4px 24px rgba(0, 0, 0, 0.35),
    0 0 48px rgba(99, 102, 241, 0.12),
    0 0 80px rgba(139, 92, 246, 0.06);
}

/* ── Generate button ── */
.generate-btn {
  background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #7c3aed 100%);
  box-shadow:
    0 4px 20px rgba(99, 102, 241, 0.45),
    0 0 40px rgba(139, 92, 246, 0.2);
  animation: pulseGlow 2.5s ease-in-out infinite;
}

.generate-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, transparent 0%, rgba(255, 255, 255, 0.15) 50%, transparent 100%);
  transform: translateX(-100%);
  transition: transform 0.5s ease;
}

.generate-btn:hover:not(:disabled)::before {
  transform: translateX(100%);
}

.generate-btn:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow:
    0 6px 28px rgba(99, 102, 241, 0.55),
    0 0 56px rgba(139, 92, 246, 0.35);
}

.generate-btn:active:not(:disabled) {
  transform: translateY(0);
}

/* ── Preview wrapper ── */
.preview-wrapper {
  border: 2px dashed rgba(148, 163, 184, 0.25);
  background: rgba(0, 0, 0, 0.2);
  transition: border-color 0.3s ease;
}

.preview-wrapper.is-loading {
  border-color: rgba(99, 102, 241, 0.35);
}

.preview-wrapper.has-image {
  border-style: solid;
  border-color: rgba(99, 102, 241, 0.2);
}

/* ── Spinner ── */
.spinner {
  width: 44px;
  height: 44px;
  border: 3px solid rgba(148, 163, 184, 0.2);
  border-top-color: #818cf8;
  border-right-color: #a78bfa;
  border-radius: 50%;
  animation: spin 0.85s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── Skeleton shimmer bar ── */
.skeleton-shimmer {
  background: linear-gradient(
    90deg,
    rgba(148, 163, 184, 0.1) 0%,
    rgba(129, 140, 248, 0.35) 50%,
    rgba(148, 163, 184, 0.1) 100%
  );
  background-size: 200% 100%;
  animation: shimmer 1.8s ease-in-out infinite;
}

/* ── Aspect ratio cards ── */
.ratio-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.125rem;
  padding: 0.75rem 0.5rem;
  border-radius: 0.75rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
  color: #94a3b8;
  transition: all 0.2s ease;
}

.ratio-option:hover .ratio-card {
  border-color: rgba(129, 140, 248, 0.3);
  background: rgba(99, 102, 241, 0.08);
  color: #c7d2fe;
}

.ratio-card--active,
.peer:checked ~ .ratio-card {
  border-color: rgba(129, 140, 248, 0.5);
  background: rgba(99, 102, 241, 0.15);
  color: #e0e7ff;
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.2);
}

/* ── Custom toggle ── */
.toggle-track {
  position: relative;
  flex-shrink: 0;
  width: 44px;
  height: 24px;
  border-radius: 9999px;
  background: rgba(51, 65, 85, 0.8);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: background 0.25s ease, box-shadow 0.25s ease;
}

.toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #94a3b8;
  transition: transform 0.25s ease, background 0.25s ease;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.toggle-input:checked + .toggle-track {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  box-shadow: 0 0 16px rgba(99, 102, 241, 0.4);
}

.toggle-input:checked + .toggle-track .toggle-thumb {
  transform: translateX(20px);
  background: #fff;
}

.toggle-input:focus-visible + .toggle-track {
  outline: 2px solid rgba(129, 140, 248, 0.6);
  outline-offset: 2px;
}

/* ── Accordion panel (grid trick for smooth height) ── */
.accordion-panel {
  grid-template-rows: 0fr;
}

.accordion-panel.is-open {
  grid-template-rows: 1fr;
}

#accordion-toggle[aria-expanded='true'] #accordion-chevron {
  transform: rotate(180deg);
}

/* ── Image visible state ── */
#result-image.is-visible {
  opacity: 1;
}