/* Two Image Overlay Online - Modern Material UI 3 (M3) Styles */

.dual-uploader-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}

.dual-drop-card {
  background: rgba(15, 23, 42, 0.65);
  border: 2px dashed rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  min-height: 180px;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.dual-drop-card:hover {
  border-color: #6366f1;
  background: rgba(99, 102, 241, 0.08);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.dual-drop-card.has-image {
  border-style: solid;
  border-color: #6366f1;
  background: rgba(99, 102, 241, 0.1);
  padding: 10px;
}

.dual-drop-card.waiting-image {
  border-color: #38bdf8;
  border-style: dashed;
  animation: pulse-border 2s infinite ease-in-out;
}

@keyframes pulse-border {
  0%, 100% { border-color: #38bdf8; box-shadow: 0 0 0 rgba(56, 189, 248, 0); }
  50% { border-color: #818cf8; box-shadow: 0 0 20px rgba(99, 102, 241, 0.4); }
}

.dual-preview-thumb {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.dual-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 4px 10px;
  border-radius: 9999px;
  font-size: 0.72rem;
  font-weight: 700;
  color: #818cf8;
  backdrop-filter: blur(6px);
  z-index: 2;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

/* Workspace Material Layers Card */
.workspace-layers-card {
  background: rgba(15, 23, 42, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  backdrop-filter: blur(14px);
  box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.3);
  margin-bottom: 16px;
}

.workspace-layers-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 10px;
}

.workspace-layer-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  background: rgba(30, 41, 59, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 10px 8px;
  text-align: center;
  transition: all 0.2s ease;
}

.workspace-layer-item:hover {
  border-color: rgba(99, 102, 241, 0.3);
}

.workspace-layer-thumb {
  width: 100%;
  height: 64px;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

.workspace-layer-title {
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 95px;
}

.workspace-layer-btn {
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #a5b4fc;
  padding: 4px 10px;
  border-radius: 9999px;
  font-size: 0.72rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.workspace-layer-btn:hover {
  background: #6366f1;
  color: #fff;
  border-color: #6366f1;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
}

.dual-replace-btn {
  position: absolute;
  bottom: 12px;
  background: rgba(15, 23, 42, 0.92);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 5px 12px;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  z-index: 2;
  transition: all 0.2s ease;
  backdrop-filter: blur(4px);
}

.dual-replace-btn:hover {
  background: #6366f1;
  border-color: #6366f1;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
}

/* Material 3 Layout Selector Segmented Tabs */
.layout-selector {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  background: rgba(15, 23, 42, 0.85);
  padding: 5px;
  border-radius: 9999px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(12px);
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.3);
  margin-bottom: 16px;
}

.layout-btn {
  padding: 8px 6px;
  background: transparent;
  border: none;
  border-radius: 9999px;
  color: var(--text-secondary);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  white-space: nowrap;
}

.layout-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.layout-btn.active {
  background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.45);
  font-weight: 700;
}

.btn-swap {
  background: rgba(30, 41, 59, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: var(--text-primary);
  padding: 6px 14px;
  border-radius: 9999px;
  font-size: 0.78rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-swap:hover {
  background: rgba(99, 102, 241, 0.2);
  border-color: #6366f1;
  color: #a5b4fc;
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.3);
}

.btn-swap svg {
  transition: transform 0.3s ease;
}

.btn-swap:hover svg {
  transform: rotate(180deg);
}

/* Canvas Viewport */
.canvas-container {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 480px;
  max-height: 680px;
  background-color: #0b0f19;
  background-image: linear-gradient(45deg, #141c2e 25%, transparent 25%),
                    linear-gradient(-45deg, #141c2e 25%, transparent 25%),
                    linear-gradient(45deg, transparent 75%, #141c2e 75%),
                    linear-gradient(-45deg, transparent 75%, #141c2e 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.5);
  user-select: none;
}

#composite-canvas {
  max-width: 100%;
  max-height: 100%;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
  transition: transform 0.05s ease-out;
  transform-origin: center center;
  border-radius: 4px;
}

/* Responsive */
.steps-grid,
.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

@media (max-width: 1024px) {
  .steps-grid,
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .steps-grid,
  .features-grid {
    grid-template-columns: 1fr;
  }
  .dual-uploader-grid {
    grid-template-columns: 1fr;
  }
  .layout-selector {
    grid-template-columns: repeat(2, 1fr);
    border-radius: 16px;
  }
}