/* MetricLab Upload / Dropzone System: upload interaction and file lifecycle. */
:root {
  --upload-padding: clamp(var(--space-lg), 4vw, var(--space-xl));
  --upload-radius: var(--surface-card-radius, var(--radius-card));
  --upload-border: var(--surface-card-border, 1px solid var(--border));
  --upload-gap: var(--space-md);
  --upload-preview-gap: var(--space-md);
  --upload-drop-border: color-mix(in srgb, var(--primary) 34%, var(--border));
  --upload-hover-border: var(--primary);
  --upload-min-height: 13rem;
}

.ml-upload {
  display: grid;
  gap: var(--upload-gap);
  min-width: 0;
}

.ml-upload__surface {
  box-sizing: border-box;
  display: grid;
  gap: var(--space-xs);
  place-items: center;
  width: 100%;
  min-width: 0;
  min-height: var(--upload-min-height);
  padding: var(--upload-padding);
  color: var(--muted);
  font: inherit;
  text-align: center;
  border: 2px dashed var(--upload-drop-border);
  border-radius: var(--upload-radius);
  background: var(--surface-card-bg, var(--card));
  cursor: pointer;
  transition:
    border-color var(--transition-fast),
    background-color var(--transition-fast),
    transform var(--transition-fast);
}

.ml-upload__surface:hover,
.ml-upload__surface:focus-visible,
.ml-upload__surface.is-dragging,
.ml-upload__surface[data-upload-state="drag-active"] {
  border-color: var(--upload-hover-border);
  background: color-mix(in srgb, var(--primary) 7%, var(--card));
}

.ml-upload__surface:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  box-shadow: var(--shadow-focus);
}

.ml-upload__surface.is-dragging,
.ml-upload__surface[data-upload-state="drag-active"] {
  transform: translateY(-1px);
}

.ml-upload__surface.has-image,
.ml-upload__surface[data-upload-state="file-selected"],
.ml-upload__surface[data-upload-state="preview-available"],
.ml-upload__surface[data-upload-state="processed"] {
  border-style: solid;
}

.ml-upload__surface[aria-disabled="true"],
.ml-upload__surface[data-upload-state="processing"] {
  cursor: progress;
  opacity: 0.72;
}

.ml-upload__input {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.ml-upload__preview-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--upload-preview-gap);
  min-width: 0;
}

.ml-upload__preview-group {
  display: grid;
  gap: var(--space-sm);
  min-width: 0;
}

.ml-upload__preview {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
  min-width: 0;
  overflow: hidden;
}

.ml-upload__preview img,
.ml-upload__preview canvas,
.ml-upload__preview video {
  display: block;
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

.ml-upload__metadata {
  min-width: 0;
  overflow-wrap: anywhere;
}

.ml-upload__status {
  min-width: 0;
}

.ml-upload__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  align-items: center;
}

.ml-upload__spinner {
  inline-size: 1.25rem;
  block-size: 1.25rem;
  border: 2px solid color-mix(in srgb, var(--primary) 24%, transparent);
  border-top-color: var(--primary);
  border-radius: var(--radius-pill);
  animation: ml-upload-spin 0.8s linear infinite;
}

@keyframes ml-upload-spin {
  to {
    transform: rotate(1turn);
  }
}

@media (width <= 760px) {
  :root {
    --upload-min-height: 10rem;
    --upload-padding: var(--mobile-card-padding, var(--space-lg));
  }

  .ml-upload__preview-grid {
    grid-template-columns: 1fr;
  }
}

@media (width <= 520px) {
  .ml-upload__actions {
    align-items: stretch;
    flex-direction: column;
  }

  .ml-upload__actions > * {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ml-upload__surface {
    transition: none;
  }

  .ml-upload__surface.is-dragging,
  .ml-upload__surface[data-upload-state="drag-active"] {
    transform: none;
  }

  .ml-upload__spinner {
    animation-duration: 1.6s;
  }
}

@media (forced-colors: active) {
  .ml-upload__surface {
    border-color: ButtonText;
  }
}