/**
 * Canoe Timing Design System - DropZone Component
 *
 * Drag & drop komponenta:
 * - Dashed border, hover glow
 * - Drag-over animované pruhy
 * - has-file state pro vybraný soubor
 */

/* ==========================================================================
   DROPZONE BASE
   ========================================================================== */

.dropzone {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  min-height: 160px;
  padding: var(--space-6);
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-bg-surface);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.dropzone:hover {
  border-color: var(--color-accent);
  background-color: var(--color-bg-elevated);
}

.dropzone:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ==========================================================================
   DROPZONE CONTENT
   ========================================================================== */

.dropzone-icon {
  width: 48px;
  height: 48px;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.dropzone:hover .dropzone-icon {
  color: var(--color-accent);
}

.dropzone-text {
  text-align: center;
}

.dropzone-title {
  margin: 0;
  font-size: var(--text-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.dropzone-subtitle {
  margin: var(--space-1) 0 0;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.dropzone-hint {
  margin: var(--space-2) 0 0;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* Hidden file input */
.dropzone-input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

/* ==========================================================================
   DRAG-OVER STATE (animované pruhy)
   ========================================================================== */

.dropzone.drag-over {
  border-style: solid;
  border-color: var(--color-accent);
  background-color: var(--color-bg-elevated);
  box-shadow: var(--glow-accent);
}

/* Animovaný pruhovaný pattern jako "marching ants" */
.dropzone.drag-over::after {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: var(--radius-lg);
  pointer-events: none;
  background: repeating-linear-gradient(
    -45deg,
    transparent 0px,
    transparent 10px,
    rgba(0, 136, 255, 0.1) 10px,
    rgba(0, 136, 255, 0.1) 20px
  );
  background-size: 28px 28px;
  animation: dropzone-march 0.5s linear infinite;
}

@keyframes dropzone-march {
  from {
    background-position: 0 0;
  }
  to {
    background-position: 28px 0;
  }
}

.dropzone.drag-over .dropzone-icon {
  color: var(--color-accent);
  transform: scale(1.1);
}

/* ==========================================================================
   HAS-FILE STATE (soubor je vybraný)
   ========================================================================== */

.dropzone.has-file {
  border-color: var(--color-success);
  border-style: solid;
  background-color: var(--color-bg-elevated);
}

.dropzone.has-file .dropzone-icon {
  color: var(--color-success);
}

/* File info display */
.dropzone-file {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  width: 100%;
  max-width: 320px;
}

.dropzone-file-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  color: var(--color-accent);
}

.dropzone-file-info {
  flex: 1;
  min-width: 0;
}

.dropzone-file-name {
  margin: 0;
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.dropzone-file-size {
  margin: var(--space-1) 0 0;
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
}

.dropzone-file-remove {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  border: none;
  border-radius: var(--radius-full);
  background-color: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.dropzone-file-remove:hover {
  background-color: var(--color-error);
  color: white;
}

/* ==========================================================================
   ERROR STATE
   ========================================================================== */

.dropzone.has-error {
  border-color: var(--color-error);
}

.dropzone.has-error .dropzone-icon {
  color: var(--color-error);
}

.dropzone-error {
  margin: var(--space-2) 0 0;
  font-size: var(--text-sm);
  color: var(--color-error);
  text-align: center;
}

/* ==========================================================================
   DISABLED STATE
   ========================================================================== */

.dropzone.disabled,
.dropzone:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ==========================================================================
   SIZE VARIANTS
   ========================================================================== */

/* Compact */
.dropzone.dropzone-sm {
  min-height: 100px;
  padding: var(--space-4);
  gap: var(--space-2);
}

.dropzone.dropzone-sm .dropzone-icon {
  width: 32px;
  height: 32px;
}

.dropzone.dropzone-sm .dropzone-title {
  font-size: var(--text-sm);
}

/* Large */
.dropzone.dropzone-lg {
  min-height: 240px;
  padding: var(--space-8);
}

.dropzone.dropzone-lg .dropzone-icon {
  width: 64px;
  height: 64px;
}

.dropzone.dropzone-lg .dropzone-title {
  font-size: var(--text-lg);
}

/* ==========================================================================
   MULTIPLE FILES VARIANT
   ========================================================================== */

.dropzone-files {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  width: 100%;
  max-width: 100%;
}

.dropzone-files .dropzone-file {
  max-width: 280px;
}

/* ==========================================================================
   REDUCED MOTION
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  .dropzone.drag-over::after {
    animation: none;
  }

  .dropzone.drag-over .dropzone-icon {
    transform: none;
  }
}