/* Responsive styles */
/* ====================================
 * 7. ANIMATIONS & KEYFRAMES
 * Motion and visual feedback
 * ==================================== */

@keyframes spin {
  0% {
    transform: translate(-50%, -50%) rotate(0deg);
  }
  100% {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-10px);
  }
}


@keyframes flash-success {
  0%, 100% {
    background: none;
  }
  50% {
    background-color: var(--color-green-1);
    color: var(--color-white);
  }
}

/* ====================================
 * 8. RESPONSIVE DESIGN
 * Adaptive layouts for different screen sizes
 * ==================================== */

/* Mobile: Stack cards vertically, smaller size */
@media (max-width: 640px) {
  #selected-files-list {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  
  #selected-files-list li {
    width: 100%;
    max-width: 400px;
    min-height: 220px;
    padding: 1rem;
    margin-bottom: 20px;
  }

  .card-thumbnail-wrapper {
    height: 180px;
    padding: 12px;
  }

  .card-thumbnail-frame {
    max-width: 220px;
  }

  .card-thumbnail-page {
    width: 78%;
    height: 78%;
  }

  .card-thumbnail-surface {
    padding: 0;
  }

  .card-meta {
    gap: 6px;
  }

  .orientation-badge,
  .file-type-badge {
    font-size: 0.72rem;
  }

  .card-body {
    gap: 6px;
  }

  .file-name {
    font-size: 0.85rem;
    max-height: 2.4rem;
  }

  .file-size,
  .file-pages {
    font-size: 0.7rem;
  }

  .pdf-page-range-input {
    font-size: 1rem;
  }

  .delete-file-button {
    width: 44px;
    min-width: 44px;
    height: 44px;
  }

  .delete-file-button .icon {
    font-size: 20px;
  }

  .rotation-controls {
    gap: 6px;
  }

  
  .paper-size-group {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  
  .paper-size-item {
    margin: 0;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  
  .paper-size-item label {
    margin-bottom: 4px;
    margin-right: 0;
  }
  
  .paper-size-item select {
    width: 100%;
  }
  
}



/* Tablet: 2-column grid layout */
@media (min-width: 641px) and (max-width: 1024px) {
  #selected-files-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
    max-width: 720px;
    margin: 0 auto;
  }
  
  #selected-files-list li {
    width: 100%;
    max-width: 350px;
    min-width: 0;
    min-height: 220px;
  }
  
  
  .file-size,
  .file-pages {
    font-size: 0.8rem;
    max-width: 100px;
  }
  
  .pdf-page-range-input {
    font-size: 1rem;
  }
  
  .delete-file-button {
    min-width: 44px;
    width: 44px;
    height: 44px;
    padding: 6px;
  }
  
  .delete-file-button .icon {
    font-size: 22px;
  }
}

/* Desktop: 3-column grid layout */
@media (min-width: 1025px) {
  #selected-files-list {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin: 0 auto;
  }

  #selected-files-list li {
    width: 100%;
    max-width: 100%;
    min-height: 220px;
  }

  .delete-file-button {
    width: 44px;
    min-width: 44px;
    height: 44px;
  }
}

/* Extra Large Desktop: keep 3-column layout */
@media (min-width: 1400px) {
  #selected-files-list {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  #selected-files-list li {
    width: 100%;
    max-width: 100%;
    min-height: 220px;
  }
}

::selection {
  background: var(--accent-dim);
  color: var(--font-color);
}

.tool-surface:has(#drop-area:not(.has-files)) {
  max-width: 720px;
  margin: 0 auto;
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
}

/* The native label covers only the empty zone, leaving file-card controls operable. */
#drop-area:not(.has-files) #file-upload-label::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius-panel);
}

#drop-area:has(#file-input:focus-visible) {
  outline: 2px solid var(--focus-color);
  outline-offset: 4px;
}

#drop-area.has-files {
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
  transform: none;
}

#drop-area.has-files .drop-sub {
  display: none;
}

#drop-area.has-files #file-upload-label {
  margin-bottom: 1.25rem;
}

#drop-area.has-files #file-list {
  margin-bottom: 1.25rem;
}

#drop-area.has-files.drag {
  outline: 2px dashed var(--focus-color);
  outline-offset: 4px;
}

#output-filename {
  min-width: 0;
}

@media (max-width: 640px) {
  .tool-surface {
    padding: 1rem;
  }

  #selected-files-list li {
    margin-bottom: 0;
    min-width: 0;
  }

  .tool-actions .button {
    flex-basis: 100%;
    width: 100%;
  }

  .settings-content {
    padding: 0.875rem;
  }

  .text-content-row,
  .text-content-row--line,
  .text-appearance-row {
    grid-template-columns: 1fr;
  }
}

/* Shared responsive shell: keep identical in both apps. */
#browse-btn,
#file-upload-label {
  min-height: 48px;
  padding: 0.875rem 1.25rem;
  font-size: 1rem;
  line-height: 1.25;
}

#browse-btn .icon,
#file-upload-label .icon {
  font-size: 1.125rem;
}

.header-top > button {
  flex: 0 0 44px;
  width: 44px;
  height: 44px;
  margin: 0 0 0 auto;
  padding: 0.5rem;
}

a.branding,
a.branding:visited,
a.branding:hover {
  color: var(--branding-font-color);
}

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

.footer-secondary a {
  color: var(--color-blue-text);
  text-decoration: underline;
  text-underline-offset: 0.18rem;
  white-space: nowrap;
}

.footer-secondary .footer-try {
  white-space: nowrap;
}

.drop-title {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--font-color);
}

.drop-sub {
  margin: 0.5rem 0 1.25rem;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--font-color-2);
  text-wrap: balance;
}

.drop-touch-hint {
  display: none;
}

@media (pointer: coarse) {
  .drop-touch-hint { display: inline; }
  .drop-drag-hint { display: none; }
}

@media (max-width: 640px) {
  body {
    padding: 0.5rem max(1rem, env(safe-area-inset-right)) 0 max(1rem, env(safe-area-inset-left));
  }

  .hero {
    margin: 1.25rem auto 1rem;
  }

  .hero h1 {
    max-width: 19ch;
    font-size: 2rem;
  }

  .hero p {
    margin-top: 0.75rem;
    font-size: 0.9375rem;
  }

  .hero-points {
    gap: 0.375rem;
    margin-bottom: 1.5rem;
  }

  .hero-point {
    font-size: 0.75rem;
    padding: 0.35rem 0.55rem;
  }

  footer {
    margin-top: 1.5rem;
  }
}