.tool-header {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 24px;
  margin-bottom: 28px;
}

.tool-header > div {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tool-header .lead {
  max-width: 60ch;
}

.tool-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 32px;
  margin-top: 1.25rem;
  align-items: stretch;
}

.upload-card {
  display: flex;
  flex-direction: column;
  min-height: 260px;
}

.upload-area {
  position: relative;
  flex: 1;
  border: 2px dashed var(--border);
  border-radius: 18px;
  padding: 2rem;
  background: var(--surface-muted);
  text-align: center;
  transition: border-color 0.2s ease, background 0.2s ease;
  cursor: pointer;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1rem;
}

.upload-area.is-dragover {
  border-color: var(--primary);
  background: color-mix(in srgb, var(--accent-soft) 55%, var(--surface));
}

.upload-area input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.upload-placeholder {
  display: grid;
  gap: 0.4rem;
}

.upload-placeholder[hidden] {
  display: none;
}

.upload-icon {
  width: 42px;
  height: 42px;
  margin: 0 auto;
  border-radius: 12px;
  background: var(--accent-soft);
  display: grid;
  place-items: center;
}

.upload-icon svg {
  width: 24px;
  height: 24px;
  fill: var(--primary);
}

.upload-title {
  margin: 0.6rem 0 0.3rem;
  font-weight: 700;
}

.upload-preview {
  display: grid;
  gap: 0.8rem;
  align-items: center;
}

.upload-preview[hidden] {
  display: none;
}

.upload-preview img {
  width: 100%;
  max-height: 260px;
  object-fit: contain;
  border-radius: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
}

.upload-list {
  display: grid;
  gap: 0.6rem;
  width: 100%;
}

.upload-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.55rem 0.75rem;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--muted);
}

.upload-item strong {
  color: var(--text);
}

.upload-item span {
  white-space: nowrap;
}

.preview-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1rem;
  justify-content: center;
  font-size: 0.9rem;
  color: var(--muted);
}

.preview-meta strong {
  color: var(--text);
}

.upload-meta {
  margin-top: 0.75rem;
}

.controls-card h2 {
  margin-bottom: 1rem;
}

.control-group {
  margin-bottom: 1rem;
}

.control-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.small {
  font-size: 0.85rem;
  margin-top: 0.35rem;
}

#upscaleBtn {
  width: 100%;
  margin-top: 0.4rem;
}

.action-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.7rem;
  margin-top: 0.4rem;
}

.status {
  margin-top: 0.6rem;
  font-size: 0.9rem;
  color: var(--text);
}

.status.muted {
  color: var(--muted);
}

.status.is-error {
  color: var(--danger, #e25555);
}

.inline-loader {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: 0.6rem;
  font-weight: 600;
  color: var(--muted);
}

.inline-loader[hidden] {
  display: none;
}

.inline-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}

.preview-card {
  margin-top: 2rem;
}

.preview-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.preview-empty {
  display: grid;
  gap: 0.35rem;
  place-items: center;
  text-align: center;
  padding: 1.25rem;
  color: var(--muted);
}

.preview-empty strong {
  color: var(--text);
}

.preview-empty-icon {
  width: 36px;
  height: 36px;
  border-radius: 12px;
  background: var(--accent-soft);
  display: grid;
  place-items: center;
  color: var(--primary);
}

.preview-empty-icon svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.preview-dim {
  font-size: 0.9rem;
  color: var(--muted);
}

.preview-grid {
  display: grid;
  gap: 1.5rem;
}

.preview-item {
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1rem;
  background: var(--surface);
  box-shadow: var(--shadow);
  display: grid;
  gap: 0.9rem;
}

.preview-item-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1rem;
  font-size: 0.95rem;
}

.preview-item-name {
  font-weight: 700;
}

.preview-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.preview-pane {
  display: grid;
  gap: 0.5rem;
}

.preview-label {
  font-weight: 600;
}

.preview-frame {
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--surface-muted);
  min-height: 220px;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.preview-frame img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.loading-overlay {
  position: fixed;
  inset: 0;
  background: color-mix(in srgb, var(--surface) 65%, transparent);
  display: grid;
  place-items: center;
  z-index: 40;
  backdrop-filter: blur(3px);
}

.loading-overlay[hidden] {
  display: none;
}

.loading-card {
  display: grid;
  gap: 0.6rem;
  padding: 1.5rem 2rem;
  border-radius: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  text-align: center;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.18);
}

.spinner {
  width: 22px;
  height: 22px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
  margin: 0 auto;
}

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

.how-it-works {
  margin-top: 2rem;
  background: var(--surface-muted);
  border-radius: 14px;
  padding: 0.8rem 1rem;
  border: 1px solid var(--border);
}

.how-it-works summary {
  cursor: pointer;
  font-weight: 600;
}

.how-it-works ul {
  margin: 0.8rem 0 0 1.2rem;
  color: var(--muted);
}

.btn {
  min-height: 44px;
  padding: 12px 16px;
}

@media (max-width: 1024px) {
  .tool-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .tool-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .preview-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .preview-pair {
    grid-template-columns: 1fr;
  }

  .btn {
    width: 100%;
  }
}

@media (min-width: 768px) {
  .action-row {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .upload-area {
    padding: 1.5rem;
  }

  .upload-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .upload-item span {
    white-space: normal;
  }
}

h1, h2 {
  word-break: break-word;
}