.tool-ui {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 2.5rem;
  text-align: center;
  cursor: pointer;
  background: var(--surface);
  transition: border-color 0.2s, background-color 0.2s;
}

.drop-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.file-label {
  color: var(--accent);
  cursor: pointer;
  text-decoration: underline;
  font-weight: 500;
}

.doc-info-card {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.doc-meta {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.doc-name {
  font-weight: 600;
  color: var(--text);
  word-break: break-all;
}

.doc-details {
  font-size: 0.825rem;
  color: var(--text-3);
}

.mode-selector {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.75rem;
}

@media (max-width: 640px) {
  .mode-selector {
    grid-template-columns: 1fr;
  }
}

.mode-btn {
  padding: 0.75rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-2);
  font-weight: 500;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}

.mode-btn:hover:not(.active) {
  border-color: var(--accent);
  color: var(--text);
  background: var(--hover);
}

.mode-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.mode-panel {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.25rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
}

/* Ensure hidden mode panels are strictly hidden regardless of cascade order */
.mode-panel.hidden,
.tool-ui .hidden,
.hidden {
  display: none !important;
}

.preset-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.chip-btn {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-2);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.chip-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

.split-preview {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-size: 0.8rem;
  color: var(--text-2);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  max-height: 160px;
  overflow-y: auto;
}

.range-input {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.625rem 0.875rem;
  color: var(--text);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.2s;
}

.range-input:focus {
  border-color: var(--accent);
}

.helper-text {
  font-size: 0.75rem;
  color: var(--text-3);
  line-height: 1.4;
}

.btn-primary {
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  cursor: pointer;
  font-family: 'DM Sans', sans-serif;
  font-weight: 600;
  transition: opacity 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-primary:hover:not(:disabled) {
  opacity: 0.85;
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.4rem 0.8rem;
  font-size: 0.825rem;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.results-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-height: 320px;
  overflow-y: auto;
  padding-right: 0.25rem;
}

.result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.875rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.875rem;
  color: var(--text);
}

.result-item span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ad-post-op {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  font-size: 0.75rem;
  color: var(--text-3);
  text-align: center;
}