:root {
  --bg: #0f1419;
  --panel: #1a2332;
  --border: #2d3a4f;
  --text: #e7ecf3;
  --muted: #8b9cb3;
  --accent: #3d8bfd;
  --accent-hover: #5ca0ff;
}

* {
  box-sizing: border-box;
}

body.app {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.layout {
  display: grid;
  grid-template-columns: minmax(280px, 360px) 1fr;
  min-height: 100vh;
}

.sidebar {
  border-right: 1px solid var(--border);
  padding: 1.25rem;
  background: var(--panel);
}

.sidebar h1 {
  margin: 0 0 0.25rem;
  font-size: 1.15rem;
  font-weight: 600;
}

.sidebar .tagline {
  margin: 0 0 1.25rem;
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.4;
}

.panel-block {
  margin-bottom: 1.25rem;
}

.panel-block label {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.35rem;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.35rem;
  font-size: 0.9rem;
  color: var(--text);
  cursor: pointer;
  user-select: none;
}

.checkbox-row input {
  width: 1rem;
  height: 1rem;
  accent-color: var(--accent);
  cursor: pointer;
}

.binding-hint {
  margin: 0 0 1rem;
  font-size: 0.75rem;
  color: var(--muted);
  line-height: 1.35;
}

.file-drop {
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.file-drop:hover,
.file-drop.dragover {
  border-color: var(--accent);
  background: rgba(61, 139, 253, 0.08);
}

.file-drop input {
  display: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  width: 100%;
  padding: 0.55rem 0.75rem;
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  cursor: pointer;
  margin-top: 0.5rem;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover:not(:disabled) {
  border-color: var(--muted);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.status {
  font-size: 0.85rem;
  margin-top: 0.75rem;
  min-height: 1.2em;
}

.status.error {
  color: #ff8a8a;
}

.status.ok {
  color: #7ddea8;
}

.hint {
  font-size: 0.75rem;
  color: var(--muted);
  line-height: 1.45;
  margin-top: 0.75rem;
}

.preview-wrap {
  overflow: auto;
  padding: 1rem;
  background: #2a2a2a;
}

.preview-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.5rem 1rem;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}

.preview-frame {
  transform-origin: top center;
  margin: 0 auto;
}

.preview-empty {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--muted);
}

/* Form preview must not inherit the dark UI text color */
body.app .document.preview-root {
  color: #000;
  font-family: 'Times New Roman', Times, serif;
}

body.app .document.preview-root .form-page,
body.app .document.preview-root .form-page th,
body.app .document.preview-root .form-page td,
body.app .document.preview-root .form-page p,
body.app .document.preview-root .form-page h1 {
  color: #000;
}

body.app .document.preview-root .grid-table {
  border: 1px solid #000;
}

body.app .document.preview-root .grid-table th,
body.app .document.preview-root .grid-table td {
  border: 1px solid #000;
  background: #fff;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }
}