:root {
  --bg: #f6f7f9;
  --fg: #1f2328;
  --muted: #57606a;
  --border: #d0d7de;
  --accent: #0969da;
  --accent-fg: #fff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC",
    "Microsoft JhengHei", Roboto, Helvetica, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.6;
}

.app-header {
  max-width: 980px;
  margin: 0 auto;
  padding: 24px 16px 8px;
}
.app-header h1 { margin: 0 0 4px; font-size: 1.5rem; }
.subtitle { margin: 0; color: var(--muted); font-size: 0.95rem; }

kbd {
  background: #fff;
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0 5px;
  font-size: 0.85em;
}

.toolbar {
  max-width: 980px;
  margin: 12px auto 0;
  padding: 0 16px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.toolbar button {
  font: inherit;
  font-size: 0.9rem;
  padding: 7px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--accent);
  color: var(--accent-fg);
  cursor: pointer;
}
.toolbar button:hover { filter: brightness(1.06); }
.toolbar button.ghost {
  background: #fff;
  color: var(--fg);
}
.status {
  margin-left: auto;
  font-size: 0.88rem;
  color: var(--accent);
}
.status.error { color: #cf222e; }

main {
  max-width: 980px;
  margin: 12px auto 0;
  padding: 0 16px;
}

.app-footer {
  max-width: 980px;
  margin: 16px auto 32px;
  padding: 0 16px;
  color: var(--muted);
  font-size: 0.85rem;
}

/* EasyMDE 高度微調 */
.EasyMDEContainer .CodeMirror { min-height: 420px; }
.editor-preview, .editor-preview-side { font-size: 0.95rem; }
.editor-preview table, .editor-preview-side table { border-collapse: collapse; }
.editor-preview th, .editor-preview td,
.editor-preview-side th, .editor-preview-side td {
  border: 1px solid var(--border);
  padding: 4px 8px;
}