:root {
  --mb-bg: #f4f5f7;
  --mb-dot: #d5d9e0;
  --mb-panel: #ffffff;
  --mb-ink: #111827;
  --mb-muted: #6b7280;
  --mb-line: #e5e7eb;
  --mb-accent: #e8590c;
  --mb-wire: #f08c00;
  --mb-shadow: 0 6px 20px rgba(17, 24, 39, .12);
}
.mb-page { display: block; width: 100%; padding: 0 0 48px; }
.mb-intro *, .mb-about * { text-align: left; }
.mb-intro, .mb-about { width: 100%; max-width: 1100px; margin: 0 auto; text-align: left; padding: 32px 20px 12px; box-sizing: border-box; color: var(--mb-ink); }
.mb-intro { padding-top: 40px; background: rgba(255, 255, 255, .94); border-radius: 12px 12px 0 0; margin-top: 32px; }
.mb-intro h1 { margin: 8px 0 6px; font: 750 clamp(28px, 4vw, 40px)/1.1 Inter, system-ui, sans-serif; letter-spacing: -1px; color: #101828; }
.mb-intro p { margin: 0; color: #475467; font: 400 16px/1.55 Inter, system-ui, sans-serif; max-width: 760px; }
.mb-intro .demo-crumbs { font: 500 14px/1.5 Inter, system-ui, sans-serif; }
.mb-about { background: rgba(255, 255, 255, .94); border-radius: 0 0 12px 12px; padding-bottom: 28px; color: #344054; }
.mb-about h2 { font: 700 24px/1.2 Inter, system-ui, sans-serif; color: #101828; margin: 8px 0 12px; }
.mb-about li, .mb-about p { font: 400 16px/1.65 Inter, system-ui, sans-serif; }
.mb-about ol { display: block; padding-left: 22px; }
.mb-about li { display: list-item; margin: 6px 0; }

.mb-app {
  position: relative; display: grid; grid-template-columns: 280px 1fr; width: 100%; max-width: 1100px; box-sizing: border-box; text-align: left; margin: 0 auto;
  height: clamp(520px, calc(100vh - 190px), 820px); background: var(--mb-bg); color: var(--mb-ink);
  font: 400 14px/1.4 Inter, system-ui, -apple-system, sans-serif; overflow: hidden; border-top: 1px solid var(--mb-line); border-bottom: 1px solid var(--mb-line);
  user-select: none; -webkit-user-select: none;
}
.mb-app.mb-side-hidden { grid-template-columns: 0 1fr; }
.mb-app.mb-side-hidden .mb-side { visibility: hidden; }
.mb-side { background: var(--mb-panel); border-right: 1px solid var(--mb-line); display: flex; flex-direction: column; min-width: 0; overflow: hidden; z-index: 3; }
.mb-tabs { display: flex; border-bottom: 1px solid var(--mb-line); }
.mb-tab { flex: 1; padding: 12px 6px; border: 0; background: none; color: var(--mb-muted); font: 600 13px Inter, system-ui, sans-serif; cursor: pointer; border-bottom: 2px solid transparent; }
.mb-tab.active { color: var(--mb-ink); border-bottom-color: var(--mb-accent); }
.mb-pane { display: none; padding: 12px; overflow-y: auto; flex: 1; }
.mb-pane.active { display: block; }
.mb-search, .mb-url { display: flex; gap: 6px; margin-bottom: 8px; }
.mb-search input, .mb-url input { flex: 1; min-width: 0; padding: 8px 10px; border: 1px solid var(--mb-line); border-radius: 8px; background: var(--mb-bg); color: var(--mb-ink); font: inherit; user-select: text; }
.mb-btn { padding: 8px 12px; border: 1px solid var(--mb-line); border-radius: 8px; background: var(--mb-panel); color: var(--mb-ink); font: 600 13px Inter, system-ui, sans-serif; cursor: pointer; }
.mb-btn:hover { border-color: var(--mb-accent); }
.mb-btn:disabled { opacity: .55; cursor: wait; }
.mb-wide { display: block; width: 100%; margin: 8px 0; text-align: center; box-sizing: border-box; }
.mb-danger { color: #c92a2a; }
.mb-hint { color: var(--mb-muted); font-size: 12px; margin: 4px 0 8px; }
.mb-hint.err { color: #c92a2a; }
.mb-results { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px; }
.mb-result { padding: 0; border: 0; border-radius: 8px; overflow: hidden; aspect-ratio: 1; background: var(--mb-line); cursor: grab; }
.mb-result img { width: 100%; height: 100%; object-fit: cover; display: block; pointer-events: none; }
.mb-drop { display: flex; align-items: center; justify-content: center; min-height: 110px; border: 2px dashed var(--mb-line); border-radius: 10px; color: var(--mb-muted); text-align: center; padding: 12px; margin-bottom: 10px; cursor: pointer; }
.mb-drop:hover { border-color: var(--mb-accent); color: var(--mb-ink); }
.mb-help p { color: var(--mb-muted); font-size: 12px; margin: 8px 0; }
.mb-help b { color: var(--mb-ink); }

.mb-stage {
  position: relative; overflow: hidden; touch-action: none; cursor: grab; outline: none;
  background-color: var(--mb-bg); background-image: radial-gradient(var(--mb-dot) 1px, transparent 1px); background-size: 22px 22px;
}
.mb-stage.panning { cursor: grabbing; }
.mb-world { position: absolute; left: 0; top: 0; transform-origin: 0 0; will-change: transform; }
.mb-wires { position: absolute; left: -100000px; top: -100000px; pointer-events: none; }
.mb-wire { fill: none; stroke: var(--mb-wire); stroke-width: 2.5; stroke-linecap: round; }
.mb-temp { stroke-dasharray: 6 6; }
.mb-toolbar { position: absolute; top: 10px; right: 10px; z-index: 4; display: flex; align-items: center; gap: 4px; padding: 4px; background: var(--mb-panel); border: 1px solid var(--mb-line); border-radius: 10px; box-shadow: var(--mb-shadow); }
.mb-icon { width: 32px; height: 32px; border: 0; border-radius: 8px; background: none; color: var(--mb-ink); font-size: 18px; cursor: pointer; }
.mb-icon:hover { background: var(--mb-bg); }
.mb-zoom { min-width: 44px; text-align: center; font-size: 12px; color: var(--mb-muted); }
.mb-empty { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; color: var(--mb-muted); pointer-events: none; font-size: 15px; }

.mb-node { position: absolute; box-sizing: border-box; background: var(--mb-panel); border: 1px solid var(--mb-line); border-radius: 12px; box-shadow: var(--mb-shadow); cursor: grab; }
.mb-node.selected { border-color: var(--mb-accent); box-shadow: 0 0 0 2px var(--mb-accent), var(--mb-shadow); }
.mb-node.mb-target { box-shadow: 0 0 0 3px var(--mb-wire), var(--mb-shadow); }
.mb-image img { display: block; width: 100%; min-height: 120px; max-height: 320px; object-fit: cover; border-radius: 11px 11px 0 0; background: repeating-conic-gradient(var(--mb-line) 0 25%, transparent 0 50%) 0 0 / 16px 16px; pointer-events: none; }
.mb-image img:not([src]), .mb-image img[src=""] { visibility: hidden; height: 200px; }
.mb-caption { padding: 7px 10px 9px; font-size: 12px; color: var(--mb-muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.mb-tag { display: inline-block; margin-right: 6px; padding: 1px 6px; border-radius: 999px; background: var(--mb-bg); color: var(--mb-ink); font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; }
.mb-port { position: absolute; top: 50%; width: 18px; height: 18px; margin-top: -9px; border-radius: 50%; background: var(--mb-panel); border: 3px solid var(--mb-wire); box-sizing: border-box; padding: 0; z-index: 2; }
.mb-out { right: -10px; cursor: crosshair; }
.mb-out:hover, .mb-wiring .mb-out { transform: scale(1.25); }
.mb-in { left: -10px; border-color: var(--mb-dot); pointer-events: none; }
.mb-out::after { content: ''; position: absolute; inset: -12px; }
.mb-prompt { padding: 0 0 10px; }
.mb-head { display: flex; align-items: center; gap: 8px; padding: 9px 10px; border-bottom: 1px solid var(--mb-line); font-weight: 700; }
.mb-refs { margin-left: auto; color: var(--mb-muted); font-weight: 500; font-size: 12px; }
.mb-x { border: 0; background: none; color: var(--mb-muted); font-size: 18px; line-height: 1; cursor: pointer; padding: 0 2px; }
.mb-prompt textarea { display: block; width: calc(100% - 20px); margin: 10px 10px 8px; box-sizing: border-box; resize: vertical; min-height: 96px; padding: 8px; border: 1px solid var(--mb-line); border-radius: 8px; background: var(--mb-bg); color: var(--mb-ink); font: 13px/1.45 Inter, system-ui, sans-serif; user-select: text; }
.mb-row { display: flex; gap: 6px; padding: 0 10px; }
.mb-row select { flex: 1; min-width: 0; padding: 7px; border: 1px solid var(--mb-line); border-radius: 8px; background: var(--mb-panel); color: var(--mb-ink); font: inherit; }
.mb-go { background: var(--mb-accent); border-color: var(--mb-accent); color: #fff; }
.mb-status { min-height: 16px; padding: 6px 10px 0; font-size: 12px; color: var(--mb-muted); }
.mb-status.err { color: #c92a2a; }
.mb-node.working { border-color: var(--mb-wire); }
.mb-spin { position: absolute; left: 50%; top: 45%; width: 34px; height: 34px; margin: -17px; border: 3px solid var(--mb-line); border-top-color: var(--mb-accent); border-radius: 50%; animation: mb-spin .8s linear infinite; }
@keyframes mb-spin { to { transform: rotate(360deg); } }

.mb-menu { position: fixed; z-index: 1000; min-width: 190px; padding: 5px; background: var(--mb-panel); border: 1px solid var(--mb-line); border-radius: 10px; box-shadow: var(--mb-shadow); font: 13px Inter, system-ui, sans-serif; }
.mb-menu button { display: block; width: 100%; padding: 8px 10px; border: 0; border-radius: 6px; background: none; color: var(--mb-ink); text-align: left; cursor: pointer; font: inherit; }
.mb-menu button:hover, .mb-menu button:focus { background: var(--mb-bg); outline: none; }
.mb-toast { position: absolute; left: 50%; bottom: 16px; transform: translate(-50%, 20px); padding: 8px 14px; border-radius: 8px; background: #111827; color: #fff; font-size: 13px; opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; z-index: 5; }
.mb-toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 760px) {
  .mb-intro { margin-top: 24px; padding: 28px 16px 12px; border-radius: 0; }
  .mb-about { padding: 20px 16px; border-radius: 0; }
  .mb-app { grid-template-columns: 1fr; grid-template-rows: auto 1fr; height: calc(100vh - 90px); min-height: 520px; }
  .mb-app.mb-side-hidden { grid-template-columns: 1fr; grid-template-rows: 1fr; }
  .mb-app.mb-side-hidden .mb-side { display: none; }
  .mb-side { max-height: 40vh; border-right: 0; border-bottom: 1px solid var(--mb-line); }
  .mb-results { grid-template-columns: repeat(4, 1fr); }
}
@media (prefers-reduced-motion: reduce) { .mb-spin { animation-duration: 2s; } .mb-toast { transition: none; } }