:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --line: #e2e5ea;
  --text: #1f2430;
  --muted: #6b7280;
  --accent: #7c3aed;
  --accent-soft: #f1ebfe;
  --danger: #dc2626;
  --warn: #b45309;
  --ok: #15803d;
  --t-list: #2563eb;
  --t-buttons: #7c3aed;
  --t-message: #0f766e;
  --t-input: #c2410c;
  --t-action: #4b5563;
  --t-template: #be185d;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  display: flex;
  flex-direction: column;
}
button, input, select, textarea { font: inherit; color: inherit; }
button {
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  border-radius: 6px;
  padding: 6px 12px;
  cursor: pointer;
}
button:disabled { opacity: .45; cursor: default; }
button.secondary { background: #fff; color: var(--text); border-color: var(--line); }
button.secondary:hover:not(:disabled) { border-color: #c5cad3; }
button.danger { background: #fff; color: var(--danger); border-color: #f3c4c4; }
button.link { background: none; border: none; color: var(--muted); padding: 2px 4px; }
button.icon { background: #fff; color: var(--text); border-color: var(--line); padding: 2px 8px; }
button.small { padding: 3px 8px; font-size: 12px; }
input[type=text], input[type=number], select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 6px 8px;
  background: #fff;
}
textarea { resize: vertical; min-height: 64px; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }

/* Header */
header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}
header .brand { font-weight: 700; margin-right: 8px; }
header select { width: auto; min-width: 140px; }
header .sep { width: 1px; height: 24px; background: var(--line); margin: 0 4px; }
header .grow { flex: 1; }
.pill { background: #fff; border-color: var(--line); color: var(--muted); border-radius: 999px; }
.pill.ok { color: var(--ok); border-color: #bbe5c8; background: #f0fbf3; }
.pill.bad { color: var(--danger); border-color: #f3c4c4; background: #fef2f2; }

main { flex: 1; display: flex; min-height: 0; }

/* Canvas */
#canvas {
  flex: 1;
  overflow: auto;
  background-color: var(--bg);
  background-image: radial-gradient(#d5d9e0 1px, transparent 1px);
  background-size: 20px 20px;
}
#world { position: relative; min-width: 100%; min-height: 100%; }
#edges { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; z-index: 0; overflow: visible; }
.edge { fill: none; stroke: #94a3b8; stroke-width: 1.6; }
.edge.k-err { stroke: #f87171; stroke-dasharray: 5 4; }
.edge.back { opacity: .35; }
header .toggle { display: flex; align-items: center; gap: 5px; color: var(--muted); font-size: 13px; cursor: pointer; }
.edge.hl { stroke: var(--accent); stroke-width: 2.2; }
.edge.temp { stroke: var(--accent); stroke-dasharray: 4 4; }

.card {
  position: absolute;
  z-index: 1;
  width: 230px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: 0 1px 2px rgba(0,0,0,.05);
  cursor: grab;
  user-select: none;
}
.card:hover { border-color: #c5cad3; }
.card.selected { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.card.has-error { border-color: var(--danger); }
.card.unreachable { opacity: .65; }
.card.drop { box-shadow: 0 0 0 3px #c4b5fd; }
.card.live .card-head::after { content: "● preview here"; margin-left: auto; color: var(--ok); font-size: 11px; }
.card-head { display: flex; align-items: center; gap: 6px; padding: 8px 10px 4px; }
.card-head .cid { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.badge { font-size: 10px; font-weight: 700; letter-spacing: .04em; padding: 1px 6px; border-radius: 4px; color: #fff; }
.start { font-size: 10px; font-weight: 700; color: var(--accent); border: 1px solid var(--accent); border-radius: 4px; padding: 0 4px; }
.t-list .badge { background: var(--t-list); }
.t-buttons .badge { background: var(--t-buttons); }
.t-message .badge { background: var(--t-message); }
.t-input .badge { background: var(--t-input); }
.t-action .badge { background: var(--t-action); }
.t-template .badge { background: var(--t-template); }
.t-media .badge { background: #0369a1; }
.bubble .media { display: block; max-width: 100%; border-radius: 6px; margin-bottom: 4px; }
.card-text { padding: 0 10px 8px; color: var(--muted); font-size: 12.5px; white-space: pre-line; max-height: 56px; overflow: hidden; }
.ports { border-top: 1px solid var(--line); }
.port { position: relative; display: flex; gap: 6px; align-items: center; padding: 5px 22px 5px 10px; font-size: 12.5px; border-bottom: 1px solid #f0f1f4; }
.port:last-child { border-bottom: none; }
.port .plabel { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.port .ptarget { color: var(--muted); font-size: 11.5px; max-width: 90px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.port.broken .ptarget { color: var(--danger); }
.port.k-add .plabel { color: var(--muted); font-style: italic; }
.port.k-err .plabel { color: var(--danger); }
.dot {
  position: absolute;
  right: -7px;
  top: 50%;
  width: 13px;
  height: 13px;
  margin-top: -6.5px;
  border-radius: 50%;
  background: #fff;
  border: 2px solid #94a3b8;
  cursor: crosshair;
}
.dot:hover { border-color: var(--accent); background: var(--accent-soft); }
.port.k-add .dot { border-style: dashed; }

/* Inspector */
#inspector {
  width: 360px;
  overflow-y: auto;
  background: var(--panel);
  border-left: 1px solid var(--line);
  padding: 14px 16px 40px;
}
#inspector h2 { font-size: 15px; margin: 0; }
#inspector h3 { font-size: 13px; margin: 18px 0 6px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.panel-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.field { display: block; margin: 12px 0; }
.field > .label { display: block; font-weight: 600; font-size: 12.5px; margin-bottom: 4px; }
.hint, .note { display: block; color: var(--muted); font-size: 12px; margin-top: 4px; }
.row { display: flex; gap: 6px; align-items: center; }
.counted { position: relative; }
.counter { display: block; text-align: right; font-size: 11px; color: var(--muted); }
.counter.over { color: var(--danger); font-weight: 600; }
.opt { border: 1px solid var(--line); border-radius: 8px; padding: 8px; margin-bottom: 8px; background: #fafbfc; }
.opt-top { display: flex; gap: 4px; align-items: flex-start; }
.opt-top .counted { flex: 1; }
.opt .num { font-weight: 700; color: var(--muted); padding: 6px 2px; min-width: 16px; }
.opt-target { display: flex; gap: 6px; align-items: center; margin-top: 6px; font-size: 12px; color: var(--muted); }
.opt-target select { flex: 1; }
.kw { display: flex; gap: 6px; margin-bottom: 6px; }
.kw input { flex: 1; }
.kw select { flex: 1; }
hr { border: none; border-top: 1px solid var(--line); margin: 18px 0; }
.problem { display: block; width: 100%; text-align: left; background: #fef2f2; color: var(--danger); border: 1px solid #f3c4c4; border-radius: 6px; padding: 6px 8px; margin-bottom: 6px; font-size: 12.5px; }
.problem.warn { background: #fffbeb; color: var(--warn); border-color: #fde3a7; }
.ok { color: var(--ok); }

/* Preview */
#preview {
  width: 330px;
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--line);
  background: #efeae2;
}
#preview.hidden { display: none; }
.phone-head { display: flex; justify-content: space-between; align-items: center; padding: 10px 12px; background: #075e54; color: #fff; }
.phone-head small { display: block; opacity: .8; font-size: 11px; }
#chat { flex: 1; overflow-y: auto; padding: 12px 10px; display: flex; flex-direction: column; gap: 8px; }
.bubble { max-width: 85%; padding: 6px 9px; border-radius: 8px; font-size: 13.5px; box-shadow: 0 1px 1px rgba(0,0,0,.08); }
.bubble.bot { background: #fff; align-self: flex-start; }
.bubble.user { background: #d9fdd3; align-self: flex-end; }
.bubble.sys { background: #fff8d6; align-self: center; font-size: 12px; color: #5c4a00; max-width: 95%; }
.bubble .btns { display: flex; flex-direction: column; gap: 4px; margin-top: 6px; border-top: 1px solid #eee; padding-top: 4px; }
.bubble .btns button, .bubble .row-opt { background: #fff; color: #027eb5; border: none; padding: 5px; text-align: center; }
.bubble .btns button:hover, .bubble .row-opt:hover { background: #f3f7fa; }
.bubble .rows { margin-top: 4px; border-top: 1px solid #eee; }
.bubble .rows.hidden { display: none; }
.bubble .row-opt { display: block; width: 100%; text-align: left; color: var(--text); border-bottom: 1px solid #f2f2f2; }
.bubble .row-opt small { display: block; color: var(--muted); }
.bubble .tpl small { display: block; color: var(--muted); }
#chatForm { display: flex; gap: 6px; padding: 8px; background: #f0f0f0; }
#chatForm input { flex: 1; border: none; border-radius: 18px; padding: 8px 12px; }
#chatForm button { border-radius: 18px; background: #075e54; border-color: #075e54; }

/* Pop-up menu and toast */
.menu {
  position: fixed;
  z-index: 50;
  width: 250px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0,0,0,.14);
  padding: 6px;
}
.menu-title { font-size: 12px; color: var(--muted); padding: 4px 8px; }
.menu button { display: block; width: 100%; text-align: left; background: #fff; color: var(--text); border: none; padding: 6px 8px; }
.menu button:hover { background: var(--accent-soft); }
.menu button small { display: block; color: var(--muted); font-size: 11.5px; }
#toast {
  position: fixed;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%);
  background: #1f2430;
  color: #fff;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s;
  max-width: 80vw;
  z-index: 60;
}
#toast.show { opacity: 1; }
#toast.err { background: var(--danger); }