:root {
  --bg: #0d0f14; --bg-2: #12151c; --bg-3: #181c26; --bg-4: #1e2330;
  --border: rgba(255,255,255,0.08); --border-bright: rgba(255,255,255,0.18);
  --text: #e8eaf0; --text-dim: #7a8299; --text-dimmer: #4a5168;
  --accent: #4de8b2; --accent-dim: rgba(77,232,178,0.15);
  --accent-2: #7c6ff7; --accent-2-dim: rgba(124,111,247,0.15);
  --danger: #ff5a5a;
  --node-fn-text: #90caff; --node-cond-text: #c4a0ff;
  --edge-default: #4de8b2; --edge-return: #ff8f4d; --edge-param: #7c6ff7; --edge-cond: #f7d96f;
  --toolbar-h: 52px; --radius: 10px; --radius-sm: 6px;
  --shadow: 0 4px 24px rgba(0,0,0,0.5); --shadow-lg: 0 8px 48px rgba(0,0,0,0.7);
  --font-mono: 'Martian Mono', monospace; --font-ui: 'DM Sans', sans-serif;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; background: var(--bg); color: var(--text); font-family: var(--font-ui); }

/* ── Layout ── */
#app { display: flex; flex-direction: column; height: 100vh; }

#toolbar {
  height: var(--toolbar-h); background: var(--bg-2); border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 4px; padding: 0 12px;
  flex-shrink: 0; z-index: 100; user-select: none;
}
.toolbar-brand {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 13px; font-weight: 500; color: var(--accent);
  letter-spacing: 0.05em; margin-right: 8px; padding-right: 12px;
  border-right: 1px solid var(--border); white-space: nowrap;
}
.toolbar-actions { display: flex; align-items: center; gap: 2px; flex: 1; }
.toolbar-right   { display: flex; align-items: center; gap: 3px; margin-left: auto; }

.tool-btn {
  display: flex; align-items: center; gap: 5px; padding: 5px 9px;
  background: transparent; border: 1px solid transparent; border-radius: var(--radius-sm);
  color: var(--text-dim); font-family: var(--font-ui); font-size: 12px; cursor: pointer;
  transition: all 0.15s; white-space: nowrap;
}
.tool-btn:hover  { background: var(--bg-3); color: var(--text); border-color: var(--border); }
.tool-btn.active { background: var(--accent-dim); color: var(--accent); border-color: rgba(77,232,178,0.3); }
.tool-btn.icon-only { padding: 5px 8px; font-size: 15px; }
.toolbar-sep { width: 1px; height: 22px; background: var(--border); margin: 0 3px; }
.zoom-label { font-family: var(--font-mono); font-size: 11px; color: var(--text-dim); min-width: 38px; text-align: center; }
.status-msg { font-size: 11px; color: var(--accent); font-family: var(--font-mono); opacity: 0; transition: opacity 0.3s; margin-right: 8px; }
.status-msg.visible { opacity: 1; }

/* ── Main area ── */
#main-area { flex: 1; display: flex; overflow: hidden; }

#canvas-wrap {
  flex: 1; overflow: hidden; position: relative; background: var(--bg); cursor: default;
  transition: flex 0.25s cubic-bezier(0.22,1,0.36,1);
}
#canvas-wrap.tool-connect { cursor: crosshair; }
#canvas-wrap.tool-pan     { cursor: grab; }
#canvas-wrap.tool-pan:active { cursor: grabbing; }

#svg-canvas { width: 100%; height: 100%; display: block; }

/* ── Info Panel ── */
.info-panel {
  width: 272px; min-width: 272px; background: var(--bg-2);
  border-left: 1px solid var(--border); display: flex; flex-direction: column; overflow: hidden;
  transition: width 0.25s cubic-bezier(0.22,1,0.36,1), min-width 0.25s, opacity 0.2s;
  z-index: 40;
}
.info-panel--hidden { width: 0 !important; min-width: 0 !important; opacity: 0; pointer-events: none; border-left-color: transparent; }

.info-panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 13px 14px 11px; border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.info-panel-title {
  font-family: var(--font-mono); font-size: 11px; font-weight: 500;
  letter-spacing: 0.07em; text-transform: uppercase; color: var(--text-dim);
}
.info-panel-close {
  background: none; border: none; color: var(--text-dimmer); cursor: pointer;
  font-size: 13px; padding: 2px 4px; border-radius: 4px; transition: color 0.15s; line-height: 1;
}
.info-panel-close:hover { color: var(--text); }

.info-panel-body { padding: 14px; overflow-y: auto; flex: 1; display: flex; flex-direction: column; }

/* Info panel content */
.ip-section    { margin-bottom: 14px; }
.ip-label      { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-dimmer); margin-bottom: 5px; }
.ip-value      { font-family: var(--font-mono); font-size: 12px; color: var(--text); word-break: break-word; }
.ip-value.ip-name { font-size: 15px; font-weight: 500; color: var(--accent); letter-spacing: 0.02em; }
.ip-badge      { display: inline-block; background: rgba(255,143,77,0.15); border: 1px solid rgba(255,143,77,0.35); color: var(--edge-return); font-family: var(--font-mono); font-size: 11px; padding: 2px 8px; border-radius: 10px; }
.ip-badge.param{ background: rgba(124,111,247,0.15); border-color: rgba(124,111,247,0.35); color: var(--edge-param); }
.ip-badge.cond { background: rgba(247,217,111,0.15); border-color: rgba(247,217,111,0.35); color: var(--edge-cond); }
.ip-param-list { list-style: none; display: flex; flex-direction: column; gap: 5px; margin-top: 4px; }
.ip-param-item { background: var(--bg-3); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 6px 9px; }
.ip-param-name { font-family: var(--font-mono); font-size: 12px; color: var(--text); }
.ip-param-type { font-family: var(--font-mono); font-size: 10px; color: var(--edge-param); margin-top: 1px; }
.ip-param-ex   { font-family: var(--font-mono); font-size: 10px; color: var(--text-dimmer); margin-top: 1px; font-style: italic; }
.ip-divider    { height: 1px; background: var(--border); margin: 2px 0 14px; }
.ip-notes      { font-family: var(--font-ui); font-size: 12px; color: var(--text-dim); line-height: 1.6; white-space: pre-wrap; word-break: break-word; }
.ip-size-tag   { font-family: var(--font-mono); font-size: 11px; color: var(--text-dim); }
.ip-size-tag span { color: var(--accent-2); }
.ip-type-chip  { display: inline-flex; align-items: center; gap: 5px; background: var(--bg-3); border: 1px solid var(--border); border-radius: 4px; padding: 3px 8px; font-family: var(--font-mono); font-size: 11px; color: var(--text-dim); }
.ip-type-chip.fn   { border-color: rgba(58,143,255,0.3);  color: var(--node-fn-text); }
.ip-type-chip.cond { border-color: rgba(155,111,255,0.3); color: var(--node-cond-text); }
.ip-edit-btn   { margin-top: auto; padding-top: 12px; }
.ip-edit-btn button {
  width: 100%; background: var(--bg-3); border: 1px solid var(--border-bright);
  border-radius: var(--radius-sm); color: var(--text-dim); font-family: var(--font-mono);
  font-size: 11px; padding: 8px; cursor: pointer; transition: all 0.15s;
  letter-spacing: 0.04em; text-transform: uppercase;
}
.ip-edit-btn button:hover { background: var(--accent-dim); color: var(--accent); border-color: rgba(77,232,178,0.3); }

/* ── Nodes ── */
.node { cursor: move; }
.node.selected .node-border { stroke-width: 2.5 !important; }

.node-label    { font-family: var(--font-mono); font-weight: 500; fill: var(--text); dominant-baseline: middle; text-anchor: middle; pointer-events: none; }
.node-sublabel { font-family: var(--font-ui); font-size: 9.5px; fill: var(--text-dim); dominant-baseline: middle; text-anchor: middle; pointer-events: none; }

.port { fill: var(--bg-3); stroke: var(--border-bright); stroke-width: 1.5; cursor: crosshair; transition: fill 0.15s; }
.port:hover { fill: var(--accent); }
.port.port-in:hover { fill: var(--accent-2); }

/* ── Edges ── */
.edge      { fill: none; stroke-width: 1.8; cursor: pointer; transition: stroke-width 0.15s; }
.edge:hover, .edge.selected { stroke-width: 3; }
.edge.selected { filter: url(#glow); }
.edge-hit  { fill: none; stroke: transparent; stroke-width: 16; cursor: pointer; }
.edge-label    { font-family: var(--font-mono); font-size: 10px; fill: var(--text-dim); dominant-baseline: middle; text-anchor: middle; pointer-events: none; }
.edge-label-bg { fill: var(--bg-2); }

/* ── Minimap ── */
#minimap {
  position: absolute; bottom: 48px; right: 14px; width: 160px; height: 100px;
  border-radius: var(--radius-sm); border: 1px solid var(--border);
  background: var(--bg-2); opacity: 0.85; cursor: pointer; z-index: 50;
}
#minimap:hover { opacity: 1; }

/* ── Help bar ── */
#help-bar {
  position: absolute; bottom: 12px; left: 50%; transform: translateX(-50%);
  background: var(--bg-2); border: 1px solid var(--border); border-radius: 20px;
  padding: 6px 16px; font-size: 11px; color: var(--text-dimmer); white-space: nowrap;
  pointer-events: none; z-index: 50;
}
#help-bar kbd {
  background: var(--bg-4); border: 1px solid var(--border-bright); border-radius: 3px;
  padding: 1px 4px; font-family: var(--font-mono); font-size: 10px; color: var(--text-dim);
}

/* ── Modals ── */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.65);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000; backdrop-filter: blur(4px); animation: fadeIn 0.15s ease;
}
.modal-overlay[hidden] { display: none !important; }
@keyframes fadeIn  { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(16px) scale(0.97); } to { opacity: 1; transform: none; } }

.modal-box {
  background: var(--bg-2); border: 1px solid var(--border-bright); border-radius: var(--radius);
  width: 480px; max-width: calc(100vw - 32px); max-height: calc(100vh - 40px);
  overflow: hidden; display: flex; flex-direction: column;
  box-shadow: var(--shadow-lg); animation: slideUp 0.2s cubic-bezier(0.22,1,0.36,1);
}
.modal-box--sm { width: 380px; }
.modal-box--xs { width: 320px; }

.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 16px 20px 14px; border-bottom: 1px solid var(--border); }
.modal-header h2 { font-family: var(--font-mono); font-size: 13px; font-weight: 500; color: var(--text); letter-spacing: 0.04em; }
.modal-close { background: none; border: none; color: var(--text-dim); cursor: pointer; font-size: 14px; padding: 2px 4px; border-radius: 4px; transition: color 0.15s; }
.modal-close:hover { color: var(--text); }
.modal-body   { padding: 18px 20px; overflow-y: auto; flex: 1; display: flex; flex-direction: column; gap: 0; }
.modal-footer { display: flex; align-items: center; justify-content: flex-end; gap: 8px; padding: 12px 20px; border-top: 1px solid var(--border); }

.field-label { display: block; font-size: 11px; font-family: var(--font-mono); color: var(--text-dim); letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 6px; margin-top: 14px; }
.field-label:first-child { margin-top: 0; }
.field-label .req { color: var(--danger); }
.field-label.mt  { margin-top: 16px; }

.field-input { width: 100%; background: var(--bg-3); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); font-family: var(--font-mono); font-size: 12px; padding: 8px 10px; outline: none; transition: border-color 0.15s; resize: vertical; }
.field-input:focus { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-dim); }
.field-input::placeholder { color: var(--text-dimmer); }
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }

.field-section-header { display: flex; align-items: center; justify-content: space-between; margin-top: 16px; margin-bottom: 6px; }

.param-row  { display: grid; grid-template-columns: 1fr 1fr 1fr 28px; gap: 6px; margin-bottom: 6px; animation: slideUp 0.15s ease; }
.branch-row { display: grid; grid-template-columns: 1fr 28px; gap: 6px; margin-bottom: 6px; }
.param-row .field-input, .branch-row .field-input { margin: 0; }

.btn-remove { background: none; border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text-dim); cursor: pointer; font-size: 14px; display: flex; align-items: center; justify-content: center; transition: all 0.15s; }
.btn-remove:hover { background: rgba(255,90,90,0.15); color: var(--danger); border-color: var(--danger); }

.btn-small   { background: var(--bg-3); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--accent); font-family: var(--font-mono); font-size: 11px; padding: 4px 9px; cursor: pointer; transition: all 0.15s; }
.btn-small:hover { background: var(--accent-dim); border-color: rgba(77,232,178,0.3); }
.btn-primary { background: var(--accent); border: none; border-radius: var(--radius-sm); color: #000; font-family: var(--font-mono); font-size: 12px; font-weight: 700; padding: 7px 16px; cursor: pointer; transition: filter 0.15s; letter-spacing: 0.03em; }
.btn-primary:hover { filter: brightness(1.1); }
.btn-ghost   { background: none; border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text-dim); font-family: var(--font-mono); font-size: 12px; padding: 7px 14px; cursor: pointer; transition: all 0.15s; }
.btn-ghost:hover { background: var(--bg-3); color: var(--text); border-color: var(--border-bright); }
.btn-danger  { background: var(--danger); border: none; border-radius: var(--radius-sm); color: #fff; font-family: var(--font-mono); font-size: 12px; font-weight: 700; padding: 7px 16px; cursor: pointer; transition: filter 0.15s; }
.btn-danger:hover { filter: brightness(1.15); }

/* ── Size override row ── */
.size-override-row { display: flex; align-items: center; gap: 10px; margin-top: 4px; }
.size-slider  { flex: 1; accent-color: var(--accent); height: 4px; cursor: pointer; }
.size-val     { font-family: var(--font-mono); font-size: 12px; color: var(--accent); min-width: 28px; text-align: right; }

/* ── Color picker ── */
.color-row { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 2px; }
.color-swatch { width: 26px; height: 26px; border-radius: 50%; border: 2px solid transparent; cursor: pointer; transition: transform 0.15s; }
.color-swatch.selected { border-color: var(--text) !important; transform: scale(1.1); }
.color-swatch:hover    { transform: scale(1.1); }
.color-swatch-custom   { width: 26px; height: 26px; border-radius: 50%; border: 2px dashed var(--border-bright); cursor: pointer; background: var(--bg-3); display: flex; align-items: center; justify-content: center; font-size: 14px; color: var(--text-dim); position: relative; overflow: hidden; transition: all 0.15s; }
.color-swatch-custom:hover { border-color: var(--text-dim); }
.color-swatch-custom input[type=color] { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }

/* ── Radio group ── */
.radio-group { display: flex; gap: 12px; flex-wrap: wrap; }
.radio-group label { display: flex; align-items: center; gap: 5px; font-size: 12px; color: var(--text-dim); cursor: pointer; font-family: var(--font-mono); transition: color 0.15s; }
.radio-group label:hover { color: var(--text); }
.radio-group input[type=radio] { accent-color: var(--accent); }

/* ── Edge tooltip ── */
.edge-tooltip { position: fixed; background: var(--bg-2); border: 1px solid var(--border-bright); border-radius: var(--radius-sm); padding: 8px 12px; font-family: var(--font-mono); font-size: 11px; color: var(--text); pointer-events: none; z-index: 900; max-width: 220px; box-shadow: var(--shadow); animation: fadeIn 0.1s ease; }
.edge-tooltip[hidden] { display: none; }
.tt-type    { color: var(--text-dim); font-size: 10px; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 4px; }
.tt-data    { color: var(--accent); }
.tt-example { color: var(--text-dim); font-size: 10px; margin-top: 3px; }

/* ── Context menu ── */
#ctx-menu { position: fixed; background: var(--bg-2); border: 1px solid var(--border-bright); border-radius: var(--radius-sm); padding: 4px; z-index: 2000; min-width: 160px; box-shadow: var(--shadow-lg); animation: slideUp 0.12s ease; }
#ctx-menu button { display: block; width: 100%; text-align: left; background: none; border: none; color: var(--text-dim); font-family: var(--font-ui); font-size: 12.5px; padding: 7px 10px; border-radius: 4px; cursor: pointer; transition: all 0.12s; }
#ctx-menu button:hover { background: var(--bg-3); color: var(--text); }
#ctx-menu .ctx-danger { color: var(--danger) !important; }
#ctx-menu .ctx-sep { height: 1px; background: var(--border); margin: 3px 0; }

/* ── Selection box ── */
#selection-box { fill: rgba(77,232,178,0.06); stroke: var(--accent); stroke-width: 1; stroke-dasharray: 4 2; pointer-events: none; }

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bg-4); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--border-bright); }

/* ── Search bar ── */
.search-wrap {
  display: flex; align-items: center; gap: 6px;
  background: var(--bg-3); border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 4px 8px;
  margin: 0 6px; transition: border-color 0.15s;
  min-width: 200px; max-width: 260px;
}
.search-wrap:focus-within { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-dim); }
.search-icon { color: var(--text-dimmer); flex-shrink: 0; }
.search-input {
  flex: 1; background: none; border: none; outline: none;
  color: var(--text); font-family: var(--font-mono); font-size: 11.5px;
  min-width: 0;
}
.search-input::placeholder { color: var(--text-dimmer); }
.search-count { font-family: var(--font-mono); font-size: 10px; color: var(--text-dimmer); white-space: nowrap; flex-shrink: 0; }
.search-clear {
  background: none; border: none; color: var(--text-dimmer); cursor: pointer;
  font-size: 11px; padding: 0 2px; line-height: 1; transition: color 0.15s;
  opacity: 0; pointer-events: none;
}
.search-clear:hover { color: var(--text); }

/* ── Selection box (now a div overlay in screen space) ── */
#selection-box-div {
  position: absolute; pointer-events: none; z-index: 10;
  border: 1px solid var(--accent); background: rgba(77,232,178,0.06);
  border-radius: 2px;
  /* dashed via outline trick */
  box-shadow: 0 0 0 1px rgba(77,232,178,0.3);
}

/* ── Zone tool cursor ── */
#canvas-wrap.tool-zone { cursor: crosshair; }

/* ── Zone nodes in SVG ── */
.zone-handle { opacity: 0.6; transition: opacity 0.15s; }
.zone-handle:hover { opacity: 1; }

/* ── Zone color swatches ── */
.zone-color-swatch {
  width: 26px; height: 26px; border-radius: 6px; cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
}
.zone-color-swatch:hover    { transform: scale(1.1); }
.zone-color-swatch.selected { transform: scale(1.1); box-shadow: 0 0 0 2px var(--text); }

/* ── Loop variables ── */
:root { --loop-accent: #ffc850; --loop-accent-dim: rgba(255,200,80,0.12); }

/* ── Loop box on main canvas ── */
.loop-box-group { cursor: pointer; }
.loop-box-rect {
  transition: filter 0.15s;
}
.loop-box-group:hover .loop-box-rect { filter: brightness(1.2); }
.loop-box-enter-btn {
  cursor: pointer; opacity: 0.8; transition: opacity 0.15s;
}
.loop-box-group:hover .loop-box-enter-btn { opacity: 1; }

/* ── Loop modal overlay ── */
.loop-modal-overlay {
  position: fixed; inset: 0; z-index: 500;
  background: var(--bg); display: flex; flex-direction: column;
  animation: fadeIn 0.18s ease;
}
.loop-modal-overlay[hidden] { display: none; }

.loop-modal-box {
  display: flex; flex-direction: column; height: 100%;
}

.loop-modal-header {
  height: var(--toolbar-h); background: rgba(255,200,80,0.06);
  border-bottom: 1px solid rgba(255,200,80,0.25);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 14px; flex-shrink: 0; gap: 12px; user-select: none;
}
.loop-modal-title-wrap {
  display: flex; align-items: center; gap: 8px; flex-shrink: 0;
}
.loop-modal-label {
  font-family: var(--font-mono); font-size: 11px; color: var(--loop-accent);
  letter-spacing: 0.08em; text-transform: uppercase; opacity: 0.8;
}
.loop-modal-name {
  font-family: var(--font-mono); font-size: 14px; font-weight: 600;
  color: var(--loop-accent); letter-spacing: 0.04em;
}
.loop-modal-actions {
  display: flex; align-items: center; gap: 4px; margin-left: auto;
}

.loop-canvas-wrap {
  flex: 1; position: relative; overflow: hidden; background: var(--bg);
  border: 2px solid rgba(255,200,80,0.15); border-top: none;
}

.loop-help-bar {
  position: absolute; bottom: 10px; left: 50%; transform: translateX(-50%);
  background: rgba(18,21,28,0.88); border: 1px solid var(--border);
  border-radius: 20px; padding: 5px 16px; font-size: 10.5px; font-family: var(--font-mono);
  color: var(--text-dimmer); pointer-events: none; white-space: nowrap;
}
.loop-help-bar kbd {
  background: var(--bg-3); border: 1px solid var(--border-bright);
  border-radius: 3px; padding: 0 4px; font-size: 9.5px; color: var(--text-dim);
}

/* Loop condition node badge */
.loop-cond-badge {
  pointer-events: none;
}

/* ── Loop breadcrumb ── */
.loop-breadcrumb {
  height: 28px; background: rgba(255,200,80,0.04);
  border-bottom: 1px solid rgba(255,200,80,0.15);
  display: flex; align-items: center; padding: 0 14px; gap: 4px;
  font-family: var(--font-mono); font-size: 11px; color: var(--text-dimmer);
  flex-shrink: 0; user-select: none; overflow-x: auto;
}
.loop-breadcrumb-item {
  color: var(--loop-accent); opacity: 0.7; cursor: pointer;
  padding: 1px 4px; border-radius: 3px; transition: opacity 0.15s;
  white-space: nowrap;
}
.loop-breadcrumb-item:hover { opacity: 1; background: rgba(255,200,80,0.1); }
.loop-breadcrumb-item.current { opacity: 1; cursor: default; }
.loop-breadcrumb-sep {
  color: var(--text-dimmer); opacity: 0.5; font-size: 10px;
}

/* ── Loop info panel (inside loop modal) ── */
.loop-info-panel {
  position: absolute; top: 0; right: 0; height: 100%;
  z-index: 600; border-left: 1px solid rgba(255,200,80,0.25) !important;
}