*{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0d1117;--panel:#161b22;--panel2:#1c2128;--border:#30363d;
  --accent:#34D399;--green:#3fb950;--red:#f85149;--text:#e6edf3;--muted:#8b949e;
}
/* ─── RESET & BASE ─────────────────────────────────────────────────────── */
*{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0d1117;--panel:#161b22;--border:#30363d;
  --text:#e6edf3;--muted:#8b949e;--accent:#34D399;
  --red:#ff4444;--green:#3fb950;
  --topbar-h:44px;--statusbar-h:26px;--sidebar-w:200px;
}
body{background:var(--bg);color:var(--text);font-family:'Segoe UI',system-ui,sans-serif;
  font-size:12px;display:flex;flex-direction:column;height:100vh;overflow:hidden;}

/* ─── TOPBAR ────────────────────────────────────────────────────────────── */
#topbar{
  height:var(--topbar-h);background:var(--panel);border-bottom:1px solid var(--border);
  display:flex;align-items:center;gap:4px;padding:0 8px;flex-shrink:0;overflow-x:auto;
}
#topbar h1{font-size:20px;font-weight:600;white-space:nowrap;margin-right:4px; color:var(--accent); font-family: 'JetBrains Mono', 'Fira Code', monospace;}
.sep{width:1px;height:20px;background:var(--border);margin:0 4px;flex-shrink:0;}
.btn{
  background:transparent;border:1px solid var(--border);color:var(--text);
  padding:3px 8px;border-radius:4px;cursor:pointer;font-size:13px;white-space:nowrap;
  transition:background .15s;
}
.btn:hover{background:rgba(88,166,255,.1);}
.btn.active{background:rgba(88,166,255,.2);border-color:var(--accent);color:var(--accent);}
.btn.danger{border-color:#f8514966;color:#f85149;}
.btn.danger:hover{background:rgba(248,81,73,.1);}
#swatches{display:flex;gap:3px;align-items:center;}
.sw{width:14px;height:14px;border-radius:50%;cursor:pointer;border:2px solid transparent;transition:.15s;}
.sw.active,.sw:hover{border-color:var(--text);transform:scale(1.2);}
#ccolor{width:22px;height:22px;border:none;border-radius:3px;cursor:pointer;padding:0;background:none;}
input[type=range]{accent-color:var(--accent);width:70px;}
#mode-badge{
  font-size:11px;font-weight:700;letter-spacing:.08em;color:var(--accent);
  background:rgba(88,166,255,.1);padding:2px 7px;border-radius:3px;white-space:nowrap;
}

/* ─── LAYOUT ─────────────────────────────────────────────────────────────── */
#layout{flex:1;display:flex;min-height:0;}

/* ─── SIDEBAR ───────────────────────────────────────────────────────────── */
#sidebar{
  width:var(--sidebar-w);background:var(--panel);border-right:1px solid var(--border);
  display:flex;flex-direction:column;flex-shrink:0;
}
#stabs{display:flex;border-bottom:1px solid var(--border);}
.stab{
  flex:1;padding:7px 4px;text-align:center;cursor:pointer;font-size:13px;
  color:var(--muted);border-bottom:2px solid transparent;transition:.15s;
}
.stab.active{color:var(--accent);border-color:var(--accent);}
.stab:hover:not(.active){color:var(--text);}
#sbody{flex:1;overflow-y:auto;padding:8px;}
.upzone{
  border:1.5px dashed var(--border);border-radius:6px;padding:16px 8px;
  text-align:center;cursor:pointer;color:var(--muted);font-size:13px;
  transition:.15s;
}
.upzone:hover{border-color:var(--accent);color:var(--text);}
.img-list{display:flex;flex-direction:column;gap:4px;margin-top:6px;}
.img-item{
  display:flex;align-items:center;gap:6px;padding:4px 6px;border-radius:4px;
  cursor:grab;border:1px solid transparent;transition:.15s;
}
.img-item:hover{background:rgba(255,255,255,.04);border-color:var(--border);}
.img-thumb{width:32px;height:32px;object-fit:contain;border-radius:3px;background:rgba(255,255,255,.05);}
.img-name{flex:1;font-size:13px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;padding-left:4px;}
.img-del,.node-del{
  background:none;border:none;color:#f85149;cursor:pointer;font-size:14px;
  padding:0 2px;opacity:.5;transition:.15s;line-height:1;
}
.img-del:hover,.node-del:hover{opacity:1;}

/* ─── CANVAS AREA ─────────────────────────────────────────────────────── */
#canvas-area{
  flex:1;position:relative;overflow:hidden; /* NO scrollbars */
  background:var(--bg);
}
/* zoom-layer is moved via CSS transform only */
#zoom-layer{position:absolute;top:0;left:0;transform-origin:top left;}

/* ─── IMAGE NODES ────────────────────────────────────────────────────── */
.img-node{
  position:absolute;user-select:none;
  border:1px solid transparent;border-radius:4px;transition:border-color .1s;
}
.img-node.selected{border-color:var(--accent);}
.img-node img{pointer-events:none;width:100%;height:100%;object-fit:contain;display:block;border-radius:3px;}
.resize-handle{
  position:absolute;right:-4px;bottom:-4px;width:10px;height:10px;
  background:var(--accent);border-radius:2px;cursor:se-resize;z-index:2;
}
.node-del{position:absolute;top:-8px;right:-8px;width:16px;height:16px;
  background:#f85149;color:#fff;border-radius:50%;font-size:11px;line-height:16px;
  text-align:center;opacity:0;z-index:3;}
.img-node.selected .node-del,.img-node:hover .node-del{opacity:1;}

/* ─── WIRES ─────────────────────────────────────────────────────────── */
.wire-path,.wire-preview{fill:none;stroke-linecap:round;stroke-linejoin:round;}
.wire-preview{stroke-dasharray:5 3;opacity:.8;}

/* ─── STATUSBAR ──────────────────────────────────────────────────────── */
#statusbar{
  height:var(--statusbar-h);background:var(--panel);border-top:1px solid var(--border);
  display:flex;align-items:center;gap:10px;padding:0 10px;flex-shrink:0;font-size:10px;color:var(--muted);
}
.sdot{width:6px;height:6px;border-radius:50%;background:var(--green);}
#statusbar span{white-space:nowrap;}

/* ─── TOAST ─────────────────────────────────────────────────────────── */
#toast{
  position:fixed;bottom:36px;left:50%;transform:translateX(-50%) translateY(10px);
  background:#1f2937;border:1px solid var(--border);color:var(--text);
  padding:7px 16px;border-radius:6px;font-size:11px;pointer-events:none;
  opacity:0;transition:opacity .2s,transform .2s;z-index:999;
}
#toast.show{opacity:1;transform:translateX(-50%) translateY(0);}

#tab-flow { display:none; }
.flow-shape-btn {
  display:flex; align-items:center; gap:8px;
  width:100%; padding:6px 10px; margin-bottom:4px;
  background:#161b22; border:1px solid #30363d;
  border-radius:6px; color:#cdd9e5; font-size:11px;
  cursor:grab; user-select:none; text-align:left; box-sizing:border-box;
}
.flow-shape-btn:hover { background:#21262d; border-color:#58a6ff; }
.flow-shape-btn svg { flex-shrink:0; }
.flow-shape-section { font-size:10px; color:#6e7681; padding:6px 4px 2px; text-transform:uppercase; letter-spacing:.5px; }
.flow-node {
  position:absolute; user-select:none; cursor:move;
  display:flex; align-items:center; justify-content:center;
}
.flow-node.selected .flow-shape-svg rect,
.flow-node.selected .flow-shape-svg polygon,
.flow-node.selected .flow-shape-svg ellipse { stroke:#58a6ff !important; stroke-width:2.5px !important; }
.flow-node-edit {
  position:absolute; bottom:-22px; left:50%; transform:translateX(-50%);
  font-size:11px; background:#161b22; color:#cdd9e5;
  border:1px solid #58a6ff; border-radius:3px; padding:1px 5px;
  min-width:60px; text-align:center; outline:none; z-index:20;
}
.flow-node-del {
  position:absolute; top:-8px; right:-8px; width:16px; height:16px;
  background:#e53e3e; color:#fff; border:none; border-radius:50%;
  font-size:10px; cursor:pointer; display:none; align-items:center; justify-content:center;
  z-index:15; line-height:1;
}
.flow-node:hover .flow-node-del, .flow-node.selected .flow-node-del { display:flex; }