:root{
  --bg:#0f1115; --panel:#171a21; --muted:#99a1b3; --text:#e6e9f2; --accent:#6aa7ff;
  --border:#262a33; --accent-2:#7bd389; --topbar-h:56px; --mtb-h:56px;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--text);font:14px/1.4 ui-sans-serif,system-ui,Segoe UI,Roboto,Helvetica,Arial}
.topbar{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;padding:8px 12px;background:var(--panel);border-bottom:1px solid var(--border);min-height:var(--topbar-h)}
.brand{display:flex;align-items:baseline;gap:8px;font-weight:800;max-width:40vw;overflow:hidden;white-space:nowrap}
.brand .logo{font-weight:800;font-size:18px;background:linear-gradient(90deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent;letter-spacing:.2px}
.brand .tagline{color:var(--muted);font-weight:600;font-size:12px;opacity:.95;overflow:hidden;text-overflow:ellipsis}
@media (max-width:1100px){ .brand{max-width:28vw} }
@media (max-width:880px){ .brand .tagline{display:none} }

/* --- Mobile Layout --- */
.topbar-menu{display:none;background:transparent;border:none;color:var(--text);font-size:22px;line-height:1;padding:4px 6px;border-radius:6px;}
.topbar-menu:hover{background:#1a1f2a}
@media (max-width:768px){
  .topbar-menu{display:inline-block}
  .main{grid-template-columns:1fr !important}
  .sidebar{display:none;position:fixed;top:var(--topbar-h);bottom:0;width:80vw;max-width:320px;background:var(--panel);overflow:auto;z-index:20;transition:transform .25s ease;}
  .sidebar.left{left:0;border-right:1px solid var(--border);transform:translateX(-100%);}
  .sidebar.right{right:0;border-left:1px solid var(--border);transform:translateX(100%);} /* reserved */
  .sidebar.show{display:block;transform:translateX(0);}
  /* reduce canvas margin */
  #canvas-wrap{margin:12px auto;}
  .actions button,.actions select{font-size:11px;padding:4px 6px}
}
.actions{display:flex;flex-wrap:nowrap;gap:8px;max-width:calc(100vw - 240px);overflow-x:auto;overflow-y:hidden;white-space:nowrap}
.actions button,.actions select{white-space:nowrap;padding:4px 8px;font-size:12px;line-height:1}
.actions>*{margin-right:0}
.main{display:grid;grid-template-columns:300px 1fr 280px;height:calc(100vh - var(--topbar-h));}
.main>*, .workspace{min-width:0;min-height:0}
.sidebar{background:var(--panel);border-right:1px solid var(--border);overflow:auto}
.sidebar.right{border-left:1px solid var(--border);border-right:none}
.group{padding:12px 12px 14px;border-bottom:1px solid var(--border)}
.group .title{font-weight:600;margin-bottom:10px;color:var(--muted)}
.title-sm{font-weight:600;margin:8px 0 4px;color:var(--muted);font-size:12px;opacity:.95}

/* --- Mobile bottom toolbar --- */
.mobile-toolbar{display:none;position:fixed;left:0;right:0;bottom:0;z-index:25;background:rgba(19,22,30,.95);border-top:1px solid var(--border);padding:6px 10px;justify-content:center;backdrop-filter:saturate(120%) blur(6px);gap:6px 8px}
.mobile-toolbar button{background:#2a3142;color:#fff;border:none;border-radius:10px;padding:8px 10px;font-size:13px;min-width:38px;flex:0 0 auto}
@media (max-width:768px){ .mobile-toolbar{display:flex;flex-wrap:wrap} }

/* Language popover */
.mobile-popover{position:fixed;bottom:calc(var(--mtb-h, 56px) + 8px);right:12px;background:var(--panel);border:1px solid var(--border);border-radius:10px;box-shadow:0 8px 28px rgba(0,0,0,.35);padding:8px;z-index:26}
.mobile-popover a{display:block;color:var(--text);text-decoration:none;padding:6px 10px;border-radius:8px}
.mobile-popover a:hover{background:#1b2230}
.help-icon{background:#2a3142;color:#fff;border:none;border-radius:50%;width:26px;height:26px;line-height:26px;text-align:center;cursor:pointer}
.help-icon:hover{filter:brightness(1.1)}
.help-popover{position:fixed;max-width:min(520px,92vw);background:var(--panel);border:1px solid var(--border);border-radius:10px;box-shadow:0 8px 28px rgba(0,0,0,.35);padding:10px 12px;z-index:27}
.help-popover code{background:#131826;border:1px solid var(--border);padding:1px 4px;border-radius:4px}
.tool,button{background:#1f2430;color:var(--text);border:1px solid var(--border);padding:6px 10px;border-radius:6px;cursor:pointer}
.sidebar .tool,.sidebar .group button{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tool.active,button:hover{border-color:var(--accent)}
button.btn-primary{background:var(--accent);color:#000;border-color:var(--accent);font-weight:700}
button.btn-primary:hover{filter:brightness(1.05)}
/* Re-override generic button for circular help icon */
button.help-icon{background:#2a3142 !important;color:#fff;border:none !important;border-radius:50% !important;width:26px;height:26px;line-height:26px;text-align:center;padding:0}
textarea,select,input[type=number],input[type=text],input[type=password]{width:100%;background:#10131a;color:var(--text);border:1px solid var(--border);border-radius:6px;padding:6px}
textarea{resize:vertical}
.text-button{background:transparent;border:none;color:var(--muted);padding:4px 6px;cursor:pointer;border-radius:4px}
.text-button:hover{color:var(--text);background:#1a1f2a}
.text-button:focus-visible{outline:2px solid var(--accent)}

/* Improve touch interactions on canvas */
#canvas-stage, svg.board{ touch-action: none; }
.sidebar button+button{margin-left:6px}
.control-row{display:flex;gap:8px;align-items:center}
.control-row.wrap{flex-wrap:wrap}
.control-row.wrap > input[type=text]{flex:1 1 240px}
.control-row.wrap > .help-icon{flex:0 0 auto}
.control-row > select,
.control-row > input[type=text],
.control-row > input[type=password]{flex:1;min-width:0}
.control-row .hint{white-space:nowrap}
.sidebar input::placeholder,.sidebar textarea::placeholder{color:#8c93a5}
.sticky-actions{position:sticky;top:0;background:var(--panel);padding:6px 0;z-index:2;border-bottom:1px solid var(--border)}
.plan-results{display:flex;flex-direction:column;gap:8px}
.plan-item{background:#1f2430;border:1px solid var(--border);border-radius:8px;padding:8px}
.plan-hd{display:flex;align-items:center;gap:8px;margin-bottom:4px}
.plan-idx{display:inline-flex;align-items:center;justify-content:center;width:20px;height:20px;border-radius:50%;background:var(--accent);color:#000;font-weight:700;font-size:12px}
.plan-title{font-weight:600}
.plan-summary{white-space:pre-wrap;color:var(--text);opacity:0.95}
.plan-dialogs{list-style:none;margin:6px 0 0 0;padding:0}
.plan-dialogs li{margin:2px 0}
.plan-dialogs .speaker{color:var(--accent-2)}
.plan-dialogs .text{color:var(--text)}
.plan-actions{margin-top:6px;text-align:right}
.workspace{display:flex;align-items:flex-start;justify-content:center;overflow:auto;background:radial-gradient(ellipse at center,#0e1117 0%,#0f1115 100%)}
#canvas-wrap{position:relative;display:inline-block;margin:24px}
#canvas-stage{position:relative;transform-origin:0 0}
/* Optional override: left alignment */
.workspace.align-left{justify-content:flex-start}
#canvas-wrap{position:relative;display:inline-block;margin:24px}
#canvas-stage{position:relative;transform-origin:0 0}
.workspace.grabbing{cursor:grabbing}
.workspace.grabbing *{cursor:grabbing !important}
#canvas-wrap .board-shadow{display:none}
.board{background:#fff}
.inspector-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}
.inspector-row input,.inspector-row select{width:60%}
.hint{color:var(--muted);font-size:12px}

/* SVG selection */
/* Let element attributes control fill/stroke so panels can be filled */
.panel{vector-effect:non-scaling-stroke}
.panel-mask{fill:none;stroke:#000;stroke-width:6}
.sel-box{fill:none;stroke:var(--accent);stroke-width:2;vector-effect:non-scaling-stroke}
.sel-box{pointer-events:none}
.handle{fill:#fff;stroke:var(--accent);stroke-width:1;vector-effect:non-scaling-stroke}
.handle{cursor:nwse-resize}
.bubble{fill:#fff;stroke:#000;stroke-width:4}

/* Splitter handles (hidden until hover to avoid overlay visuals) */
.splitter{stroke:var(--accent);stroke-opacity:0;stroke-width:4;cursor:ew-resize}
.splitter:hover{stroke-opacity:.35}
.splitter.h{cursor:ns-resize}
/* Gutter fill is set via SVG attributes to follow background color */
/* .gutter{fill:#fff} */
g[data-layer="gutters"], g[data-layer="gutters-top"], g[data-layer="seams"]{ shape-rendering:crispEdges }
svg .frame{fill:none;stroke:#000;stroke-linejoin:round;vector-effect:non-scaling-stroke}

/* Guides */
.guide{fill:none;stroke:var(--accent);stroke-width:2;stroke-dasharray:8 6;pointer-events:none;vector-effect:non-scaling-stroke}

/* Context menu */
.ctxmenu{position:fixed;z-index:1000;background:#1f2430;border:1px solid var(--border);border-radius:8px;padding:6px;box-shadow:0 10px 30px #0008}
.ctxmenu button{display:block;width:160px;text-align:left;margin:4px 0}

/* Modal */
.modal-overlay{position:fixed;inset:0;background:#0008;display:none;align-items:center;justify-content:center;z-index:1001}
.modal-overlay.show{display:flex}
.modal{background:#1f2430;border:1px solid var(--border);border-radius:12px;min-width:520px;max-width:800px;max-height:80vh;overflow:auto;box-shadow:0 20px 60px #000c}
.modal-hd{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;border-bottom:1px solid var(--border)}
.modal-title{font-weight:700}
.modal-close{background:transparent;border:1px solid var(--border);color:var(--text);border-radius:8px;padding:4px 8px;cursor:pointer}
.modal-close:hover{border-color:var(--accent)}
.modal-body{padding:12px}
.shortcuts{display:grid;grid-template-columns:220px 1fr;gap:6px 16px}
.sc-row{display:contents}
.sc-k{justify-self:end;color:var(--muted)}
.sc-t{justify-self:start}
.kbd{display:inline-block;min-width:18px;padding:2px 6px;margin:0 2px;background:#10131a;border:1px solid var(--border);border-radius:6px;font-family:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace}
.tip-list{margin:6px 0 0 18px}

/* Respect [hidden] attribute even if a class sets display */
[hidden]{display:none !important}
.modal-overlay[hidden]{display:none !important}