/* HVAC Duct Static Pressure Calculator — Redesign v2 */
/* Dark Engineering Theme: Space Grotesk / Inter / JetBrains Mono */

/* ===== Reset ===== */
*{margin:0;padding:0;box-sizing:border-box}

/* ===== Custom Properties ===== */
:root{
  color-scheme: dark;
  --bg:#0b0f19;--bg2:#131b2e;--bg3:#0d1220;
  --surface:#131b2e;--panel-accent:#1e293b;
  --border:rgba(255,255,255,0.05);--border-solid:#1e293b;
  --text:#f1f5f9;--textDim:#94a3b8;--textMuted:#8b9eb5;
  --accent:#0ea5e9;--accentDim:rgba(14,165,233,0.15);--accentBright:#7bd0ff;
  --primary:#0ea5e9;
  --danger:#ef4444;--success:#22c55e;--warn:#f59e0b;
}
[data-theme="light"]{
  color-scheme: light;
  --bg:#f8fafc;--bg2:#ffffff;--bg3:#f1f5f9;
  --surface:#ffffff;--panel-accent:#e2e8f0;
  --border:rgba(0,0,0,0.08);--border-solid:#e2e8f0;
  --text:#0f172a;--textDim:#475569;--textMuted:#374151;
  --accent:#0284c7;--accentDim:rgba(2,132,199,0.1);--accentBright:#0ea5e9;
  --primary:#0284c7;
  --danger:#dc2626;--success:#16a34a;--warn:#d97706;
}

/* ===== Base ===== */
html,body{height:100%;font-family:'Inter',system-ui,sans-serif;background:var(--bg);color:var(--text);overflow:hidden;font-size:13px}
body{display:flex;flex-direction:column}

/* ===== Scrollbars ===== */
::-webkit-scrollbar{width:4px;height:4px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--border-solid);border-radius:2px}
::-webkit-scrollbar-thumb:hover{background:#334155}
[data-theme="light"] ::-webkit-scrollbar-thumb{background:#cbd5e1}
[data-theme="light"] ::-webkit-scrollbar-thumb:hover{background:#94a3b8}

/* ===== Header ===== */
#header{display:flex;align-items:center;justify-content:space-between;padding:0 16px;background:#0d1220;border-bottom:1px solid var(--border);height:52px;flex-shrink:0;z-index:30}
[data-theme="light"] #header{background:#fff}
#header h1{font-family:'Space Grotesk',sans-serif;font-size:15px;font-weight:700;color:var(--accentBright);letter-spacing:-0.3px;white-space:nowrap}
.header-controls{display:flex;align-items:center;gap:8px;flex-wrap:nowrap}
.header-chips{display:flex;align-items:center;gap:4px}

/* Site condition chips */
.site-condition{font-size:11px;font-weight:700;font-family:'Inter',sans-serif;color:var(--textDim);text-transform:uppercase;letter-spacing:.05em;display:inline-flex;align-items:center;gap:6px;background:rgba(30,41,59,0.4);border:1px solid var(--border);padding:4px 10px;border-radius:4px}
[data-theme="light"] .site-condition{background:rgba(241,245,249,0.8);border-color:var(--border-solid)}
.site-label{color:var(--textMuted);font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.08em}
.site-unit{color:var(--textMuted);font-size:10px}
.site-value{font-family:'JetBrains Mono',monospace;font-size:12px;color:var(--accentBright);font-weight:500}
.site-condition input{width:52px;background:transparent;color:var(--accentBright);border:none;padding:0;font-size:12px;font-family:'JetBrains Mono',monospace;font-weight:500;text-align:right;outline:none}
.site-condition select{background:transparent;color:var(--accentBright);border:none;font-size:12px;font-family:'JetBrains Mono',monospace;outline:none}

/* Brand */
.brand{display:flex;align-items:center;gap:8px;flex-shrink:0}
.brand-icon{width:20px;height:20px;color:var(--accentBright);flex-shrink:0}

/* Header buttons */
.btn-primary{background:var(--accent);color:#fff;border:none;padding:6px 14px;border-radius:4px;cursor:pointer;font-size:11px;font-weight:700;font-family:'Space Grotesk',sans-serif;letter-spacing:.08em;text-transform:uppercase;display:inline-flex;align-items:center;gap:5px;transition:filter .15s}
.btn-primary:hover{filter:brightness(1.15)}
.btn-primary:active{transform:scale(.97)}
.btn-danger{background:transparent;color:var(--danger);border:1px solid rgba(239,68,68,0.3);padding:5px 10px;border-radius:4px;cursor:pointer;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;display:inline-flex;align-items:center;gap:4px}
.btn-danger:hover{background:rgba(239,68,68,0.1)}
.btn-save{background:transparent;color:var(--success);border:1px solid rgba(34,197,94,0.3);padding:5px 10px;border-radius:4px;cursor:pointer;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;display:inline-flex;align-items:center;gap:4px}
.btn-save:hover{background:rgba(34,197,94,0.1)}
.btn-load{background:transparent;color:var(--accent);border:1px solid rgba(14,165,233,0.3);padding:5px 10px;border-radius:4px;cursor:pointer;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;display:inline-flex;align-items:center;gap:4px}
.btn-load:hover{background:rgba(14,165,233,0.1)}
.toolbar-sep{width:1px;height:20px;background:var(--border);margin:0 2px;flex-shrink:0}
#btnTheme{background:transparent;border:1px solid var(--border);color:var(--textDim);width:30px;height:30px;border-radius:4px;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;transition:all .15s;padding:0}
#btnTheme:hover{color:var(--accentBright);border-color:rgba(14,165,233,0.3)}
.unit-toggle{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;cursor:pointer;color:var(--textDim);display:inline-flex;align-items:center;gap:5px}
.unit-toggle input{margin-right:2px}
.auth-status{font-size:12px;color:var(--textDim)}

/* ===== Main Layout ===== */
#main{display:flex;flex:1;overflow:hidden}

/* ===== Toolbar — Vertical Sidebar ===== */
#toolbar{width:56px;background:#0d1220;border-right:1px solid var(--border);display:flex;flex-direction:column;align-items:center;padding:8px 0;gap:2px;flex-shrink:0;overflow-y:auto;z-index:20}
[data-theme="light"] #toolbar{background:#f8fafc;border-right-color:var(--border-solid)}
#toolbar button{width:40px;height:40px;background:transparent;color:var(--textDim);border:1px solid transparent;border-radius:4px;cursor:pointer;font-size:0;display:flex;align-items:center;justify-content:center;transition:all .15s;position:relative;padding:0;min-height:unset;white-space:nowrap}
#toolbar button:hover{background:rgba(14,165,233,0.08);color:var(--accentBright);border-color:rgba(14,165,233,0.2)}
#toolbar button.active{background:rgba(14,165,233,0.12);color:var(--accentBright);border-color:rgba(14,165,233,0.3)}
#toolbar button:disabled{opacity:.25;cursor:not-allowed}
#toolbar button:disabled:hover{background:transparent;color:var(--textDim);border-color:transparent}
#toolbar .toolbar-sep{width:32px;height:1px;background:var(--border);margin:2px 0;flex-shrink:0}
#toolbar .icon-svg{width:18px;height:18px;display:block}
#toolbar .lucide{width:16px;height:16px;display:block;flex-shrink:0}
#toolbar .btn-del{color:var(--danger)!important}
#toolbar .btn-del:hover{background:rgba(239,68,68,0.1)!important;border-color:rgba(239,68,68,0.3)!important;color:var(--danger)!important}
/* Toggle pills in toolbar — icon only squares */
#toolbar .toggle-pill{width:40px;height:40px;background:transparent;border:1px solid transparent;border-radius:4px;cursor:pointer;font-size:0;display:flex;align-items:center;justify-content:center;color:var(--textMuted);transition:all .15s;padding:0;min-height:unset}
#toolbar .toggle-pill:hover{background:rgba(14,165,233,0.08);color:var(--accentBright);border-color:rgba(14,165,233,0.2)}
#toolbar .toggle-pill.active{background:rgba(14,165,233,0.1);color:var(--accent);border-color:rgba(14,165,233,0.25)}
#toolbar .toggle-pill .lucide{width:14px;height:14px}
/* Hide layoutDirLabel text in sidebar */
#toolbar #layoutDirLabel{display:none}
/* Toolbar text labels — hidden when collapsed, shown when expanded */
.tb-label{font-size:10px;font-family:'Inter',sans-serif;font-weight:600;color:inherit;letter-spacing:.03em;display:none;white-space:nowrap;text-transform:uppercase}
#toolbar.expanded .tb-label{display:block}
#toolbar.expanded{width:140px}
#toolbar.expanded button{width:auto;font-size:11px;justify-content:flex-start;padding:0 10px;gap:8px}
#toolbar.expanded .toggle-pill{width:auto;font-size:11px;justify-content:flex-start;padding:0 10px;gap:8px}
#toolbar.expanded #layoutDirLabel{display:inline}
#toolbar.expanded .toolbar-sep{width:auto;height:1px;background:var(--border);margin:4px 0;align-self:stretch}
/* Expand/collapse toggle button at bottom */
.toolbar-expand-spacer{flex:1}
.toolbar-expand-btn{width:40px;height:28px;background:transparent;color:var(--textMuted);border:1px solid transparent;border-radius:4px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s;padding:0;flex-shrink:0}
.toolbar-expand-btn:hover{background:rgba(14,165,233,0.08);color:var(--accentBright);border-color:rgba(14,165,233,0.2)}
.toolbar-expand-btn .lucide{width:14px;height:14px;transition:transform .2s}
#toolbar.expanded .toolbar-expand-btn .lucide{transform:rotate(180deg)}
#toolbar.expanded .toolbar-expand-btn{width:auto;padding:0 10px}

/* Properties panel collapse */
.props-header-row{display:flex;align-items:center;justify-content:space-between;padding:14px 14px 10px;border-bottom:1px solid var(--border);background:linear-gradient(180deg,rgba(255,255,255,0.03) 0%,transparent 100%);flex-shrink:0}
.props-header-row h3{padding:0;border-bottom:none;background:none;margin:0}
.panel-collapse-btn{background:transparent;color:var(--textMuted);border:1px solid transparent;border-radius:4px;cursor:pointer;width:24px;height:24px;display:flex;align-items:center;justify-content:center;padding:0;transition:all .15s;flex-shrink:0}
.panel-collapse-btn:hover{background:rgba(14,165,233,0.08);color:var(--accentBright);border-color:rgba(14,165,233,0.2)}
.panel-collapse-btn .lucide{width:14px;height:14px;transition:transform .2s}
#properties.collapsed{width:36px;min-width:36px;overflow:hidden}
#properties.collapsed .props-header-row{padding:10px 6px;justify-content:center}
#properties.collapsed .props-header-row h3{display:none}
#properties.collapsed #propsContent{display:none}
#properties.collapsed .panel-collapse-btn .lucide{transform:rotate(180deg)}

[data-theme="light"] #toolbar button{color:#64748b}
[data-theme="light"] #toolbar button:hover{background:rgba(2,132,199,0.08);color:var(--primary)}
[data-theme="light"] #toolbar .toggle-pill{color:#94a3b8}
[data-theme="light"] #toolbar .toggle-pill:hover{background:rgba(2,132,199,0.08);color:var(--primary)}
[data-theme="light"] #toolbar .toggle-pill.active{color:var(--accent)}

/* ===== Canvas ===== */
#canvas-wrap{flex:1;position:relative;overflow:auto;background:var(--bg);background-image:radial-gradient(circle,rgba(30,41,59,0.9) 1px,transparent 1px);background-size:24px 24px;box-shadow:inset 0 2px 12px rgba(0,0,0,0.4)}
#gridRect{fill:none!important}
[data-theme="light"] #canvas-wrap{background-color:var(--bg);background-image:radial-gradient(circle,rgba(148,163,184,0.4) 1px,transparent 1px)}
#diagram{width:100%;height:100%;display:block}
#emptyHint{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);color:var(--textDim);font-size:14px;font-family:'Space Grotesk',sans-serif;font-weight:600;letter-spacing:.02em;pointer-events:none;text-align:center;background:rgba(19,27,46,0.88);padding:20px 28px;border-radius:4px;border:1px solid var(--border)}
[data-theme="light"] #emptyHint{background:rgba(248,250,252,0.92);border-color:var(--border-solid)}
#emptyHint b{color:var(--accentBright)}

/* ===== Properties Panel ===== */
#properties{width:280px;min-width:220px;background:var(--bg2);border-left:1px solid var(--border);overflow-y:auto;display:flex;flex-direction:column}
#properties h3{font-family:"Space Grotesk",sans-serif;font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.12em;color:var(--accentBright);margin:0;padding:0;border-bottom:none;background:none;display:flex;align-items:center;gap:6px;flex-shrink:0}
#properties h3::before{content:'';width:6px;height:6px;border-radius:50%;background:var(--accent);flex-shrink:0}
.hint{color:var(--textDim);font-size:12px;font-style:italic;padding:16px 14px}
#propsContent{padding:12px 14px;flex:1}

/* Properties form */
.prop-group{margin-bottom:10px}
.prop-group label{display:block;font-size:10px;font-weight:700;color:var(--textMuted);margin-bottom:4px;text-transform:uppercase;letter-spacing:.08em;font-family:'Inter',sans-serif}
.prop-group input,.prop-group select{width:100%;background:var(--bg);color:var(--text);border:1px solid var(--border);padding:6px 8px;border-radius:4px;font-size:12px;font-family:'Inter',sans-serif;outline:none;transition:border-color .15s}
.prop-group input[type="number"]{font-family:'JetBrains Mono',monospace;color:var(--accentBright)}
.prop-group input:focus,.prop-group select:focus{border-color:var(--accent);box-shadow:0 0 0 2px rgba(14,165,233,0.12)}
.prop-row{display:flex;gap:6px}
.prop-row .prop-group{flex:1}
.prop-type{font-family:'Space Grotesk',sans-serif;font-size:13px;font-weight:700;color:var(--accentBright);margin-bottom:10px;padding-top:4px}
.prop-section-title{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--textMuted);margin:14px 0 8px;border-top:1px solid var(--border);padding-top:10px;display:flex;align-items:center;gap:6px}
.prop-section-title::before{content:'';width:4px;height:4px;border-radius:50%;background:var(--accent);flex-shrink:0}
.prop-fitting-item{display:flex;align-items:center;gap:6px;padding:4px 6px;background:var(--bg);border-radius:4px;margin-bottom:3px;font-size:11px}
.prop-fitting-item .fit-name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.prop-fitting-item button{background:none;border:none;color:var(--danger);cursor:pointer;font-size:13px;padding:0 2px}
.btn-sm{background:var(--bg);color:var(--text);border:1px solid var(--border);padding:4px 8px;border-radius:4px;cursor:pointer;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.05em}
.btn-sm:hover{border-color:var(--accent);color:var(--accent)}
.prop-loss{font-size:11px;color:var(--success);margin-top:3px}
.prop-loss.warn{color:var(--warn)}

/* ===== SVG Component Styles ===== */
.comp{cursor:pointer;transition:filter .15s}
.comp:hover{filter:brightness(1.2)}
.comp.selected{filter:drop-shadow(0 0 6px rgba(14,165,233,0.7))}
.comp-label{font-size:10px;fill:var(--textDim);pointer-events:none}
.duct-wall{stroke:#475569;stroke-width:1.5;fill:none}
.duct-center{stroke:none;fill:rgba(14,165,233,0.06)}
.fan-body{stroke:#94a3b8;stroke-width:1.5;fill:rgba(14,165,233,0.08)}
.fitting-body{stroke:#64748b;stroke-width:1.5;fill:rgba(14,165,233,0.06)}
.flow-arrow{fill:rgba(14,165,233,0.5);pointer-events:none}
.label-leader{stroke:#334155;stroke-width:.5;stroke-dasharray:2 2;pointer-events:none}
.branch-indicator{fill:var(--accentBright);font-size:9px;cursor:pointer;display:none}
.comp.selected .branch-indicator{display:initial}
.branch-indicator:hover{fill:#fff}
.critical-path .duct-wall,.critical-path .fitting-body{stroke:#ef4444;stroke-width:2}

/* ===== Results ===== */
#results{position:fixed;bottom:0;left:0;right:0;height:40vh;min-height:80px;display:flex;flex-direction:column;overflow:hidden;background:var(--bg2);border-top:2px solid var(--accent);padding:12px 16px;z-index:10}
.results-resize-handle{position:absolute;top:-4px;left:0;right:0;height:8px;cursor:ns-resize;z-index:11}
.results-resize-handle:hover,.results-resize-handle.active{background:rgba(14,165,233,0.2)}
#results h3{font-family:'Space Grotesk',sans-serif;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--accentBright);margin-bottom:8px;flex-shrink:0}
#resultsSummary{margin-bottom:10px;font-size:13px;flex-shrink:0;background:var(--bg2);padding-bottom:8px;border-bottom:1px solid var(--border)}
#resultsSummary .crit{color:var(--danger);font-weight:700;font-size:15px}
#resultsTable{overflow-y:auto;flex:1;min-height:0}
#resultsTable table{width:100%;border-collapse:collapse;font-size:12px;table-layout:fixed}
#resultsTable th{background:var(--bg3);padding:5px 8px;text-align:left;border-bottom:1px solid var(--border);color:var(--textDim);font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;position:sticky;top:0;z-index:1;overflow:hidden}
.col-resize-handle{position:absolute;right:-3px;top:0;bottom:0;width:6px;cursor:col-resize;z-index:5}
.col-resize-handle:hover,.col-resize-handle.active{background:rgba(14,165,233,0.3)}
#resultsTable td{padding:4px 8px;border-bottom:1px solid rgba(30,41,59,0.6)}
#resultsTable tr.critical{background:rgba(239,68,68,0.07)}
#resultsTable .path-header{background:var(--surface);font-weight:600;color:var(--accent)}

/* ===== Inline input overlay ===== */
.inline-input-overlay{position:absolute;z-index:100;background:var(--bg2);border:1px solid var(--border);border-radius:4px;padding:6px 10px;display:flex;gap:6px;align-items:center;font-size:11px;box-shadow:0 4px 16px rgba(0,0,0,0.4);pointer-events:auto}
.inline-input-overlay label{color:var(--textDim);font-size:10px;white-space:nowrap}
.inline-input-overlay input{width:60px;padding:3px 6px;border:1px solid var(--border);border-radius:4px;background:var(--bg);color:var(--accentBright);font-size:12px;font-family:'JetBrains Mono',monospace;text-align:center;outline:none}
.inline-input-overlay input:focus{border-color:var(--accent)}
.inline-input-overlay .hint-text{color:var(--textDim);font-size:10px;margin-left:4px}

/* ===== Velocity / Pressure colors ===== */
.duct-ok .duct-wall{stroke:#22c55e}.duct-ok .duct-center{fill:rgba(34,197,94,0.08)}
.duct-warn .duct-wall{stroke:#eab308}.duct-warn .duct-center{fill:rgba(234,179,8,0.08)}
.duct-danger .duct-wall{stroke:#ef4444}.duct-danger .duct-center{fill:rgba(239,68,68,0.1)}
.duct-stats{font-size:9px;fill:#64748b}
.prop-readonly{display:inline-block;padding:5px 10px;background:var(--bg);border-radius:4px;color:var(--accentBright);font-weight:700;font-family:'JetBrains Mono',monospace;font-size:14px;min-width:60px}
.cfm-input-prominent{font-family:'JetBrains Mono',monospace!important;font-size:14px!important;font-weight:700!important;color:var(--accentBright)!important;padding:6px 10px!important;border:2px solid rgba(14,165,233,0.3)!important;border-radius:4px}
.cfm-input-prominent:focus{border-color:var(--accent)!important}

/* ===== Modal ===== */
.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,0.6);display:flex;align-items:center;justify-content:center;z-index:100}
.modal-card{background:var(--bg2);border-radius:4px;border:1px solid var(--border);width:440px;max-height:80vh;overflow:hidden;box-shadow:0 16px 48px rgba(0,0,0,0.5)}
.modal-header{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-bottom:1px solid var(--border)}
.modal-header h3{font-family:'Space Grotesk',sans-serif;font-size:13px;font-weight:700;color:var(--accentBright)}
.modal-close{background:none;border:none;color:var(--textDim);font-size:16px;cursor:pointer;padding:4px 6px;border-radius:4px}
.modal-close:hover{color:var(--text);background:var(--panel-accent)}
.modal-body{padding:16px;overflow-y:auto;max-height:calc(80vh - 50px)}
.modal-form label{display:block;color:var(--textMuted);font-size:10px;font-weight:700;margin-bottom:4px;text-transform:uppercase;letter-spacing:.06em}

/* ===== Project list ===== */
.project-list{display:flex;flex-direction:column;gap:4px;max-height:300px;overflow-y:auto;margin-bottom:8px}
.project-item{display:flex;align-items:center;justify-content:space-between;padding:8px 10px;background:var(--bg);border:1px solid var(--border);border-radius:4px;transition:border-color .15s}
.project-item:hover{border-color:rgba(14,165,233,0.3)}
.project-info{display:flex;flex-direction:column;gap:2px}
.project-name{font-size:13px;color:var(--text);font-weight:500}
.project-date{font-size:10px;color:var(--textDim)}
.project-actions{display:flex;gap:4px}
.project-actions button{background:none;border:1px solid var(--border);border-radius:4px;padding:3px 7px;cursor:pointer;font-size:13px;color:var(--text)}
.project-actions button:hover{border-color:rgba(14,165,233,0.3);color:var(--accent)}
.btn-delete-project:hover{border-color:rgba(239,68,68,0.3)!important;background:rgba(239,68,68,0.08)!important}

/* ===== Auth ===== */
.auth-error{background:rgba(239,68,68,0.1);color:#fca5a5;padding:8px 12px;border-radius:4px;font-size:12px;border:1px solid rgba(239,68,68,0.2)}

/* ===== Path highlight ===== */
.path-highlight .duct-wall,.path-highlight .fitting-body,.path-highlight .fan-body{stroke:var(--accent)!important;stroke-width:2.5}
.path-highlight .duct-center,.path-highlight .fitting-body{fill:rgba(14,165,233,0.1)!important}
.path-header[data-path-index]{cursor:pointer}
.path-header[data-path-index]:hover{background:rgba(14,165,233,0.12)!important}
.path-active{background:rgba(14,165,233,0.08)!important}
.row-active{background:rgba(14,165,233,0.12)!important}
.duct-row:hover,.fitting-row:hover{background:rgba(14,165,233,0.06)!important}
.size-edit{width:48px;background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:4px;padding:2px 4px;font-size:11px;font-family:'JetBrains Mono',monospace;text-align:center}
.size-edit:focus{outline:none;border-color:var(--accent)}

/* ===== Validation warnings ===== */
.prop-warning{padding:5px 8px;border-radius:4px;font-size:11px;margin-top:3px;margin-bottom:3px}
.prop-warning.error{background:rgba(239,68,68,0.1);color:#fca5a5;border:1px solid rgba(239,68,68,0.2)}
.prop-warning.warn{background:rgba(245,158,11,0.1);color:#fcd34d;border:1px solid rgba(245,158,11,0.2)}
.prop-warning.info{background:rgba(14,165,233,0.08);color:#7dd3fc;border:1px solid rgba(14,165,233,0.15)}

/* ===== Tee warnings ===== */
.tee-warning{font-size:14px;font-weight:bold;pointer-events:none;fill:#f59e0b}
.tee-error{font-size:14px;font-weight:bold;pointer-events:none;fill:#ef4444}
@keyframes pulse-warn{0%,100%{opacity:1}50%{opacity:.4}}
.tee-warning{animation:pulse-warn 2s ease-in-out infinite}

/* ===== Calc warnings ===== */
.calc-warnings{margin:6px 0}
.calc-warning{padding:4px 8px;background:rgba(245,158,11,0.08);color:#fcd34d;font-size:12px;border-left:3px solid #f59e0b;margin-bottom:3px}

/* ===== Toggle pills (outside toolbar) ===== */
.toggle-pill{background:var(--bg2);color:var(--text);border:1px solid var(--border);padding:4px 10px;border-radius:12px;cursor:pointer;font-size:11px;white-space:nowrap;transition:all .15s;min-height:28px;line-height:1;display:inline-flex;align-items:center;gap:4px}
.toggle-pill.active{border-color:var(--accent);background:rgba(14,165,233,0.12);color:var(--accentBright)}
.toggle-pill:hover{border-color:rgba(14,165,233,0.3);color:var(--accentBright)}
.toggle-pill.active:hover{color:var(--accentBright)}

/* ===== Label hide classes ===== */
#diagram.hide-names .label-name{display:none}
#diagram.hide-cfm .label-cfm{display:none}
#diagram.hide-velocity .label-velocity{display:none}
#diagram.hide-pressure .label-pressure{display:none}
#diagram.hide-length .label-length{display:none}

/* ===== Color settings modal ===== */
.color-preset-group{margin-bottom:14px;padding-bottom:10px;border-bottom:1px solid var(--border)}
.color-preset-group:last-of-type{border-bottom:none}
.color-preset-group h4{font-size:12px;color:var(--accentBright);margin-bottom:8px;font-family:'Space Grotesk',sans-serif;font-weight:700}

/* ===== Active port ===== */
.branch-indicator.active-port{fill:#fff;font-size:12px;font-weight:bold;filter:drop-shadow(0 0 4px rgba(14,165,233,0.7))}

/* ===== Flip button ===== */
.btn-flip{display:block;width:100%;margin-top:6px;padding:6px 10px;background:var(--panel-accent);color:var(--text);border:1px solid var(--border);border-radius:4px;cursor:pointer;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;text-align:center}
.btn-flip:hover{background:rgba(14,165,233,0.1);border-color:rgba(14,165,233,0.3)}

/* ===== Fitting rows ===== */
.fitting-row td{font-size:11px;color:var(--textDim)}
.fitting-row .indent{padding-left:24px}
.zoom-hint{position:absolute;bottom:8px;left:8px;font-size:10px;color:var(--textMuted);pointer-events:none}

/* ===== Toast ===== */
.toast-container{position:absolute;top:8px;right:8px;z-index:200;display:flex;flex-direction:column;gap:6px;pointer-events:none}
.toast{background:var(--bg2);border:1px solid var(--border);border-radius:4px;padding:8px 14px;color:var(--text);font-size:12px;box-shadow:0 4px 16px rgba(0,0,0,0.4);pointer-events:auto;animation:toastIn .3s ease-out;max-width:320px;line-height:1.4}
.toast.warn{border-left:3px solid #f59e0b}
.toast.error{border-left:3px solid #ef4444}
.toast.info{border-left:3px solid var(--accent)}
.toast.fade-out{animation:toastOut .5s ease-in forwards}
@keyframes toastIn{from{opacity:0;transform:translateX(40px)}to{opacity:1;transform:translateX(0)}}
@keyframes toastOut{from{opacity:1;transform:translateX(0)}to{opacity:0;transform:translateX(40px)}}

/* ===== Secondary button ===== */
.btn-secondary{background:var(--bg);border:1px solid var(--border);color:var(--text);padding:5px 14px;border-radius:4px;cursor:pointer;font-size:12px;font-weight:600}
.btn-secondary:hover{background:var(--bg2);border-color:rgba(14,165,233,0.3)}

/* ===== Lucide + SVG icons ===== */
.lucide{width:16px;height:16px;vertical-align:middle;display:inline-block;stroke-width:2}
.icon-svg{width:16px;height:16px;vertical-align:middle;display:inline-block}
#header .header-controls button{display:inline-flex;align-items:center;gap:4px}
.project-actions button .lucide{width:14px;height:14px}
input.no-spin::-webkit-outer-spin-button,input.no-spin::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
input.no-spin[type=number]{-moz-appearance:textfield}
input::-webkit-outer-spin-button,input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}
input[type=number]{-moz-appearance:textfield}

/* ===== Calc ref values ===== */
.prop-calc-ref{margin-top:8px;padding-top:8px;border-top:1px solid var(--border)}
.prop-calc-ref .prop-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:4px}
.prop-calc-ref label{font-size:10px;color:var(--textMuted);text-transform:uppercase;letter-spacing:.06em}
.prop-calc-ref .prop-readonly{font-size:12px;padding:3px 8px}

/* ===== CFM inherited/set ===== */
input.cfm-inherited{color:var(--textDim);font-style:italic}
input.cfm-inherited::placeholder{color:var(--textDim);opacity:.6;font-style:italic}
input.cfm-set{color:var(--accentBright);font-weight:600}

/* ===== Safety factor ===== */
.safety-factor-section{margin-top:10px;padding:10px;background:var(--bg);border:1px solid var(--border);border-radius:4px}
.safety-factor-section input[type="number"]{width:70px;padding:4px 8px;border:1px solid var(--border);border-radius:4px;background:var(--bg2);color:var(--accentBright);font-family:'JetBrains Mono',monospace;font-size:12px;outline:none}
.safety-factor-section input[type="number"]:focus{border-color:var(--accent)}

/* ===== Account tabs ===== */
.account-tab{padding:10px 14px;background:none;border:none;color:var(--textDim);cursor:pointer;font-size:13px;border-bottom:2px solid transparent;transition:all .2s}
.account-tab:hover{color:var(--text)}
.account-tab.active{color:var(--text);border-bottom-color:var(--accent)}

/* ===== Light mode overrides ===== */
[data-theme="light"] .duct-wall{stroke:#475569}
[data-theme="light"] .duct-center{fill:rgba(14,165,233,0.05)}
[data-theme="light"] .fan-body{stroke:#475569;fill:rgba(14,165,233,0.08)}
[data-theme="light"] .fitting-body{stroke:#64748b;fill:rgba(14,165,233,0.06)}
[data-theme="light"] .flow-arrow{fill:rgba(14,165,233,0.4)}
[data-theme="light"] .duct-stats{fill:#64748b}
[data-theme="light"] .label-leader{stroke:#94a3b8}
[data-theme="light"] .branch-indicator{fill:var(--accent)}
[data-theme="light"] .btn-flip{background:var(--bg3);color:var(--text)}
[data-theme="light"] .btn-flip:hover{background:var(--border-solid)}
[data-theme="light"] .auth-error{background:rgba(220,38,38,0.08);color:#b91c1c;border:1px solid rgba(220,38,38,0.2)}
[data-theme="light"] .prop-warning.error{background:rgba(220,38,38,0.08);color:#b91c1c;border-color:rgba(220,38,38,0.2)}
[data-theme="light"] .prop-warning.warn{background:rgba(217,119,6,0.08);color:#92400e;border-color:rgba(217,119,6,0.2)}
[data-theme="light"] .prop-warning.info{background:rgba(14,165,233,0.08);color:#0369a1;border-color:rgba(14,165,233,0.2)}
[data-theme="light"] #resultsTable td{border-bottom:1px solid #e2e8f0}
[data-theme="light"] .path-highlight .duct-wall,
[data-theme="light"] .path-highlight .fitting-body,
[data-theme="light"] .path-highlight .fan-body{stroke:var(--accent)!important;stroke-width:2.5}
[data-theme="light"] .path-active{background:rgba(2,132,199,0.08)!important}
[data-theme="light"] .row-active{background:rgba(2,132,199,0.12)!important}
[data-theme="light"] .duct-row:hover,[data-theme="light"] .fitting-row:hover{background:rgba(2,132,199,0.05)!important}
[data-theme="light"] .toast{box-shadow:0 4px 16px rgba(0,0,0,0.1)}
[data-theme="light"] .duct-ok .duct-wall{stroke:#15803d}
[data-theme="light"] .duct-ok .duct-center{fill:rgba(21,128,61,0.07)}
[data-theme="light"] .duct-warn .duct-wall{stroke:#a16207}
[data-theme="light"] .duct-warn .duct-center{fill:rgba(161,98,7,0.07)}
[data-theme="light"] .duct-danger .duct-wall{stroke:#b91c1c}
[data-theme="light"] .duct-danger .duct-center{fill:rgba(185,28,28,0.08)}
[data-theme="light"] .safety-factor-section{background:#f8fafc}
[data-theme="light"] .safety-factor-section input[type="number"]{background:white}
[data-theme="light"] .account-tab{color:#64748b}
[data-theme="light"] .account-tab:hover,[data-theme="light"] .account-tab.active{color:#0f172a}


/* ===== Visibility settings group ===== */
#visibilityGroup{flex-direction:column;align-items:center;gap:2px;width:100%;padding:0}
#toolbar.expanded #visibilityGroup{align-items:stretch}
/* ===== Print ===== */
@media print{
  *{-webkit-print-color-adjust:exact!important;print-color-adjust:exact!important}
  #header,#toolbar,#properties,.zoom-hint,.results-resize-handle,#emptyHint,#projectModal,.toast,#siteFooter{display:none!important}
  .print-footer{display:block!important;text-align:center;padding:12px 0;border-top:1px solid #ccc;margin-top:16px;font-size:10px;color:#666}
  html,body{height:auto!important;overflow:visible!important;background:#fff!important;color:#000!important}
  #main{display:block!important;height:auto!important;overflow:visible!important}
  #canvas-wrap{overflow:visible!important;width:100%!important;height:auto!important;background:#fff!important;background-image:none!important;box-shadow:none!important}
  #diagram{width:100%!important;height:auto!important;background:#fff!important}
  #diagram rect[fill="url(#grid)"]{fill:none!important}
  .duct-wall{stroke:#333!important}
  .duct-center{fill:rgba(200,200,200,.15)!important}
  .fitting-body{fill:rgba(200,200,200,.15)!important;stroke:#333!important}
  .fan-body{fill:rgba(200,200,200,.2)!important;stroke:#333!important}
  .comp-label,.duct-stats{fill:#000!important}
  .label-leader{stroke:#999!important}
  .flow-arrow{fill:rgba(0,0,0,.3)!important}
  .branch-indicator{fill:#333!important}
  .duct-ok .duct-wall{stroke:#22aa66!important}.duct-ok .duct-center{fill:rgba(34,170,102,.1)!important}
  .duct-warn .duct-wall{stroke:#aa8800!important}.duct-warn .duct-center{fill:rgba(170,136,0,.1)!important}
  .duct-danger .duct-wall{stroke:#cc0000!important}.duct-danger .duct-center{fill:rgba(204,0,0,.1)!important}
  #results{position:relative!important;display:block!important;height:auto!important;min-height:0!important;background:#fff!important;border-top:2px solid #333!important;padding:12px 0!important;page-break-before:always;overflow:visible!important}
  #results h3{color:#000!important}
  #results h3 button{display:none!important}
  #resultsSummary{color:#000!important;background:#fff!important;border-bottom:1px solid #ccc!important}
  #resultsSummary .crit{color:#cc0000!important}
  #resultsTable{overflow:visible!important;height:auto!important;max-height:none!important}
  #resultsTable table{font-size:10px!important}
  #resultsTable th{background:#eee!important;color:#333!important;border-bottom:1px solid #999!important}
  #resultsTable td{border-bottom:1px solid #ddd!important;color:#000!important}
  #resultsTable tr.critical{background:rgba(204,0,0,.05)!important}
  #resultsTable .path-header{background:#e8e8e8!important;color:#000!important}
  .fitting-row td{color:#555!important}
  .size-edit{border:none!important;background:transparent!important;color:#000!important;padding:0!important}
  .col-resize-handle{display:none!important}
  .calc-warnings{color:#885500!important}
  .calc-warning{background:rgba(136,85,0,.05)!important;color:#885500!important;border-left-color:#885500!important}
  .print-header{display:block!important;text-align:center;padding:20px 0 10px;border-bottom:2px solid #000;margin-bottom:20px}
  .print-header h1{font-size:18px;color:#000;margin:0}
  .print-header .print-meta{font-size:11px;color:#555;margin-top:4px}
  .safety-factor-section{background:#f5f5f5!important;border:1px solid #ccc!important;padding:10px!important;margin-top:10px!important;page-break-inside:avoid}
  .safety-factor-section input[type="number"]{border:1px solid #999!important;background:white!important;color:#000!important}
  .safety-factor-section label,.safety-factor-section div{color:#000!important}
}
.print-header{display:none}

/* ── Results compact summary bar ───────────────────── */
.results-summary-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: var(--cardBg);
    border-bottom: 1px solid var(--border);
    flex-wrap: wrap;
    font-size: 13px;
    flex-shrink: 0;
}
.rsb-label {
    color: var(--textDim);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: .04em;
    margin-right: 2px;
}
.rsb-sep {
    color: var(--textDim);
    font-size: 12px;
    padding: 0 2px;
}
.rsb-raw b, .rsb-adj b { font-size: 15px; }
.rsb-adj { color: var(--accent, #7bd0ff); }
.rsb-sf input[type="number"] {
    width: 46px;
    padding: 2px 5px;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--inputBg);
    color: var(--text);
    font-size: 13px;
    text-align: center;
}
.rsb-pct { color: var(--textDim); }
.rsb-paths { margin-left: auto; }

/* ── Results tab bar ─────────────────────────────────── */
.results-tab-bar {
    display: flex;
    gap: 4px;
    padding: 8px 12px 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 0;
    flex-shrink: 0;
}
.results-tab {
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--textDim);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    padding: 6px 14px;
    transition: color 0.15s, border-color 0.15s;
    border-radius: 4px 4px 0 0;
}
.results-tab:hover { color: var(--text); }
.results-tab.active {
    color: var(--accent, #7bd0ff);
    border-bottom-color: var(--accent, #7bd0ff);
}
.results-tab-content { display: none; overflow: auto; flex: 1; }
.results-tab-content.active { display: block; }

/* Pressure profile chart container */
#pressureProfileWrap {
    padding: 12px 16px 16px;
    height: 100%;
    min-height: 200px;
    box-sizing: border-box;
    position: relative;
}
#pressureProfileChart {
    width: 100% !important;
    display: block;
}
.print-footer{display:none}

/* ===== Footer ===== */
#siteFooter{background:var(--bg3);border-top:1px solid var(--border);padding:0 20px;height:38px;display:flex;align-items:center;justify-content:space-between;flex-shrink:0;z-index:30}
.footer-disclaimer{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--textDim)}
.footer-links{display:flex;align-items:center;gap:12px}
.footer-link{color:var(--textDim);text-decoration:none;font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;transition:color .15s}
.footer-link:hover{color:var(--accentBright)}
.footer-sep{color:var(--border-solid);font-size:10px}
.footer-right{display:flex;align-items:center;gap:12px}
.footer-coffee{display:inline-flex;align-items:center;gap:5px;background:#FFDD00;color:#000;padding:3px 10px;border-radius:4px;text-decoration:none;font-size:10px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;transition:opacity .15s}
.footer-coffee:hover{opacity:.8}
.footer-visits{color:var(--textDim);font-size:10px;font-family:'JetBrains Mono',monospace}
.footer-version{color:var(--textDim);font-size:10px;font-family:'JetBrains Mono',monospace}