/* ============================================================================
 * Noritz Commercial Sizing Calculator — Algorithm Designer
 * ----------------------------------------------------------------------------
 * Internal engineering tool. Same two-column dashboard language as Concept 2
 * "Engineer's Console" (dark sticky control panel + white readout), extended
 * with a live-editable ffu2gpm() sandbox and a saved-test comparison log.
 * Every rule is scoped under #csca-root.
 * ========================================================================== */

#csca-root{
  --red:#D2332A;--red-hover:#C92731;--red-active:#A81E26;--brand-red:#EF3340;
  --ink:#231F20;--ink2:#3D3D3D;--muted:#686868;--muted2:#888888;
  --border:#E5E5E5;--border2:#C7C7C7;--surface:#FFFFFF;--surface2:#FAFAFA;--surface3:#F4F4F4;
  --dark:#0F0E0E;--ok:#239C56;--warn:#B8860B;
  --dpanel:#231F20;--dborder:#2E2E2E;--dtext:rgba(255,255,255,.75);
  font-family:'Roboto',system-ui,-apple-system,sans-serif;
  color:var(--ink);line-height:1.5;box-sizing:border-box;
  display:block;width:100%;
}
#csca-root *,#csca-root *::before,#csca-root *::after{box-sizing:border-box;}
#csca-root .num{font-variant-numeric:tabular-nums;font-feature-settings:"tnum";}

/* ---- layout ------------------------------------------------------------- */
#csca-root .csca-shell{
  display:grid;grid-template-columns:360px minmax(0,1fr);gap:28px;
  align-items:stretch;max-width:1320px;margin:0 auto;padding:8px 0;
}

/* ================= LEFT: dark control panel ============================== */
#csca-root .csca-panel{
  position:sticky;top:20px;background:var(--dpanel);color:#fff;
  border-radius:14px;padding:22px 20px 24px;
  box-shadow:0 12px 40px rgba(15,14,14,.28);
}
#csca-root .csca-panel-head{display:flex;align-items:center;gap:10px;margin:0 0 4px;}
#csca-root .csca-panel-head .dot{
  width:9px;height:9px;border-radius:50%;background:var(--brand-red);
  box-shadow:0 0 0 4px rgba(239,51,64,.18);flex:none;
}
#csca-root .csca-panel h2{
  font-family:'Titillium Web',sans-serif;font-weight:700;font-size:16px;
  letter-spacing:.02em;margin:0;color:#fff;text-transform:uppercase;
}
#csca-root .csca-panel .csca-sub{color:var(--dtext);font-size:12px;margin:2px 0 18px;}

#csca-root .csca-seclabel{
  font-family:'Titillium Web',sans-serif;font-weight:700;font-size:11px;
  letter-spacing:.14em;text-transform:uppercase;color:var(--brand-red);
  margin:20px 0 10px;display:flex;align-items:center;gap:8px;
}
#csca-root .csca-seclabel::after{content:"";height:1px;flex:1;background:var(--dborder);}
#csca-root .csca-seclabel:first-of-type{margin-top:6px;}

#csca-root .csca-field{margin-bottom:12px;}
#csca-root .csca-field > label{
  display:block;font-size:11px;font-weight:600;letter-spacing:.05em;
  text-transform:uppercase;color:var(--dtext);margin-bottom:6px;
}
#csca-root .csca-field.two{display:grid;grid-template-columns:1fr 100px;gap:8px;align-items:end;}
#csca-root .csca-field.two[hidden]{display:none;}

#csca-root select,
#csca-root input[type=text],
#csca-root input[type=number]{
  width:100%;font-family:inherit;font-size:14px;color:#fff;
  background:#1A1718;border:1px solid var(--dborder);border-radius:8px;
  padding:9px 11px;-webkit-appearance:none;appearance:none;
}
#csca-root select{
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'><path fill='%23888888' d='M6 8 0 0h12z'/></svg>");
  background-repeat:no-repeat;background-position:right 11px center;padding-right:30px;cursor:pointer;
}
#csca-root select:focus,
#csca-root input:focus{outline:none;border-color:var(--red);box-shadow:0 0 0 3px rgba(210,51,42,.28);}
#csca-root input::placeholder{color:var(--muted2);}
#csca-root option{color:#111;}

/* segmented control */
#csca-root .csca-seg{display:flex;background:#1A1718;border:1px solid var(--dborder);border-radius:8px;padding:3px;gap:3px;}
#csca-root .csca-seg button{
  flex:1;font-family:inherit;font-size:12px;font-weight:600;color:var(--dtext);
  background:transparent;border:none;border-radius:6px;padding:7px 4px;cursor:pointer;
  letter-spacing:.01em;transition:background .12s,color .12s;
}
#csca-root .csca-seg button:hover{color:#fff;}
#csca-root .csca-seg button.is-active{background:var(--red);color:#fff;}

/* temp steppers */
#csca-root .csca-stepper{display:flex;align-items:center;background:#1A1718;border:1px solid var(--dborder);border-radius:8px;overflow:hidden;}
#csca-root .csca-stepper button{width:34px;flex:none;background:transparent;border:none;color:#fff;font-size:18px;line-height:1;cursor:pointer;padding:9px 0;font-weight:700;}
#csca-root .csca-stepper button:hover{background:#2A2626;}
#csca-root .csca-stepper input{border:none;border-radius:0;text-align:center;padding:9px 2px;background:transparent;box-shadow:none;}
#csca-root .csca-stepper input:focus{box-shadow:none;}
#csca-root .csca-unit{font-size:11px;color:var(--muted2);padding:0 10px;flex:none;}

/* fixtures list (in left panel) */
#csca-root .csca-fixtures{margin-top:4px;}
#csca-root .csca-fix-row{display:grid;grid-template-columns:1fr 66px;gap:8px;align-items:center;padding:6px 0;border-bottom:1px solid var(--dborder);}
#csca-root .csca-fix-row:last-child{border-bottom:none;}
#csca-root .csca-fix-name{font-size:12.5px;color:#fff;}
#csca-root .csca-fix-hwfu{font-size:10.5px;color:var(--muted2);}
#csca-root .csca-fix-row input{padding:6px 8px;font-size:13px;text-align:center;}

/* status lines inside panel */
#csca-root .csca-status{font-size:12px;color:var(--dtext);padding:12px 12px;border:1px dashed var(--dborder);border-radius:8px;display:flex;align-items:center;gap:9px;}
#csca-root .csca-status.err{color:#FF9A93;border-color:#5A2A2A;background:rgba(210,51,42,.08);border-style:solid;}
#csca-root .csca-spin{width:14px;height:14px;border-radius:50%;border:2px solid var(--dborder);border-top-color:var(--brand-red);animation:csca-spin .7s linear infinite;flex:none;}
@keyframes csca-spin{to{transform:rotate(360deg);}}

/* calculate button */
#csca-root .csca-calc{
  width:100%;margin-top:20px;font-family:'Titillium Web',sans-serif;font-weight:700;
  font-size:16px;letter-spacing:.02em;color:#fff;background:var(--red);border:none;
  border-radius:17px;padding:14px 20px;cursor:pointer;
  box-shadow:0 6px 18px rgba(210,51,42,.34);transition:background .12s,transform .05s;
}
#csca-root .csca-calc:hover:not(:disabled){background:var(--red-hover);}
#csca-root .csca-calc:active:not(:disabled){background:var(--red-active);transform:translateY(1px);}
#csca-root .csca-calc:disabled{opacity:.45;cursor:not-allowed;box-shadow:none;}

/* ================= RIGHT: white readout column ============================ */
#csca-root .csca-readout{min-width:0;display:flex;flex-direction:column;gap:22px;}

#csca-root .csca-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;overflow:hidden;}
#csca-root .csca-card-head{background:var(--ink);color:#fff;padding:16px 22px;display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;}
#csca-root .csca-card-head h3{font-family:'Titillium Web',sans-serif;font-weight:700;font-size:18px;margin:0;letter-spacing:.01em;}
#csca-root .csca-card-head .tag{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:rgba(255,255,255,.55);}
#csca-root .csca-card-body{padding:20px 22px;}

/* ---- saved-tests log header actions (export/import) ---------------------- */
#csca-root .csca-log-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap;}
#csca-root .csca-mini-btn{
  font-family:'Titillium Web',sans-serif;font-weight:700;font-size:11.5px;letter-spacing:.02em;
  color:rgba(255,255,255,.85);background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.22);
  border-radius:14px;padding:6px 14px;cursor:pointer;transition:background .12s;
}
#csca-root .csca-mini-btn:hover{background:rgba(255,255,255,.22);color:#fff;}
#csca-root .csca-import-msg{font-size:12.5px;margin-bottom:0;display:none;}
#csca-root .csca-import-msg.is-visible{display:block;margin-bottom:14px;}
#csca-root .csca-import-msg.ok{color:var(--ok);}
#csca-root .csca-import-msg.err{color:var(--red);}

/* ---- algorithm editor ---------------------------------------------------- */
#csca-root .csca-editor-note{font-size:13px;color:var(--muted);margin:0 0 14px;line-height:1.6;}
#csca-root .csca-editor-note code{background:var(--surface3);border-radius:4px;padding:1px 5px;font-size:12.5px;}
#csca-root textarea.csca-code{
  width:100%;min-height:320px;resize:vertical;-webkit-appearance:none;appearance:none;
  font-family:'SF Mono',Consolas,'Liberation Mono',Menlo,monospace;
  font-size:13px;line-height:1.7;color:var(--ink);background:var(--surface2);
  border:1.5px solid var(--border2);border-radius:10px;padding:16px;tab-size:2;caret-color:var(--red);
}
#csca-root textarea.csca-code:focus{outline:none;border-color:var(--red);box-shadow:0 0 0 3px rgba(210,51,42,.16);background:var(--surface);}
#csca-root .csca-editor-actions{display:flex;gap:10px;margin-top:14px;flex-wrap:wrap;align-items:center;}
#csca-root .csca-btn{
  font-family:'Titillium Web',sans-serif;font-weight:700;font-size:13.5px;
  border-radius:17px;padding:10px 22px;cursor:pointer;border:none;transition:background .12s;
}
#csca-root .csca-btn.primary{background:var(--red);color:#fff;box-shadow:0 4px 12px rgba(210,51,42,.28);}
#csca-root .csca-btn.primary:hover{background:var(--red-hover);}
#csca-root .csca-btn.ghost{background:var(--surface3);color:var(--ink);}
#csca-root .csca-btn.ghost:hover{background:var(--border2);}
#csca-root .csca-btn:disabled{opacity:.45;cursor:not-allowed;}
#csca-root .csca-applied-tag{font-size:12px;color:var(--ok);font-weight:600;}
#csca-root .csca-editor-err{margin-top:12px;background:#FDE6E7;color:var(--red-active);border-radius:8px;padding:10px 14px;font-size:13px;font-family:monospace;display:none;}
#csca-root .csca-editor-err.is-visible{display:block;}

/* ---- local readout (custom formula output) ------------------------------ */
#csca-root .csca-local-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-bottom:16px;}
#csca-root .csca-metric{background:var(--surface2);border:1px solid var(--border);border-radius:10px;padding:14px 15px;}
#csca-root .csca-metric.accent{background:var(--ink);border-color:var(--ink);}
#csca-root .csca-metric .k{font-size:10.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:6px;}
#csca-root .csca-metric.accent .k{color:rgba(255,255,255,.6);}
#csca-root .csca-metric .v{font-family:'Titillium Web',sans-serif;font-weight:700;font-size:26px;line-height:1;color:var(--ink);letter-spacing:-.01em;}
#csca-root .csca-metric.accent .v{color:#fff;}
#csca-root .csca-metric .u{font-size:12px;color:var(--muted2);font-weight:600;margin-left:3px;}
#csca-root .csca-metric.accent .u{color:rgba(255,255,255,.55);}
#csca-root .csca-metric .v.placeholder{font-size:14px;color:var(--muted2);font-weight:600;font-family:'Roboto',sans-serif;}
#csca-root .csca-metric .v.err{font-size:12px;color:var(--red);font-weight:600;font-family:monospace;}

#csca-root pre.csca-counts{
  background:var(--surface3);border:1px solid var(--border);border-radius:8px;
  padding:12px 14px;font-size:12px;font-family:'SF Mono',Consolas,monospace;color:var(--ink2);
  overflow-x:auto;margin:0;
}

/* ---- live server metrics -------------------------------------------------- */
#csca-root .csca-live-tag{font-family:'Titillium Web',sans-serif;font-weight:700;font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);display:flex;align-items:center;gap:8px;margin-bottom:16px;}
#csca-root .csca-live-tag .pulse{width:8px;height:8px;border-radius:50%;background:var(--ok);animation:csca-pulse 1.6s ease-in-out infinite;}
@keyframes csca-pulse{0%,100%{opacity:.35;}50%{opacity:1;}}
#csca-root .csca-metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;}

/* results wrap */
#csca-root .csca-results[hidden]{display:none;}
#csca-root .csca-specgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--border);border-radius:10px;overflow:hidden;margin-bottom:18px;}
#csca-root .csca-specgrid .cell{padding:12px 15px;border-right:1px solid var(--border);}
#csca-root .csca-specgrid .cell:last-child{border-right:none;}
#csca-root .csca-specgrid .cell .k{font-size:10.5px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-bottom:5px;}
#csca-root .csca-specgrid .cell .v{font-family:'Titillium Web',sans-serif;font-weight:700;font-size:20px;color:var(--ink);}

#csca-root table.csca-tbl{width:100%;border-collapse:collapse;font-size:13.5px;}
#csca-root table.csca-tbl th{text-align:left;font-size:10.5px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);padding:8px 12px;border-bottom:2px solid var(--border2);}
#csca-root table.csca-tbl td{padding:9px 12px;border-bottom:1px solid var(--border);color:var(--ink2);}
#csca-root table.csca-tbl th.r,#csca-root table.csca-tbl td.r{text-align:right;}
#csca-root table.csca-tbl tfoot td{font-family:'Titillium Web',sans-serif;font-weight:700;font-size:15px;color:var(--ink);border-top:2px solid var(--ink);border-bottom:none;background:var(--surface2);}
#csca-root table.csca-tbl tfoot td.peak{color:var(--red);}
#csca-root table.csca-tbl tfoot td.custom{color:var(--warn);}

#csca-root .csca-recs-tag{font-family:'Titillium Web',sans-serif;font-weight:700;font-size:14px;letter-spacing:.02em;text-transform:uppercase;color:var(--ink);margin:0 0 14px;}
#csca-root .csca-cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(0,1fr));gap:18px;}
#csca-root .csca-col{border:1px solid var(--border);border-radius:12px;overflow:hidden;background:var(--surface);display:flex;flex-direction:column;}
#csca-root .csca-col.tier-2{border-color:var(--red);box-shadow:0 8px 24px rgba(210,51,42,.14);}
#csca-root .csca-col-head{padding:12px 16px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;background:var(--surface2);}
#csca-root .csca-badge{font-family:'Titillium Web',sans-serif;font-weight:700;font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:#fff;background:var(--muted);border-radius:17px;padding:4px 12px;}
#csca-root .csca-badge.t0{background:var(--muted);}
#csca-root .csca-badge.t1{background:var(--ink);}
#csca-root .csca-badge.t2{background:var(--red);}
#csca-root .csca-col-qty{font-size:11px;color:var(--muted);font-weight:600;}
#csca-root .csca-col-img{height:130px;display:flex;align-items:center;justify-content:center;padding:14px;background:var(--surface);border-bottom:1px solid var(--border);}
#csca-root .csca-col-img img{max-height:100%;max-width:100%;object-fit:contain;}
#csca-root .csca-col-img .noimg{font-size:12px;color:var(--muted2);}
#csca-root .csca-col-model{padding:14px 16px 6px;}
#csca-root .csca-col-model .name{font-family:'Titillium Web',sans-serif;font-weight:700;font-size:20px;color:var(--red);line-height:1.1;}
#csca-root .csca-col-model .sub{font-size:11.5px;color:var(--muted);margin-top:3px;word-break:break-word;}
#csca-root .csca-col-spec{width:100%;border-collapse:collapse;font-size:12.5px;}
#csca-root .csca-col-spec tr{border-bottom:1px solid var(--border);}
#csca-root .csca-col-spec tr:last-child{border-bottom:none;}
#csca-root .csca-col-spec th{text-align:left;font-weight:600;color:var(--muted);padding:8px 16px;font-size:11px;white-space:nowrap;vertical-align:top;}
#csca-root .csca-col-spec td{text-align:right;padding:8px 16px;color:var(--ink);font-weight:600;vertical-align:top;}

#csca-root .csca-inline-err{background:#FDE6E7;color:var(--red-active);border-radius:8px;padding:12px 14px;font-size:14px;}
#csca-root .csca-empty{color:var(--muted);font-size:14px;padding:22px 4px;text-align:center;}

/* ---- save test panel ------------------------------------------------------ */
#csca-root .csca-save-grid{display:grid;grid-template-columns:1fr 200px;gap:16px;align-items:end;margin-bottom:14px;}
#csca-root .csca-save-grid label{display:block;font-size:11px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-bottom:7px;}
#csca-root .csca-save-grid input[type=text]{
  width:100%;font-family:inherit;font-size:14px;color:var(--ink);background:#fff;
  border:1.5px solid var(--border2);border-radius:8px;padding:10px 12px;
}
#csca-root .csca-save-grid input[type=text]:focus{outline:none;border-color:var(--red);box-shadow:0 0 0 3px rgba(210,51,42,.16);}
#csca-root .csca-btn.primary[data-save-test]{display:inline-flex;align-items:center;gap:9px;}
#csca-root .csca-kbd{
  font-family:'SF Mono',Consolas,'Liberation Mono',Menlo,monospace;font-size:11px;font-weight:600;
  background:rgba(255,255,255,.24);border-radius:5px;padding:2px 7px;letter-spacing:.02em;
}
#csca-root .csca-thumbs{display:flex;gap:8px;}
#csca-root .csca-thumb{
  flex:1;font-size:20px;padding:9px 0;border-radius:8px;border:1.5px solid var(--border2);
  background:#fff;cursor:pointer;color:var(--muted);
}
#csca-root .csca-thumb.is-active[data-thumb="up"]{background:#E0F1E7;border-color:var(--ok);color:var(--ok);}
#csca-root .csca-thumb.is-active[data-thumb="down"]{background:#FDE6E7;border-color:var(--red);color:var(--red);}
#csca-root textarea.csca-notes{
  width:100%;font-family:inherit;font-size:14px;color:var(--ink);background:#fff;
  border:1.5px solid var(--border2);border-radius:8px;padding:10px 12px;min-height:70px;resize:vertical;margin-bottom:14px;
}
#csca-root textarea.csca-notes:focus{outline:none;border-color:var(--red);box-shadow:0 0 0 3px rgba(210,51,42,.16);}
#csca-root .csca-save-msg{font-size:12.5px;color:var(--ok);margin-left:12px;}

/* ---- saved tests log ------------------------------------------------------ */
#csca-root .csca-tests{display:flex;flex-direction:column;gap:10px;}
#csca-root .csca-test-row{border:1px solid var(--border);border-radius:10px;overflow:hidden;}
#csca-root .csca-test-summary{
  display:grid;grid-template-columns:1fr 100px 100px 80px 90px 32px;gap:10px;align-items:center;
  padding:12px 14px;cursor:pointer;background:var(--surface);
}
#csca-root .csca-test-summary:hover{background:var(--surface2);}
#csca-root .csca-test-name{font-weight:600;font-size:13.5px;color:var(--ink);}
#csca-root .csca-test-date{font-size:11px;color:var(--muted);}
#csca-root .csca-test-gpm{font-size:13px;text-align:right;}
#csca-root .csca-test-gpm .lbl{display:block;font-size:9.5px;text-transform:uppercase;color:var(--muted);letter-spacing:.06em;}
#csca-root .csca-test-delta{font-size:13px;font-weight:700;text-align:right;}
#csca-root .csca-test-delta.pos{color:var(--red);}
#csca-root .csca-test-delta.neg{color:var(--ok);}
#csca-root .csca-test-rating{font-size:16px;text-align:center;}
#csca-root .csca-test-caret{font-size:12px;color:var(--muted);text-align:center;transition:transform .12s;}
#csca-root .csca-test-row.is-open .csca-test-caret{transform:rotate(180deg);}
#csca-root .csca-test-detail{display:none;border-top:1px solid var(--border);padding:16px;background:var(--surface2);}
#csca-root .csca-test-row.is-open .csca-test-detail{display:block;}
#csca-root .csca-test-detail pre{background:#1A1718;color:#E8E8E8;border-radius:8px;padding:12px 14px;font-size:11.5px;overflow-x:auto;max-height:260px;}
#csca-root .csca-test-notes{font-size:13px;color:var(--ink2);margin:10px 0;white-space:pre-wrap;}
#csca-root .csca-test-actions{display:flex;gap:10px;margin-top:10px;}
#csca-root .csca-test-actions button{
  font-family:'Titillium Web',sans-serif;font-weight:700;font-size:12.5px;
  border-radius:14px;padding:7px 16px;cursor:pointer;border:1px solid var(--border2);background:#fff;
}
#csca-root .csca-test-actions button.danger{color:var(--red);border-color:var(--red);}
#csca-root .csca-test-actions button.danger:hover{background:#FDE6E7;}
#csca-root .csca-test-actions button:not(.danger):hover{background:var(--surface3);}

/* ---- responsive ----------------------------------------------------------- */
@media(max-width:960px){
  #csca-root .csca-shell{grid-template-columns:1fr;gap:22px;}
  #csca-root .csca-panel{position:static;top:auto;}
  #csca-root .csca-metrics,#csca-root .csca-local-grid{grid-template-columns:repeat(2,1fr);}
  #csca-root .csca-specgrid{grid-template-columns:repeat(2,1fr);}
  #csca-root .csca-cols{grid-template-columns:1fr;}
  #csca-root .csca-save-grid{grid-template-columns:1fr;}
  #csca-root .csca-test-summary{grid-template-columns:1fr;gap:4px;}
  #csca-root .csca-test-gpm,#csca-root .csca-test-delta{text-align:left;}
}
@media(max-width:480px){
  #csca-root .csca-metrics,#csca-root .csca-local-grid{grid-template-columns:1fr;}
  #csca-root .csca-specgrid{grid-template-columns:1fr;}
}