:root{color-scheme:dark;--bg:#0b0e15;--panel:#111620;--muted:#929bae;--text:#edf1f8;--border:#283040;--accent:#b6a1ff;--mint:#8de6c2;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 82% 0%,#211a353d,transparent 45%),var(--bg);color:var(--text)}button,textarea,select,input{font:inherit}a{color:inherit;text-decoration:none}button,a,textarea,input,select{touch-action:manipulation}button{cursor:pointer}button:disabled{opacity:.35;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--accent);outline-offset:4px}button{color:var(--text);border:1px solid var(--border);border-radius:7px;background:#1a202d;padding:7px 12px}button:hover{border-color:#766a98}button:disabled:hover{border-color:var(--border)}.tool-shell{max-width:1380px;margin:auto;padding:0 48px}.topbar{height:96px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:12px;font-size:13px;font-weight:750;letter-spacing:2px}.brand-mark{width:25px;height:25px;border-radius:8px;background:linear-gradient(135deg,#a389ff,#68dcda);box-shadow:0 0 28px #a389ff22}.brand-divider{margin:0 5px;color:#485265;font-weight:400}.brand-sub{color:var(--muted);font-size:11px;letter-spacing:1.5px}.privacy{font-size:12px;color:var(--muted)}.privacy span{font-size:8px;color:var(--mint);margin-right:8px}.intro{padding:47px 0 37px}.eyebrow{font-size:10px;font-weight:700;letter-spacing:2px;color:var(--accent);margin:0 0 13px}h1{font-size:clamp(29px,3.4vw,46px);line-height:1.17;letter-spacing:-1.9px;margin:0 0 15px;font-weight:600}h1 span{color:#9ca5b8}.intro>p:last-child{font-size:14px;color:var(--muted);line-height:1.6}.workspace{display:grid;grid-template-columns:240px minmax(0,1fr);gap:26px;align-items:start}.sidebar{padding:9px 0}.nav-label{font-size:10px;letter-spacing:1.8px;color:#7d899d;margin:0 12px 20px;display:flex;justify-content:space-between}.nav-label span{color:#566175}nav{display:grid;gap:6px}nav a{display:flex;align-items:center;gap:13px;padding:14px 12px;border:1px solid transparent;border-radius:10px;font-size:13px;color:#c2c9d7;transition:background .15s}nav a:hover{background:#171d29}nav a[aria-current=page]{background:#211c34;border-color:#4a3b6e;color:#dfd4ff}.tool-icon{width:32px;height:32px;background:#1b2230;border-radius:8px;display:grid;place-items:center;font:14px ui-monospace,monospace;color:#aab5c9}nav a[aria-current=page] .tool-icon{background:#3d2e5d;color:#d7c5ff}.nav-description{display:block;font-size:11px;color:var(--muted);margin-top:5px}.nav-arrow{margin-left:auto;opacity:0}nav a[aria-current=page] .nav-arrow{opacity:1}.private-note{margin:34px 12px 0;border-top:1px solid var(--border);padding-top:24px;color:var(--muted);font-size:12px;line-height:1.7}.private-note>span{color:var(--mint);display:block;font-size:20px;margin-bottom:8px}.private-note strong{font-size:12px;font-weight:500;color:#c9d2df}.private-note p{margin:5px 0}.tool-panel{min-width:0;padding:30px;background:linear-gradient(130deg,#151a26,#10151f);border:1px solid var(--border);border-radius:16px;box-shadow:0 15px 50px #0002}.panel-heading{display:flex;justify-content:space-between;gap:16px;align-items:center}.panel-heading .eyebrow{font-size:9px;margin-bottom:9px;color:#7f8da5}h2{font-size:25px;font-weight:550;letter-spacing:-.8px;margin:0}.live-badge{font-size:9px;font-weight:600;letter-spacing:1.6px;color:var(--mint);padding:5px 8px;border:1px solid #31594c;background:#152820;border-radius:5px}.panel-description{font-size:13px;color:var(--muted);line-height:1.65;margin:14px 0 24px;max-width:650px}.controls{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:18px;font-size:12px;color:var(--muted)}.controls:empty{display:none}.controls label{display:flex;align-items:center;gap:8px}.controls input{accent-color:var(--accent)}select{background:#131a26;border:1px solid var(--border);color:var(--text);border-radius:6px;padding:6px;max-width:100%}.editors{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:16px}.editor{min-width:0;position:relative;border:1px solid #303849;background:#0c111a;border-radius:10px;overflow:hidden}.editor:focus-within{border-color:#9a83d6}.editor-heading{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:12px 14px;border-bottom:1px solid #242c3b;background:#171d28}.editor-heading label,.editor-heading>span{font-size:10px;letter-spacing:1.4px;font-weight:650;color:#b4bfd0}.copy-button{padding:4px 8px;background:transparent;border:0;font-size:11px;color:var(--muted);letter-spacing:0}.editor textarea,.formula-output{display:block;width:100%;min-height:300px;height:300px;margin:0;padding:16px;border:0;background:transparent;color:#e0e7f2;resize:vertical;font:13px/1.85 ui-monospace,SFMono-Regular,Consolas,monospace;tab-size:2;outline:none;overflow:auto;overflow-wrap:normal;white-space:pre}.editor textarea{white-space:pre-wrap;overflow-wrap:anywhere}.editor textarea::placeholder{color:#566278}.editor-meta{border-top:1px solid #242c3b;color:#66758b;font-size:10px;padding:9px 14px;min-height:31px}.panel-bottom{margin-top:16px;display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:30px}.panel-bottom p{margin:0;font-size:12px;color:var(--mint);line-height:1.6}.panel-bottom p.error{color:#ffa3ad}.text-button{border:0;background:transparent;color:var(--muted);padding:6px 0;white-space:nowrap;font-size:11px}.hint{font-size:11px;line-height:1.8;color:#8090a7;margin:12px 0 0}.step-heading{display:flex;justify-content:space-between;align-items:center;margin-top:22px;padding-top:20px;border-top:1px solid var(--border);font-size:9px;letter-spacing:1.6px;color:var(--muted)}.step-heading button{padding:3px 9px;margin-left:5px}.formula-steps{display:flex;flex-wrap:wrap;gap:7px;margin-top:12px}.formula-steps button{font:11px ui-monospace,monospace;padding:6px 9px;background:#151c28}.formula-steps button.selected{border-color:var(--accent);background:#2b2240}.formula-output .function{color:#d6b2ff}.formula-output .string{color:#9bdbbb}.formula-output .number{color:#ffc797}.formula-output .reference{color:#a6c9f0}.formula-output .bracket{font-weight:700;cursor:pointer;border-radius:3px}.formula-output .paired{background:#4e3d70;box-shadow:0 0 0 2px #a88ee2}.formula-output .invalid{color:#ff8b9e;text-decoration:underline wavy}footer{display:flex;justify-content:space-between;gap:20px;margin:30px 0 32px;padding-top:20px;border-top:1px solid var(--border);color:#6c7990;font-size:11px}footer a{color:#a2adc0}noscript{display:block;padding:20px;text-align:center}
@media(min-width:1500px){.intro{padding-top:65px}}@media(max-width:1000px){.tool-shell{padding:0 26px}.workspace{grid-template-columns:200px minmax(0,1fr);gap:18px}.tool-panel{padding:23px}.editors{grid-template-columns:1fr}.editor textarea,.formula-output{min-height:210px;height:230px}}@media(max-width:650px){.tool-shell{padding:0 18px}.topbar{height:76px}.brand{gap:8px;font-size:11px}.brand-sub{font-size:9px}.privacy{font-size:0}.privacy span{font-size:9px}.intro{padding:30px 0 20px}h1{letter-spacing:-1px}.intro>p:last-child{font-size:12px}.workspace{display:block}.sidebar{padding:0 0 18px}.nav-label,.private-note,.nav-description,.nav-arrow{display:none}nav{display:flex;overflow:auto;gap:8px;padding:3px 2px 8px}nav a{flex-shrink:0;padding:9px 11px;background:#131a25;gap:8px;font-size:11px;border-color:var(--border)}.tool-icon{height:24px;width:24px;font-size:12px}.tool-panel{padding:20px 16px;border-radius:12px}h2{font-size:23px}.panel-description{font-size:12px}.editor textarea,.formula-output{font-size:12px}.panel-bottom{gap:10px}footer{font-size:10px;line-height:1.7;margin-top:22px}.controls{font-size:11px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}

[hidden]{display:none!important}
.tool-search-label{display:block;font-size:10px;color:var(--muted);margin:0 12px 7px}.tool-search{width:calc(100% - 24px);margin:0 12px 15px;padding:10px 11px;border:1px solid var(--border);border-radius:8px;background:#101722;color:var(--text);font-size:12px}nav{max-height:510px;overflow-y:auto;scrollbar-width:thin;scrollbar-color:#413653 transparent}.controls .control-field{display:flex;flex-direction:column;align-items:stretch;gap:7px;flex:1 1 220px}.control-field input{width:100%;min-width:0;padding:10px;border:1px solid var(--border);border-radius:6px;background:#0c111a;color:var(--text);font:12px ui-monospace,monospace}.diff-output{padding:16px;border:1px solid var(--border);border-radius:8px;background:#0c111a;max-height:400px;min-height:80px;overflow:auto;white-space:pre-wrap;overflow-wrap:anywhere;font:13px/1.9 ui-monospace,monospace}.diff-added{color:#b0efd0;background:#1c4938;text-decoration:underline;text-decoration-thickness:2px}.diff-removed{color:#ffb3c3;background:#502534;text-decoration:line-through}.diff-legend{display:flex;gap:10px;letter-spacing:0}.diff-legend>span{padding:3px 6px;border-radius:3px}.diff-output:focus-visible{outline:2px solid var(--accent)}
@media(max-width:650px){.tool-search-label{display:none}.tool-search{width:100%;margin:0 0 10px}.sidebar nav{max-height:none;overflow-x:auto;overflow-y:hidden}.control-field input{font-size:14px}.diff-output{font-size:12px}}

/* Roomier editing surfaces and a structural Excel walkthrough. */
.tool-shell{max-width:1640px;padding:0 40px}.workspace{grid-template-columns:250px minmax(0,1fr);gap:30px}.tool-panel{padding:34px}.intro{padding:38px 0 30px}.intro>p:last-child,.panel-description{font-size:15px}.panel-description{max-width:850px}.editors{gap:20px}.editor textarea,.formula-output{height:420px;min-height:320px;font-size:15px;line-height:1.9}.editor-heading label,.editor-heading>span{font-size:11px}.editor-meta{font-size:11px}.controls{font-size:13px}.hint{font-size:12px}.formula-output .walk-current{background:#b6a1ff16}.walkthrough{margin-top:24px}.walk-controls{display:flex;flex-wrap:wrap;align-items:center;gap:9px;margin:16px 0}.walk-controls button{font-size:12px;padding:9px 12px}.walk-controls #walk-next{background:#c5b4ff;border-color:#c5b4ff;color:#171020;font-weight:650}.walk-card{padding:22px;border:1px solid #493d63;border-radius:10px;background:#191525}.walk-card .eyebrow{font-size:10px;overflow-wrap:anywhere;line-height:1.7}.walk-card h3{font-size:19px;letter-spacing:-.4px;font-weight:550;margin:0}.walk-card pre{margin:14px 0 0;padding:14px;background:#100e19;border-radius:6px;white-space:pre-wrap;overflow-wrap:anywhere;font:14px/1.9 ui-monospace,monospace;max-height:240px;overflow:auto}.walk-outline{margin-top:18px;font-size:12px;color:var(--muted)}.walk-outline summary{cursor:pointer;padding:6px 0}.walk-outline ol{margin:12px 0 0;padding:0;list-style:none;display:grid;gap:6px;max-height:320px;overflow:auto}.walk-outline button{width:100%;text-align:left;background:#111722;border:1px solid var(--border);padding:10px 12px;font-size:12px}.walk-outline button.selected{background:#2b2240;border-color:var(--accent);color:#eadfff}.walkthrough .step-heading{gap:14px;line-height:1.7}.walkthrough .step-heading>span:last-child{letter-spacing:0;text-transform:none;white-space:nowrap;color:var(--accent)}
@media(min-width:1500px){.intro{padding-top:46px}}@media(max-width:1100px){.tool-shell{padding:0 26px}.workspace{grid-template-columns:210px minmax(0,1fr);gap:20px}.tool-panel{padding:26px}.editors{grid-template-columns:1fr}.editor textarea,.formula-output{height:340px;min-height:280px}.walk-card{padding:18px}}@media(max-width:650px){.tool-shell{padding:0 18px}.workspace{display:block}.tool-panel{padding:22px 16px}.intro{padding:28px 0 20px}.intro>p:last-child,.panel-description{font-size:14px}.editor textarea,.formula-output{height:320px;min-height:260px;font-size:14px}.walk-controls{gap:7px}.walk-controls button{font-size:11px;padding:9px}.walk-card pre{font-size:13px}.walk-card h3{font-size:17px}}

/* Compact tools header: begin directly with the workspace. */
.workspace{margin-top:32px}.panel-heading h1{font-size:25px;font-weight:550;letter-spacing:-.8px;line-height:1.2;margin:0}@media(max-width:650px){.workspace{margin-top:22px}.panel-heading h1{font-size:23px}}

/* Fill tall desktop viewports with working space instead of an empty page tail. */
footer{margin:18px 0 14px;padding-top:14px}
@media(min-width:1101px){
  .tool-shell{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column}
  .topbar{flex-shrink:0}
  .workspace{flex:1;align-items:stretch}
  .tool-panel{display:flex;flex-direction:column;min-height:0}
  .editors{flex:1;min-height:0;align-items:stretch}
  .editor{display:flex;flex-direction:column;min-height:0}
  .editor-heading,.editor-meta{flex-shrink:0}
  .editor textarea,.formula-output{height:320px;min-height:320px;flex:1 0 auto}
  .sidebar{display:flex;flex-direction:column;min-height:0}
  .sidebar nav{flex:1 1 0;min-height:240px;max-height:none}
  .private-note{flex-shrink:0;margin-top:22px;padding-top:18px}
  .tool-shell>footer{flex-shrink:0}
}