/* ============================================================
   CALKCO SYSTEMS — shared design system
   Industrial instrument-panel language.
   Fonts: Archivo (display), IBM Plex Sans (body), IBM Plex Mono (data)
   ============================================================ */

:root{
  --concrete:#E7E7E1;
  --paper:#FCFCFA;
  --ink:#17191B;
  --muted:#5C6167;
  --line:#CBCBC3;
  --line-strong:#B4B4AA;
  --panel:#111517;
  --panel-line:#2A3033;
  --amber:#EBA31C;
  --amber-hi:#F4B02F;
  --green:#1E9A57;
  --green-hi:#42C97E;
  --red:#C0492F;
  --focus:#2E6FB0;
}

*{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;background:var(--concrete);color:var(--ink);
  font-family:"IBM Plex Sans",system-ui,sans-serif;line-height:1.5;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px;}
.mono{font-family:"IBM Plex Mono",monospace;}

/* ── header / nav ── */
header{border-bottom:1px solid var(--line-strong);position:sticky;top:0;background:var(--concrete);z-index:20;}
.bar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 0;}
.mark{display:flex;align-items:center;gap:11px;text-decoration:none;}
.mark .dot{width:12px;height:12px;background:var(--amber);border:1px solid var(--ink);flex:none;}
.mark b{font-family:"Archivo",sans-serif;font-weight:800;letter-spacing:.15em;font-size:15px;text-transform:uppercase;line-height:1;}
.mark span{font-size:10.5px;color:var(--muted);letter-spacing:.05em;}
nav.links{display:flex;align-items:center;gap:26px;}
nav.links a{font-size:14px;font-weight:500;text-decoration:none;color:var(--ink);}
nav.links a:hover{color:var(--amber);}
.cta{
  font-family:"IBM Plex Sans",sans-serif;font-weight:600;font-size:13px;text-decoration:none;
  color:var(--ink);border:1px solid var(--ink);padding:9px 15px;background:transparent;cursor:pointer;white-space:nowrap;
}
.cta:hover{background:var(--ink);color:var(--paper);}
.cta.solid{background:var(--amber);border-color:var(--amber);color:var(--ink);}
.cta.solid:hover{background:var(--amber-hi);border-color:var(--amber-hi);}

/* ── shared section bits ── */
.eyebrow{
  font-family:"IBM Plex Mono",monospace;font-size:12px;font-weight:600;letter-spacing:.2em;
  text-transform:uppercase;color:var(--muted);margin:0 0 16px;
}
h1{font-family:"Archivo",sans-serif;font-weight:800;font-size:clamp(30px,5.4vw,54px);line-height:1.02;letter-spacing:-.01em;margin:0 0 18px;}
h2.sect{font-family:"Archivo",sans-serif;font-weight:800;font-size:clamp(24px,3.6vw,34px);line-height:1.08;margin:0 0 14px;}
.lead{font-size:17px;color:var(--muted);max-width:56ch;}

/* ── hero (home) ── */
.hero{padding:64px 0 40px;}
.hero .lead{margin:0 0 26px;}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;}
.hero-strip{
  margin-top:44px;display:grid;grid-template-columns:repeat(3,1fr);gap:0;
  border:1px solid var(--line-strong);background:var(--paper);
}
.hero-strip div{padding:20px 22px;border-right:1px solid var(--line);}
.hero-strip div:last-child{border-right:none;}
.hero-strip .n{font-family:"IBM Plex Mono";font-weight:600;font-size:26px;color:var(--ink);line-height:1;}
.hero-strip .n b{color:var(--amber);font-weight:600;}
.hero-strip .l{font-size:12.5px;color:var(--muted);margin-top:8px;line-height:1.35;}

/* ── tool cards ── */
.section{padding:56px 0;border-top:1px solid var(--line-strong);}
.section .head-row{margin-bottom:32px;}
.tools{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}
.tool{
  display:flex;flex-direction:column;background:var(--paper);border:1px solid var(--line-strong);
  padding:24px;text-decoration:none;color:var(--ink);transition:border-color .15s,transform .15s;
}
.tool:hover{border-color:var(--ink);transform:translateY(-2px);}
.tool .idx{font-family:"IBM Plex Mono";font-size:12px;letter-spacing:.14em;color:var(--amber);margin-bottom:20px;}
.tool h3{font-family:"Archivo",sans-serif;font-weight:700;font-size:20px;line-height:1.12;margin:0 0 9px;}
.tool p{font-size:14px;color:var(--muted);margin:0 0 20px;flex:1;line-height:1.45;}
.tool .go{font-family:"IBM Plex Mono";font-size:13px;font-weight:600;letter-spacing:.02em;display:flex;align-items:center;gap:8px;}
.tool .go::after{content:"→";color:var(--amber);transition:transform .15s;}
.tool:hover .go::after{transform:translateX(4px);}

/* ── steps (how it works) ── */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border:1px solid var(--line-strong);background:var(--paper);}
.step{padding:28px 26px;border-right:1px solid var(--line);}
.step:last-child{border-right:none;}
.step .num{font-family:"IBM Plex Mono";font-weight:600;font-size:13px;letter-spacing:.14em;color:var(--amber);margin-bottom:16px;}
.step h4{font-family:"Archivo",sans-serif;font-weight:700;font-size:17px;margin:0 0 8px;}
.step p{font-size:14px;color:var(--muted);margin:0;line-height:1.45;}

/* ── about ── */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start;}
.about-grid p{font-size:15.5px;color:var(--ink);margin:0 0 15px;line-height:1.6;}
.about-grid p:last-child{margin-bottom:0;}
.credentials{background:var(--paper);border:1px solid var(--line-strong);padding:26px;}
.credentials .k{font-family:"IBM Plex Mono";font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:14px;}
.credentials ul{margin:0;padding:0;list-style:none;}
.credentials li{font-size:14.5px;padding:11px 0;border-bottom:1px solid var(--line);display:flex;gap:11px;align-items:baseline;}
.credentials li:last-child{border-bottom:none;}
.credentials li::before{content:"▸";color:var(--amber);flex:none;}

/* ── calculator (shared across tool pages) ── */
.calc{display:grid;grid-template-columns:1.15fr .85fr;gap:0;background:var(--paper);border:1px solid var(--line-strong);margin-bottom:14px;}
.inputs{padding:30px 30px 34px;border-right:1px solid var(--line);}
.group + .group{margin-top:26px;}
.group h2{
  font-family:"IBM Plex Mono",monospace;font-size:12px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ink);margin:0 0 15px;padding-bottom:9px;border-bottom:1px solid var(--line);display:flex;align-items:baseline;gap:9px;
}
.group h2 i{color:var(--amber);font-style:normal;font-family:"IBM Plex Mono";}
.group h2 .opt{color:var(--muted);font-weight:400;letter-spacing:0;text-transform:none;font-size:11px;}
.field{display:grid;grid-template-columns:1fr 128px;align-items:center;gap:12px;margin-bottom:13px;}
.field:last-child{margin-bottom:0;}
.field label{font-size:14px;color:var(--ink);}
.field label small{display:block;color:var(--muted);font-size:11.5px;line-height:1.3;margin-top:1px;}
.inbox{position:relative;}
.inbox .pre{position:absolute;left:11px;top:50%;transform:translateY(-50%);color:var(--muted);font-family:"IBM Plex Mono";font-size:13px;pointer-events:none;}
.inbox .suf{position:absolute;right:11px;top:50%;transform:translateY(-50%);color:var(--muted);font-family:"IBM Plex Mono";font-size:12px;pointer-events:none;}
input[type=number]{
  width:100%;font-family:"IBM Plex Mono",monospace;font-size:15px;font-weight:500;color:var(--ink);
  background:#fff;border:1px solid var(--line-strong);padding:9px 11px;text-align:right;
}
input.has-pre{padding-left:22px;}
input.has-suf{padding-right:34px;}
input[type=number]:focus{outline:2px solid var(--focus);outline-offset:-1px;border-color:var(--focus);}
input::-webkit-outer-spin-button,input::-webkit-inner-spin-button{opacity:.35;}

/* readout / HMI panel */
.readout{background:var(--panel);color:#EDEDE8;display:flex;flex-direction:column;}
.readout .head{display:flex;align-items:center;justify-content:space-between;padding:14px 22px;border-bottom:1px solid var(--panel-line);}
.readout .head span{font-family:"IBM Plex Mono";font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:#8A9298;}
.readout .head .live{display:flex;align-items:center;gap:7px;color:#8A9298;font-size:11px;font-family:"IBM Plex Mono";letter-spacing:.1em;}
.readout .head .live b{width:7px;height:7px;border-radius:50%;background:var(--amber);box-shadow:0 0 8px var(--amber);animation:pulse 2.4s ease-in-out infinite;}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.primary{padding:30px 22px 26px;border-bottom:1px solid var(--panel-line);}
.primary .k{font-family:"IBM Plex Mono";font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:#8A9298;margin-bottom:10px;}
.primary .v{font-family:"IBM Plex Mono",monospace;font-weight:600;font-size:clamp(34px,7vw,50px);line-height:1;color:var(--amber);letter-spacing:.01em;}
.primary .v small{font-size:.42em;color:#B9BEC2;letter-spacing:.05em;margin-left:4px;font-weight:500;}
.stats{display:grid;grid-template-columns:1fr 1fr;}
.stat{padding:18px 22px;}
.stat:nth-child(odd){border-right:1px solid var(--panel-line);}
.stat:nth-child(n+3){border-top:1px solid var(--panel-line);}
.stat .k{font-family:"IBM Plex Mono";font-size:10.5px;letter-spacing:.13em;text-transform:uppercase;color:#8A9298;margin-bottom:7px;}
.stat .v{font-family:"IBM Plex Mono",monospace;font-weight:600;font-size:19px;color:#EDEDE8;}
.stat .v.pos{color:var(--green-hi);}
.stat .v.neg{color:#E0715A;}

/* verdict */
.verdict{background:var(--paper);border:1px solid var(--line-strong);border-top:none;padding:18px 24px;font-size:15px;color:var(--ink);display:flex;gap:13px;align-items:flex-start;}
.verdict .tag{flex:none;font-family:"IBM Plex Mono";font-size:11px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;padding:3px 9px;border:1px solid;margin-top:1px;}
.verdict .tag.good{color:var(--green);border-color:var(--green);}
.verdict .tag.warn{color:var(--red);border-color:var(--red);}
.verdict strong{font-weight:600;}

/* page hero for calculator pages */
.calc-hero{padding:44px 0 26px;}
.calc-hero h1{font-size:clamp(26px,4.4vw,40px);margin-bottom:12px;}
.calc-hero .lead{font-size:16px;}

/* CTA band */
.band{background:var(--ink);color:var(--paper);padding:30px 34px;margin:40px 0 0;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;}
.band h3{font-family:"Archivo",sans-serif;font-weight:700;font-size:21px;margin:0 0 5px;}
.band p{color:#B7BBBE;font-size:14.5px;margin:0;max-width:48ch;}

/* ── lead capture / assessment ── */
.capture{background:var(--ink);color:var(--paper);padding:44px 40px;}
.capture .grid{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center;}
.capture h2{font-family:"Archivo",sans-serif;font-weight:800;font-size:30px;line-height:1.08;margin:0 0 14px;}
.capture p{color:#B7BBBE;font-size:15px;margin:0;}
form{display:grid;gap:11px;}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:11px;}
form input,form select{font-family:"IBM Plex Sans";font-size:14px;padding:11px 12px;background:#22262A;border:1px solid #34393D;color:var(--paper);width:100%;}
form input::placeholder{color:#7C8288;}
form input:focus,form select:focus{outline:2px solid var(--amber);outline-offset:-1px;}
form button{font-family:"Archivo",sans-serif;font-weight:700;font-size:15px;letter-spacing:.02em;background:var(--amber);color:var(--ink);border:none;padding:13px;cursor:pointer;margin-top:3px;}
form button:hover{background:var(--amber-hi);}
.thanks{display:none;padding:22px;border:1px solid #34393D;background:#22262A;font-size:15px;}
.thanks.on{display:block;}
.thanks b{color:var(--amber);}

/* ── notes / assumptions ── */
.notes{padding:34px 0 10px;}
.notes h4{font-family:"IBM Plex Mono";font-size:12px;letter-spacing:.14em;text-transform:uppercase;margin:0 0 14px;color:var(--ink);}
.notes dl{margin:0;display:grid;grid-template-columns:1fr 1fr;gap:14px 40px;}
.notes dt{font-weight:600;font-size:14px;margin-bottom:2px;}
.notes dd{margin:0;font-size:13.5px;color:var(--muted);line-height:1.45;}

footer{padding:30px 0 46px;color:var(--muted);font-size:12.5px;line-height:1.55;border-top:1px solid var(--line-strong);margin-top:56px;}
footer .frow{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;align-items:center;}
footer a{text-decoration:none;color:var(--muted);}
footer a:hover{color:var(--ink);}
footer nav{display:flex;gap:18px;}

/* ── responsive ── */
@media (max-width:900px){
  .tools,.hero-strip,.steps{grid-template-columns:1fr;}
  .hero-strip div{border-right:none;border-bottom:1px solid var(--line);}
  .hero-strip div:last-child{border-bottom:none;}
  .step{border-right:none;border-bottom:1px solid var(--line);}
  .step:last-child{border-bottom:none;}
  .about-grid,.capture .grid{grid-template-columns:1fr;gap:28px;}
  .notes dl{grid-template-columns:1fr;}
}
@media (max-width:820px){
  .calc{grid-template-columns:1fr;}
  .inputs{border-right:none;border-bottom:1px solid var(--line);}
}
@media (max-width:680px){
  nav.links{display:none;}
}
@media (max-width:480px){
  .field{grid-template-columns:1fr 108px;}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important;}
}

/* ── anchor offset so sticky header doesn't cover section headings ── */
#tools,#how,#about,#assessment{scroll-margin-top:82px;}