/* ── Tokens ─────────────────────────────────────────────────────── */
:root{
  --ink:        #1B2A41;   /* headline / body navy-ink            */
  --ink-soft:   #4A5A70;   /* secondary text                      */
  --navy:       #244061;   /* brand header navy (from the app)    */
  --paper:      #FAFBFC;   /* cool graph-paper white              */
  --grid:       #E3E9F0;   /* hairline cell borders               */
  --ledger:     #1F7A5C;   /* money green — totals & CTAs         */
  --ledger-dk:  #166047;
  --cell-yellow:#FFE9A8;   /* the app's input-cell highlight      */
  --cell-yellow-soft:#FFF4CE;
  --row-alt:    #F1F5FA;   /* alt-row tint (from the app)         */
  --white:      #FFFFFF;

  --serif: "IBM Plex Serif", Georgia, serif;
  --sans:  "IBM Plex Sans", -apple-system, "Segoe UI", sans-serif;
  --mono:  "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  --wrap: 1120px;
  --radius: 6px;
  --shadow: 0 1px 2px rgba(27,42,65,.06), 0 8px 28px rgba(27,42,65,.09);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}
body{
  font:16px/1.6 var(--sans);
  color:var(--ink);
  background:var(--paper);
}
img,svg{display:block}
a{color:var(--navy)}
:focus-visible{outline:3px solid var(--ledger);outline-offset:2px;border-radius:2px}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.mono{font-family:var(--mono)}
.hl{background:linear-gradient(transparent 55%, var(--cell-yellow) 55%);padding:0 .12em}

/* section eyebrow — styled like a cell reference, because that's
   how estimators actually navigate: by cell, not by chapter */
.cellref{
  font:600 12px/1 var(--mono);
  letter-spacing:.08em;
  color:var(--ink-soft);
  display:inline-flex;align-items:center;gap:8px;
  margin-bottom:14px;
}
.cellref::before{
  content:attr(data-ref);
  background:var(--white);border:1px solid var(--grid);
  padding:4px 7px;border-radius:3px;color:var(--navy);
}

h2{font-family:var(--serif);font-weight:700;font-size:clamp(26px,3.4vw,38px);line-height:1.15;letter-spacing:-.01em}
.sub{color:var(--ink-soft);max-width:56ch;margin-top:12px}
section{padding:88px 0}

/* ── Buttons ───────────────────────────────────────────────────── */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  font:600 15px/1 var(--sans);
  padding:14px 22px;border-radius:var(--radius);
  text-decoration:none;border:1px solid transparent;
  transition:transform .12s ease, box-shadow .12s ease, background .12s ease;
  cursor:pointer;
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-primary{background:var(--ledger);color:#fff;box-shadow:0 2px 0 var(--ledger-dk)}
.btn-primary:hover{background:var(--ledger-dk)}
.btn-ghost{background:var(--white);color:var(--navy);border-color:var(--grid)}
.btn-ghost:hover{border-color:var(--navy)}
.btn .arrow{transition:transform .12s ease}
.btn:hover .arrow{transform:translateX(3px)}

/* ── Nav ───────────────────────────────────────────────────────── */
header.site{
  position:sticky;top:0;z-index:50;
  background:rgba(250,251,252,.92);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--grid);
}
.nav{display:flex;align-items:center;gap:28px;height:64px}
.logo{display:flex;align-items:center;gap:10px;font:700 19px var(--serif);color:var(--ink);text-decoration:none}
.logo .mark{
  width:30px;height:30px;border-radius:5px;background:var(--navy);
  color:var(--cell-yellow);font:700 14px/30px var(--mono);text-align:center;
}
.nav-links{display:flex;gap:22px;margin-left:auto}
.nav-links a{font:500 14px var(--sans);color:var(--ink-soft);text-decoration:none}
.nav-links a:hover{color:var(--ink)}
.nav .btn{padding:10px 16px;font-size:14px}
@media (max-width:820px){.nav-links{display:none}}

/* ── Hero ──────────────────────────────────────────────────────── */
.hero{
  padding:76px 0 92px;
  background:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size:34px 34px;
  background-position:center top;
  border-bottom:1px solid var(--grid);
  position:relative;
}
.hero::after{ /* fade the graph paper toward the bottom */
  content:"";position:absolute;inset:auto 0 0 0;height:140px;
  background:linear-gradient(transparent, var(--paper));pointer-events:none;
}
.hero .wrap{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:56px;align-items:center;position:relative;z-index:1}
.hero h1{font-family:var(--serif);font-weight:700;font-size:clamp(34px,4.6vw,54px);line-height:1.08;letter-spacing:-.015em}
.hero .tagline{font:600 13px var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--ledger);margin-bottom:18px}
.hero p.lede{color:var(--ink-soft);font-size:18px;margin:20px 0 30px;max-width:46ch}
.hero .cta-row{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.trial-note{font:500 13px var(--mono);color:var(--ink-soft)}
.suite-badges{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.suite-badges span{white-space:nowrap}
.suite-badges span{
  font:500 12px var(--mono);color:var(--ink-soft);
  background:var(--white);border:1px solid var(--grid);
  padding:6px 10px;border-radius:4px;
}
/* hero trust strip — ledger checkmarks */
.trust-strip{display:flex;flex-direction:column;gap:10px;margin-top:26px}
.trust-strip span{font-size:14px;color:var(--ink-soft);padding-left:26px;position:relative}
.trust-strip span::before{
  content:"\2713";position:absolute;left:0;top:0;
  color:var(--ledger);font-weight:700;
}
.trust-strip b{color:var(--ink)}
@media (max-width:920px){
  .hero .wrap{grid-template-columns:1fr}
  .hero-sheet{max-width:560px}
}

/* ── The signature: a takeoff sheet that runs itself ───────────── */
.hero-sheet{
  background:var(--white);border:1px solid var(--grid);border-radius:8px;
  box-shadow:var(--shadow);overflow:hidden;
  font:13px/1.4 var(--mono);
}
.sheet-tabs{display:flex;gap:2px;background:var(--row-alt);border-bottom:1px solid var(--grid);padding:8px 10px 0}
.sheet-tabs span{
  padding:6px 12px;border:1px solid var(--grid);border-bottom:none;
  border-radius:5px 5px 0 0;background:#EAEFF6;color:var(--ink-soft);font-size:11px;
}
.sheet-tabs .on{background:var(--white);color:var(--ink);font-weight:600}
.sheet table{width:100%;border-collapse:collapse}
.sheet th{
  background:var(--navy);color:#fff;font-weight:500;font-size:11px;
  text-align:left;padding:7px 9px;letter-spacing:.03em;
}
.sheet td{padding:7px 9px;border-bottom:1px solid var(--grid);white-space:nowrap}
.sheet tr:nth-child(even) td{background:var(--row-alt)}
.sheet .num{text-align:right}
.sheet .typ{font-size:10px;font-weight:600;padding:2px 6px;border-radius:3px}
.typ.scope{background:#DCEFE7;color:var(--ledger-dk)}
.typ.matl{background:#E4ECF7;color:var(--navy)}
.typ.labr{background:#F3E8F7;color:#6B3E82}
.typ.subc{background:#FBEBDD;color:#9A5B1F}
.typ.weld{background:#E7E1F5;color:#5B3E9E}
.typ.burn{background:#FBE9E7;color:#A63A2A}
.typ.auto{background:var(--cell-yellow);color:#7A5A00}
.sheet .row-anim{opacity:0;transform:translateY(4px);animation:rowIn .45s ease forwards}
@keyframes rowIn{to{opacity:1;transform:none}}
.sheet .auto-row td{background:var(--cell-yellow-soft)!important}
.sheet tfoot td{
  border-top:2px solid var(--ink);border-bottom:none;
  font-weight:600;background:var(--white)!important;
}
.sheet tfoot .grand{color:var(--ledger-dk);font-size:15px}
.sheet-caption{
  display:flex;justify-content:space-between;align-items:center;
  padding:9px 12px;background:var(--row-alt);border-top:1px solid var(--grid);
  font-size:11px;color:var(--ink-soft);
}
.sheet-caption .run{color:var(--ledger-dk);font-weight:600}

/* ── Pipeline strip ────────────────────────────────────────────── */
.pipeline{padding:56px 0;border-bottom:1px solid var(--grid)}
.pipe-row{display:flex;align-items:center;gap:0;flex-wrap:wrap;justify-content:center}
.pipe{
  background:var(--white);border:1px solid var(--grid);border-radius:var(--radius);
  padding:14px 20px;text-align:center;min-width:130px;
}
.pipe b{display:block;font:600 14px var(--sans)}
.pipe small{font:400 12px var(--mono);color:var(--ink-soft)}
.pipe-arrow{font:600 18px var(--mono);color:var(--ledger);padding:0 14px}
.pipe-note{text-align:center;margin-top:18px;font:500 13px var(--mono);color:var(--ink-soft)}
@media (max-width:760px){.pipe-arrow{transform:rotate(90deg);padding:6px 0}.pipe-row{flex-direction:column}}

/* ── Features ──────────────────────────────────────────────────── */
.feat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--grid);border:1px solid var(--grid);border-radius:8px;overflow:hidden;margin-top:44px}
.feat{background:var(--white);padding:28px 26px}
.feat:hover{background:var(--row-alt)}
.feat .fx{font:600 11px var(--mono);color:var(--ledger);letter-spacing:.06em}
.feat h3{font:600 17px var(--sans);margin:10px 0 8px}
.feat p{font-size:14px;color:var(--ink-soft)}
@media (max-width:880px){.feat-grid{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.feat-grid{grid-template-columns:1fr}}

/* ── Profiles ──────────────────────────────────────────────────── */
.profiles{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:44px}
.profile{
  background:var(--white);border:1px solid var(--grid);border-radius:8px;
  padding:30px;box-shadow:var(--shadow);
}
.profile h3{font:700 21px var(--serif)}
.profile .who{font:500 12px var(--mono);color:var(--ledger-dk);letter-spacing:.06em;text-transform:uppercase}
.profile ul{list-style:none;margin-top:16px}
.profile li{padding:7px 0 7px 24px;font-size:14px;color:var(--ink-soft);position:relative}
.profile li::before{content:"·";position:absolute;left:8px;color:var(--ledger);font-weight:700}
.profile .types{margin-top:16px;display:flex;flex-wrap:wrap;gap:6px}
.profile .types span{font:500 11px var(--mono);background:var(--row-alt);border:1px solid var(--grid);padding:3px 8px;border-radius:3px}
@media (max-width:820px){.profiles{grid-template-columns:1fr}}

/* ── Pricing ───────────────────────────────────────────────────── */
#pricing{background:var(--white);border-block:1px solid var(--grid)}
.trial-banner{
  margin:40px 0 34px;display:flex;align-items:center;gap:14px;justify-content:center;
  background:var(--cell-yellow-soft);border:1px dashed #E4C860;border-radius:var(--radius);
  padding:14px 20px;font:500 14px var(--sans);
}
.trial-banner .mono{font-weight:600;color:var(--ledger-dk)}
.tiers{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;align-items:stretch;max-width:820px;margin:0 auto}
.tier{
  background:var(--paper);border:1px solid var(--grid);border-radius:8px;
  padding:30px 28px;display:flex;flex-direction:column;position:relative;
}
.tier.featured{
  background:var(--white);border-color:var(--navy);
  box-shadow:var(--shadow);transform:translateY(-8px);
}
.tier .flag{
  position:absolute;top:-13px;left:50%;transform:translateX(-50%);
  background:var(--navy);color:var(--cell-yellow);
  font:600 11px var(--mono);letter-spacing:.08em;
  padding:5px 12px;border-radius:99px;white-space:nowrap;
}
.tier h3{font:700 22px var(--serif)}
.tier .for{font-size:13px;color:var(--ink-soft);margin-top:4px;min-height:38px}
.tier .price{font:600 40px var(--mono);margin:18px 0 2px;letter-spacing:-.02em}
.tier .price small{font-size:14px;color:var(--ink-soft);font-weight:400}
.tier .per{font:400 12px var(--mono);color:var(--ink-soft);margin-bottom:20px}
.tier .btn{justify-content:center;margin-bottom:22px}
/* feature list styled as ledger rows — row numbers carry the count */
.tier ol{list-style:none;counter-reset:row;border-top:1px solid var(--grid)}
.tier ol li{
  counter-increment:row;
  display:flex;gap:12px;align-items:baseline;
  padding:9px 2px;border-bottom:1px solid var(--grid);
  font-size:14px;
}
.tier ol li::before{
  content:counter(row);
  font:500 11px var(--mono);color:#9AA7B8;min-width:16px;text-align:right;
}
.tier ol li.inherit{color:var(--ink-soft);font-style:italic}
@media (max-width:880px){
  .tiers{grid-template-columns:1fr;max-width:460px;margin:0 auto}
  .tier.featured{transform:none}
}
.pricing-fine{margin-top:30px;text-align:center;font-size:13px;color:var(--ink-soft)}

/* ── Resources / community ─────────────────────────────────────── */
#resources{background:var(--navy);color:#DCE6F1}
#resources h2{color:#fff}
#resources .cellref{color:#9FB2CC}
#resources .cellref::before{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.18);color:var(--cell-yellow)}
#resources .sub{color:#AFC0D8}
.res-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:44px}
.res{
  display:block;text-decoration:none;color:inherit;
  background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.14);
  border-radius:8px;padding:24px 22px;
  transition:background .12s ease, border-color .12s ease, transform .12s ease;
}
.res:hover{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.35);transform:translateY(-2px)}
.res .ricon{width:34px;height:34px;margin-bottom:14px;color:var(--cell-yellow)}
.res b{display:block;font:600 16px var(--sans);color:#fff}
.res p{font-size:13px;color:#AFC0D8;margin-top:6px}
.res .rlink{font:500 12px var(--mono);color:var(--cell-yellow);margin-top:12px;display:inline-block}
@media (max-width:880px){.res-grid{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.res-grid{grid-template-columns:1fr}}

/* ── FAQ ───────────────────────────────────────────────────────── */
.faq{max-width:760px;margin:44px auto 0}
.faq details{border-bottom:1px solid var(--grid)}
.faq summary{
  font:600 16px var(--sans);padding:18px 4px;cursor:pointer;list-style:none;
  display:flex;justify-content:space-between;align-items:center;gap:16px;
}
.faq summary::after{content:"+";font:400 22px var(--mono);color:var(--ledger)}
.faq details[open] summary::after{content:"–"}
.faq details p{padding:0 4px 20px;color:var(--ink-soft);font-size:15px;max-width:64ch}

/* ── Final CTA + footer ────────────────────────────────────────── */
.final{border-top:1px solid var(--grid);text-align:center}
.final h2{max-width:20ch;margin:0 auto}
.final .cta-row{justify-content:center;display:flex;gap:14px;margin-top:30px;flex-wrap:wrap}
footer.site{border-top:1px solid var(--grid);padding:36px 0;font-size:13px;color:var(--ink-soft)}
footer .wrap{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;align-items:center}
footer nav{display:flex;gap:18px;flex-wrap:wrap}
footer a{color:var(--ink-soft);text-decoration:none}
footer a:hover{color:var(--ink)}

/* NOTE (2026-09-28): the scroll-reveal animation was REMOVED. A CSS
   specificity bug left card grids permanently invisible (grey boxes),
   so content is plain static HTML+CSS now — it cannot be hidden by
   JS failure, browser quirks, or cascade mistakes. */
/* ── Multi-page nav active state ── */
.nav-links a.active{color:var(--ink);font-weight:600}

/* ── API pricing table ── */
.api-tiers{max-width:820px;margin:44px auto 0}
.api-table{width:100%;border-collapse:collapse;margin-top:20px;font-size:14px}
.api-table th{text-align:left;padding:10px 14px;background:var(--row-alt);font:600 11px var(--mono);letter-spacing:.06em;color:var(--ink-soft);border-bottom:2px solid var(--grid)}
.api-table td{padding:10px 14px;border-bottom:1px solid var(--grid)}
.api-table .free{color:var(--ledger);font-weight:600}

/* ── Docs layout ── */
.docs-grid{display:grid;grid-template-columns:240px 1fr;gap:40px;align-items:start;margin-top:44px}
.docs-sidebar{position:sticky;top:80px}
.docs-sidebar h4{font:600 11px var(--mono);letter-spacing:.08em;color:var(--ink-soft);margin-bottom:12px;text-transform:uppercase}
.docs-sidebar ul{list-style:none}
.docs-sidebar li{margin-bottom:2px}
.docs-sidebar a{font:500 13px var(--sans);color:var(--ink-soft);text-decoration:none;display:block;padding:4px 0}
.docs-sidebar a:hover{color:var(--navy)}
.docs-content h2{font-size:28px;margin-top:40px;margin-bottom:16px}
.docs-content h2:first-child{margin-top:0}
.docs-content h3{font:600 18px var(--sans);margin:24px 0 10px}
.docs-content p{margin-bottom:14px;color:var(--ink-soft);line-height:1.7}
.docs-content ul,.docs-content ol{margin-bottom:14px;padding-left:20px;color:var(--ink-soft)}
.docs-content table{width:100%;border-collapse:collapse;margin:16px 0 24px;font-size:14px}
.docs-content th{text-align:left;padding:8px 12px;background:var(--row-alt);font:600 11px var(--mono);letter-spacing:.06em;color:var(--ink-soft);border-bottom:2px solid var(--grid)}
.docs-content td{padding:8px 12px;border-bottom:1px solid var(--grid)}
.docs-content code{background:var(--row-alt);padding:1px 6px;border-radius:3px;font:13px var(--mono)}
.docs-content pre{background:var(--navy);color:#DCE6F1;padding:16px 20px;border-radius:var(--radius);overflow-x:auto;margin:12px 0 20px;font:13px/1.6 var(--mono)}
.docs-content hr{margin:32px 0;border:none;border-top:1px solid var(--grid)}
@media (max-width:820px){.docs-grid{grid-template-columns:1fr}.docs-sidebar{position:static}}

/* ── Engine page cards ── */
.engine-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--grid);border:1px solid var(--grid);border-radius:8px;overflow:hidden;margin-top:44px}
.eng-card{background:var(--white);padding:28px 26px}
.eng-card:hover{background:var(--row-alt)}
.eng-card .ex{font:600 11px var(--mono);color:var(--ledger);letter-spacing:.06em}
.eng-card h3{font:600 17px var(--sans);margin:10px 0 8px}
.eng-card p{font-size:14px;color:var(--ink-soft)}
.eng-card .math{font:500 13px var(--mono);color:var(--ledger-dk);margin-top:8px}
@media (max-width:760px){.engine-grid{grid-template-columns:1fr}}

/* ── Section variations ── */
.section-alt{background:var(--white);border-block:1px solid var(--grid)}
.section-dark{background:var(--navy);color:#DCE6F1}
.section-dark h2{color:#fff}
.section-dark .cellref{color:#9FB2CC}
.section-dark .cellref::before{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.18);color:var(--cell-yellow)}
.section-dark .sub{color:#AFC0D8}