/* ============================================================
   Corps Business Support — the drawing sheet
   Blueprint grid, title block, sheet numbering, tick rules.
   ============================================================ */
:root{
  --paper:#E9E7E2; --paper-2:#F3F2EE; --ink:#14181C; --ink-2:#4A5058;
  --blue:#123A5C; --blue-2:#1E5A8A; --amber:#F2A007; --amber-d:#C77F04;
  --rule:#C6C2B8; --rule-2:#A9A497; --red:#B03A2E; --green:#3E7A48;
  --shell:min(1200px,93vw);
  --sans:'IBM Plex Sans',system-ui,sans-serif;
  --disp:'Archivo',system-ui,sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);
  font-size:16.5px;line-height:1.65;-webkit-font-smoothing:antialiased;
  background-image:linear-gradient(var(--rule) 1px,transparent 1px),
    linear-gradient(90deg,var(--rule) 1px,transparent 1px);
  background-size:56px 56px;background-position:-1px -1px;background-attachment:fixed}
body::before{content:'';position:fixed;inset:0;background:var(--paper);opacity:.72;
  pointer-events:none;z-index:0}
body>*{position:relative;z-index:1}
img{max-width:100%;display:block}
a{color:var(--blue-2);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
:focus-visible{outline:3px solid var(--amber);outline-offset:2px}
h1,h2,h3,h4{font-family:var(--disp);font-weight:800;line-height:1.06;margin:0;
  letter-spacing:-.02em}
p{margin:0 0 1rem}
.shell{width:var(--shell);margin-inline:auto}
.skip{position:absolute;left:-9999px}
.skip:focus{left:1rem;top:1rem;z-index:99;background:var(--amber);color:var(--ink);padding:.6rem 1rem}
code{font-family:var(--mono);font-size:.86em;background:#DCD9D1;padding:.1em .35em}

/* header */
.top{position:sticky;top:0;z-index:40;background:rgba(233,231,226,.96);
  border-bottom:2px solid var(--ink);backdrop-filter:blur(8px)}
.top .shell{display:flex;align-items:stretch;gap:0;height:72px}
.brand{display:flex;align-items:center;gap:.8rem;padding-right:1.4rem;
  border-right:1px solid var(--rule-2)}
.brand em{width:0;height:0;border-left:11px solid transparent;border-right:11px solid transparent;
  border-bottom:19px solid var(--amber);display:block;flex:0 0 auto}
.brand b{font-family:var(--disp);font-weight:900;font-size:1.02rem;letter-spacing:.02em;
  text-transform:uppercase;display:block;line-height:1.1}
.brand small{font-family:var(--mono);font-size:.62rem;letter-spacing:.14em;color:var(--ink-2);
  display:block}
.nav{margin-left:auto;display:flex;gap:0;align-items:center}
.nav a{font-family:var(--mono);font-size:.74rem;letter-spacing:.06em;text-transform:uppercase;
  color:var(--ink-2);padding:0 .82rem;line-height:72px}
.nav a:hover{color:var(--ink);background:#DFDCD5;text-decoration:none}
.nav a[aria-current]{color:var(--ink);background:var(--amber)}
.btn{display:inline-block;font-family:var(--mono);font-size:.75rem;letter-spacing:.12em;
  text-transform:uppercase;font-weight:600;padding:.78rem 1.3rem;border:2px solid var(--ink);
  color:var(--ink);background:transparent;cursor:pointer;transition:.15s}
.btn:hover{background:var(--ink);color:var(--paper);text-decoration:none}
.btn--solid{background:var(--amber);border-color:var(--amber)}
.btn--solid:hover{background:var(--ink);border-color:var(--ink);color:var(--amber)}
.nav .btn{line-height:normal;margin-left:.8rem}
.burger{display:none;margin-left:auto;background:none;border:2px solid var(--ink);
  color:var(--ink);width:46px;height:42px;font-size:1.1rem;cursor:pointer;align-self:center}

/* hero + title block */
.hero{padding:4.4rem 0 0}
.eyebrow{font-family:var(--mono);font-size:.72rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--blue);border-left:4px solid var(--amber);padding-left:.8rem;margin-bottom:1.6rem}
.hero h1{font-size:clamp(2.4rem,6.2vw,4.6rem);text-transform:uppercase;max-width:15ch;
  letter-spacing:-.035em}
.hero h1 span{color:var(--blue)}
.hero .lede{font-size:1.1rem;color:var(--ink-2);max-width:58ch;margin-top:1.4rem}
.cta{display:flex;gap:.8rem;flex-wrap:wrap;margin-top:2rem}

/* the title block — signature element */
.titleblock{margin-top:3rem;border:2px solid var(--ink);background:var(--paper-2)}
.titleblock__head{background:var(--ink);color:var(--paper);display:flex;justify-content:space-between;
  gap:1rem;padding:.55rem 1rem;font-family:var(--mono);font-size:.7rem;letter-spacing:.18em;
  text-transform:uppercase;flex-wrap:wrap}
.titleblock__head span:last-child{color:var(--amber)}
.tb__grid{display:grid;grid-template-columns:repeat(4,1fr)}
.tb__cell{padding:1.4rem 1.1rem;border-right:1px solid var(--rule-2)}
.tb__cell:last-child{border-right:0}
.tb__cell dt{font-family:var(--mono);font-size:.62rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--ink-2);margin-bottom:.45rem}
.tb__cell dd{margin:0;font-family:var(--disp);font-weight:900;font-size:1.8rem;line-height:1;
  letter-spacing:-.03em}
.tb__cell small{display:block;font-size:.75rem;color:var(--ink-2);margin-top:.5rem;line-height:1.5}
@media(max-width:820px){.tb__grid{grid-template-columns:1fr 1fr}
  .tb__cell:nth-child(2n){border-right:0}
  .tb__cell{border-bottom:1px solid var(--rule-2)}}

/* sections */
.sec{padding:4.2rem 0;border-top:1px solid var(--rule-2)}
.sec--dark{background:var(--ink);color:#CFD3D8;border-top:0}
.sec--dark h2,.sec--dark h3{color:#fff}
.sec--dark .sub,.sec--dark p{color:#AEB4BC}
.sec--dark .sheetno{color:var(--amber);border-color:#2C333A}
.sec--blue{background:var(--blue);color:#D6E3EE;border-top:0}
.sec--blue h2,.sec--blue h3{color:#fff}
.sec--blue p,.sec--blue .sub{color:#BDD1E0}
.sec--blue .sheetno{color:var(--amber);border-color:#1E4E76}

.sheetno{display:flex;align-items:center;gap:.9rem;font-family:var(--mono);font-size:.7rem;
  letter-spacing:.2em;text-transform:uppercase;color:var(--ink-2);border-bottom:1px solid var(--rule-2);
  padding-bottom:.7rem;margin-bottom:2rem}
.sheetno b{background:var(--amber);color:var(--ink);padding:.24rem .55rem;font-weight:700}
h2.big{font-size:clamp(1.8rem,4.2vw,3rem);text-transform:uppercase;max-width:20ch;
  margin-bottom:1rem;letter-spacing:-.03em}
.sub{color:var(--ink-2);max-width:66ch;font-size:1.02rem}

.cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(258px,1fr));gap:1.2rem;margin-top:2.2rem}
.card{border:1px solid var(--ink);background:var(--paper-2);padding:1.5rem 1.4rem}
.sec--dark .card,.sec--blue .card{background:transparent;border-color:#39414A}
.sec--blue .card{border-color:#22557E}
.card h3{font-size:1.08rem;text-transform:uppercase;margin-bottom:.6rem;letter-spacing:-.01em}
.card p{font-size:.93rem;color:var(--ink-2);margin-bottom:0}
.sec--dark .card p,.sec--blue .card p{color:#AEB4BC}
.card .tag{display:block;font-family:var(--mono);font-size:.64rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--blue);margin-bottom:.8rem}
.sec--dark .card .tag,.sec--blue .card .tag{color:var(--amber)}

.split{display:grid;grid-template-columns:1.12fr .88fr;gap:3rem;align-items:start}
@media(max-width:900px){.split{grid-template-columns:1fr;gap:2rem}}

/* spec rows */
.rows{margin-top:2rem;border-top:2px solid var(--ink)}
.row{display:grid;grid-template-columns:130px 1fr;gap:1.5rem;padding:1.5rem 0;
  border-bottom:1px solid var(--rule-2)}
.row__k{font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--blue);font-weight:600}
.sec--dark .row__k,.sec--blue .row__k{color:var(--amber)}
.row h3{font-size:1.2rem;text-transform:uppercase;margin-bottom:.5rem}
.row p{font-size:.95rem;color:var(--ink-2);margin-bottom:.6rem}
.sec--dark .row{border-color:#2C333A}
.row ul{margin:.4rem 0 0;padding-left:1.15rem;color:var(--ink-2);font-size:.92rem}
.sec--dark .row ul{color:#AEB4BC}
.row ul li{margin-bottom:.33rem}
@media(max-width:640px){.row{grid-template-columns:1fr;gap:.5rem}}

/* tables */
.tblwrap{overflow-x:auto;margin-top:1.8rem;border:2px solid var(--ink);background:var(--paper-2)}
.tbl{width:100%;border-collapse:collapse;font-size:.91rem}
.tbl caption{text-align:left;padding:.9rem 1.1rem;font-family:var(--mono);font-size:.66rem;
  letter-spacing:.16em;text-transform:uppercase;background:var(--ink);color:var(--amber)}
.tbl th,.tbl td{padding:.78rem 1.05rem;text-align:left;vertical-align:top;
  border-bottom:1px solid var(--rule);border-right:1px solid var(--rule)}
.tbl th:last-child,.tbl td:last-child{border-right:0}
.tbl thead th{font-family:var(--mono);font-size:.64rem;letter-spacing:.12em;text-transform:uppercase;
  color:var(--ink);background:#DCD9D1;font-weight:600}
.tbl td.num,.tbl th.num{text-align:right;font-family:var(--mono);white-space:nowrap}
.tbl tfoot td{background:var(--amber);font-weight:700;font-family:var(--mono)}
.tbl tbody tr:last-child td{border-bottom:0}
.tbl tbody tr:hover{background:#E4E1D9}

/* lists */
.ticks,.crosses{list-style:none;padding:0;margin:1.3rem 0 0}
.ticks li,.crosses li{position:relative;padding-left:2.1rem;margin-bottom:.82rem;
  color:var(--ink-2);font-size:.96rem}
.sec--dark .ticks li,.sec--dark .crosses li{color:#B9BFC6}
.ticks li::before{content:'';position:absolute;left:0;top:.42em;width:14px;height:14px;
  border:2px solid var(--green);background:var(--green)}
.crosses li::before{content:'';position:absolute;left:0;top:.42em;width:14px;height:14px;
  border:2px solid var(--red)}
.crosses li::after{content:'';position:absolute;left:1px;top:.5em;width:14px;height:2px;
  background:var(--red);transform:rotate(-45deg)}

.plain{border:2px solid var(--red);background:#F6E9E6;padding:1.8rem 1.7rem;margin-top:2.2rem}
.sec--dark .plain{background:#241A19}
.plain h3{color:var(--red);font-size:1.2rem;text-transform:uppercase;margin-bottom:.8rem}
.plain p{color:#5A3630;font-size:.96rem}
.sec--dark .plain p{color:#C9AFA9}
.plain p:last-child{margin-bottom:0}
.note{border-left:4px solid var(--blue);background:#DFDCD5;padding:.95rem 1.15rem;
  color:var(--ink-2);font-size:.92rem;margin:1.5rem 0}
.sec--dark .note{background:#1D2227;border-color:var(--amber);color:#AEB4BC}
.sec--blue .note{background:#0D2C46;border-color:var(--amber);color:#BDD1E0}

/* calculator */
.calc{display:grid;grid-template-columns:1fr 1fr;gap:2rem;border:2px solid var(--ink);
  background:var(--paper-2);padding:1.9rem;margin-top:2.2rem}
@media(max-width:820px){.calc{grid-template-columns:1fr;gap:1.4rem}}
.calc label{display:block;font-family:var(--mono);font-size:.66rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--ink-2);margin:1rem 0 .4rem}
.calc input{width:100%;background:#fff;border:2px solid var(--rule-2);color:var(--ink);
  padding:.68rem .85rem;font-family:var(--mono);font-size:1rem}
.calc input:focus{border-color:var(--blue);outline:none}
.calcout{border-top:1px solid var(--rule-2);padding-top:.82rem;margin-top:.82rem;display:flex;
  justify-content:space-between;gap:1rem;align-items:baseline}
.calcout span:first-child{font-size:.88rem;color:var(--ink-2)}
.calcout span:last-child{font-family:var(--mono);font-size:1.12rem;font-weight:600}
.calcout--big span:last-child{font-family:var(--disp);font-weight:900;font-size:1.7rem;color:var(--blue)}
.calcout span.is-neg{color:var(--red)}

/* faq */
.acc{margin-top:2rem;border-top:2px solid var(--ink)}
.acc>div{border-bottom:1px solid var(--rule-2)}
.acc button{width:100%;background:none;border:0;color:var(--ink);text-align:left;
  padding:1.2rem 2.6rem 1.2rem 0;font-family:var(--disp);font-weight:700;font-size:1.05rem;
  cursor:pointer;position:relative;line-height:1.3;text-transform:uppercase;letter-spacing:-.01em}
.acc button::after{content:'+';position:absolute;right:.2rem;top:1rem;color:var(--blue);
  font-family:var(--mono);font-size:1.3rem}
.acc .is-open button::after{content:'−'}
.acc .panel{display:none;padding:0 0 1.3rem;color:var(--ink-2);font-size:.96rem;max-width:80ch}
.acc .is-open .panel{display:block}

/* form */
.form{display:grid;grid-template-columns:1fr 1fr;gap:1.1rem 1.5rem;margin-top:2rem;
  border:2px solid var(--ink);background:var(--paper-2);padding:1.9rem}
.form .full{grid-column:1/-1}
@media(max-width:760px){.form{grid-template-columns:1fr;padding:1.3rem}}
.form label{display:block;font-family:var(--mono);font-size:.66rem;letter-spacing:.13em;
  text-transform:uppercase;color:var(--ink-2);margin-bottom:.4rem}
.form input,.form select,.form textarea{width:100%;background:#fff;border:2px solid var(--rule-2);
  color:var(--ink);padding:.72rem .85rem;font-family:var(--sans);font-size:.97rem}
.form textarea{min-height:118px;resize:vertical}
.form input:focus,.form select:focus,.form textarea:focus{border-color:var(--blue);outline:none}
.form .req{color:var(--red)}
.hp{position:absolute;left:-9999px}
.formerror{border:2px solid var(--red);background:#F6E9E6;padding:.85rem 1.05rem;color:#7A2E24;
  font-size:.92rem;grid-column:1/-1}

[data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .55s ease,transform .55s ease}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- hero: fill the right rail on desktop ---------- */
@media(min-width:1000px){
  .hero .shell{display:grid;grid-template-columns:1.14fr .86fr;column-gap:3.4rem}
  .hero .eyebrow{grid-column:1/-1;justify-self:start}
  .hero h1{grid-column:1;grid-row:2/4;max-width:none;font-size:clamp(2.6rem,4.8vw,4.2rem);
    align-self:start}
  .hero .lede{grid-column:2;grid-row:2;align-self:end;margin-top:0;max-width:none}
  .hero .cta{grid-column:2;grid-row:3;margin-top:1.5rem;align-self:start}
  .hero .titleblock{grid-column:1/-1;grid-row:4}
}

/* ---------- interior page headers: two columns, no empty right rail ---------- */
@media(min-width:1000px){
  main > section.sec:first-child > .shell{display:grid;grid-template-columns:1.1fr .9fr;
    column-gap:3.2rem;align-items:start}
  main > section.sec:first-child > .shell > *{grid-column:1/-1}
  main > section.sec:first-child > .shell > .eyebrow{justify-self:start}
  main > section.sec:first-child > .shell > h1{grid-column:1;max-width:none}
  main > section.sec:first-child > .shell > .sub{grid-column:2;grid-row:2;align-self:end;
    margin-top:0;max-width:none}
}

/* ---------- contrast: components own their text colour ----------
   Tables, calculators and forms sit on light paper even inside a dark or
   blue section, so they must never inherit that section's light text. */
.nav .btn,.nav .btn--solid{color:var(--ink)}
.nav .btn:hover{color:var(--paper)}
.nav .btn--solid:hover{color:var(--amber)}
.tblwrap{color:var(--ink)}
.tbl th,.tbl td{color:var(--ink-2)}
.tbl thead th{color:var(--ink)}
.tbl tbody th{color:var(--ink)}
.tbl tfoot td{color:var(--ink)}
.calc,.form,.acc{color:var(--ink)}
.calcout span:last-child{color:var(--ink)}
.sec--blue .ticks li,.sec--blue .crosses li{color:#BDD1E0}
.sec--blue .row p,.sec--blue .row ul{color:#BDD1E0}
.sec--blue .card p{color:#BDD1E0}

code{color:var(--ink)}
.sec--dark code,.sec--blue code{color:var(--ink)}

/* footer */
.foot{background:var(--ink);color:#9AA1A9;padding:3.2rem 0 2rem;font-size:.9rem}
.foot__grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:2.4rem}
@media(max-width:820px){.foot__grid{grid-template-columns:1fr;gap:1.7rem}}
.foot h4{font-family:var(--mono);font-size:.65rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--amber);margin:0 0 .9rem;font-weight:500}
.foot ul{list-style:none;padding:0;margin:0}
.foot li{margin-bottom:.46rem}
.foot a{color:#C4CAD1}
.foot code{background:#22282E;color:#C4CAD1}
.footlogo{font-family:var(--disp);font-weight:900;font-size:1.2rem;color:#fff;
  text-transform:uppercase;margin-bottom:.6rem;letter-spacing:-.02em}
.foot .disc{border-top:1px solid #2C333A;margin-top:2.3rem;padding-top:1.4rem;font-size:.77rem;
  color:#767D85;line-height:1.75}

@media(max-width:960px){
  .nav{position:fixed;inset:72px 0 auto;background:var(--paper-2);flex-direction:column;
    align-items:stretch;padding:.4rem 4vw 1.3rem;border-bottom:2px solid var(--ink);display:none}
  .nav.is-open{display:flex}
  .nav a{line-height:normal;padding:.85rem 0;border-bottom:1px solid var(--rule-2);font-size:.85rem}
  .nav .btn{margin:1rem 0 0;text-align:center}
  .burger{display:block}
  .hero{padding:2.8rem 0 0}
}