/* ============================================================
   CHARGEABLE AREA — chargeablearea.com
   Visual language borrowed from measured drawings:
   a title block, poché hatching by space class, dimension lines.
   ============================================================ */

:root{
  --paper:#FBFBF9;
  --ink:#17191B;
  --ink-2:#5A6169;
  --ink-3:#8B9196;
  --rule:#DCDED8;
  --rule-2:#EDEEE9;

  /* space classes, taken from stack-plan convention */
  --assigned:#2E4A6B;
  --common:#6E8B5E;
  --service:#9A958A;
  --oxblood:#8C2F26;   /* revision marks, dates, warnings only */

  --wash:#F1F2ED;

  --display:"IBM Plex Sans Condensed","DejaVu Sans Condensed","Archivo Narrow",sans-serif;
  --body:"IBM Plex Serif","Bitstream Charter","DejaVu Serif",Georgia,serif;
  --mono:"IBM Plex Mono","DejaVu Sans Mono",ui-monospace,monospace;

  --w:1120px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  background:var(--paper);color:var(--ink);
  font-family:var(--body);font-size:16px;line-height:1.62;
  -webkit-font-smoothing:antialiased;
}
.wrap{max-width:var(--w);margin:0 auto;padding:0 32px}

/* ---------- utility type ---------- */
.lbl{
  font-family:var(--mono);font-size:10px;letter-spacing:.20em;
  text-transform:uppercase;color:var(--ink-3);
}
.num{font-family:var(--mono);font-variant-numeric:tabular-nums}
a{color:var(--assigned)}
a:focus-visible,button:focus-visible,input:focus-visible{
  outline:2px solid var(--assigned);outline-offset:2px
}

/* ---------- masthead ---------- */
header{border-bottom:1px solid var(--ink)}
.mast{display:flex;align-items:baseline;justify-content:space-between;padding:18px 0 14px;gap:24px;flex-wrap:wrap}
.mark{font-family:var(--display);font-size:19px;font-weight:600;letter-spacing:.06em;text-transform:uppercase}
.mark span{color:var(--ink-3);font-weight:400}
nav{display:flex;gap:26px;flex-wrap:wrap}
nav a{
  font-family:var(--display);font-size:14px;letter-spacing:.02em;
  color:var(--ink-2);text-decoration:none;padding-bottom:2px
}
nav a:hover{color:var(--ink)}
nav a[aria-current]{color:var(--ink);box-shadow:0 2px 0 var(--oxblood)}

/* ---------- title block (signature device) ---------- */
.titleblock{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));
  border:1px solid var(--ink);background:#fff;margin:26px 0 0
}
.tb{padding:8px 14px;border-right:1px solid var(--rule)}
.tb:last-child{border-right:0}
.tb .k{display:block;font-family:var(--mono);font-size:9.5px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--ink-3)}
.tb .v{font-family:var(--display);font-size:13.5px;margin-top:1px;display:block}
.tb .v.rev{color:var(--oxblood)}

/* ---------- page furniture ---------- */
main{padding-bottom:72px}
.eyebrow{margin:44px 0 10px}
h1{
  font-family:var(--display);font-weight:600;font-size:clamp(30px,4.4vw,46px);
  line-height:1.08;letter-spacing:-.012em;max-width:19ch
}
h2{
  font-family:var(--display);font-weight:600;font-size:22px;letter-spacing:-.005em;
  margin:0 0 10px
}
h3{font-family:var(--display);font-weight:600;font-size:15px;margin:0 0 4px}
.lede{font-size:18px;color:var(--ink-2);max-width:62ch;margin-top:16px}
p{margin-bottom:12px;max-width:68ch}
section{padding:38px 0;border-top:1px solid var(--rule)}
section.first{border-top:0}
.small{font-size:13.5px;color:var(--ink-2)}
.mut{color:var(--ink-3)}

/* ---------- floor plate: the signature ---------- */
.plate{border:1px solid var(--ink);background:#fff;padding:0;margin:30px 0 0}
.plate-row{display:flex;height:104px;border-bottom:1px solid var(--rule)}
.plate-row:last-child{border-bottom:0}
.zone{
  position:relative;border-right:1px solid var(--rule);
  display:flex;align-items:flex-end;padding:9px 11px;overflow:hidden
}
.zone:last-child{border-right:0}
.zone .zl{
  position:relative;z-index:2;font-family:var(--display);font-size:12px;line-height:1.25
}
.zone .zl b{display:block;font-weight:600}
.zone .zl span{color:var(--ink-2);font-size:11px}
.z-assigned{background:rgba(46,74,107,.13)}
.z-common{
  background-image:repeating-linear-gradient(45deg,
    rgba(110,139,94,.42) 0 1.5px, transparent 1.5px 8px)
}
.z-service{
  background-image:
    repeating-linear-gradient(45deg, rgba(154,149,138,.5) 0 1.5px, transparent 1.5px 7px),
    repeating-linear-gradient(-45deg, rgba(154,149,138,.5) 0 1.5px, transparent 1.5px 7px)
}
.z-vacant{background:#fff}
.z-vacant::after{
  content:"";position:absolute;inset:7px;border:1px dashed var(--ink-3);z-index:1
}
.floor-tag{
  font-family:var(--mono);font-size:10px;letter-spacing:.16em;color:var(--ink-3);
  writing-mode:vertical-rl;transform:rotate(180deg);
  display:flex;align-items:center;justify-content:center;
  width:30px;border-right:1px solid var(--rule);background:var(--wash);flex:none
}

/* dimension line under the plate */
.dim{display:flex;align-items:center;gap:9px;margin-top:9px;color:var(--ink-3)}
.dim::before,.dim::after{content:"";height:1px;background:var(--ink-3);flex:1;opacity:.55}
.dim span{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em}

/* key */
.key{display:flex;gap:22px;flex-wrap:wrap;margin-top:14px}
.key i{width:26px;height:12px;display:inline-block;border:1px solid var(--rule);vertical-align:-1px;margin-right:7px}
.key span{font-size:12.5px;color:var(--ink-2);font-family:var(--display)}

/* ---------- register (index list, drawing-register style) ---------- */
.register{border-top:1px solid var(--ink)}
.reg-row{
  display:grid;grid-template-columns:52px 1fr 1.35fr auto;gap:18px;align-items:baseline;
  padding:15px 0;border-bottom:1px solid var(--rule);text-decoration:none;color:inherit
}
.reg-row:hover{background:var(--wash)}
.reg-row .no{font-family:var(--mono);font-size:11px;color:var(--ink-3);letter-spacing:.1em}
.reg-row .ti{font-family:var(--display);font-size:17px;font-weight:600}
.reg-row .de{font-size:14px;color:var(--ink-2)}
.reg-row .go{font-family:var(--mono);font-size:11px;color:var(--assigned);letter-spacing:.1em}

/* ---------- calculator ---------- */
.calc{display:grid;grid-template-columns:1fr 1px 1fr;border:1px solid var(--ink);background:#fff;margin-top:26px}
.calc .div{background:var(--rule-2)}
.pane{padding:24px 26px}
.grp{margin-bottom:16px}
.grp:last-child{margin-bottom:0}
label{display:block;font-family:var(--display);font-size:13px;color:var(--ink-2);margin-bottom:5px}
.field{display:flex;align-items:stretch;border:1px solid var(--rule);background:var(--paper)}
.field input{
  flex:1;min-width:0;border:0;background:transparent;padding:9px 11px;
  font-family:var(--mono);font-size:15px;color:var(--ink);font-variant-numeric:tabular-nums
}
.field .unit{
  padding:9px 11px;border-left:1px solid var(--rule);background:var(--wash);
  font-family:var(--display);font-size:12px;color:var(--ink-2);white-space:nowrap
}
.seg{display:flex;border:1px solid var(--rule);width:fit-content}
.seg button{
  font-family:var(--display);font-size:12.5px;padding:7px 15px;border:0;
  border-right:1px solid var(--rule);background:var(--paper);color:var(--ink-2);cursor:pointer
}
.seg button:last-child{border-right:0}
.seg button[aria-pressed="true"]{background:var(--assigned);color:#fff}

.rows{border-top:1px solid var(--rule-2);margin-top:4px}
.crow{display:flex;justify-content:space-between;align-items:center;
  padding:6px 0;border-bottom:1px solid var(--rule-2);gap:12px}
.crow label{margin:0;font-size:13.5px;flex:1}
.crow .field{width:132px;flex:none}
.crow .field input{padding:5px 9px;font-size:13.5px;text-align:right}
.crow .field .unit{padding:5px 9px;font-size:11px}

.big{
  font-family:var(--mono);font-size:clamp(38px,6vw,54px);line-height:1;
  letter-spacing:-.03em;color:var(--assigned);text-align:center;padding:12px 0 4px;
  font-variant-numeric:tabular-nums
}
.bigsub{text-align:center;font-family:var(--display);font-size:13px;color:var(--ink-2);padding-bottom:12px}
.bar{display:flex;height:11px;margin:20px 0 9px;border:1px solid var(--rule)}
.bar i{display:block;height:100%}
.legend{display:flex;flex-wrap:wrap;gap:5px 16px;font-size:11.5px;color:var(--ink-2);font-family:var(--display)}
.legend em{font-style:normal;display:inline-block;width:9px;height:9px;margin-right:6px}
.secondary{display:flex;gap:8px;border-top:1px solid var(--rule-2);margin-top:20px;padding-top:16px}
.sec{flex:1}
.sec .v{font-family:var(--mono);font-size:21px;font-variant-numeric:tabular-nums}
.sec .k{font-family:var(--display);font-size:12px;color:var(--ink-2);margin-top:1px}

.verdict{
  display:flex;gap:9px;align-items:baseline;margin-top:14px;
  font-size:13.5px;color:var(--ink-2);border-left:2px solid var(--oxblood);padding-left:12px
}

/* ---------- tables ---------- */
table{width:100%;border-collapse:collapse;font-size:14px;background:#fff;border:1px solid var(--rule);margin:16px 0}
thead th{
  font-family:var(--mono);font-size:9.5px;letter-spacing:.15em;text-transform:uppercase;
  color:#fff;background:var(--ink);text-align:left;padding:9px 13px;font-weight:400
}
th.r,td.r{text-align:right}
tbody td{padding:10px 13px;border-bottom:1px solid var(--rule-2);vertical-align:top}
tbody tr:last-child td{border-bottom:0}
tbody tr.hi td{background:#FBF8F1}
td.mono{font-family:var(--mono);font-variant-numeric:tabular-nums}
td .sub{display:block;font-size:12px;color:var(--ink-3);margin-top:2px}
.flag{font-family:var(--display);font-size:11.5px;color:var(--oxblood)}

/* ---------- method / notes ---------- */
.method{border-left:2px solid var(--ink);padding:2px 0 2px 18px;max-width:74ch}
.method p{font-size:14.5px;color:var(--ink-2)}
.method b{color:var(--ink)}
.srcs{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:18px;margin-top:16px}
.src{font-size:12.5px;color:var(--ink-2)}
.src b{display:block;color:var(--ink);font-family:var(--display);font-size:13px}
.note{background:var(--wash);padding:14px 16px;font-size:13.5px;color:var(--ink-2);margin:16px 0;max-width:78ch}
.note b{color:var(--ink)}

/* ---------- product block ---------- */
.buy{border:1px solid var(--ink);background:#fff;display:grid;grid-template-columns:1.6fr 1fr;margin-top:22px}
.buy .l{padding:26px 28px;border-right:1px solid var(--rule)}
.buy .r{padding:26px 28px;display:flex;flex-direction:column;justify-content:center;gap:12px;background:var(--wash)}
.price{font-family:var(--mono);font-size:33px;letter-spacing:-.02em}
.price small{font-family:var(--display);font-size:12.5px;color:var(--ink-2);display:block;letter-spacing:0}
.btn{
  display:inline-block;background:var(--assigned);color:#fff;text-decoration:none;
  font-family:var(--display);font-size:14.5px;padding:11px 20px;text-align:center
}
.btn.ghost{background:transparent;color:var(--assigned);border:1px solid var(--assigned)}
ul.tick{list-style:none;margin:10px 0 0}
ul.tick li{font-size:14px;padding-left:18px;position:relative;margin-bottom:5px;color:var(--ink-2)}
ul.tick li::before{content:"";position:absolute;left:0;top:9px;width:8px;height:1px;background:var(--assigned)}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--ink);padding:22px 0 46px;font-size:12.5px;color:var(--ink-2)}
.foot{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap}

@media (max-width:820px){
  .calc{grid-template-columns:1fr}
  .calc .div{height:1px}
  .buy{grid-template-columns:1fr}
  .buy .l{border-right:0;border-bottom:1px solid var(--rule)}
  .reg-row{grid-template-columns:38px 1fr;row-gap:4px}
  .reg-row .de{grid-column:2}
  .reg-row .go{display:none}
  .plate-row{height:auto;min-height:78px}
}
@media (prefers-reduced-motion:no-preference){
  .zone{animation:fill .5s ease-out both}
  .plate-row:nth-child(1) .zone{animation-delay:.05s}
  .plate-row:nth-child(2) .zone{animation-delay:.14s}
  .plate-row:nth-child(3) .zone{animation-delay:.23s}
  @keyframes fill{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
}