/* ============================================================================
   Capacity Reservation Agreement — Contract Generator
   Minimalist, enterprise-grade. Black & white only. Classic serif display.
   ========================================================================== */
:root{
  --ink:#000;
  --paper:#fff;
  --soft:#595959;
  --line:#bfbfbf;
  --hair:#e6e6e6;
  --fill:#f2f2f2;
  --fill2:#fafafa;
  --serif:Georgia, "Times New Roman", Times, serif;
  --sans:"Helvetica Neue", Arial, "Segoe UI", system-ui, sans-serif;
  --maxw:1180px;
  --gap:28px;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:15px;
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
}
code{font-family:var(--serif);font-size:.92em;background:var(--fill);padding:0 .28em;border:1px solid var(--hair)}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px}

/* ---- Top bar --------------------------------------------------------- */
.topbar{border-bottom:1px solid var(--ink);background:var(--paper);position:sticky;top:0;z-index:30}
.topbar__inner{display:flex;align-items:center;justify-content:space-between;height:58px}
.brand{display:flex;align-items:baseline;gap:10px}
.brand__mark{font-family:var(--serif);font-size:22px;font-weight:700;letter-spacing:.02em}
.brand__sep{width:1px;height:18px;background:var(--line);align-self:center}
.brand__sub{font-size:11px;letter-spacing:.32em;text-transform:uppercase;color:var(--soft)}
.topnav__item{font-size:11px;letter-spacing:.26em;text-transform:uppercase;color:var(--soft)}

/* ---- Hero ------------------------------------------------------------ */
.hero{border-bottom:1px solid var(--hair);padding:46px 0 36px}
.eyebrow{font-size:11px;letter-spacing:.34em;text-transform:uppercase;color:var(--soft);margin:0 0 14px}
.hero__title{font-family:var(--serif);font-weight:700;font-size:40px;line-height:1.08;letter-spacing:.01em;margin:0 0 16px}
.hero__lede{max-width:62ch;color:#1c1c1c;font-size:16px;margin:0}

/* ---- Layout ---------------------------------------------------------- */
.layout{display:grid;grid-template-columns:minmax(0,1fr) 372px;gap:var(--gap);align-items:start;padding-top:34px;padding-bottom:64px}
.panel{background:var(--paper)}
.inputs{min-width:0}

/* ---- Toolbar / tabs -------------------------------------------------- */
.toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:22px;flex-wrap:wrap}
.segmented{display:inline-flex;border:1px solid var(--ink)}
.seg{appearance:none;background:var(--paper);border:0;border-right:1px solid var(--ink);padding:9px 20px;font-family:var(--sans);font-size:12px;letter-spacing:.16em;text-transform:uppercase;cursor:pointer;color:var(--ink)}
.seg:last-child{border-right:0}
.seg.is-active{background:var(--ink);color:var(--paper)}
.toolbar__actions{display:flex;gap:10px}

/* ---- Buttons -------------------------------------------------------- */
.btn{appearance:none;font-family:var(--sans);font-size:12px;letter-spacing:.14em;text-transform:uppercase;padding:11px 18px;border:1px solid var(--ink);background:var(--paper);color:var(--ink);cursor:pointer;transition:background .12s ease,color .12s ease}
.btn:hover{background:var(--ink);color:var(--paper)}
.btn--ghost{border-color:var(--line);color:#222}
.btn--ghost:hover{background:#222;color:#fff;border-color:#222}
.btn--solid{background:var(--ink);color:var(--paper)}
.btn--solid:hover{background:#fff;color:#000}
.btn--block{display:block;width:100%;margin-top:10px}
.btn--sm{padding:7px 12px;font-size:11px}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn:disabled:hover{background:var(--paper);color:var(--ink)}
.btn--solid:disabled:hover{background:var(--ink);color:var(--paper)}

/* ---- Form ----------------------------------------------------------- */
.fieldset{border:1px solid var(--hair);border-top:2px solid var(--ink);padding:22px 22px 8px;margin:0 0 22px}
.fieldset__legend{display:flex;align-items:baseline;gap:12px;margin-bottom:4px}
.fieldset__title{font-family:var(--serif);font-size:18px;font-weight:700}
.fieldset__blurb{color:var(--soft);font-size:13px;margin:2px 0 18px;max-width:66ch}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:16px 18px}
.field{display:flex;flex-direction:column;min-width:0}
.field--full{grid-column:1 / -1}
.field label{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:#2a2a2a;margin-bottom:7px}
.field .help{font-size:12px;color:var(--soft);margin-top:6px;line-height:1.4}
.input,.textarea{font-family:var(--sans);font-size:14px;color:var(--ink);background:var(--paper);border:1px solid var(--line);padding:10px 12px;width:100%;border-radius:0}
.input:focus,.textarea:focus{outline:none;border-color:var(--ink);box-shadow:inset 0 -2px 0 0 var(--ink)}
.textarea{min-height:62px;resize:vertical;line-height:1.45}
.input--num{font-variant-numeric:tabular-nums}
.field--commercial .input{font-size:16px;font-variant-numeric:tabular-nums}
.fieldset--commercials{border-top-color:var(--ink)}
.fieldset--commercials .fieldset__title::after{content:" · drives calculations";font-family:var(--sans);font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--soft)}

/* ---- JSON view ------------------------------------------------------ */
.jsonview__bar{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:10px}
.hint{font-size:12.5px;color:var(--soft);max-width:70ch}
#jsonInput{width:100%;min-height:560px;font-family:"SF Mono",ui-monospace,Menlo,Consolas,monospace;font-size:13px;line-height:1.55;border:1px solid var(--line);padding:16px;color:var(--ink);background:var(--fill2);resize:vertical;tab-size:2}
#jsonInput:focus{outline:none;border-color:var(--ink)}
.jsonerror{color:#000;background:var(--fill);border:1px solid var(--ink);border-left-width:4px;padding:9px 12px;font-size:13px;margin:10px 0 0;display:none}
.jsonerror.show{display:block}

/* ---- Summary -------------------------------------------------------- */
.summary{position:sticky;top:80px;border:1px solid var(--ink);padding:26px 24px 24px}
.summary__head{margin-bottom:18px}
.tcv{font-family:var(--serif);font-weight:700;font-size:38px;line-height:1.04;letter-spacing:.005em;margin:8px 0 0;font-variant-numeric:tabular-nums;word-break:break-word}
.tcv__formula{font-size:11.5px;color:var(--soft);margin:8px 0 0;line-height:1.4}
.figs{margin:0;display:flex;flex-direction:column;gap:0}
.fig{display:flex;align-items:baseline;justify-content:space-between;gap:14px;padding:9px 0;border-bottom:1px solid var(--hair)}
.figs--tight .fig{padding:7px 0}
.fig:last-child{border-bottom:0}
.fig dt{color:var(--soft);font-size:12px;letter-spacing:.06em;text-transform:uppercase}
.fig dd{margin:0;font-family:var(--serif);font-size:15px;font-variant-numeric:tabular-nums;text-align:right}
.rule{height:1px;background:var(--ink);margin:16px 0}
.parties{display:flex;align-items:stretch;gap:12px;margin-bottom:12px}
.party{display:flex;flex-direction:column;gap:4px;flex:1;min-width:0}
.party__role{font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--soft)}
.party__name{font-family:var(--serif);font-size:15px;line-height:1.2;word-break:break-word}
.party__arrow{align-self:center;color:var(--line);font-size:18px}
.facility-line{font-size:12.5px;color:var(--soft);margin:0 0 18px}
.facility-line span{color:var(--ink)}
.fineprint{font-size:11.5px;color:var(--soft);margin:14px 0 0;line-height:1.45}
.errbox{display:block;background:#000;color:#fff;font-size:12.5px;line-height:1.45;padding:10px 12px;margin:0 0 14px;white-space:pre-line}
.summary.is-invalid .tcv,.summary.is-invalid .fig dd{opacity:.4}

/* ---- Footer / toast ------------------------------------------------- */
.foot{border-top:1px solid var(--hair);margin-top:10px}
.foot__inner{display:flex;justify-content:space-between;align-items:center;height:56px;font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--soft)}
.foot__dim{color:var(--line)}
.toast{position:fixed;left:50%;bottom:28px;transform:translateX(-50%) translateY(12px);background:var(--ink);color:var(--paper);padding:12px 20px;font-size:13px;letter-spacing:.04em;opacity:0;transition:opacity .18s ease,transform .18s ease;z-index:50;max-width:90vw}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---- Responsive ----------------------------------------------------- */
@media (max-width:920px){
  .layout{grid-template-columns:1fr}
  .summary{position:static;order:-1}
  .hero__title{font-size:32px}
}
@media (max-width:560px){
  .wrap{padding:0 18px}
  .grid{grid-template-columns:1fr}
  .toolbar{align-items:flex-start}
  .hero{padding:32px 0 26px}
  .hero__title{font-size:27px}
  .tcv{font-size:32px}
}