/* ==========================================================================
   HISA — Design System
   Single source of truth for the HISA visual language.
   Tokens below are PRESERVED VERBATIM from the approved HISA Systems project.
   Change a token here and it updates across every page.
   ========================================================================== */

:root{
  /* --- Approved palette (unchanged) --- */
  --ink:#17181B;
  --deep:#0E0F11;
  --paper:#F3F1EA;
  --cloud:#FAF9F5;
  --mist:#EBE8E0;
  --steel:#5C6771;
  --ember:#C15A31;

  --line:rgba(23,24,27,.12);
  --line2:rgba(23,24,27,.07);

  /* --- Approved typography --- */
  --sans:'Archivo',system-ui,-apple-system,'Segoe UI',sans-serif;
  --mono:'IBM Plex Mono',ui-monospace,'SF Mono',Menlo,monospace;

  /* --- Approved rhythm --- */
  --mx:clamp(22px,6vw,130px);          /* page gutter */
  --section-y:clamp(80px,10vw,150px);  /* section vertical padding */
  --maxw:1280px;
  --space:8px;                          /* 8px base spacing scale */

  /* --- Brand geometry (measured from the logo) --- */
  --brand-angle:-30deg;                 /* the // device leans ~30deg off vertical */
  --radius:10px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

body{
  font-family:var(--sans);
  background:#fff;
  color:var(--ink);
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg,video{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
::selection{background:var(--ember);color:#fff}

/* --- Accessibility: visible focus, skip link --- */
:focus-visible{outline:2px solid var(--ember);outline-offset:3px;border-radius:2px}
.skip{
  position:absolute;left:-9999px;top:0;z-index:200;
  background:var(--ink);color:#fff;padding:12px 18px;border-radius:0 0 4px 0;
  font-family:var(--mono);font-size:13px;
}
.skip:focus{left:0}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ==========================================================================
   Layout
   ========================================================================== */
.section{padding:var(--section-y) var(--mx);position:relative}
.section--tight{padding-block:clamp(56px,7vw,104px)}
.wrap{max-width:var(--maxw);margin:0 auto;width:100%}
.wrap--narrow{max-width:900px}

.bg-cloud{background:var(--cloud)}
.bg-paper{background:var(--paper)}
.bg-ink{background:var(--ink);color:var(--paper)}
.bg-ink .body,.bg-ink p{color:rgba(243,241,234,.82)}
.bg-ink .muted{color:rgba(243,241,234,.55)}

.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,5vw,80px);align-items:center}
.grid-2--top{align-items:start}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
@media(max-width:900px){.grid-2{grid-template-columns:1fr;gap:32px}.grid-4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:820px){.grid-3{grid-template-columns:1fr}}
@media(max-width:560px){.grid-4{grid-template-columns:1fr}}

/* ==========================================================================
   Typography — approved scale
   ========================================================================== */
h1,h2,h3,h4{font-weight:800;letter-spacing:-.02em;line-height:1.05;text-wrap:balance}
.h-xl{font-size:clamp(44px,8.4vw,116px);font-weight:900;line-height:.92;letter-spacing:-.038em}
.h-lg{font-size:clamp(32px,5.2vw,68px);font-weight:800;line-height:.99;letter-spacing:-.03em}
.h-md{font-size:clamp(23px,2.8vw,38px);font-weight:700;line-height:1.06;letter-spacing:-.02em}
.h-sm{font-size:clamp(19px,1.6vw,22px);font-weight:700;letter-spacing:-.01em}

.lead{font-size:clamp(18px,2vw,25px);line-height:1.45;font-weight:400;color:var(--steel)}
.body{font-size:17.5px;line-height:1.64;color:#2c2e33;max-width:60ch}
.muted{color:var(--steel)}
.mono{font-family:var(--mono)}
.em{color:var(--ember)}

/* Eyebrow — mono, tracked, ember, with the short rule */
.ey{
  font-family:var(--mono);font-size:12px;letter-spacing:.24em;text-transform:uppercase;
  color:var(--ember);display:flex;align-items:center;gap:14px;margin-bottom:28px;
}
.ey::before{content:"";width:26px;height:1px;background:currentColor;opacity:.6;flex:none}
.ey--center{justify-content:center}

/* Section label with index */
.sectlabel{
  display:flex;justify-content:space-between;align-items:baseline;gap:10px;flex-wrap:wrap;
  border-top:1px solid var(--line);padding-top:22px;margin-bottom:clamp(36px,5vw,54px);
}
.sectlabel .ey{margin:0}
.idx{font-family:var(--mono);font-size:12px;letter-spacing:.2em;color:var(--steel)}

/* ==========================================================================
   The // brand device (two bars — matches the logo exactly)
   ========================================================================== */
.slash{display:inline-flex;gap:.14em;transform:skewX(var(--brand-angle));flex:none}
.slash i{display:block;width:.13em;height:1em;background:currentColor}
.watermark{
  position:absolute;line-height:1;pointer-events:none;
  color:rgba(23,24,27,.04);font-size:min(34vh,260px);
}
.bg-ink .watermark{color:rgba(243,241,234,.05)}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;
  padding:15px 22px;border-radius:4px;min-height:48px;   /* 48px = comfortable tap target */
  transition:background .2s,color .2s,transform .2s,border-color .2s;
}
.btn .ar{color:var(--ember);transition:transform .2s}
.btn:hover .ar{transform:translateX(3px)}
.btn--primary{background:var(--ink);color:#fff}
.btn--primary:hover{background:#000}
.btn--ghost{border:1px solid var(--line);color:var(--ink)}
.btn--ghost:hover{border-color:var(--ink)}
.bg-ink .btn--ghost{border-color:rgba(243,241,234,.28);color:var(--paper)}
.btn--light{background:var(--paper);color:var(--ink)}

.btn-row{display:flex;flex-wrap:wrap;gap:12px;align-items:center}

/* ==========================================================================
   Header / navigation
   ========================================================================== */
.progress{position:fixed;top:0;left:0;height:2px;width:0;background:var(--ember);z-index:120;transition:width .1s linear}

.header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:15px var(--mx);
  background:rgba(255,255,255,.86);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line2);
  transition:transform .35s ease;
}
.header[data-hidden="true"]{transform:translateY(-100%)}
.header__logo{height:16px;width:auto}
.header__nav{display:flex;align-items:center;gap:22px}
.header__nav a{
  font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--steel);transition:color .2s;padding:6px 0;
}
.header__nav a:hover,.header__nav a[aria-current="page"]{color:var(--ember)}
.header__cta{display:inline-flex}
.header__burger{display:none;width:48px;height:48px;align-items:center;justify-content:center;margin-right:-12px}
.header__burger span{display:block;width:22px;height:1.5px;background:var(--ink);position:relative}
.header__burger span::before,.header__burger span::after{
  content:"";position:absolute;left:0;width:22px;height:1.5px;background:var(--ink);
}
.header__burger span::before{top:-7px}
.header__burger span::after{top:7px}

@media(max-width:1100px){
  .header__nav,.header__cta{display:none}
  .header__burger{display:flex}
}

/* Mobile drawer — deliberately designed, not a squeezed desktop menu */
.drawer{
  position:fixed;inset:0;z-index:110;background:var(--paper);
  display:flex;flex-direction:column;padding:20px var(--mx) 32px;
  transform:translateY(-100%);transition:transform .4s cubic-bezier(.2,.7,.2,1);
  overflow-y:auto;visibility:hidden;
}
.drawer[data-open="true"]{transform:none;visibility:visible}
.drawer__top{display:flex;align-items:center;justify-content:space-between;margin-bottom:28px}
.drawer__close{width:48px;height:48px;display:flex;align-items:center;justify-content:center;font-size:26px;margin-right:-12px}
.drawer__links{display:flex;flex-direction:column}
.drawer__links a{
  font-size:clamp(24px,7vw,34px);font-weight:800;letter-spacing:-.02em;
  padding:16px 0;border-bottom:1px solid var(--line);min-height:56px;display:flex;align-items:center;
}
.drawer__links a:active{color:var(--ember)}
.drawer__cta{margin-top:28px}
.drawer__meta{margin-top:auto;padding-top:32px;font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--steel);display:flex;flex-direction:column;gap:8px}
@media(prefers-reduced-motion:reduce){.drawer{transition:none}}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero{padding-top:clamp(120px,16vh,180px);padding-bottom:0;overflow:hidden}
.hero__head{max-width:20ch}
.hero .h-xl span{display:block}
.hero__standfirst{margin-top:26px;max-width:34ch}
.hero__actions{margin-top:34px}
.hero__figure{margin-top:clamp(36px,6vw,64px);border-radius:12px;overflow:hidden;position:relative}
.hero__figure img{width:100%}
.hero__meta{
  display:flex;flex-wrap:wrap;gap:10px 34px;margin-top:22px;
  font-family:var(--mono);font-size:11px;letter-spacing:.13em;text-transform:uppercase;color:var(--steel);
}

/* ==========================================================================
   Product / brand-line section (reusable: Heat, FLUX, Hot Water, Energy)
   ========================================================================== */
.pillar{padding:var(--section-y) var(--mx);position:relative}
.pillar__inner{max-width:var(--maxw);margin:0 auto;display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,5vw,72px);align-items:center}
.pillar--reverse .pillar__figure{order:-1}
@media(max-width:900px){
  .pillar__inner{grid-template-columns:1fr;gap:30px}
  .pillar--reverse .pillar__figure{order:0}
}
.pillar__figure{border-radius:12px;overflow:hidden;background:#fff}
.pillar__figure img{width:100%}
.pillar__body{margin-top:18px}
.pillar__actions{margin-top:28px}
.pillar__tag{
  display:inline-flex;align-items:center;gap:8px;margin-bottom:16px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--ember);border:1px solid rgba(193,90,49,.4);border-radius:100px;padding:6px 12px;
}

/* Headline figures — the credibility row */
.figures{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin-top:36px}
.figures>div{background:#fff;padding:24px 20px}
.bg-cloud .figures>div{background:var(--cloud)}
.figures .v{font-size:clamp(28px,3.4vw,44px);font-weight:900;letter-spacing:-.03em;line-height:1}
.figures .v small{font-size:.42em;font-weight:600;margin-left:2px}
.figures .l{font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--steel);margin-top:10px;line-height:1.35}
@media(max-width:820px){.figures{grid-template-columns:repeat(2,1fr)}}

/* Chip list */
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
.chips span{
  font-family:var(--mono);font-size:11px;letter-spacing:.06em;text-transform:uppercase;
  border:1px solid var(--line);border-radius:100px;padding:8px 14px;color:var(--ink);
}

/* Ecosystem list */
.eco{display:flex;flex-wrap:wrap;gap:10px;margin-top:32px}
.eco span{
  font-size:clamp(16px,2vw,22px);font-weight:700;letter-spacing:-.01em;
  border:1px solid rgba(243,241,234,.22);border-radius:100px;padding:12px 24px;
}

/* Feature cards */
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:36px}
@media(max-width:900px){.cards{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.cards{grid-template-columns:1fr}}
.card{border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;background:#fff}
.bg-ink .card{background:rgba(243,241,234,.04);border-color:rgba(243,241,234,.16)}
.card h3{font-size:19px;font-weight:700;margin-bottom:8px}
.card p{font-size:15px;line-height:1.55;color:var(--steel)}
.card .n{font-family:var(--mono);font-size:11px;color:var(--ember);margin-bottom:12px;letter-spacing:.12em}

/* Collaboration band */
.collab{text-align:center}
.collab h2{max-width:28ch;margin:0 auto}

/* Placeholder block — used where real assets or verified data are pending */
.placeholder{
  border:1px dashed rgba(23,24,27,.28);border-radius:var(--radius);
  padding:clamp(28px,5vw,56px);text-align:center;background:var(--cloud);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;min-height:260px;
}
.placeholder .t{font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--ember)}
.placeholder .d{font-size:15px;color:var(--steel);max-width:38ch}

/* ==========================================================================
   Technical tables — adapt to phones instead of scrolling sideways
   ========================================================================== */
.tablewrap{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
table.spec{border-collapse:collapse;width:100%}
table.spec th,table.spec td{text-align:left;padding:15px 18px;border-bottom:1px solid var(--line2);font-size:14px}
table.spec thead th{font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--steel);background:var(--cloud)}
table.spec tbody th{font-family:var(--mono);font-weight:600;font-size:13px}
table.spec td{font-variant-numeric:tabular-nums;color:#2c2e33}
@media(max-width:760px){
  /* Each row becomes a stacked card with its column label in front of the value */
  table.spec thead{display:none}
  table.spec tr{display:block;border-bottom:1px solid var(--line);padding:8px 0}
  table.spec tr:last-child{border-bottom:0}
  table.spec td,table.spec th{display:flex;justify-content:space-between;gap:16px;border:0;padding:9px 18px}
  table.spec td::before{
    content:attr(data-label);font-family:var(--mono);font-size:11px;letter-spacing:.06em;
    text-transform:uppercase;color:var(--steel);flex:none;
  }
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer{background:var(--ink);color:var(--paper);padding:clamp(64px,8vw,110px) var(--mx) 40px;position:relative;overflow:hidden}
.footer__grid{display:grid;grid-template-columns:1.4fr repeat(4,1fr);gap:clamp(24px,4vw,48px);position:relative;z-index:2}
@media(max-width:1000px){.footer__grid{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.footer__grid{grid-template-columns:1fr}}
.footer__logo{height:18px;width:auto;margin-bottom:20px}
.footer h2{font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--ember);margin-bottom:16px;font-weight:500}
.footer ul{list-style:none;display:flex;flex-direction:column;gap:2px}
.footer ul a{font-size:15px;color:rgba(243,241,234,.72);transition:color .2s;padding:7px 0;display:inline-block;min-height:34px}
.footer ul a:hover{color:var(--paper)}
.footer__about p{font-size:15px;color:rgba(243,241,234,.6);line-height:1.6;max-width:34ch}
.footer__contact{margin-top:18px;font-family:var(--mono);font-size:12px;color:rgba(243,241,234,.72);display:flex;flex-direction:column;gap:6px}
.footer__bottom{
  margin-top:clamp(40px,6vw,72px);padding-top:24px;border-top:1px solid rgba(243,241,234,.14);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:rgba(243,241,234,.45);
  position:relative;z-index:2;
}
.footer__bottom a:hover{color:var(--paper)}
.footer__certs{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
.footer__certs span{font-family:var(--mono);font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:rgba(243,241,234,.55);border:1px solid rgba(243,241,234,.2);border-radius:3px;padding:6px 10px}

/* ==========================================================================
   Reveal on scroll — preserved from the approved project, motion-safe
   ========================================================================== */
.rv{opacity:0;transform:translateY(18px);transition:opacity .8s cubic-bezier(.2,.7,.2,1),transform .8s cubic-bezier(.2,.7,.2,1)}
.rv.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  .rv{opacity:1!important;transform:none!important;transition:none!important}
  *{animation-duration:.001ms!important;transition-duration:.001ms!important}
}
/* If JavaScript never runs, content must still be visible (SEO + resilience) */
.no-js .rv{opacity:1;transform:none}

/* ==========================================================================
   HISA CONTROL PLATFORM (built, gated by content/features.json)
   Uses only the existing tokens — no new colours, no new fonts.
   The digital layer connecting HISA products: typographic, calm, engineered.
   ========================================================================== */

.platform__head{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,5vw,72px);align-items:start;margin-bottom:clamp(44px,6vw,76px)}
@media(max-width:900px){.platform__head{grid-template-columns:1fr;gap:28px}}

.platform__parts{display:flex;flex-wrap:wrap;gap:8px 20px}
.platform__parts span{font-size:clamp(17px,2vw,22px);font-weight:600;letter-spacing:-.01em;color:rgba(243,241,234,.7)}
.platform-hero .platform__parts span{color:var(--steel)}
.platform__closing{
  margin-top:18px;font-size:clamp(24px,3.4vw,42px);font-weight:900;
  letter-spacing:-.03em;line-height:1;color:var(--ember);
}
.platform__closing--light{color:var(--ember)}

.platform__grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:clamp(28px,5vw,64px);align-items:center}
@media(max-width:900px){.platform__grid{grid-template-columns:1fr;gap:36px}}

/* ---- device / app slot: a frame, never a simulated screen ---- */
.device{display:flex;justify-content:center}
.device__frame{
  width:min(280px,72vw);aspect-ratio:9/19.5;border-radius:34px;overflow:hidden;
  border:1px solid rgba(243,241,234,.22);background:rgba(243,241,234,.04);
  position:relative;display:flex;align-items:center;justify-content:center;
}
.bg-cloud .device__frame,.platform-hero .device__frame{border-color:var(--line);background:#fff}
.device__frame img{width:100%;height:100%;object-fit:cover}
.device__frame--empty{flex-direction:column;gap:22px;padding:34px 26px;text-align:center;border-style:dashed}
.device__mark{font-size:44px;color:rgba(243,241,234,.18);line-height:1}
.bg-cloud .device__mark{color:rgba(23,24,27,.16)}
.device__note{display:flex;flex-direction:column;gap:8px}
.device__note .t{font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--ember)}
.device__note .d{font-size:13px;line-height:1.5;color:rgba(243,241,234,.5)}
.bg-cloud .device__note .d{color:var(--steel)}

/* ---- energy flow: solar → battery → home → heat → hot water ---- */
.flow{position:relative}
.flow__nodes{list-style:none;display:grid;grid-template-columns:repeat(5,1fr);gap:14px;position:relative;z-index:2}
@media(max-width:820px){.flow__nodes{grid-template-columns:1fr;gap:0}}
.flow__node{
  display:flex;flex-direction:column;gap:6px;padding:20px 16px;
  border-top:1px solid rgba(243,241,234,.2);
}
.bg-cloud .flow__node{border-top-color:var(--line)}
@media(max-width:820px){
  .flow__node{flex-direction:row;align-items:baseline;gap:14px;padding:16px 0}
  .flow__node .flow__note{margin-left:auto}
}
.flow__i{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;color:var(--ember)}
.flow__label{font-size:clamp(16px,1.8vw,20px);font-weight:700;letter-spacing:-.01em}
.flow__note{font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;color:rgba(243,241,234,.5)}
.bg-cloud .flow__note{color:var(--steel)}

/* the rail + travelling pulse: energy moving through the system */
.flow__rail{position:relative;height:1px;background:rgba(243,241,234,.16);margin-top:4px;overflow:hidden}
.bg-cloud .flow__rail{background:var(--line)}
@media(max-width:820px){.flow__rail{display:none}}
.flow__pulse{
  position:absolute;top:0;left:0;width:22%;height:1px;
  background:linear-gradient(90deg,transparent,var(--ember),transparent);
  animation:flowPulse 4.5s cubic-bezier(.4,0,.6,1) infinite;
}
@keyframes flowPulse{0%{transform:translateX(-100%)}100%{transform:translateX(560%)}}
@media(prefers-reduced-motion:reduce){.flow__pulse{animation:none;opacity:.5}}

.flow__interface{
  margin-top:26px;display:flex;align-items:center;gap:12px;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--ember);
}
.flow__interface .slash{font-size:14px}

/* ---- confirmed-capability list ---- */
.ticklist{list-style:none;margin-top:22px}
.ticklist li{
  position:relative;padding:11px 0 11px 26px;font-size:16px;
  border-bottom:1px solid var(--line2);
}
.bg-ink .ticklist li{border-bottom-color:rgba(243,241,234,.12)}
.ticklist li::before{
  content:"/";position:absolute;left:0;top:11px;
  font-family:var(--mono);font-weight:700;color:var(--ember);
}

/* ---- awaiting-confirmation note ---- */
.awaiting{
  margin-top:22px;font-size:12px;letter-spacing:.06em;color:var(--steel);
  border-left:2px solid var(--ember);padding-left:12px;
}

/* ---- fleet / estate proposition ---- */
.fleet .h-lg{max-width:16ch}

/* ---- internal preview banner (never on a public page) ---- */
.internal-banner{
  position:sticky;top:0;z-index:130;background:var(--ember);color:#fff;
  padding:12px var(--mx);font-family:var(--mono);font-size:11px;
  letter-spacing:.12em;text-transform:uppercase;display:flex;gap:16px;
  justify-content:space-between;flex-wrap:wrap;
}