/* ==========================================================================
   Grid CEO — off-grid energy
   gc.css : shared design system
   Aesthetic: dark industrial graphite + solar amber + off-grid green.
   Modelled on the private-islands house structure; original theme.
   ========================================================================== */

:root{
  /* palette — dark theme: true black */
  --ink:#000000;          /* page ground — black */
  --panel:#0a0c0d;        /* raised panel */
  --panel-2:#0f1314;      /* card surface */
  --line:#20272a;         /* hairline */
  --line-soft:#141819;
  --fog:#ccd4d7;          /* primary text */
  --slate:#8a969b;        /* muted text */
  --slate-2:#69747a;
  --paper:#f6f9f9;        /* headings on dark */
  --header-bg:rgba(0,0,0,.68);

  --amber:#f4a63b;        /* solar accent */
  --amber-deep:#c97d16;
  --amber-soft:rgba(244,166,59,.12);
  --volt:#57d09a;         /* off-grid green / "power on" */
  --volt-deep:#2f9d6c;
  --volt-soft:rgba(87,208,154,.12);

  --serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;
  --sans:"Inter","Helvetica Neue",Arial,system-ui,-apple-system,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;

  --wrap:1160px;
  --radius:12px;
  --shadow:0 1px 0 rgba(255,255,255,.03) inset, 0 20px 44px -26px rgba(0,0,0,.9);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:
    radial-gradient(1200px 620px at 78% -8%, rgba(244,166,59,.10), transparent 60%),
    radial-gradient(900px 520px at -6% 8%, rgba(87,208,154,.07), transparent 55%),
    var(--ink);
  color:var(--fog);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block}
a{color:var(--amber);text-decoration:none}
a:hover{color:var(--amber-deep)}

h1,h2,h3,h4{font-family:var(--serif);color:var(--paper);line-height:1.15;font-weight:600;letter-spacing:-.01em}
h1{font-size:clamp(2.1rem,4.6vw,3.4rem);margin:.2em 0 .4em}
h2{font-size:clamp(1.5rem,3vw,2.1rem);margin:1.6em 0 .5em}
h3{font-size:1.22rem;margin:.2em 0 .4em}
p{margin:0 0 1rem}

/* ---- layout helpers -------------------------------------------------- */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:clamp(1.1rem,4vw,2.4rem)}
.narrow{max-width:760px}
.section{padding:clamp(3rem,7vw,5.6rem) 0}
.section.tint{background:linear-gradient(180deg,var(--panel),transparent 120%);border-block:1px solid var(--line-soft)}
.section.tight{padding-block:clamp(2rem,4vw,3rem)}
.flex{display:flex;gap:.8rem;flex-wrap:wrap;align-items:center}
.between{display:flex;justify-content:space-between;align-items:center;gap:1rem;flex-wrap:wrap}
.center{text-align:center}
.mt0{margin-top:0}

/* ---- kicker / lede / small ------------------------------------------- */
.kicker{
  font-family:var(--mono);text-transform:uppercase;letter-spacing:.22em;
  font-size:.72rem;color:var(--amber);margin:0 0 .5rem;font-weight:500;
}
.lede{font-size:1.22rem;line-height:1.6;color:var(--fog)}
.muted{color:var(--slate)}
.small{font-size:.85rem}
.mono{font-family:var(--mono)}

.divider-brass{height:2px;width:84px;margin:1.5rem 0;
  background:linear-gradient(90deg,var(--amber),transparent)}
.rule-kicker{display:flex;align-items:center;gap:1rem;margin:2.4rem 0 1.4rem}
.rule-kicker::after{content:"";flex:1;height:1px;background:var(--line)}

/* ---- header / nav ---------------------------------------------------- */
.gc-top{position:sticky;top:0;z-index:40;
  background:var(--header-bg);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line-soft)}
.gc-top .bar{display:flex;align-items:center;justify-content:flex-start;
  gap:1.5rem;min-height:64px}
.gc-nav{margin-left:auto}
.gc-actions{display:flex;align-items:center;gap:.75rem;padding-left:.9rem;
  border-left:1px solid var(--line-soft)}
.gc-brand{display:flex;flex-direction:column;line-height:1;
  font-family:var(--serif);font-weight:700;font-size:1.28rem;color:var(--paper);letter-spacing:.01em}
.gc-brand:hover{color:var(--paper)}
.gc-brand .mark{color:var(--amber)}
.gc-brand small{font-family:var(--mono);font-size:.6rem;letter-spacing:.28em;
  text-transform:uppercase;color:var(--slate-2);margin-top:.32rem;font-weight:400}
.gc-nav{display:flex;align-items:center;gap:1.35rem}
.gc-nav a{color:var(--fog);font-size:.94rem;font-weight:500}
.gc-nav a:hover,.gc-nav a[aria-current=page]{color:var(--amber)}
.gc-nav a.cta{border:1px solid var(--amber);color:var(--amber);
  padding:.42rem .9rem;border-radius:8px}
.gc-nav a.cta:hover{background:var(--amber);color:var(--ink)}
.gc-burger{display:none;background:none;border:1px solid var(--line);
  color:var(--fog);font-size:1.2rem;border-radius:8px;padding:.25rem .55rem;cursor:pointer}

.crumb{padding:.9rem 0;color:var(--slate-2);font-size:.82rem;font-family:var(--mono);
  letter-spacing:.04em}
.crumb a{color:var(--slate)}

/* ---- hero ------------------------------------------------------------ */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line-soft)}
.hero .bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.5}
.hero .scrim{position:absolute;inset:0;
  background:
    linear-gradient(180deg,rgba(13,17,19,.55),rgba(13,17,19,.9)),
    radial-gradient(700px 420px at 20% 10%,rgba(244,166,59,.12),transparent 60%)}
.hero .inner{position:relative;padding-block:clamp(4rem,11vw,8rem);max-width:820px}
.hero h1{margin-top:.3rem}
.hero .lede{max-width:56ch}
/* placeholder grid texture so hero reads well before owner adds imagery */
.hero.placeholder{background:
  linear-gradient(180deg,var(--panel),var(--ink)),
  repeating-linear-gradient(90deg,rgba(255,255,255,.03) 0 1px,transparent 1px 46px),
  repeating-linear-gradient(0deg,rgba(255,255,255,.03) 0 1px,transparent 1px 46px)}
.hero.placeholder .scrim{background:
  radial-gradient(760px 460px at 78% -10%,rgba(244,166,59,.14),transparent 60%),
  radial-gradient(620px 420px at 6% 110%,rgba(87,208,154,.10),transparent 60%)}

/* ---- buttons --------------------------------------------------------- */
.btn{display:inline-flex;align-items:center;gap:.5rem;cursor:pointer;
  font-family:var(--sans);font-weight:600;font-size:.95rem;
  padding:.72rem 1.3rem;border-radius:9px;border:1px solid transparent;
  transition:transform .08s ease,background .15s ease,border-color .15s ease}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--amber);color:#20160a}
.btn-primary:hover{background:var(--amber-deep);color:#1a1105}
.btn-volt{background:var(--volt);color:#062015}
.btn-volt:hover{background:var(--volt-deep);color:#03150d}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--fog)}
.btn-ghost:hover{border-color:var(--amber);color:var(--amber)}
.btn-block{display:flex;width:100%;justify-content:center}

/* ---- cards / grid ---------------------------------------------------- */
.grid{display:grid;gap:1.1rem}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--panel-2);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow)}
.card .pad{padding:1.4rem 1.5rem}
.card h3{margin-top:0}
.card-link{transition:border-color .15s ease,transform .1s ease}
.card-link:hover{border-color:var(--amber);transform:translateY(-2px)}
.card-link a{color:inherit;display:block}
.icon{font-size:1.5rem;line-height:1;color:var(--amber);
  display:inline-block;margin-bottom:.6rem}
.card-link:nth-child(3n+2) .icon{color:var(--volt)}

.tag{display:inline-block;font-family:var(--mono);font-size:.68rem;
  text-transform:uppercase;letter-spacing:.16em;color:var(--volt);
  border:1px solid var(--volt-soft);background:var(--volt-soft);
  padding:.2rem .55rem;border-radius:999px}
.stat{font-family:var(--serif);font-size:2.6rem;color:var(--paper);margin:.2rem 0}

/* checklist */
ul.check{list-style:none;padding:0;margin:1rem 0}
ul.check li{position:relative;padding-left:1.7rem;margin:.55rem 0}
ul.check li::before{content:"›";position:absolute;left:.2rem;top:-.05rem;
  color:var(--volt);font-weight:700;font-size:1.1rem}

/* ---- forms ----------------------------------------------------------- */
.form-card{background:var(--panel-2);border:1px solid var(--line);
  border-radius:var(--radius);padding:1.6rem;box-shadow:var(--shadow)}
.field{margin:0 0 1rem}
.field label{display:block;font-size:.82rem;font-weight:600;
  letter-spacing:.02em;color:var(--fog);margin-bottom:.35rem}
.field input,.field textarea,.field select{
  width:100%;background:var(--ink);border:1px solid var(--line);
  color:var(--fog);border-radius:9px;padding:.7rem .8rem;font:inherit;font-size:.95rem}
.field input:focus,.field textarea:focus,.field select:focus{
  outline:none;border-color:var(--amber);box-shadow:0 0 0 3px var(--amber-soft)}
.field textarea{resize:vertical;min-height:120px}
.chan-row{display:flex;gap:.5rem;flex-wrap:wrap}
.chan{display:inline-flex;align-items:center;gap:.4rem;cursor:pointer;
  border:1px solid var(--line);border-radius:8px;padding:.4rem .7rem;font-size:.9rem}
.chan input{width:auto;margin:0}
.chan:has(input:checked){border-color:var(--volt);background:var(--volt-soft);color:var(--paper)}
.form-note{font-size:.82rem;color:var(--slate);margin:.5rem 0 0}

/* ---- footer ---------------------------------------------------------- */
.gc-foot{border-top:1px solid var(--line);background:var(--panel);
  padding:3rem 0 2rem;margin-top:2rem}
.gc-foot .cols{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr 1fr;gap:2rem}
.gc-foot h4{font-family:var(--sans);text-transform:uppercase;letter-spacing:.14em;
  font-size:.74rem;color:var(--slate);margin:0 0 .8rem}
.gc-foot ul{list-style:none;margin:0;padding:0}
.gc-foot ul li{margin:.4rem 0}
.gc-foot ul a{color:var(--fog);font-size:.92rem}
.gc-foot ul a:hover{color:var(--amber)}
.gc-foot .gc-brand{color:var(--paper);align-items:flex-start}
.gc-foot .gc-brand img{width:auto;align-self:flex-start}
.gc-foot .fine{border-top:1px solid var(--line-soft);margin-top:2rem;padding-top:1.2rem;
  color:var(--slate-2);font-size:.8rem}

/* ---- responsive ------------------------------------------------------ */
@media(max-width:860px){
  .g2,.g3,.g4{grid-template-columns:1fr}
  .gc-foot .cols{grid-template-columns:1fr 1fr}
  .gc-burger{display:inline-block}
  .gc-nav{position:absolute;top:64px;right:0;left:0;flex-direction:column;
    align-items:stretch;gap:0;background:var(--panel);border-bottom:1px solid var(--line);
    padding:.5rem 0;display:none}
  .gc-nav.open{display:flex}
  .gc-nav a{padding:.8rem clamp(1.1rem,4vw,2.4rem)}
  .gc-nav a.cta{margin:.5rem clamp(1.1rem,4vw,2.4rem);text-align:center;justify-content:center}
  .gc-top .bar{position:relative}
}
@media(max-width:520px){
  .gc-foot .cols{grid-template-columns:1fr}
}

/* ---- region switcher (US / EU editions) ------------------------------- */
.gc-region{display:inline-flex;gap:.4rem;align-items:center}
.gc-region .rf{display:inline-flex;align-items:center;gap:.35rem;padding:.25rem .4rem;
  border-radius:6px;color:var(--fog);font-size:.8rem;
  letter-spacing:.03em;line-height:1;opacity:.5}
.gc-region .rf img{display:block;border-radius:2px}
.gc-region .rf:hover{opacity:1;color:var(--paper)}
.gc-region .rf.on{opacity:1;color:var(--paper)}
.gc-region-lg{gap:1rem}
.gc-region-lg .rf{flex-direction:column;padding:1rem 1.4rem;font-size:.95rem;gap:.55rem}

/* ---- light theme (clean warm paper + crisp white cards) --------------- */
html[data-theme="light"]{
  --ink:#f3f1ea;        /* warm paper ground (never stark white) */
  --panel:#ffffff;      /* crisp card / surface */
  --panel-2:#ffffff;
  --line:#e5e0d5;        /* warm hairline */
  --line-soft:#eeeae1;
  --fog:#1f2628;        /* dark, high-contrast body text */
  --slate:#5b6467;
  --slate-2:#828a8c;
  --paper:#0f1517;      /* near-black headings */
  --header-bg:rgba(249,247,242,.82);
  --shadow:0 1px 2px rgba(20,24,26,.04), 0 16px 34px -26px rgba(20,24,26,.28);
}
html[data-theme="light"] body{
  background:
    radial-gradient(1100px 560px at 82% -10%, rgba(244,166,59,.09), transparent 62%),
    radial-gradient(820px 480px at -8% 6%, rgba(87,208,154,.05), transparent 58%),
    var(--ink);
}
html[data-theme="light"] a{color:var(--amber-deep)}
html[data-theme="light"] .card,
html[data-theme="light"] .form-card{border-color:var(--line)}
html[data-theme="light"] .field input,
html[data-theme="light"] .field textarea,
html[data-theme="light"] .field select{background:#fbf9f4}
/* ---- theme toggle (forge-style sun/moon) ------------------------------- */
.theme-toggle{width:38px;height:38px;border-radius:9px;border:0;
  background:transparent;color:var(--fog);display:grid;place-items:center;cursor:pointer;
  transition:.15s;flex:none;padding:0}
.theme-toggle:hover{color:var(--amber)}
.theme-toggle svg{width:19px;height:19px}
.theme-toggle .moon{display:none}
html[data-theme="light"] .theme-toggle .sun{display:none}
html[data-theme="light"] .theme-toggle .moon{display:block}