/* ==========================================================================
   GridAra — gridara.com.au
   Commercial building energy flexibility. Dark navy, Arial, sober/technical.
   Palette: Navy #0A2540 · Deep teal #084D40 · Solar amber #D97706
   ========================================================================== */

:root {
  /* Grounds */
  --navy:        #0A2540;   /* primary background */
  --navy-band:   #0d2b4d;   /* alternate section band */
  --surface:     #10315a;   /* cards / panels */
  --surface-2:   #0e2f56;   /* panels on band / figures */
  --surface-hi:  #143a68;

  /* Teal — secondary accent + dividers */
  --teal:        #084D40;
  --teal-line:   #0e5f4f;   /* visible divider on navy */
  --teal-bright: #2f9c86;   /* teal text / strokes on dark */

  /* Amber — CTAs, key figures, highlights */
  --amber:       #D97706;
  --amber-bright:#F59E0B;

  /* Ink */
  --ink:         #eef3f9;
  --ink-dim:     #a7bacd;
  --ink-mute:    #6f89a1;

  --line:        rgba(255,255,255,0.09);
  --line-soft:   rgba(255,255,255,0.05);

  --radius:      4px;
  --maxw:        1080px;
  --gutter:      7vw;

  --font: Arial, "Helvetica Neue", Helvetica, "Segoe UI", sans-serif;
}

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

body {
  font-family: var(--font);
  background: var(--navy);
  color: var(--ink-dim);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--amber-bright); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { max-width: 100%; }
::selection { background: var(--amber); color: var(--navy); }

/* ---------- Layout primitives ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding-left: var(--gutter); padding-right: var(--gutter); }
main { display: block; }
section { padding: 104px 0; }
.band { background: var(--navy-band); border-top: 1px solid var(--teal-line); border-bottom: 1px solid var(--teal-line); }
.rule { height: 1px; background: var(--teal-line); border: 0; }

.stack > * + * { margin-top: 1.15rem; }
.measure { max-width: 66ch; }
.measure-wide { max-width: 78ch; }

/* ---------- Type ---------- */
h1, h2, h3, h4 { color: var(--ink); font-weight: 700; line-height: 1.2; letter-spacing: -0.01em; }
h1 { font-size: clamp(2rem, 4.6vw, 3rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); }
h3 { font-size: 1.12rem; }
h4 { font-size: 0.95rem; }
p { max-width: 66ch; }
strong { color: var(--ink); font-weight: 700; }

.eyebrow {
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--teal-bright); margin-bottom: 1rem;
}
.lede { font-size: clamp(1.05rem, 1.7vw, 1.2rem); color: var(--ink-dim); max-width: 60ch; }
.subtle { color: var(--ink-mute); font-size: 0.9rem; }
.keyfig { color: var(--amber-bright); font-weight: 700; }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10,37,64,0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--teal-line);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter);
  height: 66px; display: flex; align-items: center; justify-content: space-between; gap: 1.5rem;
}
.brand { display: flex; align-items: center; gap: 11px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand svg { width: 34px; height: 34px; display: block; flex-shrink: 0; }
.brand b { font-size: 1.12rem; font-weight: 700; letter-spacing: 0.14em; }
.footer-brand .brand svg { width: 32px; height: 32px; }

.nav-links { list-style: none; display: flex; align-items: center; gap: 1.3rem; }
.nav-links a {
  color: var(--ink-dim); font-size: 0.78rem; letter-spacing: 0.04em; text-transform: uppercase;
  white-space: nowrap; transition: color 0.15s;
}
.nav-links a:hover { color: var(--ink); text-decoration: none; }
.nav-links a[aria-current="page"] { color: var(--amber-bright); }

.nav-cta {
  background: var(--amber); color: var(--navy) !important;
  padding: 0.5rem 1rem; border-radius: var(--radius);
  font-weight: 700; letter-spacing: 0.02em !important; text-transform: none !important;
}
.nav-cta:hover { background: var(--amber-bright); text-decoration: none; }

.nav-toggle {
  display: none; width: 40px; height: 34px;
  background: transparent; border: 1px solid var(--line); border-radius: var(--radius);
  color: var(--ink); font-size: 1.05rem; cursor: pointer;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--font); font-size: 0.92rem; font-weight: 700; letter-spacing: 0.02em;
  padding: 0.85rem 1.6rem; border-radius: var(--radius); border: 1px solid transparent;
  cursor: pointer; transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.btn-primary { background: var(--amber); color: var(--navy); }
.btn-primary:hover { background: var(--amber-bright); text-decoration: none; }
.btn-secondary { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-secondary:hover { border-color: var(--teal-bright); color: #fff; text-decoration: none; }
.btn-row { display: flex; flex-wrap: wrap; gap: 0.9rem; }

/* ---------- Hero ---------- */
.hero { padding: 88px 0 96px; }
.hero h1 { max-width: 20ch; margin-bottom: 1.3rem; }
.hero .lede { margin-bottom: 2rem; }

/* ---------- Cards ---------- */
.grid { display: grid; gap: 1.25rem; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.7rem;
}
.card h3 { margin-bottom: 0.5rem; }
.card p { color: var(--ink-dim); font-size: 0.94rem; }
.card .benefit { color: var(--ink); font-weight: 700; }
.card .mech { color: var(--ink-mute); font-size: 0.88rem; margin-top: 0.6rem; }
.card-label {
  font-size: 0.7rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--teal-bright); margin-bottom: 0.7rem;
}

/* ---------- Numbered steps ---------- */
.steps { list-style: none; counter-reset: s; display: grid; gap: 0; }
.steps li {
  counter-increment: s;
  display: grid; grid-template-columns: 44px 1fr; gap: 1.3rem;
  padding: 1.5rem 0; border-top: 1px solid var(--line-soft);
}
.steps li:first-child { border-top: 0; }
.steps li::before {
  content: counter(s, decimal-leading-zero);
  font-size: 0.85rem; font-weight: 700; color: var(--amber-bright);
  padding-top: 0.15rem; letter-spacing: 0.05em;
}
.steps h3 { font-size: 1.02rem; margin-bottom: 0.3rem; }
.steps p { color: var(--ink-dim); font-size: 0.93rem; }

/* ---------- Two-column split ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 3.5rem; align-items: start; }
.split.narrow { gap: 2.5rem; }

/* ---------- Fact list / panel ---------- */
.panel {
  background: var(--surface-2); border: 1px solid var(--teal-line);
  border-radius: var(--radius); padding: 1.9rem;
}
.panel h3 { font-size: 0.98rem; margin-bottom: 1rem; }
.deflist { list-style: none; display: grid; gap: 0; }
.deflist li {
  padding: 0.75rem 0; border-top: 1px solid var(--line-soft);
  font-size: 0.92rem; color: var(--ink-dim);
}
.deflist li:first-child { border-top: 0; }
.deflist li strong { color: var(--ink); }

/* ---------- Callout ---------- */
.callout {
  border-left: 3px solid var(--amber); background: rgba(217,119,6,0.07);
  padding: 1.1rem 1.4rem; border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--ink-dim); font-size: 0.95rem;
}
.callout strong { color: var(--amber-bright); }

/* ---------- Industry news / references ---------- */
.news { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.news li {
  display: grid; grid-template-columns: 148px 1fr; gap: 1.8rem;
  padding: 1.7rem 0; border-top: 1px solid var(--line-soft);
}
.news li:first-child { border-top: 0; }
.news .when { font-size: 0.82rem; font-weight: 700; color: var(--amber-bright); letter-spacing: 0.02em; }
.news .src { font-size: 0.68rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; color: var(--teal-bright); margin-bottom: 0.35rem; }
.news h3 { font-size: 1.02rem; margin-bottom: 0.45rem; }
.news p { font-size: 0.92rem; color: var(--ink-dim); margin-bottom: 0.55rem; max-width: 68ch; }
.news a.more { font-size: 0.82rem; font-weight: 700; color: var(--amber-bright); word-break: break-word; }
.news a.more:hover { color: var(--amber); }
@media (max-width: 640px) {
  .news li { grid-template-columns: 1fr; gap: 0.5rem; }
}

/* ---------- Figure / diagram ---------- */
.figure {
  background: var(--surface-2); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.6rem 1.6rem 1.3rem;
  overflow-x: auto;
}
.figure svg { display: block; margin: 0 auto; max-width: 100%; height: auto; }
.figure figcaption {
  margin-top: 1rem; padding-top: 0.9rem; border-top: 1px solid var(--line-soft);
  font-size: 0.8rem; color: var(--ink-mute); line-height: 1.6;
}
.figure figcaption b { color: var(--ink-dim); font-weight: 700; }
.fig-tag {
  display: inline-block; font-size: 0.64rem; font-weight: 700; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--ink-mute);
  border: 1px solid var(--line); border-radius: 2px; padding: 0.12rem 0.4rem; margin-bottom: 0.9rem;
}

/* ---------- Stat row ---------- */
.stats { display: flex; flex-wrap: wrap; gap: 3rem; }
.stat .n { font-size: 1.9rem; font-weight: 700; color: var(--amber-bright); line-height: 1.1; }
.stat .k { font-size: 0.78rem; color: var(--ink-mute); text-transform: uppercase; letter-spacing: 0.08em; max-width: 26ch; margin-top: 0.35rem; }

/* ---------- Form ---------- */
.form { display: grid; gap: 1.1rem; max-width: 540px; }
.form .row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.1rem; }
.field { display: grid; gap: 0.4rem; }
.field label { font-size: 0.8rem; color: var(--ink-dim); letter-spacing: 0.03em; }
.field input, .field select, .field textarea {
  font-family: var(--font); font-size: 0.92rem; color: var(--ink);
  background: rgba(0,0,0,0.22); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 0.7rem 0.85rem;
}
.field textarea { min-height: 120px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: 2px solid var(--teal-bright); outline-offset: 1px; border-color: transparent;
}
.field select option { background: var(--navy-band); }
.form-note {
  font-size: 0.78rem; color: var(--ink-mute);
  border: 1px dashed var(--line); border-radius: var(--radius); padding: 0.7rem 0.85rem;
}

/* ---------- Footer ---------- */
.footer { background: var(--navy-band); border-top: 1px solid var(--teal-line); padding: 3rem 0 2.2rem; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 2.5rem; margin-bottom: 2.2rem; }
.footer h4 { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.14em; color: var(--teal-bright); margin-bottom: 0.9rem; }
.footer ul { list-style: none; display: grid; gap: 0.5rem; }
.footer ul a { color: var(--ink-dim); font-size: 0.86rem; }
.footer ul a:hover { color: var(--ink); text-decoration: none; }
.footer-brand p { color: var(--ink-mute); font-size: 0.84rem; margin-top: 0.9rem; max-width: 44ch; }
.footer-legal { border-top: 1px solid var(--line-soft); padding-top: 1.4rem; display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between; }
.footer-legal p { font-size: 0.74rem; color: var(--ink-mute); max-width: 74ch; }

/* ---------- Focus visibility ---------- */
a:focus-visible, .btn:focus-visible, .nav-toggle:focus-visible, button:focus-visible {
  outline: 2px solid var(--amber-bright); outline-offset: 2px;
}

/* ---------- Diagram helpers (SVG text via CSS custom classes) ---------- */
.dgm-surface { fill: var(--surface); }
.dgm-surface-2 { fill: var(--surface-2); }
.dgm-stroke { stroke: var(--line); }
.dgm-ink { fill: var(--ink); }
.dgm-dim { fill: var(--ink-dim); }
.dgm-mute { fill: var(--ink-mute); }
.dgm-amber { fill: var(--amber-bright); }
.dgm-amber-stroke { stroke: var(--amber); }
.dgm-teal-stroke { stroke: var(--teal-bright); }
.dgm-teal { fill: var(--teal-bright); }
text { font-family: var(--font); }

/* ---------- Responsive ---------- */
@media (max-width: 1000px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute; top: 66px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--navy); border-bottom: 1px solid var(--teal-line);
    padding: 0.5rem var(--gutter) 1.3rem;
    transform: translateY(-145%); transition: transform 0.25s ease; pointer-events: none;
  }
  .nav-links.open { transform: none; pointer-events: auto; }
  .nav-links li { width: 100%; }
  .nav-links a { display: block; padding: 0.9rem 0; font-size: 0.82rem; }
  .nav-links .nav-cta { display: inline-block; margin-top: 0.7rem; width: max-content; }
}
@media (max-width: 900px) {
  section { padding: 76px 0; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .split, .split.narrow { grid-template-columns: 1fr; gap: 2rem; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  .nav-links { transition: none; }
}
@media (max-width: 560px) {
  :root { --gutter: 6vw; }
  .footer-grid { grid-template-columns: 1fr; }
  .form .row2 { grid-template-columns: 1fr; }
  .stats { gap: 1.6rem 2.5rem; }
}