/* ==========================================================================
   HERTS ENERGY — design system
   Grayscale, blueprint/spec-sheet identity built around the brand's hertz
   waveform mark. No color accents — ink, paper, and everything between.
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{
  --ink:        #0f0f0f;
  --ink-soft:   #2b2b28;
  --paper:      #faf9f7;
  --paper-alt:  #efeee9;
  --line:       #d8d6d0;
  --muted:      #6b6963;
  --white:      #ffffff;
  --black:      #000000;

  --display: 'Space Grotesk', sans-serif;
  --body:    'Inter', sans-serif;
  --mono:    'IBM Plex Mono', monospace;

  --maxw: 1180px;
  --gap:  1px; /* hairline unit */
}

*{ box-sizing:border-box; margin:0; padding:0; }
html{ scroll-behavior:smooth; }
body{
  font-family: var(--body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
.wrap{ max-width: var(--maxw); margin:0 auto; padding:0 32px; }

/* focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
  outline: 2px solid var(--ink); outline-offset: 3px;
}

/* -------------------------------------------------- typography helpers */
.eyebrow{
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
  display:flex; align-items:center; gap:10px;
}
.eyebrow::before{
  content:"";
  width:18px; height:1px; background:var(--muted);
  display:inline-block;
}
h1,h2,h3{ font-family: var(--display); font-weight:600; letter-spacing:-0.01em; }
h1{ font-size: clamp(36px, 5vw, 58px); line-height:1.06; }
h2{ font-size: clamp(26px, 3.2vw, 36px); line-height:1.15; }
h3{ font-size: 18px; }
p.lead{ font-size: 18px; color: var(--ink-soft); }
.muted{ color: var(--muted); }

/* -------------------------------------------------- waveform signature */
/* echoes the logo's hertz mark — used as hero graphic + section dividers */
.hz-line{ width:100%; display:block; }
.hz-line path{ fill:none; stroke:var(--ink); stroke-width:2; }
.hz-divider{ width:100%; height:20px; opacity:.55; margin: 0 0 -1px; }
.hz-divider path{ fill:none; stroke:var(--line); stroke-width:1.5; }

/* -------------------------------------------------- header */
header.site{
  position: sticky; top:0; z-index:50;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  padding: 18px 32px;
  max-width: var(--maxw); margin:0 auto;
}
.brand{ display:flex; align-items:center; gap:14px; }
.brand img{ height:34px; width:auto; }
.brand .tagline{
  font-family: var(--mono); font-size:10px; letter-spacing:.16em;
  color: var(--muted); text-transform:uppercase; margin-top:2px;
}
.navlinks{
  display:flex; gap:30px; align-items:center;
  font-family: var(--mono); font-size:12px; letter-spacing:.06em;
  text-transform:uppercase;
}
.navlinks a{ padding:6px 0; border-bottom:1px solid transparent; }
.navlinks a:hover, .navlinks a[aria-current="page"]{ border-bottom-color: var(--ink); }
.btn{
  font-family: var(--mono); font-size:12px; letter-spacing:.08em; text-transform:uppercase;
  border:1px solid var(--ink); padding:11px 20px;
  display:inline-block; white-space:nowrap;
  transition: background .15s ease, color .15s ease;
}
.btn:hover{ background: var(--ink); color: var(--paper); }
.btn-solid{ background:var(--ink); color:var(--paper); }
.btn-solid:hover{ background:transparent; color:var(--ink); }
.navtoggle{ display:none; }

/* -------------------------------------------------- hero */
.hero{
  padding: 88px 0 64px;
  border-bottom: 1px solid var(--line);
}
.hero .wrap{
  display:grid; grid-template-columns: 1.1fr .9fr; gap:64px; align-items:center;
}
.hero-copy p.lead{ margin: 20px 0 32px; max-width: 46ch; }
.hero-actions{ display:flex; gap:14px; flex-wrap:wrap; }
.hero-figure{
  border:1px solid var(--line);
  background: var(--paper-alt);
  padding: 28px;
  position:relative;
  aspect-ratio: 1 / 1;
  display:flex; align-items:center; justify-content:center;
}
.hero-figure .gridbg{
  position:absolute; inset:0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 24px 24px;
  opacity:.5;
}
.hero-figure svg{ position:relative; z-index:1; }
.hero-figure .corner{
  position:absolute; font-family:var(--mono); font-size:11px; color:var(--muted);
}
.corner.tl{ top:14px; left:14px; } .corner.br{ bottom:14px; right:14px; }

/* -------------------------------------------------- sections */
section{ padding: 72px 0; }
section.alt{ background: var(--paper-alt); border-top:1px solid var(--line); border-bottom:1px solid var(--line); }
.section-head{ margin-bottom: 40px; max-width: 60ch; }
.section-head h2{ margin-top:10px; }
.section-head p{ margin-top:12px; color:var(--muted); }

/* -------------------------------------------------- card grid (services) */
.grid{
  display:grid; grid-template-columns: repeat(4, 1fr); gap:1px;
  background: var(--line);
  border:1px solid var(--line);
}
.grid.cols-3{ grid-template-columns: repeat(3,1fr); }
.card{
  background: var(--paper); padding: 28px 22px;
  display:flex; flex-direction:column; gap:16px; min-height: 168px;
}
.card .num{ font-family:var(--mono); font-size:12px; color:var(--muted); }
.card h3{ font-family:var(--display); }
.card p{ font-size:14px; color:var(--muted); margin-top:auto; }

/* page-header pattern used on inner pages */
.pagehead{ padding: 64px 0 44px; border-bottom:1px solid var(--line); }
.pagehead .eyebrow{ margin-bottom:16px; }
.pagehead p.lead{ max-width: 60ch; margin-top:14px; }

/* -------------------------------------------------- why / pillars */
.pillars{ display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:var(--line); border:1px solid var(--line); }
.pillar{ background:var(--ink); color:var(--paper); padding:34px 26px; min-height:220px; display:flex; flex-direction:column; justify-content:space-between; }
.pillar .num{ font-family:var(--mono); font-size:12px; color:#a9a7a0; }
.pillar h3{ font-family:var(--display); color:var(--white); font-size:20px; }

/* -------------------------------------------------- clients */
.logos{ display:flex; flex-wrap:wrap; gap:1px; background:var(--line); border:1px solid var(--line); }
.logos span{
  background:var(--paper); flex:1 1 150px; min-width:150px;
  display:flex; align-items:center; justify-content:center;
  padding:26px 16px; font-family:var(--mono); font-size:13px; letter-spacing:.04em; color:var(--ink-soft);
  text-align:center;
}

/* -------------------------------------------------- about / bios */
.bio{ display:grid; grid-template-columns: 120px 1fr; gap:24px; padding:28px 0; border-top:1px solid var(--line); }
.bio:last-child{ border-bottom:1px solid var(--line); }
.bio .avatar{
  width:120px; height:120px; border:1px solid var(--line); background:var(--paper-alt);
  display:flex; align-items:center; justify-content:center;
  font-family:var(--mono); font-size:11px; color:var(--muted); text-align:center;
}
.bio h3{ margin-bottom:2px; }
.bio .role{ font-family:var(--mono); font-size:12px; color:var(--muted); text-transform:uppercase; letter-spacing:.08em; margin-bottom:10px; display:block; }
.bio p{ color:var(--ink-soft); font-size:15px; max-width:70ch; }

/* -------------------------------------------------- contact */
.contact-grid{ display:grid; grid-template-columns: 1.1fr .9fr; gap:56px; }
.field{ margin-bottom:20px; }
.field label{ font-family:var(--mono); font-size:11px; letter-spacing:.08em; text-transform:uppercase; color:var(--muted); display:block; margin-bottom:8px; }
.field input, .field textarea{
  width:100%; border:1px solid var(--line); background:var(--paper);
  padding:12px 14px; font-family:var(--body); font-size:14px; color:var(--ink);
}
.field textarea{ min-height:110px; resize:vertical; }
.field input:focus, .field textarea:focus{ border-color:var(--ink); }
.contact-info li{ list-style:none; display:flex; gap:14px; padding:16px 0; border-top:1px solid var(--line); font-size:14px; }
.contact-info li:last-of-type{ border-bottom:1px solid var(--line); }
.contact-info .tag{ font-family:var(--mono); font-size:11px; color:var(--muted); text-transform:uppercase; letter-spacing:.06em; width:90px; flex:none; }
.mapbox{ margin-top:24px; border:1px solid var(--line); aspect-ratio:16/10; background:var(--paper-alt); display:flex; align-items:center; justify-content:center; font-family:var(--mono); font-size:12px; color:var(--muted); }

/* -------------------------------------------------- footer */
footer{ background:var(--ink); color:var(--paper); padding:56px 0 28px; }
footer .wrap{ display:grid; grid-template-columns: 1.3fr 1fr 1fr; gap:40px; }
footer h4{ font-family:var(--mono); font-size:12px; letter-spacing:.1em; text-transform:uppercase; color:#a9a7a0; margin-bottom:16px; }
footer .brand img{ filter: invert(1); height:30px; }
footer p{ color:#c9c7c0; font-size:14px; max-width:38ch; margin-top:14px; }
footer ul{ list-style:none; display:flex; flex-direction:column; gap:10px; }
footer a{ font-size:14px; color:#c9c7c0; }
footer a:hover{ color:var(--paper); }
.footer-bottom{
  max-width:var(--maxw); margin:40px auto 0; padding:20px 32px 0; border-top:1px solid #3a3a37;
  display:flex; justify-content:space-between; font-family:var(--mono); font-size:11px; color:#8a8883; flex-wrap:wrap; gap:10px;
}

/* -------------------------------------------------- responsive */
@media (max-width: 860px){
  .hero .wrap{ grid-template-columns:1fr; }
  .hero-figure{ aspect-ratio:16/9; }
  .grid{ grid-template-columns: repeat(2,1fr); }
  .pillars{ grid-template-columns:1fr; }
  .contact-grid{ grid-template-columns:1fr; }
  footer .wrap{ grid-template-columns:1fr; }
  .navlinks{ display:none; }
}
@media (max-width: 520px){
  .grid{ grid-template-columns: 1fr; }
  .bio{ grid-template-columns:1fr; }
}