/* ============================================================
   VELTORA Mounting Technologies — Design System
   Expanding the Surface of Solar
   ============================================================ */

:root {
  /* Institutional Color Palette (Brand Guide p.11) */
  --navy:        #071B2E;  /* Infrastructure Navy — primary */
  --navy-2:      #0A2236;  /* lifted navy for panels */
  --graphite:    #20262C;  /* Graphite Steel — primary */
  --titanium:    #8C98A4;  /* Titanium — secondary text */
  --offwhite:    #F4F1EA;  /* Off-White Grid — secondary */
  --teal:        #00A7A5;  /* Electric Teal — accent */
  --teal-bright: #19C9C6;  /* hover/active teal */
  --alloy:       #D7A84F;  /* Solar Alloy — financial accent only */
  --carbon:      #050708;  /* Carbon Black — dark */

  --line:        rgba(140, 152, 164, 0.18);
  --line-strong: rgba(140, 152, 164, 0.32);
  --panel:       rgba(255, 255, 255, 0.025);
  --panel-2:     rgba(255, 255, 255, 0.04);

  /* Typography */
  --display: "Space Grotesk", system-ui, sans-serif;
  --body:    "Inter", system-ui, sans-serif;
  --mono:    "JetBrains Mono", ui-monospace, monospace;

  /* Layout */
  --maxw: 1200px;
  --pad: clamp(20px, 5vw, 64px);
  --radius: 4px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Reset ---------- */
*, *::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; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  font-family: var(--body);
  background: var(--navy);
  color: var(--offwhite);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* ---------- Engineering grid background ---------- */
.grid-bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 64px 64px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 64px 64px;
  opacity: 0.35;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 30%, #000 40%, transparent 100%);
  pointer-events: none;
}
.dot-bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  background: radial-gradient(var(--line-strong) 1px, transparent 1.4px) 0 0 / 28px 28px;
  opacity: 0.25;
  pointer-events: none;
}

/* ---------- Typography helpers ---------- */
.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--teal);
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
}
.eyebrow::before {
  content: "";
  width: 1.6em; height: 1px;
  background: var(--teal);
  display: inline-block;
}
/* Section number marker (brand leitsystem, Guide p.2/4/6) */
.secnum {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--teal);
  display: inline-block;
  margin-bottom: 0.4rem;
  opacity: 0.85;
}

h1, h2, h3 { font-family: var(--display); font-weight: 700; line-height: 1.04; letter-spacing: -0.01em; }

.h-xl { font-size: clamp(2.6rem, 7vw, 5.4rem); text-transform: uppercase; letter-spacing: -0.02em; }
.h-lg { font-size: clamp(2rem, 4.5vw, 3.4rem); text-transform: uppercase; }
.h-md { font-size: clamp(1.4rem, 2.6vw, 2rem); }

.lead {
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  color: var(--titanium);
  max-width: 56ch;
}
.muted { color: var(--titanium); }
.teal { color: var(--teal); }

/* ---------- Layout primitives ---------- */
.wrap { max-width: var(--maxw); margin-inline: auto; padding-inline: var(--pad); }
section { padding-block: clamp(64px, 10vw, 130px); position: relative; }
.section-line { border-top: 1px solid var(--line); }

.stack > * + * { margin-top: 1.2rem; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(14px);
  background: rgba(7, 27, 46, 0.72);
  border-bottom: 1px solid var(--line);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 70px;
  max-width: var(--maxw); margin-inline: auto; padding-inline: var(--pad);
}
.brand { display: flex; align-items: center; gap: 0.7rem; font-family: var(--display); font-weight: 700; letter-spacing: 0.12em; font-size: 1.12rem; text-transform: uppercase; }
.brand .mark { width: 30px; height: 30px; }
.brand small { font-family: var(--body); font-weight: 400; font-size: 0.62rem; letter-spacing: 0.18em; color: var(--teal); text-transform: uppercase; display: block; margin-top: 2px; }
.nav-links { display: flex; align-items: center; gap: 1.6rem; font-size: 0.92rem; }
.nav-links a { color: var(--titanium); transition: color 0.2s; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--offwhite); }
.nav-toggle { display: none; background: none; border: 1px solid var(--line-strong); color: var(--offwhite); width: 42px; height: 38px; border-radius: var(--radius); cursor: pointer; }
.nav-toggle svg { margin: auto; }

@media (max-width: 880px) {
  .nav-links {
    position: fixed; inset: 70px 0 auto 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: var(--navy-2); border-bottom: 1px solid var(--line);
    padding: var(--pad); transform: translateY(-120%); transition: transform 0.35s var(--ease);
  }
  .nav-links.open { transform: translateY(0); }
  .nav-links a { padding: 0.7rem 0; width: 100%; border-bottom: 1px solid var(--line); }
  .nav-links .btn { margin-top: 1rem; }
  .nav-toggle { display: grid; place-items: center; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.55em;
  font-family: var(--mono); font-size: 0.82rem; letter-spacing: 0.06em;
  text-transform: uppercase; font-weight: 500;
  padding: 0.85em 1.5em; border-radius: var(--radius);
  border: 1px solid transparent; cursor: pointer;
  transition: transform 0.2s var(--ease), background 0.2s, border-color 0.2s, color 0.2s;
}
.btn-primary { background: var(--teal); color: var(--navy); }
.btn-primary:hover { background: var(--teal-bright); transform: translateY(-2px); }
.btn-ghost { border-color: var(--line-strong); color: var(--offwhite); }
.btn-ghost:hover { border-color: var(--teal); color: var(--teal); transform: translateY(-2px); }
.btn .arrow { transition: transform 0.2s var(--ease); }
.btn:hover .arrow { transform: translateX(3px); }

.btn-row { display: flex; flex-wrap: wrap; gap: 0.9rem; }

/* ---------- Hero ---------- */
.hero { padding-block: clamp(70px, 12vw, 150px) clamp(60px, 9vw, 110px); position: relative; overflow: hidden; }
.hero .wrap { position: relative; z-index: 2; }
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: clamp(2rem, 5vw, 5rem); align-items: center; }
.hero h1 { margin: 1.2rem 0 1.4rem; }
.hero .claim {
  font-family: var(--mono); font-size: 0.9rem; letter-spacing: 0.12em;
  color: var(--teal); text-transform: uppercase; margin-bottom: 2rem;
}
.hero-stats { display: flex; gap: 2.4rem; margin-top: 2.6rem; flex-wrap: wrap; }
.hero-stats .stat .n { font-family: var(--display); font-size: 1.9rem; font-weight: 700; }
.hero-stats .stat .l { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--titanium); }

@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; } .hero-visual { order: -1; max-width: 420px; } }

/* ---------- Photo hero (Schletter/K2-style full-bleed) ---------- */
.hero-photo {
  position: relative;
  min-height: clamp(560px, 82vh, 860px);
  display: flex;
  align-items: flex-end;
  padding-block: 0 clamp(48px, 7vw, 96px);
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}
.hero-photo__img {
  position: absolute; inset: 0; z-index: 0;
  background-image: url("../assets/silo-pv-hero.jpg");
  background-size: cover; background-position: 72% center;
}
.hero-photo__scrim {
  position: absolute; inset: 0; z-index: 1;
  background:
    linear-gradient(90deg, rgba(7,27,46,0.96) 0%, rgba(7,27,46,0.82) 34%, rgba(7,27,46,0.30) 62%, rgba(7,27,46,0.12) 100%),
    linear-gradient(0deg, rgba(7,27,46,0.85) 0%, rgba(7,27,46,0.10) 40%, rgba(7,27,46,0) 70%);
}
/* fine engineering grid over the photo keeps brand language */
.hero-photo__grid {
  position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background:
    linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 64px 64px,
    linear-gradient(90deg, var(--line) 1px, transparent 1px) 0 0 / 64px 64px;
  opacity: 0.20;
  mask-image: linear-gradient(90deg, #000 0%, #000 45%, transparent 80%);
}
.hero-photo .wrap { position: relative; z-index: 2; width: 100%; }
.hero-photo__inner { max-width: 640px; }
.hero-photo h1 { margin: 1.1rem 0 1.3rem; }
.hero-photo .claim { font-family: var(--mono); font-size: 0.9rem; letter-spacing: 0.12em; color: var(--teal); text-transform: uppercase; margin-bottom: 1.8rem; }
.hero-photo .lead { color: #D8DEE6; }
/* annotation tag pinned to the silo */
.hero-photo__tag {
  position: absolute; z-index: 2; right: clamp(16px, 6vw, 90px); bottom: clamp(120px, 20vh, 200px);
  font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.1em; color: var(--offwhite);
  border: 1px solid var(--teal); border-left-width: 2px; background: rgba(7,27,46,0.82);
  backdrop-filter: blur(6px); padding: 0.6rem 0.85rem; border-radius: var(--radius);
  display: flex; flex-direction: column; gap: 3px; box-shadow: 0 8px 30px rgba(0,0,0,0.3);
}
.hero-photo__tag b { color: var(--teal); font-weight: 500; }
.hero-photo__tag span { color: var(--titanium); }
@media (max-width: 720px) {
  .hero-photo__tag { display: none; }
  .hero-photo__img { background-position: 66% center; }
  .hero-photo__scrim {
    background:
      linear-gradient(0deg, rgba(7,27,46,0.97) 0%, rgba(7,27,46,0.82) 42%, rgba(7,27,46,0.42) 100%);
  }
}
.hero-photo .hero-stats { margin-top: 2.4rem; }
.hero-photo .hero-stats .stat .n { color: var(--offwhite); }

/* ---------- Partner section (RaiffeisenVolt) ---------- */
.partner { position: relative; overflow: hidden; }
.partner-grid { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: clamp(2rem, 5vw, 4.5rem); align-items: center; }
@media (max-width: 850px) { .partner-grid { grid-template-columns: 1fr; } }
.partner-logo-card {
  background: var(--offwhite); border-radius: var(--radius);
  padding: clamp(2rem, 5vw, 3.5rem); display: flex; align-items: center; justify-content: center;
  border: 1px solid var(--line); position: relative;
}
.partner-logo-card::before, .partner-logo-card::after {
  content: ""; position: absolute; width: 12px; height: 12px; border-color: var(--teal);
}
.partner-logo-card::before { top: 10px; left: 10px; border-top: 2px solid; border-left: 2px solid; }
.partner-logo-card::after { bottom: 10px; right: 10px; border-bottom: 2px solid; border-right: 2px solid; }
.partner-logo-card img { max-width: 320px; width: 100%; height: auto; }
.partner-badge {
  font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--teal); display: inline-block; margin-bottom: 0.4rem;
}
.partner-stats { display: flex; gap: 2.4rem; margin-top: 2rem; flex-wrap: wrap; }
.partner-stats .stat .n { font-family: var(--display); font-weight: 700; font-size: 1.7rem; color: var(--offwhite); line-height: 1; }
.partner-stats .stat .l { font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--titanium); margin-top: 0.4rem; max-width: 20ch; }

/* ---------- Market facts (big numbers) ---------- */
.facts-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
@media (max-width: 820px) { .facts-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 460px) { .facts-grid { grid-template-columns: 1fr; } }
.fact { background: var(--navy); padding: 2rem 1.6rem; transition: background 0.25s; }
.fact:hover { background: var(--navy-2); }
.fact-n { font-family: var(--display); font-weight: 700; font-size: clamp(1.9rem, 3.4vw, 2.9rem); line-height: 1; letter-spacing: -0.02em; color: var(--offwhite); }
.fact-l { font-family: var(--body); font-size: 0.9rem; color: var(--titanium); margin-top: 0.7rem; max-width: 24ch; }

/* ---------- Proof / reference photo band ---------- */
.proof-figure {
  position: relative; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; background: var(--navy-2);
}
.proof-figure img { width: 100%; height: 100%; object-fit: cover; display: block; }
.proof-figure figcaption {
  position: absolute; left: 0; bottom: 0; right: 0;
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  padding: 1rem 1.2rem;
  background: linear-gradient(0deg, rgba(5,7,8,0.9), rgba(5,7,8,0));
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.06em; color: var(--offwhite);
}
.proof-figure figcaption .teal { color: var(--teal); }

/* ---------- Cards ---------- */
.cards { display: grid; gap: 1.2rem; }
.cards-3 { grid-template-columns: repeat(3, 1fr); }
.cards-2 { grid-template-columns: repeat(2, 1fr); }
.cards-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .cards-3, .cards-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .cards-2, .cards-3, .cards-4 { grid-template-columns: 1fr; } }

.card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.8rem 1.6rem;
  position: relative; transition: border-color 0.25s, background 0.25s, transform 0.25s var(--ease);
}
.card:hover { border-color: var(--line-strong); background: var(--panel-2); transform: translateY(-3px); }
.card .num { font-family: var(--mono); font-size: 0.72rem; color: var(--teal); letter-spacing: 0.12em; }
.card h3 { font-family: var(--display); font-size: 1.15rem; margin: 0.8rem 0 0.6rem; text-transform: none; letter-spacing: 0; }
.card p { font-size: 0.95rem; color: var(--titanium); }
.card .ico { color: var(--teal); margin-bottom: 1rem; }

/* corner ticks */
.ticked::before, .ticked::after {
  content: ""; position: absolute; width: 9px; height: 9px; border-color: var(--teal); opacity: 0.55;
}
.ticked::before { top: -1px; left: -1px; border-top: 1px solid; border-left: 1px solid; }
.ticked::after { bottom: -1px; right: -1px; border-bottom: 1px solid; border-right: 1px solid; }

/* ---------- Split / feature rows ---------- */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 5vw, 4.5rem); align-items: center; }
@media (max-width: 850px) { .split { grid-template-columns: 1fr; } }

.spec-list { list-style: none; display: grid; gap: 0; border-top: 1px solid var(--line); }
.spec-list li { display: flex; gap: 1rem; padding: 1.1rem 0; border-bottom: 1px solid var(--line); align-items: baseline; }
.spec-list .k { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--teal); min-width: 130px; }
.spec-list .v { color: var(--offwhite); font-size: 0.98rem; }

/* ---------- Process steps ---------- */
.steps { counter-reset: step; display: grid; gap: 0; }
.step {
  display: grid; grid-template-columns: 80px 1fr; gap: 1.6rem;
  padding: 1.8rem 0; border-top: 1px solid var(--line); align-items: start;
}
.step:last-child { border-bottom: 1px solid var(--line); }
.step .idx { counter-increment: step; font-family: var(--mono); color: var(--teal); font-size: 0.9rem; letter-spacing: 0.1em; }
.step .idx::before { content: "0" counter(step); }
.step h3 { font-family: var(--display); font-size: 1.2rem; text-transform: none; letter-spacing: 0; margin-bottom: 0.4rem; }
.step p { color: var(--titanium); font-size: 0.96rem; }
@media (max-width: 600px) { .step { grid-template-columns: 1fr; gap: 0.4rem; } }

/* ---------- Audience pills ---------- */
.aud { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 1rem; }
.aud .a { border: 1px solid var(--line); border-radius: var(--radius); padding: 1.3rem; transition: border-color 0.25s, transform 0.25s var(--ease); }
.aud .a:hover { border-color: var(--teal); transform: translateY(-2px); }
.aud .a .ico { color: var(--teal); }
.aud .a strong { font-family: var(--display); display: block; margin: 0.7rem 0 0.3rem; font-weight: 600; }
.aud .a span { font-size: 0.88rem; color: var(--titanium); }

/* ---------- Two-column compare (Avoid / Replace) ---------- */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
@media (max-width: 700px) { .compare { grid-template-columns: 1fr; } }
.compare > div { padding: 2rem; }
.compare .col-no { border-right: 1px solid var(--line); }
@media (max-width: 700px) { .compare .col-no { border-right: none; border-bottom: 1px solid var(--line); } }
.compare h4 { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 1.2rem; }
.compare .col-no h4 { color: #C0635E; }
.compare .col-yes h4 { color: var(--teal); }
.compare ul { list-style: none; display: grid; gap: 0.9rem; }
.compare li { display: flex; gap: 0.7rem; font-size: 0.95rem; color: var(--titanium); align-items: baseline; }
.compare .col-no li::before { content: "✕"; color: #C0635E; font-family: var(--mono); }
.compare .col-yes li::before { content: "→"; color: var(--teal); font-family: var(--mono); }

/* ---------- CTA band ---------- */
.cta-band { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--navy-2); }
.cta-band .inner { display: flex; align-items: center; justify-content: space-between; gap: 2rem; flex-wrap: wrap; }
.cta-band h2 { max-width: 22ch; }

/* ---------- Forms ---------- */
.form { display: grid; gap: 1.3rem; grid-template-columns: 1fr 1fr; }
@media (max-width: 700px) { .form { grid-template-columns: 1fr; } }
.field { display: flex; flex-direction: column; gap: 0.4rem; }
.field.full { grid-column: 1 / -1; }
.field label { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--titanium); }
.field input, .field select, .field textarea {
  background: var(--panel); border: 1px solid var(--line-strong); border-radius: var(--radius);
  color: var(--offwhite); padding: 0.85em 1em; font-family: var(--body); font-size: 0.98rem;
  transition: border-color 0.2s;
}
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--teal); }
.field textarea { resize: vertical; min-height: 120px; }
.field select { appearance: none; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); background: var(--navy-2); padding-block: clamp(48px, 7vw, 80px) 2rem; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 2rem; }
@media (max-width: 800px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-grid h5 { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--teal); margin-bottom: 1rem; }
.footer-grid a { color: var(--titanium); font-size: 0.92rem; display: block; padding: 0.3rem 0; transition: color 0.2s; }
.footer-grid a:hover { color: var(--offwhite); }
.footer-claim { font-family: var(--display); font-size: 0.95rem; color: var(--titanium); max-width: 34ch; margin-top: 1rem; }
.footer-bottom { border-top: 1px solid var(--line); margin-top: 3rem; padding-top: 1.6rem; display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.06em; color: var(--titanium); }

/* ---------- Page hero (interior pages) ---------- */
.page-hero { padding-block: clamp(60px, 9vw, 110px) clamp(40px, 6vw, 70px); border-bottom: 1px solid var(--line); }
.page-hero h1 { margin: 1.1rem 0 1.3rem; }

/* ---------- Prose (legal pages) ---------- */
.prose { max-width: 70ch; }
.prose h2 { font-family: var(--display); font-size: 1.4rem; text-transform: none; letter-spacing: 0; margin: 2.4rem 0 0.9rem; }
.prose h3 { font-family: var(--display); font-size: 1.1rem; text-transform: none; margin: 1.6rem 0 0.6rem; }
.prose p, .prose li { color: var(--titanium); font-size: 0.98rem; margin-bottom: 0.8rem; }
.prose ul { padding-left: 1.2rem; margin-bottom: 1rem; }
.prose .ph { color: var(--teal); font-family: var(--mono); font-size: 0.9em; }

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Notes / disclaimers ---------- */
.note { font-family: var(--mono); font-size: 0.76rem; letter-spacing: 0.04em; color: var(--titanium); border-left: 2px solid var(--teal); padding-left: 1rem; }

/* utility */
.mt-0 { margin-top: 0; }
.center { text-align: center; }
.maxw-sm { max-width: 60ch; }