:root {
  --coal: #0d0d0b;
  --carbon: #161614;
  --graphite: #1e1e1a;
  --ash: #2e2e28;
  --ember: #b56218;
  --flame: #b56218;
  --glow: #ffb366;
  --cream: #f5f0e8;
  --warm-white: #faf7f2;
  --muted: #8a8578;
  --green: #4a9668;
  --steel: #5a7a8a;
}

*, *::before, *::after { 
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html { scroll-behavior: smooth; }

body {
  background: var(--coal);
  color: var(--cream);
  font-family: 'Barlow', sans-serif;
  font-weight: 300;
  line-height: 1.65;
  overflow-x: hidden;
}

/* ─── NAV ─── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 3rem;
  background: rgba(13,13,11,0.95);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(232,89,12,0.15);
  transition: padding 0.3s;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
}
.nav-logo img {
  height: 55px;
  opacity: 0.95;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
  align-items: center;
}
.nav-links a {
  font-family: 'Barlow Condensed', sans-serif;
  font-weight: 600;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
  white-space: nowrap;
}
.nav-links a:hover { color: var(--flame); }

.nav-flags {
  font-size: 1.1rem;
  opacity: 0.7;
  flex-shrink: 0;
}

/* ─── HAMBURGER ─── */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
  z-index: 300;
  flex-shrink: 0;
}
.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--cream);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
  transform-origin: center;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ─── MOBILE MENU OVERLAY ─── */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 150;
  background: rgba(13,13,11,0.98);
  backdrop-filter: blur(20px);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}
.mobile-menu.open {
  opacity: 1;
  pointer-events: all;
}
.mobile-menu ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  width: 100%;
}
.mobile-menu ul li {
  width: 100%;
  text-align: center;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.mobile-menu ul li:first-child {
  border-top: 1px solid rgba(255,255,255,0.05);
}
.mobile-menu ul a {
  display: block;
  padding: 1.15rem 2rem;
  font-family: 'Barlow Condensed', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cream);
  text-decoration: none;
  transition: color 0.2s, background 0.2s;
}
.mobile-menu ul a:hover,
.mobile-menu ul a:active {
  color: var(--flame);
  background: rgba(232,89,12,0.06);
}
.mobile-menu-flags {
  margin-top: 2rem;
  font-size: 1.5rem;
  opacity: 0.5;
}
.mobile-menu-brand {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1.8rem;
  letter-spacing: 0.1em;
  color: var(--ember);
  margin-bottom: 2rem;
}

/* ─── HERO ─── */
.hero {
  position: relative;
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 80% at 70% 50%, rgba(232,89,12,0.12) 0%, transparent 70%),
    linear-gradient(180deg, var(--coal) 0%, var(--carbon) 100%);
}
.hero-thermal {
  position: absolute;
  right: 0; top: 0; bottom: 0;
  width: 52%;
  overflow: hidden;
}
.hero-thermal img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0.5;
  filter: saturate(1.3);
}
.hero-thermal::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--coal) 0%, rgba(13,13,11,0.2) 55%, transparent 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  padding: 9rem 3rem 6rem 5rem;
  max-width: 660px;
}
.hero-eyebrow {
  font-family: 'Barlow Condensed', sans-serif;
  font-weight: 600;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ember);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.hero-eyebrow::before {
  content: '';
  display: block;
  width: 2rem; height: 1px;
  background: var(--ember);
}
.hero-title {
  font-family: 'DM Serif Display', serif;
  font-size: clamp(2.4rem, 5.5vw, 4.8rem);
  line-height: 1.02;
  color: var(--warm-white);
  margin-bottom: 1.5rem;
}
.hero-title em { font-style: italic; color: var(--flame); }

.hero-sub {
  font-size: 1.05rem;
  color: rgba(245,240,232,0.72);
  max-width: 500px;
  margin-bottom: 3rem;
  line-height: 1.75;
}
.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--ash);
}
.stat-num {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  color: var(--flame);
  line-height: 1;
}
.stat-label {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 0.3rem;
}
.hero-scale {
  margin-top: 1.6rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--ash);
  border-radius: 16px;
  background: rgba(0,0,0,0.18);
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 0.9rem;
}
.hero-scale .scale-label {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(245,240,232,0.70);
  margin-right: 0.2rem;
}
.hero-scale .scale-item {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: rgba(245,240,232,0.78);
  white-space: nowrap;
}
.hero-scale .dot { color: rgba(245,240,232,0.35); }

/* ─── MARQUEE ─── */
.marquee-band {
  background: var(--ember);
  padding: 0.85rem 0;
  overflow: hidden;
  white-space: nowrap;
}
.marquee-inner {
  display: inline-flex;
  gap: 3rem;
  animation: marquee 24s linear infinite;
}
.marquee-inner span {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 1rem;
  letter-spacing: 0.15em;
  color: var(--coal);
}
@keyframes marquee {
  0%   { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

/* ─── SECTION BASE ─── */
section { padding: 6rem 5rem; }

.section-eyebrow {
  font-family: 'Barlow Condensed', sans-serif;
  font-weight: 600;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ember);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.section-eyebrow::before {
  content: '';
  display: block;
  width: 2rem; height: 1px;
  background: var(--ember);
}
.section-title {
  font-family: 'DM Serif Display', serif;
  font-size: clamp(1.8rem, 3.5vw, 3rem);
  line-height: 1.1;
  color: var(--warm-white);
  margin-bottom: 1.5rem;
}
.section-body {
  font-size: 1rem;
  color: rgba(245,240,232,0.65);
  max-width: 640px;
  line-height: 1.8;
}

/* ─── CHARGE SECTION ─── */
.charge-section { background: var(--carbon); }
.charge-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
  margin-top: 3rem;
}
.charge-card {
  background: var(--graphite);
  border: 1px solid var(--ash);
  padding: 2.5rem 2rem;
  position: relative;
  transition: border-color 0.2s;
}
.charge-card:hover { border-color: var(--ember); }
.charge-card.primary  { border-left: 3px solid var(--flame); }
.charge-card.secondary { border-left: 3px solid var(--steel); }
.charge-icon { font-size: 2rem; margin-bottom: 1rem; }
.charge-title {
  font-family: 'DM Serif Display', serif;
  font-size: 1.4rem;
  color: var(--warm-white);
  margin-bottom: 0.75rem;
}
.charge-body { font-size: 0.9rem; color: var(--muted); line-height: 1.7; }
.charge-body strong { color: var(--cream); }
.charge-tag {
  display: inline-block;
  margin-top: 1.5rem;
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 0.3rem 0.7rem;
  border: 1px solid;
}
.charge-tag.solar { color: var(--flame); border-color: var(--flame); }
.charge-tag.grid  { color: var(--steel); border-color: var(--steel); }

/* ─── MATERIALS ─── */
.materials-section { background: var(--coal); }
.materials-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 2.25rem;
}
.materials-col {
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 18px;
  padding: 1.5rem;
}
.materials-col-title {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 1.15rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ember);
  margin-bottom: 0.35rem;
}
.materials-col-sub {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-bottom: 0.9rem;
}
.materials-col-body { color: rgba(255,255,255,0.86); line-height: 1.55; margin: 0.6rem 0; }
.materials-photo-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1.5rem;
}
.materials-photo {
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(0,0,0,0.2);
}
.materials-photo img {
  width: 100%; height: 260px;
  object-fit: cover; display: block;
  filter: sepia(0.08) contrast(1.02);
}
.materials-photo figcaption {
  padding: 0.75rem 1rem;
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  background: rgba(0,0,0,0.35);
}
.materials-bullets { margin: 1rem 0 0 1.1rem; color: rgba(255,255,255,0.84); }
.materials-bullets li { margin: 0.4rem 0; }

/* ─── FIELD VALIDATION ─── */
.field-section { background: var(--carbon); }
.field-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
  margin-top: 3rem;
}
.charts-panel {
  background: var(--graphite);
  border: 1px solid var(--ash);
  padding: 1.5rem;
}
.charts-panel img { width: 100%; display: block; }
.charts-caption {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 1rem;
  text-align: center;
}
.feature-cards { display: flex; flex-direction: column; gap: 1.2rem; }
.feature-grid { display: flex; flex-direction: column; gap: 1.2rem; margin-top: 2rem; }
.feature-card {
  background: var(--graphite);
  border: 1px solid var(--ash);
  border-left: 3px solid var(--ember);
  padding: 1.4rem;
  transition: border-color 0.2s, background 0.2s;
}
.feature-card:hover { background: var(--ash); border-left-color: var(--flame); }
.feature-title {
  font-family: 'Barlow Condensed', sans-serif;
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--cream);
  margin-bottom: 0.35rem;
}
.feature-body { font-size: 0.85rem; color: var(--muted); line-height: 1.65; }

/* ─── GATEWAY ─── */
.gateway-section { background: var(--graphite); }
.gateway-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
  margin-top: 3rem;
}
.gateway-flow { display: flex; flex-direction: column; gap: 0; }
.flow-step {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--ash);
}
.flow-step:last-child { border-bottom: none; }
.flow-icon { font-size: 1.8rem; min-width: 2.5rem; text-align: center; margin-top: 0.1rem; }
.flow-label {
  font-family: 'Barlow Condensed', sans-serif;
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ember);
  margin-bottom: 0.3rem;
}
.flow-text { font-size: 0.88rem; color: var(--muted); line-height: 1.65; }
.flow-text strong { color: var(--cream); }
.gateway-card {
  background: var(--ash);
  border: 1px solid rgba(232,89,12,0.3);
  padding: 2rem;
  border-radius: 8px;
  margin-bottom: 2rem;
}
.gateway-title {
  font-family: 'Barlow Condensed', sans-serif;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ember);
  margin-bottom: 0.75rem;
}
.gateway-body { font-size: 1rem; color: rgba(245,240,232,0.8); }

/* ─── PRODUCTS ─── */
.products-section { background: var(--coal); }
.products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-top: 3rem;
}
.product-card {
  background: var(--graphite);
  border: 1px solid var(--ash);
  padding: 2rem 1.5rem;
  transition: transform 0.2s, border-color 0.2s;
}
.product-card:hover { transform: translateY(-4px); border-color: var(--ember); }
.product-kwh {
  font-family: 'Bebas Neue', sans-serif;
  font-size: 3rem;
  color: var(--ember);
  line-height: 1;
}
.product-unit {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
}
.product-name {
  font-family: 'DM Serif Display', serif;
  font-size: 1.2rem;
  color: var(--warm-white);
  margin-bottom: 0.6rem;
}
.product-desc { font-size: 0.8rem; color: var(--muted); line-height: 1.6; margin-bottom: 1.5rem; }
.product-status {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  padding: 0.25rem 0.6rem;
  border: 1px solid;
  display: inline-block;
}
.status-trial  { color: var(--green); border-color: var(--green); }
.status-scaling { color: var(--flame); border-color: var(--flame); }
.status-dev    { color: var(--muted); border-color: var(--muted); }

/* ─── MARKET ─── */
.market-section { background: var(--carbon); }
.market-grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: 5rem;
  align-items: center;
  margin-top: 3rem;
}
.context-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.context-stat {
  text-align: center;
  padding: 1.5rem 1rem;
  border: 1px solid var(--ash);
  background: var(--graphite);
}
.context-num {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(2rem, 3vw, 2.8rem);
  color: var(--flame);
  display: block;
}
.context-label {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 0.3rem;
}

/* ─── COMPARE ─── */
.compare-section { background: var(--coal); }
.compare-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 3rem;
  font-size: 0.88rem;
}
.compare-table th {
  font-family: 'Barlow Condensed', sans-serif;
  font-weight: 700;
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--muted);
  text-align: left;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--ash);
}
.compare-table td {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid rgba(46,46,40,0.5);
  color: rgba(245,240,232,0.6);
}
.compare-table tr.highlight { background: rgba(232,89,12,0.08); }
.compare-table tr.highlight td { color: var(--cream); border-left: 2px solid var(--ember); }
.compare-table td:first-child { font-weight: 500; color: var(--cream); }

/* ─── TEAM ─── */
.team-section { background: var(--graphite); }
.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 3rem;
}
.team-card {
  background: var(--carbon);
  border: 1px solid var(--ash);
  padding: 2.5rem 2rem;
}
.team-photo {
  width: 140px; height: 140px;
  border-radius: 12px;
  border: 2px solid var(--ash);
  object-fit: cover;
  margin-bottom: 1.25rem;
  background: var(--graphite);
  display: block;
}
.team-name {
  font-family: 'DM Serif Display', serif;
  font-size: 1.2rem;
  color: var(--warm-white);
  margin-bottom: 0.25rem;
}
.team-role {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ember);
  margin-bottom: 1rem;
}
.team-bio { font-size: 0.83rem; color: var(--muted); line-height: 1.7; }

/* ─── PARTNERS ─── */
.partners-section { background: var(--coal); }
.partners-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-top: 3rem;
}
.partner-card {
  background: var(--graphite);
  border: 1px solid var(--ash);
  padding: 2.5rem;
}
.partner-label {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ember);
  margin-bottom: 0.75rem;
}
.partner-name {
  font-family: 'DM Serif Display', serif;
  font-size: 1.4rem;
  color: var(--warm-white);
  margin-bottom: 1rem;
}
.partner-desc { font-size: 0.88rem; color: var(--muted); line-height: 1.7; }

/* ─── CONTACT ─── */
.contact-section {
  background: var(--ember);
  padding: 6rem 5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.contact-title {
  font-family: 'DM Serif Display', serif;
  font-size: clamp(1.6rem, 4vw, 3.2rem);
  color: var(--coal);
  max-width: 700px;
  margin-bottom: 1rem;
}
.contact-sub { font-size: 1rem; color: rgba(13,13,11,0.6); margin-bottom: 2.5rem; }
.contact-btn {
  display: inline-block;
  padding: 1rem 2.5rem;
  background: var(--coal);
  color: var(--cream);
  font-family: 'Barlow Condensed', sans-serif;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  text-decoration: none;
  transition: background 0.2s;
}
.contact-btn:hover { background: var(--graphite); }
.contact-locations {
  display: flex;
  gap: 3rem;
  margin-top: 2.5rem;
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  color: rgba(13,13,11,0.6);
  flex-wrap: wrap;
  justify-content: center;
}

/* ─── FOOTER ─── */
footer {
  background: var(--coal);
  border-top: 1px solid var(--ash);
  padding: 2rem 5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.footer-copy {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.footer-ip {
  font-family: 'Barlow Condensed', sans-serif;
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.05em;
}

/* ─── ANIMATIONS ─── */
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.fade-up.visible { opacity: 1; transform: translateY(0); }

/* ─── STATS ROW ─── */
.stats-row {
  background: var(--graphite);
  border: 1px solid var(--ash);
  padding: 2rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  text-align: center;
  margin-top: 2rem;
}

/* ════════════════════════════════
   RESPONSIVE BREAKPOINTS
   ════════════════════════════════ */

/* ─── Tablet (≤1024px) ─── */
@media (max-width: 1024px) {
  nav { padding: 1rem 2rem; }
  .nav-links { gap: 1.25rem; }
  .nav-links a { font-size: 0.7rem; }
  section { padding: 5rem 3rem; }
  .hero-content { padding: 8rem 2rem 5rem 3rem; }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .market-grid { gap: 3rem; }
  .gateway-grid { gap: 3rem; }
  .field-grid { gap: 3rem; }
}

/* ─── Mobile (≤768px) ─── */
@media (max-width: 768px) {
  /* Nav */
  nav { padding: 0.9rem 1.25rem; }
  .nav-links { display: none !important; }
  .nav-flags { display: none; }
  .hamburger { display: flex; }
  .mobile-menu { display: flex; }
  .nav-logo img { height: 44px; }

  /* Hero */
  .hero { grid-template-columns: 1fr; min-height: 100svh; }
  .hero-thermal { display: none; }
  .hero-content {
    padding: 7rem 1.5rem 4rem;
    max-width: 100%;
  }
  .hero-stats { grid-template-columns: 1fr 1fr; gap: 1rem; }
  .hero-stats > div:last-child {
    grid-column: 1 / -1;
  }

  /* Sections */
  section { padding: 4rem 1.5rem; }
  .contact-section { padding: 4rem 1.5rem; }

  /* Grids → single column */
  .charge-grid,
  .materials-two-col,
  .gateway-grid,
  .field-grid,
  .market-grid,
  .partners-grid,
  .team-grid,
  .materials-photo-row { grid-template-columns: 1fr; gap: 1.5rem; }

  /* Products: 2-col on mobile */
  .products-grid { grid-template-columns: 1fr 1fr; gap: 1rem; }
  .product-card { padding: 1.5rem 1rem; }
  .product-kwh { font-size: 2.2rem; }

  /* Context stats: keep 2-col */
  .context-stats { grid-template-columns: 1fr 1fr; gap: 1rem; }

  /* Stats row */
  .stats-row { grid-template-columns: 1fr; gap: 1.25rem; }

  /* Compare table — scroll horizontally */
  .compare-section { padding: 4rem 0; }
  .compare-section > * { padding-left: 1.5rem; padding-right: 1.5rem; }
  .compare-table-wrap { overflow-x: auto; padding: 0 1.5rem; }
  .compare-table { min-width: 560px; }

  /* Contact */
  .contact-locations { flex-direction: column; gap: 0.5rem; align-items: center; }

  /* Footer */
  footer { padding: 2rem 1.5rem; flex-direction: column; align-items: flex-start; }

  /* Field grid */
  .field-grid { gap: 2rem; }

  /* Gateway */
  .gateway-grid { gap: 2rem; }
}

/* ─── Small phones (≤480px) ─── */
@media (max-width: 480px) {
  .hero-title { font-size: 2.2rem; }
  .hero-sub { font-size: 0.95rem; }
  .hero-stats { grid-template-columns: 1fr 1fr; }
  .hero-scale { padding: 0.75rem; gap: 0.4rem 0.6rem; }
  .hero-scale .scale-item { font-size: 0.78rem; }

  section { padding: 3rem 1.25rem; }
  .contact-section { padding: 3rem 1.25rem; }

  .products-grid { grid-template-columns: 1fr; }
  .context-stats { grid-template-columns: 1fr 1fr; }

  .team-photo { width: 110px; height: 110px; }

  .compare-table th,
  .compare-table td { padding: 0.75rem 1rem; font-size: 0.82rem; }

  .materials-photo img { height: 200px; }
}

#btn-back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--ash);
  background: var(--ember);
  color: var(--coal);
  font-size: 20px;
  cursor: pointer;
  z-index: 999;

  display: flex;
  align-items: center;
  justify-content: center;

  opacity: 0;
  pointer-events: none;

  box-shadow: 0 6px 20px rgba(0,0,0,0.35);
  transition: all 0.3s ease;
}

#btn-back-to-top:hover {
  background: var(--flame);
  transform: translateY(-3px);
}

/* SHOW */
#btn-back-to-top.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* HIDE */
#btn-back-to-top.hide {
  opacity: 0;
  transform: translateY(20px);
}