:root {
  --ink: #101820;
  --deep: #071014;
  --muted: #60717c;
  --paper: #f4f1e8;
  --white: #ffffff;
  --line: rgba(16, 24, 32, 0.13);
  --carbon: #193a33;
  --moss: #607d3b;
  --copper: #c17b35;
  --sky: #5d95a8;
  --panel: #e7ece5;
  --shadow: 0 24px 60px rgba(10, 20, 26, 0.18);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  width: 100%;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(18px, 4vw, 56px);
  color: var(--white);
  transition: background 0.2s ease, box-shadow 0.2s ease, color 0.2s ease;
}

.site-header.is-scrolled,
.site-header.is-open {
  color: var(--ink);
  background: rgba(244, 241, 232, 0.95);
  box-shadow: 0 14px 35px rgba(15, 28, 40, 0.1);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 290px;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-size: 0.78rem;
  font-weight: 900;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 0.95rem;
}

.brand small {
  color: currentColor;
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.78;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 0.92rem;
  font-weight: 800;
}

.site-nav a {
  opacity: 0.84;
}

.site-nav a:hover {
  opacity: 1;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid currentColor;
  border-radius: 50%;
  color: inherit;
  background: transparent;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  margin: 4px auto;
  background: currentColor;
}

.hero {
  position: relative;
  display: grid;
  min-height: 92vh;
  overflow: hidden;
  padding: 148px clamp(18px, 6vw, 76px) 48px;
  color: var(--white);
}

.hero-media,
.hero-overlay {
  position: absolute;
  inset: 0;
}

.hero-media {
  background:
    linear-gradient(90deg, rgba(7, 16, 20, 0.78), rgba(7, 16, 20, 0.28)),
    url("https://images.unsplash.com/photo-1466611653911-95081537e5b7?auto=format&fit=crop&w=2200&q=82") center/cover;
  transform: scale(1.02);
}

.hero-overlay {
  background: linear-gradient(180deg, rgba(7, 16, 20, 0.08), rgba(7, 16, 20, 0.86));
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 890px;
  align-self: center;
}

.eyebrow,
.section-kicker {
  margin: 0 0 16px;
  color: var(--copper);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.eyebrow.dark,
.section-kicker {
  color: var(--carbon);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 960px;
  margin-bottom: 22px;
  font-size: 5.7rem;
  line-height: 0.92;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-size: 3.35rem;
  line-height: 1;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 12px;
  font-size: 1.2rem;
  line-height: 1.15;
}

.hero-content p {
  max-width: 720px;
  color: rgba(255, 255, 255, 0.84);
  font-size: 1.2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0 22px;
  font-weight: 900;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button.primary {
  color: #102019;
  background: var(--copper);
}

.button.secondary {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.42);
  background: rgba(255, 255, 255, 0.08);
}

.hero-panel {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-self: end;
  max-width: 880px;
  margin-top: 64px;
  border-top: 1px solid rgba(255, 255, 255, 0.24);
}

.hero-panel div {
  padding: 22px 20px 0 0;
}

.hero-panel strong,
.hero-panel span {
  display: block;
}

.hero-panel strong {
  color: var(--copper);
  font-size: 2.65rem;
  line-height: 1;
}

.hero-panel span {
  max-width: 190px;
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.88rem;
}

.section-band,
.platform,
.value {
  padding: clamp(64px, 9vw, 118px) clamp(18px, 6vw, 76px);
}

.intro {
  background: var(--white);
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.8fr);
  gap: clamp(28px, 6vw, 80px);
  align-items: start;
}

.intro-grid p {
  color: var(--muted);
  font-size: 1.08rem;
}

.section-heading {
  max-width: 850px;
  margin-bottom: 38px;
}

.section-heading.compact {
  max-width: 730px;
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.capability-card {
  min-height: 280px;
  padding: 28px;
  background: var(--paper);
}

.capability-card:nth-child(2),
.capability-card:nth-child(5) {
  background: var(--panel);
}

.capability-card span {
  display: inline-block;
  margin-bottom: 42px;
  color: var(--carbon);
  font-size: 0.82rem;
  font-weight: 900;
}

.capability-card p,
.fuel-copy p,
.value-strip p {
  color: var(--muted);
}

.fuel-systems {
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(0, 1fr);
  gap: clamp(32px, 6vw, 84px);
  padding: clamp(64px, 9vw, 118px) clamp(18px, 6vw, 76px);
  background:
    linear-gradient(90deg, rgba(244, 241, 232, 0.96), rgba(244, 241, 232, 0.84)),
    url("https://images.unsplash.com/photo-1494412519320-aa613dfb7738?auto=format&fit=crop&w=1800&q=80") center/cover;
}

.fuel-copy {
  align-self: start;
}

.fuel-list {
  display: grid;
  gap: 14px;
}

.fuel-list article {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 22px;
  padding: 20px 0;
  border-top: 1px solid var(--line);
}

.fuel-list span {
  color: var(--carbon);
  font-weight: 900;
}

.fuel-list p {
  margin-bottom: 0;
  color: var(--muted);
}

.infrastructure {
  display: grid;
  grid-template-columns: minmax(300px, 0.85fr) minmax(0, 1fr);
  min-height: 680px;
  background: var(--white);
}

.infra-image {
  min-height: 440px;
  background:
    linear-gradient(180deg, rgba(13, 35, 48, 0.05), rgba(13, 35, 48, 0.3)),
    url("https://images.unsplash.com/photo-1513828583688-c52646db42da?auto=format&fit=crop&w=1400&q=82") center/cover;
}

.infra-content {
  align-self: center;
  padding: clamp(48px, 7vw, 96px);
}

.steps {
  display: grid;
  gap: 18px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.steps li {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 18px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.steps strong {
  color: var(--carbon);
}

.steps span {
  color: var(--muted);
}

.value {
  background: var(--paper);
}

.value-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.value-strip article {
  min-height: 230px;
  padding: 26px;
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 18px 48px rgba(21, 35, 48, 0.08);
}

.contact {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 0.72fr);
  gap: clamp(28px, 6vw, 78px);
  padding: clamp(64px, 9vw, 118px) clamp(18px, 6vw, 76px);
  color: var(--white);
  background:
    linear-gradient(135deg, rgba(7, 16, 20, 0.94), rgba(25, 58, 51, 0.92)),
    url("https://images.unsplash.com/photo-1496247749665-49cf5b1022e9?auto=format&fit=crop&w=1800&q=80") center/cover;
}

.contact-copy p {
  max-width: 620px;
  color: rgba(255, 255, 255, 0.78);
}

.contact-list {
  display: grid;
  gap: 12px;
  margin-top: 30px;
  color: rgba(255, 255, 255, 0.88);
  font-weight: 800;
}

.contact-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  align-self: start;
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.contact-form label {
  display: grid;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 900;
}

.contact-form .full {
  grid-column: 1 / -1;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 6px;
  padding: 13px 14px;
  color: var(--white);
  background: rgba(5, 12, 18, 0.32);
  font: inherit;
}

select option {
  color: var(--ink);
}

textarea {
  resize: vertical;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--copper);
  outline: none;
}

.form-note {
  grid-column: 1 / -1;
  min-height: 24px;
  margin: 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.9rem;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 26px clamp(18px, 6vw, 76px);
  color: rgba(255, 255, 255, 0.72);
  background: var(--deep);
}

@media (max-width: 1080px) {
  h1 {
    font-size: 4.5rem;
  }

  h2 {
    font-size: 2.7rem;
  }

  .capability-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 960px) {
  .site-nav {
    position: absolute;
    top: 74px;
    left: 18px;
    right: 18px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 14px;
    border-radius: 8px;
    color: var(--ink);
    background: var(--white);
    box-shadow: var(--shadow);
  }

  .site-header.is-open .site-nav {
    display: flex;
  }

  .site-nav a {
    padding: 14px;
  }

  .nav-toggle {
    display: block;
  }

  .intro-grid,
  .fuel-systems,
  .infrastructure,
  .contact {
    grid-template-columns: 1fr;
  }

  .value-strip {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 14px 18px;
  }

  .brand {
    min-width: 0;
  }

  .brand strong {
    font-size: 0.82rem;
  }

  .brand small {
    font-size: 0.58rem;
  }

  .hero {
    min-height: 890px;
    padding-top: 118px;
  }

  h1 {
    font-size: 3.25rem;
  }

  h2 {
    font-size: 2.15rem;
  }

  .hero-content p {
    font-size: 1.08rem;
  }

  .hero-panel,
  .capability-grid,
  .contact-form {
    grid-template-columns: 1fr;
  }

  .hero-panel strong {
    font-size: 2.1rem;
  }

  .hero-panel div {
    padding: 16px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.16);
  }

  .fuel-list article,
  .steps li {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}