/* =============================================
   FuelTank — precision engineering aesthetic
   Mobile-first, monochrome + restrained amber
   ============================================= */

/* --- Custom Properties --- */
:root {
  --color-bg:           #0A0A0B;
  --color-bg-alt:       #111214;
  --color-bg-card:      #16181B;
  --color-surface:      #16181B;
  --color-accent:       #E8A33D;
  --color-accent-hover: #F0B04E;
  --color-accent-muted: rgba(232, 163, 61, 0.08);
  --color-text:         #E8E8E6;
  --color-text-muted:   #9A9C9F;
  --color-border:       #26282C;
  --color-cta-text:     #0A0A0B;

  --font-display: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-body:    system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono:    ui-monospace, 'Cascadia Code', 'SF Mono', 'Source Code Pro', Menlo, Consolas, monospace;

  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  1.5rem;
  --space-lg:  2.5rem;
  --space-xl:  4rem;
  --space-2xl: 6rem;

  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 4px;

  --header-h:  64px;
  --transition: 0.2s ease;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
}

/* Blueprint grid — barely perceptible */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(232, 232, 230, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(232, 232, 230, 0.025) 1px, transparent 1px);
  background-size: 64px 64px;
}

body > * {
  position: relative;
  z-index: 1;
}

img,
svg {
  display: block;
  max-width: 100%;
}

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

ul,
ol {
  list-style: none;
}

/* Stroke-only icon normalization */
.icon path,
.icon rect,
.icon circle,
.trust-icon path,
.trust-icon rect,
.trust-icon circle,
.storage-icon path,
.storage-icon rect,
.storage-icon circle,
.step-marker path,
.step-marker circle,
.logo-mark path,
.logo-mark rect,
.logo-mark circle {
  stroke-width: 1.5;
}

/* --- Utilities --- */
.container {
  width: 100%;
  max-width: 1140px;
  margin-inline: auto;
  padding-inline: var(--space-md);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.icon {
  flex-shrink: 0;
}

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* --- Section index labels (mono) --- */
.section-index {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.section-index-num {
  color: var(--color-accent);
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-lg);
  max-width: 600px;
  margin-inline: auto;
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border);
  position: relative;
}

.section-header::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 48px;
  height: 1px;
  background: var(--color-accent);
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  letter-spacing: -0.03em;
  line-height: 1.12;
  margin-bottom: var(--space-sm);
}

.section-lead {
  color: var(--color-text-muted);
  font-size: 1.0625rem;
}

.section-cta {
  text-align: center;
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border);
}

/* --- Registration mark corners on cards --- */
.tech-card {
  position: relative;
}

.tech-card::before,
.tech-card::after {
  content: '';
  position: absolute;
  width: 10px;
  height: 10px;
  pointer-events: none;
  opacity: 0.45;
}

.tech-card::before {
  top: 6px;
  left: 6px;
  border-top: 1px solid var(--color-text-muted);
  border-left: 1px solid var(--color-text-muted);
}

.tech-card::after {
  bottom: 6px;
  right: 6px;
  border-bottom: 1px solid var(--color-text-muted);
  border-right: 1px solid var(--color-text-muted);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.875rem;
  line-height: 1;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--transition), color var(--transition),
              border-color var(--transition);
  white-space: nowrap;
}

.btn:active {
  transform: translateY(1px);
}

.btn-lg {
  padding: 0.9375rem 1.5rem;
  font-size: 0.9375rem;
  border-radius: var(--radius-md);
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-cta-text);
  border-color: var(--color-accent);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  border-color: var(--color-text-muted);
  color: var(--color-text);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-dark {
  background: var(--color-accent);
  color: var(--color-cta-text);
  border-color: var(--color-accent);
}

.btn-dark:hover,
.btn-dark:focus-visible {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

.btn-dark-outline {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-dark-outline:hover,
.btn-dark-outline:focus-visible {
  border-color: var(--color-text);
}

.cta-band-actions .btn-email {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.cta-band-actions .btn-email:hover,
.cta-band-actions .btn-email:focus-visible {
  border-color: var(--color-text-muted);
}

.section-cta-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
}

/* --- Header --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(10, 10, 11, 0.92);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition), border-color var(--transition);
}

.site-header.is-scrolled {
  background: rgba(10, 10, 11, 0.98);
  border-bottom-color: var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: var(--space-sm);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  flex-shrink: 0;
}

/* --- Language Switcher --- */
.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lang-switch a {
  color: var(--color-text-muted);
  padding: 0.25rem 0.125rem;
  transition: color var(--transition);
}

.lang-switch a:hover,
.lang-switch a:focus-visible {
  color: var(--color-text);
}

.lang-switch a.is-active {
  color: var(--color-accent);
}

.lang-switch-sep {
  color: var(--color-border);
  user-select: none;
}

/* --- Nav Dropdown --- */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-toggle {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition);
}

.nav-dropdown-toggle:hover,
.nav-dropdown-toggle:focus-visible,
.nav-dropdown.is-open .nav-dropdown-toggle {
  border-color: var(--color-text-muted);
  color: var(--color-text);
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  min-width: 240px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.375rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  z-index: 200;
}

.nav-dropdown.is-open .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown-menu a {
  display: block;
  padding: 0.625rem 0.75rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}

.nav-dropdown-menu a:hover,
.nav-dropdown-menu a:focus-visible,
.nav-dropdown-menu a.is-active {
  background: var(--color-accent-muted);
  color: var(--color-accent);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  color: var(--color-text);
  flex-shrink: 0;
}

.logo-mark {
  color: var(--color-accent);
}

.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.btn-header {
  font-size: 0.8125rem;
  padding: 0.5rem 0.875rem;
}

.btn-header-text strong {
  font-weight: 700;
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: var(--header-h);
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 70% 55% at 75% 45%, rgba(232, 163, 61, 0.04) 0%, transparent 65%);
}

.hero-tank-art {
  position: absolute;
  right: -5%;
  top: 50%;
  transform: translateY(-45%);
  width: min(55vw, 520px);
  height: auto;
  opacity: 1;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  padding-block: var(--space-xl);
  max-width: 640px;
}

.hero-eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--color-border);
}

.hero-eyebrow em {
  font-style: normal;
  color: var(--color-accent);
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 6vw, 3.25rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.125rem);
  color: var(--color-text-muted);
  max-width: 520px;
  margin-bottom: var(--space-lg);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

/* --- Section Shared --- */
section {
  padding-block: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

section:last-of-type {
  border-bottom: none;
}

/* --- Trust Strip --- */
.trust {
  background: var(--color-bg-alt);
}

.trust-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.trust-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-xs);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
}

.trust-icon {
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}

.trust-heading {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.02em;
}

.trust-text {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* --- What You Can Store --- */
.storage-types {
  background: var(--color-bg-alt);
}

.storage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.storage-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-sm);
  padding: var(--space-lg) var(--space-md);
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  transition: border-color var(--transition);
}

.storage-card:hover {
  border-color: #35373B;
}

.storage-icon {
  color: var(--color-text-muted);
}

.storage-heading {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.02em;
}

.storage-text {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

.storage-cta,
.storage-link {
  display: inline-block;
  margin-top: 0.25rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent);
  line-height: 1.4;
  transition: color var(--transition);
}

.storage-cta:hover,
.storage-cta:focus-visible,
.storage-link:hover,
.storage-link:focus-visible {
  color: var(--color-accent-hover);
}

/* --- Use Cases Cards --- */
.use-cases {
  background: var(--color-bg);
}

.cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

.card {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  transition: border-color var(--transition);
}

.card:hover {
  border-color: #35373B;
}

.card-link {
  display: block;
  color: inherit;
}

.card-link:hover .card-title,
.card-link:focus-visible .card-title {
  color: var(--color-accent);
}

.card-link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.card-visual {
  aspect-ratio: 5 / 3;
  overflow: hidden;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.card-placeholder {
  width: 100%;
  height: 100%;
}

.card-body {
  padding: var(--space-md);
}

.card-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.02em;
  margin-bottom: 0.375rem;
  transition: color var(--transition);
}

.card-text {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* --- Why Section --- */
.why {
  background: var(--color-bg-alt);
}

.why-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  max-width: 720px;
  margin-inline: auto;
}

.why-item {
  display: flex;
  gap: var(--space-md);
  align-items: flex-start;
  padding: var(--space-md);
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
}

.why-number {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  line-height: 1;
  flex-shrink: 0;
  min-width: 2rem;
  padding-top: 0.2rem;
}

.why-heading {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.02em;
  margin-bottom: 0.375rem;
}

.why-text {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* --- Process --- */
.process {
  background: var(--color-bg);
}

.process-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  counter-reset: step;
}

.process-step {
  text-align: left;
  padding: var(--space-lg) var(--space-md);
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  position: relative;
}

.step-marker {
  color: var(--color-text-muted);
  margin-bottom: var(--space-sm);
}

.step-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.step-text {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  max-width: 320px;
  line-height: 1.55;
}

@media (min-width: 768px) {
  .process-steps {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-sm);
    align-items: stretch;
  }

  .process-step:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 50%;
    right: -0.5rem;
    width: 1rem;
    height: 1px;
    background: var(--color-border);
    transform: translateY(-50%);
  }

  .process-step {
    text-align: center;
  }

  .step-marker {
    margin-inline: auto;
  }

  .step-text {
    margin-inline: auto;
  }
}

/* --- CTA Band --- */
.cta-band {
  background: var(--color-bg-card);
  border-top: 1px solid var(--color-accent);
  border-bottom: 1px solid var(--color-border);
  padding-block: var(--space-xl);
}

.cta-band-inner {
  text-align: center;
}

.cta-band-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 4vw, 2.125rem);
  letter-spacing: -0.03em;
  color: var(--color-text);
  line-height: 1.2;
  margin-bottom: var(--space-sm);
  max-width: 640px;
  margin-inline: auto;
}

.cta-band-text {
  color: var(--color-text-muted);
  font-size: 1rem;
  margin-bottom: var(--space-lg);
}

.cta-band-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
}

/* --- Footer --- */
.site-footer {
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-lg);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  text-align: center;
}

.footer-tagline {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  max-width: 480px;
  margin-inline: auto;
  line-height: 1.6;
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
  align-items: center;
}

.footer-list li,
.footer-list a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.footer-list a:hover,
.footer-list a:focus-visible {
  color: var(--color-text);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.footer-link-placeholder {
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.footer-link-placeholder:hover,
.footer-link-placeholder:focus-visible {
  color: var(--color-text);
}

.footer-sep {
  color: var(--color-border);
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
}

/* --- WhatsApp Float --- */
.whatsapp-float {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  z-index: 200;
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: #25d366;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.12);
  transition: transform var(--transition);
}

.whatsapp-float:hover,
.whatsapp-float:focus-visible {
  transform: translateY(-2px);
}

/* --- Focus Styles --- */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* --- Responsive: Tablet --- */
@media (min-width: 600px) {
  .trust-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .logo-text {
    font-size: 1rem;
  }

  .btn-header {
    font-size: 0.875rem;
    padding: 0.625rem 1.125rem;
  }
}

/* --- Responsive: Desktop --- */
@media (min-width: 900px) {
  :root {
    --space-xl: 5rem;
    --space-2xl: 7rem;
  }

  section {
    padding-block: var(--space-2xl);
  }

  .trust-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .trust-item {
    align-items: flex-start;
    text-align: left;
  }

  .cards-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }

  .storage-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-inner {
    display: grid;
    grid-template-columns: 1fr auto;
    grid-template-rows: auto auto;
    text-align: left;
    align-items: start;
    gap: var(--space-md) var(--space-lg);
  }

  .footer-brand {
    grid-column: 1;
    grid-row: 1;
  }

  .footer-tagline {
    margin-inline: 0;
  }

  .footer-contact {
    grid-column: 2;
    grid-row: 1;
  }

  .footer-list {
    align-items: flex-end;
  }

  .footer-legal {
    grid-column: 1;
    grid-row: 2;
    justify-content: flex-start;
  }

  .footer-copy {
    grid-column: 2;
    grid-row: 2;
    text-align: right;
  }

  .logo-text {
    font-size: 1.0625rem;
  }

  .hero-tank-art {
    right: 5%;
  }
}

@media (min-width: 1100px) {
  .cards-grid {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  }
}

/* --- Small mobile header adjustment --- */
@media (max-width: 420px) {
  .btn-header-text {
    font-size: 0.75rem;
  }

  .logo-text {
    font-size: 0.8125rem;
  }

  .hero-actions .btn-lg {
    width: 100%;
  }

  .cta-band-actions .btn-lg {
    width: 100%;
  }

  .nav-dropdown-toggle {
    font-size: 0.625rem;
    padding: 0.4375rem 0.5rem;
  }

  .btn-header-text strong {
    display: none;
  }

  html[lang="en"] .btn-header-text::after {
    content: 'Call';
  }

  .hero-tank-art {
    opacity: 0.35;
    width: 90vw;
    right: -20%;
  }

  .whatsapp-float {
    bottom: 1rem;
    right: 1rem;
    width: 48px;
    height: 48px;
  }
}

/* --- Footer Solutions --- */
.footer-solutions {
  margin-top: var(--space-md);
}

.footer-solutions-title {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.footer-solutions-list {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.footer-solutions-list a {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.footer-solutions-list a:hover,
.footer-solutions-list a:focus-visible {
  color: var(--color-text);
}

@media (min-width: 900px) {
  .footer-solutions-list {
    align-items: flex-start;
  }
}

/* --- Subpage Layout --- */
.page-hero {
  position: relative;
  min-height: 50vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-h);
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}

.page-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-hero-bg .hero-gradient {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 50% at 70% 40%, rgba(232, 163, 61, 0.035) 0%, transparent 65%);
}

.page-hero-bg .hero-tank-art {
  width: min(45vw, 400px);
  right: 0;
  opacity: 0.7;
}

.page-hero-content {
  position: relative;
  z-index: 1;
  padding-block: var(--space-lg);
  max-width: 720px;
}

.page-hero-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.75rem, 5vw, 2.625rem);
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin-bottom: var(--space-sm);
}

.page-hero-sub {
  font-size: clamp(1rem, 2.2vw, 1.125rem);
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-bottom: var(--space-md);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.breadcrumb a {
  color: var(--color-accent);
  transition: color var(--transition);
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--color-accent-hover);
}

.page-section {
  padding-block: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.page-section:nth-of-type(even) {
  background: var(--color-bg-alt);
}

.page-intro-grid {
  display: grid;
  gap: var(--space-lg);
  align-items: center;
}

.page-intro-text p {
  color: var(--color-text-muted);
  line-height: 1.75;
  margin-bottom: var(--space-sm);
}

.page-intro-text p:last-child {
  margin-bottom: 0;
}

.page-intro-visual {
  position: relative;
}

.page-intro-visual.tech-card::before,
.page-intro-visual.tech-card::after {
  z-index: 1;
}

.page-visual {
  width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-bg-card);
}

.page-adv-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.page-adv-item {
  padding: var(--space-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.page-adv-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.02em;
  margin-bottom: 0.375rem;
}

.page-adv-text {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

.page-audience-text p {
  color: var(--color-text-muted);
  line-height: 1.75;
  max-width: 720px;
  margin-inline: auto;
  text-align: center;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  max-width: 760px;
  margin-inline: auto;
  margin-top: var(--space-md);
}

.faq-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.faq-question {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.9375rem;
  letter-spacing: -0.01em;
  padding: var(--space-md);
  cursor: pointer;
  list-style: none;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-question::after {
  content: '+';
  float: right;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  font-weight: 500;
}

.faq-item[open] .faq-question::after {
  content: '−';
  color: var(--color-accent);
}

.faq-answer {
  padding: 0 var(--space-md) var(--space-md);
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-sm);
  margin-top: 0;
  margin-inline: var(--space-md);
  padding-inline: 0;
}

@media (min-width: 768px) {
  .page-intro-grid {
    grid-template-columns: 1fr 1.1fr;
  }

  .page-adv-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .page-adv-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  .header-actions {
    gap: 0.375rem;
  }

  .nav-dropdown-menu {
    right: 0;
    left: auto;
    min-width: 220px;
  }
}