/* =====================================================================
   GSC Tanks — Recreation stylesheet
   1. Design tokens
   2. Base / reset
   3. Layout helpers
   4. Typography helpers
   5. Icons
   6. Buttons
   7. Header & navigation
   8. Hero + 3D tank
   9. Trust bar
   10. Section head
   11. Products
   12. Industries
   13. Why / stats
   14. Projects
   15. Certifications
   16. Tank selector
   17. Testimonials
   18. Resources
   19. FAQ
   20. Contact
   21. Footer
   22. Animations
   23. Responsive
   ===================================================================== */

/* ---------- 1. Design tokens ---------- */
:root {
  --radius: .5rem;

  --background: oklch(98.5% .005 250);
  --foreground: oklch(18% .03 260);
  --primary: oklch(22% .05 255);
  --primary-foreground: oklch(98.5% .005 250);
  --steel: oklch(32% .05 255);
  --secondary: oklch(95% .01 250);
  --muted-foreground: oklch(45% .02 255);
  --accent: oklch(72% .18 50);
  --accent-foreground: oklch(18% .03 260);
  --success: oklch(72% .17 150);
  --border: oklch(90% .01 250);
  --input: oklch(92% .01 250);
  --ring: oklch(72% .18 50);

  /* slate helpers for the 3D tank */
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-700: #334155;

  /* shadows */
  --shadow-sm: 0 1px 3px 0 #0000001a, 0 1px 2px -1px #0000001a;
  --shadow-lg: 0 10px 15px -3px #0000001a, 0 4px 6px -4px #0000001a;
  --shadow-xl: 0 20px 25px -5px #0000001a, 0 8px 10px -6px #0000001a;
  --shadow-2xl: 0 25px 50px -12px #00000040;
  --shadow-card: 0 10px 30px -15px color-mix(in oklab, var(--primary) 25%, transparent);
  --shadow-elevated: 0 30px 80px -30px color-mix(in oklab, var(--primary) 35%, transparent);
  --sh-accent-20: color-mix(in oklab, var(--accent) 20%, transparent);
  --sh-accent-40: color-mix(in oklab, var(--accent) 40%, transparent);

  --font-body: "Inter", ui-sans-serif, system-ui, sans-serif;
  --font-display: "Manrope", "Inter", ui-sans-serif, system-ui, sans-serif;

  --container: 1280px;
}

/* ---------- 2. Base / reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  font-family: var(--font-body);
  background: var(--background);
  color: var(--foreground);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul { list-style: none; }
input, select, textarea { font: inherit; }

h1, h2, h3, h4, h5, h6 { font-family: var(--font-display); letter-spacing: -.02em; }

/* ---------- 3. Layout helpers ---------- */
.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 1.25rem;
  width: 100%;
}

.section { background: var(--background); }
.section > .container { padding-block: 5rem; }
.section-dark { background: var(--primary); color: #fff; }

/* ---------- 4. Typography helpers ---------- */
.text-accent { color: var(--accent); }

.eyebrow {
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
}

/* ---------- 5. Icons ---------- */
.icon { width: 1rem; height: 1rem; flex-shrink: 0; }
.icon-xs { width: .75rem; height: .75rem; flex-shrink: 0; }
.icon-sm { width: 1rem; height: 1rem; flex-shrink: 0; }
.icon-md { width: 1.5rem; height: 1.5rem; flex-shrink: 0; }
.icon-lg { width: 1.75rem; height: 1.75rem; flex-shrink: 0; }
.icon-accent { color: var(--accent); }
.icon-success { color: var(--success); }

/* ---------- 6. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  font-weight: 600;
  border-radius: calc(var(--radius) - 2px);
  transition: background-color .2s, color .2s, box-shadow .2s, transform .2s;
  white-space: nowrap;
  cursor: pointer;
  padding: .875rem 1.5rem;
  font-size: .875rem;
}
.btn-accent { background: var(--accent); color: var(--primary); }
.btn-accent:hover { background: color-mix(in oklab, var(--accent) 90%, transparent); }

.btn-ghost {
  border: 1px solid rgba(255,255,255,.3);
  background: rgba(255,255,255,.05);
  backdrop-filter: blur(8px);
  color: #fff;
}
.btn-ghost:hover { background: rgba(255,255,255,.1); }

.btn-outline-light {
  border: 1px solid rgba(255,255,255,.2);
  color: #fff;
}
.btn-outline-light:hover { background: rgba(255,255,255,.1); }

.btn-sm { padding: .625rem 1.25rem; font-size: .875rem; }
.btn-lg { padding: 1rem 1.75rem; font-size: 1rem; }

.btn-arrow .arrow { transition: transform .3s; }
.btn-arrow.group:hover .arrow { transform: translateX(4px); }

/* ---------- 7. Header & navigation ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  background: #fff;
  border-bottom: 1px solid transparent;
  transition: border-color .3s, box-shadow .3s;
}
.site-header.scrolled {
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-sm);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
  padding-block: .75rem;
}
.brand { display: inline-flex; align-items: center; gap: .5rem; }
.brand-logo { height: 2.5rem; width: auto; }

.main-nav { display: none; align-items: center; gap: 1.75rem; }
.main-nav a {
  font-size: .875rem;
  font-weight: 500;
  color: color-mix(in oklab, var(--primary) 80%, transparent);
  transition: color .2s;
}
.main-nav a:hover { color: var(--accent); }

.header-actions { display: none; align-items: center; gap: .75rem; }
.phone-link {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .875rem;
  font-weight: 500;
  color: color-mix(in oklab, var(--primary) 80%, transparent);
  transition: color .2s;
}
.phone-link:hover { color: var(--primary); }
.header-actions .btn-accent { box-shadow: 0 10px 15px -3px var(--sh-accent-20), 0 4px 6px -4px var(--sh-accent-20); }

.menu-toggle { display: inline-flex; padding: .5rem; color: var(--primary); }
.menu-toggle .icon-menu, .menu-toggle .icon-close { width: 1.5rem; height: 1.5rem; }
.menu-toggle .icon-close { display: none; }
.menu-toggle[aria-expanded="true"] .icon-menu { display: none; }
.menu-toggle[aria-expanded="true"] .icon-close { display: block; }

.mobile-nav { background: #fff; border-top: 1px solid var(--border); }
.mobile-nav[hidden] { display: none; }
.mobile-nav-inner { display: flex; flex-direction: column; gap: .75rem; padding-block: 1rem; }
.mobile-nav-inner a { color: var(--primary); padding-block: .5rem; font-size: 1rem; }
.mobile-quote { margin-top: .5rem; padding: .75rem 1.25rem; }

/* ---------- 8. Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  padding-top: 7rem;
  padding-bottom: 5rem;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-overlay-1 {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg,
    color-mix(in oklab, var(--primary) 95%, transparent),
    color-mix(in oklab, var(--primary) 85%, transparent) 50%,
    color-mix(in oklab, var(--primary) 70%, transparent));
}
.hero-overlay-2 {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at bottom right, rgba(245,130,32,.18), transparent 50%);
}
.hero-grid {
  position: relative;
  display: grid;
  gap: 3rem;
  align-items: center;
  min-height: calc(100vh - 7rem);
}
.hero-content { color: #fff; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .375rem .75rem;
  border-radius: 9999px;
  background: rgba(255,255,255,.1);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,.2);
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.hero-title {
  margin-top: 1.5rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 2.25rem;
  line-height: 1.05;
}
.hero-lead {
  margin-top: 1.5rem;
  font-size: 1.125rem;
  color: rgba(255,255,255,.8);
  max-width: 42rem;
  line-height: 1.625;
}
.hero-buttons {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}
.hero-buttons .btn-accent {
  box-shadow: 0 20px 25px -5px var(--sh-accent-20), 0 8px 10px -6px var(--sh-accent-20);
}
.hero-buttons .btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 25px -5px var(--sh-accent-40), 0 8px 10px -6px var(--sh-accent-40);
}
.hero-trust {
  margin-top: 2.5rem;
  display: flex;
  flex-wrap: wrap;
  column-gap: 1.5rem;
  row-gap: .75rem;
}
.trust-item {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .875rem;
  color: rgba(255,255,255,.8);
}
.hero-fade {
  position: absolute;
  inset: auto 0 0 0;
  height: 6rem;
  background: linear-gradient(to top, var(--background), transparent);
}

/* 3D tank */
.tank-stage {
  position: relative;
  width: 100%;
  aspect-ratio: 1/1;
  max-width: 28rem;
  margin-inline: auto;
  perspective: 1200px;
}
.tank-glow {
  position: absolute;
  inset: 2rem;
  border-radius: 9999px;
  background: color-mix(in oklab, var(--accent) 20%, transparent);
  filter: blur(64px);
}
.tank-rotate {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform-style: preserve-3d;
  animation: tank-spin 18s linear infinite;
}
.tank-body-wrap {
  position: relative;
  width: 14rem;
  height: 18rem;
  transform-style: preserve-3d;
}
.tank-body {
  position: absolute;
  inset: 0;
  border-radius: 40%/8%;
  background: linear-gradient(to bottom, #fff, var(--slate-200) 50%, var(--slate-400));
  border: 1px solid rgba(255,255,255,.3);
  box-shadow: var(--shadow-2xl);
}
.tank-top {
  position: absolute;
  top: -.75rem;
  left: 0; right: 0;
  height: 2rem;
  border-radius: 50%;
  background: linear-gradient(to bottom, var(--slate-100), var(--slate-300));
  border: 1px solid rgba(255,255,255,.4);
}
.tank-bottom-shadow {
  position: absolute;
  bottom: -.5rem;
  left: 0; right: 0;
  height: 1.5rem;
  border-radius: 50%;
  background: color-mix(in oklab, var(--slate-700) 40%, transparent);
  filter: blur(12px);
}
.tank-ladder {
  position: absolute;
  right: 1rem;
  top: 1.5rem;
  bottom: 1.5rem;
  width: .5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.tank-ladder span {
  height: 2px;
  width: 100%;
  border-radius: 9999px;
  background: color-mix(in oklab, var(--primary) 70%, transparent);
}
.tank-band {
  position: absolute;
  left: 0; right: 0;
  top: 50%;
  transform: translateY(-50%);
  height: 2.5rem;
  background: color-mix(in oklab, var(--primary) 90%, transparent);
  display: flex;
  align-items: center;
  justify-content: center;
}
.tank-band span {
  font-family: var(--font-display);
  font-weight: 800;
  color: #fff;
  font-size: .875rem;
  letter-spacing: .1em;
}
.tank-highlight {
  position: absolute;
  top: 1rem; bottom: 1rem;
  left: 1.5rem;
  width: .75rem;
  border-radius: 9999px;
  background: rgba(255,255,255,.6);
  filter: blur(4px);
}
.tank-card {
  position: absolute;
  display: none;
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(8px);
  border-radius: var(--radius);
  padding: .5rem .75rem;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--border);
  font-size: .75rem;
}
.tank-card-tl { top: 1.5rem; left: -.5rem; }
.tank-card-br { bottom: 2.5rem; right: -.5rem; }
.tank-card-label { color: var(--muted-foreground); }
.tank-card-value { font-family: var(--font-display); font-weight: 800; color: var(--primary); }

/* ---------- 9. Trust bar ---------- */
.trust-bar { background: #fff; border-block: 1px solid var(--border); }
.trust-bar-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  padding-block: 1.5rem;
}
.trust-bar-item {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .875rem;
  color: var(--primary);
}
.trust-bar-item span { font-weight: 500; }

/* ---------- 10. Section head ---------- */
.section-head { max-width: 48rem; margin-bottom: 3rem; }
.section-title {
  margin-top: .75rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.875rem;
  line-height: 1.25;
  color: var(--primary);
}
.section-dark .section-title { color: #fff; }
.section-lead {
  margin-top: 1rem;
  font-size: 1rem;
  line-height: 1.625;
  color: var(--muted-foreground);
}
.section-dark .section-lead { color: rgba(255,255,255,.7); }

/* ---------- 11. Products ---------- */
.product-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
.product-card {
  display: block;
  background: #fff;
  border-radius: calc(var(--radius) + 8px);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  transition: border-color .3s, box-shadow .3s, transform .3s;
}
.product-card:hover {
  border-color: color-mix(in oklab, var(--accent) 40%, transparent);
  box-shadow: var(--shadow-elevated);
  transform: translateY(-4px);
}
.product-media { aspect-ratio: 4/3; background: var(--secondary); overflow: hidden; }
.product-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.product-card:hover .product-media img { transform: scale(1.05); }
.product-body { padding: 1.5rem; }
.product-title { font-family: var(--font-display); font-weight: 800; font-size: 1.25rem; color: var(--primary); }
.product-text { margin-top: .5rem; font-size: .875rem; color: var(--muted-foreground); line-height: 1.625; }
.learn-more {
  margin-top: 1rem;
  display: inline-flex;
  align-items: center;
  gap: .375rem;
  font-size: .875rem;
  font-weight: 600;
  color: var(--accent);
  transition: gap .3s;
}
.product-card:hover .learn-more { gap: .625rem; }

/* ---------- 12. Industries ---------- */
.industry-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.industry-card {
  position: relative;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: calc(var(--radius) + 4px);
  padding: 1.25rem;
  overflow: hidden;
  transition: background-color .3s, border-color .3s;
}
.industry-card:hover {
  background: rgba(255,255,255,.1);
  border-color: color-mix(in oklab, var(--accent) 40%, transparent);
}
.industry-title {
  margin-top: 1rem;
  font-family: var(--font-display);
  font-weight: 800;
  color: #fff;
  font-size: 1rem;
  line-height: 1.375;
}
.industry-meta { margin-top: .75rem; font-size: .75rem; color: rgba(255,255,255,.6); display: flex; flex-direction: column; gap: .25rem; }
.industry-meta span { color: rgba(255,255,255,.4); }
.industry-link {
  margin-top: 1rem;
  display: inline-flex;
  align-items: center;
  gap: .25rem;
  font-size: .75rem;
  font-weight: 600;
  color: var(--accent);
  opacity: 0;
  transition: opacity .3s;
}
.industry-card:hover .industry-link { opacity: 1; }

/* ---------- 13. Why / stats ---------- */
.why-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
.why-card {
  background: #fff;
  border-radius: calc(var(--radius) + 4px);
  padding: 1.75rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  transition: box-shadow .3s, border-color .3s;
}
.why-card:hover {
  box-shadow: var(--shadow-elevated);
  border-color: color-mix(in oklab, var(--accent) 30%, transparent);
}
.why-icon {
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius);
  background: var(--primary);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
}
.why-title { margin-top: 1.25rem; font-family: var(--font-display); font-weight: 800; font-size: 1.25rem; color: var(--primary); }
.why-text { margin-top: .5rem; font-size: .875rem; color: var(--muted-foreground); line-height: 1.625; }

.stats-grid {
  margin-top: 3.5rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.stat-card {
  min-width: 0;
  border-radius: calc(var(--radius) + 8px);
  background: linear-gradient(135deg, var(--primary), var(--steel));
  padding: 2rem;
  text-align: center;
  color: #fff;
  box-shadow: var(--shadow-elevated);
}
.stat-value span { display: inline-block; max-width: 100%; overflow: hidden; }
.stat-value { font-family: var(--font-display); font-weight: 800; font-size: 2.25rem; color: var(--accent); }
.stat-label { margin-top: .5rem; font-size: .875rem; color: rgba(255,255,255,.7); text-transform: uppercase; letter-spacing: .1em; }

/* ---------- 14. Projects ---------- */
.filter-tabs { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 2rem; }
.filter-tab {
  padding: .5rem 1rem;
  border-radius: 9999px;
  font-size: .875rem;
  font-weight: 600;
  border: 1px solid var(--border);
  color: var(--primary);
  transition: color .2s, border-color .2s, background-color .2s;
}
.filter-tab:hover { border-color: var(--accent); color: var(--accent); }
.filter-tab.is-active { background: var(--primary); color: #fff; border-color: var(--primary); }
.filter-tab.is-active:hover { color: #fff; }

.project-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
.project-card {
  background: #fff;
  border-radius: calc(var(--radius) + 8px);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
  transition: box-shadow .3s, transform .3s;
}
.project-card:hover { box-shadow: var(--shadow-elevated); transform: translateY(-4px); }
.project-media { position: relative; aspect-ratio: 4/3; overflow: hidden; }
.project-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.project-card:hover .project-media img { transform: scale(1.05); }
.project-tag {
  position: absolute;
  top: .75rem; left: .75rem;
  background: var(--accent);
  color: var(--primary);
  font-size: .75rem;
  font-weight: 700;
  padding: .25rem .625rem;
  border-radius: calc(var(--radius) - 4px);
}
.project-body { padding: 1.5rem; display: flex; flex-direction: column; gap: .75rem; }
.project-heading { display: flex; align-items: baseline; justify-content: space-between; gap: .5rem; }
.project-title { font-family: var(--font-display); font-weight: 800; font-size: 1.125rem; color: var(--primary); }
.project-spec { font-size: .75rem; font-weight: 600; color: var(--accent); white-space: nowrap; }
.project-label { font-size: .75rem; text-transform: uppercase; letter-spacing: .1em; color: var(--muted-foreground); }
.project-text { font-size: .875rem; color: var(--foreground); margin-top: .25rem; }
.project-card.is-hidden { display: none; }

/* ---------- 15. Certifications ---------- */
.certs { position: relative; overflow: hidden; }
.certs-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 20%, rgba(245,130,32,.15), transparent 50%);
}
.certs-inner { position: relative; padding-block: 6rem; }
.certs .section-head { margin-bottom: 0; }
.certs-title { margin-top: .75rem; font-family: var(--font-display); font-weight: 800; font-size: 2.25rem; }
.certs-lead { margin-top: 1rem; color: rgba(255,255,255,.7); max-width: 36rem; }
.cert-grid {
  margin-top: 3rem;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
.cert-card {
  aspect-ratio: 1/1;
  border-radius: calc(var(--radius) + 4px);
  border: 1px solid rgba(255,255,255,.15);
  background: rgba(255,255,255,.05);
  backdrop-filter: blur(8px);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  transition: border-color .3s, background-color .3s;
}
.cert-card:hover {
  border-color: color-mix(in oklab, var(--accent) 50%, transparent);
  background: rgba(255,255,255,.1);
}
.cert-name { font-family: var(--font-display); font-weight: 800; font-size: 1.5rem; color: var(--accent); }
.cert-desc { margin-top: .5rem; font-size: 11px; color: rgba(255,255,255,.6); line-height: 1.25; }
.certs-cta { margin-top: 2.5rem; }
.link-accent {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .875rem;
  font-weight: 600;
  color: var(--accent);
  transition: gap .3s;
}
.link-accent:hover { gap: .75rem; }

/* ---------- 16. Tank selector ---------- */
.selector-card {
  background: linear-gradient(135deg, #fff, var(--secondary));
  border-radius: calc(var(--radius) + 16px);
  padding: 2rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-elevated);
}
.selector-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
.field label { font-size: .875rem; font-weight: 600; color: var(--primary); display: block; }
.field select, .field input, .field textarea {
  margin-top: .375rem;
  width: 100%;
  border-radius: calc(var(--radius) - 2px);
  border: 1px solid var(--input);
  background: #fff;
  padding: .75rem;
  font-size: .875rem;
  color: var(--foreground);
}
.field textarea { resize: vertical; }
.field select:focus, .field input:focus, .field textarea:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--ring);
}
.selector-footer {
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
}
.selector-reco { font-size: .875rem; color: var(--muted-foreground); text-align: center; }
.selector-reco span { font-weight: 600; color: var(--primary); }
.selector-footer .btn-accent {
  padding: .875rem 1.5rem;
  box-shadow: 0 10px 15px -3px var(--sh-accent-20), 0 4px 6px -4px var(--sh-accent-20);
}

/* ---------- 17. Testimonials ---------- */
.testimonial-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
.testimonial-card {
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: calc(var(--radius) + 8px);
  padding: 1.75rem;
  transition: border-color .2s;
}
.testimonial-card:hover { border-color: color-mix(in oklab, var(--accent) 30%, transparent); }
.stars { display: flex; gap: .125rem; color: var(--accent); }
.stars .star { fill: var(--accent); }
.testimonial-card blockquote { margin-top: 1rem; color: rgba(255,255,255,.9); line-height: 1.625; }
.testimonial-author { margin-top: 1.25rem; display: flex; align-items: center; gap: .75rem; }
.avatar {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 9999px;
  background: linear-gradient(135deg, var(--accent), color-mix(in oklab, var(--accent) 60%, transparent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  font-family: var(--font-display);
  font-weight: 800;
  flex-shrink: 0;
}
.author-name { font-weight: 600; color: #fff; font-size: .875rem; }
.author-role { font-size: .75rem; color: rgba(255,255,255,.6); }

/* ---------- 18. Resources ---------- */
.resource-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
.resource-card {
  display: block;
  background: #fff;
  border-radius: calc(var(--radius) + 4px);
  border: 1px solid var(--border);
  padding: 1.5rem;
  transition: border-color .3s, box-shadow .3s;
}
.resource-card:hover { border-color: color-mix(in oklab, var(--accent) 40%, transparent); box-shadow: var(--shadow-card); }
.resource-meta { display: flex; align-items: center; gap: .5rem; font-size: .75rem; }
.resource-badge {
  padding: .125rem .5rem;
  border-radius: calc(var(--radius) - 4px);
  background: color-mix(in oklab, var(--accent) 15%, transparent);
  color: var(--accent);
  font-weight: 700;
  letter-spacing: .025em;
  text-transform: uppercase;
}
.resource-time { color: var(--muted-foreground); }
.resource-title {
  margin-top: 1rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--primary);
  transition: color .2s;
}
.resource-card:hover .resource-title { color: var(--accent); }
.resource-link {
  margin-top: 1rem;
  display: inline-flex;
  align-items: center;
  gap: .25rem;
  font-size: .875rem;
  font-weight: 600;
  color: var(--primary);
  transition: gap .3s;
}
.resource-card:hover .resource-link { gap: .5rem; }

/* ---------- 19. FAQ ---------- */
.faq-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: start;
}
.faq-aside {
  background: linear-gradient(135deg, var(--primary), var(--steel));
  color: #fff;
  border-radius: calc(var(--radius) + 8px);
  padding: 2rem;
  box-shadow: var(--shadow-elevated);
}
.faq-aside-icon {
  width: 3rem;
  height: 3rem;
  border-radius: var(--radius);
  background: color-mix(in oklab, var(--accent) 15%, transparent);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
}
.faq-aside-title { margin-top: 1.25rem; font-family: var(--font-display); font-weight: 800; font-size: 1.5rem; line-height: 1.25; }
.faq-aside-text { margin-top: .75rem; font-size: .875rem; color: rgba(255,255,255,.7); line-height: 1.625; }
.faq-aside-actions { margin-top: 1.5rem; display: flex; flex-direction: column; gap: .75rem; }
.faq-aside-actions .btn { padding: .75rem 1.25rem; }

.faq-list {
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 8px);
  background: #fff;
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
.faq-item + .faq-item { border-top: 1px solid var(--border); }
.faq-question {
  width: 100%;
  text-align: left;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem;
  transition: background-color .2s;
}
.faq-question:hover { background: color-mix(in oklab, var(--secondary) 60%, transparent); }
.faq-question span:first-child { font-family: var(--font-display); font-weight: 800; font-size: 1rem; color: var(--primary); }
.faq-toggle {
  flex-shrink: 0;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 9999px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--secondary);
  color: var(--primary);
  transition: background-color .2s, color .2s;
}
.faq-item.is-open .faq-toggle { background: var(--accent); color: var(--primary); }
.faq-icon-minus { display: none; }
.faq-item.is-open .faq-icon-minus { display: block; }
.faq-item.is-open .faq-icon-plus { display: none; }
.faq-answer {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows .3s ease-out, opacity .3s ease-out;
}
.faq-item.is-open .faq-answer { grid-template-rows: 1fr; opacity: 1; }
.faq-answer-inner { overflow: hidden; }
.faq-answer-inner p { padding: 0 1.5rem 1.5rem; font-size: .875rem; color: var(--muted-foreground); line-height: 1.625; }

/* ---------- 20. Contact ---------- */
.contact {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--primary), var(--steel) 50%, var(--primary));
  color: #fff;
}
.contact-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top right, rgba(245,130,32,.2), transparent 60%);
}
.contact-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
  padding-block: 6rem;
}
.contact-title { margin-top: .75rem; font-family: var(--font-display); font-weight: 800; font-size: 2.25rem; line-height: 1.25; }
.contact-lead { margin-top: 1.25rem; font-size: 1.125rem; color: rgba(255,255,255,.8); max-width: 36rem; }
.contact-actions { margin-top: 2rem; display: flex; flex-wrap: wrap; gap: .75rem; }
.contact-actions .btn { padding: .875rem 1.5rem; }
.contact-badges {
  margin-top: 2.5rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  max-width: 28rem;
}
.contact-badge {
  font-size: .75rem;
  color: rgba(255,255,255,.6);
  border-top: 1px solid rgba(255,255,255,.15);
  padding-top: .75rem;
}
.contact-badge svg { margin-bottom: .375rem; }

.contact-form {
  background: #fff;
  border-radius: calc(var(--radius) + 8px);
  padding: 1.5rem;
  box-shadow: var(--shadow-elevated);
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.form-title { font-family: var(--font-display); font-weight: 800; font-size: 1.5rem; color: var(--primary); }
.form-sub { font-size: .875rem; color: var(--muted-foreground); margin-top: -.5rem; }
.form-row { display: grid; grid-template-columns: 1fr; gap: 1rem; }
.contact-form .field input, .contact-form .field select, .contact-form .field textarea { padding: .625rem .75rem; }
.form-submit { width: 100%; padding: .875rem; box-shadow: 0 10px 15px -3px var(--sh-accent-20), 0 4px 6px -4px var(--sh-accent-20); }
.form-note { font-size: .75rem; color: var(--muted-foreground); text-align: center; }

/* ---------- 21. Footer ---------- */
.site-footer { background: var(--primary); color: rgba(255,255,255,.8); }
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  padding-block: 4rem;
}
.footer-logo {
  display: inline-block;
  background: #fff;
  border-radius: calc(var(--radius) - 2px);
  padding: .5rem;
  margin-bottom: 1rem;
}
.footer-logo img { height: 2.5rem; width: auto; }
.footer-about { font-size: .875rem; line-height: 1.625; }
.footer-contact { margin-top: 1.25rem; display: flex; flex-direction: column; gap: .5rem; font-size: .875rem; }
.footer-contact-row { display: flex; align-items: center; gap: .5rem; }
.footer-contact-row .mt { margin-top: .125rem; align-self: flex-start; }
.footer-heading { font-family: var(--font-display); font-weight: 800; color: #fff; margin-bottom: 1rem; }
.footer-links { display: flex; flex-direction: column; gap: .5rem; font-size: .875rem; }
.footer-links a { transition: color .2s; }
.footer-links a:hover { color: var(--accent); }
.footer-news-text { font-size: .875rem; margin-bottom: .75rem; }
.footer-news-form { display: flex; gap: .5rem; }
.footer-news-form input {
  flex: 1;
  border-radius: calc(var(--radius) - 2px);
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.2);
  padding: .625rem .75rem;
  font-size: .875rem;
  color: #fff;
}
.footer-news-form input::placeholder { color: rgba(255,255,255,.5); }
.footer-news-form input:focus { outline: none; box-shadow: 0 0 0 2px var(--accent); }
.footer-news-form button {
  background: var(--accent);
  color: var(--primary);
  padding-inline: 1rem;
  border-radius: calc(var(--radius) - 2px);
  font-weight: 600;
  font-size: .875rem;
}
.footer-tags { margin-top: 1.5rem; display: flex; gap: .5rem; flex-wrap: wrap; }
.footer-tags span {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .1em;
  padding: .25rem .5rem;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: calc(var(--radius) - 4px);
}
.footer-bottom { border-top: 1px solid rgba(255,255,255,.1); }
.footer-bottom-inner {
  padding-block: 1.5rem;
  font-size: .75rem;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  justify-content: space-between;
}

/* ---------- 22. Animations ---------- */
@keyframes tank-spin { 0% { transform: rotateY(0); } 100% { transform: rotateY(360deg); } }
@keyframes fade-up { 0% { opacity: 0; transform: translateY(20px); } 100% { opacity: 1; transform: translateY(0); } }
.reveal { animation: fade-up .8s ease-out both; }

@media (prefers-reduced-motion: reduce) {
  .tank-rotate { animation: none; }
  .reveal { animation: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 23. Responsive ---------- */
/* sm ≥ 640px */
@media (min-width: 640px) {
  .hero-title { font-size: 3rem; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .industry-grid { grid-template-columns: repeat(2, 1fr); }
  .form-row { grid-template-columns: repeat(2, 1fr); }
  .selector-grid { grid-template-columns: repeat(2, 1fr); }
  .selector-footer { flex-direction: row; }
  .selector-reco { text-align: left; }
}

/* md ≥ 768px */
@media (min-width: 768px) {
  .tank-card { display: block; }
  .trust-bar-grid { grid-template-columns: repeat(3, 1fr); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .project-grid { grid-template-columns: repeat(3, 1fr); }
  .cert-grid { grid-template-columns: repeat(3, 1fr); }
  .testimonial-grid { grid-template-columns: repeat(3, 1fr); }
  .resource-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-bottom-inner { flex-direction: row; }
}

/* lg ≥ 1024px */
@media (min-width: 1024px) {
  .main-nav { display: flex; }
  .header-actions { display: flex; }
  .menu-toggle { display: none; }
  .mobile-nav { display: none !important; }

  .section > .container { padding-block: 7rem; }

  .hero-title { font-size: 3.75rem; }
  .hero-lead { font-size: 1.25rem; }
  .hero-grid { grid-template-columns: 1.2fr 1fr; }

  .section-title { font-size: 3rem; }
  .section-lead { font-size: 1.125rem; }

  .product-grid { grid-template-columns: repeat(3, 1fr); }
  .industry-grid { grid-template-columns: repeat(3, 1fr); }
  .why-grid { grid-template-columns: repeat(3, 1fr); }
  .stats-grid { grid-template-columns: repeat(4, 1fr); }
  .cert-grid { grid-template-columns: repeat(6, 1fr); }
  .resource-grid { grid-template-columns: repeat(3, 1fr); }
  .trust-bar-grid { grid-template-columns: repeat(6, 1fr); }
  .footer-grid { grid-template-columns: repeat(4, 1fr); }

  .certs-title, .contact-title { font-size: 3rem; }
  .stat-value { font-size: 3rem; }

  .faq-grid { grid-template-columns: 1fr 2fr; }
  .faq-question span:first-child { font-size: 1.125rem; }
  .faq-answer-inner p { font-size: 1rem; }

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

  .selector-card { padding: 3rem; }
}

/* xl ≥ 1280px */
@media (min-width: 1280px) {
  .hero-title { font-size: 4.5rem; }
  .industry-grid { grid-template-columns: repeat(5, 1fr); }
}