/* NAH Site — Version 5
   Based on V4 but with BHW-style technical illustrations and refined corporate look. */

.v5-only { display: none !important; }

[data-version="v5"] body {
  background: var(--hero-tint);
}

[data-version="v5"] .legacy-main,
[data-version="v5"] .v4-main,
[data-version="v5"] .footer--v1,
[data-version="v5"] .footer--v2,
[data-version="v5"] .v4-footer,
[data-version="v5"] .scroll-progress {
  display: none !important;
}

[data-version="v5"] .v5-only { display: block !important; }
[data-version="v5"] .v5-brand { display: inline-flex !important; }

[data-version="v5"] .header {
  background: color-mix(in srgb, var(--hero-tint) 86%, transparent);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(45, 45, 45, 0.08);
}

[data-version="v5"] .header.is-scrolled {
  background: color-mix(in srgb, var(--hero-tint) 94%, transparent);
  box-shadow: none;
}

[data-version="v5"] .nav__list a {
  color: var(--color-text-muted);
}

[data-version="v5"] .header .logo__variant {
  display: none;
}

[data-version="v5"] .header .logo__word {
  color: var(--color-charcoal);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 800;
}

.version-panel__badge--v5 {
  background: var(--color-primary);
}

[data-version="v5"] .version-panel__btn[data-version="v5"].is-active {
  background: var(--color-primary-muted);
  box-shadow: inset 0 0 0 1.5px var(--color-primary);
}

.v5-main {
  color: var(--color-charcoal);
  background: var(--color-white);
}

/* --- V5 Hero --- */
.v5-hero {
  position: relative;
  min-height: 100vh;
  padding: calc(var(--header-h) + 4rem) 0 5rem;
  overflow: hidden;
  background: radial-gradient(circle at 80% 20%, var(--glow-primary), transparent 40rem);
}

.v5-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 5rem;
  align-items: center;
}

.v5-brand {
  align-items: center;
  gap: 0.85rem;
  color: var(--color-charcoal);
}

.v5-brand__mark {
  position: relative;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* BHW-inspired interlocking logo for V5 */
.v5-brand__mark svg {
  width: 100%;
  height: 100%;
}

.v5-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.v5-brand__text strong {
  font-size: 1.25rem;
  letter-spacing: 0.05em;
  color: var(--color-charcoal);
}

.v5-brand__text small {
  margin-top: 0.35rem;
  font-size: 0.65rem;
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.v5-kicker,
.v5-label {
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 1.5rem;
}

.v5-hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(3.5rem, 8vw, 7rem);
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: var(--color-charcoal);
  margin-bottom: 2rem;
}

.v5-lead {
  max-width: 38rem;
  font-size: clamp(1.1rem, 1.5vw, 1.4rem);
  line-height: 1.6;
  color: var(--color-text-muted);
  margin-bottom: 3rem;
}

.v5-hero__actions {
  display: flex;
  gap: 1rem;
}

.v5-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2rem;
  border-radius: 0.5rem;
  font-weight: 700;
  font-size: 0.95rem;
  transition: all 0.3s var(--ease-out);
}

.v5-btn--primary {
  background: var(--color-primary);
  color: var(--color-white);
}

.v5-btn--primary:hover {
  background: var(--color-charcoal);
  transform: translateY(-2px);
}

.v5-btn--outline {
  border: 1px solid var(--color-warm-gray-200);
  color: var(--color-charcoal);
}

.v5-btn--outline:hover {
  background: var(--color-off-white);
  border-color: var(--color-charcoal);
}

/* BHW Illustration: Technical Grid / Blueprint */
.v5-hero__visual {
  position: relative;
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.v5-illus-bhw {
  position: relative;
  width: 100%;
  height: 100%;
  background: 
    radial-gradient(circle at 50% 50%, var(--color-primary-muted) 0%, transparent 70%),
    linear-gradient(rgba(45, 45, 45, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(45, 45, 45, 0.03) 1px, transparent 1px);
  background-size: 100% 100%, 40px 40px, 40px 40px;
  border: 1px solid var(--color-warm-gray-100);
  border-radius: 2rem;
  overflow: hidden;
}

.v5-illus-bhw__shape {
  position: absolute;
  border: 1.5px solid var(--color-primary);
  opacity: 0.6;
}

.v5-illus-bhw__shape--1 {
  width: 60%;
  height: 60%;
  top: 10%;
  left: 10%;
  border-radius: 1rem;
  background: linear-gradient(135deg, var(--color-primary-muted), transparent);
}

.v5-illus-bhw__shape--2 {
  width: 40%;
  height: 40%;
  bottom: 15%;
  right: 15%;
  border-radius: 50%;
  border-color: var(--color-accent);
  background: radial-gradient(circle at 30% 30%, var(--color-accent-muted), transparent);
}

.v5-illus-bhw__line {
  position: absolute;
  background: var(--color-warm-gray-200);
}

.v5-illus-bhw__line--h { width: 100%; height: 1px; top: 50%; }
.v5-illus-bhw__line--v { width: 1px; height: 100%; left: 50%; }

/* --- V5 Proof --- */
.v5-proof {
  padding: 4rem 0;
  border-top: 1px solid var(--color-warm-gray-100);
  border-bottom: 1px solid var(--color-warm-gray-100);
}

.v5-proof__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 3rem;
}

.v5-proof__item strong {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-charcoal);
  line-height: 1;
  margin-bottom: 0.5rem;
}

.v5-proof__item span {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* --- V5 Sections --- */
.v5-section {
  padding: 8rem 0;
}

.v5-section--alt {
  background: var(--color-off-white);
}

.v5-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: center;
}

.v5-section h2 {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  line-height: 1;
  color: var(--color-charcoal);
  margin-bottom: 2rem;
}

.v5-text {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--color-text-muted);
}

.v5-text p + p { margin-top: 1.5rem; }

/* BHW Illustration: Science / Molecule */
.v5-illus-science {
  position: relative;
  width: 100%;
  aspect-ratio: 1.2;
  background: var(--color-white);
  border: 1px solid var(--color-warm-gray-100);
  border-radius: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.v5-molecule {
  position: relative;
  width: 200px;
  height: 200px;
}

.v5-molecule__node {
  position: absolute;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-white);
  border: 2px solid var(--color-primary);
  z-index: 2;
}

.v5-molecule__node--1 { top: 0; left: 50%; transform: translateX(-50%); }
.v5-molecule__node--2 { bottom: 0; left: 0; border-color: var(--color-accent); }
.v5-molecule__node--3 { bottom: 0; right: 0; }

.v5-molecule__link {
  position: absolute;
  background: var(--color-warm-gray-200);
  z-index: 1;
}

.v5-molecule__link--1 { width: 2px; height: 100%; left: 50%; top: 0; transform: translateX(-50%); }
.v5-molecule__link--2 { height: 2px; width: 100%; bottom: 20px; left: 0; }

/* --- V5 Portfolio --- */
.v5-portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 4rem;
}

.v5-card {
  padding: 2.5rem;
  background: var(--color-white);
  border: 1px solid var(--color-warm-gray-100);
  transition: all 0.4s var(--ease-out);
}

.v5-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.v5-card__tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--color-primary);
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.v5-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.v5-card p {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* --- V5 Footer --- */
.v5-footer {
  padding: 6rem 0 3rem;
  background: var(--color-charcoal);
  color: var(--color-white);
}

.v5-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 4rem;
  margin-bottom: 4rem;
}

.v5-footer__brand .v5-brand { color: var(--color-white); }
.v5-footer__brand .v5-brand__mark span:nth-child(2) { background: var(--color-white); }

.v5-footer h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 2rem;
  color: rgba(255, 255, 255, 0.5);
}

.v5-footer ul { list-style: none; }
.v5-footer li { margin-bottom: 1rem; }
.v5-footer a {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.95rem;
  transition: color 0.3s;
}
.v5-footer a:hover { color: var(--color-primary-light); }

.v5-footer__bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.4);
}

@media (max-width: 1024px) {
  .v5-hero__grid, .v5-split, .v5-proof__grid, .v5-portfolio-grid, .v5-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }
}

@media (max-width: 768px) {
  .v5-hero__grid, .v5-split, .v5-proof__grid, .v5-portfolio-grid, .v5-footer__grid {
    grid-template-columns: 1fr;
  }
}