/* layout.css - Modern Clean Grid & Navigation */
.container {
  width: 100%;
  max-width: 1380px;
  margin: 0 auto;
  padding: 0 var(--space-6);
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--space-8);
  }
}

section {
  padding: var(--space-16) 0;
  position: relative;
}

@media (min-width: 768px) {
  section {
    padding: var(--space-24) 0;
  }
}

/* Background Variations */
.section-light {
  background-color: var(--bg-main);
}

.section-subtle {
  background-color: var(--bg-subtle);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.section-dark {
  background-color: var(--bg-dark);
  color: var(--text-inverse);
  position: relative;
}

.section-brand {
  background-color: var(--brand-blue-dark);
  color: var(--text-inverse);
  position: relative;
}

/* Header & Sticky Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-light);
  transition: all var(--transition-normal);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
}

.site-header.scrolled {
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-md);
  border-bottom-color: var(--border-medium);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
  transition: height var(--transition-normal);
}

.site-header.scrolled .nav-container {
  height: 70px;
}

.brand-logo-link {
  display: grid;
  align-items: center;
  text-decoration: none;
}

.brand-logo-text, .brand-logo-img {
  grid-area: 1 / 1;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.brand-logo-text {
  font-family: 'Inter', sans-serif;
  font-weight: 900;
  font-size: 1.4rem;
  color: var(--brand-blue);
  letter-spacing: -0.02em;
  text-transform: uppercase;
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.brand-logo-text span {
  color: var(--text-main);
  font-weight: 800;
}

.site-header.scrolled .brand-logo-text {
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
}

.brand-logo-img {
  height: 42px;
  width: auto;
  max-width: 220px;
  object-fit: contain;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
}

.site-header.scrolled .brand-logo-img {
  height: 42px;
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-links {
  display: none;
  gap: var(--space-8);
  align-items: center;
}

@media (min-width: 1024px) {
  .nav-links {
    display: flex;
  }
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
  position: relative;
  padding: var(--space-2) 0;
  transition: color var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
  color: var(--brand-blue);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--brand-gold);
  transition: width var(--transition-normal);
}

.nav-link:hover::after, .nav-link.active::after {
  width: 100%;
}

.nav-cta {
  margin-left: var(--space-4);
}

.mobile-menu-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 38px;
  height: 38px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-btn span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--text-main);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

@media (min-width: 1024px) {
  .mobile-menu-btn {
    display: none;
  }
}

/* Footer */
.site-footer {
  background-color: var(--bg-dark);
  color: var(--text-inverse-muted);
  border-top: 1px solid var(--border-dark);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
  padding-bottom: var(--space-12);
  border-bottom: 1px solid var(--border-dark);
}

@media (min-width: 768px) {
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-top {
    grid-template-columns: 1.8fr 1fr 1fr 1.2fr;
  }
}

.footer-logo {
  background-color: #FFFFFF;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  display: inline-block;
  margin-bottom: var(--space-4);
}

.footer-logo img {
  height: 64px;
  width: auto;
  object-fit: contain;
}

.footer-col h4 {
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-inverse);
  margin-bottom: var(--space-4);
  font-weight: 700;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-links a {
  color: var(--text-inverse-muted);
  font-size: var(--text-sm);
}

.footer-links a:hover {
  color: var(--brand-gold);
}

.footer-bottom {
  padding-top: var(--space-8);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  font-size: var(--text-sm);
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
  }
}

/* CAARVN Labs Attribution */
.footer-bottom-right {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .footer-bottom-right {
    align-items: flex-end;
  }
}

.footer-tagline {
  color: var(--text-light, #a0aec0);
}

.caarvn-attribution {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
  opacity: 1;
  width: max-content;
  transition: transform 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  transform-origin: center center;
}

@media (min-width: 768px) {
  .caarvn-attribution {
    align-items: flex-end;
    transform-origin: center right;
  }
}

.caarvn-attribution:hover {
  transform: scale(1.03);
}

.caarvn-logo {
  width: 100%;
  max-width: 240px;
  aspect-ratio: 4.5 / 1;
  object-fit: cover;
  object-position: center;
  display: block;
  border-radius: var(--radius-sm);
}

.caarvn-text {
  font-size: 13px;
  line-height: 1.5;
  text-align: center;
  color: var(--text-light, #a0aec0);
}

@media (min-width: 768px) {
  .caarvn-text {
    text-align: right;
  }
}

.caarvn-brand {
  text-decoration: underline;
  font-weight: 500;
}

/* ==========================================================================
   MOBILE RESPONSIVE OVERRIDES
   ========================================================================== */
@media (max-width: 767px) {
  .nav-container {
    height: 64px;
  }

  .site-header.scrolled .nav-container {
    height: 56px;
  }

  .brand-logo-text {
    font-size: 1.1rem;
  }

  .brand-logo-img {
    height: 32px;
  }

  .site-header.scrolled .brand-logo-img {
    height: 32px;
  }

  /* Mobile menu overlay */
  .nav-links.mobile-open {
    display: flex !important;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: #FFFFFF;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-medium);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    gap: var(--space-4);
    z-index: 999;
  }

  .nav-links.mobile-open .nav-link {
    padding: var(--space-3) 0;
    font-size: var(--text-base);
    border-bottom: 1px solid var(--border-light);
  }

  .nav-links.mobile-open .nav-cta {
    margin-left: 0;
    margin-top: var(--space-2);
    width: 100%;
    text-align: center;
  }

  /* Footer mobile */
  .site-footer {
    padding: var(--space-12) 0 var(--space-6);
  }

  .footer-top {
    gap: var(--space-8);
    padding-bottom: var(--space-8);
  }

  .footer-logo img {
    height: 48px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--space-6);
    padding-top: var(--space-6);
  }

  .footer-bottom-right {
    align-items: center;
  }

  .caarvn-attribution {
    align-items: center;
  }

  .caarvn-text {
    text-align: center;
  }

  .caarvn-logo {
    max-width: 200px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-4);
  }

  .nav-container {
    height: 56px;
  }

  .brand-logo-text {
    font-size: 0.95rem;
  }

  section {
    padding: var(--space-12) 0;
  }

  .footer-logo {
    padding: 6px 10px;
  }

  .footer-logo img {
    height: 40px;
  }

  .footer-col h4 {
    font-size: var(--text-xs);
  }

  .caarvn-logo {
    max-width: 180px;
  }
}