.container {
  width: min(calc(100% - 2.5rem), var(--container));
  margin-inline: auto;
}

.container-wide {
  width: min(calc(100% - 2.5rem), var(--container-wide));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  height: var(--header-height);
  background: var(--color-charcoal);
  border-bottom: 1px solid transparent;
  transition: height 0.35s var(--ease), background 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.site-header.is-overlay {
  position: fixed;
  left: 0;
  right: 0;
  width: 100%;
  background: linear-gradient(to bottom, rgba(10, 10, 12, 0.78), transparent);
}

.site-header.is-scrolled,
.site-header.is-overlay.is-scrolled {
  height: var(--header-height-scrolled);
  background: rgba(17, 17, 17, 0.96);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.22);
  backdrop-filter: blur(16px);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

.brand {
  display: flex;
  align-items: center;
  min-width: 0;
  color: var(--color-white);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand-text strong {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.14em;
}

.brand-text span {
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.62);
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 1.15rem;
}

.desktop-nav a {
  color: rgba(255, 255, 255, 0.82);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  position: relative;
  padding: 0.2rem 0;
}

.desktop-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.2rem;
  width: 0;
  height: 1px;
  background: var(--color-white);
  transition: width 0.25s var(--ease);
}

.desktop-nav a:hover,
.desktop-nav a[aria-current="page"] {
  color: var(--color-white);
}

.desktop-nav a:hover::after,
.desktop-nav a[aria-current="page"]::after {
  width: 100%;
}

.header-cta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  position: relative;
  z-index: calc(var(--z-mobile) + 2);
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  margin: 5px auto;
  background: var(--color-white);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

body.menu-open .menu-toggle span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

body.menu-open .menu-toggle span:nth-child(2) {
  opacity: 0;
}

body.menu-open .menu-toggle span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

.mobile-nav {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100dvh;
  z-index: var(--z-mobile);
  background: var(--color-ink);
  color: var(--color-white);
  transform: translateX(100%);
  visibility: hidden;
  pointer-events: none;
  transition: transform 0.4s var(--ease), visibility 0.4s;
}

.mobile-nav.is-open {
  transform: none;
  visibility: visible;
  pointer-events: auto;
}

.mobile-nav-panel {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.mobile-nav-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  padding: 0 1.25rem;
  flex-shrink: 0;
  border-bottom: 1px solid var(--color-line-light);
}

.menu-close {
  color: var(--color-white);
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.6rem 0.2rem;
}

.mobile-nav-inner {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  padding: 1.5rem 1.5rem 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.mobile-nav-inner a {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 6vw, 2rem);
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--color-line-light);
}

.mobile-nav-inner a[aria-current="page"] {
  color: #9db4ff;
}

.mobile-cta {
  margin-top: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.site-footer {
  background: var(--color-white);
  border-top: 1px solid var(--color-line);
  padding-top: var(--space-2xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: var(--space-xl);
  padding-bottom: var(--space-2xl);
}

.footer-brand strong {
  display: block;
  font-family: var(--font-display);
  letter-spacing: 0.12em;
  margin-bottom: 0.35rem;
}

.footer-brand p,
.footer-col p,
.footer-col a {
  color: var(--color-muted);
  font-size: var(--text-sm);
}

.footer-col h2 {
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.footer-col a {
  display: block;
  padding: 0.22rem 0;
}

.footer-col a:hover {
  color: var(--color-ink);
}

.footer-bar {
  border-top: 1px solid var(--color-line);
  padding: 1rem 0;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--color-muted);
  font-size: var(--text-xs);
}

.back-to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: var(--z-fab);
  width: 48px;
  height: 48px;
  background: var(--color-ink);
  color: var(--color-white);
  display: grid;
  place-items: center;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}

.back-to-top:hover {
  background: var(--color-accent);
}

@media (max-width: 1200px) {
  .desktop-nav {
    display: none;
  }

  .header-cta .btn {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 700px) {
  .container,
  .container-wide {
    width: min(calc(100% - 1.5rem), var(--container));
  }

  .footer-grid,
  .footer-bar {
    grid-template-columns: 1fr;
    display: grid;
  }
}