/* ============================================
   Site Header — Sticky + Mobile Nav
   ============================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  height: var(--header-height);
  background: var(--color-white);
  transition: box-shadow var(--transition-base);
}

.site-header.scrolled {
  box-shadow: var(--shadow-md);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

/* Logo */
.site-logo {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-lg);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  line-height: 1;
}

.site-logo:hover {
  color: inherit;
}

.site-logo__red {
  color: var(--color-primary);
}

.site-logo__capital {
  color: var(--color-navy);
}

/* Desktop Navigation */
.main-nav {
  display: none;
  align-items: center;
  gap: var(--space-7);
}

.main-nav__link {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-charcoal);
  letter-spacing: 0.02em;
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.main-nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-base);
}

.main-nav__link:hover,
.main-nav__link.active {
  color: var(--color-primary);
}

.main-nav__link:hover::after,
.main-nav__link.active::after {
  width: 100%;
}

.main-nav .btn {
  padding: var(--space-2) var(--space-5);
  font-size: var(--fs-sm);
}

/* Mobile Menu Toggle */
.mobile-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  cursor: pointer;
  z-index: var(--z-overlay);
}

.mobile-toggle__bar {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-navy);
  border-radius: 2px;
  transition: all var(--transition-base);
  transform-origin: center;
}

.mobile-toggle.open .mobile-toggle__bar:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-toggle.open .mobile-toggle__bar:nth-child(2) {
  opacity: 0;
}

.mobile-toggle.open .mobile-toggle__bar:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Navigation Overlay */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  background: var(--color-white);
  padding: calc(var(--header-height) + var(--space-8)) var(--space-5) var(--space-8);
  flex-direction: column;
  gap: var(--space-2);
}

.mobile-nav.open {
  display: flex;
}

.mobile-nav__link {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--fs-xl);
  font-weight: var(--fw-medium);
  color: var(--color-navy);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-gray-light);
  transition: color var(--transition-fast);
}

.mobile-nav__link:hover,
.mobile-nav__link.active {
  color: var(--color-primary);
}

.mobile-nav .btn {
  margin-top: var(--space-4);
  width: 100%;
  text-align: center;
}

/* Desktop breakpoint */
@media (min-width: 1024px) {
  .main-nav {
    display: flex;
  }

  .mobile-toggle {
    display: none;
  }

  .site-header__inner {
    padding: 0 var(--space-8);
  }
}