:root {
  --nav-height: 68px;
  --nav-scroll-offset: 90px;
}

#hero,
#for-whom,
#program,
#training,
#results,
#tariffs,
#faq {
  scroll-margin-top: var(--nav-scroll-offset);
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 200;
  background-color: var(--color-bg);
  border-bottom: 1px solid rgba(21, 37, 51, 0.08);
}

.site-nav__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--nav-height);
}

.site-nav__brand {
  display: none;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text);
}

/* Toggle — mobile only */

.site-nav__toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  padding: 0;
  font-family: var(--font-primary);
  background: transparent;
  border: none;
  cursor: pointer;
}

.site-nav__burger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 1.25rem;
  height: 1.25rem;
}

.site-nav__burger-line {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-nav.is-open .site-nav__burger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-nav.is-open .site-nav__burger-line:nth-child(2) {
  opacity: 0;
}

.site-nav.is-open .site-nav__burger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav__toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* Menu */

.site-nav__menu {
  display: none;
  flex-direction: column;
  align-items: stretch;
  gap: 0.875rem;
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav__link {
  display: block;
  min-height: 44px;
  padding: 0.75rem 0;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text);
  transition: color var(--transition-fast);
}

.site-nav__link:hover,
.site-nav__link.is-active {
  color: var(--color-accent);
}

.site-nav__link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.site-nav__cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  align-self: stretch;
  min-height: 44px;
  padding: 0.75rem 1.125rem;
  font-family: var(--font-primary);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-bg);
  background-color: var(--color-accent);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.site-nav__cta:hover {
  background-color: var(--color-accent-hover);
}

.site-nav__cta:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* Mobile / tablet nav */

@media (max-width: 1099px) {
  .site-nav__brand {
    display: block;
    flex: 1;
    min-width: 0;
  }

  .site-nav__toggle {
    display: inline-flex;
  }

  .site-nav__menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 199;
    overflow-y: auto;
    padding: 1rem 20px 1.5rem;
    background-color: var(--color-bg);
    border-top: 1px solid rgba(21, 37, 51, 0.08);
  }

  .site-nav.is-open .site-nav__menu {
    display: flex;
  }
}

@media (max-width: 480px) {
  .site-nav__menu {
    padding-inline: 16px;
  }
}

/* Desktop */

@media (min-width: 1100px) {
  .site-nav__inner {
    justify-content: flex-end;
  }

  .site-nav__menu {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    gap: 1.25rem;
  }

  .site-nav__list {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: clamp(0.75rem, 1.4vw, 1.375rem);
  }

  .site-nav__link {
    min-height: auto;
    padding: 0.375rem 0;
    font-size: 0.6875rem;
    font-weight: 500;
    letter-spacing: 0.06em;
  }

  .site-nav__link.is-active {
    position: relative;
  }

  .site-nav__link.is-active::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 1px;
    background-color: var(--color-accent);
  }

  .site-nav__cta {
    flex-shrink: 0;
    align-self: center;
    width: auto;
    min-height: auto;
    padding: 0.6875rem 1.125rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-nav__burger-line {
    transition: none;
  }
}