.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  padding-block: var(--space-sm);
  transition: background var(--transition-base), box-shadow var(--transition-base), padding var(--transition-base);
}

.header.is-scrolled {
  background: rgba(250, 246, 239, 0.92);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-soft);
  padding-block: 0.6rem;
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo__img {
  height: 54px;
  width: auto;
}

.logo__sub {
  font-family: var(--font-body);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-on-dark);
  transition: color var(--transition-base);
}

.header.is-scrolled .logo__sub {
  color: var(--color-olive-dark);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav__link {
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--color-text-on-dark);
  position: relative;
  padding-bottom: 0.25rem;
  transition: color var(--transition-base);
}

.header.is-scrolled .nav__link {
  color: var(--color-text);
}

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

.nav__link:hover::after {
  width: 100%;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  z-index: 110;
}

.nav__toggle span {
  width: 26px;
  height: 2px;
  background: var(--color-text-on-dark);
  transition: transform var(--transition-base), opacity var(--transition-base), background var(--transition-base);
}

.header.is-scrolled .nav__toggle span {
  background: var(--color-olive-dark);
}


@media (max-width: 900px) {
  .nav__toggle {
    display: flex;
  }

  .logo__img {
    height: 40px;
  }

  .logo__sub {
    display: none;
  }

  .nav__list .nav__link {
    color: var(--color-text);
  }

  .nav__list {
    position: fixed;
    top: 0;
    right: 0;
    height: 100vh;
    width: 100%;
    background: var(--color-sand-light);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-lg);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    box-shadow: var(--shadow-strong);
  }

  .nav__list.is-open {
    transform: translateX(0);
  }

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

  .nav.is-open .nav__toggle span:nth-child(2) {
    opacity: 0;
  }

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