.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  transition:background-color var(--duration-normal) var(--ease-smooth),box-shadow var(--duration-normal) var(--ease-smooth),backdrop-filter var(--duration-normal) var(--ease-smooth);
}

.header--top {
  background-color: transparent;
  box-shadow: none;
}

.header--scrolled {
  background-color: var(--surface-dark-blur);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: var(--shadow-header);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  z-index: 1001;
  flex-shrink: 0;
}

.header__logo-img {
  height: 48px;
  width: auto;
  display: block;
  object-fit: contain;
}

.header__logo-text {
  display: flex;
  flex-direction: column;
}

.header__logo-name {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: var(--fw-bold);
  color: var(--color-white);
  line-height: 1.1;
  letter-spacing: 0.04em;
}

.header__logo-tagline {
  font-family: var(--font-body);
  font-size: var(--fs-xs);
  font-weight: var(--fw-light);
  color: rgba(255, 255, 255, 0.6);
  letter-spacing: var(--ls-ultra);
  text-transform: uppercase;
  margin-top: 2px;
}

.header__nav {
  display: none;
}

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

.header__nav-link {
  position: relative;
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: rgba(255, 255, 255, 0.8);
  letter-spacing: var(--ls-wide);
  text-transform: uppercase;
  padding: var(--space-xs) 0;
  transition: color var(--duration-fast) var(--ease-out);
}

.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1.5px;
  background-color: var(--color-terracotta);
  transition: width var(--duration-normal) var(--ease-smooth);
}

.header__nav-link:hover,
.header__nav-link.active {
  color: var(--color-white);
}

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

.header__cta {
  display: none;
  font-size: var(--fs-xs);
  padding: 0.65rem 1.5rem;
}

.header__burger {
  position: relative;
  z-index: 1001;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 36px;
  height: 36px;
  gap: 6px;
  padding: 4px;
}

.header__burger-line {
  display: block;
  width: 24px;
  height: 1.5px;
  background-color: var(--color-white);
  border-radius: 2px;
  transition:
    transform var(--duration-normal) var(--ease-smooth),
    opacity var(--duration-fast) var(--ease-smooth),
    width var(--duration-normal) var(--ease-smooth);
  transform-origin: center;
}

.header__burger.active .header__burger-line:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.header__burger.active .header__burger-line:nth-child(2) {
  opacity: 0;
  width: 0;
}

.header__burger.active .header__burger-line:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100dvh;
  background-color: var(--surface-dark);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--duration-slow) var(--ease-smooth),
    visibility var(--duration-slow) var(--ease-smooth);
}

.mobile-menu.open {
  opacity: 1;
  visibility: visible;
}

.mobile-menu__nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.mobile-menu__list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.mobile-menu__link {
  font-family: var(--font-heading);
  font-size: var(--fs-xl);
  font-weight: var(--fw-regular);
  color: rgba(255, 255, 255, 0.75);
  letter-spacing: 0.03em;
  padding: var(--space-xs) var(--space-sm);
  transition:
    color var(--duration-fast) var(--ease-out),
    transform var(--duration-normal) var(--ease-smooth);
  transform: translateY(20px);
  opacity: 0;
}

.mobile-menu.open .mobile-menu__link {
  transform: translateY(0);
  opacity: 1;
}

.mobile-menu.open .mobile-menu__list li:nth-child(1) .mobile-menu__link { transition-delay: 0.05s; }
.mobile-menu.open .mobile-menu__list li:nth-child(2) .mobile-menu__link { transition-delay: 0.10s; }
.mobile-menu.open .mobile-menu__list li:nth-child(3) .mobile-menu__link { transition-delay: 0.15s; }
.mobile-menu.open .mobile-menu__list li:nth-child(4) .mobile-menu__link { transition-delay: 0.20s; }
.mobile-menu.open .mobile-menu__list li:nth-child(5) .mobile-menu__link { transition-delay: 0.25s; }
.mobile-menu.open .mobile-menu__list li:nth-child(6) .mobile-menu__link { transition-delay: 0.30s; }

.mobile-menu__link:hover {
  color: var(--color-white);
}

.mobile-menu__cta {
  margin-top: var(--space-lg);
  font-size: var(--fs-sm);
  padding: 1rem 2.5rem;
  transform: translateY(20px);
  opacity: 0;
  transition:
    transform var(--duration-normal) var(--ease-smooth),
    opacity var(--duration-normal) var(--ease-smooth),
    background-color var(--duration-normal) var(--ease-smooth);
}

.mobile-menu.open .mobile-menu__cta {
  transform: translateY(0);
  opacity: 1;
  transition-delay: 0.35s;
}

@media (min-width: 768px) {
  .header__nav {
    display: block;
  }

  .header__nav-list {
    gap: var(--space-md);
  }

  .header__nav-link {
    font-size: var(--fs-xs);
  }

  .header__cta {
    display: inline-flex;
  }

  .header__burger {
    display: none;
  }

  .mobile-menu {
    display: none;
  }
}

@media (min-width: 1024px) {
  .header__nav-list {
    gap: var(--space-lg);
  }

  .header__nav-link {
    font-size: var(--fs-sm);
  }

  .header__cta {
    font-size: var(--fs-sm);
    padding: 0.75rem 1.8rem;
  }
}