.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(25, 49, 51, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.scroll-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: var(--color-lime);
  transition: width 0.1s linear;
  z-index: 1;
}

.header--scrolled {
  background: rgba(25, 49, 51, 0.96);
  box-shadow: 0 2px 24px rgba(0,0,0,0.15);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.header__logo {
  display: flex;
  align-items: center;
  transition: color var(--transition-fast);
}

.header__logo:hover {
  opacity: 1;
}

.header__logo img {
  height: 96px;
  width: auto;
  display: block;
  filter: brightness(0) saturate(100%) invert(100%) sepia(0%) saturate(100%) hue-rotate(0deg) brightness(1);
  transition: filter 0.5s ease;
}

.header__logo:hover img {
  filter: brightness(0) saturate(100%) invert(91%) sepia(30%) saturate(600%) hue-rotate(40deg) brightness(1.05);
}

.header__logo-icon {
  width: 36px;
  height: 36px;
  background: var(--color-lime);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  color: var(--color-dark-green);
}

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

.nav__link {
  font-size: 0.88rem;
  font-weight: 500;
  color: rgba(255,255,255,0.75);
  letter-spacing: 0.02em;
  padding: 6px 0;
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-lime);
  border-radius: 1px;
  transition: width var(--transition-base);
}

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

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

.nav__link:focus-visible {
  outline: 2px solid var(--color-lavender);
  outline-offset: 4px;
  border-radius: 2px;
}

.nav__cta {
  margin-left: 8px;
}

.nav__cta.btn {
  padding: 11px 36px;
  background-color: rgba(255,255,255,0.10);
  color: var(--color-white);
  border: 1.5px solid rgba(255,255,255,0.30);
}

.nav__cta.btn:hover {
  background-color: rgba(255,255,255,0.18);
  border-color: rgba(255,255,255,0.55);
  box-shadow: none;
  transform: translateY(-2px);
}

.nav__cta.btn::after {
  display: none;
}

.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  cursor: pointer;
  z-index: 1100;
}

.burger__line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-fast);
  transform-origin: center;
}

.burger.is-active .burger__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.burger.is-active .burger__line:nth-child(2) {
  opacity: 0;
}

.burger.is-active .burger__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-overlay {
  display: none;
}

@media (max-width: 900px) {
  .nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: min(85vw, 380px);
    height: 100vh;
    height: 100dvh;
    background: var(--color-dark-green);
    padding: calc(var(--header-height) + var(--spacing-lg)) var(--spacing-lg) var(--spacing-lg);
    transition: right var(--transition-base);
    z-index: 1050;
    overflow-y: auto;
  }

  .nav.is-open {
    right: 0;
  }

  .nav-overlay {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 1040;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
  }

  .nav-overlay.is-visible {
    opacity: 1;
    visibility: visible;
  }

  .nav__list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
  }

  .nav__link {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.8);
    padding: 8px 0;
  }

  .nav__cta {
    margin-left: 0;
    margin-top: var(--spacing-sm);
  }

  .burger {
    display: flex;
  }
}