.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  transition: all 0.3s ease;
  padding: 1.5rem 0;
}

.header.scrolled {
  padding: 1rem 0;
  background-color: #0a0a0a; 
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
}

.header__container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header__logo {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.header__logo .accent {
  color: var(--accent-primary);
}

.header__nav {
  display: none;
}

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

.header__menu {
  display: flex;
  gap: 2rem;
}

.header__link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
}

.header__link:hover,
.header__link.active {
  color: var(--text-primary);
}

.header__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: width 0.3s ease;
}

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

.header__hamburger {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 0.5rem;
  z-index: 101;
}

@media (min-width: 768px) {
  .header__hamburger {
    display: none;
  }
}

.header__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  transition: all 0.3s ease;
}

/* Mobile Menu State */
.header__hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.header__hamburger.active span:nth-child(2) {
  opacity: 0;
}



.header__hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(1px, 0px); 
  transform-origin: center;
}
.header__hamburger.active span:nth-child(2) {
   transform: rotate(-45deg) translate(1px, -1px); 
   transform-origin: center;
}

/* Mobile Nav Overlay */
.mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: var(--bg-color);
  z-index: 99;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.mobile-nav.active {
  opacity: 1;
  visibility: visible;
}

.mobile-nav__menu {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.mobile-nav__link {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
}