/* Header Styles */
header {
  line-height: var(--line-height-none);
  padding-top: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  background-color: var(--color-header-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: var(--z-header);
}

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

.header-logo {
  color: var(--color-accent);
  font-size: 30px;
  font-weight: bold;
  text-decoration: none;
  transition: transform var(--transition-slow);
}

.header-nav {
  display: flex;
}

.nav-list {
  display: flex;
  list-style-type: none;
  gap: var(--spacing-sm);
}

.nav-link {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-fast);
}

.nav-link:hover::after {
  width: 100%;
}

.theme-toggle {
  display: flex;
  align-items: center;
  border-radius: var(--border-radius-sm);
  transition: var(--transition-fast);
  margin-left: var(--spacing-lg);
}

.theme-toggle img{
  width: var(--header-icons-size);
  height: auto;
}

.theme-toggle-button {
  background-color: transparent;
  padding: 6px var(--spacing-sm) var(--spacing-xs);
  border: none;
  cursor: pointer;
  line-height: var(--line-height-none);
}

.menu-toggle {
  display: none;
}

/* Mobile Responsive Styles */
@media (max-width: 768px) {
  .header-content {
    position: relative;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  
  .menu-toggle {
    display: flex;
    align-items: center;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
  }

  .menu-toggle-button {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    width: var(--spacing-md);
    height: var(--spacing-md);
    background: none;
    border: none;
    cursor: pointer;
    padding: 12px 12px;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
    box-sizing: content-box;
    outline: none;
    -webkit-tap-highlight-color: transparent;
  }

  .menu-toggle-bar {
    display: block;
    width: var(--spacing-md);
    height: 1px;
    background-color: var(--color-text-primary);
    transition: transform var(--transition-fast), opacity var(--transition-fast);
    transform-origin: center center;
    position: relative;
  }

  .menu-toggle-active .menu-toggle-button .menu-toggle-bar:nth-child(1),
  .menu-toggle-active .menu-toggle-button .menu-toggle-bar:nth-child(3) {
    width: var(--spacing-lg);
  }

  .menu-toggle-active .menu-toggle-button .menu-toggle-bar:nth-child(1) {
    transform: translateY(5.5px) rotate(45deg);
  }

  .menu-toggle-active .menu-toggle-button .menu-toggle-bar:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle-active .menu-toggle-button .menu-toggle-bar:nth-child(3) {
    transform: translateY(-5.5px) rotate(-45deg);
  }

  .theme-toggle {
    margin-left: var(--spacing-md);
  }
  
  .nav-list {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100vw;
    background-color: var(--color-background);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-xl);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    z-index: var(--z-dropdown);
  }

  .nav-list-active {
    opacity: 1;
    visibility: visible;
    pointer-events: all;
  }

  .no-scroll {
    overflow: hidden;
  }

  .nav-list li {
    margin: 0;
    opacity: 1;
    transform: none;
  }

  .nav-link {
    text-align: center;
    font-size: var(--font-size-h2);
    padding: var(--spacing-md) var(--spacing-lg);
  }

  .nav-link::after,
  .nav-link:hover::after {
    content: none;
    width: 0;
    height: 0;
  }

  .nav-list li:nth-child(1) { transition-delay: 0.05s; }
  .nav-list li:nth-child(2) { transition-delay: 0.1s; }
  .nav-list li:nth-child(3) { transition-delay: 0.15s; }
  .nav-list li:nth-child(4) { transition-delay: 0.2s; }
  .nav-list li:nth-child(5) { transition-delay: 0.25s; }
  .nav-list li:nth-child(6) { transition-delay: 0.3s; }
  .nav-list li:nth-child(7) { transition-delay: 0.35s; }
  .nav-list li:nth-child(8) { transition-delay: 0.4s; }
  .nav-list li:nth-child(9) { transition-delay: 0.45s; }
  .nav-list li:nth-child(10) { transition-delay: 0.5s; }

  .nav-list-active li {
    opacity: 1;
  }
}

/* Hover Styles */
@media (hover: hover) {
  .header-logo:hover {
    color: var(--color-accent-hover);
  }

  .menu-toggle:hover {
    background-color: var(--color-background-tertiary);
  }
  
  .theme-toggle:hover {
    background-color: var(--color-background-tertiary);
  }
}