.app-header {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  position: fixed;
  top: 0;
  z-index: var(--z-header);
  height: 48px; /* Reduced height */
  width: 100%;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.header-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 15px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo and title styling */
.header-branding {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo-link {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--text-color);
  gap: 8px;
}

.app-logo {
  width: 24px;
  height: 24px;
}

.app-title {
  font-size: 1rem;
  font-weight: 600;
  margin: 0;
}

/* Navigation styling */
.main-nav {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
  margin-right: 1rem;
}

.nav-item {
  padding: 0.25rem 0.75rem;
  border-radius: var(--border-radius-xs);
  color: var(--text-color);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
  font-size: 0.9rem;
}

.nav-item:hover {
  background-color: var(--lora-surface-hover, oklch(95% 0.02 256));
}

.nav-item.active {
  background-color: var(--lora-accent);
  color: white;
}

/* Header search */
.header-search {
  flex: 1;
  max-width: 400px;
  margin: 0 1rem;
}

/* Header controls (formerly corner controls) */
.header-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.header-controls > div {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.header-controls > div:hover {
  background: var(--lora-accent);
  color: white;
  transform: translateY(-2px);
}

.theme-toggle .light-icon {
  opacity: 0;
}

.theme-toggle .dark-icon {
  opacity: 1;
}

[data-theme="light"] .theme-toggle .light-icon {
  opacity: 1;
}

[data-theme="light"] .theme-toggle .dark-icon {
  opacity: 0;
}

/* Mobile adjustments */
@media (max-width: 768px) {
  .app-title {
    display: none; /* Hide text title on mobile */
  }
  
  .header-controls {
    gap: 4px;
  }
  
  .header-controls > div {
    width: 28px;
    height: 28px;
  }
  
  .header-search {
    max-width: none;
    margin: 0 0.5rem;
  }
  
  .main-nav {
    margin-right: 0.5rem;
  }
}

/* For very small screens */
@media (max-width: 600px) {
  .header-container {
    padding: 0 8px;
  }
  
  .main-nav {
    display: none; /* Hide navigation on very small screens */
  }
  
  .header-search {
    flex: 1;
  }
}