.header {
  position: fixed;
  padding: 20px;
  top: 0;
  left: 0;
  right: 0;
  box-sizing: border-box;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
  background: var(--background-color);
}

.logo-container {
  display: flex;
  align-items: center;
}

.logo {
  height: 60px;
  width: auto;
  transition: all 0.3s ease-in-out;
  cursor: pointer;
}

.logo-main {
  display: block;
}

.logo-wordmark {
  display: none;
}

.site-title {
  text-decoration: none;
  color: var(--text-color);
  cursor: pointer;
  transition: opacity 0.2s;
}

.site-title:hover {
  opacity: 0.7;
}

.site-title .title-text {
  margin: 0;
}

.header-controls {
  display: flex;
  gap: 20px;
  align-items: center;
}

.lang-switch {
  padding: 5px 10px;
  border: 2px solid var(--text-color);
  background: rgba(255,255,255,0.1);
  color: var(--text-color);
  cursor: pointer;
} 

.theme-switch {
  width: 30px;
  height: 30px;
  border: 2px solid var(--text-color);
  background: var(--background-color);
  border-radius: 50%;
  cursor: pointer;
  position: relative;
  transition: all 0.3s ease;
}

.theme-switch.monochrome {
  background: #ffffff;
  border-color: #574038;
}

.theme-switch.monochrome:hover {
  background: #ECE7B0;
  border-color: #4E6858;
}

.theme-switch.colorful {
  background: #ECE7B0;
  border-color: #4E6858;
}

.theme-switch.colorful:hover {
  background: #fff;
  border-color: #574038;
}

@media (max-width: 768px) {
  .header {
    padding: 12px 16px;
  }

  .logo {
    height: 46px; /* smaller logo on mobile */
  }

  .site-title .title-text {
    font-size: 1.2rem;
  }

  .lang-switch {
    padding: 4px 8px;
    font-size: 0.875rem;
  }

  .theme-switch {
    width: 24px;
    height: 24px;
  }

  .header-controls {
    gap: 12px;
  }
}