header .wrapper {
    position: relative;
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}
header .wrapper h1 {
  margin-right: auto;
}
footer .wrapper {
  text-align: right;
  font-size: 0.9rem;
}
header .wrapper nav {
  display: flex;
  gap: 1rem;
}
header .wrapper nav a {
  padding-left: 1rem;
  border-left: 1px solid #000;
}
header .wrapper nav a:first-child {
  border-left: none;
}

.prev-next {
  display: flex;
  justify-content: space-between;
  width: 100%;
  margin-top: 2rem;
  margin-bottom: 2rem;
}
.prev-next a {
  text-decoration: none;
  color: inherit;
}
.prev-next a.next {
  margin-left: auto;
}
.prev-next a:hover {
  text-decoration: underline;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  gap: 0.4rem;
}
.menu-toggle span {
  width: 1.5rem;
  height: 2px;
  background: #333;
}
@media (max-width: 600px) {
  .menu-toggle {
    display: flex;
  }
  
  #nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 1rem;
    border: 1px solid #ccc;
    z-index: 1000;
  }
  
  #nav-menu.open {
    display: flex;
  }
}
.study-title {
    font-size: 24px;
    letter-spacing: -0.5px;
    line-height: 1.2;
    color: #666;
}
.sketch-title {
    font-size: 24px;
    letter-spacing: -0.5px;
    line-height: 1.2;
    color: #666;
}