body { 
  font-family: 'Inter', sans-serif;
  background: #121212;
  color: #e0e0e0;
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  line-height: 1.6;
}
.nav {
  text-align: center;
  padding: 10px;
  background: #1e1e1e;
  border-bottom: 1px solid #333;
}
.nav a {
  margin: 0 10px;
  text-decoration: none;
  color: #4ade80;
  font-weight: 600;
}
.nav a:hover {
  color: #22c55e;
}
h1 {
  font-size: 2em;
  text-align: center;
  margin: 20px 0;
  color: #fff;
}
.main-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
}
#custom-words-section {
  text-align: center;
  margin-bottom: 20px;
}
#custom-words-section label {
  display: block;
  margin-bottom: 5px;
  color: #fff;
}
#customWordsInput {
  width: 300px;
  padding: 8px;
  margin: 5px;
  border: 1px solid #333;
  border-radius: 5px;
  background: #2a2a2a;
  color: #e0e0e0;
}
#grid-container { 
  display: grid; 
  grid-template-columns: repeat(10, 40px); 
  gap: 0; 
  background: #1e1e1e;
  border: 1px solid #333;
  border-radius: 8px;
  padding: 5px;
}
.cell { 
  height: 40px; 
  border: 1px solid #333; 
  display: flex; 
  align-items: center; 
  justify-content: center; 
  cursor: pointer; 
  font-weight: bold; 
  font-size: 1.4em; 
  background: #2a2a2a; 
  color: #e0e0e0;
  box-sizing: border-box; 
}
.cell:hover {
  background: #333;
}
.cell.selected, .cell.found-cell {
  background: #4ade80 !important;
  color: #000 !important;
}
.cell.found-cell {
  background: #4ade80 !important;
  color: #000 !important;
  opacity: 0.8;
}
#word-list { 
  text-align: center; 
  margin: 0;
  min-width: 150px;
  background: #1e1e1e;
  padding: 15px;
  border-radius: 8px;
  border: 1px solid #333;
}
#word-list ul { 
  list-style: none; 
  padding: 0;
  margin: 0 0 15px 0;
}
#word-list li { 
  font-size: 1.2em; 
  margin: 8px 0; 
  position: relative;
  padding-left: 20px;
  color: #bbb;
}
#word-list li.found::before {
  content: "✓ ";
  color: #4ade80;
  font-weight: bold;
  position: absolute;
  left: 0;
}
#word-list li.found {
  color: #4ade80;
  text-decoration: line-through;
}
button { 
  padding: 10px 20px; 
  background: #4ade80; 
  color: #000;
  border: none; 
  border-radius: 5px; 
  font-size: 1.1em; 
  cursor: pointer; 
  margin: 5px;
  font-weight: 600;
}
button:hover { 
  background: #22c55e; 
}

/* Desktop layout: side by side */
@media (min-width: 768px) {
  .main-content {
    flex-direction: row;
    justify-content: center;
    gap: 30px;
  }
  #grid-container {
    flex: 0 0 auto;
  }
  #word-list {
    flex: 0 0 200px;
    text-align: left;
  }
  #word-list ul {
    text-align: left;
  }
  #word-list li {
    text-align: left;
    margin: 10px 0;
  }
  button {
    display: block;
    width: 100%;
    margin: 10px 0;
  }
  #customWordsInput {
    width: 400px;
  }
}

/* Mobile: vertical stack */
@media (max-width: 767px) { 
  #grid-container { 
    grid-template-columns: repeat(10, 8vw); 
  } 
  .cell { 
    height: 8vw; 
    font-size: 1.6em; 
  } 
  #word-list {
    width: 100%;
  }
  .main-content {
    padding: 10px;
  }
  #customWordsInput {
    width: 250px;
  }
}