.nickname-container {
  background: #fff;
  padding: 15px;
  border: 1px solid #ddd;
  margin: 20px auto;
  width: auto;
  display: flex;
  gap: 20px;
  box-shadow: 0px 0px 0px rgba(0,0,0,0.1);
  border-radius: 8px;
  justify-content: center;
}
.nickname-settings, .nickname-output-box {
  text-align: center;
}
.nickname-settings {
  flex: 1;
  max-width: 300px;
}
.nickname-output-box {
  flex: 2;
}
.nickname-button {
  background: #0073aa;
  font-weight: bold;
  font-size: 16px;
  color: white;
  border: none;
  padding: 10px 20px;
  cursor: pointer;
  border-radius: 3px;
  transition: background 0.3s ease;
  margin-top: 15px;
  width: 100%;
}
.nickname-button:hover { background: #005177; }
.nickname-button:active { transform: scale(0.95); }
.nickname-settings label,
.nickname-settings select,
.nickname-settings input [type="range"] {
  margin-bottom: 5px;
  padding: 5px;
  font-size: 14px;
  width: 100%;
}
#nickname-list .nickname-box {
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 10px;
  margin: 10px 0;
  background: #f9f9f9;
  font-size: 24px;
  font-weight: bold;
  text-align: center;
  word-wrap: break-word;
  overflow-wrap: break-word;
  hyphens: auto;
}
@media screen and (max-width: 600px) {
  .nickname-container {
    flex-direction: column;
    padding: 10px;
  }
  .nickname-settings, .nickname-output-box {
    width: 100%;
  }
  .nickname-button {
    font-size: 16px;
    padding: 12px;
  }
  #nickname-list .nickname-box {
    font-size: 18px;
  }
}
#nickname-list:empty::before {
  content: "? ? ?";
  font-size: 40px;
  font-weight: bold;
  color: #000;
  display: block;
  text-align: center;
  #padding: 20px;
}


@media screen and (max-width: 600px) {
  .nickname-container {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 10px;
  }
  .nickname-settings, .nickname-output-box {
    width: 100%;
    max-width: 100%;
    text-align: center;
  }
  .nickname-settings label {
    text-align: center;
    margin-top: 0;
    margin-bottom: 0;
  }
  .nickname-settings select,
  .nickname-settings input,
  .nickname-button {
    width: 90%;
    margin-left: auto;
    margin-right: auto;
  }
  #nickname-list .nickname-box {
    font-size: 18px;
    margin-left: auto;
    margin-right: auto;
  }
}