body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: #f0f2f5;
  color: #333;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0;
  padding: 20px;
}

h1 {
  font-size: 3em;
  margin-bottom: 20px;
  color: #1877f2;
}

#clocks-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
}

#buttons-container {
  margin-top: 30px;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}

#add-world-clock {
  background-color: #1877f2;
  color: white;
  border: none;
  padding: 15px 30px;
  font-size: 1.2em;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.3s;
}

#add-world-clock:hover {
  background-color: #166fe5;
}

#tenths-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: #ffffff;
  border: 1px solid #dfe3e8;
  border-radius: 8px;
  font-size: 1em;
  color: #333;
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}

#tenths-toggle input {
  width: 18px;
  height: 18px;
  accent-color: #1877f2;
}

/* Modal Styles */
.modal {
  display: none; 
  position: fixed; 
  z-index: 1; 
  left: 0;
  top: 0;
  width: 100%; 
  height: 100%; 
  overflow: auto; 
  background-color: rgb(0,0,0); 
  background-color: rgba(0,0,0,0.4); 
}

.modal-content {
  background-color: #fefefe;
  margin: 15% auto; 
  padding: 20px;
  border: 1px solid #888;
  width: 80%; 
  max-width: 500px;
  border-radius: 10px;
  text-align: center;
}

.close-button {
  color: #aaa;
  float: right;
  font-size: 28px;
  font-weight: bold;
}

.close-button:hover,
.close-button:focus {
  color: black;
  text-decoration: none;
  cursor: pointer;
}

#modal-city-list button {
    background-color: #fff;
    color: #333;
    border: 1px solid #ddd;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s;
    margin: 5px;
}

#modal-city-list button:hover {
    background-color: #f0f0f0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.delete-button {
    position: absolute;
    top: 10px;
    right: 10px;
    background: transparent;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: #aaa;
}

.delete-button:hover {
    color: #333;
}