body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  background: linear-gradient(135deg, #f0f4f8, #d9e2ec);
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color: #333;
}

h1 {
  color: #2c3e50;
  margin-bottom: 20px;
  font-size: 2.5em;
  text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
}

.lotto-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
  padding: 30px;
  border-radius: 15px;
  background-color: #ffffff;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  max-width: 650px;
  width: 90%;
  border: 1px solid #e0e6ed;
}

.input-group {
    display: flex;
    flex-wrap: wrap; /* Allow wrapping on small screens */
    justify-content: center;
    gap: 15px;
    align-items: center;
    margin-bottom: 15px;
}

.input-group label {
    font-weight: 600;
    color: #4a6572;
}

.input-group input[type="number"] {
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid #c8d3db;
    width: 70px;
    text-align: center;
    font-size: 1.1em;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.input-group input[type="number"]:focus {
    border-color: #007bff;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
    outline: none;
}

button {
  padding: 12px 25px;
  font-size: 1.1em;
  cursor: pointer;
  border: none;
  border-radius: 8px;
  color: white;
  transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

button:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

button:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

button:disabled {
  background-color: #aebfd4;
  cursor: not-allowed;
  box-shadow: none;
}

#generate {
  background-color: #28a745; /* Green */
}
#generate:hover:not(:disabled) {
  background-color: #218838;
}

#copy {
  background-color: #007bff; /* Blue */
}
#copy:hover:not(:disabled) {
  background-color: #0069d9;
}

#reset {
  background-color: #dc3545; /* Red */
}
#reset:hover:not(:disabled) {
  background-color: #c82333;
}

#save-state, #load-state {
  background-color: #6c757d; /* Grey */
}
#save-state:hover:not(:disabled), #load-state:hover:not(:disabled) {
  background-color: #5a6268;
}

#clear-history {
    background-color: #ffc107; /* Yellow */
    color: #333;
    padding: 8px 15px;
    font-size: 0.9em;
    margin-bottom: 10px;
}
#clear-history:hover:not(:disabled) {
    background-color: #e0a800;
    color: #333;
}


.numbers-container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
  margin-bottom: 25px;
}

.number-ball {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  font-size: 1.8em;
  font-weight: bold;
  color: white;
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  flex-shrink: 0; /* Prevent shrinking on small screens */
}

.number-ball:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}

.history-section {
  width: 100%;
  margin-top: 30px;
  border-top: 2px solid #e9ecef;
  padding-top: 25px;
  text-align: center;
}

.history-section h3 {
  color: #4a6572;
  margin-bottom: 20px;
  font-size: 1.6em;
}

#history-container {
  max-height: 250px;
  overflow-y: auto;
  border: 1px solid #dee2e6;
  background-color: #f8f9fa;
  padding: 15px;
  border-radius: 10px;
  text-align: left;
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.05);
}

.history-item {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px dotted #ced4da;
  align-items: center;
}

.history-item:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.history-item .number-ball {
    width: 40px;
    height: 40px;
    font-size: 1.1em;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* Responsive Adjustments */
@media (max-width: 768px) {
  h1 {
    font-size: 2em;
  }
  .lotto-container {
    padding: 20px;
    gap: 15px;
  }
  .input-group {
    flex-direction: column;
    gap: 10px;
  }
  .input-group label {
    width: 100%;
    text-align: center;
  }
  .input-group input {
    width: calc(100% - 24px); /* Account for padding and border */
    max-width: 100px;
  }
  .buttons-container, .action-buttons {
    flex-direction: column;
    gap: 10px;
  }
  button {
    width: 100%;
    padding: 10px 15px;
    font-size: 1em;
  }
  .number-ball {
    width: 50px;
    height: 50px;
    font-size: 1.5em;
  }
  .history-item .number-ball {
    width: 35px;
    height: 35px;
    font-size: 1em;
  }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.8em;
    }
    .lotto-container {
        border-radius: 10px;
    }
    .number-ball {
        width: 45px;
        height: 45px;
        font-size: 1.3em;
    }
    .history-item .number-ball {
        width: 30px;
        height: 30px;
        font-size: 0.9em;
    }
}