@import url('https://fonts.googleapis.com/css2?family=Nanum+Gothic&display=swap');

:root {
  /* Dark Mode (Default) */
  --bg-color: #2c3e50;
  --text-color: #ecf0f1;
  --card-bg-color: #34495e;
  --button-bg: #3498db;
  --button-hover-bg: #2980b9;
  --ball-text-color: #fff;
}

body.light-mode {
  /* Light Mode */
  --bg-color: #ecf0f1;
  --text-color: #2c3e50;
  --card-bg-color: #fff;
  --button-bg: #3498db;
  --button-hover-bg: #5dade2;
  --ball-text-color: #fff;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: 'Nanum Gothic', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  text-align: center;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.theme-switch-container {
  position: absolute;
  top: 20px;
  right: 20px;
  display: flex;
  align-items: center;
}

.theme-switch {
  display: inline-block;
  height: 24px;
  position: relative;
  width: 50px;
}

.theme-switch input {
  display:none;
}

.slider {
  background-color: #ccc;
  bottom: 0;
  cursor: pointer;
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
  transition: .4s;
  border-radius: 24px;
}

.slider:before {
  background-color: #fff;
  bottom: 3px;
  content: "";
  height: 18px;
  left: 4px;
  position: absolute;
  transition: .4s;
  width: 18px;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--button-bg);
}

input:checked + .slider:before {
  transform: translateX(26px);
}


main {
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--card-bg-color);
  padding: 40px;
  border-radius: 15px;
  box-shadow: 0 10px 20px rgba(0,0,0,0.1);
  transition: background-color 0.3s ease;
}

h1 {
  margin-top: 0;
  margin-bottom: 40px;
  font-size: 2.5em;
  font-weight: 600;
}

.lotto-container {
  margin-bottom: 40px;
}

.lotto-numbers {
  display: flex;
  justify-content: center;
  gap: 15px;
  flex-wrap: wrap;
}

.lotto-number {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 1.5em;
  font-weight: bold;
  color: var(--ball-text-color);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  animation: pop-in 0.5s cubic-bezier(0.68, -0.55, 0.27, 1.55);
}

#generate-btn {
  background-color: var(--button-bg);
  color: #fff;
  border: none;
  padding: 15px 30px;
  font-size: 1.2em;
  font-family: inherit;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.1s ease;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

#generate-btn:hover {
  background-color: var(--button-hover-bg);
}

#generate-btn:active {
  transform: scale(0.98);
}

@keyframes pop-in {
  0% {
    transform: scale(0);
    opacity: 0;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}