:root {
  --bg-color: #ffffff;
  --text-color: #d3d3d3;
  --slider-bg-color: #ccc;
  --slider-checked-bg: #d1d1d1;
  --slider-button-bg: #fff;
}

[data-theme="dark"] {
  --bg-color: #1e1e2f;
  --text-color: #1d1d1d;
  --slider-bg-color: #666;
  --slider-checked-bg: #e4e4e4;
}

body {
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: 'Noto Sans KR', sans-serif;
  text-align: center;
  position: relative;
  overflow: hidden;
  transition: background-color 1s ease-in-out;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

#background-element {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  opacity: 1;
  transition: opacity 2s ease-in-out;
}

#background-video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  display: block; /* 비디오 요소가 보이도록 설정 */
  transition: opacity 1.5s cubic-bezier(0.4, 0, 0.2, 1);
}

#background-video source {
  display: none;
}

#background-video source:first-child {
  display: block;
}

.theme-switch-wrapper {
  position: absolute;
  top: 20px;
  right: 20px;
  z-index: 10;
}

.theme-switch {
  position: relative;
  display: inline-block;
  width: 80px;
  height: 40px;
}

.theme-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--slider-bg-color);
  transition: 0.4s;
  border-radius: 34px;
  display: flex;
  justify-content: space-between;
  padding: 0 10px;
  align-items: center;
}

.icon {
  position: absolute;
  font-size: 1.2rem;
  color: var(--text-color);
}

.sun-icon {
  left: 10px;
}

.moon-icon {
  right: 10px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 30px;
  width: 30px;
  border-radius: 50%;
  left: 4px;
  bottom: 4px;
  background-color: var(--slider-button-bg);
  transition: 0.4s;
}

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

input:checked + .slider:before {
  transform: translateX(40px);
}

input:checked + .slider .moon-icon {
  display: none;
}

input:not(:checked) + .slider .sun-icon {
  display: none;
}

.countdown-container {
  text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.5);
  z-index: 2;
  transition: opacity 0.5s ease-in-out;  /* 페이드 효과 추가 */
}

.countdown {
  font-family: 'Cinzel', serif;
  font-size: 4rem;
  letter-spacing: 0.1rem;
  margin-bottom: 1rem;
  animation: glow 1.5s infinite alternate;
  display: flex;  /* 수평 정렬을 위한 flexbox 추가 */
  justify-content: center;
  align-items: center;
  gap: 1rem;  /* 간격 조정 */
  transition: opacity 0.5s ease-in-out;  /* 페이드 효과 추가 */
}

@keyframes glow {
  from {
      text-shadow: 0 0 5px var(--text-color), 0 0 10px var(--text-color);
  }
  to {
      text-shadow: 0 0 10px var(--text-color), 0 0 20px var(--text-color);
  }
}

.message {
  font-size: 1.2rem;
  margin-top: 0.5rem;
  opacity: 0.8;
  transition: opacity 0.5s ease-in-out;  /* 페이드 효과 추가 */
}

.digit, .colon {
  display: inline-block;
  vertical-align: middle;
  line-height: 1;
}

.colon {
  font-size: 4rem;  /* 숫자와 동일한 크기로 변경 */
  margin: 0 0.2rem;  /* 좌우 간격 조정 */
  opacity: 0.7;
}

.digit {
  font-size: 4rem;
  opacity: 1;
  transition: opacity 0.3s ease-in-out;
  position: relative;
}

.digit.animate {
  animation: simpleFade 0.3s ease-in-out;
}

@keyframes simpleFade {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

.digit.animate-out {
  transform: scale(0.8);
  opacity: 0;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-10px);
  }
  60% {
    transform: translateY(-5px);
  }
}

.icon-container {
  position: fixed;
  bottom: 30px;
  width: 100%;
  display: flex;
  justify-content: center;
  gap: 25px;
  z-index: 10;
}

.icon-link {
  color: var(--text-color);
  font-size: 2rem;
  opacity: 0.7;
  transition: all 0.3s ease;
  text-decoration: none;
  display: flex;           /* 추가 */
  align-items: center;     /* 추가 */
  justify-content: center; /* 추가 */
}

.kakao-icon {
  width: 2rem;
  height: 2rem;
  color: var(--text-color); /* 다른 아이콘과 같은 색상 사용 */
  opacity: 0.7;            /* 다른 아이콘과 동일한 투명도 */
  transition: all 0.3s ease;
}

.icon-link:hover .kakao-icon {
  opacity: 1;
  color: var(--accent-color); /* hover 시 accent 색상으로 변경 */
}

.icon-link:hover {
  opacity: 1;
  transform: translateY(-5px);
}

.icon-link:hover .kakao-icon {
  filter: invert(1);    /* hover 시 완전히 밝게 */
}

.fade-in {
  opacity: 1 !important;
}

/* 페이드 효과를 위한 클래스 추가 */
.fade-out {
  opacity: 0;
}