.box {
    width: 100%;
}

.box a {
    display: block;
    width: 100%;
    height: 100%;
}

.container {
  position: relative;
  width: 100%;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #fff;
}

.logo {
  position: absolute;
  z-index: 3;
  opacity: 1;
  animation: fadeOutLogo 0.8s ease 1.5s forwards;
}

.logo img {
  max-width: 400px;
  height: auto;
}

.gradient-bg {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(45deg, #a9c9ff 0%, #00ac9b 100%);
  transform: translateY(100%);
  z-index: 1;
  animation: rollUp 1.2s ease 1.5s forwards;
}

.main-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  z-index: 2;
  animation: fadeInImage 1.5s ease 2.7s forwards;
}

.content {
  position: relative;
  z-index: 4;
  opacity: 0;
  padding: 0 20px;
  animation: fadeInContent 1s ease 3s forwards;
  text-align: center;
}

.main-title {
  font-size: 3.5rem;
  font-weight: 700;
  margin: 0 0 1rem;
  letter-spacing: 0.1em;
  line-height: 1.4;
}

.sub-title {
  font-size: 1.2rem;
  font-weight: 300;
  margin: 0 0 2rem;
  letter-spacing: 0.05em;
}

.scroll-hint {
  position: absolute;
  bottom: 80px;
  left: 45%;
  transform: translateX(-50%);
  z-index: 4;
  opacity: 0;
  animation: fadeInContent 1s ease 4s forwards;
}

.scroll-hint::before {
  content: "";
  display: block;
  width: 1px;
  height: 80px;
  background: #fff;
  margin: 0 auto 10px;
  animation: scrollLine 1.5s ease-in-out infinite;
}

.scroll-text {
  font-size: 0.9rem;
  letter-spacing: 0.2em;
  white-space: nowrap;
}

@keyframes fadeOutLogo {
  0% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(-20px);
  }
}

@keyframes rollUp {
  0% {
    transform: translateY(100%);
  }
  100% {
    transform: translateY(0%);
  }
}

@keyframes fadeInImage {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 0.4;
  }
}

@keyframes fadeInContent {
  0% {
    opacity: 0;
    transform: translateY(20px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scrollLine {
  0% {
    height: 0;
    opacity: 0;
  }
  50% {
    height: 80px;
    opacity: 1;
  }
  100% {
    height: 0;
    opacity: 0;
  }
}

@media (max-width: 768px) {
  .main-title {
    font-size: 2.5rem;
  }
  .sub-title {
    font-size: 1.4rem;
  }
}