@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --color-bg: #FFFFFF;
  --color-text: #333333;
  --color-gray-light: #F8F8F8;
  --color-gold: #D4AF37;
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
}

.hero-slider {
  position: relative;
  height: 100vh;
  overflow: hidden;
}

.hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1s ease-in-out;
}

.hero-slide.active {
  opacity: 1;
  z-index: 1;
}

.hero-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.image-card {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  background-color: var(--color-gray-light);
}

.image-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition-smooth);
  display: block;
}

.image-card:hover img {
  transform: scale(1.05);
}

.image-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  opacity: 0;
  transition: var(--transition-smooth);
  padding: 2rem;
}

.image-card:hover .image-overlay {
  opacity: 1;
}

.overlay-text {
  color: white;
  font-size: 1rem;
  font-weight: 300;
  text-align: center;
  letter-spacing: 2px;
  transform: translateY(20px);
  transition: var(--transition-smooth);
}

.image-card:hover .overlay-text {
  transform: translateY(0);
}

.nav-link {
  position: relative;
  transition: var(--transition-smooth);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-gold);
  transition: var(--transition-smooth);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: 4px;
  text-align: center;
  margin-bottom: 3rem;
  color: var(--color-text);
}

.theme-nav {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.theme-btn {
  padding: 0.5rem 1.5rem;
  border: 1px solid var(--color-text);
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  transition: var(--transition-smooth);
  font-size: 0.875rem;
  letter-spacing: 2px;
}

.theme-btn:hover,
.theme-btn.active {
  background-color: var(--color-text);
  color: white;
}

.detail-card {
  background-color: var(--color-gray-light);
  padding: 1.5rem;
  transition: var(--transition-smooth);
}

.detail-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
}

.detail-text {
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--color-text);
  margin-top: 1rem;
}

.fade-in {
  animation: fadeIn 0.6s ease-in;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.parallax {
  transform: translateZ(0);
  will-change: transform;
}

@media (max-width: 768px) {
  .section-title {
    font-size: 1.25rem;
    letter-spacing: 2px;
  }
  
  .theme-nav {
    gap: 1rem;
  }
  
  .theme-btn {
    padding: 0.4rem 1rem;
    font-size: 0.75rem;
  }
}

img {
  image-rendering: -webkit-optimize-contrast;
  image-rendering: crisp-edges;
}

.lazy-load {
  opacity: 0;
  transition: opacity 0.5s ease-in;
}

.lazy-load.loaded {
  opacity: 1;
}