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

:root {
  --color-bg: #fafafa;
  --color-text: #1a1a1a;
  --color-border: #e0e0e0;
  --color-hover: #333;
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --spacing-unit: 1rem;
  --transition-fast: 0.2s ease;
  --transition-medium: 0.4s ease;
}

body {
  font-family: var(--font-main);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: calc(var(--spacing-unit) * 2) var(--spacing-unit);
  background-color: rgba(250, 250, 250, 0.95);
  backdrop-filter: blur(10px);
  z-index: 100;
  border-bottom: 1px solid var(--color-border);
}

nav a {
  margin: 0 calc(var(--spacing-unit) * 2);
  text-decoration: none;
  color: var(--color-text);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: color var(--transition-fast);
  position: relative;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-text);
  transition: width var(--transition-medium);
}

nav a:hover {
  color: var(--color-hover);
}

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

main {
  margin-top: 80px;
  min-height: calc(100vh - 140px);
}

.hero {
  width: 100%;
  height: 85vh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(10%);
}

.hero h1 {
  position: absolute;
  bottom: calc(var(--spacing-unit) * 4);
  left: 50%;
  transform: translateX(-50%);
  color: white;
  font-size: 2rem;
  font-weight: 300;
  letter-spacing: 0.2em;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
  opacity: 0.9;
}

.gallery {
  max-width: 1400px;
  margin: calc(var(--spacing-unit) * 6) auto;
  padding: 0 calc(var(--spacing-unit) * 3);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: calc(var(--spacing-unit) * 3);
}

.gallery img {
  width: 100%;
  height: auto;
  display: block;
  cursor: pointer;
  transition: transform var(--transition-medium), filter var(--transition-fast);
  filter: grayscale(20%);
}

.gallery img:hover {
  transform: scale(1.02);
  filter: grayscale(0%);
}

.material-card {
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.material-card img {
  transition: transform var(--transition-medium);
}

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

.material-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
  padding: calc(var(--spacing-unit) * 2);
  color: white;
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.material-card:hover .material-label {
  opacity: 1;
}

.color-section {
  margin-bottom: calc(var(--spacing-unit) * 6);
}

.color-section h2 {
  text-align: center;
  font-size: 1.2rem;
  font-weight: 300;
  letter-spacing: 0.15em;
  margin-bottom: calc(var(--spacing-unit) * 3);
  color: #666;
}

.color-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: calc(var(--spacing-unit) * 2);
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 calc(var(--spacing-unit) * 2);
}

.color-item {
  position: relative;
  overflow: hidden;
}

.color-item img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform var(--transition-medium);
}

.color-item:hover img {
  transform: scale(1.03);
}

.color-tag {
  position: absolute;
  top: calc(var(--spacing-unit) * 1.5);
  right: calc(var(--spacing-unit) * 1.5);
  background-color: rgba(255, 255, 255, 0.9);
  padding: 0.5rem 1rem;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  border-radius: 2px;
}

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.92);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  animation: fadeIn var(--transition-fast) forwards;
  cursor: pointer;
}

.overlay img {
  max-width: 90%;
  max-height: 90vh;
  object-fit: contain;
  animation: zoomIn var(--transition-medium) ease;
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

@keyframes zoomIn {
  from {
    transform: scale(0.9);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

footer {
  text-align: center;
  padding: calc(var(--spacing-unit) * 2);
  font-size: 0.7rem;
  color: #999;
  letter-spacing: 0.15em;
  border-top: 1px solid var(--color-border);
  margin-top: calc(var(--spacing-unit) * 6);
}

@media (max-width: 768px) {
  nav a {
    margin: 0 var(--spacing-unit);
    font-size: 0.8rem;
  }

  .hero h1 {
    font-size: 1.3rem;
  }

  .gallery {
    grid-template-columns: 1fr;
    gap: calc(var(--spacing-unit) * 2);
    padding: 0 var(--spacing-unit);
  }

  .color-grid {
    grid-template-columns: 1fr;
  }

  .color-section h2 {
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  nav {
    padding: var(--spacing-unit);
  }

  nav a {
    margin: 0 0.5rem;
    font-size: 0.7rem;
  }

  .hero {
    height: 70vh;
  }

  .hero h1 {
    font-size: 1rem;
    bottom: calc(var(--spacing-unit) * 2);
  }
}