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

:root {
  --color-primary: #2c2c2c;
  --color-secondary: #6b6b6b;
  --color-light: #f5f5f5;
  --color-white: #ffffff;
  --color-border: #e0e0e0;
  --font-primary: 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  --transition: all 0.3s ease;
}

body {
  font-family: var(--font-primary);
  color: var(--color-primary);
  background-color: var(--color-white);
  line-height: 1.8;
  font-size: 16px;
  overflow-x: hidden;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--color-border);
}

nav .nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-md);
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
}

nav a {
  color: var(--color-secondary);
  text-decoration: none;
  font-size: 14px;
  letter-spacing: 2px;
  transition: var(--transition);
  position: relative;
}

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

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

nav a:hover::after {
  width: 100%;
}

nav a.active {
  color: var(--color-primary);
  font-weight: 500;
}

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

main {
  margin-top: 80px;
}

.hero {
  height: 90vh;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.9);
}

.hero-text {
  position: relative;
  z-index: 10;
  text-align: center;
  color: var(--color-white);
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 300;
  letter-spacing: 4px;
  text-shadow: 2px 2px 20px rgba(0, 0, 0, 0.3);
  padding: 0 var(--spacing-md);
}

section {
  padding: var(--spacing-xl) 0;
}

.section-intro {
  max-width: 900px;
  margin: 0 auto var(--spacing-xl);
  text-align: center;
  font-size: 18px;
  line-height: 2;
  color: var(--color-secondary);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.feature-item {
  background-color: var(--color-light);
  padding: var(--spacing-lg);
  transition: var(--transition);
}

.feature-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.feature-image {
  width: 100%;
  height: 400px;
  object-fit: cover;
  margin-bottom: var(--spacing-md);
}

.feature-title {
  font-size: 20px;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
  letter-spacing: 2px;
}

.feature-text {
  color: var(--color-secondary);
  line-height: 2;
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

.principle-item {
  padding: var(--spacing-md);
  border: 1px solid var(--color-border);
  transition: var(--transition);
}

.principle-item:hover {
  border-color: var(--color-primary);
}

.principle-image {
  width: 100%;
  height: 300px;
  object-fit: cover;
  margin-bottom: var(--spacing-sm);
}

.principle-title {
  font-size: 18px;
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
  letter-spacing: 1px;
}

.principle-text {
  color: var(--color-secondary);
  line-height: 1.8;
  font-size: 14px;
}

.story-section {
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--color-border);
}

.story-section:last-child {
  border-bottom: none;
}

.story-title {
  font-size: 28px;
  font-weight: 400;
  margin-bottom: var(--spacing-md);
  letter-spacing: 3px;
  text-align: center;
}

.story-images {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.story-image {
  width: 100%;
  height: 350px;
  object-fit: cover;
}

.story-text {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  color: var(--color-secondary);
  line-height: 2;
}

.closing-text {
  max-width: 700px;
  margin: var(--spacing-lg) auto 0;
  text-align: center;
  color: var(--color-secondary);
  font-style: italic;
  line-height: 2;
}

footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  text-align: center;
  padding: var(--spacing-md);
  font-size: 14px;
  letter-spacing: 2px;
}

@media (max-width: 768px) {
  nav .nav-container {
    gap: var(--spacing-md);
  }
  
  nav a {
    font-size: 12px;
  }
  
  .hero {
    height: 70vh;
  }
  
  .hero-text {
    font-size: 2rem;
  }
  
  section {
    padding: var(--spacing-lg) 0;
  }
  
  .feature-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .feature-image {
    height: 300px;
  }
  
  .principle-grid {
    grid-template-columns: 1fr;
  }
  
  .story-images {
    grid-template-columns: 1fr;
  }
  
  .story-image {
    height: 250px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  nav .nav-container {
    padding: var(--spacing-sm);
    gap: var(--spacing-sm);
  }
  
  .hero-text {
    font-size: 1.5rem;
    letter-spacing: 2px;
  }
  
  .section-intro {
    font-size: 16px;
  }
  
  .feature-item {
    padding: var(--spacing-md);
  }
}