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

:root {
  --primary-color: #000000;
  --secondary-color: #ffffff;
  --accent-color: #666666;
  --background-color: #fafafa;
  --text-color: #333333;
  --border-color: #e0e0e0;
  --spacing-unit: 1rem;
  --border-radius: 4px;
  --transition-speed: 0.3s;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans SC', 'Helvetica Neue', sans-serif;
  font-weight: 300;
  color: var(--text-color);
  background-color: var(--background-color);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Hero 区域 */
.hero {
  position: relative;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  color: var(--secondary-color);
  background-image: url('https://hpi-hub.tos-cn-beijing.volces.com/static/batch_3/1757212623390-9950.jpg');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.3);
}

.hero-content {
  position: relative;
  z-index: 1;
  padding: 2rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: 300;
  margin-bottom: 1rem;
  letter-spacing: 0.05em;
}

.hero p {
  font-size: clamp(1rem, 2.5vw, 1.5rem);
  margin-bottom: 2rem;
  font-weight: 300;
}

/* 按钮样式 */
.cta-button {
  display: inline-block;
  padding: 1rem 2rem;
  background-color: var(--primary-color);
  color: var(--secondary-color);
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: all var(--transition-speed) ease;
  font-weight: 400;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-size: 0.9rem;
}

.cta-button:hover {
  background-color: var(--secondary-color);
  color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* 导航样式 */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border-color);
}

nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 2rem;
}

nav a {
  color: var(--text-color);
  text-decoration: none;
  font-weight: 400;
  transition: color var(--transition-speed) ease;
  font-size: 0.95rem;
  letter-spacing: 0.02em;
}

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

/* 网格布局 */
.grid {
  display: grid;
  gap: 2rem;
  padding: 2rem;
  max-width: 1400px;
  margin: 0 auto;
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-item {
  position: relative;
  overflow: hidden;
  border-radius: var(--border-radius);
  background-color: var(--secondary-color);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  transition: transform var(--transition-speed) ease;
}

.grid-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.grid-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-speed) ease;
}

.grid-item:hover img {
  transform: scale(1.05);
}

.grid-item-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
  color: var(--secondary-color);
  padding: 2rem;
  transform: translateY(100%);
  transition: transform var(--transition-speed) ease;
}

.grid-item:hover .grid-item-content {
  transform: translateY(0);
}

/* Masonry 布局 */
.masonry {
  columns: 3;
  gap: 1.5rem;
  padding: 2rem;
  max-width: 1400px;
  margin: 0 auto;
}

.masonry-item {
  break-inside: avoid;
  margin-bottom: 1.5rem;
  position: relative;
  overflow: hidden;
  border-radius: var(--border-radius);
  background-color: var(--secondary-color);
}

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

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

.masonry-item-content {
  padding: 1rem;
  background-color: var(--secondary-color);
}

.masonry-item h3 {
  font-size: 1rem;
  font-weight: 400;
  margin-bottom: 0.5rem;
  color: var(--text-color);
}

.masonry-item p {
  font-size: 0.85rem;
  color: var(--accent-color);
  line-height: 1.4;
}

/* 全屏滚动故事 */
.story-section {
  height: 100vh;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.story-section img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -1;
}

.story-content {
  background: rgba(255, 255, 255, 0.9);
  padding: 3rem;
  max-width: 600px;
  text-align: center;
  border-radius: var(--border-radius);
  backdrop-filter: blur(5px);
}

.story-content h2 {
  font-size: 2rem;
  font-weight: 300;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.story-content p {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-color);
  font-weight: 300;
}

/* 页脚 */
footer {
  text-align: center;
  padding: 2rem;
  background-color: var(--primary-color);
  color: var(--secondary-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
  nav ul {
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 0.85rem;
  }
  
  .masonry {
    columns: 2;
  }
  
  .grid {
    padding: 1rem;
  }
  
  .story-content {
    padding: 2rem;
    margin: 1rem;
  }
}

@media (max-width: 480px) {
  nav ul {
    gap: 0.5rem;
  }
  
  nav a {
    font-size: 0.8rem;
  }
  
  .masonry {
    columns: 1;
  }
  
  .hero h1 {
    font-size: 1.8rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .story-content {
    padding: 1.5rem;
  }
  
  .story-content h2 {
    font-size: 1.5rem;
  }
}

/* 动画效果 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.8s ease-out;
}

/* 加载动画 */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-radius: 50%;
  border-top-color: var(--primary-color);
  animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* 自定义滚动条 */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--background-color);
}

::-webkit-scrollbar-thumb {
  background: var(--accent-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-color);
}