/* 全局样式定义 */
:root {
  --primary-gray: #404040;
  --oatmeal: #D3C8BD;
  --matte-black: #1A1A1A;
  --terracotta: #E2725B;
  --sage-green: #87A96B;
  --cream-white: #FDFBF9;
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 基础重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
  background-color: var(--cream-white);
  color: var(--primary-gray);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 导航栏样式 */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(253, 251, 249, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  padding: 1rem 2rem;
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-links {
  display: flex;
  gap: 3rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--primary-gray);
  font-size: 0.95rem;
  font-weight: 300;
  transition: var(--transition-smooth);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--primary-gray);
  transition: width 0.3s ease;
}

.nav-links a:hover::after {
  width: 100%;
}

/* 主容器 */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 6rem 2rem 2rem;
}

/* 图片悬停效果 */
.image-hover {
  overflow: hidden;
  cursor: pointer;
}

.image-hover img {
  transition: transform 0.6s ease;
}

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

/* 按钮样式 */
.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  background: transparent;
  border: 1px solid var(--primary-gray);
  color: var(--primary-gray);
  text-decoration: none;
  transition: var(--transition-smooth);
  cursor: pointer;
}

.btn:hover {
  background: var(--primary-gray);
  color: var(--cream-white);
}

/* 页脚样式 */
footer {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--primary-gray);
  font-size: 0.85rem;
  opacity: 0.6;
}

/* 文本样式 */
h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 200;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: 300;
  margin-bottom: 1.5rem;
}

h3 {
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  font-weight: 300;
  margin-bottom: 1rem;
}

p {
  font-weight: 300;
  line-height: 1.8;
  margin-bottom: 1rem;
}

/* 网格系统 */
.grid {
  display: grid;
  gap: 2rem;
}

.grid-cols-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-cols-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-cols-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* 瀑布流 */
.masonry {
  columns: 4;
  column-gap: 2rem;
}

.masonry-item {
  break-inside: avoid;
  margin-bottom: 2rem;
}

/* 响应式 */
@media (max-width: 1024px) {
  .masonry {
    columns: 3;
  }
  
  .grid-cols-4 {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .nav-links {
    gap: 1.5rem;
    font-size: 0.9rem;
  }
  
  .container {
    padding: 5rem 1rem 1rem;
  }
  
  .masonry {
    columns: 2;
    column-gap: 1rem;
  }
  
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .nav-links {
    gap: 1rem;
    font-size: 0.85rem;
  }
  
  .masonry {
    columns: 1;
  }
  
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr;
  }
}

/* 动画 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 6px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--oatmeal);
}

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