/* 全局样式 - 缄默风尚 */

/* 字体导入 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@100;300;400&display=swap');

/* 设计令牌 */
:root {
  --color-primary: #f5f5f0;      /* 象牙白 */
  --color-secondary: #808080;    /* 水泥灰 */
  --color-accent: #1a1a1a;       /* 哑光黑 */
  --color-text: #333333;         /* 文字颜色 */
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --border-radius: 4px;
  --transition: all 0.3s ease;
}

/* 基础样式 */
* {
  box-sizing: border-box;
}

body {
  font-family: 'Noto Sans SC', 'Helvetica', 'Arial', sans-serif;
  font-weight: 300;
  background-color: var(--color-primary);
  color: var(--color-text);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

/* 导航栏 */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(245, 245, 240, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid rgba(128, 128, 128, 0.1);
}

nav ul {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

nav a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 300;
  transition: var(--transition);
  padding: 0.5rem;
}

nav a:hover,
nav a[aria-current="page"] {
  color: var(--color-accent);
  font-weight: 400;
}

/* 英雄区 */
.hero {
  height: 100vh;
  background: linear-gradient(rgba(0,0,0,0.3), rgba(0,0,0,0.3)), url('https://hpi-hub.tos-cn-beijing.volces.com/static/illustration/ai-9037924_1280.png') no-repeat center/cover;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  color: white;
  position: relative;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 100;
  letter-spacing: 0.2em;
  margin-bottom: var(--spacing-lg);
  text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.scroll-down {
  position: absolute;
  bottom: var(--spacing-md);
  color: white;
  font-size: 2rem;
  text-decoration: none;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(-10px); }
  60% { transform: translateY(-5px); }
}

/* 网格布局 */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  max-width: 1200px;
  margin: 0 auto;
}

.grid-item {
  position: relative;
  overflow: hidden;
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.grid-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

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

/* 分类筛选 */
.filter-buttons {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  flex-wrap: wrap;
}

.filter-btn {
  background: transparent;
  border: 1px solid var(--color-secondary);
  color: var(--color-text);
  padding: 0.5rem 1.5rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  font-family: inherit;
  font-weight: 300;
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--color-accent);
  color: var(--color-primary);
  border-color: var(--color-accent);
}

/* 瀑布流 */
.masonry {
  column-count: 4;
  column-gap: var(--spacing-sm);
  padding: var(--spacing-md);
}

.masonry-item {
  break-inside: avoid;
  margin-bottom: var(--spacing-sm);
}

.masonry-item img {
  width: 100%;
  display: block;
  border-radius: var(--border-radius);
  transition: var(--transition);
}

.masonry-item img:hover {
  transform: scale(1.02);
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

/* 杂志化布局 */
.magazine-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  max-width: 1200px;
  margin: 0 auto;
}

.magazine-section:nth-child(even) {
  direction: rtl;
}

.magazine-section:nth-child(even) > * {
  direction: ltr;
}

.magazine-image {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius);
}

.magazine-content h2 {
  font-weight: 300;
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-accent);
}

.magazine-content p {
  font-weight: 300;
  line-height: 1.8;
  color: #666;
}

/* 关于页面 */
.about-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

.about-image {
  width: 100%;
  border-radius: var(--border-radius);
}

.about-content h1 {
  font-weight: 300;
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-accent);
}

.about-content p {
  font-weight: 300;
  line-height: 1.8;
  font-size: 1.1rem;
}

/* 页脚 */
footer {
  text-align: center;
  padding: var(--spacing-md);
  border-top: 1px solid rgba(128, 128, 128, 0.2);
  margin-top: var(--spacing-lg);
}

footer p {
  font-weight: 300;
  color: var(--color-secondary);
  font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
  nav ul {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .hero h1 {
    letter-spacing: 0.1em;
  }
  
  .masonry {
    column-count: 2;
  }
  
  .magazine-section,
  .about-container {
    grid-template-columns: 1fr;
  }
  
  .grid {
    grid-template-columns: 1fr;
    padding: var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  .masonry {
    column-count: 1;
  }
  
  .filter-buttons {
    padding: var(--spacing-sm);
  }
  
  .filter-btn {
    padding: 0.3rem 1rem;
    font-size: 0.9rem;
  }
}

/* 动画效果 */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeIn 0.8s ease forwards;
}

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