/* 
 * 全局样式设计 - 时尚男装展示平台
 * 视觉风格：极简、现代、专业
 * 核心技术：CSS Variables, Grid, Flexbox
 */

:root {
  /* 调色板 */
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fa;
  --color-text-main: #1a1a1a;
  --color-text-sub: #555555;
  --color-text-light: #999999;
  --color-accent: #1B2631; /* 深蓝 */
  --color-accent-red: #800020; /* 勃艮第红点缀 */
  --color-accent-green: #2F4F4F; /* 墨绿点缀 */
  --color-border: #e5e5e5;
  
  /* 字体系统 */
  --font-main: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
  
  /* 间距系统 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 8rem;

  /* 布局 */
  --container-width: 1440px;
  --nav-height: 80px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background-color: var(--color-bg);
  color: var(--color-text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s ease;
}

img {
  max-width: 100%;
  display: block;
  height: auto;
}

ul {
  list-style: none;
}

/* 布局工具类 */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.grid {
  display: grid;
  gap: var(--spacing-md);
}

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
}

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

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 var(--spacing-md);
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: all 0.3s ease;
}

.nav-links {
  display: flex;
  gap: var(--spacing-md);
}

.nav-link {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 500;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-text-main);
  transition: width 0.3s ease;
}

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

.brand {
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: 2px;
  opacity: 0; /* 极简风格，不显示Logo文字，或根据需求调整 */
}

/* 首页 Hero */
.hero {
  height: 100vh;
  width: 100%;
  position: relative;
  overflow: hidden;
}

.hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1s ease-in-out;
  background-size: cover;
  background-position: center;
}

.hero-slide.active {
  opacity: 1;
}

.hero-content {
  position: absolute;
  bottom: var(--spacing-xl);
  left: var(--spacing-md);
  color: #fff;
  z-index: 10;
  text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.hero-title {
  font-size: 3rem;
  font-weight: 300;
  margin-bottom: var(--spacing-sm);
  letter-spacing: 2px;
}

.hero-btn {
  display: inline-block;
  padding: 12px 24px;
  border: 1px solid #fff;
  color: #fff;
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 2px;
  margin-top: var(--spacing-md);
}

.hero-btn:hover {
  background: #fff;
  color: var(--color-text-main);
}

/* 分类卡片 */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-sm);
}

.category-card {
  position: relative;
  aspect-ratio: 4/5;
  overflow: hidden;
  cursor: pointer;
}

.category-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

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

.category-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s;
}

.category-card:hover .category-overlay {
  background: rgba(0,0,0,0.2);
}

.category-title {
  color: #fff;
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: 3px;
  text-transform: uppercase;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s;
}

.category-card:hover .category-title {
  border-bottom-color: #fff;
}

/* 瀑布流/网格 (Collections) */
.filter-bar {
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--spacing-md);
  display: flex;
  gap: var(--spacing-md);
  overflow-x: auto;
}

.filter-btn {
  background: none;
  border: none;
  font-family: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  color: var(--color-text-sub);
  padding: 5px 0;
}

.filter-btn.active, .filter-btn:hover {
  color: var(--color-text-main);
  font-weight: 500;
}

.masonry-grid {
  column-count: 3;
  column-gap: var(--spacing-md);
}

.collection-item {
  break-inside: avoid;
  margin-bottom: var(--spacing-md);
  position: relative;
  background: var(--color-bg-alt);
}

.item-img {
  width: 100%;
  display: block;
}

.item-info {
  padding: var(--spacing-sm) 0;
}

.item-desc {
  font-size: 0.85rem;
  color: var(--color-text-sub);
}

/* 风格指南 (Style Guide) */
.style-section {
  margin-bottom: var(--spacing-xl);
}

.color-palette {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-sm);
}

.color-swatch {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  position: relative;
}

.color-swatch::after {
  content: attr(data-name);
  position: absolute;
  bottom: -25px;
  width: 100%;
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-text-sub);
}

.fabric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

.fabric-card img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  margin-bottom: var(--spacing-sm);
}

/* 视觉故事 (Visual Stories) */
.story-block {
  margin-bottom: var(--spacing-xl);
}

.story-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.story-header h2 {
  font-size: 2rem;
  font-weight: 300;
  margin-bottom: var(--spacing-sm);
}

.story-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: var(--spacing-lg);
  align-items: center;
}

.story-grid.reverse {
  grid-template-columns: 1fr 1.5fr;
}

.story-grid.reverse .story-img {
  order: 2;
}

.story-text {
  padding: var(--spacing-md);
}

/* 关于理念 (Philosophy) */
.philosophy-text {
  max-width: 800px;
  margin: 0 auto;
  font-size: 1.1rem;
  text-align: justify;
}

.quote-block {
  border-left: 2px solid var(--color-accent);
  padding-left: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  font-style: italic;
  font-size: 1.25rem;
  color: var(--color-text-sub);
}

/* 页脚 */
.footer {
  padding: var(--spacing-lg) 0;
  text-align: center;
  border-top: 1px solid var(--color-border);
  margin-top: var(--spacing-xl);
}

.copyright {
  font-size: 0.8rem;
  color: var(--color-text-light);
  letter-spacing: 2px;
}

/* 响应式设计 */
@media (max-width: 1024px) {
  .masonry-grid {
    column-count: 2;
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-xl: 4rem;
    --nav-height: 60px;
  }

  .navbar {
    padding: 0 var(--spacing-sm);
  }

  .nav-links {
    gap: var(--spacing-sm);
    font-size: 0.75rem;
  }
  
  .nav-link {
    font-size: 0.75rem;
  }

  .hero-title {
    font-size: 2rem;
  }

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

  .story-grid, .story-grid.reverse {
    grid-template-columns: 1fr;
  }
  
  .story-grid.reverse .story-img {
    order: 0;
  }
  
  .masonry-grid {
    column-count: 1;
  }
}

/* 动画工具 */
.fade-in {
  animation: fadeIn 0.8s ease forwards;
  opacity: 0;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}