/* 全局样式定义 - 围巾艺术展示网站 */
:root {
  /* 设计令牌 */
  --color-primary: #f5f5f0;
  --color-secondary: #fafaf8;
  --color-accent: #8b7355;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-border: #e0e0e0;
  
  /* 间距 */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 4rem;
  
  /* 字体 */
  --font-family: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 3rem;
  
  /* 圆角 */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  
  /* 阴影 */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
}

/* 全局重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text);
  line-height: 1.6;
  background-color: var(--color-primary);
}

/* 通用容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

/* 导航样式 */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

.navbar-content {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-sm) 0;
}

.nav-menu {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.nav-link {
  color: var(--color-text);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.nav-link:hover {
  color: var(--color-accent);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width 0.3s ease;
}

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

/* 主要内容区域 */
main {
  margin-top: 80px;
  min-height: calc(100vh - 140px);
}

/* 按钮样式 */
.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-accent);
  background-color: transparent;
  color: var(--color-accent);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: all 0.3s ease;
  cursor: pointer;
  font-weight: 500;
}

.btn:hover {
  background-color: var(--color-accent);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* 图片容器 */
.image-container {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
}

.image-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

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

/* 页脚样式 */
footer {
  background-color: var(--color-secondary);
  padding: var(--spacing-md) 0;
  text-align: center;
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .nav-menu {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .container {
    padding: 0 var(--spacing-xs);
  }
  
  main {
    margin-top: 120px;
  }
}

/* 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;
}

/* 灯箱样式 */
.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.lightbox.active {
  opacity: 1;
  visibility: visible;
}

.lightbox-close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  color: white;
  font-size: var(--font-size-2xl);
  cursor: pointer;
  transition: transform 0.3s ease;
}

.lightbox-close:hover {
  transform: rotate(90deg);
}

.lightbox img {
  max-width: 90%;
  max-height: 90%;
  object-fit: contain;
}