/* 全局样式配置 */
:root {
  --color-primary: #f5f3f0;
  --color-secondary: #e8e4df;
  --color-accent-blue: #a8b5c7;
  --color-accent-pink: #d4a5a0;
  --color-accent-green: #8b9a8d;
  --color-text-dark: #2c2c2c;
  --color-text-light: #666666;
  --color-bg-light: #fafaf8;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 4rem;
  --font-serif: 'Noto Serif SC', serif;
  --font-sans: 'Noto Sans SC', sans-serif;
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-subtle: 0 2px 12px rgba(0, 0, 0, 0.06);
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--color-text-dark);
  background-color: var(--color-bg-light);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.3;
  margin-bottom: var(--spacing-sm);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }

p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-light);
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition-smooth);
}

/* 导航栏样式 */
.nav-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(250, 250, 248, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--color-secondary);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-sm) var(--spacing-md);
  display: flex;
  justify-content: center;
  align-items: center;
}

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

.nav-menu a {
  font-size: 1rem;
  letter-spacing: 0.05em;
  position: relative;
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 50%;
  width: 0;
  height: 1px;
  background: var(--color-text-dark);
  transition: var(--transition-smooth);
  transform: translateX(-50%);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
  width: 100%;
}

/* 轮播图样式 */
.slider-section {
  position: relative;
  height: 100vh;
  overflow: hidden;
  margin-top: 60px;
}

.slider-container {
  position: relative;
  width: 100%;
  height: 100%;
}

.slide {
  position: absolute;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1s ease-in-out;
}

.slide.active {
  opacity: 1;
}

.slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.slide-caption {
  position: absolute;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
  color: white;
  font-family: var(--font-serif);
  font-size: 1.8rem;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
  letter-spacing: 0.1em;
}

/* 网格布局 */
.featured-section,
.gallery-section {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  font-size: 2rem;
  letter-spacing: 0.05em;
}

.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

.grid-item {
  position: relative;
  overflow: hidden;
  background: white;
  box-shadow: var(--shadow-subtle);
  transition: var(--transition-smooth);
}

.grid-item:hover {
  transform: translateY(-8px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.grid-item img {
  width: 100%;
  height: 450px;
  object-fit: cover;
  transition: var(--transition-smooth);
}

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

.item-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
  padding: var(--spacing-md);
  transform: translateY(100%);
  transition: var(--transition-smooth);
}

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

.item-overlay p {
  color: white;
  font-size: 0.9rem;
  margin: 0;
}

/* 文字内容区域 */
.content-section {
  max-width: 900px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
  text-align: center;
}

.content-section p {
  font-size: 1.1rem;
  line-height: 2;
  text-align: justify;
  text-justify: inter-ideograph;
}

/* 左右布局 */
.split-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
  align-items: center;
}

.split-layout img {
  width: 100%;
  height: 600px;
  object-fit: cover;
  box-shadow: var(--shadow-subtle);
}

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

.split-text h2 {
  margin-bottom: var(--spacing-md);
}

.split-text p {
  text-align: justify;
  text-justify: inter-ideograph;
}

/* 页脚样式 */
.site-footer {
  text-align: center;
  padding: var(--spacing-md);
  background: var(--color-secondary);
  color: var(--color-text-light);
  font-size: 0.9rem;
  margin-top: var(--spacing-xl);
}

/* 返回顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-md);
  right: var(--spacing-md);
  width: 50px;
  height: 50px;
  background: var(--color-text-dark);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-smooth);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--color-accent-blue);
  transform: translateY(-4px);
}

/* 响应式设计 */
@media (max-width: 1024px) {
  .split-layout {
    grid-template-columns: 1fr;
  }
  
  .grid-container {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }
  
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
}

@media (max-width: 768px) {
  .nav-menu {
    gap: var(--spacing-md);
  }
  
  .slider-section {
    height: 70vh;
  }
  
  .slide-caption {
    font-size: 1.2rem;
  }
  
  .grid-container {
    grid-template-columns: 1fr;
  }
  
  .content-section p {
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  :root {
    font-size: 14px;
  }
  
  .nav-menu {
    gap: var(--spacing-sm);
    font-size: 0.9rem;
  }
  
  .slider-section {
    height: 60vh;
  }
}

/* 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;
}

/* 图片懒加载占位 */
img[loading="lazy"] {
  background: var(--color-secondary);
}