/* 全局样式配置 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

:root {
  --color-base: #F5F5F0;
  --color-muted: #E8E8E0;
  --color-gray: #9E9E8C;
  --color-text: #2C2C2C;
  --color-accent-blue: #A8B8C8;
  --color-accent-pink: #D4B5A0;
  --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-subtle: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.08);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--color-base);
  color: var(--color-text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 图片懒加载与优化 */
img {
  max-width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
}

img[loading="lazy"] {
  opacity: 0;
  transition: opacity 0.6s ease-in;
}

img[loading="lazy"].loaded {
  opacity: 1;
}

/* 悬停效果 */
.hover-scale {
  transition: var(--transition-base);
}

.hover-scale:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-hover);
}

.hover-lift {
  transition: var(--transition-base);
}

.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

/* 导航栏样式 */
nav {
  backdrop-filter: blur(10px);
  background-color: rgba(245, 245, 240, 0.95);
  box-shadow: var(--shadow-subtle);
}

nav a {
  position: relative;
  transition: var(--transition-base);
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: var(--color-accent-blue);
  transition: var(--transition-base);
  transform: translateX(-50%);
}

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

/* 轮播图效果 */
.carousel-container {
  position: relative;
  overflow: hidden;
}

.carousel-item {
  transition: opacity 1s ease-in-out;
}

.carousel-item.active {
  opacity: 1;
}

.carousel-item:not(.active) {
  opacity: 0;
  position: absolute;
  top: 0;
  left: 0;
}

/* 网格布局 */
.grid-masonry {
  column-count: 3;
  column-gap: 1.5rem;
}

.grid-masonry > * {
  break-inside: avoid;
  margin-bottom: 1.5rem;
}

@media (max-width: 1024px) {
  .grid-masonry {
    column-count: 2;
  }
}

@media (max-width: 640px) {
  .grid-masonry {
    column-count: 1;
  }
}

/* 模态框 */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  z-index: 9999;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.modal.show {
  display: flex;
  opacity: 1;
  justify-content: center;
  align-items: center;
}

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

/* 文字效果 */
.text-gradient {
  background: linear-gradient(135deg, var(--color-accent-blue), var(--color-accent-pink));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 加载动画 */
.loading-skeleton {
  background: linear-gradient(90deg, var(--color-muted) 25%, var(--color-base) 50%, var(--color-muted) 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-muted);
}

::-webkit-scrollbar-thumb {
  background: var(--color-gray);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text);
}

/* 按钮样式 */
.btn-primary {
  background-color: var(--color-text);
  color: var(--color-base);
  padding: 0.75rem 2rem;
  border-radius: 0.25rem;
  transition: var(--transition-base);
  border: none;
  cursor: pointer;
  font-weight: 500;
}

.btn-primary:hover {
  background-color: var(--color-gray);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

/* 响应式间距 */
.section-padding {
  padding: 4rem 1.5rem;
}

@media (min-width: 768px) {
  .section-padding {
    padding: 6rem 2rem;
  }
}

@media (min-width: 1024px) {
  .section-padding {
    padding: 8rem 3rem;
  }
}

/* 平滑滚动动画 */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 时间轴样式 */
.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-accent-blue), var(--color-accent-pink));
}

.timeline-item {
  position: relative;
  margin-bottom: 3rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.5rem;
  top: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--color-accent-blue);
  border: 2px solid var(--color-base);
}

/* 卡片样式 */
.card {
  background-color: #FFFFFF;
  border-radius: 0.5rem;
  overflow: hidden;
  box-shadow: var(--shadow-subtle);
  transition: var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-hover);
}

/* 优化移动端体验 */
@media (max-width: 768px) {
  body {
    font-size: 14px;
  }

  .section-padding {
    padding: 3rem 1rem;
  }

  .timeline {
    padding-left: 1.5rem;
  }

  .timeline-item::before {
    left: -2rem;
  }
}