/* 全局样式文件 - 极简现代主义设计、响应式布局、动画效果 */

/* 重置样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* 字体引入 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@300;400;600&family=Noto+Sans+SC:wght@300;400;500&display=swap');

/* 根元素变量 */
:root {
  --color-bg: #faf9f7;
  --color-bg-secondary: #f5f4f2;
  --color-text: #2c2c2c;
  --color-text-light: #6b6b6b;
  --color-accent: #e8e6e3;
  --color-overlay: rgba(0, 0, 0, 0.6);
  --font-serif: 'Noto Serif SC', serif;
  --font-sans: 'Noto Sans SC', sans-serif;
  --transition-fast: 0.3s ease;
  --transition-smooth: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-subtle: 0 4px 24px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.12);
}

/* 基础样式 */
html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
  overflow-x: hidden;
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 5%;
  background: rgba(250, 249, 247, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--color-accent);
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--color-text);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 3rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.95rem;
  color: var(--color-text-light);
  text-decoration: none;
  transition: color var(--transition-fast);
  letter-spacing: 1px;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-text);
}

/* 页脚 */
.footer {
  text-align: center;
  padding: 3rem 5%;
  border-top: 1px solid var(--color-accent);
  margin-top: 5rem;
}

.footer-line {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 0.5rem;
  letter-spacing: 1px;
}

/* 容器 */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 5%;
}

/* 全屏轮播 */
.hero-slider {
  position: relative;
  height: 100vh;
  overflow: hidden;
  margin-top: 72px;
}

.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1s ease;
}

.slide.active {
  opacity: 1;
}

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

.slide-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to bottom, transparent 40%, rgba(0,0,0,0.3));
  display: flex;
  align-items: center;
  justify-content: center;
}

.slide-text {
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 300;
  color: white;
  letter-spacing: 4px;
  text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-10px); }
}

/* 章节标题 */
.section {
  padding: 5rem 0;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 400;
  text-align: center;
  margin-bottom: 3rem;
  letter-spacing: 3px;
  color: var(--color-text);
}

/* 网格布局 */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

/* 图片卡片 */
.image-card {
  position: relative;
  overflow: hidden;
  border-radius: 4px;
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.image-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-smooth);
}

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

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

.image-card-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1.5rem;
  background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
  color: white;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.image-card:hover .image-card-overlay {
  opacity: 1;
}

.image-card-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  letter-spacing: 1px;
}

.image-card-desc {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.9);
  line-height: 1.6;
}

/* 哲学版块 */
.philosophy-section {
  position: relative;
  padding: 8rem 5%;
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
}

.philosophy-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(250, 249, 247, 0.92);
  backdrop-filter: blur(5px);
}

.philosophy-content {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.philosophy-title {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  margin-bottom: 2rem;
  letter-spacing: 2px;
}

.philosophy-text {
  font-size: 1.1rem;
  line-height: 2;
  color: var(--color-text-light);
  letter-spacing: 0.5px;
}

/* 横向滚动区域 */
.scroll-container {
  overflow-x: auto;
  overflow-y: hidden;
  white-space: nowrap;
  padding: 2rem 0;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.scroll-container::-webkit-scrollbar {
  height: 6px;
}

.scroll-container::-webkit-scrollbar-track {
  background: var(--color-accent);
}

.scroll-container::-webkit-scrollbar-thumb {
  background: var(--color-text-light);
  border-radius: 3px;
}

.scroll-item {
  display: inline-block;
  width: 400px;
  margin-right: 2rem;
  vertical-align: top;
  white-space: normal;
}

.scroll-item img {
  width: 100%;
  height: 500px;
  object-fit: cover;
  border-radius: 4px;
}

/* 瀑布流 */
.masonry {
  column-count: 3;
  column-gap: 2rem;
}

.masonry-item {
  break-inside: avoid;
  margin-bottom: 2rem;
}

.masonry-item img {
  width: 100%;
  border-radius: 4px;
  transition: transform var(--transition-fast);
  cursor: pointer;
}

.masonry-item:hover img {
  transform: scale(1.02);
  box-shadow: var(--shadow-hover);
}

/* 筛选分类 */
.filter-tabs {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.filter-tab {
  font-size: 1rem;
  padding: 0.75rem 1.5rem;
  border: 1px solid var(--color-accent);
  background: transparent;
  color: var(--color-text-light);
  cursor: pointer;
  transition: all var(--transition-fast);
  letter-spacing: 1px;
  border-radius: 2px;
}

.filter-tab:hover,
.filter-tab.active {
  background: var(--color-text);
  color: white;
  border-color: var(--color-text);
}

/* 文章内容 */
.article {
  max-width: 900px;
  margin: 0 auto 5rem;
  padding: 3rem;
  background: white;
  border-radius: 4px;
  box-shadow: var(--shadow-subtle);
}

.article-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  margin-bottom: 1.5rem;
  letter-spacing: 2px;
}

.article-content {
  font-size: 1.05rem;
  line-height: 2;
  color: var(--color-text-light);
}

.article-content p {
  margin-bottom: 1.5rem;
}

.article-image {
  width: 100%;
  margin: 2rem 0;
  border-radius: 4px;
}

/* 时间轴 */
.timeline {
  position: relative;
  max-width: 1000px;
  margin: 0 auto;
  padding-left: 50px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-accent);
}

.timeline-item {
  position: relative;
  margin-bottom: 4rem;
}

.timeline-dot {
  position: absolute;
  left: -36px;
  width: 12px;
  height: 12px;
  background: var(--color-text);
  border-radius: 50%;
  border: 3px solid var(--color-bg);
}

.timeline-content {
  padding-left: 2rem;
}

.timeline-year {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  margin-bottom: 1rem;
  letter-spacing: 2px;
}

.timeline-text {
  color: var(--color-text-light);
  line-height: 1.8;
}

/* 响应式设计 */
@media (max-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .masonry { column-count: 2; }
  .scroll-item { width: 320px; }
}

@media (max-width: 768px) {
  .navbar { padding: 1rem 3%; }
  .nav-links { gap: 1.5rem; font-size: 0.875rem; }
  .slide-text { font-size: 2rem; }
  .section-title { font-size: 1.8rem; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .masonry { column-count: 1; }
  .philosophy-section { padding: 5rem 3%; }
  .philosophy-title { font-size: 1.6rem; }
  .scroll-item { width: 280px; }
  .article { padding: 2rem; }
  .timeline { padding-left: 30px; }
  .timeline::before { left: 10px; }
  .timeline-dot { left: -26px; }
}

/* 页面切换动画 */
.page-transition {
  animation: fadeIn var(--transition-smooth);
}

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

/* 滚动触发动画 */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all var(--transition-smooth);
}

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