/* ============================================
   夜猫996 技术博客 - 主样式文件
   科技蓝暗色主题
   ============================================ */

/* === CSS Variables === */
:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: #151c2e;
  --bg-card-hover: #1a2340;
  --color-primary: #3b82f6;
  --color-secondary: #06b6d4;
  --color-accent: #22d3ee;
  --color-text: #e2e8f0;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-border: #1e293b;
  --color-border-hover: #334155;
  --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.15);
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --container-width: 1200px;
}

/* === Reset & Base === */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--color-text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent);
}

ul, ol {
  list-style: none;
}

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

.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* === 导航栏 === */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(10, 14, 26, 0.95);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.4);
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.nav-logo:hover {
  color: var(--color-primary);
}

.nav-logo .logo-icon {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--color-primary);
  background: rgba(59, 130, 246, 0.1);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  position: relative;
  transition: all var(--transition-fast);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 16px;
  right: 16px;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-normal);
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
  transform: scaleX(1);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.search-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.search-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(59, 130, 246, 0.05);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-btn span {
  display: block;
  height: 2px;
  background: var(--color-text-secondary);
  border-radius: 1px;
  transition: all var(--transition-fast);
}

/* 搜索覆盖层 */
.search-overlay {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: rgba(10, 14, 26, 0.98);
  border-bottom: 1px solid var(--color-border);
  padding: 16px 0;
}

.search-overlay.active {
  display: block;
  animation: slideDown 0.2s ease;
}

.search-container {
  max-width: 600px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.search-input {
  flex: 1;
  background: var(--bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  color: var(--color-text);
  font-size: 1rem;
  font-family: var(--font-sans);
  outline: none;
  transition: border-color var(--transition-fast);
}

.search-input:focus {
  border-color: var(--color-primary);
}

.search-input::placeholder {
  color: var(--color-text-muted);
}

.search-close {
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.search-close:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--color-text);
}

/* === Hero 区域 === */
.hero {
  position: relative;
  padding: 120px 0 80px;
  overflow: hidden;
  min-height: 580px;
  display: flex;
  align-items: center;
}

.hero-bg-grid {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-greeting {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--color-secondary);
  margin-bottom: 12px;
}

.cursor {
  animation: blink 1s infinite;
  color: var(--color-primary);
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

.hero-title {
  font-size: 2.8rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-title .highlight {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  margin-bottom: 24px;
  line-height: 1.8;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
}

.hero-tags .tag {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 4px 12px;
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  transition: all var(--transition-fast);
}

.hero-tags .tag:hover {
  background: rgba(59, 130, 246, 0.15);
  border-color: var(--color-primary);
  box-shadow: 0 0 12px rgba(59, 130, 246, 0.2);
}

.hero-stats {
  display: flex;
  gap: 40px;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* 代码窗口 */
.hero-visual {
  display: flex;
  justify-content: center;
}

.code-window {
  width: 100%;
  max-width: 420px;
  background: var(--bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.code-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid var(--color-border);
}

.code-header .dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.code-header .dot.red { background: #ff5f57; }
.code-header .dot.yellow { background: #febc2e; }
.code-header .dot.green { background: #28c840; }

.code-title {
  margin-left: 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.code-body {
  padding: 20px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.8;
  overflow-x: auto;
  border-left: 3px solid var(--color-primary);
}

.code-keyword { color: #c678dd; }
.code-var { color: #e06c75; }
.code-key { color: #61afef; }
.code-string { color: #98c379; }
.code-number { color: #d19a66; }

/* === 主内容区 === */
.main-content {
  padding: 60px 0;
}

.content-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 40px;
  align-items: start;
}

/* === 文章区域 === */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
  flex-wrap: wrap;
  gap: 16px;
}

.section-header.center {
  flex-direction: column;
  text-align: center;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}

.title-icon {
  color: var(--color-primary);
  font-size: 0.8em;
}

.section-desc {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-top: 8px;
  max-width: 500px;
}

.filter-tabs {
  display: flex;
  gap: 4px;
  background: var(--bg-secondary);
  padding: 4px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.filter-btn {
  padding: 6px 16px;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  font-size: 0.85rem;
  font-family: var(--font-sans);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  color: var(--color-text);
}

.filter-btn.active {
  background: var(--color-primary);
  color: #fff;
}

/* 文章卡片 */
.articles-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.article-card {
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.article-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.article-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-border-hover);
  box-shadow: var(--shadow-card), 0 0 30px rgba(59, 130, 246, 0.08);
}

.article-card:hover::before {
  opacity: 1;
}

.article-meta-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.article-category {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
}

.article-category.php {
  background: rgba(139, 92, 246, 0.1);
  color: #a78bfa;
  border: 1px solid rgba(139, 92, 246, 0.2);
}

.article-category.java {
  background: rgba(239, 68, 68, 0.1);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.article-category.frontend {
  background: rgba(34, 211, 238, 0.1);
  color: #22d3ee;
  border: 1px solid rgba(34, 211, 238, 0.2);
}

.article-category.devops {
  background: rgba(34, 197, 94, 0.1);
  color: #4ade80;
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.article-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.article-title {
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 12px;
}

.article-title a {
  color: var(--color-text);
  transition: color var(--transition-fast);
}

.article-title a:hover {
  color: var(--color-primary);
}

.article-excerpt {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.8;
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.article-tag {
  font-size: 0.75rem;
  padding: 2px 8px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

.article-tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.article-stats {
  display: flex;
  gap: 16px;
}

.article-stats .stat {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  font-family: var(--font-mono);
}

.article-stats .stat svg {
  opacity: 0.6;
}

/* 加载更多 */
.load-more {
  display: flex;
  justify-content: center;
  margin-top: 40px;
}

.load-more-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 32px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.load-more-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(59, 130, 246, 0.05);
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.1);
}

/* === 侧边栏 === */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
  position: sticky;
  top: 88px;
}

.sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: border-color var(--transition-normal);
}

.sidebar-card:hover {
  border-color: var(--color-border-hover);
}

.sidebar-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.title-dot {
  width: 8px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 2px;
}

/* 关于我卡片 */
.about-card {
  text-align: center;
}

.about-avatar {
  position: relative;
  display: inline-block;
  margin-bottom: 16px;
}

.avatar-placeholder {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  font-family: var(--font-mono);
}

.avatar-status {
  position: absolute;
  bottom: 4px;
  right: 4px;
  width: 14px;
  height: 14px;
  background: #22c55e;
  border: 2px solid var(--bg-card);
  border-radius: 50%;
}

.about-name {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.about-title {
  font-size: 0.85rem;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.about-bio {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.about-links {
  display: flex;
  justify-content: center;
  gap: 12px;
}

.about-link {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.about-link:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(59, 130, 246, 0.05);
}

/* 分类列表 */
.category-list li {
  border-bottom: 1px solid var(--color-border);
}

.category-list li:last-child {
  border-bottom: none;
}

.category-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.category-list a:hover {
  color: var(--color-primary);
  padding-left: 8px;
}

.cat-count {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  background: rgba(255, 255, 255, 0.03);
  padding: 2px 8px;
  border-radius: 10px;
}

/* 标签云 */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.cloud-tag {
  font-size: 0.8rem;
  padding: 4px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.cloud-tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(59, 130, 246, 0.05);
}

.cloud-tag.hot {
  border-color: rgba(59, 130, 246, 0.3);
  color: var(--color-primary);
  background: rgba(59, 130, 246, 0.08);
}

/* 热门文章 */
.hot-articles li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
}

.hot-articles li:last-child {
  border-bottom: none;
}

.hot-rank {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  font-family: var(--font-mono);
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
}

.hot-rank.top {
  background: rgba(59, 130, 246, 0.15);
  color: var(--color-primary);
}

.hot-articles a {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.hot-articles a:hover {
  color: var(--color-primary);
}

/* === 项目展示区 === */
.projects-section {
  padding: 80px 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 40px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition-normal);
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: rgba(59, 130, 246, 0.3);
  box-shadow: var(--shadow-card), 0 0 30px rgba(59, 130, 246, 0.1);
}

.project-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.15);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  margin-bottom: 16px;
}

.project-name {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.project-desc {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.project-tech span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 2px 8px;
  background: rgba(59, 130, 246, 0.06);
  border: 1px solid rgba(59, 130, 246, 0.15);
  border-radius: var(--radius-sm);
  color: var(--color-secondary);
}

/* === Footer === */
.footer {
  padding: 60px 0 30px;
  background: var(--bg-primary);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 60px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-border);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
}

.footer-logo .logo-icon {
  font-family: var(--font-mono);
  color: var(--color-primary);
  background: rgba(59, 130, 246, 0.1);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.footer-desc {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  font-style: italic;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.footer-col h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--color-text);
}

.footer-col a {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  padding: 4px 0;
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.footer-powered {
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

/* === 回到顶部 === */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-normal);
  z-index: 100;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.15);
}

/* === 动画 === */
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

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

.fade-in-up {
  animation: fadeInUp 0.5s ease forwards;
}

/* === 响应式 === */
@media (max-width: 1024px) {
  .content-grid {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

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

  .hero-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-visual {
    display: none;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 14, 26, 0.98);
    border-bottom: 1px solid var(--color-border);
    padding: 16px;
  }

  .nav-links.active {
    display: flex;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .hero {
    padding: 100px 0 60px;
    min-height: auto;
  }

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

  .hero-stats {
    gap: 24px;
  }

  .stat-number {
    font-size: 1.5rem;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .filter-tabs {
    overflow-x: auto;
    width: 100%;
  }

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

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

  .footer-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .footer-links {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .article-card {
    padding: 20px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.6rem;
  }

  .hero-tags {
    gap: 6px;
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: 16px;
  }

  .footer-links {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
}