/* ---------- 字体栈 (本地优先) ---------- */
/* 移除 Google Fonts，使用系统字体以实现最快加载速度 */

/* ---------- CSS 变量 ---------- */
:root {
  /* 字体定义 */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';
  --font-heading: 'Space Grotesk', var(--font-sans);
  /* Space Grotesk 本地没安装会自动回退到 sans */
  --font-cn: 'PingFang SC', 'Microsoft YaHei', 'Heiti SC', var(--font-sans);

  /* 主色调 - 深色优雅 */
  --primary: #6366F1;
  --primary-light: #818CF8;
  --primary-dark: #4F46E5;

  /* 渐变 */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-accent: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-dark: linear-gradient(135deg, #0c0c0c 0%, #1a1a2e 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);

  /* 背景色 */
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-tertiary: #1a1a1a;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.08);

  /* 文字颜色 */
  --text-primary: #ffffff;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;

  /* 边框 */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.15);

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 60px rgba(99, 102, 241, 0.3);

  /* 间距 */
  --section-gap: 120px;
  --container-max: 1400px;
  --container-narrow: 1000px;

  /* 动画 */
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --duration-fast: 200ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;
}

/* ---------- 基础重置 ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-cn);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 背景装饰 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse 80% 50% at 20% -20%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

/* ---------- 工具类 ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 32px;
}

.container-narrow {
  max-width: var(--container-narrow);
}

.section {
  padding: var(--section-gap) 0;
  position: relative;
}

.text-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------- 导航栏 ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: all var(--duration-normal) var(--ease-smooth);
}

.navbar.scrolled {
  background: rgba(10, 10, 10, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 16px 0;
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

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

.nav-links {
  display: flex;
  gap: 40px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color var(--duration-fast) var(--ease-smooth);
  cursor: pointer;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--duration-normal) var(--ease-smooth);
}

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

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  padding: 8px;
  z-index: 1001;
}

.nav-toggle span {
  width: 28px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--duration-fast) var(--ease-smooth);
  border-radius: 2px;
}

/* ---------- Hero 区域 ---------- */
.hero {
  min-height: 80vh;
  /* 稍微减小高度，更紧凑 */
  display: flex;
  align-items: center;
  padding: 160px 0 100px;
  position: relative;
  overflow: hidden;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  width: 100%;
}

.hero-text {
  z-index: 1;
  max-width: 900px;
  /* 限制宽度提高可读性 */
  margin: 0 auto;
}

.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 8px 16px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.hero-label .dot {
  width: 8px;
  height: 8px;
  background: #22c55e;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.5;
  }
}

.hero-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 4.5rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: 1.5rem;
  color: var(--primary-light);
  margin-bottom: 24px;
  font-weight: 500;
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 40px;
  max-width: 500px;
}

.hero-buttons {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin-top: 48px;
}

/* 统计数据 */
.hero-stats {
  display: flex;
  gap: 80px;
  margin-top: 80px;
  padding-top: 0;
  border-top: none;
  justify-content: center;
}

.stat-item {
  position: relative;
}

.stat-item+.stat-item::before {
  content: '';
  position: absolute;
  left: -40px;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 40px;
  background: var(--border-subtle);
}

.stat-item h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 3.5rem;
  /* 增大数字 */
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  background: var(--gradient-primary);
  /* 给数字加渐变 */
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-item span {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 8px;
  display: block;
}

/* ---------- 按钮样式 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 32px;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-smooth);
  border: none;
  font-family: inherit;
}

.btn svg {
  width: 20px;
  height: 20px;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: 0 4px 24px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(99, 102, 241, 0.5);
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-hover);
}

.btn-ghost:hover {
  background: var(--bg-card-hover);
  border-color: var(--text-primary);
}

/* ---------- 关于我 ---------- */
.about {
  background: var(--bg-secondary);
}

.about-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  color: var(--primary);
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.section-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 64px;
  align-items: start;
}

.about-intro p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.9;
  margin-bottom: 20px;
}

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

.about-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--duration-normal) var(--ease-smooth);
  cursor: pointer;
}

.about-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
}

.about-card-icon {
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.about-card-icon svg {
  width: 24px;
  height: 24px;
  color: white;
}

.about-card h4 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.about-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ---------- 技能区域 ---------- */
.skills-header {
  text-align: center;
  margin-bottom: 64px;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.skill-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--duration-normal) var(--ease-smooth);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  height: 100%;
  /* 确保高度填满网格单元 */
  display: flex;
  flex-direction: column;
}

.skill-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  transform: scaleX(0);
  transition: transform var(--duration-normal) var(--ease-smooth);
}

.skill-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
}

.skill-card:hover::before {
  transform: scaleX(1);
}

/* 移除 featured 的跨列，改为统一高亮样式 */
.skill-card.featured {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(139, 92, 246, 0.1));
  border-color: rgba(99, 102, 241, 0.2);
}

.skill-card.featured:hover {
  border-color: rgba(99, 102, 241, 0.4);
}

.skill-icon {
  width: 56px;
  height: 56px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.skill-icon svg {
  width: 28px;
  height: 28px;
  color: white;
}

.skill-card h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.375rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.skill-card>p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 20px;
  flex-grow: 1;
  /* 让描述文字占据剩余空间，底部标签对齐 */
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-tag {
  background: rgba(99, 102, 241, 0.15);
  color: var(--primary-light);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 500;
}

/* ---------- 经历时间线 ---------- */
.experience {
  background: var(--bg-secondary);
}

.experience-header {
  text-align: center;
  margin-bottom: 64px;
}

.timeline {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
}

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

.timeline-item {
  position: relative;
  padding-left: 48px;
  padding-bottom: 48px;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.timeline-marker {
  position: absolute;
  left: -8px;
  top: 4px;
  width: 18px;
  height: 18px;
  background: var(--bg-primary);
  border: 3px solid var(--primary);
  border-radius: 50%;
  z-index: 1;
}

.timeline-item:first-child .timeline-marker {
  background: var(--primary);
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.5);
}

.timeline-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--duration-normal) var(--ease-smooth);
}

.timeline-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateX(8px);
}

.timeline-date {
  display: inline-block;
  background: var(--gradient-primary);
  color: white;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.timeline-card h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.375rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.timeline-card h4 {
  color: var(--primary-light);
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 16px;
}

.timeline-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 16px;
}

.timeline-card ul {
  padding-left: 20px;
}

.timeline-card li {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 8px;
  line-height: 1.6;
}

.timeline-card li::marker {
  color: var(--primary);
}

/* ---------- 项目展示 ---------- */
.projects-header {
  text-align: center;
  margin-bottom: 48px;
}

.projects-filter {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 12px 24px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-smooth);
  font-family: inherit;
}

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

.filter-btn.active {
  background: var(--gradient-primary);
  border-color: transparent;
  color: white;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-smooth);
}

.project-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.project-thumbnail {
  width: 100%;
  height: 200px;
  overflow: hidden;
  position: relative;
}

.project-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-smooth);
}

.project-card:hover .project-thumbnail img {
  transform: scale(1.08);
}

.project-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.7) 100%);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-smooth);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 16px;
}

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

.project-view-btn {
  background: white;
  color: var(--bg-primary);
  padding: 10px 20px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  transform: translateY(20px);
  transition: transform var(--duration-normal) var(--ease-smooth);
}

.project-card:hover .project-view-btn {
  transform: translateY(0);
}

.project-view-btn svg {
  width: 16px;
  height: 16px;
}

.project-info {
  padding: 24px;
}

.project-category {
  display: inline-block;
  background: rgba(99, 102, 241, 0.15);
  color: var(--primary-light);
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.project-info h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
}

.project-info p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---------- 联系区域 ---------- */
.contact {
  background: var(--bg-secondary);
}

.contact-header {
  text-align: center;
  margin-bottom: 64px;
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
  align-items: start;
}

.contact-info h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.contact-info>p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 40px;
}

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: all var(--duration-normal) var(--ease-smooth);
  cursor: pointer;
}

.contact-item:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateX(8px);
}

.contact-icon {
  width: 52px;
  height: 52px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-icon svg {
  width: 24px;
  height: 24px;
  color: white;
}

.contact-item-content h4 {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 4px;
}

.contact-item-content p {
  font-size: 1.05rem;
  font-weight: 500;
}

.contact-form-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 40px;
}

.contact-form-wrapper h3 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 32px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 10px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 16px 20px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color var(--duration-fast) var(--ease-smooth);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

.form-submit {
  width: 100%;
  padding: 18px;
  background: var(--gradient-primary);
  border: none;
  border-radius: var(--radius-md);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-smooth);
  font-family: inherit;
}

.form-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(99, 102, 241, 0.4);
}

/* ---------- 页脚 ---------- */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--border-subtle);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.footer-links {
  display: flex;
  gap: 32px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color var(--duration-fast) var(--ease-smooth);
}

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

/* ---------- 动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s var(--ease-smooth), transform 0.8s var(--ease-smooth);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.8s var(--ease-smooth), transform 0.8s var(--ease-smooth);
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.8s var(--ease-smooth), transform 0.8s var(--ease-smooth);
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Staggered animation delays */
.reveal-delay-1 {
  transition-delay: 0.1s;
}

.reveal-delay-2 {
  transition-delay: 0.2s;
}

.reveal-delay-3 {
  transition-delay: 0.3s;
}

.reveal-delay-4 {
  transition-delay: 0.4s;
}

.reveal-delay-5 {
  transition-delay: 0.5s;
}

.reveal-delay-6 {
  transition-delay: 0.6s;
}

/* ---------- 响应式设计 ---------- */
@media (max-width: 1200px) {
  .hero-content {
    gap: 48px;
  }

  .hero-title {
    font-size: 3.5rem;
  }

  /* Removed .hero-avatar as per instruction */

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

@media (max-width: 992px) {
  :root {
    --section-gap: 80px;
  }

  .hero-title {
    font-size: 3.5rem;
  }



  /* Removed .hero-text order and .hero-image order as per instruction */
  /* Removed .hero-avatar as per instruction */

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero-stats {
    justify-content: center;
  }

  .about-content {
    grid-template-columns: 1fr;
  }

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



  .contact-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 20px;
  }

  .nav-links {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10, 10, 10, 0.98);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 32px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--duration-normal) var(--ease-smooth);
  }

  .nav-links.active {
    opacity: 1;
    visibility: visible;
  }

  .nav-links a {
    font-size: 1.5rem;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.25rem;
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: 24px;
  }

  .section-title {
    font-size: 2.25rem;
  }

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



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

  .timeline::before {
    left: 0;
  }

  .timeline-item {
    padding-left: 32px;
  }

  .timeline-marker {
    left: -8px;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-content {
    flex-direction: column;
    gap: 24px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }

  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }

  .btn {
    width: 100%;
  }

  .stat-item h3 {
    font-size: 2rem;
  }

  .contact-form-wrapper {
    padding: 24px;
  }
}

/* ---------- 减少动画偏好 ---------- */
@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .reveal,
  .reveal-left,
  .reveal-right {
    opacity: 1;
    transform: none;
  }
}