/* 基础重置和变量 */
:root {
  /* 颜色系统 */
  --color-primary: #6366f1;
  --color-primary-dark: #4f46e5;
  --color-primary-light: #818cf8;
  --color-secondary: #10b981;
  --color-accent: #f59e0b;
  
  /* 背景色 */
  --color-bg-primary: #0a0a0b;
  --color-bg-secondary: #111111;
  --color-bg-tertiary: #1a1a1b;
  --color-bg-card: #161617;
  --color-bg-hover: #1f1f20;
  
  /* 文字色 */
  --color-text-primary: #ffffff;
  --color-text-secondary: #a1a1aa;
  --color-text-tertiary: #71717a;
  
  /* 边框色 */
  --color-border: #27272a;
  --color-border-light: #3f3f46;
  
  /* 阴影 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
  
  /* 字体 */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  
  /* 过渡 */
  --transition-fast: 0.15s ease-out;
  --transition-normal: 0.3s ease-out;
  --transition-slow: 0.5s ease-out;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(10, 10, 11, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(10, 10, 11, 0.95);
  box-shadow: var(--shadow-lg);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 70px;
}

.nav-logo {
  display: flex;
  align-items: center;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
  text-decoration: none;
}

.nav-logo i {
  color: var(--color-primary);
  margin-right: 0.5rem;
  font-size: 1.8rem;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition-fast);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: var(--transition-fast);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  cursor: pointer;
}

.nav-toggle .bar {
  width: 25px;
  height: 3px;
  background: var(--color-text-primary);
  margin: 3px 0;
  transition: var(--transition-fast);
}

/* Hero区域 */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
  overflow: hidden;
}

.hero-greeting {
  margin-bottom: 2rem;
  opacity: 0.8;
}

.greeting-text {
  color: var(--color-text-secondary);
  font-size: 1.1rem;
  font-weight: 400;
}

.hero-intro {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-bottom: 2rem;
}

.hero-avatar {
  flex-shrink: 0;
}

.avatar-image {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: white;
  box-shadow: 
    0 0 0 4px rgba(99, 102, 241, 0.1),
    0 8px 32px rgba(0, 0, 0, 0.3);
  position: relative;
  transition: var(--transition-normal);
}

.avatar-image::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  z-index: -1;
  opacity: 0.3;
  animation: avatarGlow 3s ease-in-out infinite alternate;
}

.avatar-photo {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center;
}

@keyframes avatarGlow {
  0% {
    transform: scale(1);
    opacity: 0.3;
  }
  100% {
    transform: scale(1.05);
    opacity: 0.1;
  }
}

.hero-title-section {
  flex: 1;
}

.hero-highlights {
  margin: 2rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

.highlight-item i {
  color: var(--color-primary);
  width: 20px;
  text-align: center;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.1) 0%, transparent 50%);
  pointer-events: none;
}

.hero-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  animation: fadeInUp 1s ease-out;
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 1.5rem;
}

.gradient-text {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: block;
}

.hero-subtitle {
  color: var(--color-text-secondary);
  font-size: 2rem;
  font-weight: 400;
  display: block;
  margin-top: 0.5rem;
}

.hero-description {
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: var(--transition-normal);
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
  box-shadow: var(--shadow-md);
}

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

.btn-secondary {
  background: transparent;
  color: var(--color-text-primary);
  border: 2px solid var(--color-border-light);
}

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

/* Hero视觉效果 */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  animation: fadeInRight 1s ease-out 0.3s both;
}

.neural-network {
  position: relative;
  width: 400px;
  height: 400px;
}

.node {
  position: absolute;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.3);
  animation: pulse 2s ease-in-out infinite;
}

.node:nth-child(1) { top: 50px; left: 50px; animation-delay: 0s; }
.node:nth-child(2) { top: 50px; right: 50px; animation-delay: 0.2s; }
.node:nth-child(3) { bottom: 150px; left: 170px; animation-delay: 0.4s; }
.node:nth-child(4) { bottom: 50px; left: 50px; animation-delay: 0.6s; }
.node:nth-child(5) { bottom: 50px; right: 50px; animation-delay: 0.8s; }

.connection {
  position: absolute;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), transparent);
  animation: flow 3s ease-in-out infinite;
}

.connection:nth-child(6) {
  top: 80px;
  left: 110px;
  width: 180px;
  transform: rotate(0deg);
}

.connection:nth-child(7) {
  top: 150px;
  left: 80px;
  width: 120px;
  transform: rotate(45deg);
}

.connection:nth-child(8) {
  top: 150px;
  right: 80px;
  width: 120px;
  transform: rotate(-45deg);
}

.connection:nth-child(9) {
  bottom: 80px;
  left: 110px;
  width: 180px;
  transform: rotate(0deg);
}

/* 通用区域样式 */
section {
  padding: 5rem 0;
}

.section-header {
  text-align: center;
  margin-bottom: 4rem;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--color-text-primary), var(--color-text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* MDFriday品牌展示 */
.mdfriday-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.mdfriday-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  transition: var(--transition-normal);
  box-shadow: var(--shadow-md);
}

.mdfriday-logo:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.logo-image {
  height: 90px;
  width: auto;
  max-width: 200px;
  object-fit: contain;
  filter: brightness(1.1);
  transition: var(--transition-normal);
}

.mdfriday-logo:hover .logo-image {
  filter: brightness(1.2);
  transform: scale(1.05);
}

/* 响应式调整 */
@media (max-width: 768px) {
  .mdfriday-brand {
    gap: 1rem;
  }
  
  .logo-image {
    height: 45px;
  }
}

/* 服务区域 */
.services {
  background: var(--color-bg-secondary);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.service-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  transform: scaleX(0);
  transition: var(--transition-normal);
}

.service-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

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

.service-icon {
  width: 60px;
  height: 60px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
  color: white;
}

.service-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--color-text-primary);
}

.service-description {
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.service-features {
  list-style: none;
}

.service-features li {
  color: var(--color-text-tertiary);
  margin-bottom: 0.5rem;
  position: relative;
  padding-left: 1.5rem;
}

.service-features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-secondary);
  font-weight: bold;
}

.service-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.5rem;
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  transition: var(--transition-fast);
}

.service-link:hover {
  color: var(--color-primary-light);
  transform: translateX(5px);
}

.service-link i {
  transition: var(--transition-fast);
}

/* 作品展示区域 */
.portfolio-filter {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.filter-btn {
  background: transparent;
  border: 2px solid var(--color-border);
  color: var(--color-text-secondary);
  padding: 0.5rem 1rem;
  border-radius: 25px;
  cursor: pointer;
  transition: var(--transition-fast);
  font-weight: 500;
}

.filter-btn:hover,
.filter-btn.active {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(99, 102, 241, 0.1);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.portfolio-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
  transition: var(--transition-normal);
  opacity: 1;
  transform: scale(1);
}

.portfolio-item.hidden {
  opacity: 0;
  transform: scale(0.8);
  pointer-events: none;
}

.portfolio-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

.portfolio-image {
  height: 200px;
  background: linear-gradient(135deg, var(--color-bg-tertiary), var(--color-bg-secondary));
  position: relative;
  overflow: hidden;
}

.portfolio-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  font-size: 3rem;
  color: var(--color-text-tertiary);
}

.portfolio-content {
  padding: 1.5rem;
}

.portfolio-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
}

.portfolio-description {
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  line-height: 1.5;
}

.portfolio-tech {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.tech-tag {
  background: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: 15px;
  font-size: 0.875rem;
  border: 1px solid var(--color-border);
}

.portfolio-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  transition: var(--transition-fast);
}

.portfolio-link:hover {
  color: var(--color-primary-light);
  transform: translateX(3px);
}

.portfolio-link i {
  font-size: 0.8rem;
}

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

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-intro {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.about-avatar {
  flex-shrink: 0;
}

.avatar-placeholder {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: white;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.about-photo {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  object-position: center;
}

.about-personal h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
}

.about-title {
  color: var(--color-primary);
  font-weight: 500;
  font-size: 1rem;
}

.about-highlights {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-top: 2rem;
}

.highlight-badge {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  transition: var(--transition-fast);
}

.highlight-badge:hover {
  border-color: var(--color-primary);
  transform: translateX(5px);
}

.highlight-badge i {
  color: var(--color-primary);
  font-size: 1.1rem;
  width: 20px;
  text-align: center;
}

.highlight-badge span {
  color: var(--color-text-secondary);
  font-weight: 500;
}

.about-description {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 2rem;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.stat-label {
  color: var(--color-text-secondary);
  font-weight: 500;
}

.about-skills h3 {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  color: var(--color-text-primary);
}

.skill-item {
  margin-bottom: 1.5rem;
}

.skill-name {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.skill-bar {
  height: 8px;
  background: var(--color-bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
}

.skill-progress {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  border-radius: 4px;
  width: 0;
  transition: width 1s ease-out;
}

/* 联系区域 */
.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.contact-icon {
  width: 50px;
  height: 50px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: white;
}

.contact-details h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--color-text-primary);
}

.contact-details p {
  color: var(--color-text-secondary);
}

.contact-details small {
  display: block;
  color: var(--color-text-tertiary);
  font-size: 0.8rem;
  margin-top: 0.25rem;
}

/* 微信群二维码样式 */
.wechat-qr {
  margin-top: 1rem;
}

.qr-code-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 1rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  transition: var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.qr-code-container:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.qr-code-image {
  width: 160px;
  height: 160px;
  border-radius: 8px;
  object-fit: cover;
  margin-bottom: 0.75rem;
  transition: var(--transition-fast);
}

.qr-code-container:hover .qr-code-image {
  transform: scale(1.02);
}

.qr-code-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin: 0 0 0.25rem 0;
}

.qr-code-desc {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  line-height: 1.2;
  margin: 0;
}

/* 响应式调整 */
@media (max-width: 768px) {
  .qr-code-image {
    width: 140px;
    height: 140px;
  }
  
  .qr-code-container {
    padding: 0.75rem;
  }
}

.social-links {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
}

.social-link {
  width: 45px;
  height: 45px;
  border-radius: 10px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: var(--transition-fast);
  font-size: 1.2rem;
}

.social-link:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-2px);
}

/* 表单样式 */
.contact-form {
  background: var(--color-bg-card);
  padding: 2rem;
  border-radius: 12px;
  border: 1px solid var(--color-border);
}

.form-group {
  position: relative;
  margin-bottom: 2rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 1rem;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  color: var(--color-text-primary);
  font-size: 1rem;
  transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group label {
  position: absolute;
  top: 1rem;
  left: 1rem;
  color: var(--color-text-tertiary);
  transition: var(--transition-fast);
  pointer-events: none;
}

.form-group input:focus + label,
.form-group input:valid + label,
.form-group textarea:focus + label,
.form-group textarea:valid + label {
  top: -0.5rem;
  left: 0.75rem;
  font-size: 0.875rem;
  color: var(--color-primary);
  background: var(--color-bg-card);
  padding: 0 0.5rem;
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

/* 页脚 */
.footer {
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: 3rem 0 1rem;
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 2rem;
}

.footer-logo {
  display: flex;
  align-items: center;
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--color-text-primary);
}

.footer-logo i {
  color: var(--color-primary);
  margin-right: 0.5rem;
}

.footer-description {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.footer-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--color-text-primary);
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: var(--transition-fast);
}

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

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-tertiary);
}

/* 回到顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--color-primary);
  color: white;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: var(--transition-normal);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  z-index: 1000;
}

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

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
}

/* 动画 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.1);
    opacity: 0.8;
  }
}

@keyframes flow {
  0% {
    opacity: 0;
    transform: translateX(-100%);
  }
  50% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: translateX(100%);
  }
}

/* 响应式设计 */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 3rem;
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .about-content,
  .contact-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }
  
  .nav-container {
    padding: 0 1rem;
  }
  
  .hero-intro {
    flex-direction: column;
    text-align: center;
    gap: 1.5rem;
  }
  
  .avatar-image {
    width: 100px;
    height: 100px;
    font-size: 2.5rem;
  }
  
  .nav-menu {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background: var(--color-bg-secondary);
    width: 100%;
    text-align: center;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-lg);
    padding: 2rem 0;
    border-top: 1px solid var(--color-border);
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .nav-menu li {
    margin: 1rem 0;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .nav-toggle.active .bar:nth-child(2) {
    opacity: 0;
  }
  
  .nav-toggle.active .bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  
  .nav-toggle.active .bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.5rem;
  }
  
  .hero-description {
    font-size: 1rem;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .neural-network {
    width: 300px;
    height: 300px;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .services-grid,
  .portfolio-grid {
    grid-template-columns: 1fr;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .portfolio-filter {
    justify-content: center;
  }
  
  section {
    padding: 3rem 0;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1.2rem;
  }
  
  .avatar-image {
    width: 80px;
    height: 80px;
    font-size: 2rem;
  }
  
  .hero-intro {
    gap: 1rem;
  }
  
  .btn {
    padding: 0.625rem 1.25rem;
    font-size: 0.9rem;
  }
  
  .service-card,
  .contact-form {
    padding: 1.5rem;
  }
  
  .back-to-top {
    bottom: 1rem;
    right: 1rem;
    width: 45px;
    height: 45px;
  }
}

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

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

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

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

/* 选择文本样式 */
::selection {
  background: var(--color-primary);
  color: white;
}

/* 焦点样式 */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* 面包屑导航 */
.breadcrumb {
  padding: 6rem 0 2rem;
  background: var(--color-bg-secondary);
}

.breadcrumb-content {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.9rem;
}

.breadcrumb-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition-fast);
}

.breadcrumb-link:hover {
  color: var(--color-primary);
}

.breadcrumb-content i {
  color: var(--color-text-tertiary);
  font-size: 0.8rem;
}

.breadcrumb-current {
  color: var(--color-primary);
  font-weight: 500;
}

/* 服务详情页面样式 */
.service-hero {
  padding: 3rem 0 5rem;
  background: var(--color-bg-secondary);
}

.service-hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.service-icon-large {
  width: 80px;
  height: 80px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: white;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-lg);
}

.service-hero-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--color-text-primary), var(--color-text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.service-hero-subtitle {
  font-size: 1.3rem;
  color: var(--color-primary);
  margin-bottom: 1.5rem;
  font-weight: 500;
}

.service-hero-description {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 2.5rem;
}

.service-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

/* AI模型图表 */
.service-visual-container {
  display: flex;
  justify-content: center;
  align-items: center;
}

.ai-model-diagram {
  display: flex;
  gap: 3rem;
  align-items: center;
}

.layer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.layer-title {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

.neurons {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.neuron {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.3);
  animation: neuronPulse 2s ease-in-out infinite;
}

.neuron:nth-child(odd) {
  animation-delay: 0.5s;
}

@keyframes neuronPulse {
  0%, 100% {
    opacity: 0.7;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.1);
  }
}

/* 服务详情内容 */
.service-details {
  padding: 5rem 0;
}

.detail-section {
  margin-bottom: 5rem;
}

.detail-title {
  font-size: 2.2rem;
  font-weight: 600;
  margin-bottom: 2.5rem;
  text-align: center;
  color: var(--color-text-primary);
}

/* 服务分类卡片 */
.service-categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.category-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  transform: scaleX(0);
  transition: var(--transition-normal);
}

.category-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

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

.category-icon {
  width: 60px;
  height: 60px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
  color: white;
}

.category-card h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--color-text-primary);
}

.category-card p {
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.category-features {
  list-style: none;
}

.category-features li {
  color: var(--color-text-tertiary);
  margin-bottom: 0.5rem;
  position: relative;
  padding-left: 1.5rem;
  font-size: 0.9rem;
}

.category-features li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

/* 开发流程时间线 */
.process-timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.process-timeline::before {
  content: '';
  position: absolute;
  left: 30px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border-light);
}

.process-step {
  display: flex;
  align-items: flex-start;
  gap: 2rem;
  margin-bottom: 3rem;
  position: relative;
}

.step-number {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 600;
  flex-shrink: 0;
  box-shadow: var(--shadow-md);
  position: relative;
  z-index: 1;
}

.step-content {
  flex: 1;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  position: relative;
}

.step-content h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
}

.step-content p {
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 1rem;
}

.step-duration {
  display: inline-block;
  background: var(--color-bg-tertiary);
  color: var(--color-primary);
  padding: 0.25rem 0.75rem;
  border-radius: 15px;
  font-size: 0.8rem;
  font-weight: 500;
  border: 1px solid var(--color-border);
}

/* 技术栈 */
.tech-stack {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.tech-category {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
}

.tech-category h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--color-text-primary);
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tech-tag.featured {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: white;
  border: none;
}

/* 案例研究 */
.case-studies {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 2rem;
}

.case-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  transition: var(--transition-normal);
}

.case-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.case-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.case-icon {
  width: 50px;
  height: 50px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: white;
}

.case-info h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--color-text-primary);
}

.case-client {
  color: var(--color-text-tertiary);
  font-size: 0.9rem;
}

.case-description {
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.case-results {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.result-item {
  text-align: center;
  padding: 1rem;
  background: var(--color-bg-tertiary);
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.result-label {
  display: block;
  color: var(--color-text-tertiary);
  font-size: 0.8rem;
  margin-bottom: 0.25rem;
}

.result-value {
  display: block;
  color: var(--color-primary);
  font-size: 1.2rem;
  font-weight: 600;
}

.case-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* 服务优势 */
.advantages {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

.advantage-item {
  text-align: center;
  padding: 2rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  transition: var(--transition-normal);
}

.advantage-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.advantage-icon {
  width: 60px;
  height: 60px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  font-size: 1.5rem;
  color: white;
}

.advantage-item h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--color-text-primary);
}

.advantage-item p {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 咨询CTA */
.consultation-cta {
  background: linear-gradient(135deg, var(--color-bg-card), var(--color-bg-tertiary));
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 3rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.consultation-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.cta-content {
  position: relative;
  z-index: 1;
}

.cta-content h2 {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--color-text-primary);
}

.cta-content p {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* 作品详情页面样式 */
.portfolio-hero {
  padding: 3rem 0 5rem;
  background: var(--color-bg-secondary);
}

.portfolio-hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.project-category {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-bg-tertiary);
  color: var(--color-primary);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 1.5rem;
  border: 1px solid var(--color-border);
}

.portfolio-hero-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--color-text-primary), var(--color-text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.portfolio-hero-subtitle {
  font-size: 1.3rem;
  color: var(--color-primary);
  margin-bottom: 1.5rem;
  font-weight: 500;
}

.portfolio-hero-description {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 2rem;
}

.project-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
}

.meta-item {
  text-align: center;
}

.meta-label {
  display: block;
  color: var(--color-text-tertiary);
  font-size: 0.8rem;
  margin-bottom: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.meta-value {
  display: block;
  color: var(--color-text-primary);
  font-size: 1.1rem;
  font-weight: 600;
}

.project-tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* 项目展示区域 */
.project-showcase {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.showcase-image {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 3rem;
  text-align: center;
}

.image-placeholder {
  color: var(--color-text-tertiary);
}

.image-placeholder i {
  font-size: 4rem;
  margin-bottom: 1rem;
  display: block;
}

.image-placeholder p {
  font-size: 1rem;
  margin: 0;
}

.project-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.stat-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1rem;
  transition: var(--transition-fast);
}

.stat-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.stat-icon {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.1rem;
}

.stat-number {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--color-text-tertiary);
}

/* 项目概述 */
.project-overview {
  max-width: 800px;
  margin: 0 auto;
}

.overview-content h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin: 2rem 0 1rem 0;
  color: var(--color-text-primary);
}

.overview-content h3:first-child {
  margin-top: 0;
}

.overview-content p {
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.objective-list {
  list-style: none;
  padding: 0;
}

.objective-list li {
  position: relative;
  padding-left: 2rem;
  margin-bottom: 0.75rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.objective-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-secondary);
  font-weight: bold;
  font-size: 1.1rem;
}

.challenges {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.challenge-item {
  display: flex;
  gap: 1rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.5rem;
}

.challenge-icon {
  width: 50px;
  height: 50px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-accent), #f97316);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.challenge-content h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
}

.challenge-content p {
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin: 0;
  font-size: 0.9rem;
}

/* 技术架构 */
.architecture-diagram {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.arch-layer {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  position: relative;
}

.arch-layer h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--color-primary);
  text-align: center;
}

.arch-components {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
}

.arch-component {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  text-align: center;
  transition: var(--transition-fast);
}

.arch-component:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.arch-component i {
  font-size: 1.5rem;
  color: var(--color-primary);
}

.arch-component span {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* 算法详情 */
.algorithm-details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.algorithm-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  transition: var(--transition-normal);
}

.algorithm-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.algorithm-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.algorithm-icon {
  width: 50px;
  height: 50px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.2rem;
}

.algorithm-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin: 0;
}

.algorithm-content p {
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.algorithm-features {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.feature-tag {
  background: var(--color-bg-tertiary);
  color: var(--color-primary);
  padding: 0.25rem 0.75rem;
  border-radius: 15px;
  font-size: 0.8rem;
  font-weight: 500;
  border: 1px solid var(--color-border);
}

/* 实现时间线 */
.implementation-timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.implementation-timeline::before {
  content: '';
  position: absolute;
  left: 25px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border-light);
}

.timeline-item {
  display: flex;
  gap: 2rem;
  margin-bottom: 3rem;
  position: relative;
}

.timeline-marker {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.1rem;
  flex-shrink: 0;
  box-shadow: var(--shadow-md);
  position: relative;
  z-index: 1;
}

.timeline-content {
  flex: 1;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
}

.timeline-content h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
}

.timeline-content > p {
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.timeline-details ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.5rem;
}

.timeline-details li {
  position: relative;
  padding-left: 1.5rem;
  color: var(--color-text-tertiary);
  font-size: 0.9rem;
}

.timeline-details li::before {
  content: '•';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: bold;
}

/* 项目结果 */
.project-results {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.results-overview {
  display: flex;
  justify-content: center;
}

.result-card.highlight {
  background: linear-gradient(135deg, var(--color-bg-card), var(--color-bg-tertiary));
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 3rem;
  text-align: center;
  max-width: 600px;
  position: relative;
  overflow: hidden;
}

.result-card.highlight::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(circle at 20% 80%, rgba(99, 102, 241, 0.05) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(16, 185, 129, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.result-card .result-content {
  position: relative;
  z-index: 1;
}

.result-card .result-icon {
  width: 80px;
  height: 80px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 2rem;
  font-size: 2rem;
  color: white;
  box-shadow: var(--shadow-lg);
}

.result-card h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 2rem;
  color: var(--color-text-primary);
}

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

.metric-item {
  text-align: center;
}

.metric-value {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.metric-label {
  display: block;
  color: var(--color-text-secondary);
  font-weight: 500;
}

.additional-results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.result-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  transition: var(--transition-fast);
}

.result-item:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.result-item .result-icon {
  width: 50px;
  height: 50px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.result-text h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
}

.result-text p {
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

/* 技术亮点 */
.tech-highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.highlight-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
  transition: var(--transition-normal);
}

.highlight-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.highlight-card .highlight-icon {
  width: 60px;
  height: 60px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  font-size: 1.5rem;
  color: white;
}

.highlight-card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--color-text-primary);
}

.highlight-card p {
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 经验总结 */
.lessons-learned {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 3rem;
  max-width: 900px;
  margin: 0 auto;
}

.lesson-category h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--color-primary);
}

.lesson-list {
  list-style: none;
  padding: 0;
}

.lesson-list li {
  position: relative;
  padding-left: 2rem;
  margin-bottom: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.lesson-list li::before {
  content: '💡';
  position: absolute;
  left: 0;
  font-size: 1.1rem;
}

/* 相关项目 */
.related-projects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.related-project-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 2rem;
  transition: var(--transition-normal);
}

.related-project-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}

.related-project-card .project-icon {
  width: 60px;
  height: 60px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.project-info h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--color-text-primary);
}

.project-info p {
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  line-height: 1.5;
}

.project-link {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  transition: var(--transition-fast);
}

.project-link:hover {
  color: var(--color-primary-light);
}

.project-link i {
  margin-left: 0.25rem;
  font-size: 0.8rem;
}