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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  color: #333;
  overflow-x: hidden;
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 50%, #faf5ff 100%);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Background Effects */
.background-effects {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
}

.bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  animation: pulse 4s ease-in-out infinite;
}

.bg-orb-1 {
  top: -160px;
  right: -160px;
  width: 320px;
  height: 320px;
  background: linear-gradient(45deg, rgba(59, 130, 246, 0.2), rgba(147, 51, 234, 0.2));
}

.bg-orb-2 {
  bottom: -160px;
  left: -160px;
  width: 320px;
  height: 320px;
  background: linear-gradient(45deg, rgba(236, 72, 153, 0.2), rgba(251, 191, 36, 0.2));
  animation-delay: 2s;
}

.bg-orb-3 {
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 400px;
  height: 400px;
  background: linear-gradient(45deg, rgba(6, 182, 212, 0.1), rgba(59, 130, 246, 0.1));
  animation: spin-slow 20s linear infinite;
}

/* Header */
.header {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
}

.logo-section {
  display: flex;
  align-items: center;
  gap: 16px;
}

.logo-container {
  position: relative;
}

.logo {
  width: 48px;
  height: 48px;
  background: linear-gradient(45deg, #3b82f6, #8b5cf6, #ec4899);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 24px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.ping-dot {
  position: absolute;
  top: -4px;
  right: -4px;
  width: 16px;
  height: 16px;
  background: #fbbf24;
  border-radius: 50%;
  animation: ping 2s cubic-bezier(0, 0, 0.2, 1) infinite;
}

.logo-title {
  font-size: 24px;
  font-weight: bold;
  background: linear-gradient(45deg, #3b82f6, #8b5cf6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-subtitle {
  font-size: 14px;
  color: #6b7280;
  display: flex;
  align-items: center;
  gap: 4px;
}

.header-actions {
  display: flex;
  gap: 16px;
}

/* Buttons */
.btn {
  padding: 8px 16px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.3s ease;
  text-decoration: none;
}

.btn-outline {
  background: transparent;
  border: 1px solid #d1d5db;
  color: #374151;
}

.btn-outline:hover {
  background: #f3f4f6;
}

.btn-primary {
  background: linear-gradient(45deg, #3b82f6, #8b5cf6);
  color: white;
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

/* 菜鸟教程按钮绿色小鸟图标 */
.btn-outline .fa-dove {
  color: #10b981;
}

/* Hero Section */
.hero {
  padding: 120px 0;
  text-align: center;
  position: relative;
}

.hero-content {
  max-width: 1000px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(45deg, rgba(59, 130, 246, 0.1), rgba(147, 51, 234, 0.1));
  color: #1e40af;
  padding: 12px 24px;
  border-radius: 50px;
  font-size: 18px;
  font-weight: 500;
  margin-bottom: 32px;
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.15);
}

.hero-title {
  font-size: clamp(3rem, 8vw, 7rem);
  font-weight: bold;
  margin-bottom: 32px;
  line-height: 1.1;
}

.gradient-text {
  background: linear-gradient(45deg, #3b82f6, #8b5cf6, #ec4899);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
}

.animate-gradient {
  animation: gradient 3s ease infinite;
}

.hero-description {
  font-size: 24px;
  color: #374151;
  margin-bottom: 48px;
  line-height: 1.6;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.highlight-blue {
  color: #3b82f6;
  font-weight: 600;
}

.highlight-purple {
  color: #8b5cf6;
  font-weight: 600;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
  margin-bottom: 48px;
}

.btn-hero {
  background: linear-gradient(45deg, #3b82f6, #8b5cf6, #ec4899);
  color: white;
  font-size: 18px;
  padding: 16px 32px;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(59, 130, 246, 0.3);
  transition: all 0.3s ease;
}

.btn-hero:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 20px 60px rgba(59, 130, 246, 0.4);
}

.btn-hero-outline {
  background: transparent;
  border: 2px solid #d1d5db;
  color: #374151;
  font-size: 18px;
  padding: 14px 30px;
  border-radius: 12px;
  transition: all 0.3s ease;
}

.btn-hero-outline:hover {
  background: linear-gradient(45deg, rgba(59, 130, 246, 0.05), rgba(147, 51, 234, 0.05));
  transform: translateY(-4px) scale(1.05);
}

/* Difficulty Level Buttons */
.btn-hero-beginner {
  background: linear-gradient(45deg, #10b981, #34d399);
  color: white;
  font-size: 18px;
  padding: 16px 32px;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(16, 185, 129, 0.3);
  transition: all 0.3s ease;
  margin: 0 8px;
}

.btn-hero-beginner:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 20px 60px rgba(16, 185, 129, 0.4);
}

.btn-hero-intermediate {
  background: linear-gradient(45deg, #f59e0b, #fbbf24);
  color: white;
  font-size: 18px;
  padding: 16px 32px;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(245, 158, 11, 0.3);
  transition: all 0.3s ease;
  margin: 0 8px;
}

.btn-hero-intermediate:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 20px 60px rgba(245, 158, 11, 0.4);
}

.btn-hero-advanced {
  background: linear-gradient(45deg, #ef4444, #f87171);
  color: white;
  font-size: 18px;
  padding: 16px 32px;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(239, 68, 68, 0.3);
  transition: all 0.3s ease;
  margin: 0 8px;
}

.btn-hero-advanced:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 20px 60px rgba(239, 68, 68, 0.4);
}

/* Course Directory Header */
.course-directory-header {
  text-align: center;
  margin: 60px 0 40px 0;
  padding: 40px 20px;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  border-radius: 20px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.course-directory-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(45deg, #3b82f6, #8b5cf6);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  color: white;
  font-size: 32px;
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
}

.course-directory-title {
  font-size: 36px;
  font-weight: bold;
  margin-bottom: 16px;
}

.course-directory-description {
  font-size: 16px;
  color: #6b7280;
  line-height: 1.6;
}

/* Achievements */
.achievements {
  display: flex;
  justify-content: center;
  gap: 16px;
  max-width: 720px;
  margin: 0 auto;
  flex-wrap: wrap;
}

.achievement-item {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  border-radius: 14px;
  padding: 20px;
  text-align: center;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  flex: 0 0 auto;
  min-width: 140px;
  max-width: 160px;
}

.achievement-item:hover {
  transform: translateY(-8px) scale(1.05);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.achievement-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 10px;
  color: white;
  font-size: 18px;
}

.achievement-gold {
  background: linear-gradient(45deg, #f59e0b, #f97316);
}

.achievement-purple {
  background: linear-gradient(45deg, #8b5cf6, #ec4899);
}

.achievement-blue {
  background: linear-gradient(45deg, #3b82f6, #06b6d4);
}

.achievement-red {
  background: linear-gradient(45deg, #ef4444, #f97316);
}

.achievement-green {
  background: linear-gradient(45deg, #10b981, #059669);
}

.achievement-orange {
  background: linear-gradient(45deg, #f59e0b, #d97706);
}

.course-link {
  text-decoration: none;
  color: inherit;
}

.course-link:hover {
  text-decoration: none;
  color: inherit;
}

.achievement-item h3 {
  font-size: 14px;
  font-weight: 600;
  color: #1f2937;
  margin-bottom: 4px;
}

.achievement-item p {
  font-size: 12px;
  color: #6b7280;
}

/* Stats Section */
.stats {
  padding: 80px 0;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(10px);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
}

.stat-item {
  text-align: center;
  transition: all 0.3s ease;
}

.stat-item:hover {
  transform: scale(1.1);
}

.stat-icon {
  position: relative;
  width: 64px;
  height: 64px;
  background: linear-gradient(45deg, #3b82f6, #8b5cf6);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  color: white;
  font-size: 32px;
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
  transition: all 0.3s ease;
}

.stat-item:hover .stat-icon {
  box-shadow: 0 15px 40px rgba(59, 130, 246, 0.4);
}

.stat-sparkle {
  position: absolute;
  top: -8px;
  right: -8px;
  width: 24px;
  height: 24px;
  background: #fbbf24;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #92400e;
  font-size: 12px;
}

.stat-value {
  font-size: 48px;
  font-weight: bold;
  margin-bottom: 8px;
}

.stat-blue .stat-value {
  color: #3b82f6;
}

.stat-purple .stat-value {
  color: #8b5cf6;
}

.stat-green .stat-value {
  color: #10b981;
}

.stat-orange .stat-value {
  color: #f59e0b;
}

.stat-label {
  color: #6b7280;
  font-weight: 500;
}

/* Business Projects Section */
.middleware-projects-header {
  text-align: center;
  margin: 80px 0 40px 0;
  padding-top: 40px;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.middleware-projects-title {
  font-size: 48px;
  font-weight: bold;
  margin-bottom: 24px;
}

.middleware-projects-description {
  font-size: 18px;
  color: #6b7280;
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.6;
}

.middleware-projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

/* Other Projects Section */
.other-projects-header {
  text-align: center;
  margin: 80px 0 40px 0;
  padding-top: 40px;
  border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.other-projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 24px;
  margin-top: 40px;
}

/* Courses Section */
.courses {
  padding: 120px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 80px;
}

.section-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(45deg, #3b82f6, #8b5cf6);
  border-radius: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  color: white;
  font-size: 40px;
  box-shadow: 0 15px 40px rgba(59, 130, 246, 0.3);
}

.section-title {
  font-size: 60px;
  font-weight: bold;
  margin-bottom: 24px;
}

.section-description {
  font-size: 20px;
  color: #6b7280;
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.6;
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: 32px;
}

.course-card {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
  transition: all 0.5s ease;
  position: relative;
}

.course-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.15);
}

.course-header-line {
  height: 8px;
  background: linear-gradient(45deg, #3b82f6, #8b5cf6, #ec4899);
}

.course-header {
  padding: 24px;
  padding-bottom: 16px;
}

.course-meta {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 16px;
}

.course-icon-section {
  display: flex;
  align-items: center;
  gap: 16px;
}

.course-icon-container {
  position: relative;
}

.course-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(45deg, #3b82f6, #8b5cf6);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 32px;
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3);
  transition: all 0.3s ease;
}

.course-card:hover .course-icon {
  transform: scale(1.1);
}

.course-star {
  position: absolute;
  top: -4px;
  right: -4px;
  width: 20px;
  height: 20px;
  background: #fbbf24;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #92400e;
  font-size: 12px;
}

.course-badges {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.course-badge {
  background: rgba(59, 130, 246, 0.1);
  color: #1e40af;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
}

.course-badge-outline {
  background: transparent;
  border: 1px solid #d1d5db;
  color: #6b7280;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 10px;
}

.course-title {
  font-size: 20px;
  font-weight: bold;
  color: #1f2937;
  margin-bottom: 12px;
  line-height: 1.3;
  transition: color 0.3s ease;
}

.course-card:hover .course-title {
  color: #3b82f6;
}

.course-description {
  font-size: 14px;
  color: #6b7280;
  line-height: 1.5;
}

.course-content {
  padding: 0 24px 24px;
}

.course-info {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 16px;
}

.course-info-item {
  background: rgba(59, 130, 246, 0.05);
  border-radius: 8px;
  padding: 12px;
  text-align: center;
}

.course-info-item.purple {
  background: rgba(147, 51, 234, 0.05);
}

.course-info-item.green {
  background: rgba(16, 185, 129, 0.05);
}

.course-info-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 600;
}

.course-info-content.blue {
  color: #3b82f6;
}

.course-info-content.purple {
  color: #8b5cf6;
}

.course-info-content.green {
  color: #10b981;
}

.difficulty-section {
  margin-bottom: 16px;
}

.difficulty-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.difficulty-label {
  font-size: 14px;
  font-weight: 500;
  color: #374151;
}

.difficulty-value {
  font-size: 14px;
  font-weight: bold;
  color: #1f2937;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: #e5e7eb;
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(45deg, #3b82f6, #8b5cf6);
  border-radius: 4px;
  /* 移除过渡动画效果 */
  /* transition: width 0.3s ease; */
}

.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.tech-tag {
  background: linear-gradient(45deg, rgba(59, 130, 246, 0.05), rgba(147, 51, 234, 0.05));
  border: 1px solid rgba(59, 130, 246, 0.2);
  color: #3b82f6;
  padding: 4px 8px;
  border-radius: 12px;
  font-size: 10px;
  font-weight: 500;
}

.tech-tag.more {
  background: #f9fafb;
  border: 1px solid #d1d5db;
  color: #6b7280;
}

.course-action {
  width: 100%;
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  color: #374151;
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  transform: translateY(0);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

/* 添加按钮内部光效 */
.course-action::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.6s ease;
  z-index: 1;
}

.course-card:hover .course-action {
  background: linear-gradient(45deg, #3b82f6, #8b5cf6);
  color: white;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3), 0 4px 12px rgba(139, 92, 246, 0.2);
}

/* 悬停时触发光效动画 */
.course-card:hover .course-action::before {
  left: 100%;
}

.course-action-content {
  display: flex;
  align-items: center;
  gap: 8px;
  position: relative;
  z-index: 2;
  transition: transform 0.3s ease;
}

/* 悬停时内容轻微放大 */
.course-card:hover .course-action-content {
  transform: scale(1.02);
}

.course-action-arrow {
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  z-index: 2;
}

.course-card:hover .course-action-arrow {
  transform: translateX(6px) scale(1.1);
  filter: drop-shadow(0 0 4px rgba(255, 255, 255, 0.5));
}

/* 为链接按钮添加相同的效果 */
.course-action-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-decoration: none;
  color: inherit;
  width: 100%;
  padding: 12px 16px;
  border: 1px solid #e5e7eb;
  background: #f9fafb;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  transform: translateY(0);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.course-action-link::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  transition: left 0.6s ease;
  z-index: 1;
}

.course-card:hover .course-action-link {
  background: linear-gradient(45deg, #3b82f6, #8b5cf6);
  color: white;
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.3), 0 4px 12px rgba(139, 92, 246, 0.2);
}

.course-card:hover .course-action-link::before {
  left: 100%;
}

.course-action-link:hover {
  text-decoration: none;
  color: inherit;
}

.course-action-link:visited {
  color: inherit;
}

.course-action-link:focus {
  outline: none;
  text-decoration: none;
  color: inherit;
}

/* 添加按钮点击效果 */
.course-action:active,
.course-action-link:active {
  transform: translateY(-1px) scale(0.98);
  transition: all 0.1s ease;
}

/* 为按钮文字添加微妙的动画 */
.course-action-content i {
  transition: transform 0.3s ease;
}

.course-card:hover .course-action-content i {
  transform: rotate(5deg) scale(1.1);
}

/* Professor Section */
.professor {
  padding: 120px 0;
  background: linear-gradient(45deg, #3b82f6, #8b5cf6, #ec4899);
  color: white;
  position: relative;
  overflow: hidden;
}

.professor::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.1);
}

.professor-bg-effects {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}

.professor-orb {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  filter: blur(40px);
  animation: pulse 4s ease-in-out infinite;
}

.professor-orb-1 {
  top: 40px;
  left: 40px;
  width: 128px;
  height: 128px;
}

.professor-orb-2 {
  bottom: 40px;
  right: 40px;
  width: 160px;
  height: 160px;
  animation-delay: 2s;
}

.professor-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 10;
}

.professor-avatar {
  position: relative;
  margin-bottom: 32px;
}

.professor-avatar img {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  border: 4px solid rgba(255, 255, 255, 0.3);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

.professor-badge {
  position: absolute;
  top: -8px;
  right: -8px;
  width: 40px;
  height: 40px;
  background: #fbbf24;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #92400e;
  font-size: 24px;
  box-shadow: 0 8px 25px rgba(251, 191, 36, 0.3);
}

.professor-name {
  font-size: 48px;
  font-weight: bold;
  margin-bottom: 16px;
}

.professor-title {
  font-size: 24px;
  margin-bottom: 32px;
  color: rgba(191, 219, 254, 1);
}

.professor-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
  margin-bottom: 32px;
}

.professor-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 16px;
  padding: 24px;
  text-align: left;
}

.professor-card-header {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: bold;
  margin-bottom: 16px;
  color: white;
}

.professor-card-content {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.achievement-line {
  display: flex;
  align-items: center;
  gap: 8px;
  color: rgba(255, 255, 255, 0.9);
}

.achievement-line i {
  color: #fbbf24;
}

.professor-quote {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 16px;
  padding: 32px;
}

.professor-quote h3 {
  font-size: 24px;
  font-weight: bold;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.professor-quote h3 i {
  color: #fbbf24;
}

.professor-quote p {
  font-size: 20px;
  font-style: italic;
  color: rgba(191, 219, 254, 1);
  line-height: 1.6;
}

/* CTA Section */
.cta {
  padding: 120px 0;
  background: linear-gradient(135deg, #1f2937, #3730a3, #7c3aed);
  color: white;
  position: relative;
  overflow: hidden;
}

.cta-bg-effects {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}

.cta-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  animation: pulse 4s ease-in-out infinite;
}

.cta-orb-1 {
  top: 0;
  left: 25%;
  width: 256px;
  height: 256px;
  background: rgba(59, 130, 246, 0.2);
}

.cta-orb-2 {
  bottom: 0;
  right: 25%;
  width: 256px;
  height: 256px;
  background: rgba(147, 51, 234, 0.2);
  animation-delay: 2s;
}

.cta-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  position: relative;
  z-index: 10;
}

.cta-icon {
  width: 96px;
  height: 96px;
  background: linear-gradient(45deg, #fbbf24, #f59e0b);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 32px;
  color: white;
  font-size: 48px;
  box-shadow: 0 15px 40px rgba(251, 191, 36, 0.3);
}

.cta-title {
  font-size: 60px;
  font-weight: bold;
  margin-bottom: 32px;
}

.cta-description {
  font-size: 24px;
  color: #d1d5db;
  margin-bottom: 48px;
  line-height: 1.6;
}

.cta-highlight {
  color: #fbbf24;
  font-weight: 600;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  justify-content: center;
  margin-bottom: 48px;
}

.btn-cta-primary {
  background: linear-gradient(45deg, #fbbf24, #f59e0b);
  color: #1f2937;
  font-size: 18px;
  font-weight: bold;
  padding: 16px 40px;
  border-radius: 12px;
  box-shadow: 0 15px 40px rgba(251, 191, 36, 0.3);
  transition: all 0.3s ease;
}

.btn-cta-primary:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 25px 60px rgba(251, 191, 36, 0.4);
}

.btn-cta-outline {
  background: transparent;
  border: 2px solid rgba(255, 255, 255, 0.3);
  color: white;
  font-size: 18px;
  padding: 14px 38px;
  border-radius: 12px;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

.btn-cta-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-4px) scale(1.05);
}

.cta-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 24px;
}

.cta-feature {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 16px;
  padding: 24px;
  text-align: center;
}

.cta-feature i {
  font-size: 32px;
  margin-bottom: 12px;
}

.cta-feature:nth-child(1) i {
  color: #fbbf24;
}

.cta-feature:nth-child(2) i {
  color: #60a5fa;
}

.cta-feature:nth-child(3) i {
  color: #34d399;
}

.cta-feature h3 {
  font-size: 16px;
  font-weight: bold;
  margin-bottom: 8px;
}

.cta-feature p {
  font-size: 14px;
  color: #d1d5db;
}

/* Footer */
.footer {
  padding: 80px 0;
  background: #0f172a;
  color: #9ca3af;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 32px;
  margin-bottom: 32px;
}

.footer-section h3 {
  color: white;
  font-weight: 600;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: 8px;
  cursor: pointer;
  transition: color 0.3s ease;
  font-size: 14px;
}

.footer-section ul li:hover {
  color: #60a5fa;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.footer-logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(45deg, #3b82f6, #8b5cf6);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 24px;
}

.footer-logo h3 {
  color: white;
  font-weight: bold;
  margin: 0;
}

.footer-logo p {
  font-size: 12px;
  margin: 0;
}

.footer-section p {
  font-size: 14px;
  line-height: 1.6;
}

.footer-bottom {
  border-top: 1px solid #374151;
  padding-top: 32px;
  text-align: center;
}

.footer-social {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 16px;
}

.social-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 16px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.social-icon:nth-child(1) {
  background: linear-gradient(45deg, #3b82f6, #8b5cf6);
}

.social-icon:nth-child(2) {
  background: linear-gradient(45deg, #8b5cf6, #ec4899);
}

.social-icon:nth-child(3) {
  background: linear-gradient(45deg, #10b981, #3b82f6);
}

.social-icon:hover {
  transform: scale(1.1);
}

.footer-bottom p {
  font-size: 14px;
}

.footer-bottom span {
  font-size: 12px;
  color: #6b7280;
}

/* 备案信息样式 */
.beian-info {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 16px 0;
  font-size: 12px;
  color: #d1d5db; /* 浅白色 */
  line-height: 1.4;
}

.beian-link,
.beian-gov {
  color: #d1d5db;
  text-decoration: none;
  transition: color 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.beian-link:hover,
.beian-gov:hover {
  color: #60a5fa;
}

.beian-icon {
  width: 14px;
  height: 14px;
  vertical-align: middle;
}

.beian-separator {
  display: none; /* 隐藏分隔符，因为现在是分行显示 */
}

.footer-motto {
  margin-top: 16px;
  font-size: 14px;
  color: #9ca3af;
  font-style: italic;
}

/* Animations */
@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

@keyframes ping {
  75%,
  100% {
    transform: scale(2);
    opacity: 0;
  }
}

@keyframes gradient {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

@keyframes spin-slow {
  from {
    transform: translate(-50%, -50%) rotate(0deg);
  }
  to {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    gap: 16px;
  }

  .hero-title {
    font-size: 3rem;
  }

  .hero-description {
    font-size: 18px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

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

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

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

  .professor-cards {
    grid-template-columns: 1fr;
  }

  .cta-title {
    font-size: 36px;
  }

  .cta-description {
    font-size: 18px;
  }

  .cta-actions {
    flex-direction: column;
    align-items: center;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .beian-info {
    font-size: 11px;
    gap: 6px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .hero {
    padding: 80px 0;
  }

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

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

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

  .course-info {
    grid-template-columns: 1fr;
  }

  .section-title {
    font-size: 36px;
  }

  .professor-name {
    font-size: 32px;
  }

  .professor-title {
    font-size: 18px;
  }

  .cta-features {
    grid-template-columns: 1fr;
  }
}

.project-demo {
  padding: 80px 0;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(10px);
  border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.demo-header {
  text-align: center;
  margin-bottom: 60px;
}

.demo-icon {
  width: 80px;
  height: 80px;
  background: linear-gradient(45deg, #10b981, #06b6d4);
  border-radius: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  color: white;
  font-size: 40px;
  box-shadow: 0 15px 40px rgba(16, 185, 129, 0.3);
}

.demo-title {
  font-size: 48px;
  font-weight: bold;
  margin-bottom: 24px;
}

.demo-description {
  font-size: 18px;
  color: #6b7280;
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.6;
}

.demo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
  gap: 32px;
  max-width: 1000px;
  margin: 0 auto;
}

.demo-card {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  transition: all 0.4s ease;
  position: relative;
}

.demo-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
}

.demo-card-header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.demo-card-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, rgba(255, 255, 255, 0.1), transparent);
  pointer-events: none;
}

.demo-card-icon {
  width: 60px;
  height: 60px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 28px;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.demo-badge {
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 20px;
  padding: 8px 16px;
}

.demo-badge-text {
  color: white;
  font-size: 14px;
  font-weight: 600;
}

.demo-card-content {
  padding: 32px 24px;
}

.demo-card-title {
  font-size: 22px;
  font-weight: bold;
  color: #1f2937;
  margin-bottom: 16px;
  line-height: 1.3;
}

.demo-card-description {
  font-size: 15px;
  color: #6b7280;
  line-height: 1.6;
  margin-bottom: 24px;
}

.demo-features {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.demo-feature {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: #374151;
}

.demo-feature i {
  color: #10b981;
  font-size: 16px;
}

.demo-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(45deg, #10b981, #06b6d4);
  color: white;
  padding: 14px 28px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.demo-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(16, 185, 129, 0.4);
  text-decoration: none;
  color: white;
}

.demo-btn:visited {
  color: white;
}

.demo-btn:focus {
  outline: none;
  color: white;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .demo-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .demo-card {
    margin: 0 10px;
  }
  
  .demo-title {
    font-size: 36px;
  }
  
  .demo-description {
    font-size: 16px;
  }
}

@media (max-width: 480px) {
  .project-demo {
    padding: 60px 0;
  }
  
  .demo-card-content {
    padding: 24px 20px;
  }
  
  .demo-card-header {
    padding: 20px;
  }
  
  .demo-card-icon {
    width: 50px;
    height: 50px;
    font-size: 24px;
  }
}

/* 悬浮微信二维码样式 */
.floating-wechat {
  position: fixed;
  right: 30px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 9999;
  transition: all 0.3s ease;
}

.floating-wechat-trigger {
  width: 60px;
  height: 60px;
  background: linear-gradient(45deg, #07c160, #00d100);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 28px;
  cursor: pointer;
  box-shadow: 0 8px 25px rgba(7, 193, 96, 0.3);
  transition: all 0.3s ease;
  animation: pulse-wechat 2s infinite;
}

.floating-wechat-trigger:hover {
  transform: scale(1.1);
  box-shadow: 0 12px 35px rgba(7, 193, 96, 0.4);
}

.floating-wechat-content {
  position: absolute;
  right: 80px;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.3);
  width: 280px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  pointer-events: none;
}

.floating-wechat:hover .floating-wechat-content {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(-50%) translateX(-10px);
}

.wechat-qr-header {
  text-align: center;
  margin-bottom: 15px;
}

.wechat-qr-header h4 {
  font-size: 16px;
  font-weight: bold;
  color: #1f2937;
  margin-bottom: 5px;
}

.wechat-qr-header p {
  font-size: 12px;
  color: #6b7280;
  margin: 0;
}

.wechat-qr-image {
  text-align: center;
  margin-bottom: 15px;
}

.wechat-qr-image img {
  width: 160px;
  height: 160px;
  border-radius: 12px;
  border: 2px solid #f3f4f6;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.wechat-qr-info {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.wechat-id,
.wechat-note {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  padding: 8px 12px;
  border-radius: 8px;
  background: rgba(7, 193, 96, 0.05);
}

.wechat-id {
  color: #07c160;
  font-weight: 600;
}

.wechat-note {
  color: #6b7280;
  background: rgba(59, 130, 246, 0.05);
}

.wechat-id i {
  color: #07c160;
  font-size: 14px;
}

.wechat-note i {
  color: #3b82f6;
  font-size: 12px;
}

/* 微信图标脉冲动画 */
@keyframes pulse-wechat {
  0% {
    box-shadow: 0 8px 25px rgba(7, 193, 96, 0.3), 0 0 0 0 rgba(7, 193, 96, 0.7);
  }
  70% {
    box-shadow: 0 8px 25px rgba(7, 193, 96, 0.3), 0 0 0 10px rgba(7, 193, 96, 0);
  }
  100% {
    box-shadow: 0 8px 25px rgba(7, 193, 96, 0.3), 0 0 0 0 rgba(7, 193, 96, 0);
  }
}

/* 微信打招呼表情样式 */
.wechat-greeting {
  position: absolute;
  top: -8px;
  right: -8px;
  font-size: 18px;
  background: white;
  border-radius: 50%;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  animation: wave-greeting 2s ease-in-out infinite;
  z-index: 1;
}

/* 打招呼挥手动画 */
@keyframes wave-greeting {
  0%, 100% {
    transform: rotate(0deg);
  }
  25% {
    transform: rotate(-10deg);
  }
  75% {
    transform: rotate(10deg);
  }
}

/* 悬停时停止动画 */
.floating-wechat-trigger:hover .wechat-greeting {
  animation: none;
  transform: scale(1.1);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .floating-wechat {
    right: 20px;
  }
  
  .floating-wechat-trigger {
    width: 50px;
    height: 50px;
    font-size: 24px;
  }
  
  .floating-wechat-content {
    right: 70px;
    width: 250px;
    padding: 15px;
  }
  
  .wechat-qr-image img {
    width: 140px;
    height: 140px;
  }
  
  .wechat-greeting {
    font-size: 16px;
    width: 24px;
    height: 24px;
    top: -6px;
    right: -6px;
  }
}

@media (max-width: 480px) {
  .floating-wechat {
    right: 15px;
  }
  
  .floating-wechat-content {
    right: 60px;
    width: 220px;
  }
  
  .wechat-qr-image img {
    width: 120px;
    height: 120px;
  }
}