/* 全局样式 */
:root {
  --primary-color: #6a6a6a;
  --primary-light: #2a2a2a;
  --primary-dark: #8a8a8a;
  --background-color: #121212;
  --text-color: #e0e0e0;
  --shadow-light: #1f1f1f;
  --shadow-dark: #000000;
  --success-color: #198754;
  --info-color: #0dcaf0;
  --warning-color: #ffc107;
  --danger-color: #dc3545;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
  overflow-x: hidden;
  padding-top: 70px; /* 为固定导航栏留出空间 */
}

/* 新拟物化阴影效果 */
.neumorphic {
  border-radius: 20px;
  background: var(--background-color);
  box-shadow: 8px 8px 16px var(--shadow-dark),
              -8px -8px 16px var(--shadow-light);
}

.neumorphic-inset {
  border-radius: 20px;
  background: var(--background-color);
  box-shadow: inset 4px 4px 8px var(--shadow-dark),
              inset -4px -4px 8px var(--shadow-light);
}

.neumorphic-hover {
  transition: all 0.3s ease;
}


.neumorphic-hover:hover {
  box-shadow: 4px 4px 8px var(--shadow-dark),
               -4px -4px 8px var(--shadow-light);
}

/* 按钮样式 */
.btn {
  border: none;
  border-radius: 15px;
  padding: 12px 40px;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 4px 4px 8px var(--shadow-dark),
              -4px -4px 8px var(--shadow-light);
}

.btn:hover {
  box-shadow: 2px 2px 4px var(--shadow-dark),
              -2px -2px 4px var(--shadow-light);
  transform: translateY(2px);
}

.btn:active {
  box-shadow: inset 4px 4px 8px var(--shadow-dark),
              inset -4px -4px 8px var(--shadow-light);
}

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

.btn-outline-primary {
  background-color: transparent;
  color: var(--primary-color);
  box-shadow: inset 4px 4px 8px var(--shadow-dark),
              inset -4px 8px var(--shadow-light);
}

.btn-outline-primary:hover {
  background-color: var(--primary-color);
  color: white;
  box-shadow: 4px 4px 8px var(--shadow-dark),
              -4px -4px 8px var(--shadow-light);
}
/* 导航栏样式 */
.navbar {
  background-color: var(--background-color) !important;
  box-shadow: 4px 4px 8px var(--shadow-dark),
              -4px -4px 8px var(--shadow-light);
  border: none;
  padding: 10px 0;
}

.navbar-brand {
  font-weight: bold;
  font-size: 1.5rem;
  color: var(--text-color) !important;
}

.nav-link {
  font-weight: 500;
  color: var(--text-color) !important;
  transition: all 0.3s ease;
  border-radius: 10px;
  padding: 10px 15px;
  margin: 0 5px;
}

.nav-link:hover {
  color: var(--text-color) !important;
  box-shadow: inset 4px 4px 8px var(--shadow-dark),
              inset -4px 8px var(--shadow-light);
}

.navbar-toggler {
  border: none;
  outline: none !important;
  box-shadow: 2px 2px 4px var(--shadow-dark),
              -2px -2px 4px var(--shadow-light);
  border-radius: 10px;
}

.navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28106, 106, 106, 0.75%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* 横幅样式 */
.banner {
  height: 100vh;
  background: linear-gradient(rgba(18, 18, 18, 0.9), rgba(18, 18, 0.9)),
              url('https://images.unsplash.com/photo-1498050108023-c5249f4df085?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=2072&q=80') center/cover no-repeat;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  border-radius: 0 0 40px 40px;
  box-shadow: inset 10px 20px var(--shadow-dark),
              inset -10px -10px 20px var(--shadow-light);
}

.banner h1 {
  color: var(--text-color);
  text-shadow: none;
  font-weight: 700;
}

.banner p {
  color: var(--text-color);
  text-shadow: none;
  font-weight: 400;
}

/* 关于我部分 */
#about {
  background-color: transparent;
  padding: 80px 0;
}

/* 工作经验时间线 */
.timeline {
  position: relative;
  padding: 80px 0;
  background-color: transparent;
}

.timeline:before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--primary-color);
  left: 50%;
  margin-left: -2px;
}

.timeline-item {
  position: relative;
  margin-bottom: 50px;
}

.timeline-badge {
  position: absolute;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  left: 50%;
  margin-left: -25px;
  z-index: 100;
  color: white;
}

.timeline-panel {
  width: 45%;
  float: left;
}

.timeline-item:nth-child(even) .timeline-panel {
  float: right;
}

.timeline-heading h4 {
  margin-top: 0;
  color: var(--primary-color);
}

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

.timeline-body li {
  margin-bottom: 10px;
}

/* 教育背景 */
#education .card {
  transition: transform 0.3s, box-shadow 0.3s;
  background-color: var(--background-color);
  border-radius: 20px;
  box-shadow: 8px 8px 16px var(--shadow-dark),
              -8px -8px 16px var(--shadow-light);
  border: none;
}

#education .card:hover {
  transform: translateY(-5px);
  box-shadow: 4px 4px 8px var(--shadow-dark), 
              -4px -4px 8px var(--shadow-light);
}

/* 技能部分 */
#skills {
  background-color: transparent;
  padding: 80px 0;
}

#skills .card {
  transition: transform 0.3s, box-shadow 0.3s;
  background-color: var(--background-color);
  border-radius: 20px;
  box-shadow: 8px 8px 16px var(--shadow-dark),
              -8px -8px 16px var(--shadow-light);
  border: none;
}

#skills .card:hover {
  transform: translateY(-10px);
  box-shadow: 4px 4px 8px var(--shadow-dark), 
              -4px -4px 8px var(--shadow-light);
}

#skills .card i {
  color: var(--primary-color);
}

.skill-bar {
  margin-bottom: 20px;
}

.skill-bar .progress {
  height: 10px;
  border-radius: 5px;
  background-color: var(--background-color);
  box-shadow: inset 4px 8px var(--shadow-dark),
              inset -4px -4px 8px var(--shadow-light);
}

.progress-bar {
  border-radius: 5px;
  box-shadow: 4px 4px 8px var(--shadow-dark),
              -4px -4px 8px var(--shadow-light);
}

/* 项目部分 */
#projects .card {
  transition: transform 0.3s, box-shadow 0.3s;
  background-color: var(--background-color);
  border-radius: 20px;
  box-shadow: 8px 8px 16px var(--shadow-dark),
              -8px -8px 16px var(--shadow-light);
  border: none;
  overflow: hidden;
  height: 100%;
}

#projects .card:hover {
  transform: translateY(-10px);
  box-shadow: 4px 4px 8px var(--shadow-dark), 
              -4px -4px 8px var(--shadow-light);
}

/* 技术博客 */
#blog .card {
  transition: transform 0.3s, box-shadow 0.3s;
  background-color: var(--background-color);
  border-radius: 20px;
  box-shadow: 8px 8px 16px var(--shadow-dark),
              -8px -8px 16px var(--shadow-light);
  border: none;
  overflow: hidden;
  height: 100%;
}

#blog .card:hover {
  transform: translateY(-5px);
  box-shadow: 4px 4px 8px var(--shadow-dark), 
              -4px -4px 8px var(--shadow-light);
}

/* 联系方式部分 */
#contact {
  background-color: transparent;
  padding: 80px 0;
}

#contact .form-control {
  background-color: var(--background-color);
  border: none;
  color: var(--text-color);
  border-radius: 15px;
  padding: 15px;
  box-shadow: inset 4px 8px var(--shadow-dark),
              inset -4px -4px 8px var(--shadow-light);
}

#contact .form-control:focus {
  background-color: var(--background-color);
  color: var(--text-color);
  border-color: var(--primary-color);
  box-shadow: inset 2px 2px 4px var(--shadow-dark),
              inset -2px -2px 4px var(--shadow-light);
}

#contact .form-label {
  font-weight: 500;
  color: var(--text-color);
  margin-bottom: 10px;
}

#contact .form-control::placeholder {
  color: var(--primary-dark);
}

/* 页脚 */
footer {
  background-color: var(--background-color);
  padding: 30px 0;
  box-shadow: inset 10px 20px var(--shadow-dark),
              inset -10px -10px 20px var(--shadow-light);
}

/* 响应式设计 */
@media (max-width: 768px) {
  body {
    padding-top: 56px; /* 小屏幕下导航栏高度不同 */
  }
  
  .banner h1 {
    font-size: 2.5rem;
  }
  
  .banner p {
    font-size: 1.2rem;
  }
  
  .timeline:before {
    left: 30px;
  }
  
  .timeline-badge {
    left: 30px;
    margin-left: 0;
  }
  
  .timeline-panel {
    width: calc(100% - 80px);
    float: right;
  }
  
  .timeline-item:nth-child(even) .timeline-panel {
    float: right;
  }
  
  #skills .col-md-4 {
    margin-bottom: 1.5rem;
  }
  
  #projects .col-md-4 {
    margin-bottom: 1.5rem;
  }
  
  #blog .col-md-4 {
    margin-bottom: 1.5rem;
  }
}

/* 动画效果 */
[data-aos] {
  transition: all 0.3s ease;
  opacity: 1;
  transform: none;
}

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

::-webkit-scrollbar-track {
  background: #1f1f1f;
}

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

::-webkit-scrollbar-thumb:hover {
  background: #5a5a5a;
}

/* 加载动画 */
.loading {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: #121212;
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(0, 0, 0, 0.1);
  border-left-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* 返回顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: none;
  z-index: 9999;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  font-size: 1.2rem;
  background-color: var(--background-color);
  color: var(--text-color);
  box-shadow: 4px 4px 8px var(--shadow-dark),
              -4px -4px 8px var(--shadow-light);
}