:root {
  --primary-color: #2c3e50;
  --secondary-color: #34495e;
  --accent-color: #3498db;
  --background-color: #f5f6fa;
  --text-color: #2c3e50;
  --sidebar-width: 280px;
}

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

body {
  font-family: 'Segoe UI', sans-serif;
  color: var(--text-color);
  line-height: 1.6;
  background-color: var(--background-color);
}

.layout {
  display: flex;
  min-height: 100vh;
}

/* 侧边栏样式 */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--primary-color);
  color: white;
  padding: 2rem;
  position: fixed;
  height: 100vh;
}

.profile {
  text-align: center;
  margin-bottom: 2rem;
}

.avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 1rem;
  border: 3px solid white;
}

.sidebar h1 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

.sidebar p {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.9rem;
}

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

.nav-links li {
  margin: 1rem 0;
}

.nav-links a {
  color: white;
  text-decoration: none;
  display: flex;
  align-items: center;
  padding: 0.5rem;
  border-radius: 4px;
  transition: all 0.3s ease;
}

.nav-links a:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.nav-links i {
  width: 24px;
  margin-right: 0.75rem;
  text-align: center;
}

/* 内容区域样式 */
.content {
  margin-left: var(--sidebar-width);
  flex: 1;
  padding: 2rem;
}

.card {
  background: white;
  border-radius: 8px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.card h2 {
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--accent-color);
}

/* 时间轴样式 */
.timeline {
  position: relative;
  padding-left: 30px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 0;
  height: 100%;
  width: 2px;
  background: var(--accent-color);
}

.timeline-item {
  position: relative;
  margin-bottom: 2rem;
  padding-left: 20px;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-color);
  border: 2px solid white;
}

.timeline-item h3 {
  color: var(--primary-color);
  margin-bottom: 0.5rem;
}

.date {
  color: #7f8c8d;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

/* 荣誉徽章样式 */
.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.badge {
  background: var(--accent-color);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.9rem;
}

/* 联系方式样式 */
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-info p {
  display: flex;
  align-items: center;
}

.contact-info i {
  width: 24px;
  margin-right: 0.75rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .layout {
    flex-direction: column;
  }

  .sidebar {
    position: static;
    width: 100%;
    height: auto;
  }

  .content {
    margin-left: 0;
    padding: 1rem;
  }

  .card {
    padding: 1.5rem;
  }
}