:root {
    --primary-color: #2c3e50;
    --secondary-color: #34495e;
    --accent-color: #3498db;
    --text-color: #2c3e50;
    --background-color: #f8f9fa;
    --card-bg: #ffffff;
}

body {
    font-family: 'Georgia', '宋体', serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    margin: 0;
    padding: 20px;
}

.academic-header {
    background: var(--primary-color);
    color: white;
    padding: 2rem 0;
    text-align: center;
    border-radius: 10px;
    margin-bottom: 2rem;
}

.profile-avatar {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    border: 4px solid white;
    margin-bottom: 1rem;
}

.academic-title {
    font-size: 1.4rem;
    letter-spacing: 2px;
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 2rem auto;
}

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

.timeline-item {
    position: relative;
    width: 50%;
    padding: 20px;
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin: 1rem 0;
}

.timeline-item:nth-child(odd) {
    left: 0;
    clear: both;
}

.timeline-item:nth-child(even) {
    left: 50%;
}

.timeline-date {
    color: var(--accent-color);
    font-weight: bold;
}

.awards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
}

.award-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    text-align: center;
}

.academic-footer {
    background: var(--secondary-color);
    color: white;
    padding: 2rem;
    text-align: center;
    margin-top: 3rem;
    border-radius: 10px;
}

.qq-link {
    color: white;
    text-decoration: none;
    font-size: 1.2rem;
}

.qq-link:hover {
    color: var(--accent-color);
}

@media (max-width: 768px) {
    .timeline::after {
        left: 31px;
    }

    .timeline-item {
        width: 100%;
        left: 0;
        margin-left: 0;
    }
}