:root {
    --primary-color: #2B4162;  /* 深蓝学术色 */
    --secondary-color: #385F71; 
    --accent-color: #F5A65B;   /* 暖色点缀 */
    --text-color: #333333;
    --light-bg: #F8F9FA;
    --accent-gray: #6C757D;
    --font-serif: 'Noto Serif SC', serif;
    --font-sans: 'Microsoft YaHei', sans-serif;
}

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

body {
    font-family: var(--font-serif);
    line-height: 1.8;
    color: var(--text-color);
    background: linear-gradient(180deg, #FFFFFF 0%, #F8F9FA 100%);
}

/* 学术风格导航栏 */
.header {
    background: var(--primary-color);
    padding: 1.5rem 2rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-list {
    display: flex;
    justify-content: center;
    gap: 4rem;
    list-style: none;
}

.nav-list a {
    color: white;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 4px;
}

.nav-list a:hover {
    background: rgba(255, 255, 255, 0.15);
}

/* 学术内容区块 */
.section {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.06);
    border-radius: 8px;
    margin-top: 2rem;
}

.section-header {
    font-family: var(--font-sans);
    color: var(--primary-color);
    border-bottom: 3px solid var(--accent-color);
    padding-bottom: 1rem;
    margin-bottom: 2rem;
}

/* 时间轴样式 */
.timeline {
    position: relative;
    padding-left: 2rem;
    margin-left: 1rem;
}

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

.timeline-item {
    position: relative;
    margin-bottom: 3rem;
    padding-left: 2rem;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -9px;
    top: 5px;
    width: 16px;
    height: 16px;
    background: var(--accent-color);
    border-radius: 50%;
    border: 3px solid white;
}

/* 学术荣誉卡片 */
.honors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.honor-card {
    background: var(--light-bg);
    padding: 2rem;
    border-left: 4px solid var(--primary-color);
    transition: transform 0.3s ease;
}

.honor-card:hover {
    transform: translateY(-5px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-list {
        flex-direction: column;
        gap: 1.5rem;
        padding: 2rem;
        background: var(--primary-color);
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        height: 100vh;
        transition: right 0.3s ease;
    }

    .nav-list.active {
        right: 0;
    }

    .nav-toggle {
        display: block;
        position: fixed;
        right: 1rem;
        top: 1rem;
        z-index: 1001;
    }
}

/* 学术图标样式 */
.ai-icon {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-right: 1rem;
}

/* 加载动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.loaded .section {
    animation: fadeInUp 0.6s ease forwards;
}