:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --background-color: #f8fafc;
    --text-color: #1e293b;
    --card-background: #ffffff;
    --sidebar-color: #1e293b;
    --sidebar-width: 240px;
    --sidebar-active: rgba(255, 255, 255, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    margin: 0;
    display: flex;
    min-height: 100vh;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.sidebar {
    background: linear-gradient(135deg, var(--sidebar-color) 0%, #2c3e50 100%);
    color: #fff;
    width: var(--sidebar-width);
    padding: 1.5rem;
    position: fixed;
    height: 100vh;
    transition: var(--transition);
    box-shadow: 4px 0 10px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    z-index: 1000;
}

.sidebar h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid rgba(255, 255, 255, 0.1);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    letter-spacing: 0.5px;
}

.sidebar nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
}

.sidebar nav a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    padding: 0.75rem 0.9rem;
    border-radius: 8px;
    transition: var(--transition);
    font-weight: 500;
    letter-spacing: 0.3px;
    position: relative;
    overflow: hidden;
}

.sidebar nav a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, rgba(255, 255, 255, 0.1), transparent);
    opacity: 0;
    transition: var(--transition);
}

.sidebar nav a:hover::before {
    opacity: 1;
}

.sidebar nav a i {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    transition: var(--transition);
}

.sidebar nav a:hover {
    color: #fff;
    transform: translateX(5px);
    background: var(--sidebar-active);
}

.sidebar nav a:hover i {
    transform: scale(1.1);
    color: var(--primary-color);
}

.sidebar nav a.active {
    background: var(--sidebar-active);
    color: #fff;
    font-weight: 600;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.1);
}

.sidebar nav a.active i {
    color: var(--primary-color);
}

.main-content {
    margin-left: var(--sidebar-width);
    padding: 2rem;
    max-width: calc(1200px + var(--sidebar-width));
    width: 100%;
}

.card {
    background: var(--card-background);
    border-radius: 16px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    margin: 1.5rem 0;
    padding: 2rem;
    transition: var(--transition);
}

.card:hover {
    box-shadow: 0 8px 12px rgba(0, 0, 0, 0.1);
}

.card h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.75rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.5rem;
}

.fancy-card {
    background: var(--card-background);
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.fancy-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 20px rgba(0, 0, 0, 0.1);
}

.fancy-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.fancy-card-content {
    padding: 1.5rem;
}

.fancy-card h3 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.research-points {
    list-style-type: disc;
    margin-left: 1.5rem;
    margin-top: 1rem;
}

.timeline {
    position: relative;
    padding: 2rem 0;
}

.timeline-item {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
}

.timeline-date {
    min-width: 100px;
    color: var(--primary-color);
    font-weight: 600;
}

.timeline-content {
    flex: 1;
    padding: 1rem;
    background: rgba(37, 99, 235, 0.05);
    border-radius: 8px;
}

.publication-section {
    margin-bottom: 2rem;
}

.publication-section h3 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.publication-item {
    padding: 1rem;
    border-left: 3px solid var(--primary-color);
    margin: 1rem 0;
    background: rgba(37, 99, 235, 0.05);
    border-radius: 0 8px 8px 0;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.project-card {
    background: var(--card-background);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 20px rgba(0, 0, 0, 0.1);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.project-status {
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: 0.875rem;
}

.project-description {
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.project-details {
    display: flex;
    gap: 1rem;
    color: var(--text-color);
    opacity: 0.8;
    font-size: 0.875rem;
}

.project-period, .project-funding {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

@media (max-width: 768px) {
    :root {
        --sidebar-width: 100%;
    }

    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        padding: 1rem;
    }

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

    .sidebar nav {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .sidebar nav a {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
        flex: 1 1 auto;
        min-width: 150px;
        justify-content: center;
    }

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

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

    .timeline-item {
        flex-direction: column;
        gap: 0.5rem;
    }

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

/* 添加动画效果 */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.card {
    animation: fadeIn 0.5s ease-out forwards;
}