@import url('style.css');

.papers-section {
    background: #fff;
    padding: 80px 0;
}

.section-intro {
    text-align: center;
    color: #666;
    font-size: 16px;
    line-height: 1.8;
    max-width: 800px;
    margin: 20px auto 40px;
}

.papers-filters {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 10px 25px;
    background: #f0f0f0;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 600;
    color: #555;
    cursor: pointer;
    transition: all 0.3s;
}

.filter-btn:hover {
    background: #e0e0e0;
    border-color: #204198;
}

.filter-btn.active {
    background: #204198;
    color: #fff;
    border-color: #204198;
}

.papers-list {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.paper-item {
    background: #fff;
    border-radius: 12px;
    padding: 30px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    border-left: 4px solid #204198;
    transition: all 0.3s;
}

.paper-item:hover {
    box-shadow: 0 8px 30px rgba(32, 65, 152, 0.15);
    transform: translateY(-3px);
}

.paper-number {
    display: inline-block;
    background: #204198;
    color: #fff;
    padding: 5px 15px;
    border-radius: 4px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 15px;
}

.paper-title {
    font-size: 22px;
    color: #204198;
    font-weight: 700;
    margin: 0 0 15px 0;
    line-height: 1.4;
}

.paper-authors {
    font-size: 16px;
    color: #555;
    margin-bottom: 8px;
    line-height: 1.8;
}

.paper-affiliation {
    font-size: 14px;
    color: #666;
    font-style: italic;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #e0e0e0;
}

.paper-abstract {
    margin-bottom: 20px;
}

.paper-abstract p {
    font-size: 15px;
    color: #555;
    line-height: 1.8;
    margin: 0;
}

.paper-links {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.paper-link {
    display: inline-block;
    padding: 8px 18px;
    background: #204198;
    color: #fff;
    text-decoration: none;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
}

.paper-link:hover {
    background: #2d5bb8;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(32, 65, 152, 0.3);
}

@media (max-width: 768px) {
    .papers-section {
        padding: 50px 0;
    }
    
    .paper-item {
        padding: 20px;
    }
    
    .paper-title {
        font-size: 20px;
    }
}

@media (max-width: 480px) {
    .paper-item {
        padding: 15px;
    }
    
    .paper-title {
        font-size: 18px;
    }
}