@import url('style.css');

/* Main Content 美化样式 */
.main-content {
    min-height: calc(100vh - 200px);
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 50%, #f0f7ff 100%);
    padding: 60px 0;
    position: relative;
    overflow: hidden;
}

.main-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #18306a 0%, #204198 50%, #2d5bb8 100%);
    z-index: 1;
}

.main-content::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(32, 65, 152, 0.05) 0%, transparent 70%);
    border-radius: 50%;
    z-index: 0;
}

.cfp-section {
    background: #fff;
    padding: 80px 0;
    position: relative;
    z-index: 1;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    margin: 0 20px;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.content-block {
    margin-bottom: 40px;
    padding: 35px;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    border-radius: 12px;
    border-left: 5px solid #204198;
    box-shadow: 0 3px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.content-block::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(32, 65, 152, 0.02) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 0;
}

.content-block:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(32, 65, 152, 0.15);
    border-left-color: #2d5bb8;
}

.content-block:hover::before {
    opacity: 1;
}

.content-block h3 {
    font-size: 24px;
    color: #204198;
    font-weight: 700;
    margin: 0 0 20px 0;
    position: relative;
    z-index: 1;
    transition: color 0.3s ease;
}

.content-block:hover h3 {
    color: #18306a;
}

.content-block h4 {
    font-size: 20px;
    color: #204198;
    font-weight: 600;
    margin: 0 0 15px 0;
}

.content-block p {
    font-size: 16px;
    color: #555;
    line-height: 1.8;
    margin: 0 0 15px 0;
    position: relative;
    z-index: 1;
}

.content-block p:last-child {
    margin-bottom: 0;
}

.topic-list {
    list-style: none;
    padding: 0;
    margin: 20px 0;
}

.topic-list li {
    font-size: 16px;
    color: #555;
    padding: 12px 0;
    padding-left: 30px;
    position: relative;
    line-height: 1.8;
    border-bottom: 1px solid #e0e0e0;
}

.topic-list li:last-child {
    border-bottom: none;
}

.topic-list li:before {
    content: "▸";
    color: #204198;
    font-weight: bold;
    position: absolute;
    left: 0;
}

.paper-categories {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
    margin-top: 20px;
}

.category-item {
    background: #fff;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.category-item h4 {
    margin-top: 0;
}

.action-buttons {
    display: flex;
    gap: 15px;
    margin-top: 20px;
    flex-wrap: wrap;
}

.action-btn {
    display: inline-block;
    padding: 12px 30px;
    background: #204198;
    color: #fff;
    text-decoration: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s;
}

.action-btn:hover {
    background: #2d5bb8;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(32, 65, 152, 0.3);
}

.content-block a {
    color: #204198;
    text-decoration: none;
    font-weight: 600;
    position: relative;
    z-index: 1;
    transition: all 0.3s ease;
    display: inline-block;
}

.content-block a:hover {
    color: #2d5bb8;
    text-decoration: underline;
    transform: translateX(3px);
}

@media (max-width: 768px) {
    .main-content {
        padding: 40px 0;
    }
    
    .main-content::after {
        width: 300px;
        height: 300px;
        top: -30%;
        right: -20%;
    }
    
    .cfp-section {
        padding: 50px 0;
        margin: 0 15px;
        border-radius: 8px;
    }
    
    .content-block {
        padding: 25px;
        border-radius: 8px;
    }
    
    .paper-categories {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: 30px 0;
    }
    
    .cfp-section {
        margin: 0 10px;
        padding: 40px 0;
    }
    
    .content-block {
        padding: 20px;
        margin-bottom: 30px;
    }
    
    .content-block h3 {
        font-size: 20px;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .action-btn {
        width: 100%;
        text-align: center;
    }
}