.file-input-section {
    text-align: center;
    padding: 50px;
    font-family: 'Times New Roman', serif;
}

body {
    font-family: 'Times New Roman', serif;
    line-height: 1.6;
    color: #000;
    background-color: #fff;
    margin: 0;
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.container {
    display: flex;
    gap: 30px;
}

.sidebar {
    flex: 0 0 250px;
    border-right: 1px solid #ccc;
    padding-right: 20px;
}

.sidebar h2 {
    font-size: 16px;
    margin-bottom: 15px;
    font-weight: bold;
}

.tag-controls {
    margin-bottom: 15px;
}

.tag-controls button {
    background: none;
    border: 1px solid #000;
    padding: 4px 8px;
    margin-right: 5px;
    cursor: pointer;
    font-size: 12px;
}

.tag-controls button:hover {
    background: #f0f0f0;
}

.tag-list {
    font-size: 13px;
}

.tag-item {
    margin-bottom: 5px;
}

.tag-item input {
    margin-right: 5px;
}

.tag-item label {
    cursor: pointer;
}

.main-content {
    flex: 1;
}

.main-content h1 {
    font-size: 20px;
    margin-bottom: 20px;
    font-weight: bold;
}

.problem-stats {
    font-size: 14px;
    margin-bottom: 20px;
    color: #666;
}

.problem-item {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid #eee;
}

.problem-header h3 {
    font-size: 16px;
    margin-bottom: 5px;
    font-weight: bold;
}

.problem-meta {
    font-size: 11px;
    color: #999;
    margin-bottom: 10px;
    font-style: italic;
}

.filename {
    font-family: monospace;
}

.problem-tags {
    font-size: 12px;
    margin-bottom: 15px;
}

.tag {
    display: inline-block;
    margin-right: 8px;
    color: #666;
}

.tag:before {
    content: "[";
}

.tag:after {
    content: "]";
}

.problem-content {
    font-size: 14px;
    line-height: 1.6;
}

.problem-content p {
    margin-bottom: 10px;
}


@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }
    
    .sidebar {
        flex: none;
        border-right: none;
        border-bottom: 1px solid #ccc;
        padding-right: 0;
        padding-bottom: 20px;
        margin-bottom: 20px;
    }
}