body {
    font-family: "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    background-color: #f0f2f5;
    color: #333;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
}
.container {
    max-width: 900px;
    margin: 0 auto;
    background: #fff;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}
header {
    text-align: center;
    margin-bottom: 30px;
    border-bottom: 1px solid #eee;
    padding-bottom: 20px;
}
header h1 {
    color: #1a73e8;
    margin: 0 0 10px 0;
}
.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    margin-bottom: 30px;
}
.filter-group {
    flex: 1;
    min-width: 200px;
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
}
.filter-group h3 {
    margin-top: 0;
    font-size: 16px;
    color: #555;
    border-bottom: 2px solid #e9ecef;
    padding-bottom: 8px;
    margin-bottom: 12px;
}
.filter-group label {
    display: block;
    margin-bottom: 8px;
    cursor: pointer;
}
.filter-group label:hover {
    color: #1a73e8;
}
select[multiple] {
    width: 100%;
    padding: 8px;
    border: 1px solid #ced4da;
    border-radius: 4px;
    height: 180px;
}
.actions {
    text-align: center;
    margin-bottom: 25px;
}
button {
    background-color: #1a73e8;
    color: white;
    border: none;
    padding: 12px 30px;
    font-size: 16px;
    font-weight: bold;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s;
    margin: 0 10px;
}
button:hover {
    background-color: #1557b0;
}
#copy-btn {
    background-color: #28a745;
}
#copy-btn:hover {
    background-color: #1e7e34;
}
.result-area h3 {
    font-size: 16px;
    color: #555;
}
.result-area textarea {
    width: 100%;
    box-sizing: border-box;
    padding: 15px;
    border: 1px solid #ced4da;
    border-radius: 6px;
    font-family: Consolas, "Courier New", monospace;
    font-size: 14px;
    background-color: #fafafa;
    color: #333;
    resize: vertical;
}
footer {
    text-align: center;
    margin-top: 30px;
    color: #aaa;
    font-size: 12px;
}