body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f5f5f5;
    line-height: 1.6;
}
.container {
    background-color: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
h1 {
    color: #4285F4;
    text-align: center;
    margin-bottom: 30px;
}
h2 {
    color: #4285F4;
    margin-top: 40px;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}
h3 {
    color: #555;
}
.form-group {
    margin-bottom: 20px;
}
label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #555;
}
input[type="text"], select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
    font-size: 16px;
}
select {
    height: 40px;
}
.operator-group {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
    align-items: center;
}
.operator-group select {
    flex: 1;
}
.operator-group input {
    flex: 2;
}
button {
    background-color: #4285F4;
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    width: 100%;
    margin-top: 10px;
}
button:hover {
    background-color: #3367D6;
}
.copy-btn {
    width: auto;
    margin-top: 10px;
    background-color: #34A853;
}
.copy-btn:hover {
    background-color: #2d9249;
}
.result {
    margin-top: 30px;
    padding: 15px;
    background-color: #f8f9fa;
    border-radius: 4px;
    border-left: 4px solid #4285F4;
}
.query {
    font-family: monospace;
    word-break: break-all;
    margin-bottom: 15px;
    padding: 10px;
    background-color: #fff;
    border: 1px solid #eee;
}
a {
    color: #1a0dab;
    text-decoration: none;
    display: inline-block;
    margin-bottom: 15px;
}
a:hover {
    text-decoration: underline;
}
.operators-info {
    margin-top: 40px;
}
.operator-item {
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid #eee;
}
.operator-item:last-child {
    border-bottom: none;
}
.operator-item h3 {
    color: #EA4335;
    margin-bottom: 5px;
}
.operator-item p {
    margin: 5px 0;
}
code {
    background-color: #f1f3f4;
    padding: 2px 4px;
    border-radius: 3px;
    font-family: monospace;
}
.remove-operator {
    width: auto;
    padding: 0 10px;
    background-color: #EA4335;
}
.remove-operator:hover {
    background-color: #d33426;
}
@media (max-width: 600px) {
    .operator-group {
        flex-direction: column;
    }
    .operator-group select,
    .operator-group input {
        width: 100%;
    }
}