body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-color, #333);
    padding: 20px;
    background-color: #f5f5f5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.header {
    text-align: center;
    margin-bottom: 30px;
}

.header h1 {
    color: #2196F3;
    margin-bottom: 10px;
}

.url-input-section {
    margin-bottom: 10px;
}

.url-input {
    width: 100%;
    min-height: 48px;
    padding: 12px;
    border: 2px solid #BBDEFB;
    border-radius: 4px;
    font-size: 16px;
    resize: none;
    box-sizing: border-box;
    overflow: hidden;
}

.url-input-actions {
    display: flex;
    gap: 12px;
    margin: 10px 0 20px 0;
}
.action-btn {
    padding: 8px 18px;
    border: none;
    border-radius: 4px;
    font-size: 15px;
    cursor: pointer;
    color: #fff;
    background: #2196F3;
    transition: background 0.2s;
}
.action-btn:hover {
    background: #1976D2;
}
.action-btn.clear {
    background: #f44336;
}
.action-btn.clear:hover {
    background: #c62828;
}

.replace-section {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}
.replace-input {
    flex: 1;
    padding: 8px;
    border: 1px solid #BBDEFB;
    border-radius: 4px;
    font-size: 15px;
}

.params-section {
    background: #E3F2FD;
    padding: 20px;
    border-radius: 4px;
    margin-top: 20px;
}

.param-item {
    background: white;
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 4px;
    border: 1px solid #BBDEFB;
    display: flex;
    align-items: center;
    gap: 10px;
}

.param-name {
    min-width: 200px;
    font-weight: bold;
    color: #2196F3;
}

.param-value {
    flex: 1;
    padding: 8px;
    border: 1px solid #BBDEFB;
    border-radius: 4px;
    font-family: monospace;
    min-height: 40px;
    resize: none;
    width: 100%;
    box-sizing: border-box;
    overflow: hidden;
}

.param-actions {
    display: flex;
    gap: 5px;
}

.param-btn {
    padding: 4px 8px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    color: white;
}

.delete-btn {
    background-color: #f44336;
}

.add-btn {
    background-color: #4CAF50;
}

.add-param-section {
    margin-top: 20px;
    padding: 15px;
    background: white;
    border-radius: 4px;
    border: 1px solid #BBDEFB;
}

.add-param-form {
    display: flex;
    gap: 10px;
    align-items: center;
}

.add-param-input {
    flex: 1;
    padding: 8px;
    border: 1px solid #BBDEFB;
    border-radius: 4px;
}