* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background: #2c3e50;
    color: white;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
}

header h1 {
    margin-bottom: 15px;
}

.status-bar {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.status-indicator {
    padding: 5px 10px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    font-size: 0.9em;
}

.status-indicator.connected {
    background: #27ae60;
}

.status-indicator.disconnected {
    background: #e74c3c;
}

.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    border-bottom: 2px solid #ddd;
}

.tab-button {
    padding: 12px 24px;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    cursor: pointer;
    font-size: 16px;
    color: #666;
    transition: all 0.3s;
}

.tab-button:hover {
    color: #2c3e50;
    background: #f0f0f0;
}

.tab-button.active {
    color: #2c3e50;
    border-bottom-color: #3498db;
    font-weight: bold;
}

.tab-content {
    display: none;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.tab-content.active {
    display: block;
}

.section {
    margin-bottom: 30px;
}

.section h2 {
    margin-bottom: 15px;
    color: #2c3e50;
    border-bottom: 2px solid #ecf0f1;
    padding-bottom: 10px;
}

.section h3 {
    margin-top: 20px;
    margin-bottom: 10px;
    color: #34495e;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: #555;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    font-family: inherit;
}

.form-group textarea {
    resize: vertical;
    font-family: 'Courier New', monospace;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
    margin-right: 10px;
    margin-bottom: 10px;
}

.btn-primary {
    background: #3498db;
    color: white;
}

.btn-primary:hover {
    background: #2980b9;
}

.btn-secondary {
    background: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background: #7f8c8d;
}

.btn-small {
    padding: 5px 10px;
    font-size: 12px;
}

.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 15px;
}

.response-section {
    margin-top: 20px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 4px;
}

.response-section pre {
    background: #2c3e50;
    color: #ecf0f1;
    padding: 15px;
    border-radius: 4px;
    overflow-x: auto;
    font-size: 13px;
    max-height: 400px;
    overflow-y: auto;
}

.quick-actions {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid #ddd;
}

.messages-section {
    margin-top: 30px;
}

.messages-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.messages-container {
    background: #2c3e50;
    color: #ecf0f1;
    padding: 15px;
    border-radius: 4px;
    max-height: 500px;
    overflow-y: auto;
    font-family: 'Courier New', monospace;
    font-size: 12px;
}

.message-item {
    padding: 8px;
    margin-bottom: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    border-left: 3px solid #3498db;
}

.message-item .timestamp {
    color: #95a5a6;
    font-size: 11px;
    margin-bottom: 4px;
}

.message-item .topic {
    color: #3498db;
    font-weight: bold;
    margin-bottom: 4px;
}

.message-item .payload {
    color: #ecf0f1;
    word-break: break-all;
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    .tabs {
        flex-wrap: wrap;
    }

    .tab-button {
        flex: 1;
        min-width: 100px;
    }

    .button-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        margin-right: 0;
    }
}