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

        body {
            font-family: 'Microsoft YaHei', Arial, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #333;
        }

        .container {
            background: rgba(255, 255, 255, 0.95);
            border-radius: 20px;
            padding: 30px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
            text-align: center;
            max-width: 1200px;
            width: 95%;
        }

        .header {
            margin-bottom: 20px;
        }

        h1 {
            color: #4a5568;
            margin-bottom: 10px;
            font-size: 2.2em;
            font-weight: 300;
        }

        .subtitle {
            color: #718096;
            font-size: 0.9em;
            margin-bottom: 20px;
        }

        .ad-banner {
            background: linear-gradient(135deg, #ff6b6b 0%, #ee5a24 100%);
            color: white;
            padding: 15px;
            border-radius: 10px;
            margin-bottom: 20px;
            box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
        }

        .ad-banner h3 {
            font-size: 1.1em;
            margin-bottom: 8px;
        }

        .ad-banner p {
            font-size: 0.9em;
            margin: 5px 0;
        }

        .ad-banner .website {
            font-weight: bold;
            background: rgba(255, 255, 255, 0.2);
            padding: 4px 8px;
            border-radius: 5px;
            display: inline-block;
            margin: 5px;
        }

        .node-selector {
            background: #f7fafc;
            padding: 15px;
            border-radius: 10px;
            margin-bottom: 20px;
            border: 2px solid #e2e8f0;
        }

        .node-selector h3 {
            color: #4a5568;
            margin-bottom: 10px;
            font-size: 1.1em;
        }

        .node-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
        }

        .node-btn {
            background: #667eea;
            color: white;
            border: none;
            padding: 8px 15px;
            border-radius: 20px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-size: 0.9em;
        }

        .node-btn:hover {
            background: #5a67d8;
            transform: translateY(-1px);
        }

        .node-btn.active {
            background: #48bb78;
        }

        .test-config {
            background: #f7fafc;
            padding: 15px;
            border-radius: 10px;
            margin-bottom: 20px;
            border: 2px solid #e2e8f0;
        }

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

        .config-row label {
            color: #4a5568;
            font-weight: 500;
        }

        .config-row input, .config-row select {
            padding: 5px 10px;
            border: 1px solid #e2e8f0;
            border-radius: 5px;
            font-size: 0.9em;
        }

        .speed-display {
            background: #f7fafc;
            border-radius: 15px;
            padding: 25px;
            margin: 20px 0;
            border: 2px solid #e2e8f0;
        }

        .speed-value {
            font-size: 2.5em;
            font-weight: bold;
            color: #2d3748;
            margin-bottom: 5px;
        }

        .speed-unit {
            font-size: 1em;
            color: #718096;
        }

        .test-button {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            padding: 12px 30px;
            font-size: 1em;
            border-radius: 25px;
            cursor: pointer;
            transition: all 0.3s ease;
            margin: 8px;
            min-width: 120px;
        }

        .test-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
        }

        .test-button:disabled {
            background: #cbd5e0;
            cursor: not-allowed;
            transform: none;
        }

        .progress-bar {
            width: 100%;
            height: 6px;
            background: #e2e8f0;
            border-radius: 3px;
            margin: 15px 0;
            overflow: hidden;
        }

        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, #667eea, #764ba2);
            width: 0%;
            transition: width 0.3s ease;
        }

        .status {
            margin: 15px 0;
            font-size: 1em;
            color: #4a5568;
        }

        .results {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 25px;
            margin-top: 25px;
        }

        .result-item {
            background: #f7fafc;
            padding: 20px;
            border-radius: 12px;
            border: 1px solid #e2e8f0;
            transition: transform 0.2s ease;
        }

        .result-item:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }

        .result-label {
            font-size: 0.85em;
            color: #718096;
            margin-bottom: 8px;
            font-weight: 500;
        }

        .result-value {
            font-size: 1.4em;
            font-weight: bold;
            color: #2d3748;
        }

        .hidden {
            display: none;
        }

        .test-history {
            background: #f7fafc;
            padding: 15px;
            border-radius: 10px;
            margin-top: 20px;
            max-height: 200px;
            overflow-y: auto;
        }

        .history-item {
            display: flex;
            justify-content: space-between;
            padding: 5px 0;
            border-bottom: 1px solid #e2e8f0;
            font-size: 0.9em;
        }

        @media (max-width: 600px) {
            .container {
                padding: 20px;
            }
            
            .config-row {
                flex-direction: column;
                align-items: flex-start;
                gap: 5px;
            }
            
            .node-buttons {
                justify-content: center;
            }
        }