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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

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

header {
    text-align: center;
    color: white;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 5px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

header .subtitle {
    font-size: 1.1em;
    opacity: 0.9;
}

/* Config Section */
.config-section {
    background: white;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 30px;
    display: flex;
    gap: 10px;
    align-items: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.error-banner {
    background: #ffebee;
    border-left: 4px solid #f44336;
    color: #c62828;
    padding: 15px 20px;
    border-radius: 5px;
    margin-bottom: 20px;
    display: none;
    font-weight: 500;
}

.config-section label {
    font-weight: 600;
    min-width: 100px;
}

.config-section input {
    flex: 1;
    padding: 10px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 5px;
    font-size: 1em;
    transition: border-color 0.3s;
}

.config-section input:focus {
    outline: none;
    border-color: #667eea;
}

.config-section button {
    padding: 10px 25px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 5px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

.config-section button:hover {
    background: #5568d3;
}

.status-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    animation: pulse 2s infinite;
}

.status-dot.online {
    background: #4caf50;
}

.status-dot.offline {
    background: #f44336;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Stats Section */
.stats-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.stat-box {
    background: white;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.stat-label {
    font-size: 0.9em;
    color: #999;
    margin-bottom: 10px;
    font-weight: 500;
}

.stat-value {
    font-size: 2.5em;
    font-weight: bold;
    color: #667eea;
}

/* Nodes Section */
.nodes-section {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.nodes-section h2 {
    margin-bottom: 20px;
    color: #333;
}

.nodes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 40px;
    color: #999;
    font-size: 1.1em;
}

/* Node Card */
.node-card {
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    padding: 20px;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.node-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: #4caf50;
}

.node-card.offline::before {
    background: #f44336;
}

.node-card.offline {
    opacity: 0.7;
    border-color: #ffcdd2;
}

.node-card:hover {
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    transform: translateY(-2px);
}

.node-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 15px;
}

.node-hostname {
    font-weight: 700;
    font-size: 1.2em;
    color: #333;
    word-break: break-word;
}

.node-status-badge {
    display: inline-block;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: #4caf50;
    position: relative;
}

.node-status-badge.offline {
    background: #f44336;
}

.node-status-badge::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 10px;
    height: 10px;
    background: white;
    border-radius: 50%;
}

.node-info {
    margin-bottom: 10px;
}

.node-info-label {
    font-size: 0.85em;
    color: #999;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 3px;
}

.node-info-value {
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.95em;
    color: #333;
    word-break: break-all;
    background: #f5f5f5;
    padding: 8px;
    border-radius: 4px;
}

.node-status-text {
    font-size: 0.9em;
    color: #4caf50;
    font-weight: 600;
}

.node-status-text.offline {
    color: #f44336;
}

.node-timestamp {
    font-size: 0.75em;
    color: #ccc;
    margin-top: 10px;
    text-align: right;
}

/* Responsive */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8em;
    }

    .config-section {
        flex-direction: column;
    }

    .config-section label {
        width: 100%;
    }

    .config-section input,
    .config-section button {
        width: 100%;
    }

    .nodes-grid {
        grid-template-columns: 1fr;
    }
}
