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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: #0f172a;
    color: #e2e8f0;
    min-height: 100vh;
}

header {
    background: #1e293b;
    border-bottom: 1px solid #334155;
    padding: 20px 32px;
    display: flex;
    align-items: baseline;
    gap: 16px;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #f1f5f9;
}

.subtitle {
    font-size: 0.8rem;
    color: #64748b;
}

main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 24px;
}

/* --- Group --- */

.group {
    margin-bottom: 32px;
}

.group-header {
    font-size: 1.1rem;
    font-weight: 600;
    color: #3b82f6;
    padding: 8px 0 12px 0;
    border-bottom: 2px solid #1e3a5f;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.server-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 12px;
}

/* --- Server Card --- */

.server-card {
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 10px;
    padding: 16px;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.server-card:hover {
    border-color: #475569;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.server-card.expanded {
    grid-column: 1 / -1;
    border-color: #3b82f6;
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.15);
}

.server-card.offline .card-summary {
    opacity: 0.6;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 4px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.status-dot.online {
    background: #22c55e;
    box-shadow: 0 0 6px rgba(34, 197, 94, 0.5);
}

.status-dot.offline {
    background: #ef4444;
    box-shadow: 0 0 6px rgba(239, 68, 68, 0.5);
}

.server-name {
    font-weight: 600;
    font-size: 0.95rem;
    color: #f1f5f9;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.server-ip {
    font-size: 0.8rem;
    color: #94a3b8;
    margin-bottom: 2px;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

.server-os {
    font-size: 0.75rem;
    color: #64748b;
    margin-bottom: 10px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.offline-label {
    font-size: 0.8rem;
    color: #ef4444;
    font-style: italic;
    margin-top: 8px;
}

/* --- Usage Bars --- */

.usage-bars {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.usage-row {
    display: flex;
    align-items: center;
    gap: 6px;
}

.usage-label {
    font-size: 0.65rem;
    font-weight: 600;
    color: #64748b;
    width: 30px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.usage-bar-bg {
    flex: 1;
    height: 6px;
    background: #334155;
    border-radius: 3px;
    overflow: hidden;
}

.usage-bar-fill {
    height: 100%;
    border-radius: 3px;
    transition: width 0.5s ease;
    min-width: 2px;
}

.usage-pct {
    font-size: 0.7rem;
    color: #94a3b8;
    width: 30px;
    text-align: right;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

/* --- Card Details --- */

.card-details {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid #334155;
}

.details-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 16px;
}

.detail-section {
    background: #0f172a;
    border-radius: 8px;
    padding: 12px;
    border: 1px solid #1e3a5f;
}

.detail-section.wide {
    grid-column: 1 / -1;
}

.detail-section h4 {
    font-size: 0.75rem;
    font-weight: 600;
    color: #3b82f6;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 8px;
}

.detail-section table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8rem;
}

.detail-section td {
    padding: 3px 8px 3px 0;
    vertical-align: top;
}

.detail-section td:first-child {
    color: #64748b;
    white-space: nowrap;
    width: 1%;
}

.detail-section td:last-child {
    color: #cbd5e1;
    word-break: break-all;
}

.table-header td {
    font-weight: 600;
    color: #94a3b8 !important;
    border-bottom: 1px solid #334155;
    padding-bottom: 4px;
    margin-bottom: 4px;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.disk-pct {
    font-weight: 600;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

.error-text {
    color: #ef4444;
    font-size: 0.8rem;
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

.last-updated {
    margin-top: 12px;
    font-size: 0.7rem;
    color: #475569;
    text-align: right;
}

/* --- Empty State --- */

.empty-state {
    text-align: center;
    padding: 80px 24px;
    color: #64748b;
}

.empty-state h2 {
    font-size: 1.2rem;
    margin-bottom: 8px;
    color: #94a3b8;
}

.empty-state code {
    background: #1e293b;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.85rem;
    color: #3b82f6;
}

/* --- Responsive --- */

@media (max-width: 600px) {
    header {
        padding: 16px;
    }

    main {
        padding: 12px;
    }

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

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