/* ===================================
   CSS Variables
   =================================== */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #16161f;
    --bg-card-hover: #1a1a25;
    
    --border-color: #2a2a3a;
    
    --text-primary: #f0f0f5;
    --text-secondary: #8888a0;
    --text-muted: #55556a;
    
    --accent-cyan: #00d9ff;
    --accent-green: #10b981;
    --accent-amber: #f59e0b;
    --accent-red: #ef4444;
    --accent-purple: #8b5cf6;
    
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 30px rgba(0, 217, 255, 0.15);
    
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
    
    --font-display: 'Space Grotesk', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

/* ===================================
   Reset & Base
   =================================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
}

body {
    font-family: var(--font-mono);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
}

/* ===================================
   Background Grid
   =================================== */
.bg-grid {
    position: fixed;
    inset: 0;
    background-image: 
        linear-gradient(rgba(0, 217, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 217, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: 0;
}

.bg-grid::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(0, 217, 255, 0.08) 0%, transparent 60%);
}

/* ===================================
   Container
   =================================== */
.container {
    position: relative;
    z-index: 1;
    max-width: 1400px;
    margin: 0 auto;
    padding: 24px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* ===================================
   Header
   =================================== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(0, 217, 255, 0.1), rgba(0, 255, 136, 0.1));
    border: 1px solid rgba(0, 217, 255, 0.3);
    border-radius: var(--radius-md);
    color: var(--accent-cyan);
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
}

.logo-subtitle {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 24px;
}

.connection-status {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-amber);
    animation: pulse-dot 2s ease-in-out infinite;
}

.connection-status.connected .status-dot {
    background: var(--accent-green);
    animation: none;
}

.connection-status.disconnected .status-dot {
    background: var(--accent-red);
    animation: none;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(0.8); }
}

.status-text {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.timestamp {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--accent-cyan);
    padding: 8px 16px;
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid rgba(0, 217, 255, 0.2);
    border-radius: var(--radius-md);
}

/* ===================================
   Server Info
   =================================== */
.server-info {
    display: flex;
    gap: 32px;
    padding: 16px 24px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
}

.server-id, .server-endpoint {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.server-info .label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.server-info .value {
    color: var(--text-secondary);
}

/* ===================================
   Stats Grid
   =================================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    flex: 1;
}

/* ===================================
   Stat Card Base
   =================================== */
.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    display: flex;
    flex-direction: column;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(135deg, #00d9ff 0%, #00ff88 100%);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.stat-card:hover {
    background: var(--bg-card-hover);
    border-color: rgba(0, 217, 255, 0.3);
    box-shadow: var(--shadow-glow);
    transform: translateY(-2px);
}

.stat-card:hover::before {
    opacity: 1;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.card-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--accent-cyan);
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid rgba(0, 217, 255, 0.2);
}

.card-label {
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.card-footer {
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Status Colors */
.stat-good { color: var(--accent-green); }
.stat-warn { color: var(--accent-amber); }
.stat-bad { color: var(--accent-red); }
.stat-info { color: var(--text-muted); }

/* ===================================
   Ping Card
   =================================== */
.ping-card .card-icon {
    background: rgba(0, 217, 255, 0.1);
    border-color: rgba(0, 217, 255, 0.2);
    color: var(--accent-cyan);
}

.metric-value {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.metric-value .value {
    font-size: 3rem;
    font-weight: 700;
    font-family: var(--font-display);
    line-height: 1;
    color: var(--text-primary);
}

.metric-value .unit {
    font-size: 1rem;
    color: var(--text-secondary);
}

.ping-bars {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    height: 40px;
    margin-top: 16px;
}

.ping-bars .bar {
    flex: 1;
    background: var(--border-color);
    border-radius: 2px;
    transition: all var(--transition-fast);
    min-height: 4px;
}

.ping-bars .bar.active {
    background: var(--accent-cyan);
}

.ping-bars .bar.warning {
    background: var(--accent-amber);
}

.ping-bars .bar.danger {
    background: var(--accent-red);
}

/* ===================================
   Uptime Card
   =================================== */
.uptime-card .card-icon {
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.2);
    color: var(--accent-green);
}

.uptime-display {
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.uptime-block {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.uptime-value {
    font-size: 1.75rem;
    font-weight: 600;
    font-family: var(--font-display);
    color: var(--text-primary);
    line-height: 1;
}

.uptime-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-top: 4px;
}

.uptime-separator {
    font-size: 1.5rem;
    color: var(--text-muted);
    padding-top: 4px;
}

.uptime-percentage {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 16px;
    padding: 12px;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    border-radius: var(--radius-sm);
}

.percentage-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.percentage-value {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-green);
}

/* ===================================
   CPU Card
   =================================== */
.cpu-card .card-icon {
    background: rgba(139, 92, 246, 0.1);
    border-color: rgba(139, 92, 246, 0.2);
    color: var(--accent-purple);
}

.gauge-container {
    position: relative;
    width: 100%;
    max-width: 200px;
    margin: 0 auto;
}

.gauge {
    width: 100%;
    height: auto;
}

.gauge-bg {
    fill: none;
    stroke: var(--border-color);
    stroke-width: 12;
    stroke-linecap: round;
}

.gauge-fill {
    fill: none;
    stroke-width: 12;
    stroke-linecap: round;
    transition: stroke-dasharray var(--transition-slow);
    filter: drop-shadow(0 0 6px rgba(0, 217, 255, 0.5));
}

.gauge-value {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: baseline;
    gap: 2px;
}

.gauge-value .value {
    font-size: 2.5rem;
    font-weight: 700;
    font-family: var(--font-display);
    color: var(--text-primary);
    line-height: 1;
}

.gauge-value .unit {
    font-size: 1rem;
    color: var(--text-secondary);
}

.cpu-cores {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 12px;
    font-size: 0.8rem;
}

.cores-label {
    color: var(--text-muted);
}

.cores-value {
    color: var(--accent-purple);
    font-weight: 500;
}

/* ===================================
   Memory Card
   =================================== */
.memory-card .card-icon {
    background: rgba(245, 158, 11, 0.1);
    border-color: rgba(245, 158, 11, 0.2);
    color: var(--accent-amber);
}

.memory-bar-container {
    margin-bottom: 16px;
}

.memory-bar {
    height: 24px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    display: flex;
    overflow: hidden;
}

.memory-used {
    background: linear-gradient(90deg, #f59e0b, #f97316);
    transition: width var(--transition-slow);
}

.memory-cached {
    background: rgba(245, 158, 11, 0.3);
    transition: width var(--transition-slow);
}

.memory-legend {
    display: flex;
    justify-content: space-between;
    margin-top: 8px;
    font-size: 0.7rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--text-muted);
}

.legend-item .dot {
    width: 8px;
    height: 8px;
    border-radius: 2px;
}

.legend-item.used .dot { background: #f59e0b; }
.legend-item.cached .dot { background: rgba(245, 158, 11, 0.3); }
.legend-item.free .dot { background: var(--border-color); }

.memory-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.mem-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

.mem-stat.highlight {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.mem-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.mem-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 4px;
}

.mem-stat.highlight .mem-value {
    color: var(--accent-amber);
}

/* ===================================
   Disk Card
   =================================== */
.disk-card .card-icon {
    background: rgba(0, 255, 136, 0.1);
    border-color: rgba(0, 255, 136, 0.2);
    color: #00ff88;
}

.disk-visualization {
    display: flex;
    justify-content: center;
    margin-bottom: 16px;
}

.disk-ring {
    position: relative;
    width: 120px;
    height: 120px;
}

.disk-ring svg {
    transform: rotate(-90deg);
}

.ring-bg {
    fill: none;
    stroke: var(--border-color);
    stroke-width: 10;
}

.ring-fill {
    fill: none;
    stroke: #00ff88;
    stroke-width: 10;
    stroke-linecap: round;
    transition: stroke-dasharray var(--transition-slow);
    filter: drop-shadow(0 0 8px rgba(0, 255, 136, 0.4));
}

.disk-center {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2px;
}

.disk-value {
    font-size: 1.75rem;
    font-weight: 700;
    font-family: var(--font-display);
    color: var(--text-primary);
}

.disk-unit {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.disk-info {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.disk-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 12px;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

.disk-label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.disk-data {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
}

/* ===================================
   Network Card
   =================================== */
.network-card {
    grid-column: span 2;
}

.network-card .card-icon {
    background: rgba(0, 217, 255, 0.1);
    border-color: rgba(0, 217, 255, 0.2);
}

.network-io {
    display: flex;
    gap: 24px;
    margin-bottom: 16px;
}

.io-row {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    flex: 1;
}

.io-row.upload { color: var(--accent-green); }
.io-row.download { color: var(--accent-cyan); }

.io-label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.io-value {
    margin-left: auto;
    font-size: 0.9rem;
    font-weight: 600;
}

.network-chart {
    height: 100px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

#networkCanvas {
    width: 100%;
    height: 100%;
}

/* ===================================
   Footer
   =================================== */
.footer {
    padding: 16px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.footer-info {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.separator {
    color: var(--border-color);
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.stat-card {
    animation: fadeInUp 0.5s ease-out backwards;
}

.stat-card:nth-child(1) { animation-delay: 0.1s; }
.stat-card:nth-child(2) { animation-delay: 0.15s; }
.stat-card:nth-child(3) { animation-delay: 0.2s; }
.stat-card:nth-child(4) { animation-delay: 0.25s; }
.stat-card:nth-child(5) { animation-delay: 0.3s; }
.stat-card:nth-child(6) { animation-delay: 0.35s; }

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===================================
   Responsive
   =================================== */
@media (max-width: 1200px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .network-card {
        grid-column: span 2;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 16px;
        gap: 16px;
    }
    .header {
        flex-direction: column;
        gap: 16px;
        padding: 16px;
    }
    .header-actions {
        width: 100%;
        justify-content: space-between;
    }
    .server-info {
        flex-direction: column;
        gap: 12px;
    }
    .stats-grid {
        grid-template-columns: 1fr;
    }
    .network-card {
        grid-column: span 1;
    }
    .metric-value .value {
        font-size: 2.5rem;
    }
    .uptime-display {
        flex-wrap: wrap;
        justify-content: center;
    }
    .network-io {
        flex-direction: column;
        gap: 8px;
    }
    .footer-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    .separator {
        display: none;
    }
}