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

:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-card: #1a2332;
    --bg-card-hover: #1f2937;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-blue: #3b82f6;
    --accent-green: #22c55e;
    --accent-purple: #8b5cf6;
    --accent-orange: #f97316;
    --accent-pink: #ec4899;
    --accent-cyan: #06b6d4;
    --accent-red: #ef4444;
    --accent-yellow: #eab308;
    --border-color: #1e293b;
    --border-light: #334155;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

.dashboard {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    border-bottom: 1px solid var(--border-color);
}

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

.header-logo {
    height: 42px;
    width: auto;
}

.header-title h1 {
    font-size: 1.5rem;
    font-weight: 600;
    background: linear-gradient(135deg, #fff 0%, var(--accent-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-subtitle {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

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

.connection-status {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-card);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    font-size: 0.875rem;
}

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

@keyframes pulse {
    0%, 100% { opacity: 1; box-shadow: 0 0 0 0 currentColor; }
    50% { opacity: 0.7; box-shadow: 0 0 0 4px transparent; }
}

.header-time {
    text-align: right;
}

.header-time #current-time {
    display: block;
    font-size: 1.25rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.header-time #current-date {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 20px 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Metrics Row */
.metrics-row {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
}

.metric-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 20px;
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.metric-card:hover {
    border-color: var(--border-light);
    transform: translateY(-2px);
}

.metric-card.highlight {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border-color: var(--accent-blue);
}

.metric-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.metric-icon {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

.metric-icon svg {
    width: 20px;
    height: 20px;
}

.metric-icon.download { background: rgba(59, 130, 246, 0.15); color: var(--accent-blue); }
.metric-icon.upload { background: rgba(139, 92, 246, 0.15); color: var(--accent-purple); }
.metric-icon.latency { background: rgba(34, 197, 94, 0.15); color: var(--accent-green); }
.metric-icon.packets { background: rgba(249, 115, 22, 0.15); color: var(--accent-orange); }
.metric-icon.tunnels { background: rgba(6, 182, 212, 0.15); color: var(--accent-cyan); }

.metric-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.metric-value-container {
    display: flex;
    align-items: baseline;
    gap: 6px;
}

.metric-value {
    font-size: 2rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}

.metric-unit {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: 20px;
}

/* Panels */
.panel {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.2);
}

.panel-title {
    display: flex;
    align-items: center;
    gap: 10px;
}

.panel-title svg {
    width: 20px;
    height: 20px;
    color: var(--accent-blue);
}

.panel-title h2 {
    font-size: 0.95rem;
    font-weight: 600;
}

.panel-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.panel-badge {
    font-size: 0.7rem;
    padding: 4px 10px;
    background: rgba(34, 197, 94, 0.15);
    color: var(--accent-green);
    border-radius: 12px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.panel-badge.warning {
    background: rgba(234, 179, 8, 0.15);
    color: var(--accent-yellow);
}

.panel-badge.danger {
    background: rgba(239, 68, 68, 0.15);
    color: var(--accent-red);
}

/* Traffic Panel */
.traffic-panel .chart-container {
    height: 280px;
    padding: 16px 20px;
}

.interface-stats {
    display: flex;
    justify-content: space-around;
    padding: 12px 20px;
    border-top: 1px solid var(--border-color);
    background: rgba(0, 0, 0, 0.15);
}

.interface-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.interface-name {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.interface-value {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* VPN Panel */
.vpn-tunnels-grid {
    padding: 16px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

.vpn-tunnel {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.vpn-tunnel:hover {
    border-color: var(--border-light);
}

.vpn-tunnel-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.vpn-tunnel-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(34, 197, 94, 0.1);
}

.vpn-tunnel-icon svg {
    width: 20px;
    height: 20px;
    color: var(--accent-green);
}

.vpn-tunnel-icon.down {
    background: rgba(239, 68, 68, 0.1);
}

.vpn-tunnel-icon.down svg {
    color: var(--accent-red);
}

.vpn-tunnel-details h3 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.vpn-tunnel-details span {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.vpn-tunnel-status {
    display: flex;
    align-items: center;
    gap: 8px;
}

.status-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent-green);
}

.status-indicator.down {
    background: var(--accent-red);
}

.status-indicator.unknown {
    background: var(--text-muted);
}

.status-text {
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
}

.status-text.up { color: var(--accent-green); }
.status-text.down { color: var(--accent-red); }
.status-text.unknown { color: var(--text-muted); }

/* Bottom Grid */
.bottom-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 20px;
}

/* Interfaces Panel */
.interfaces-list {
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.interface-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.interface-item-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.interface-item-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-green);
}

.interface-item-name {
    font-weight: 500;
    font-size: 0.875rem;
}

.interface-item-speed {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.interface-item-traffic {
    text-align: right;
}

.interface-item-traffic .down {
    color: var(--accent-blue);
    font-size: 0.8rem;
}

.interface-item-traffic .up {
    color: var(--accent-purple);
    font-size: 0.8rem;
}

/* Gauge Panel */
.gauge-container {
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.gauge {
    position: relative;
    width: 180px;
    height: 100px;
}

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

.gauge-bg {
    fill: none;
    stroke: var(--bg-secondary);
    stroke-width: 14;
    stroke-linecap: round;
}

.gauge-fill {
    fill: none;
    stroke: url(#gauge-gradient);
    stroke-width: 14;
    stroke-linecap: round;
    stroke-dasharray: 251;
    stroke-dashoffset: 251;
    transition: stroke-dashoffset 0.5s ease;
}

.gauge-value {
    position: absolute;
    bottom: 5px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
}

.gauge-value span:first-child {
    font-size: 2.5rem;
    font-weight: 700;
}

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

.gauge-stats {
    display: flex;
    gap: 40px;
    margin-top: 16px;
}

.gauge-stat {
    text-align: center;
}

.gauge-stat .stat-value {
    display: block;
    font-size: 1.25rem;
    font-weight: 600;
}

.gauge-stat .stat-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

/* System Panel */
.system-info {
    padding: 16px;
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

.info-row:last-child {
    border-bottom: none;
}

.info-label {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.info-value {
    font-weight: 500;
    font-size: 0.85rem;
}

/* Fullscreen Button */
.fullscreen-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 6px;
    cursor: pointer;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.fullscreen-btn:hover {
    background: var(--accent-blue);
    color: white;
    border-color: var(--accent-blue);
}

.fullscreen-btn svg {
    width: 16px;
    height: 16px;
}

.fullscreen-btn .compress-icon {
    display: none;
}

.panel.fullscreen .fullscreen-btn .expand-icon {
    display: none;
}

.panel.fullscreen .fullscreen-btn .compress-icon {
    display: block;
}

.panel.fullscreen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100vw;
    height: 100vh;
    z-index: 9999;
    border-radius: 0;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
}

.panel.fullscreen .chart-container {
    flex: 1;
    height: auto;
}

.panel.fullscreen .interface-stats {
    flex-shrink: 0;
}

/* Footer */
.footer {
    display: flex;
    justify-content: space-between;
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.75rem;
}

/* Responsive */
@media (max-width: 1400px) {
    .metrics-row {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
    
    .bottom-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 900px) {
    .metrics-row {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .bottom-grid {
        grid-template-columns: 1fr;
    }
    
    .header {
        flex-direction: column;
        gap: 16px;
    }
    
    .header-right {
        width: 100%;
        justify-content: space-between;
    }
}

@media (max-width: 600px) {
    .metrics-row {
        grid-template-columns: 1fr;
    }
    
    .main-content {
        padding: 12px;
    }
}