/**
 * Apple Design System - VPS Probe
 * Grounded in Apple HIG (macOS / iOS) & Liquid Glass Design Specs
 */

:root {
  /* Dynamic System Colors - Dark (Default) */
  --system-bg: #000000;
  --secondary-system-bg: #16181d;
  --tertiary-system-bg: #21252d;
  
  /* Materials & Overlays */
  --liquid-glass-bg: rgba(22, 24, 29, 0.72);
  --liquid-glass-border: rgba(255, 255, 255, 0.09);
  --hairline-border: rgba(255, 255, 255, 0.08);
  --hairline-border-hover: rgba(255, 255, 255, 0.16);
  --hairline-highlight: rgba(255, 255, 255, 0.04);
  
  /* Apple Semantic Labels */
  --label-primary: #f5f5f7;
  --label-secondary: #98989d;
  --label-tertiary: #636366;
  --label-quaternary: #48484a;

  /* Apple System Accents & Status */
  --accent: #0a84ff;
  --accent-subtle: rgba(10, 132, 255, 0.15);
  
  --system-green: #30d158;
  --system-green-subtle: rgba(48, 209, 88, 0.14);
  --system-yellow: #ffd60a;
  --system-yellow-subtle: rgba(255, 214, 10, 0.14);
  --system-red: #ff453a;
  --system-red-subtle: rgba(255, 69, 58, 0.14);
  --system-purple: #bf5af2;

  /* Typography Stacks */
  --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", ui-monospace, Menlo, Monaco, Consolas, monospace;

  /* Radii & Shadows */
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 6px;
  --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.35);
  --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.5);

  /* Animation */
  --ease-apple: cubic-bezier(0.16, 1, 0.3, 1);
}

/* Light Appearance */
@media (prefers-color-scheme: light) {
  :root {
    --system-bg: #f5f5f7;
    --secondary-system-bg: #ffffff;
    --tertiary-system-bg: #e5e5ea;
    
    --liquid-glass-bg: rgba(255, 255, 255, 0.78);
    --liquid-glass-border: rgba(0, 0, 0, 0.08);
    --hairline-border: rgba(0, 0, 0, 0.07);
    --hairline-border-hover: rgba(0, 0, 0, 0.14);
    --hairline-highlight: rgba(0, 0, 0, 0.02);
    
    --label-primary: #1d1d1f;
    --label-secondary: #86868b;
    --label-tertiary: #a1a1a6;
    --label-quaternary: #d1d1d6;

    --accent: #0071e3;
    --accent-subtle: rgba(0, 113, 227, 0.1);
    
    --system-green: #34c759;
    --system-green-subtle: rgba(52, 199, 89, 0.12);
    --system-yellow: #ff9500;
    --system-yellow-subtle: rgba(255, 149, 0, 0.12);
    --system-red: #ff3b30;
    --system-red-subtle: rgba(255, 59, 48, 0.12);
    
    --shadow-subtle: 0 2px 14px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.12);
  }
}

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

body {
  background-color: var(--system-bg);
  color: var(--label-primary);
  font-family: var(--font-system);
  font-size: 13px;
  line-height: 1.45;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.layout {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px 48px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ==========================================================================
   Header & Liquid Glass Navbar
   ========================================================================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  margin: 0 -24px 28px;
  padding: 14px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  background: var(--liquid-glass-bg);
  backdrop-filter: blur(24px) saturate(190%);
  -webkit-backdrop-filter: blur(24px) saturate(190%);
  border-bottom: 1px solid var(--liquid-glass-border);
  transition: all 0.2s var(--ease-apple);
}

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

.logo-dot {
  width: 12px;
  height: 12px;
  background: var(--accent);
  border-radius: 3px;
  box-shadow: 0 0 10px var(--accent-subtle);
}

.brand-text {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.brand-text h1 {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--label-primary);
}

.brand-text .sub {
  font-size: 12px;
  color: var(--label-secondary);
  font-weight: 400;
}

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

/* Cluster Summary Pill */
.summary-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--hairline-highlight);
  border: 1px solid var(--hairline-border);
  padding: 5px 12px;
  border-radius: 980px;
  font-size: 12px;
  font-weight: 500;
  color: var(--label-secondary);
}

.dot-online {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--system-green);
  box-shadow: 0 0 6px var(--system-green);
}

/* macOS-Style Segmented Control */
.view-switch {
  display: flex;
  background: var(--tertiary-system-bg);
  border: 1px solid var(--hairline-border);
  border-radius: 8px;
  padding: 2px;
  gap: 2px;
}

.view-switch .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 26px;
  padding: 0 12px;
  border: none;
  background: transparent;
  color: var(--label-secondary);
  font-family: var(--font-system);
  font-size: 12px;
  font-weight: 500;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease-out;
  user-select: none;
}

.view-switch .btn:hover {
  color: var(--label-primary);
}

.view-switch .btn.active {
  background: var(--secondary-system-bg);
  color: var(--label-primary);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 0.5px 1px rgba(0, 0, 0, 0.08);
}

/* ==========================================================================
   Content Grid & Node Card (Content Layer)
   ========================================================================== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 18px;
}

.node-card {
  background: var(--secondary-system-bg);
  border: 1px solid var(--hairline-border);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: var(--shadow-subtle);
  transition: transform 0.25s var(--ease-apple), border-color 0.25s var(--ease-apple), box-shadow 0.25s var(--ease-apple);
}

.node-card:hover {
  transform: translateY(-1.5px);
  border-color: var(--hairline-border-hover);
  box-shadow: var(--shadow-hover);
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
}

.node-title {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.node-name-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.flag-icon {
  font-size: 15px;
  line-height: 1;
}

.node-name {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--label-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.local-badge {
  font-size: 10px;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 5px;
  background: var(--accent-subtle);
  color: var(--accent);
  border: 1px solid rgba(10, 132, 255, 0.25);
  flex-shrink: 0;
}

.node-meta {
  font-size: 11px;
  color: var(--label-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  font-variant-numeric: tabular-nums;
}

.meta-pill {
  background: var(--hairline-highlight);
  border: 1px solid var(--hairline-border);
  padding: 1px 6px;
  border-radius: 4px;
  color: var(--label-secondary);
  font-weight: 500;
}

/* Status Pill */
.status-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 980px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  flex-shrink: 0;
}

.status-badge.online {
  background: var(--system-green-subtle);
  color: var(--system-green);
  border: 1px solid rgba(48, 209, 88, 0.22);
}

.status-badge.offline {
  background: var(--system-red-subtle);
  color: var(--system-red);
  border: 1px solid rgba(255, 69, 58, 0.22);
}

.status-badge .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* ==========================================================================
   Metrics & Progress Bars (San Francisco Metrics)
   ========================================================================== */
.metrics-bars {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.metric-item {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.metric-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
}

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

.metric-value {
  color: var(--label-primary);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.progress-track {
  height: 5px;
  background: var(--tertiary-system-bg);
  border-radius: 980px;
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  border-radius: 980px;
  transition: width 0.4s var(--ease-apple), background 0.3s ease;
}

.progress-fill.normal {
  background: var(--system-green);
}

.progress-fill.warn {
  background: var(--system-yellow);
}

.progress-fill.danger {
  background: var(--system-red);
}

/* Secondary Stat Widget (Inset Grouped) */
.card-stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  background: var(--hairline-highlight);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  border: 1px solid var(--hairline-border);
}

.stat-box {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-title {
  font-size: 11px;
  font-weight: 500;
  color: var(--label-secondary);
}

.stat-desc {
  font-size: 12px;
  color: var(--label-secondary);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.stat-desc b {
  color: var(--label-primary);
  font-weight: 600;
}

.traffic-in { color: var(--accent) !important; font-weight: 600; }
.traffic-out { color: var(--system-purple) !important; font-weight: 600; }

/* ==========================================================================
   Compact Table View (macOS Table Standard)
   ========================================================================== */
.table-wrapper {
  background: var(--secondary-system-bg);
  border: 1px solid var(--hairline-border);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  box-shadow: var(--shadow-subtle);
}

.probe-table {
  width: 100%;
  min-width: 960px;
  border-collapse: collapse;
  text-align: left;
}

.probe-table th {
  background: var(--tertiary-system-bg);
  padding: 10px 16px;
  font-size: 11px;
  font-weight: 600;
  color: var(--label-secondary);
  border-bottom: 1px solid var(--hairline-border);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.probe-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--hairline-border);
  font-size: 12px;
  vertical-align: middle;
  color: var(--label-primary);
}

.probe-table tr:last-child td {
  border-bottom: none;
}

.probe-table tr:hover td {
  background: var(--hairline-highlight);
}

.col-mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.mini-bar-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 110px;
}

.mini-bar {
  flex: 1;
  height: 5px;
  background: var(--tertiary-system-bg);
  border-radius: 980px;
  overflow: hidden;
}

.mini-bar-fill {
  height: 100%;
  border-radius: 980px;
}

.table-node {
  display: flex;
  flex-direction: column;
}

.table-node .name {
  font-size: 13px;
  font-weight: 600;
  color: var(--label-primary);
}

.table-node .sub {
  font-size: 11px;
  color: var(--label-secondary);
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
  margin-top: auto;
  padding-top: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--label-secondary);
  border-top: 1px solid var(--hairline-border);
}

.update-time {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* Error State */
.error-msg {
  text-align: center;
  padding: 40px;
  color: var(--system-red);
  background: var(--system-red-subtle);
  border: 1px dashed rgba(255, 69, 58, 0.3);
  border-radius: var(--radius-lg);
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 768px) {
  .layout {
    padding: 0 16px 36px;
  }
  
  .navbar {
    margin: 0 -16px 20px;
    padding: 12px 16px;
  }
  
  .brand-text h1 {
    font-size: 16px;
  }
  
  .controls {
    width: 100%;
    justify-content: space-between;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  
  .node-card {
    padding: 16px;
  }
  
  .card-stats-grid {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  
  .footer {
    flex-direction: column;
    gap: 8px;
    text-align: center;
    padding-top: 24px;
  }
}