:root {
  --bg-primary: #0a0e17;
  --bg-surface: #111827;
  --bg-surface-elevated: #1e293b;
  --bg-card-hover: #24344d;
  --border-subtle: #1f293d;
  --border-strong: #334155;
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --accent-blue: #3b82f6;
  --accent-blue-hover: #2563eb;
  --accent-cyan: #06b6d4;
  --accent-success: #10b981;
  --accent-danger: #ef4444;
  --accent-warning: #f59e0b;

  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-family);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 2.5rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.875rem;
}

.brand-icon {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-subtitle {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.875rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: rgba(16, 185, 129, 0.1);
  color: var(--accent-success);
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.status-badge.offline {
  background: rgba(239, 68, 68, 0.1);
  color: var(--accent-danger);
  border-color: rgba(239, 68, 68, 0.25);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: currentColor;
  box-shadow: 0 0 8px currentColor;
}

/* Hero Section */
.hero-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}

.hero-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
}

.hero-main {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.hero-info h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.35rem;
}

.hero-host-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hero-host {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.08);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(6, 182, 212, 0.2);
}

.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s ease-in-out;
}

.btn-primary {
  background-color: var(--accent-blue);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--accent-blue-hover);
}

.btn-secondary {
  background-color: var(--bg-surface-elevated);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.btn-secondary:hover {
  background-color: var(--bg-card-hover);
}

/* Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.metric-item {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.metric-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

.metric-value {
  font-size: 1.5rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.metric-sub {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
}

/* Grid Layout for Content */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

@media (max-width: 820px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}

.panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.panel-title {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

/* Details Table */
.spec-list {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.spec-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
}

.spec-key {
  color: var(--text-secondary);
}

.spec-val {
  font-family: var(--font-mono);
  color: var(--text-primary);
  font-weight: 500;
}

/* Channel Tree */
.tree-container {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem;
  max-height: 280px;
  overflow-y: auto;
}

.channel-item {
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.02);
  margin-bottom: 0.5rem;
  border: 1px solid var(--border-subtle);
}

.channel-item:last-child {
  margin-bottom: 0;
}

.channel-name {
  font-size: 0.875rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.user-list {
  margin-top: 0.5rem;
  margin-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.user-item {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.user-item::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-success);
}

.empty-tree {
  color: var(--text-muted);
  font-size: 0.8125rem;
  text-align: center;
  padding: 1.5rem 0;
}

/* Client Setup Guide */
.guide-steps {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.guide-step {
  display: flex;
  gap: 0.875rem;
}

.step-number {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
  color: var(--accent-cyan);
}

.step-text {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.step-text strong {
  color: var(--text-primary);
}

.step-text code {
  font-family: var(--font-mono);
  background: var(--bg-surface-elevated);
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  color: var(--accent-cyan);
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  box-shadow: 0 10px 25px rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.2s ease-in-out;
  pointer-events: none;
  z-index: 100;
}

.toast.show {
  transform: translateY(0);
  opacity: 1;
}

/* Footer */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--border-subtle);
  padding: 1.5rem 0;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
}