:root {
  --bg: #0a0e17;
  --card: #111827;
  --border: #1e293b;
  --text: #e2e8f0;
  --text-dim: #64748b;
  --accent: #3b82f6;
  --green: #22c55e;
  --red: #ef4444;
  --yellow: #eab308;
  --orange: #f97316;
  --radius: 12px;
  --safe-top: env(safe-area-inset-top, 20px);
  --safe-bottom: env(safe-area-inset-bottom, 20px);
}

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

html {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-text-size-adjust: 100%;
}

body {
  padding-top: var(--safe-top);
  padding-bottom: var(--safe-bottom);
  min-height: 100vh;
  min-height: -webkit-fill-available;
}

.app {
  max-width: 600px;
  margin: 0 auto;
  padding: 0 16px;
}

/* Header */
header {
  padding: 16px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

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

h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.status-badge {
  font-size: 0.75rem;
  padding: 4px 10px;
  border-radius: 20px;
  background: rgba(34, 197, 94, 0.15);
  color: var(--green);
  font-weight: 600;
}

.status-badge.offline {
  background: rgba(239, 68, 68, 0.15);
  color: var(--red);
}

.refresh-btn {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
  -webkit-tap-highlight-color: transparent;
}

.refresh-btn:active { opacity: 0.7; }
.refresh-btn:disabled { opacity: 0.4; }

/* Cards */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}

.card h2 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

/* Result Grid */
.result-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.result-item {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.result-item .label {
  font-size: 0.7rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.result-item .value {
  font-size: 0.9rem;
  font-weight: 600;
  font-family: 'SF Mono', 'Fira Code', monospace;
  word-break: break-all;
}

.result-item .value.ok { color: var(--green); }
.result-item .value.fail { color: var(--red); }
.result-item .value.warn { color: var(--yellow); }
.result-item .value.loading { color: var(--text-dim); }

/* Connectivity specific */
.conn-item {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.conn-item .host {
  font-size: 0.7rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.conn-item .latency {
  font-size: 0.9rem;
  font-weight: 600;
  font-family: 'SF Mono', 'Fira Code', monospace;
}

/* Footer */
.footer {
  text-align: center;
  padding: 16px 0 24px;
  font-size: 0.7rem;
  color: var(--text-dim);
}

/* Spinner */
@keyframes spin { to { transform: rotate(360deg); } }
.spinner {
  display: inline-block;
  width: 12px;
  height: 12px;
  border: 2px solid var(--text-dim);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: middle;
  margin-right: 4px;
}

/* Loading overlay on cards */
.card.loading {
  opacity: 0.5;
  pointer-events: none;
}