:root {
  --bg: #0f172a;
  --bg-card: #1e293b;
  --bg-input: #0b1220;
  --border: #334155;
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --accent: #38bdf8;
  --accent-hover: #0ea5e9;
  --good: #4ade80;
  --warn: #fbbf24;
  --bad: #f87171;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-card);
  position: sticky;
  top: 0;
  z-index: 10;
  padding-top: max(1rem, env(safe-area-inset-top));
}

header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.25rem;
  letter-spacing: 0.5px;
}

.sub {
  color: var(--text-dim);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

#refresh {
  margin-left: auto;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 1rem;
  padding-bottom: max(1rem, env(safe-area-inset-bottom));
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  margin-bottom: 1rem;
}

.card h2 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.5rem 1rem;
}

.kv {
  display: flex;
  flex-direction: column;
  padding: 0.45rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  min-width: 0;
}

.kv.full { grid-column: 1 / -1; }

.kv span {
  color: var(--text-dim);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.kv b {
  font-family: var(--mono);
  font-weight: 500;
  word-break: break-all;
  color: var(--text);
}

button, input, select {
  font: inherit;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text);
  padding: 0.5rem 0.75rem;
}

button {
  background: var(--accent);
  border-color: var(--accent);
  color: #0b1220;
  cursor: pointer;
  font-weight: 600;
  transition: background 0.15s;
}

button:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
button:active { transform: translateY(1px); }
button.mini {
  margin-left: auto;
  padding: 0.25rem 0.6rem;
  font-size: 0.8rem;
}

input, select {
  flex: 1;
  min-width: 0;
}

.row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.row input { flex: 2 1 200px; }
.row select { flex: 0 1 90px; }
.row button { flex: 0 0 auto; }

.hint {
  color: var(--text-dim);
  font-size: 0.8rem;
  margin: 0.5rem 0 0;
}

.out {
  font-family: var(--mono);
  font-size: 0.85rem;
  background: var(--bg-input);
  padding: 0.75rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  overflow-x: auto;
  margin: 0;
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 300px;
  overflow-y: auto;
}

.ping-table, .ref {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 0.85rem;
}

.ping-table th, .ping-table td,
.ref th, .ref td {
  text-align: left;
  padding: 0.4rem 0.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.ping-table th, .ref th {
  color: var(--text-dim);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
}

.ping-result.good { color: var(--good); }
.ping-result.warn { color: var(--warn); }
.ping-result.bad  { color: var(--bad); }
.ping-result.pending { color: var(--text-dim); }

details {
  margin: 0.5rem 0;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem 0.75rem;
  background: var(--bg-input);
}

details summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--accent);
  list-style: none;
  padding: 0.25rem 0;
}

details summary::-webkit-details-marker { display: none; }
details summary::before {
  content: "▸ ";
  display: inline-block;
  transition: transform 0.15s;
}
details[open] summary::before { content: "▾ "; }

details[open] { padding-bottom: 0.75rem; }

footer {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.8rem;
  padding: 1rem 0;
}

@media (max-width: 480px) {
  header { padding: 0.75rem 1rem; }
  main { padding: 0.75rem; }
  .card { padding: 0.85rem 0.9rem; }
  .grid { grid-template-columns: 1fr; }
  #refresh { width: 100%; margin-top: 0.5rem; margin-left: 0; }
}