:root {
  --bg: #0f1419;
  --card: #1a2332;
  --text: #e7ecf3;
  --muted: #9aa8b8;
  --accent: #5b9fd4;
  --warn: #e0a458;
  --err: #e07171;
  --ok: #6fbf8b;
  --border: #2a3545;
  font-family: "Segoe UI", system-ui, sans-serif;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: #121a24;
}
.brand { font-weight: 650; letter-spacing: 0.02em; }
nav { display: flex; gap: 1rem; align-items: center; }
nav a { color: var(--accent); text-decoration: none; }
main { flex: 1; padding: 1.5rem; max-width: 960px; width: 100%; margin: 0 auto; }
footer { padding: 1rem 1.25rem; color: var(--muted); border-top: 1px solid var(--border); }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
}
.card.narrow { max-width: 420px; margin: 2rem auto; }
label { display: block; margin: 0.75rem 0; }
input {
  display: block;
  width: 100%;
  margin-top: 0.35rem;
  padding: 0.55rem 0.65rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #0f1419;
  color: var(--text);
}
button {
  margin-top: 0.75rem;
  background: var(--accent);
  color: #061018;
  border: 0;
  border-radius: 6px;
  padding: 0.55rem 1rem;
  font-weight: 600;
  cursor: pointer;
}
.inline { display: inline; margin: 0; }
.inline button {
  margin: 0;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
  font-weight: 500;
}
.muted { color: var(--muted); }
.error { color: var(--err); }
.warn { color: var(--warn); }
.ok { color: var(--ok); }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 0.5rem; border-bottom: 1px solid var(--border); vertical-align: top; }
pre.json {
  background: #0f1419;
  padding: 1rem;
  border-radius: 8px;
  overflow: auto;
  font-size: 0.85rem;
}