:root {
  --bg: #0f1420;
  --panel: #171d2c;
  --border: #2a3348;
  --text: #e6e9f0;
  --muted: #8b94a8;
  --accent: #4f8cff;
  --danger: #e5484d;
  --ok: #2fbf71;
  --warn: #e0a13a;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); }
#app { display: flex; min-height: 100vh; }
.sidebar {
  width: 220px; background: var(--panel); border-right: 1px solid var(--border);
  padding: 16px 0; flex-shrink: 0;
}
.sidebar .brand { font-weight: 700; font-size: 1.1rem; padding: 0 16px 16px; }
.sidebar nav a {
  display: block; padding: 10px 16px; color: var(--muted); text-decoration: none; cursor: pointer;
  border-left: 3px solid transparent;
}
.sidebar nav a:hover { color: var(--text); background: #1d2436; }
.sidebar nav a.active { color: var(--text); border-left-color: var(--accent); background: #1d2436; }
main { flex: 1; padding: 24px 32px; max-width: 980px; }
h1 { font-size: 1.4rem; margin-top: 0; }
h2 { font-size: 1.1rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; margin-top: 28px; }
table { width: 100%; border-collapse: collapse; margin: 12px 0; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); font-size: .92rem; }
th { color: var(--muted); font-weight: 600; }
.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: .78rem; }
.badge.online { background: rgba(47,191,113,.15); color: var(--ok); }
.badge.offline { background: rgba(229,72,77,.15); color: var(--danger); }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 20px; margin-bottom: 20px; }
label { display: block; font-size: .85rem; color: var(--muted); margin: 10px 0 4px; }
input, select, textarea {
  width: 100%; padding: 8px 10px; border-radius: 6px; border: 1px solid var(--border);
  background: #10151f; color: var(--text); font-size: .92rem;
}
textarea { font-family: monospace; min-height: 90px; }
button {
  margin-top: 14px; padding: 8px 16px; border-radius: 6px; border: 1px solid var(--accent);
  background: var(--accent); color: white; font-weight: 600; cursor: pointer; font-size: .9rem;
}
button.secondary { background: transparent; color: var(--text); border-color: var(--border); }
button.danger { background: var(--danger); border-color: var(--danger); }
button:disabled { opacity: .5; cursor: not-allowed; }
.msg { padding: 10px 12px; border-radius: 6px; margin: 10px 0; font-size: .9rem; }
.msg.error { background: rgba(229,72,77,.12); color: var(--danger); border: 1px solid rgba(229,72,77,.3); }
.msg.ok { background: rgba(47,191,113,.12); color: var(--ok); border: 1px solid rgba(47,191,113,.3); }
.empty { color: var(--muted); font-style: italic; padding: 20px 0; }
.stat-row { display: flex; gap: 16px; flex-wrap: wrap; }
.stat { background: var(--panel); border: 1px solid var(--border); border-radius: 10px; padding: 16px 20px; min-width: 140px; }
.stat .n { font-size: 1.6rem; font-weight: 700; }
.stat .label { color: var(--muted); font-size: .82rem; }
.center-screen { display: flex; align-items: center; justify-content: center; width: 100%; min-height: 100vh; }
.center-screen .card { width: 380px; }
code { background: #10151f; padding: 2px 6px; border-radius: 4px; }