:root {
  --bg0: #0f1412;
  --bg1: #17201c;
  --panel: #1d2924;
  --line: #2e3f37;
  --text: #e8f0eb;
  --muted: #9db0a6;
  --accent: #3dba7a;
  --accent-dim: #2a7a52;
  --danger: #e35d5d;
  --warn: #e0b35a;
  --font: "IBM Plex Sans", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(900px 500px at 10% -10%, #1d3a2c 0%, transparent 55%),
    radial-gradient(700px 400px at 100% 0%, #243028 0%, transparent 50%),
    var(--bg0);
}

a { color: var(--accent); }

.app { display: none; min-height: 100vh; }
.app.visible { display: grid; grid-template-columns: 220px 1fr; }

.sidebar {
  background: rgba(15, 20, 18, 0.92);
  border-right: 1px solid var(--line);
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.brand {
  font-weight: 700;
  letter-spacing: 0.04em;
  margin: 0 0 1rem;
  font-size: 1.1rem;
}
.nav-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  text-align: left;
  padding: 0.55rem 0.7rem;
  border-radius: 8px;
  cursor: pointer;
  font: inherit;
}
.nav-btn:hover, .nav-btn.active {
  background: var(--panel);
  color: var(--text);
}

.main { padding: 1.25rem 1.5rem 2rem; }
.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}
h1 { margin: 0; font-size: 1.35rem; font-weight: 650; }
.muted { color: var(--muted); font-size: 0.92rem; }

.panel {
  background: rgba(29, 41, 36, 0.9);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 1rem;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 0.75rem;
}
.stat {
  background: var(--bg1);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.85rem;
}
.stat .n { font-size: 1.6rem; font-weight: 700; }
.stat .l { color: var(--muted); font-size: 0.85rem; }

table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
th, td {
  text-align: left;
  padding: 0.55rem 0.4rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
th { color: var(--muted); font-weight: 600; font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.04em; }
.mono { font-family: var(--mono); font-size: 0.85rem; }

button, .btn {
  appearance: none;
  border: 1px solid var(--accent-dim);
  background: linear-gradient(180deg, var(--accent), var(--accent-dim));
  color: #04140c;
  font: inherit;
  font-weight: 650;
  border-radius: 8px;
  padding: 0.45rem 0.8rem;
  cursor: pointer;
}
button.secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--line);
  font-weight: 500;
}
button.danger {
  background: transparent;
  border-color: #7a3030;
  color: var(--danger);
}
button:disabled { opacity: 0.5; cursor: not-allowed; }

input, textarea, select {
  width: 100%;
  background: var(--bg0);
  border: 1px solid var(--line);
  color: var(--text);
  border-radius: 8px;
  padding: 0.55rem 0.65rem;
  font: inherit;
}
label { display: block; color: var(--muted); font-size: 0.85rem; margin: 0.5rem 0 0.25rem; }
.row { display: flex; gap: 0.6rem; flex-wrap: wrap; align-items: end; }
.row > * { flex: 1; min-width: 140px; }
.err { color: var(--danger); margin: 0.5rem 0; }
.ok { color: var(--accent); margin: 0.5rem 0; }

.login-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1rem;
}
.login-card {
  width: min(400px, 100%);
  background: rgba(29, 41, 36, 0.95);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1.4rem;
}
.login-card h1 { margin-bottom: 0.25rem; }
.hidden { display: none !important; }
.view { display: none; }
.view.active { display: block; }

@media (max-width: 800px) {
  .app.visible { grid-template-columns: 1fr; }
  .sidebar { flex-direction: row; flex-wrap: wrap; align-items: center; }
  .brand { width: 100%; margin-bottom: 0.25rem; }
}

.small { font-size: 0.82rem; }
.devices { display: grid; gap: 0.6rem; margin-bottom: 1rem; }
.device {
  background: rgba(29, 41, 36, 0.9);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.8rem 0.9rem;
  display: grid;
  gap: 0.5rem;
}
.device-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.5rem; }
.badges { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.badge {
  font-size: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--text);
}
.ok-badge { border-color: var(--accent-dim); color: var(--accent); }
.warn-badge { border-color: #6b5626; color: var(--warn); }
.danger-badge { border-color: #7a3030; color: var(--danger); }
.muted-badge { color: var(--muted); }
.device-facts { display: flex; flex-wrap: wrap; gap: 0.35rem 1rem; color: var(--muted); font-size: 0.85rem; }
.device-facts .mono { font-size: 0.8rem; word-break: break-all; }
.device-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; }
.sig-excellent, .sig-good { color: var(--accent); }
.sig-fair { color: var(--warn); }
.sig-weak { color: var(--danger); }