:root {
  --bg: #0f1115;
  --panel: #161a22;
  --border: #2a3140;
  --text: #e8ecf4;
  --muted: #8b95a8;
  --accent: #4f8cff;
  --ok: #3dd68c;
  --sidebar: 220px;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif; background: var(--bg); color: var(--text); }

.app { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar);
  background: #12151c;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 20px 12px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; padding: 0 8px 20px; }
.logo { width: 32px; height: 32px; border-radius: 8px; background: var(--accent); display: grid; place-items: center; font-weight: 700; }

.nav { display: flex; flex-direction: column; gap: 4px; }
.nav-item {
  background: transparent;
  border: 0;
  color: var(--text);
  text-align: left;
  padding: 10px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
}
.nav-item:hover { background: #1c2230; }
.nav-item.active { background: #1e2a44; color: #fff; }
.nav-item:disabled { opacity: 0.4; cursor: not-allowed; }

.sidebar-foot { margin-top: auto; padding: 12px 8px; color: var(--muted); font-size: 12px; }

.content { flex: 1; padding: 28px 32px; overflow: auto; }
.view { display: none; }
.view.active { display: block; }

.view-header h1 { margin: 0 0 4px; font-size: 24px; }
.view-header p { margin: 0 0 20px; color: var(--muted); }

.panel { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 20px; }

.status-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; }
.status-card { background: #1c2230; border-radius: 10px; padding: 14px; }
.status-card .label { font-size: 12px; color: var(--muted); margin-bottom: 4px; }
.status-card .value { font-weight: 600; }
.status-card .value.ok { color: var(--ok); }
.status-card .meta { font-size: 12px; color: var(--muted); margin-top: 4px; }

.note { margin-top: 16px; color: var(--muted); font-size: 13px; }

@media (max-width: 720px) {
  .app { flex-direction: column; }
  .sidebar { width: 100%; border-right: 0; border-bottom: 1px solid var(--border); padding: 12px; }
  .nav { flex-direction: row; overflow-x: auto; }
  .content { padding: 16px; }
}