:root {
  --bg: #f4f7fb;
  --panel: #ffffff;
  --panel-soft: #edf3fb;
  --line: #d8e0ec;
  --text: #183049;
  --muted: #62748a;
  --accent: #0057d9;
  --accent-strong: #003ea6;
  --danger: #b42318;
  --warning: #b54708;
  --ok: #027a48;
  --radius: 18px;
  --shadow: 0 18px 40px rgba(24, 48, 73, 0.08);
  --font-ui: "IBM Plex Sans", "Segoe UI", sans-serif;
  --font-display: "Space Grotesk", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font-ui);
  color: var(--text);
  background:
    radial-gradient(circle at top right, rgba(0, 87, 217, 0.09), transparent 24rem),
    linear-gradient(180deg, #f7f9fc 0%, #eef3f9 100%);
}
a { color: var(--accent); text-decoration: none; }
.shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  min-height: 100vh;
}
.sidebar {
  padding: 2rem 1.3rem;
  background: linear-gradient(180deg, #13314f 0%, #0e2237 100%);
  color: white;
}
.brand {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}
.sidebar a {
  display: block;
  color: rgba(255, 255, 255, 0.82);
  padding: 0.8rem 1rem;
  border-radius: 14px;
  margin-bottom: 0.35rem;
}
.sidebar a.active,
.sidebar a:hover {
  background: rgba(255, 255, 255, 0.11);
  color: white;
}
.content {
  padding: 2rem;
}
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}
.page-title {
  font-family: var(--font-display);
  font-size: 2rem;
  margin: 0;
}
.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
}
.grid {
  display: grid;
  gap: 1rem;
}
.grid.cards {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}
.metric-value {
  font-family: var(--font-display);
  font-size: 2rem;
  margin-top: 0.4rem;
}
table {
  width: 100%;
  border-collapse: collapse;
}
th, td {
  text-align: left;
  padding: 0.8rem 0.55rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
th {
  font-size: 0.84rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--muted);
}
.row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}
label {
  display: grid;
  gap: 0.4rem;
  font-size: 0.95rem;
}
input, textarea, select, button {
  font: inherit;
}
input, textarea, select {
  width: 100%;
  padding: 0.8rem 0.9rem;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: white;
  color: var(--text);
}
textarea { min-height: 120px; resize: vertical; }
button, .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border: 0;
  border-radius: 999px;
  padding: 0.8rem 1.2rem;
  background: var(--accent);
  color: white;
  font-weight: 600;
  cursor: pointer;
}
button.secondary, .button.secondary {
  background: var(--panel-soft);
  color: var(--text);
}
.checks {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.checks label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.3rem 0.55rem;
  border-radius: 999px;
  background: var(--panel-soft);
  color: var(--text);
  font-size: 0.84rem;
  font-weight: 600;
}
.status-ok { color: var(--ok); }
.status-warning { color: var(--warning); }
.status-danger { color: var(--danger); }
.muted { color: var(--muted); }
.stack { display: grid; gap: 1rem; }
.code-block {
  white-space: pre-wrap;
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: 0.88rem;
  background: #0f2338;
  color: #eff6ff;
  border-radius: 16px;
  padding: 1rem;
}
.login-wrap {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem;
}
.login-card {
  width: min(480px, 100%);
}
.error {
  color: var(--danger);
  font-weight: 600;
}
@media (max-width: 960px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar { padding-bottom: 1rem; }
  .content { padding: 1rem; }
  .row, .form-grid { grid-template-columns: 1fr; }
}