:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #1d4ed8;
  --danger: #dc2626;
  --border: #e5e7eb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: #111827;
  color: #fff;
}

.brand { font-weight: bold; letter-spacing: 0.5px; }
.spacer { flex: 1; }

.layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: calc(100vh - 52px);
}

.sidebar {
  background: #0f172a;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar a {
  color: #e2e8f0;
  text-decoration: none;
  padding: 10px 12px;
  border-radius: 8px;
  background: rgba(255,255,255,0.04);
}

.sidebar a:hover { background: rgba(255,255,255,0.08); }

.content { padding: 20px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 16px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

table th, table td {
  border-bottom: 1px solid var(--border);
  text-align: left;
  padding: 8px;
}

.btn {
  display: inline-block;
  padding: 8px 12px;
  border: 1px solid var(--border);
  background: #fff;
  color: #111827;
  text-decoration: none;
  border-radius: 6px;
  cursor: pointer;
}

.btn.primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn.danger { background: var(--danger); color: #fff; border-color: var(--danger); }

input, select {
  display: block;
  width: 100%;
  padding: 8px;
  margin: 6px 0 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
}

pre {
  background: #0b1020;
  color: #e2e8f0;
  padding: 12px;
  border-radius: 8px;
  overflow-x: auto;
}

.login {
  display: grid;
  place-items: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #0f172a, #1d4ed8);
}

.login-card {
  background: #fff;
  padding: 24px;
  border-radius: 12px;
  width: 320px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.2);
}

.alert.error {
  padding: 8px;
  background: #fee2e2;
  border: 1px solid #fecaca;
  color: #991b1b;
  margin-bottom: 12px;
  border-radius: 6px;
}

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { flex-direction: row; flex-wrap: wrap; }
}