:root {
  --bg: #f1f5f9;
  --sidebar: #0f172a;
  --card: #fff;
  --border: #e2e8f0;
  --text: #0f172a;
  --muted: #64748b;
  --primary: #16a34a;
  --danger: #dc2626;
  --radius: 8px;
  --font: "Noto Sans SC", system-ui, sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}
a { color: var(--primary); }

.admin-layout { display: flex; min-height: 100vh; }
.admin-sidebar {
  width: 220px;
  background: var(--sidebar);
  color: #e2e8f0;
  padding: 1.25rem 0;
  flex-shrink: 0;
}
.admin-sidebar .brand {
  padding: 0 1.25rem 1.25rem;
  font-weight: 700;
  font-size: 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 0.5rem;
}
.admin-sidebar nav a {
  display: block;
  padding: 0.6rem 1.25rem;
  color: #94a3b8;
  text-decoration: none;
}
.admin-sidebar nav a:hover, .admin-sidebar nav a.active {
  color: #fff;
  background: rgba(255,255,255,0.06);
}
.admin-main { flex: 1; padding: 1.5rem 2rem; }
.admin-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}
.admin-top h1 { margin: 0; font-size: 1.35rem; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
}
.table-wrap { overflow-x: auto; }
table.data {
  width: 100%;
  border-collapse: collapse;
}
table.data th, table.data td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
}
table.data th { font-weight: 600; color: var(--muted); font-size: 0.8rem; }
.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}
.badge.on { background: #dcfce7; color: #166534; }
.badge.off { background: #fee2e2; color: #991b1b; }

.form-grid { display: grid; gap: 1rem; max-width: 560px; }
.form-grid label { display: flex; flex-direction: column; gap: 0.35rem; font-weight: 500; }
.form-grid input, .form-grid select, .form-grid textarea {
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font: inherit;
}
.form-row { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  border: none;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-secondary { background: #e2e8f0; color: var(--text); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-sm { padding: 0.35rem 0.65rem; font-size: 0.8rem; }

.alert {
  padding: 0.75rem 1rem;
  border-radius: 6px;
  margin-bottom: 1rem;
}
.alert-success { background: #dcfce7; color: #166534; }
.alert-error { background: #fee2e2; color: #991b1b; }

.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--sidebar);
}
.login-box {
  width: min(380px, 92vw);
  background: var(--card);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}
.login-box h1 { margin: 0 0 0.25rem; font-size: 1.35rem; }
.login-box p { color: var(--muted); margin: 0 0 1.5rem; font-size: 0.9rem; }

@media (max-width: 768px) {
  .admin-layout { flex-direction: column; }
  .admin-sidebar { width: 100%; }
}