* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: #0f172a;
  color: #e2e8f0;
}
a { color: #38bdf8; text-decoration: none; }
.layout { display: flex; min-height: 100vh; max-width: 100vw; overflow-x: clip; }
.sidebar {
  width: 260px;
  background: #1e293b;
  padding: 24px 16px;
  flex-shrink: 0;
  overflow-y: auto;
}
.sidebar h1 { font-size: 1rem; margin: 0 0 24px; letter-spacing: 1px; }
.sidebar .nav-group { margin-bottom: 14px; }
.sidebar .nav-group-title {
  color: #64748b;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  margin: 14px 8px 6px;
  text-transform: uppercase;
}
.sidebar nav a {
  display: block;
  padding: 10px 12px;
  border-radius: 8px;
  color: #cbd5e1;
  margin-bottom: 4px;
}
.sidebar nav a.nav-primary {
  color: #f8fafc;
  font-weight: 700;
  background: rgba(15, 23, 42, 0.36);
}
.sidebar nav a.nav-child {
  padding: 8px 12px 8px 22px;
  font-size: 0.88rem;
  color: #94a3b8;
}
.sidebar nav a.nav-muted {
  color: #94a3b8;
}
.sidebar nav a:hover, .sidebar nav a.active { background: #334155; color: #fff; }
.main { flex: 1; padding: 32px; overflow: auto; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; margin-bottom: 32px; }
.card {
  background: #1e293b;
  border-radius: 12px;
  padding: 20px;
  border: 1px solid #334155;
}
.card .label { font-size: 0.85rem; color: #94a3b8; margin-bottom: 8px; }
.card .value { font-size: 1.75rem; font-weight: 700; }
.card .sub { font-size: 0.8rem; color: #64748b; margin-top: 6px; }
.section-title { font-size: 1.1rem; margin: 24px 0 12px; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid #334155; }
th { color: #94a3b8; font-weight: 500; }
.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.login-box {
  background: #1e293b;
  padding: 40px;
  border-radius: 16px;
  width: 100%;
  max-width: 400px;
  border: 1px solid #334155;
}
.login-box h1 { margin: 0 0 24px; text-align: center; font-size: 1.25rem; }
.form-input {
  width: 100%;
  padding: 10px 12px;
  margin-bottom: 16px;
  border-radius: 8px;
  border: 1px solid #475569;
  background: #0f172a;
  color: #e2e8f0;
}
.btn {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 8px;
  background: #2563eb;
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}
.btn:hover { background: #1d4ed8; }
.hint { font-size: 0.8rem; color: #64748b; text-align: center; margin-top: 12px; }

@media (max-width: 900px) {
  .layout { flex-direction: column; }
  .sidebar {
    width: 100%;
    padding: 16px;
  }
  .sidebar nav {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
  }
  .sidebar nav a {
    margin-bottom: 0;
  }
  .main {
    padding: 16px;
    min-width: 0;
  }
  table {
    display: block;
    overflow-x: auto;
    max-width: 100%;
  }
  .ops {
    min-width: 220px;
  }
}