* { box-sizing: border-box; margin: 0; padding: 0; font-family: Arial, sans-serif; }
body { background: #f4f7fb; color: #1f2937; }
a { text-decoration: none; color: #0f62fe; }
.layout { display: flex; min-height: 100vh; }
.sidebar { width: 240px; background: #132238; color: #fff; padding: 24px; }
.sidebar h2 { margin-bottom: 18px; }
.sidebar nav a { display: block; color: #fff; padding: 10px 0; border-bottom: 1px solid rgba(255,255,255,0.08); }
.content { flex: 1; padding: 20px; }
.topbar { display: flex; justify-content: space-between; background: #fff; padding: 16px; border-radius: 10px; margin-bottom: 20px; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 20px; }
.card, .panel { background: #fff; padding: 20px; border-radius: 12px; box-shadow: 0 2px 10px rgba(0,0,0,0.08); }
.card h3 { font-size: 16px; margin-bottom: 10px; }
.card p { font-size: 30px; font-weight: bold; }
.panel h2, .module-page h1 { margin-bottom: 16px; }
.module-page { padding: 24px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1.4fr; gap: 20px; margin-top: 14px; }
form { display: grid; gap: 12px; }
input, select, textarea, button { width: 100%; padding: 12px; border-radius: 8px; border: 1px solid #d1d5db; }
button, .btn-small { background: #0f62fe; color: #fff; border: none; cursor: pointer; display: inline-block; }
.btn-small { padding: 8px 12px; border-radius: 6px; }
table { width: 100%; border-collapse: collapse; }
th, td { border-bottom: 1px solid #e5e7eb; padding: 12px; text-align: left; font-size: 14px; }
th { background: #f8fafc; }
.login-page { display: flex; justify-content: center; align-items: center; min-height: 100vh; }
.login-box { width: 420px; background: #fff; padding: 30px; border-radius: 14px; box-shadow: 0 2px 12px rgba(0,0,0,0.08); }
.login-box h1 { margin-bottom: 20px; }
.alert.danger { background: #fee2e2; color: #991b1b; padding: 10px; border-radius: 8px; margin-bottom: 14px; }
.muted { color: #6b7280; margin-top: 10px; }
@media (max-width: 900px) {
  .layout { flex-direction: column; }
  .sidebar { width: 100%; }
  .cards, .grid-2 { grid-template-columns: 1fr; }
}