body {
  font-family: Arial, sans-serif;
  background: #f6f8fb;
  color: #233142;
  margin: 0;
}
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px;
}
.card {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.08);
  padding: 24px;
  margin-bottom: 24px;
}
.banner {
  width: 100%;
  border-radius: 12px;
  display: block;
  margin-bottom: 16px;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}
form input, form select, form textarea, form button {
  width: 100%;
  padding: 10px 12px;
  margin-bottom: 12px;
  border: 1px solid #d5dbe3;
  border-radius: 8px;
}
form button {
  background: #2b7a78;
  color: #fff;
  border: none;
  cursor: pointer;
}
.btn-secondary {
  background: #6c757d;
  color: #fff;
  border: none;
  padding: 8px 12px;
  border-radius: 6px;
  text-decoration: none;
  display: inline-block;
}
.alert-success { background: #e8f7ee; color: #157347; padding: 12px; border-radius: 8px; margin-bottom: 12px; }
.alert-error { background: #fde8e8; color: #b42318; padding: 12px; border-radius: 8px; margin-bottom: 12px; }
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { padding: 10px; border-bottom: 1px solid #e6eaf0; text-align: left; }
.nav { background: #16324f; color: #fff; padding: 12px 24px; display: flex; justify-content: space-between; align-items: center; }
.nav a { color: #fff; text-decoration: none; margin-left: 12px; }
.small { font-size: 0.9rem; color: #64748b; }
.muted { opacity: 0.8; }