:root {
  --primary-color: #3498db;
  --secondary-color: #2ecc71;
  --background-color: #f8f9fa;
  --text-color: #333;
  --border-color: #e0e0e0;
}

body {
  font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
}

h1 a {
  text-decoration: none;
  color: black;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.card {
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  padding: 2rem;
  margin-bottom: 2rem;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin-bottom: 1rem;
  font-weight: 600;
}

.main-title {
  font-size: 2.5rem;
  color: var(--primary-color);
  text-align: center;
  margin-bottom: 2rem;
}

.sub-title {
  font-size: 1.5rem;
  color: var(--secondary-color);
  text-align: center;
  margin-bottom: 1.5rem;
}

.table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin-bottom: 2rem;
  background-color: #fff;
  border-radius: 8px;
  overflow: hidden;
}

.table thead th {
  background-color: var(--primary-color);
  color: #fff;
  font-weight: 600;
  text-align: left;
  padding: 1rem;
  border-bottom: 2px solid var(--secondary-color);
}

.table tbody td,
.table tbody th {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.table tbody tr:last-child td {
  border-bottom: none;
}

.table tbody tr:hover {
  background-color: rgba(52, 152, 219, 0.1);
}

.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  border-radius: 4px;
  transition: all 0.3s ease;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--primary-color);
  color: #fff;
  border: none;
}

.btn-primary:hover {
  background-color: #2980b9;
}

.btn-secondary {
  background-color: var(--secondary-color);
  color: #fff;
  border: none;
}

.btn-secondary:hover {
  background-color: #27ae60;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-control {
  display: block;
  width: 100%;
  padding: 0.5rem;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--text-color);
  background-color: #fff;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  transition: border-color 0.3s ease;
}

.form-control:focus {
  border-color: var(--primary-color);
  outline: 0;
  box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
}

.alert {
  padding: 1rem;
  margin-bottom: 1rem;
  border: 1px solid transparent;
  border-radius: 4px;
}

.alert-success {
  color: #155724;
  background-color: #d4edda;
  border-color: #c3e6cb;
}

.alert-info {
  color: #0c5460;
  background-color: #d1ecf1;
  border-color: #bee5eb;
}

.alert-warning {
  color: #856404;
  background-color: #fff3cd;
  border-color: #ffeeba;
}

.alert-danger {
  color: #721c24;
  background-color: #f8d7da;
  border-color: #f5c6cb;
}

@media (min-width: 992px) {
  .col-lg-8 {
    width: 100%;
  }
}

@media (min-width: 1200px) {
  .col-lg-8 {
    width: 66%;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }

  .card {
    padding: 1rem;
  }

  .table thead {
    display: none;
  }

  .table,
  .table tbody,
  .table tr,
  .table td {
    display: block;
    width: 100%;
  }

  .table tr {
    margin-bottom: 1rem;
  }

  .table td {
    text-align: right;
    padding-left: 50%;
    position: relative;
  }

  .table td::before {
    content: attr(data-label);
    position: absolute;
    left: 6px;
    width: 45%;
    padding-right: 10px;
    white-space: nowrap;
    text-align: left;
    font-weight: bold;
  }
}