.grades-container {
  max-width: 600px;
  margin: 40px auto;
  padding: 16px;
}

.password-section {
  background: #f5f5f5;
  padding: 24px;
  border-radius: 8px;
  margin-bottom: 24px;
}

.password-section label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

.password-section input {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 16px;
}

.password-section button {
  width: 100%;
  padding: 10px;
  background: #2b6cb0;
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  margin-top: 12px;
}

.password-section button:hover {
  background: #1e4f7f;
}

.hidden { display: none; }

.grades-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 24px;
}

.grades-table th,
.grades-table td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid #ddd;
}

.grades-table th {
  background: #f5f5f5;
  font-weight: 600;
}

.grades-table tr:hover {
  background: #fafafa;
}

.grade-value {
  font-weight: 600;
  color: #2b6cb0;
}

.logout-btn {
  background: #d9534f;
  color: #fff;
  padding: 8px 12px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
}

.logout-btn:hover {
  background: #c9302c;
}

.grades-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}