body {
    margin: 0;
    font-family: 'Segoe UI', sans-serif;
    background: #f5f7fa;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
  }
  
  .container {
    background: white;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    text-align: center;
  }
  
  h1 {
    margin-bottom: 10px;
    color: #2c3e50;
  }
  
  p {
    color: #7f8c8d;
  }
  
  .button-container {
    margin-top: 20px;
  }
  
  .button-container button {
    margin: 10px;
    padding: 12px 24px;
    font-size: 16px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.3s;
  }
  
  .button-container button:hover {
    background-color: #2980b9;
  }
  .day-schedule {
    margin-top: 30px;
    text-align: left;
  }
  
  .day-schedule h2 {
    color: #2c3e50;
    font-size: 20px;
    margin-bottom: 15px;
  }
  
  .schedule-item {
    background-color: #ecf0f1;
    padding: 15px 20px;
    margin-bottom: 10px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
  }
  
  .schedule-item .time {
    font-weight: bold;
    color: #34495e;
    font-size: 14px;
  }
  
  .schedule-item .subject {
    font-size: 16px;
    color: #2c3e50;
    margin: 5px 0;
  }
  
  .exam-link {
    color: #2980b9;
    text-decoration: none;
    font-weight: 500;
    margin-top: 5px;
  }
  
  .exam-link:hover {
    text-decoration: underline;
  }
  
  /* Responsive enhancement */
  @media (min-width: 600px) {
    .schedule-item {
      flex-direction: row;
      justify-content: space-between;
      align-items: center;
    }
  
    .schedule-item .subject {
      margin: 0 20px;
      flex: 1;
    }
  
    .schedule-item .time,
    .schedule-item .exam-link {
      flex-shrink: 0;
    }
  }
  .exam-link.expired {
    color: #999;
    text-decoration: line-through;
    font-style: italic;
    cursor: not-allowed;
  }