* {
      box-sizing: border-box;
    }
    
    header {
  background-color: #2980b9;
  color: white;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  box-sizing: border-box;
  z-index: 100;
  position: fixed;
}

.header-left {
  position: absolute;
  left: 20px;
  display: flex;
  gap: 10px;
}

header h1 {
  margin: 0;
  font-size: 24px;
  text-align: center;
  flex-grow: 1;
}

header button {
  background-color: transparent;
  border: none;
  color: white;
  font-size: 18px;
  cursor: pointer;
  padding: 6px 12px;
  border-radius: 6px;
  transition: background-color 0.3s ease;
}

header button:hover {
  background-color: rgba(255, 255, 255, 0.2);
}
    body {
      font-family: Arial, sans-serif;
      background-color: #f4f6f8;
      margin: 0;
      padding: 20px;
      display: flex;
      justify-content: center;
    }

    .container {
      width: 100%;
      max-width: 800px;
    }

    .card {
      background-color: #fff;
      border-radius: 12px;
      padding: 20px;
      margin-top: 70px;
      margin-bottom:10px;
      box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    }

    h2 {
      margin-top: 0;
      color: #2980b9;
      border-bottom: 2px solid #3498db;
      padding-bottom: 6px;
    }

    label {
      font-weight: bold;
      display: block;
      margin-top: 10px;
    }

    input[type="text"],
    input[type="number"],
    input[type="time"] {
      width: 100%;
      padding: 8px;
      margin-top: 5px;
      border: 1px solid #ccc;
      border-radius: 6px;
    }

    button {
      margin-top: 15px;
      padding: 10px 18px;
      border: none;
      border-radius: 6px;
      background-color: #3498db;
      color: white;
      font-weight: bold;
      cursor: pointer;
    }

    button:hover {
      background-color: #2980b9;
    }

    #resetSchedule {
      background-color: #e74c3c;
      margin-left: 10px;
    }

    #resetSchedule:hover {
      background-color: #c0392b;
    }

    .subject-item {
      background-color: #ecf5fd;
      margin-top: 10px;
      padding: 10px;
      border-radius: 6px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .subject-item button {
      background-color: #e74c3c;
      padding: 5px 10px;
      font-size: 14px;
    }

    table {
      width: 100%;
      margin-top: 25px;
      border-collapse: collapse;
      background-color: white;
      border-radius: 8px;
      overflow: hidden;
    }

    th, td {
      padding: 12px 15px;
      border-bottom: 1px solid #ddd;
    }

    th {
      background-color: #3498db;
      color: white;
      text-align: left;
    }
    .break-row {
  background-color: #e74c3c; 
  color: white;              
  font-style: italic;
  text-align: center;
}

    @media (max-width: 600px) {
      .container {
        padding: 10px;
      }
    }