html {
  height: 100%;
  width: 100%;
}

body {
  background: linear-gradient(135deg, #2c3e50, #34495e, #7f8c8d);
  background-attachment: fixed;
  margin: 0;
  padding: 20px;
  font-family: Arial, sans-serif;
  color: #ecf0f1;
  min-height: 100vh;
  box-sizing: border-box;
}

* {
  box-sizing: border-box;
}

.image-container {
  display: flex;
  justify-content: center;
  margin-bottom: 30px;
}

.header-image {
  width: 15vw;
  min-width: 120px;
  max-width: 200px;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

h1 {
  text-align: center;
  color: white;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
  margin: 20px 0;
  font-size: 2.5rem;
}

.notice-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  background-color: rgba(255, 255, 255, 0.95);
  color: #2c3e50;
  border-radius: 10px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
  line-height: 1.6;
}

.notice-content p {
  margin-bottom: 15px;
  text-align: justify;
}

.fee-notice {
  font-weight: bold;
  margin-top: 5px;
  display: inline-block;
}

#fee_conditions {
  margin-top: 20px;
  padding: 15px;
  background-color: #f8f9fa;
  border: 2px solid #dc3545;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

#fee_conditions h3 {
  color: #dc3545;
  margin-top: 0;
  margin-bottom: 10px;
  font-weight: bold;
}

#fee_conditions p {
  margin: 5px 0;
  font-size: 16px;
  color: #2c3e50;
}

#user_list {
  margin-top: 30px;
  padding: 20px;
  background-color: #f8f9fa;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

#user_list h3 {
  color: #28a745;
  margin-top: 0;
  margin-bottom: 15px;
  font-weight: bold;
}

#user_list ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
  columns: 2;
  column-gap: 30px;
}

#user_list li {
  margin: 8px 0;
  padding: 5px 10px;
  background-color: #e9ecef;
  border-radius: 4px;
  font-family: monospace;
  font-weight: bold;
  color: #495057;
  break-inside: avoid;
}

/* Tablet styles (768px and below) */
@media (max-width: 768px) {
  body {
    padding: 15px;
  }

  h1 {
    font-size: 2rem;
    margin: 15px 0;
  }

  .header-image {
    width: 25vw;
    min-width: 100px;
    max-width: 180px;
  }

  .notice-content {
    padding: 15px;
  }

  #fee_conditions {
    padding: 12px;
  }

  #user_list {
    padding: 15px;
  }

  #user_list ul {
    columns: 1;
    column-gap: 0;
  }

  #user_list li {
    margin: 6px 0;
    padding: 8px 10px;
  }
}

/* Mobile styles (480px and below) */
@media (max-width: 480px) {
  body {
    padding: 10px;
  }

  h1 {
    font-size: 1.5rem;
    margin: 10px 0;
  }

  .header-image {
    width: 30vw;
    min-width: 80px;
    max-width: 150px;
  }

  .notice-content {
    padding: 12px;
    margin: 0 5px;
  }

  .notice-content p {
    text-align: left;
    font-size: 14px;
  }

  #fee_conditions {
    padding: 10px;
    margin-top: 15px;
  }

  #fee_conditions h3 {
    font-size: 16px;
  }

  #fee_conditions p {
    font-size: 14px;
  }

  #user_list {
    padding: 10px;
    margin-top: 20px;
  }

  #user_list h3 {
    font-size: 16px;
  }

  #user_list li {
    margin: 4px 0;
    padding: 6px 8px;
    font-size: 12px;
  }
}

/* Large mobile styles (320px and below) */
@media (max-width: 320px) {
  body {
    padding: 8px;
  }

  h1 {
    font-size: 1.3rem;
  }

  .header-image {
    width: 40vw;
    min-width: 70px;
    max-width: 120px;
  }

  .notice-content {
    padding: 10px;
    margin: 0 2px;
  }

  .notice-content p {
    font-size: 13px;
  }

  #fee_conditions {
    padding: 8px;
  }

  #fee_conditions h3 {
    font-size: 14px;
  }

  #fee_conditions p {
    font-size: 13px;
  }

  #user_list {
    padding: 8px;
  }

  #user_list h3 {
    font-size: 14px;
  }

  #user_list li {
    padding: 5px 6px;
    font-size: 11px;
  }
}