* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 10px;
  font-family: Roboto, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  background-color: #f4f4f4;
  color: #222;
}

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  padding: 40px 20px;
}

h1 {
  margin-bottom: 30px;
  font-size: 2rem;
  text-align: center;
}

.menu-top {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
  flex-wrap: nowrap;
  justify-content: center;
}

.separator {
  width: 100%;
  max-width: 600px;
  height: 1px;
  background-color: #ccc;
  margin: 20px 0;
}

.division-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  width: 100%;
  max-width: 600px;
  margin-bottom: 30px;
  justify-content: center;
}

@media (max-width: 767px) {
  .division-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.menu-top button,
.division-grid button,
#viewSheetBtn {
  padding: 12px;
  font-size: 1rem;
  background-color: white;
  border: 1px solid #ccc;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  width: 100%;
  text-align: center;
  white-space: nowrap;
}

.menu-top button:hover,
.division-grid button:hover,
#viewSheetBtn:hover {
  background-color: #eaeaea;
}

.menu-top button.active,
.division-grid button.active,
#viewSheetBtn.green {
  background-color: #28a745;
  color: white;
  font-weight: bold;
  border-color: #1f7a32;
}

#content {
  max-width: 800px;
  width: 100%;
  text-align: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

#content.visible {
  opacity: 1;
}

#content h2 {
  margin-bottom: 30px;
}

@media (prefers-color-scheme: dark) {
  body {
    background-color: #121212;
    color: #eee;
  }

  .menu-top button,
  .division-grid button,
  #viewSheetBtn {
    background-color: #1e1e1e;
    border: 1px solid #444;
    color: #eee;
  }

  .menu-top button:hover,
  .division-grid button:hover,
  #viewSheetBtn:hover {
    background-color: #333;
  }

  .menu-top button.active,
  .division-grid button.active,
  #viewSheetBtn.green {
    background-color: #3cb371;
    border-color: #2e8b57;
    color: #fff;
  }

  .separator {
    background-color: #444;
  }
}

.hidden {
  display: none;
}

.logo {
    max-width: 180px;
    width: 100%;
    height: auto;
    display: block;
    margin: 0 auto 25px;
}

.logo {
    max-width: 180px;
    width: 100%;
    height: auto;
    display: block;
    margin: 0 auto 25px;
}