html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont;
  background: #f3f4f6;
  color: #111827;

  display: flex;
  flex-direction: column;
}

header {
  background: #1d5e9e;
  color: white;
  padding: 16px;
  text-align: center;
  font-size: 1.2rem;
  font-weight: bold;
}

footer {
  background: #1d5e9e;
  color: white;
  padding: 12px;
  text-align: center;
  font-size: 0.85rem;
  font-weight: bold;
}

main {
  padding: 16px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  flex: 1;
}

.card {
  background: white;
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.08);
  transition: transform 0.2s ease;
}

.card:hover {
  transform: scale(1.03);
}

.icon {
  font-size: 32px;
  margin-bottom: 8px;
}

.install-container {
  padding: 16px;
  display: flex;
  justify-content: center;
}

.install-btn {
  background: linear-gradient(135deg, #1f2937, #374151);
  color: #ffffff;
  border: none;
  border-radius: 14px;
  padding: 14px 24px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;

  display: flex;
  align-items: center;
  gap: 10px;

  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.install-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.35);
}

.install-btn:active {
  transform: scale(0.97);
}

.install-btn span {
  font-size: 1.3rem;
}