* {
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  background-color: #f4f4f4;
  margin: 0;
  padding: 20px;
}

header {
  text-align: center;
  margin-bottom: 30px;
}

header img {
  width: 100px;
  height: auto;
}

h1 {
  text-align: center;
  margin-bottom: 40px;
  font-size: 2em;
  color: #333;
}

h2 {
  margin: 40px auto 20px;
  text-align: center;
  font-size: 1.5em;
  color: #555;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  max-width: 1000px;
  margin: 0 auto;
}

.grid.websites a { background-color: #2980b9; }     /* blau */
.grid.tools a { background-color: #c0392b; }   /* rot */
.grid.misc a { background-color: #16a085; }      /* grünblau */

.block {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 30px 20px;
  border-radius: 15px;
  color: white;
  text-align: center;
  font-size: 1.2em;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.block:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.blue { background-color: #3498db; }
.green { background-color: #2ecc71; }
.orange { background-color: #e67e22; }
.red { background-color: #e74c3c; }
.purple { background-color: #9b59b6; }
.gray { background-color: #7f8c8d; }

@media (max-width: 480px) {
  body {
    padding: 15px;
  }

  .block {
    font-size: 1em;
    padding: 20px 15px;
  }

  h1 {
    font-size: 1.6em;
  }
}

/* Responsive Optimierung für Mobilgeräte */
@media (max-width: 600px) {
  .grid {
    display: flex;
    flex-direction: column;
    gap: 20px;
  }

  .grid a {
    width: 100%;
  }
}