/* Cyberpunk Matrix Background */
body {
  font-family: "Courier New", monospace;
  background: black;
  color: #00ff00;
  overflow: hidden;
  margin: 0;
  padding: 0;
}

/* Matrix Effect */
canvas {
  position: fixed;
  top: 0;
  left: 0;
  z-index: -1;
}

/* Header */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  background: rgba(0, 0, 0, 0.8);
}

.menu-button {
  cursor: pointer;
  font-size: 20px;
  padding: 10px;
  background: #00ff00;
  border: none;
  color: black;
  font-weight: bold;
}

/* Fullscreen Menu */
.menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.9);
  color: #00ff00;
  text-align: center;
  padding-top: 50px;
  z-index: 10;
}

.menu a {
  display: block;
  font-size: 24px;
  margin: 20px;
  color: #00ff00;
  text-decoration: none;
}

/* Main Title */
h1 {
  text-align: center;
  font-size: 48px;
  text-shadow: 0px 0px 10px #00ff00;
}

/* Button */
.btn {
  display: block;
  margin: 20px auto;
  padding: 15px;
  font-size: 18px;
  cursor: pointer;
  background: #00ff00;
  color: black;
  border: none;
  width: 200px;
  text-align: center;
}

.pionowo {
  writing-mode: vertical-lr; /* Top to bottom, left to right */
  text-orientation: upright; /* Keeps letters upright, not rotated */
  font-size: 16px;
  font-family: Arial, sans-serif;
  padding: 16px;
}

a {
  display: block;
  margin: 20px 0;
  color: transparent;
  text-decoration: none;
}

a:hover {
  color: black;
  background-color: #00ff00;
  padding: 5px;
  border-radius: 5px;
  transition: all 0.3s ease;
}

.submenu {
  position: relative;
}

.submenu-items {
  display: none;
  flex-direction: column;
  position: absolute;
  top: 100%;
  left: 0;
  padding: 5px;
  color: transparent;
  background-color: transparent;
  border: 1px solid #444;
  border-radius: 5px;
  min-height: 400px;
}

.submenu:hover .submenu-items {
  display: flex;
}

.submenu-items a {
  margin: 3px 0;
}