* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100%;
  background: #000;
  color: #fff;
  font-family: Verdana;
  font-size: 10px;
}

body {
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 24px 24px;
}

.banner {
  background: linear-gradient(90deg, #ff0000, #ff7a00, #ffff00);
  color: #000;
  font-weight: normal;
  text-align: center;
  padding: 12px 10px;
  border-bottom: 4px solid #fff;
  letter-spacing: 2px;
  text-transform: uppercase;
}

.layout {
  display: flex;
  min-height: calc(100vh - 86px);
}

.sidebar {
  width: 220px;
  padding: 20px 14px;
  background: #111;
  border-right: 4px solid #888;
}

.logo {
  margin-bottom: 18px;
  padding: 12px 10px;
  background: #222;
  color: #ff0;
  text-align: center;
  font-weight: normal;
  letter-spacing: 2px;
  border: 3px ridge #ccc;
}

.nav-btn {
  display: block;
  margin: 10px 0;
  padding: 12px 14px;
  background: #c00;
  color: #ff0;
  text-decoration: none;
  font-weight: normal;
  text-align: center;
  border: 3px outset #ff8080;
  text-transform: uppercase;
}

.nav-btn:hover {
  background: #ff1a1a;
  border-style: inset;
}

.counter-box {
  margin-top: 22px;
  padding: 12px;
  border: 3px ridge #ccc;
  background: #000;
  text-align: center;
}

.counter-label {
  color: #ff0;
  font-weight: normal;
  margin-bottom: 8px;
  letter-spacing: 1px;
}

.visitor-counter {
  display: inline-block;
  min-width: 120px;
  padding: 10px 12px;
  background: #200;
  color: #0f0;
  font-family: Verdana;
  font-size: 10px;
  border: 2px inset #666;
  letter-spacing: 3px;
}

.content {
  flex: 1;
  padding: 24px;
}

.panel {
  margin-bottom: 20px;
  padding: 18px;
  border: 3px ridge #888;
  background: #000;
}

h1, h2 {
  margin-top: 0;
  color: #fff;
  text-shadow: 0 0 4px #888;
}

.blink {
  animation: blink 1s step-start infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

p {
  line-height: 1.6;
}

.footer {
  border-top: 4px solid #fff;
  background: #111;
  color: #ff0;
  padding: 8px 0;
  font-weight: normal;
}

marquee {
  font-size: 10px;
}

@media (max-width: 768px) {
  .layout {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 4px solid #888;
  }
}