:root {
  --black: #000;
  --white: #fff;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: var(--black);
  color: var(--white);
  font-family: monospace, monospace;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection {
  background: var(--white);
  color: var(--black);
}

.wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem 2.5rem;
}

.nb {
  color: var(--black);
  background: #ffd700;
  font-size: 1rem;
  padding: 0.15em 0.3em;
  font-weight: 700;
}

.top-nav {
  display: flex;
  gap: 1.5rem;
}

.top-nav a {
  color: var(--white);
  text-decoration: none;
  font-size: 1rem;
  opacity: 0.7;
  transition: opacity 0.15s;
}

.top-nav a:hover,
.top-nav a.active {
  opacity: 1;
}

.footer {
  text-align: center;
  padding: 2rem;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  opacity: 0.3;
}

@media (max-width: 640px) {
  .top-bar {
    padding: 1.25rem 1.5rem;
  }
  .top-nav {
    gap: 0.75rem;
  }
  .top-nav a {
    font-size: 0.85rem;
  }
  .nb {
    font-size: 0.85rem;
    padding: 0.1em 0.25em;
  }
}