* {
  box-sizing: border-box;
}

html {
  margin: 0;
  padding: 0;

  width: 100%;
  height: 100%;
}

body {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  gap: 15px;

  margin: 0;
  padding: 15px;

  width: 100%;
  height: 100%;

  background-color: #121212;
}

nav {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  width: 200px;
  height: 100%;
  padding: 20px 16px;
  background: linear-gradient(135deg, #1e1e1e 0%, #2a2a2a 100%);
  border-radius: 15px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

hr {
  width: 100%;
  margin: 0;
  border: none;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.2) 50%,
    transparent 100%
  );
}
main {
  flex: 1;
  height: 100%;
  background-color: #090909;
  border-radius: 15px;
  border: 1px solid rgba(255, 255, 255, 0.15);
}