html, body {
  margin: 0;
  padding: 0;
  background: #1b1c1e;
  color: #f3f3f3;
  font-family: 'Segoe UI', Arial, sans-serif;
  height: 100%;
}

#game-container {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
  width: 100vw;
}

#game-canvas {
  background: #25272b;
  border-radius: 18px;
  box-shadow: 0 4px 18px #181818b0;
  margin: 32px 24px;
  display: block;
}

#ui {
  width: 320px;
  margin-top: 32px;
  padding: 16px;
  background: #222328;
  border-radius: 16px;
  box-shadow: 0 2px 12px #0004;
  min-height: 520px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

#header {
  width: 100%;
  margin-bottom: 12px;
  text-align: center;
}

#header h1 {
  margin: 0;
  font-size: 2rem;
  letter-spacing: 1px;
}

#scoreboard {
  font-size: 1.2rem;
  margin: 8px 0;
}

#username-prompt {
  margin: 12px 0;
  display: flex;
  gap: 8px;
  justify-content: center;
}

#username-prompt input {
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid #333;
  background: #191a1c;
  color: #f3f3f3;
  font-size: 1rem;
  width: 150px;
}

#username-prompt button,
#game-over button {
  padding: 6px 18px;
  border-radius: 6px;
  border: none;
  background: #67e56e;
  color: #222;
  font-weight: bold;
  font-size: 1rem;
  cursor: pointer;
  transition: background .2s;
}
#username-prompt button:hover,
#game-over button:hover {
  background: #54c85a;
}

#game-over {
  margin: 16px 0;
  font-size: 1.2rem;
  color: #e25a4f;
}

#leaderboard-container {
  width: 100%;
  margin-top: 16px;
}

#leaderboard-container h2 {
  font-size: 1.3rem;
  margin: 10px 0 4px 0;
}

#leaderboard {
  padding: 0 0 0 18px;
  margin: 0;
}

#leaderboard li {
  font-size: 1.08rem;
  margin-bottom: 2px;
  color: #e7e7e7;
}

footer {
  text-align: center;
  padding: 16px 0;
  color: #bbb;
  font-size: .92rem;
}
footer a { color: #81d6e3; text-decoration: underline; }