:root {

  --bg: #121212;

  --text: #e0e0e0;

  --card: #1e1e1e;

  --accent: #90caf9;

  --hover: #2c2c2c;

  --correct: #4caf50;

  --wrong: #f44336;

}

* {

  box-sizing: border-box;

}

body {

  background-color: var(--bg);

  color: var(--text);

  font-family: 'Segoe UI', sans-serif;

  margin: 0;

  padding: 0;

}

.container {

  max-width: 800px;

  margin: auto;

  padding: 30px 20px;

}

h1, h2, h3 {

  color: #ffffff;

  text-align: center;

  margin-bottom: 20px;

}

.question-block, .game-box {

  background-color: var(--card);

  padding: 20px;

  margin: 20px 0;

  border-radius: 8px;

  box-shadow: 0 0 10px rgba(255,255,255,0.05);

}

.options {

  list-style-type: none;

  padding: 0;

}

.options li {

  padding: 10px;

  background-color: var(--hover);

  margin: 5px 0;

  border-radius: 5px;

  transition: background 0.2s;

}

.options li:hover {

  background-color: var(--accent);

  cursor: pointer;

  color: #000;

}

button {

  background-color: var(--accent);

  color: #000;

  border: none;

  padding: 10px 20px;

  margin-top: 10px;

  border-radius: 5px;

  font-size: 1em;

  width: 100%;

}

button:hover {

  background-color: #64b5f6;

  cursor: pointer;

}

.answer {

  color: var(--correct);

  margin-top: 10px;

  font-weight: bold;

}

.explanation {

  margin-top: 5px;

  font-style: italic;

  color: #aaa;

}

a {

  color: var(--accent);

  text-decoration: none;

}

a:hover {

  text-decoration: underline;

}

@media screen and (max-width: 600px) {

  .container {

    padding: 20px 10px;

  }

  button {

    font-size: 0.95em;

  }

  ul.options li {

    font-size: 0.95em;

  }

}