:root {
    --neon-blue: #00f2ff;
    --neon-purple: #bc13fe;
    --glass: rgba(10, 10, 20, 0.85);
}
body {
    margin: 0; background: #020205; color: #e0e0ff;
    font-family: 'Segoe UI', sans-serif; display: flex;
    justify-content: center; align-items: center; min-height: 100vh;
}
.stars-bg, .stars-container {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: radial-gradient(circle at center, #1B2735 0%, #000 100%);
    z-index: -1;
}
.glass-card, .quiz-card {
    background: var(--glass); backdrop-filter: blur(15px);
    border: 1px solid rgba(0, 242, 255, 0.3); border-radius: 25px;
    padding: 3rem; width: 90%; max-width: 600px; text-align: center;
}
.progress-container { width: 100%; height: 8px; background: #111; border-radius: 10px; margin-bottom: 2rem; overflow: hidden; }
#progress-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple)); transition: 0.5s; }
.option-btn, .launch-btn, .confirm-btn {
    display: block; width: 100%; padding: 1rem; margin: 1rem 0;
    background: transparent; border: 2px solid var(--neon-blue);
    color: var(--neon-blue); border-radius: 12px; cursor: pointer;
    font-weight: bold; text-decoration: none;
}
.option-btn:hover, .launch-btn:hover { background: var(--neon-blue); color: #000; box-shadow: 0 0 20px var(--neon-blue); }
.hidden { display: none; }
.fade-in { animation: fadeIn 0.5s forwards; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }