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

/* Background */
body {
  font-family: "Helvetica Neue", Arial, sans-serif;
  background-color: #000000;
  color: #FFD51A;
  line-height: 1.6;
}

/* Main container (foreground card) */
.paper {
  max-width: 800px;
  margin: 60px auto;
  padding: 40px;
  background: #090952;

  /* Glow effect */
  box-shadow:
    0 0 20px rgba(255, 198, 26, 0.15),
    0 0 40px rgba(255, 198, 26, 0.08);

  border-radius: 8px;
}

/* Header */
header {
  text-align: center;
  margin-bottom: 40px;
}

/* Title */
header h1 {
  font-size: 28px;
  font-weight: 600;
  color: #FFC61A;
  margin-bottom: 10px;
}

/* Subtitle */
header h2 {
  font-size: 16px;
  font-weight: 400;
  color: #FFD51A;
  margin-bottom: 10px;
}

/* Author */
.author {
  font-size: 14px;
  color: #FFD51A;
  opacity: 0.8;
}

/* Sections */
section {
  margin-bottom: 30px;
}

/* Section headers */
h3 {
  font-size: 18px;
  margin-bottom: 10px;
  font-weight: 600;
  color: #FFE81A;

  /* subtle glow underline effect */
  border-left: 4px solid #FFE81A;
  padding-left: 10px;
}

/* Paragraph text */
p {
  font-size: 14.5px;
  margin-bottom: 12px;
  color: #FFD51A;
}

/* Keywords (slight variation) */
section:nth-of-type(2) p {
  font-style: italic;
  opacity: 0.9;
}

/* Figures */
figure {
  margin: 20px 0;
  text-align: center;
}

figure img {
  max-width: 100%;
  border-radius: 4px;
}

/* Caption */
figcaption {
  font-size: 12px;
  color: #FFD51A;
  opacity: 0.7;
  margin-top: 6px;
}

/* References */
ul {
  padding-left: 20px;
}

li {
  font-size: 14px;
  margin-bottom: 8px;
  color: #FFD51A;
}

/* Mobile */
@media (max-width: 768px) {
  .paper {
    margin: 20px;
    padding: 20px;
  }

  header h1 {
    font-size: 22px;
  }
}