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

html, body {
  font-family: "Inter", "Helvetica Neue", Helvetica, Arial, sans-serif;
  background-color: #fafafa;
  color: #222;
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container {
  max-width: 900px;
  margin: 3rem auto;
  padding: 0 1rem;
}

/* Title & authors */
.title {
  text-align: center;
  margin-bottom: 2.5rem;
  padding: 2rem 1rem; /* ✅ added padding */
}

.title h1 {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.3;
  color: #111;
  margin-bottom: 1.5rem;
}

.authors-list {
  font-size: 1rem;
  color: #555;
}

.authors-list p {
  margin: 0.2rem 0;
}

.footnote {
  margin-top: 0.6rem;
  font-size: 0.9rem;
  color: #777;
}

/* Links (GitHub, arXiv) */
.links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap; /* ✅ responsive */
  gap: 1rem;
  margin: 2rem 0;
}

.links a {
  text-decoration: none;
  padding: 0.6rem 1rem;
  border-radius: 8px;
  font-weight: 500;
  transition: all 0.2s ease;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.github-link {
  background-color: #24292f;
  color: #fff;
}

.github-link:hover {
  background-color: #000;
}

.arxiv-link {
  background-color: #e0e0e0;
  color: #222;
}

.arxiv-link:hover {
  background-color: #ccc;
}

/* Abstract */
.abstract {
  margin: 2.5rem 0;
}

.abstract h3 {
  font-size: 1.4rem;
  margin-bottom: 0.8rem;
  border-left: 4px solid #222;
  padding-left: 0.6rem;
}

.abstract p {
  font-size: 1rem;
  text-align: justify;
  color: #333;
  line-height: 1.7;
}

/* Images */
img {
  display: block;
  margin: 2rem auto;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.1);
  max-width: 100%; /* ✅ responsive */
  height: auto;
}

/* Video */
iframe {
  display: block;
  margin: 2rem auto;
  border: none;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
  width: 100%;  /* ✅ responsive */
  max-width: 700px;
  height: 400px;
}

/* Citation box */
.citation {
  margin: 3rem 0;
}

.citation h3 {
  font-size: 1.4rem;
  margin-bottom: 0.8rem;
  border-left: 4px solid #222;
  padding-left: 0.6rem;
}

textarea {
  width: 100%;
  min-height: 160px;
  font-family: "JetBrains Mono", "Courier New", monospace;
  font-size: 0.9rem;
  padding: 1rem;
  border-radius: 8px;
  border: 1px solid #ddd;
  background: #fdfdfd;
  resize: none;
  color: #333;
}

textarea:focus {
  outline: none;
  border-color: #888;
  background: #fff;
}

/* Small improvements */
sup {
  font-size: 0.7em;
}

a {
  cursor: pointer;
}

a:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(100, 100, 255, 0.3);
}

/* ✅ Responsive adjustments */
@media (max-width: 768px) {
  .title h1 {
    font-size: 1.8rem;
  }
  .abstract h3,
  .citation h3 {
    font-size: 1.2rem;
  }
  iframe {
    height: 280px;
  }
}

@media (max-width: 480px) {
  .title {
    padding: 1.5rem 1rem;
  }
  .title h1 {
    font-size: 1.5rem;
  }
  .links {
    flex-direction: column;
    align-items: center;
  }
}