/* ============================================================
   paper.css — Academic paper rendering page
   Scoped to .paper-* to avoid collisions
   ============================================================ */

.paper-page {
  padding: 40px 0 120px;
  background: #fcfbf8;
  min-height: calc(100vh - 120px);
}

.paper-container {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px;
}

.paper-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: #808080;
  margin-bottom: 32px;
}

.paper-breadcrumb a {
  color: #d97757;
  text-decoration: none;
  border-bottom: 1px dashed rgba(217, 119, 87, 0.4);
}

.paper-breadcrumb a:hover {
  border-bottom-color: #d97757;
}

.paper-breadcrumb__sep {
  color: #ccc;
}

.paper-breadcrumb__current {
  color: #555;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.02em;
}

/* --- Main article --- */

.paper-article {
  background: #fff;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 6px;
  padding: 64px 72px 72px;
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.03);
  font-family: 'Crimson Pro', 'Noto Serif SC', Georgia, serif;
  font-size: 17px;
  line-height: 1.75;
  color: #1d1d1d;
}

.paper-article h1 {
  font-family: 'Crimson Pro', Georgia, serif;
  font-size: 30px;
  font-weight: 600;
  line-height: 1.28;
  margin: 0 0 16px;
  letter-spacing: -0.005em;
  color: #111;
}

.paper-article h2 {
  font-family: 'Inter', sans-serif;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.005em;
  margin: 48px 0 16px;
  padding-bottom: 6px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  color: #111;
}

.paper-article h3 {
  font-family: 'Inter', sans-serif;
  font-size: 16.5px;
  font-weight: 600;
  margin: 32px 0 10px;
  color: #222;
}

.paper-article h4 {
  font-family: 'Inter', sans-serif;
  font-size: 14.5px;
  font-weight: 600;
  margin: 22px 0 8px;
  color: #333;
}

.paper-article p {
  margin: 0 0 16px;
  text-align: justify;
  hyphens: auto;
}

.paper-article p:first-of-type {
  font-size: 16.5px;
}

.paper-article strong {
  color: #111;
  font-weight: 600;
}

.paper-article em {
  font-style: italic;
  color: #333;
}

.paper-article a {
  color: #80492a;
  text-decoration: none;
  border-bottom: 1px solid rgba(128, 73, 42, 0.4);
}

.paper-article a:hover {
  border-bottom-color: #80492a;
  color: #60361f;
}

/* --- Horizontal rule --- */
.paper-article hr {
  border: none;
  height: 1px;
  background: rgba(0, 0, 0, 0.1);
  margin: 32px 0;
}

/* --- Abstract + author block (first-section styling) --- */

.paper-article > p:first-of-type strong:first-child {
  /* Author line */
  display: inline;
}

/* --- Code --- */

.paper-article code {
  font-family: 'JetBrains Mono', 'SF Mono', Menlo, monospace;
  font-size: 13.5px;
  background: #f4f2ed;
  color: #6a4a25;
  padding: 1px 6px;
  border-radius: 3px;
}

.paper-article pre {
  background: #f8f6f0;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 6px;
  padding: 16px 18px;
  overflow-x: auto;
  margin: 18px 0;
  font-size: 13px;
  line-height: 1.65;
}

.paper-article pre code {
  background: transparent;
  color: #333;
  padding: 0;
  font-size: 13px;
}

/* --- Lists --- */

.paper-article ul,
.paper-article ol {
  padding-left: 26px;
  margin: 12px 0 20px;
}

.paper-article li {
  margin-bottom: 6px;
  line-height: 1.7;
}

/* --- Blockquote --- */

.paper-article blockquote {
  margin: 20px 0;
  padding: 14px 22px;
  background: rgba(217, 119, 87, 0.07);
  border-left: 3px solid rgba(217, 119, 87, 0.5);
  border-radius: 0 6px 6px 0;
  font-style: italic;
  color: #444;
}

.paper-article blockquote p {
  margin: 0 0 8px;
}

.paper-article blockquote p:last-child {
  margin: 0;
}

/* --- Tables --- */

.paper-article table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0 24px;
  font-size: 14.5px;
  font-family: 'Inter', sans-serif;
}

.paper-article th,
.paper-article td {
  padding: 8px 14px;
  text-align: left;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.paper-article th {
  background: #faf9f6;
  font-weight: 600;
  color: #333;
  border-bottom: 2px solid rgba(0, 0, 0, 0.15);
}

.paper-article tbody tr:last-child td {
  border-bottom: 1px solid rgba(0, 0, 0, 0.15);
}

/* --- KaTeX math spacing --- */

.paper-article .katex-display {
  margin: 20px 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.paper-article .katex {
  font-size: 1em;
}

/* --- Skeleton loader --- */

.paper-skeleton {
  padding: 20px 0 40px;
}

.paper-skeleton__line {
  height: 18px;
  background: linear-gradient(90deg, #f5f2eb 0%, #faf7f0 50%, #f5f2eb 100%);
  background-size: 200% 100%;
  border-radius: 4px;
  margin-bottom: 12px;
  animation: paper-shimmer 1.5s ease infinite;
}

.paper-skeleton__line--title {
  height: 36px;
  width: 75%;
  margin-bottom: 22px;
}

.paper-skeleton__line--short {
  width: 55%;
}

@keyframes paper-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* --- Footer actions --- */

.paper-footer-actions {
  margin-top: 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.paper-action {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 500;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 999px;
  background: #fff;
  color: #444;
  text-decoration: none;
  transition: all 0.18s ease;
  font-family: 'Inter', sans-serif;
}

.paper-action:hover {
  border-color: rgba(217, 119, 87, 0.5);
  color: #80492a;
}

/* --- Responsive --- */

@media (max-width: 720px) {
  .paper-article { padding: 36px 24px 48px; font-size: 16px; }
  .paper-article h1 { font-size: 24px; }
  .paper-article h2 { font-size: 18px; }
  .paper-article p { text-align: left; }
}