/* Cross Domain Reasoning Scientific Paper Styling - paper.css */

/* Reading Progress Bar */
.reading-progress-container {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  height: 3px;
  background: transparent;
  z-index: 99;
}

.reading-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  transition: width 0.1s ease-out;
}

/* Paper Container Layout */
.paper-wrapper {
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 5rem;
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 3rem;
  align-items: start;
}

/* Sidebar / Table of Contents */
.paper-sidebar {
  position: sticky;
  top: calc(var(--header-height) + 2rem);
  max-height: calc(100vh - var(--header-height) - 4rem);
  overflow-y: auto;
  padding-right: 0.5rem;
  font-size: 0.85rem;
  scrollbar-width: thin;
}

.paper-sidebar::-webkit-scrollbar {
  width: 4px;
}

.paper-sidebar::-webkit-scrollbar-thumb {
  background-color: var(--border-light);
  border-radius: 4px;
}

.toc-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border-light);
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0;
  margin: 0 0 1.5rem 0;
}

.toc-item {
  line-height: 1.35;
}

.toc-item.level-2 {
  padding-left: 0.75rem;
  font-size: 0.82rem;
}

.toc-item.level-3 {
  padding-left: 1.5rem;
  font-size: 0.78rem;
}

.toc-link {
  color: var(--text-secondary);
  display: block;
  padding: 0.25rem 0.4rem;
  border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  transition: all 0.15s ease;
  text-decoration: none;
}

.toc-link:hover {
  color: var(--accent-secondary);
  background-color: var(--bg-secondary);
  text-decoration: none;
}

.toc-link.active {
  color: var(--accent-secondary);
  font-weight: 600;
  border-left-color: var(--accent-secondary);
  background-color: var(--accent-badge);
}

.sidebar-actions {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-light);
}

.sidebar-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
}

.sidebar-btn:hover {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border-dark);
  text-decoration: none;
}

/* Paper Main Content */
.paper-content {
  max-width: var(--paper-max-width);
  min-width: 0;
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-primary);
}

/* Paper Header Block */
.paper-header {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-light);
  font-family: var(--font-sans);
}

.paper-meta-top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.paper-headline {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
}

.paper-authors-block {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.author-item {
  display: flex;
  flex-direction: column;
}

.author-name {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
}

.author-affiliation {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.paper-info-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  margin-top: 1rem;
}

.info-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.info-label {
  font-weight: 600;
  color: var(--text-muted);
}

/* Abstract Box */
.paper-abstract-box {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-left: 3px solid var(--accent-primary);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.75rem;
  margin-bottom: 2.5rem;
  box-shadow: var(--shadow-sm);
}

.abstract-title {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  margin-bottom: 0.6rem;
}

.abstract-text {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-secondary);
  font-style: normal;
}

.abstract-keywords {
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--border-light);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--text-muted);
}

.keywords-list {
  color: var(--text-secondary);
  font-weight: 500;
}

/* Headings */
.paper-content h1,
.paper-content h2,
.paper-content h3,
.paper-content h4 {
  font-family: var(--font-sans);
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.3;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  scroll-margin-top: calc(var(--header-height) + 1.5rem);
}

.paper-content h2 {
  font-size: 1.5rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.4rem;
}

.paper-content h3 {
  font-size: 1.25rem;
  margin-top: 2rem;
}

.paper-content h4 {
  font-size: 1.05rem;
  margin-top: 1.5rem;
}

/* Paragraphs & Text */
.paper-content p {
  margin-bottom: 1.25rem;
}

.paper-content ul, .paper-content ol {
  margin: 0.75rem 0 1.25rem 1.75rem;
}

.paper-content li {
  margin-bottom: 0.4rem;
}

.paper-content blockquote {
  border-left: 3px solid var(--accent-secondary);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  background: var(--bg-secondary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--text-secondary);
  font-style: italic;
}

/* Scientific & Academic Callout Boxes */
.callout {
  padding: 1.25rem 1.5rem;
  margin: 1.75rem 0;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-size: 0.95rem;
}

.callout-title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.callout-info {
  background: var(--callout-info-bg);
  border-color: var(--callout-info-border);
  color: var(--text-primary);
}

.callout-info .callout-title {
  color: var(--accent-secondary);
}

.callout-warning {
  background: var(--callout-warning-bg);
  border-color: var(--callout-warning-border);
  color: var(--text-primary);
}

.callout-warning .callout-title {
  color: #b45309;
}

[data-theme="dark"] .callout-warning .callout-title {
  color: #f59e0b;
}

.callout-danger {
  background: var(--callout-danger-bg);
  border-color: var(--callout-danger-border);
  color: var(--text-primary);
}

.callout-danger .callout-title {
  color: #b91c1c;
}

[data-theme="dark"] .callout-danger .callout-title {
  color: #ef4444;
}

.callout-keyfinding {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-left: 4px solid var(--accent-primary);
  box-shadow: var(--shadow-sm);
}

.callout-keyfinding .callout-title {
  color: var(--accent-primary);
}

/* Math Environments - Clean Academic Display */
.math-block {
  margin: 1.25rem 0;
  padding: 0.25rem 0;
  background: transparent;
  border: none;
  border-radius: 0;
  overflow-x: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.math-content {
  flex: 1;
  text-align: center;
  overflow-x: auto;
  font-size: 1.05em;
}

.math-eq-num {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--text-muted);
  font-style: normal;
  user-select: none;
  white-space: nowrap;
}

/* Tables (Academic Booktabs Style) */
.table-container {
  margin: 2rem 0;
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  background: var(--bg-card);
}

.paper-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  text-align: left;
}

.paper-table caption {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-align: left;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-light);
}

.paper-table th {
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-weight: 600;
  padding: 0.65rem 1rem;
  border-bottom: 2px solid var(--border-dark);
}

.paper-table td {
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-secondary);
}

.paper-table tbody tr:last-child td {
  border-bottom: 2px solid var(--border-dark);
}

.paper-table tbody tr:hover td {
  background-color: var(--bg-secondary);
}

.paper-table .highlight-row td {
  background-color: var(--accent-badge);
  font-weight: 600;
  color: var(--accent-badge-text);
}

.paper-table td.num, .paper-table th.num {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* Algorithms / Pseudocode Blocks */
.algorithm-block {
  margin: 2rem 0;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  overflow: hidden;
  font-family: var(--font-sans);
}

.algorithm-header {
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border-bottom: 2px solid var(--border-dark);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.algorithm-title {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.algorithm-content {
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.6;
  background: var(--bg-card);
  overflow-x: auto;
}

.algo-line {
  display: flex;
}

.algo-num {
  color: var(--text-muted);
  width: 2.2rem;
  text-align: right;
  padding-right: 0.75rem;
  user-select: none;
  flex-shrink: 0;
}

.algo-text {
  color: var(--text-primary);
}

.algo-kw {
  color: #a855f7;
  font-weight: 600;
}

.algo-fn {
  color: var(--accent-secondary);
  font-weight: 600;
}

.algo-comment {
  color: var(--text-muted);
  font-style: italic;
}

/* Figures & Visual Diagrams */
.figure-container {
  margin: 2rem 0;
  text-align: center;
}

.figure-diagram {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin: 0 auto;
  max-width: 760px;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  box-shadow: var(--shadow-sm);
}

.figure-step {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  line-height: 1.5;
  padding: 0.6rem 0.85rem;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  color: var(--text-secondary);
}

.figure-step.highlight {
  background: var(--accent-badge);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
}

.figure-step .step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-secondary);
  color: #ffffff;
  font-weight: 700;
  font-size: 0.75rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.figure-arrow {
  text-align: center;
  color: var(--text-muted);
  font-size: 1.1rem;
  line-height: 1;
}

.figure-caption {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
  text-align: center;
  line-height: 1.5;
}

.figure-caption strong {
  color: var(--text-primary);
}

/* Code Blocks & Traces */
.code-block-container {
  margin: 1.5rem 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  background: var(--bg-code);
  overflow: hidden;
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.4rem 0.85rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-light);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.code-lang {
  font-weight: 600;
  text-transform: uppercase;
}

.copy-btn {
  background: transparent;
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.copy-btn:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

pre {
  margin: 0;
  padding: 1rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-primary);
}

code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background-color: var(--bg-code);
  padding: 0.15em 0.35em;
  border-radius: 3px;
  border: 1px solid var(--border-light);
}

pre code {
  background-color: transparent;
  padding: 0;
  border: none;
  font-size: 1em;
}

/* References Section */
.references-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  line-height: 1.55;
}

.ref-item {
  margin-bottom: 1rem;
  padding-left: 2rem;
  text-indent: -2rem;
}

.ref-label {
  font-weight: 600;
  color: var(--accent-secondary);
}

.citation-link {
  font-family: var(--font-sans);
  font-size: 0.85em;
  font-weight: 600;
  color: var(--accent-secondary);
  vertical-align: super;
  text-decoration: none;
  padding: 0 0.15rem;
}

/* BibTeX Box */
.bibtex-box {
  background: var(--bg-code);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  margin: 2rem 0;
  overflow: hidden;
}

.bibtex-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 1rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-light);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
}

/* Responsive adjustments */
@media (max-width: 960px) {
  .paper-wrapper {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  
  .paper-sidebar {
    display: none; /* Can be toggled with mobile TOC button */
  }
  
  .paper-headline {
    font-size: 1.85rem;
  }
}