/*
 * research-paper.css, styling for the rendered LaTeX research papers.
 * Designed to mirror docs/papers/*.html (engineering papers) so the two
 * tabs of the home page feel like a single publication.
 *
 * Pandoc emits semantic HTML; this file styles it.  Loaded AFTER reader.css
 * and (a stripped subset of) paper.css' design tokens which we duplicate
 * here so the file is self-contained.
 */

:root {
  --bg:        #ffffff;
  --bg-soft:   #f9f9f8;
  --bg-code:   #f4f4f4;
  --border:    #e5e5e5;
  --text:      #1a1a1a;
  --text-soft: #5c5c5c;
  --accent:    #c0392b;
  --accent-l:  #e74c3c;
  --blue:      #2d6be4;
  --green:     #1a7a4a;
  --yellow-bg: #fffbeb;
  --blue-bg:   #eef4ff;
  --green-bg:  #edfbf3;
  --red-bg:    #fff5f5;
  --max-w:     780px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 17px; }
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg); color: var(--text);
  line-height: 1.75; -webkit-font-smoothing: antialiased;
}

/* -- Nav (matches docs/papers/*.html) ------------------- */
nav.site-nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem; height: 58px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-brand {
  font-weight: 600; font-size: 0.95rem;
  letter-spacing: -0.02em; color: var(--text); text-decoration: none;
}
.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a {
  font-size: 0.85rem; font-weight: 500;
  color: var(--text-soft); text-decoration: none; transition: color .15s;
}
.nav-links a:hover { color: var(--text); }

/* -- Header card (mimics .hero) ------------------------- */
.paper-header {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 5rem 1.5rem 2.5rem;
  text-align: center;
  border-bottom: 1px solid var(--border);
}
.paper-header .tag {
  display: inline-block;
  font-size: 0.72rem; font-weight: 700;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent); background: var(--red-bg);
  border: 1px solid #fac5c5; border-radius: 2rem;
  padding: 0.32em 0.95em; margin-bottom: 1.4rem;
}
.paper-header h1 {
  font-size: clamp(1.75rem, 4vw, 2.6rem);
  font-weight: 700; line-height: 1.2;
  letter-spacing: -0.02em; margin-bottom: 0.7rem;
}
.paper-header .author {
  font-size: 0.95rem; color: var(--text-soft);
  margin-bottom: 0.4rem;
}
.paper-header .meta {
  font-size: 0.83rem; color: var(--text-soft);
}
.paper-header .meta a { color: var(--blue); text-decoration: none; }
.paper-header .meta a:hover { text-decoration: underline; }

/* -- Article body --------------------------------------- */
article.paper-body {
  max-width: var(--max-w); margin: 0 auto;
  padding: 2.5rem 1.5rem 5rem;
}
article.paper-body h1 { display: none; }            /* pandoc duplicates title */
article.paper-body .author,
article.paper-body .date { display: none; }

article.paper-body h2 {
  font-size: 1.45rem; font-weight: 700;
  letter-spacing: -0.015em;
  margin: 3rem 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}
article.paper-body h3 {
  font-size: 1.15rem; font-weight: 700;
  margin: 2.2rem 0 0.8rem; color: var(--text);
}
article.paper-body h4 {
  font-size: 0.98rem; font-weight: 700;
  margin: 1.6rem 0 0.5rem;
  text-transform: none; color: var(--accent);
}
article.paper-body p { margin: 0 0 1.05rem; }
article.paper-body a { color: var(--blue); text-decoration: none; }
article.paper-body a:hover { text-decoration: underline; }
article.paper-body strong { font-weight: 600; color: var(--text); }
article.paper-body em { font-style: italic; }
article.paper-body code {
  font-family: 'IBM Plex Mono', ui-monospace, SFMono-Regular, monospace;
  font-size: 0.88em;
  background: var(--bg-code);
  padding: 0.12em 0.36em;
  border-radius: 4px;
  border: 1px solid var(--border);
}
article.paper-body pre {
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem 1.2rem;
  overflow-x: auto;
  margin: 1.2rem 0;
  font-size: 0.84rem;
  line-height: 1.55;
}
article.paper-body pre code {
  background: transparent; border: 0; padding: 0; font-size: inherit;
}
article.paper-body ul, article.paper-body ol {
  margin: 0 0 1.1rem 1.4rem;
}
article.paper-body li { margin-bottom: 0.35rem; }
article.paper-body blockquote {
  border-left: 3px solid var(--accent);
  background: var(--bg-soft);
  margin: 1.2rem 0;
  padding: 0.8rem 1.1rem;
  color: var(--text-soft);
  border-radius: 0 6px 6px 0;
}
article.paper-body blockquote p:last-child { margin-bottom: 0; }

/* -- Tables --------------------------------------------- */
article.paper-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.4rem 0;
  font-size: 0.92rem;
}
article.paper-body table th,
article.paper-body table td {
  padding: 0.55rem 0.8rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
}
article.paper-body table th {
  background: var(--bg-soft);
  font-weight: 600;
  letter-spacing: -0.005em;
  border-bottom: 2px solid var(--text);
}
article.paper-body table tr:hover td { background: var(--bg-soft); }

/* -- Math display --------------------------------------- */
article.paper-body mjx-container[display="true"] {
  margin: 1.2rem 0 !important;
  overflow-x: auto;
  overflow-y: hidden;
}

/* -- Figure captions ------------------------------------ */
article.paper-body figure {
  margin: 1.6rem 0;
  text-align: center;
}
article.paper-body figure img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
}
article.paper-body figure.paper-diagram {
  background: linear-gradient(180deg, var(--bg-soft), var(--bg));
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
}
article.paper-body figure.paper-diagram svg {
  width: 100%;
  height: auto;
}
article.paper-body figure.paper-diagram .box {
  fill: var(--bg);
  stroke: var(--border);
  stroke-width: 2;
}
article.paper-body figure.paper-diagram .accent {
  fill: var(--red-bg);
  stroke: var(--accent);
}
article.paper-body figure.paper-diagram .support {
  fill: var(--blue-bg);
  stroke: var(--blue);
}
article.paper-body figure.paper-diagram .good {
  fill: var(--green-bg);
  stroke: var(--green);
}
article.paper-body figure.paper-diagram .arrow {
  stroke: var(--text-soft);
  stroke-width: 2.5;
  fill: none;
  marker-end: url(#arrowhead);
}
article.paper-body figure.paper-diagram text {
  fill: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
}
article.paper-body figure.paper-diagram .small {
  font-size: 18px;
  fill: var(--text-soft);
}
article.paper-body figure.paper-diagram .label {
  font-size: 22px;
  font-weight: 700;
}
article.paper-body figcaption {
  font-size: 0.85rem;
  color: var(--text-soft);
  margin-top: 0.6rem;
}

/* -- Pandoc-emitted environments ------------------------ */
article.paper-body .htnote,
article.paper-body div.htnote,
article.paper-body div[role="note"] {
  background: var(--blue-bg);
  border: 1px solid #c3d4f4;
  border-left: 3px solid var(--blue);
  border-radius: 0 6px 6px 0;
  padding: 0.85rem 1.1rem;
  margin: 1.2rem 0;
  font-size: 0.94rem;
}
article.paper-body .htwarn { background: var(--yellow-bg); border-left-color: #d4a017; }
article.paper-body .htgood { background: var(--green-bg); border-left-color: var(--green); }

/* -- Footer --------------------------------------------- */
footer.paper-footer {
  max-width: var(--max-w); margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
  font-size: 0.83rem; color: var(--text-soft);
  border-top: 1px solid var(--border);
}
footer.paper-footer a { color: var(--blue); text-decoration: none; }

/* -- References list ------------------------------------ */
article.paper-body #refs,
article.paper-body div.csl-entry {
  font-size: 0.9rem;
  line-height: 1.55;
}
article.paper-body div.csl-entry { margin-bottom: 0.5rem; }