/* Paper pages on w3ft.org. Builds on site.css tokens; generated pages come
   from papers/<nn-slug>/paper.md via scripts/build_papers.py. */

.crumbs { display: flex; gap: 8px; align-items: center; font-size: 0.88rem; color: var(--muted); margin-bottom: 18px; }
.crumbs a { color: var(--muted); }

.paper-hero { border-bottom: 1px solid var(--line); background:
  radial-gradient(120% 140% at 100% 0%, color-mix(in srgb, var(--thread-b) 10%, transparent) 0%, transparent 55%),
  radial-gradient(90% 120% at 0% 0%, color-mix(in srgb, var(--thread-a) 9%, transparent) 0%, transparent 60%),
  var(--bg); }
.paper-hero .wrap { padding-top: clamp(36px, 6vw, 72px); padding-bottom: clamp(32px, 5vw, 56px); }
.paper-hero .eyebrow { margin-bottom: 12px; }
.paper-hero h1 { font-size: clamp(2.4rem, 1.6rem + 3.4vw, 4rem); letter-spacing: -0.02em; }
.paper-subtitle { font-family: var(--font-display); font-style: italic; font-size: clamp(1.2rem, 1rem + 1vw, 1.6rem); color: var(--accent); margin: 10px 0 14px; max-width: 40rem; }
.paper-byline { color: var(--ink-2); margin: 0 0 10px; }
.paper-status { color: var(--muted); font-size: 0.95rem; max-width: 46rem; }
.paper-status .pill { margin-right: 6px; vertical-align: 1px; }
.btn-meta { font: 500 0.78rem var(--font-mono); opacity: 0.75; }

.paper-layout { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: clamp(24px, 4vw, 56px); padding-top: 40px; padding-bottom: 72px; align-items: start; }
@media (max-width: 980px) { .paper-layout { grid-template-columns: minmax(0, 1fr); padding-top: 24px; } }

.paper-toc { position: sticky; top: 84px; max-height: calc(100vh - 100px); overflow: auto; font-size: 0.9rem; }
.paper-toc summary { font: 600 0.78rem var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); cursor: pointer; margin-bottom: 10px; list-style: none; }
.paper-toc summary::-webkit-details-marker { display: none; }
.paper-toc ul { list-style: none; margin: 0; padding: 0; }
.paper-toc ul ul { padding-left: 12px; margin: 2px 0 6px; border-left: 1px solid var(--line); }
.paper-toc a { display: block; padding: 4px 8px; border-radius: var(--radius-sm); color: var(--ink-2); text-decoration: none; line-height: 1.35; }
.paper-toc a:hover { background: var(--bg-2); color: var(--ink); }
.paper-toc a.active { color: var(--accent); background: var(--accent-soft); }
@media (max-width: 980px) {
  .paper-toc { position: static; max-height: none; border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; background: var(--surface); }
  .paper-toc summary { margin-bottom: 0; }
  .paper-toc details[open] summary { margin-bottom: 10px; }
}

/* Article typography */
.paper { max-width: 74ch; min-width: 0; font-size: 1.04rem; line-height: 1.72; }
.paper h2 { font-size: clamp(1.45rem, 1.2rem + 1vw, 1.85rem); margin: 2.4em 0 0.7em; scroll-margin-top: 80px; }
.paper h3 { font-size: 1.2rem; margin: 2em 0 0.6em; scroll-margin-top: 80px; }
.paper section > h2:first-child { margin-top: 2.2em; }
.paper p, .paper li { color: var(--ink-2); }
.paper strong { color: var(--ink); }
.paper ul, .paper ol { padding-left: 1.4em; }
.paper li { margin: 0.3em 0; }
.paper a { overflow-wrap: anywhere; }

.abstract { background: var(--surface); border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: var(--radius); padding: clamp(18px, 2.4vw, 26px); box-shadow: var(--shadow); }
.abstract h2 { margin: 0 0 8px !important; font: 600 0.78rem var(--font-mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); }
.abstract p { margin-bottom: 0.8em; }
.abstract .keywords { font-size: 0.9rem; color: var(--muted); margin: 0; }

/* Math */
.paper math { font-size: 1.08em; }
.paper math[display="block"] { display: block math; margin: 1.1em 0; padding: 14px 10px; overflow-x: auto; overflow-y: hidden; background: var(--bg-2); border-radius: var(--radius-sm); }

/* Figures: light plates in both themes so plotted colours stay faithful */
.paper { counter-reset: fig tab; }
.paper figure { margin: 2em 0; counter-increment: fig; }
.paper figure img { width: 100%; height: auto; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(8px, 2vw, 16px); }
.paper figcaption { margin-top: 10px; font-size: 0.9rem; line-height: 1.5; color: var(--muted); }
.paper figcaption::before { content: "Figure " counter(fig) ". "; font-weight: 700; color: var(--ink); }

/* Tables */
.table-wrap { overflow-x: auto; margin: 1.4em 0; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.paper table { width: 100%; border-collapse: collapse; font-size: 0.92rem; line-height: 1.45; }
.paper th, .paper td { padding: 10px 14px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.paper thead th { font: 600 0.74rem var(--font-mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); background: var(--bg-2); }
.paper tbody tr:last-child td { border-bottom: 0; }
.paper td[style*="right"], .paper th[style*="right"] { font-variant-numeric: tabular-nums; }

/* Code */
.paper pre { background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; overflow-x: auto; line-height: 1.6; font-size: 0.86rem; }
.paper pre code { background: none; border: 0; padding: 0; }

.paper-end { margin-top: 3em; padding-top: 1.5em; border-top: 1px solid var(--line); }
.paper-end h2 { margin-top: 0 !important; }
.paper-end pre { white-space: pre-wrap; word-break: break-word; }
.paper-fine { font-size: 0.9rem; color: var(--muted); margin-top: 1em; }

/* Papers index */
.paper-list { display: grid; gap: 18px; }
.paper-card { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 20px; align-items: start; }
@media (max-width: 640px) { .paper-card { grid-template-columns: minmax(0, 1fr); } }
.paper-num { font: 700 2.4rem/1 var(--font-display); color: var(--accent); min-width: 2ch; }
.paper-card h3 { font-size: 1.45rem; margin-bottom: 4px; }
.paper-card h3 a { color: var(--ink); text-decoration: none; }
.paper-card h3 a:hover { text-decoration: underline; }
.paper-card .sub { font-family: var(--font-display); font-style: italic; color: var(--ink-2); margin-bottom: 10px; }
.paper-card .meta { font: 0.8rem var(--font-mono); color: var(--muted); margin-bottom: 10px; }
.paper-card .actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.paper-card .actions .btn { min-height: 38px; padding: 0 14px; font-size: 0.9rem; }
.paper-card.upcoming { opacity: 0.85; box-shadow: none; background: transparent; border-style: dashed; }
.paper-card.upcoming .paper-num { color: var(--muted); }