/* Levy whitepaper: long-form reading on the landing page's theme (style.css
   loads first). Printing, and the PDF made from this page, switch to light. */

:root {
  --border-strong: #3a4454;
  --code-bg: #121720;
  --warn: #e5a54b;
}

.paper {
  max-width: 760px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}

.paper h1 {
  font-size: 42px;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  text-wrap: balance;
}

.paper h2 {
  font-size: 26px;
  letter-spacing: -0.01em;
  margin: 60px 0 16px;
  scroll-margin-top: 84px;
}

.paper h3 {
  font-size: 19px;
  margin: 34px 0 10px;
  scroll-margin-top: 84px;
}

.paper p { margin: 0 0 16px; }
.paper ul, .paper ol { padding-left: 24px; margin: 0 0 16px; }
.paper li { margin: 6px 0; }
.paper strong { color: var(--text); }

.paper .lede { margin-bottom: 26px; }

.status, .note {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  font-size: 15.5px;
  margin: 0 0 24px;
}
.status { border-color: var(--accent); background: var(--accent-dim); }
.note p:last-child, .status p:last-child { margin-bottom: 0; }

.pdf-link { margin: 0 0 32px; font-size: 15.5px; }

/* Holds the arrow markers the figures share; takes no space. */
.svg-defs { position: absolute; width: 0; height: 0; overflow: hidden; }

/* Contents */

.toc {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 24px;
  margin: 0 0 12px;
}
.toc h2 { font-size: 15px; margin: 0 0 8px; color: var(--muted); letter-spacing: 0.06em; text-transform: uppercase; }
.toc ol { margin: 0; padding-left: 22px; columns: 2; column-gap: 32px; font-size: 15.5px; }
.toc li { margin: 3px 0; break-inside: avoid; }

/* Abstract */

.abstract {
  border-left: 3px solid var(--accent);
  border-radius: 0;
  padding: 2px 0 2px 20px;
  margin: 0 0 36px;
}
.abstract h2 { font-size: 15px; margin: 0 0 8px; color: var(--muted); letter-spacing: 0.06em; text-transform: uppercase; }

/* Code, formulas, tables */

.paper code {
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 0.86em;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 1px 5px;
  overflow-wrap: anywhere;
}

.paper pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
  overflow-x: auto;
  font-size: 14px;
  line-height: 1.55;
  margin: 0 0 18px;
}
.paper pre code { background: none; border: 0; padding: 0; font-size: inherit; overflow-wrap: normal; }

.formula {
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 15px;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin: 0 0 18px;
  overflow-x: auto;
  white-space: pre;
  line-height: 1.6;
}

.table-wrap { overflow-x: auto; margin: 6px 0 20px; }
.paper table { width: 100%; border-collapse: collapse; font-size: 15px; }
.paper th, .paper td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
.paper th { color: var(--muted); font-weight: 600; font-size: 14px; }
.paper td.num, .paper th.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.paper caption { caption-side: bottom; text-align: left; color: var(--muted); font-size: 14px; padding-top: 10px; }

/* Figures (inline SVG, colours from the variables so print can switch them) */

.fig { margin: 28px 0; }
.fig svg { display: block; width: 100%; height: auto; }
.fig figcaption { color: var(--muted); font-size: 14px; margin-top: 10px; }
.fig text { font-family: inherit; }
.fig .box { fill: var(--card); stroke: var(--border-strong); stroke-width: 1; }
.fig .box-acc { fill: var(--accent-dim); stroke: var(--accent); stroke-width: 1.2; }
.fig .band { fill: none; stroke: var(--border-strong); stroke-width: 1; stroke-dasharray: 4 4; }
.fig .lbl { fill: var(--text); font-size: 14px; font-weight: 600; }
.fig .sub { fill: var(--muted); font-size: 12px; }
.fig .ln { stroke: var(--muted); stroke-width: 1.5; fill: none; }
.fig .ln-acc { stroke: var(--accent); stroke-width: 1.5; fill: none; }
.fig .dash { stroke-dasharray: 5 4; }
.fig .warn-band { fill: var(--warn); opacity: 0.85; }
.fig .dot { fill: var(--bg); stroke: var(--text); stroke-width: 1.5; }
.ah { fill: var(--muted); }
.ah-acc { fill: var(--accent); }

.refs { font-size: 15px; }
.refs li { overflow-wrap: anywhere; }

.disclaimer { color: var(--muted); font-size: 14.5px; border-top: 1px solid var(--border); padding-top: 18px; margin-top: 48px; }

@media (max-width: 640px) {
  .paper { padding-top: 36px; }
  .paper h1 { font-size: 31px; }
  .paper h2 { font-size: 23px; margin-top: 48px; }
  .toc ol { columns: 1; }
  .paper pre, .formula { font-size: 12.5px; }
  .paper table { font-size: 14px; }
  .paper th, .paper td { padding: 8px 6px; }
  .paper td.num, .paper th.num { white-space: normal; }
  /* Figures keep a readable size and scroll sideways instead of shrinking. */
  .fig { overflow-x: auto; }
  .fig svg { min-width: 620px; }
}

/* Print and PDF: light theme, no site chrome, keep blocks whole. */

@page { size: A4; margin: 18mm 16mm 20mm; }

@media print {
  :root {
    --bg: #ffffff;
    --bg-alt: #f5f7fa;
    --card: #f6f8fa;
    --text: #14181d;
    --muted: #4a5361;
    --accent: #1d8a5a;
    --accent-dim: rgba(29, 138, 90, 0.09);
    --border: #d9dee5;
    --border-strong: #9aa4b2;
    --code-bg: #f3f5f8;
    --warn: #d4912c;
  }
  body { background: #fff; font-size: 10.5pt; line-height: 1.55; }
  .site-header, .site-footer, .pdf-link { display: none; }
  .paper { max-width: none; padding: 0; }
  .paper h1 { font-size: 24pt; }
  .paper h2 { font-size: 15pt; margin-top: 22pt; break-after: avoid; }
  .paper h3 { font-size: 12pt; margin-top: 14pt; break-after: avoid; }
  .paper pre, .formula { font-size: 8.8pt; white-space: pre-wrap; }
  .paper table { font-size: 9.5pt; }
  .abstract h2, .toc h2 { font-size: 9pt; margin: 0 0 6pt; }
  .table-wrap { overflow: visible; }
  .fig, .paper tr, .paper li, .paper pre, .formula, .note, .status, .toc, .abstract { break-inside: avoid; }
  .status, .note, .toc ol { font-size: 10pt; }
  .refs { font-size: 9.5pt; }
  .disclaimer, .fig figcaption, .paper caption { font-size: 9pt; }
  .disclaimer { break-inside: avoid; margin-top: 14pt; padding-top: 10pt; }
  .paper a { color: inherit; text-decoration: none; }
  .refs a { color: var(--accent); }
}