/* tombelfort.com — Broadsheet Print Monograph stylesheet. All classes and custom properties carry the tbf- prefix. */
:root {
  --tbf-newsprint: #F5F2EB;
  --tbf-ink: #0D0D0D;
  --tbf-oxide: #991B1B;
  --tbf-rule: #D6D3CD;
  --tbf-parchment: #EBE6DA;
  --tbf-ink-soft: #3D3A36;
  --tbf-ink-muted: #6B6560;
  --tbf-serif: "Playfair Display", "Iowan Old Style", Georgia, serif;
  --tbf-sans: "Karla", "Helvetica Neue", Arial, sans-serif;
  --tbf-mono: "Cousine", "Courier New", monospace;
  --tbf-measure: 38rem;
  --tbf-margin: 17rem;
  --tbf-gutter: 2.5rem;
  --tbf-lab-delivered: #991B1B;
  --tbf-lab-damping: #1B6FB0;
  --tbf-lab-dilution: #A8701A;
  --tbf-lab-mismatch: #6E4FB0;
  --tbf-lab-tier: #6B6560;
}

*, *::before, *::after { box-sizing: border-box; }
html { background: var(--tbf-newsprint); color: var(--tbf-ink); -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body.tbf-body {
  margin: 0;
  font-family: var(--tbf-sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  background:
    radial-gradient(circle at 15% 0%, rgba(13,13,13,0.025), transparent 45%),
    var(--tbf-newsprint);
}
a { color: inherit; text-decoration-color: var(--tbf-oxide); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { color: var(--tbf-oxide); }
code, pre { font-family: var(--tbf-mono); font-size: 0.86em; }
code { background: var(--tbf-parchment); padding: 0.05em 0.3em; border-radius: 2px; }
img, svg { max-width: 100%; }

.tbf-skip { position: absolute; left: -999px; top: 0; background: var(--tbf-ink); color: var(--tbf-newsprint); padding: 0.5rem 1rem; z-index: 10; }
.tbf-skip:focus { left: 1rem; top: 1rem; }

/* ---------- masthead ---------- */
.tbf-masthead {
  max-width: calc(var(--tbf-measure) + var(--tbf-margin) + var(--tbf-gutter) + 4rem);
  margin: 0 auto;
  padding: 1.25rem 2rem 0;
  text-align: center;
  border-bottom: 3px double var(--tbf-ink);
}
.tbf-masthead-ears {
  display: flex; justify-content: space-between; gap: 1rem; white-space: nowrap;
  font-family: var(--tbf-mono); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--tbf-ink-muted); border-bottom: 1px solid var(--tbf-rule); padding-bottom: 0.5rem;
}
.tbf-nameplate {
  font-family: var(--tbf-serif); font-weight: 800; font-size: clamp(2.6rem, 7vw, 4.75rem);
  letter-spacing: -0.02em; line-height: 1; margin: 1rem 0 0.35rem;
}
.tbf-nameplate a { text-decoration: none; }
.tbf-nameplate a:hover { color: var(--tbf-ink); }
.tbf-masthead-tagline {
  margin: 0 0 0.9rem; font-family: var(--tbf-sans); font-weight: 500; font-size: 0.8rem;
  letter-spacing: 0.22em; text-transform: uppercase; color: var(--tbf-ink-soft);
}
.tbf-nav { border-top: 1px solid var(--tbf-ink); }
.tbf-nav ul { list-style: none; margin: 0; padding: 0.55rem 0; display: flex; flex-wrap: wrap; justify-content: center; gap: 0.2rem 1.4rem; }
.tbf-nav a { font-size: 0.78rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; text-decoration: none; }
.tbf-nav a[aria-current="page"] { color: var(--tbf-oxide); border-bottom: 2px solid var(--tbf-oxide); }

/* ---------- broadsheet grid ---------- */
.tbf-broadsheet {
  max-width: calc(var(--tbf-measure) + var(--tbf-margin) + var(--tbf-gutter) + 4rem);
  margin: 0 auto; padding: 2.5rem 2rem 4rem;
}
.tbf-monograph { position: relative; max-width: var(--tbf-measure); counter-reset: tbf-figure; }
.tbf-monograph-head { margin-bottom: 2rem; }
.tbf-rubric {
  font-family: var(--tbf-mono); font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--tbf-oxide); margin: 0 0 0.6rem;
}
.tbf-headline {
  font-family: var(--tbf-serif); font-weight: 800; font-size: clamp(2rem, 5vw, 3.1rem);
  line-height: 1.08; letter-spacing: -0.015em; margin: 0 0 0.8rem;
}
.tbf-dek { font-size: 1.25rem; line-height: 1.45; color: var(--tbf-ink-soft); margin: 0 0 0.9rem; font-weight: 400; }
.tbf-byline { font-size: 0.85rem; color: var(--tbf-ink-muted); margin: 0 0 1.4rem; padding-top: 0.6rem; border-top: 1px solid var(--tbf-rule); }

/* ---------- essay prose ---------- */
.tbf-essay > p, .tbf-essay > ul, .tbf-essay > ol { max-width: var(--tbf-measure); }
.tbf-essay p { margin: 0 0 1.2rem; }
.tbf-essay > p:first-of-type::first-letter {
  font-family: var(--tbf-serif); font-weight: 800; font-size: 3.6em; float: left; line-height: 0.8;
  padding: 0.08em 0.1em 0 0; color: var(--tbf-oxide);
}
.tbf-essay h2 {
  font-family: var(--tbf-serif); font-weight: 700; font-size: 1.55rem; line-height: 1.2;
  margin: 2.4rem 0 0.9rem; padding-top: 0.9rem; border-top: 1px solid var(--tbf-ink);
}
.tbf-essay h3 { font-family: var(--tbf-sans); font-weight: 700; font-size: 1.05rem; letter-spacing: 0.02em; margin: 1.8rem 0 0.6rem; }
.tbf-essay ul, .tbf-essay ol { padding-left: 1.3rem; margin: 0 0 1.2rem; }
.tbf-essay li { margin-bottom: 0.45rem; }
.tbf-essay li::marker { color: var(--tbf-oxide); font-weight: 700; }
.tbf-essay blockquote {
  margin: 1.6rem 0; padding: 0.2rem 0 0.2rem 1.2rem; border-left: 3px solid var(--tbf-oxide);
  font-family: var(--tbf-serif); font-size: 1.15rem; line-height: 1.45; color: var(--tbf-ink-soft);
}
.tbf-essay strong { font-weight: 700; }
.tbf-pull { font-family: var(--tbf-serif); font-size: 1.3rem; line-height: 1.35; color: var(--tbf-ink); border-top: 1px solid var(--tbf-ink); border-bottom: 1px solid var(--tbf-ink); padding: 1rem 0; margin: 1.8rem 0; }

/* ---------- formula blocks ---------- */
.tbf-formula {
  margin: 1.5rem 0; padding: 1rem 1.2rem; background: var(--tbf-parchment);
  border-left: 3px solid var(--tbf-oxide); overflow-x: auto;
}
.tbf-formula code { background: none; padding: 0; font-size: 0.95rem; color: var(--tbf-ink); white-space: pre-wrap; display: block; line-height: 1.6; }
.tbf-formula-note { font-size: 0.82rem; color: var(--tbf-ink-muted); margin: 0.5rem 0 0; font-family: var(--tbf-sans); }
.tbf-var { color: var(--tbf-oxide); font-weight: 700; }

/* ---------- tables ---------- */
.tbf-patent-table, .tbf-table, .tbf-lab-table {
  width: 100%; border-collapse: collapse; font-size: 0.9rem; margin: 1.2rem 0 1.8rem;
  border-top: 2px solid var(--tbf-ink); border-bottom: 2px solid var(--tbf-ink);
}
.tbf-patent-table th, .tbf-table th, .tbf-lab-table th { text-align: left; font-weight: 700; padding: 0.5rem 0.6rem; vertical-align: top; }
.tbf-patent-table td, .tbf-table td, .tbf-lab-table td { padding: 0.5rem 0.6rem; vertical-align: top; border-top: 1px solid var(--tbf-rule); }
.tbf-patent-table th[scope="row"] { width: 9rem; font-family: var(--tbf-mono); font-size: 0.74rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--tbf-ink-muted); border-top: 1px solid var(--tbf-rule); }
.tbf-table thead th { border-bottom: 1px solid var(--tbf-ink); font-family: var(--tbf-mono); font-size: 0.74rem; letter-spacing: 0.06em; text-transform: uppercase; }
.tbf-table td code, .tbf-patent-table td code { white-space: nowrap; }
.tbf-table-wide, .tbf-figure-wide, .tbf-lead-grid, .tbf-lab { width: calc(var(--tbf-measure) + var(--tbf-margin) + var(--tbf-gutter)); max-width: none; }
.tbf-num { font-family: var(--tbf-mono); text-align: right; font-variant-numeric: tabular-nums; }
.tbf-caption, figcaption.tbf-caption, caption.tbf-caption {
  font-size: 0.82rem; line-height: 1.5; color: var(--tbf-ink-muted); text-align: left; caption-side: bottom; padding: 0.5rem 0 0;
}

/* ---------- figures ---------- */
.tbf-figure { margin: 2rem 0; padding: 0; counter-increment: tbf-figure; }
.tbf-figure-plate { background: var(--tbf-parchment); padding: 1.2rem; border: 1px solid var(--tbf-rule); }
.tbf-figure-plate svg { display: block; width: 100%; height: auto; }

/* ---------- Tufte sidenotes ---------- */
.tbf-sidenote-number {
  cursor: pointer; font-family: var(--tbf-mono); font-size: 0.7rem; color: var(--tbf-oxide); font-weight: 700;
  vertical-align: super; line-height: 0; margin-left: 0.1em; user-select: none;
}
.tbf-sidenote-toggle { display: none; }
.tbf-sidenote {
  float: right; clear: right; width: var(--tbf-margin);
  margin-right: calc(-1 * (var(--tbf-margin) + var(--tbf-gutter)));
  margin-top: 0.3rem; margin-bottom: 0.9rem;
  font-size: 0.8rem; line-height: 1.45; color: var(--tbf-ink-soft); position: relative;
}
.tbf-sidenote-index { font-family: var(--tbf-mono); color: var(--tbf-oxide); font-weight: 700; font-size: 0.72rem; margin-right: 0.35em; }
.tbf-sidenote code { font-size: 0.82em; }

@media (max-width: 1080px) {
  .tbf-sidenote { display: none; }
  .tbf-sidenote-toggle:checked + .tbf-sidenote {
    display: block; float: none; width: auto; margin: 0.6rem 0 1rem; padding: 0.6rem 0.8rem;
    background: var(--tbf-parchment); border-left: 2px solid var(--tbf-oxide);
  }
  .tbf-figure-wide, .tbf-table-wide, .tbf-lead-grid, .tbf-lab { width: 100%; max-width: 100%; }
  .tbf-monograph { max-width: 100%; }
}

/* ---------- broadsheet index ---------- */
.tbf-index { margin-top: 3.5rem; padding-top: 1.2rem; border-top: 3px double var(--tbf-ink); }
.tbf-section-heading { font-family: var(--tbf-serif); font-weight: 800; font-size: 1.6rem; margin: 0 0 1.2rem; }
.tbf-index-grid {
  list-style: none; margin: 0; padding: 0;
  column-count: 3; column-gap: 2rem; column-rule: 1px solid var(--tbf-rule);
}
.tbf-index-item { break-inside: avoid; margin-bottom: 1.6rem; padding-bottom: 1rem; border-bottom: 1px solid var(--tbf-rule); }
.tbf-index-title { font-family: var(--tbf-serif); font-weight: 700; font-size: 1.15rem; line-height: 1.25; margin: 0 0 0.4rem; }
.tbf-index-title a { text-decoration: none; }
.tbf-index-title a:hover { text-decoration: underline; }
.tbf-index-dek { font-size: 0.9rem; color: var(--tbf-ink-soft); margin: 0 0 0.4rem; }
.tbf-index-meta { font-family: var(--tbf-mono); font-size: 0.7rem; color: var(--tbf-ink-muted); margin: 0; }
@media (max-width: 900px) { .tbf-index-grid { column-count: 2; } }
@media (max-width: 600px) { .tbf-index-grid { column-count: 1; } }

/* ---------- front-page leads ---------- */
.tbf-lead-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.6rem 2rem; margin: 1.5rem 0 2rem; }
.tbf-lead { border-top: 1px solid var(--tbf-ink); padding-top: 0.8rem; }
.tbf-lead h3 { font-family: var(--tbf-serif); font-size: 1.25rem; line-height: 1.25; margin: 0.2rem 0 0.5rem; }
.tbf-lead h3 a { text-decoration: none; }
.tbf-lead h3 a:hover { text-decoration: underline; }
.tbf-lead p { font-size: 0.95rem; margin: 0 0 0.4rem; }
@media (max-width: 700px) { .tbf-lead-grid { grid-template-columns: 1fr; } }

.tbf-notes { list-style: none; padding: 0; margin: 0 0 1.5rem; }
.tbf-notes li { padding: 0.7rem 0; border-top: 1px dashed var(--tbf-rule); font-size: 0.95rem; }
.tbf-notes time { font-family: var(--tbf-mono); font-size: 0.72rem; color: var(--tbf-oxide); display: block; letter-spacing: 0.08em; }

/* ---------- interactive lab ---------- */
.tbf-lab {
  background: var(--tbf-parchment); border: 1px solid var(--tbf-rule); border-top: 3px solid var(--tbf-ink);
  padding: 1.4rem 1.6rem 1.2rem; margin: 1.8rem 0 2.2rem;
}
.tbf-lab-title { font-family: var(--tbf-serif); font-weight: 800; font-size: 1.6rem; margin: 0 0 0.5rem; line-height: 1.15; }
.tbf-lab-dek { font-size: 0.95rem; color: var(--tbf-ink-soft); margin: 0 0 1.2rem; max-width: 46rem; }
.tbf-lab-controls { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem 2rem; margin-bottom: 1.4rem; }
.tbf-lab-control { display: grid; grid-template-columns: 1fr auto; gap: 0.25rem 0.8rem; align-items: center; border: 0; padding: 0; margin: 0; min-width: 0; }
.tbf-lab-control > label, .tbf-lab-control > legend { grid-column: 1 / -1; font-size: 0.82rem; font-weight: 700; letter-spacing: 0.02em; }
.tbf-lab-control code { font-weight: 400; font-size: 0.74rem; background: var(--tbf-newsprint); margin-left: 0.3em; }
.tbf-lab-control input[type="range"] { width: 100%; accent-color: var(--tbf-oxide); margin: 0; }
.tbf-lab-control output { font-family: var(--tbf-mono); font-size: 0.95rem; min-width: 3.4rem; text-align: right; font-variant-numeric: tabular-nums; }
.tbf-lab-tier { display: block; }
.tbf-lab-tier legend { padding: 0; margin-bottom: 0.35rem; }
.tbf-lab-tier label { display: inline-flex; align-items: center; gap: 0.35rem; margin: 0.2rem 1.1rem 0 0; font-size: 0.9rem; cursor: pointer; }
.tbf-lab-tier input { accent-color: var(--tbf-oxide); }
.tbf-lab-readout { border-top: 1px solid var(--tbf-ink); padding-top: 1rem; }
.tbf-lab-hero { display: grid; grid-template-columns: auto; margin-bottom: 0.9rem; }
.tbf-lab-hero-label { font-family: var(--tbf-mono); font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--tbf-ink-muted); }
.tbf-lab-hero-value { font-family: var(--tbf-serif); font-weight: 800; font-size: 3rem; line-height: 1; color: var(--tbf-ink); font-variant-numeric: tabular-nums; }
.tbf-lab-hero-sub { font-size: 0.9rem; color: var(--tbf-ink-soft); }
.tbf-lab-bar-wrap { position: relative; }
.tbf-lab-bar { display: block; width: 100%; height: 44px; }
.tbf-lab-bar rect.tbf-lab-seg { cursor: pointer; }
.tbf-lab-tip {
  position: absolute; top: -2.4rem; left: 0; transform: translateX(-50%);
  background: var(--tbf-ink); color: var(--tbf-newsprint); font-size: 0.78rem; font-family: var(--tbf-mono);
  padding: 0.3rem 0.55rem; white-space: nowrap; pointer-events: none; border-radius: 2px;
}
.tbf-lab-tip::after { content: ""; position: absolute; left: 50%; bottom: -5px; margin-left: -5px; border: 5px solid transparent; border-bottom: 0; border-top-color: var(--tbf-ink); }
.tbf-lab-legend { list-style: none; display: flex; flex-wrap: wrap; gap: 0.4rem 1.4rem; padding: 0; margin: 0.8rem 0 0.4rem; font-size: 0.85rem; }
.tbf-lab-legend li { display: inline-flex; align-items: center; gap: 0.45rem; }
.tbf-lab-swatch { width: 12px; height: 12px; border-radius: 2px; display: inline-block; flex: none; }
.tbf-lab-swatch-tier { background: repeating-linear-gradient(45deg, var(--tbf-lab-tier) 0 2px, var(--tbf-newsprint) 2px 5px); }
.tbf-lab-legend-value { font-family: var(--tbf-mono); color: var(--tbf-ink-soft); font-variant-numeric: tabular-nums; }
.tbf-lab-table { margin: 0.8rem 0 0.6rem; background: var(--tbf-newsprint); }
.tbf-lab-table td:nth-child(2), .tbf-lab-table td:nth-child(3), .tbf-lab-table th:nth-child(2), .tbf-lab-table th:nth-child(3) { text-align: right; font-family: var(--tbf-mono); font-variant-numeric: tabular-nums; }
.tbf-lab-verdict { font-size: 0.95rem; margin: 0.8rem 0 0; padding: 0.8rem 1rem; background: var(--tbf-newsprint); border-left: 3px solid var(--tbf-oxide); }
.tbf-lab-flag { font-family: var(--tbf-mono); font-size: 0.78rem; color: var(--tbf-oxide); font-weight: 700; }
@media (max-width: 600px) { .tbf-masthead-ears .tbf-ear:nth-child(2) { display: none; } }
@media (max-width: 760px) { .tbf-lab-controls { grid-template-columns: 1fr; } .tbf-lab { padding: 1.1rem 1rem; } .tbf-lab-hero-value { font-size: 2.3rem; } }

/* ---------- monograph foot & colophon ---------- */
.tbf-monograph-foot { margin-top: 2.5rem; padding-top: 1rem; border-top: 1px solid var(--tbf-ink); font-size: 0.88rem; color: var(--tbf-ink-soft); }
.tbf-colophon {
  max-width: calc(var(--tbf-measure) + var(--tbf-margin) + var(--tbf-gutter) + 4rem);
  margin: 0 auto; padding: 1.5rem 2rem 2.5rem; border-top: 3px double var(--tbf-ink); font-size: 0.88rem; color: var(--tbf-ink-soft);
}
.tbf-colophon-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.tbf-colophon-grid p { margin: 0 0 0.5rem; }
.tbf-colophon-name { font-family: var(--tbf-serif); font-weight: 800; font-size: 1.3rem; color: var(--tbf-ink); }
.tbf-colophon-links { list-style: none; margin: 0; padding: 0; }
.tbf-colophon-links li { margin-bottom: 0.3rem; }
.tbf-colophon-legal { margin: 1.5rem 0 0; padding-top: 0.8rem; border-top: 1px solid var(--tbf-rule); font-family: var(--tbf-mono); font-size: 0.7rem; letter-spacing: 0.06em; color: var(--tbf-ink-muted); }
@media (max-width: 760px) { .tbf-colophon-grid { grid-template-columns: 1fr; gap: 1.2rem; } }

/* ---------- print ---------- */
@media print {
  .tbf-nav, .tbf-lab-controls, .tbf-skip { display: none; }
  body.tbf-body { background: #fff; font-size: 10.5pt; }
  .tbf-sidenote { font-size: 8pt; }
  a { text-decoration: none; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }