/* ============================================================
   SPR Biosensor — Companion Site
   Publication palette: warm parchment, deep ink, muted sienna
   Typography: serif display + serif body, monospaced numerics
   ============================================================ */

:root {
  --paper:        #f6efe2;   /* parchment */
  --paper-soft:   #efe6d2;   /* card / quote */
  --rule:         #c9b993;   /* hairline */
  --ink:          #1f1a14;   /* primary text */
  --ink-soft:     #4a4135;   /* secondary text */
  --accent:       #8a4a26;   /* sienna */
  --accent-soft:  #b9743f;   /* highlight */
  --gold:         #a07d2c;   /* metric chips */
  --shadow:       0 1px 0 rgba(31,26,20,0.08), 0 14px 32px -22px rgba(31,26,20,0.35);

  --serif-display: "Cormorant Garamond", "EB Garamond", Garamond, "Apple Garamond", "Times New Roman", serif;
  --serif-body:    "EB Garamond", Garamond, "Iowan Old Style", "Apple Garamond", Georgia, "Times New Roman", serif;
  --mono:          "JetBrains Mono", "IBM Plex Mono", "Source Code Pro", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --maxw: 70rem;
  --measure: 38rem;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif-body);
  font-size: 19px;
  line-height: 1.62;
  font-feature-settings: "kern", "liga", "onum";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--accent-soft); color: var(--paper); }

/* ---------- layout ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 1.75rem; }

main section { padding: 4.25rem 0; border-top: 1px solid var(--rule); }
main section:first-of-type { border-top: 0; }

/* ---------- masthead ---------- */
.masthead {
  padding: 3rem 0 2.25rem;
  border-bottom: 3px double var(--rule);
}
.masthead .meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.masthead .meta span + span { text-align: right; }
.masthead h1 {
  font-family: var(--serif-display);
  font-weight: 500;
  font-size: clamp(2.6rem, 5.6vw, 4.4rem);
  line-height: 1.04;
  margin: 1.5rem 0 0.6rem;
  letter-spacing: -0.005em;
}
.masthead .deck {
  font-family: var(--serif-display);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(1.15rem, 1.8vw, 1.45rem);
  color: var(--ink-soft);
  max-width: 52rem;
  margin: 0 0 1.6rem;
}
.masthead .byline {
  font-size: 0.95rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--rule);
  padding-top: 1rem;
}
.masthead .byline a { color: var(--accent); }

/* ---------- type ---------- */
h2 {
  font-family: var(--serif-display);
  font-weight: 500;
  font-size: clamp(1.7rem, 2.6vw, 2.25rem);
  letter-spacing: -0.005em;
  margin: 0 0 0.4rem;
}
h2 .num {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--accent);
  display: block;
  margin-bottom: 0.4rem;
}
h3 {
  font-family: var(--serif-display);
  font-weight: 500;
  font-size: 1.3rem;
  margin: 2rem 0 0.5rem;
}
.lede {
  font-family: var(--serif-display);
  font-style: italic;
  font-size: 1.25rem;
  color: var(--ink-soft);
  max-width: var(--measure);
  margin: 0 0 2rem;
}
p { max-width: var(--measure); margin: 0 0 1rem; }
a { color: var(--accent); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent-soft); }

ul, ol { max-width: var(--measure); padding-left: 1.2rem; }
li { margin-bottom: 0.35rem; }

code, kbd, samp { font-family: var(--mono); font-size: 0.88em; background: var(--paper-soft); padding: 0.06em 0.3em; border-radius: 2px; }
pre {
  font-family: var(--mono);
  font-size: 0.86rem;
  line-height: 1.55;
  background: var(--paper-soft);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  padding: 1rem 1.1rem;
  overflow-x: auto;
  border-radius: 3px;
}
pre code { background: transparent; padding: 0; }

blockquote {
  font-family: var(--serif-display);
  font-style: italic;
  font-size: 1.18rem;
  color: var(--ink-soft);
  border-left: 3px solid var(--accent);
  margin: 1.4rem 0;
  padding: 0.2rem 0 0.2rem 1.2rem;
  max-width: var(--measure);
}

/* ---------- key result ---------- */
.lockup {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  margin: 1.5rem 0 0;
}
.lockup .cell {
  background: var(--paper);
  padding: 1.4rem 1.3rem;
}
.lockup .label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 0.5rem;
}
.lockup .value {
  font-family: var(--serif-display);
  font-size: 2.1rem;
  line-height: 1.05;
  font-feature-settings: "tnum", "lnum";
  color: var(--ink);
}
.lockup .value .unit {
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin-left: 0.25rem;
  font-style: italic;
}
.lockup .note {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-top: 0.5rem;
}

@media (max-width: 720px) {
  .lockup { grid-template-columns: 1fr; }
}

/* ---------- tables ---------- */
.tbl-wrap { overflow-x: auto; }
table {
  width: 100%;
  border-collapse: collapse;
  font-feature-settings: "tnum", "lnum";
  margin: 1.25rem 0 0.5rem;
  font-size: 0.96rem;
}
caption {
  caption-side: top;
  text-align: left;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  padding-bottom: 0.4rem;
}
thead th {
  text-align: left;
  font-family: var(--serif-display);
  font-weight: 500;
  font-size: 0.95rem;
  border-top: 2px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  padding: 0.55rem 0.7rem;
}
tbody td {
  padding: 0.55rem 0.7rem;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}
tbody tr:last-child td { border-bottom: 1px solid var(--ink); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
.diff-up   { color: var(--accent); }
.diff-flat { color: var(--ink-soft); }

/* ---------- figure ---------- */
figure {
  margin: 2rem 0 1.25rem;
  border-top: 1px solid var(--rule);
  padding-top: 1.25rem;
}
figure img {
  width: 100%;
  height: auto;
  display: block;
  background: var(--paper-soft);
  border: 1px solid var(--rule);
  border-radius: 2px;
}
figcaption {
  font-size: 0.92rem;
  color: var(--ink-soft);
  margin-top: 0.6rem;
  font-style: italic;
}
figcaption .num {
  font-family: var(--mono);
  font-style: normal;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-right: 0.5rem;
}

.fig-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}
.fig-grid figure { border-top: 1px solid var(--rule); }
@media (max-width: 760px) { .fig-grid { grid-template-columns: 1fr; } }

/* ---------- contents ---------- */
.contents {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  margin: 2rem 0 0;
}
.contents a {
  display: block;
  padding: 0.95rem 0.2rem;
  border-right: 1px solid var(--rule);
  color: var(--ink);
  text-decoration: none;
  font-family: var(--serif-display);
  font-size: 1.05rem;
}
.contents a:last-child { border-right: 0; }
.contents a .num {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--accent);
  display: block;
  margin-bottom: 0.2rem;
}
.contents a:hover { background: var(--paper-soft); }
@media (max-width: 720px) {
  .contents { grid-template-columns: 1fr; }
  .contents a { border-right: 0; border-bottom: 1px solid var(--rule); }
}

/* ---------- equations ---------- */
.eq {
  font-family: var(--serif-display);
  font-style: italic;
  font-size: 1.15rem;
  text-align: center;
  padding: 0.9rem 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  margin: 1rem 0;
  font-feature-settings: "tnum", "lnum";
}
.eq .lbl {
  float: right;
  font-family: var(--mono);
  font-style: normal;
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--accent);
  padding-top: 0.3rem;
}

/* ---------- callout ---------- */
.callout {
  background: var(--paper-soft);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  padding: 1.1rem 1.2rem;
  margin: 1.5rem 0;
  border-radius: 2px;
}
.callout .label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 0.45rem;
}
.callout p { margin: 0; max-width: none; }

/* ---------- sidenote / two column ---------- */
.cols-2 {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2.5rem;
  align-items: start;
}
@media (max-width: 820px) { .cols-2 { grid-template-columns: 1fr; } }
.aside-card {
  background: var(--paper-soft);
  border: 1px solid var(--rule);
  padding: 1.2rem 1.3rem;
  border-radius: 2px;
  font-size: 0.94rem;
}
.aside-card h4 {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.7rem;
}
.aside-card dl { margin: 0; }
.aside-card dt { font-family: var(--serif-display); font-size: 1rem; margin-top: 0.6rem; color: var(--ink); }
.aside-card dt:first-child { margin-top: 0; }
.aside-card dd { margin: 0.05rem 0 0; color: var(--ink-soft); font-size: 0.92rem; }

/* ---------- colophon ---------- */
.colophon {
  border-top: 3px double var(--rule);
  padding: 2.5rem 0 3rem;
  font-size: 0.9rem;
  color: var(--ink-soft);
}
.colophon .row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
}
.colophon h5 {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink);
  margin: 0 0 0.6rem;
}
.colophon ul { list-style: none; padding: 0; margin: 0; }
.colophon li { margin-bottom: 0.25rem; }
@media (max-width: 720px) { .colophon .row { grid-template-columns: 1fr; } }

/* ---------- ornament ---------- */
.ornament {
  text-align: center;
  font-family: var(--serif-display);
  font-size: 1.4rem;
  letter-spacing: 0.6em;
  color: var(--rule);
  margin: 2.5rem 0 0;
}