/* Tennessee Labs — tennesseelabs.com
   Paper: bone stock. Ink: graphite. Accents borrowed from the annotation
   legend, so no color appears on the page that does not mean something. */

:root {
  --paper:      #f1f1ec;
  --card:       #fbfbf8;
  --ink:        #16181a;
  --ink-2:      #5c605e;
  --ink-3:      #8a8d88;
  --rule:       #d3d4cc;
  --rule-soft:  #e2e2db;

  --device:     #2f6b4f;
  --drug:       #1d5c7f;
  --finding:    #7a3e6c;
  --negated:    #86897f;

  --accent:     var(--drug);

  --serif: "Newsreader", "Iowan Old Style", Georgia, serif;
  --sans:  "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono:  "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --gutter: clamp(1.25rem, 5vw, 3.5rem);
  --measure: 62ch;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}

p { margin: 0 0 1.1em; }
p:last-child { margin-bottom: 0; }

a { color: var(--accent); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* ---------- masthead ---------- */

.masthead {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2rem;
  align-items: baseline;
  justify-content: space-between;
  padding: 1rem var(--gutter);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 400;
  letter-spacing: 0.01em;
  color: var(--ink);
  text-decoration: none;
}

.mark {
  width: 1.15rem;
  height: 1.15rem;
  flex: none;
}

.mark-span { stroke: var(--accent); }

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.nav a {
  color: var(--ink-2);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}

.nav a:hover { color: var(--ink); border-bottom-color: var(--ink); }

/* ---------- report grid ---------- */

.band {
  display: grid;
  grid-template-columns: 12rem minmax(0, 1fr);
  gap: 0 3.5rem;
  max-width: 68rem;
  margin: 0 auto;
  padding: 3.75rem var(--gutter);
  border-bottom: 1px solid var(--rule-soft);
}

.band--hero { padding-top: 5.5rem; padding-bottom: 3rem; border-bottom: 0; }
.band--contact { border-bottom: 0; }

.col { max-width: var(--measure); }

.rail { padding-top: 0.35rem; }

.label {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 500;
  line-height: 1.55;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
}

.label--section { color: var(--ink); }
.label--section::before {
  content: "";
  display: block;
  width: 1.75rem;
  border-top: 2px solid var(--accent);
  margin-bottom: 0.7rem;
}

.rail-note {
  margin: 0.9rem 0 0;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--ink-3);
  max-width: 11rem;
}

/* ---------- hero ---------- */

.display {
  margin: 0 0 1.1rem;
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(2.75rem, 7vw, 4.75rem);
  line-height: 1.0;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

.deck {
  font-size: clamp(1.0625rem, 1.7vw, 1.25rem);
  line-height: 1.55;
  color: var(--ink);
}

.qualifier {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.0625rem;
  color: var(--ink-2);
}

/* ---------- Fig. 1 — the specimen ---------- */

.specimen {
  max-width: 68rem;
  margin: 0 auto 1rem;
  padding: 0 var(--gutter);
}

.specimen-head {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  padding-bottom: 0.6rem;
}

.specimen-title {
  font-size: 0.8125rem;
  color: var(--ink-2);
}

.signals {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.panel {
  background: var(--card);
  padding: 1.4rem 1.15rem 1.25rem;
}

.trace {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: 1.1rem;
}

.trace-line {
  fill: none;
  stroke: var(--ink);
  stroke-width: 1.1;
  stroke-linejoin: round;
  stroke-linecap: round;
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  animation: draw 1000ms ease-out forwards;
  animation-delay: calc(250ms + var(--i) * 200ms);
}

.trace-mark {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2.2;
  stroke-linecap: round;
  opacity: 0;
  animation: fade-in 400ms ease-out forwards;
  animation-delay: calc(950ms + var(--i) * 200ms);
}

.trace-mark--none {
  stroke: var(--negated);
  stroke-width: 1.3;
  stroke-linecap: butt;
  stroke-dasharray: 2 2;
}

.panel-body {
  opacity: 0;
  animation: fade-in 400ms ease-out forwards;
  animation-delay: calc(1050ms + var(--i) * 200ms);
}

.panel-read {
  margin: 0.45rem 0 0.9rem;
  font-family: var(--serif);
  font-size: 1.1875rem;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.panel-read--none { color: var(--ink-3); }

.conf {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.conf-num {
  font-family: var(--mono);
  font-size: 0.8125rem;
  color: var(--ink-2);
  min-width: 2.2rem;
}

.conf-bar {
  flex: 1;
  height: 2px;
  background: var(--rule-soft);
}

.conf-bar i {
  display: block;
  height: 2px;
  background: var(--accent);
}

.conf--none .conf-bar {
  height: 0;
  background: none;
  border-top: 1.5px dashed var(--negated);
}

@keyframes draw    { to { stroke-dashoffset: 0; } }
@keyframes fade-in { to { opacity: 1; } }

/* ---------- annotation (Fig. 2) ---------- */

.note {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.1875rem;
  line-height: 2.1;
  color: var(--ink);
}

.ann {
  text-decoration-line: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.28em;
  text-decoration-color: currentColor;
}

.tag {
  font-family: var(--mono);
  font-size: 0.5rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  vertical-align: 0.75em;
  margin-left: 0.3em;
  white-space: nowrap;
}

.ann--device  { color: var(--device);  }
.ann--drug    { color: var(--drug);    }
.ann--finding { color: var(--finding); }
.ann--negated { color: var(--negated); text-decoration-style: dashed; text-decoration-thickness: 1.5px; }

.inline-fig {
  margin: 1.6rem 0 0;
  padding: 1.35rem 0 0;
  border-top: 1px solid var(--rule-soft);
}

.inline-fig .caption { margin-top: 0.9rem; }
.inline-fig .label { display: inline; margin-right: 0.5rem; }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
  font-size: 0.75rem;
  color: var(--ink-2);
}

.legend-item { display: flex; align-items: center; gap: 0.5rem; }

.swatch { width: 1.1rem; height: 0; border-top: 2px solid; }
.swatch--signal { border-color: var(--ink); border-top-width: 1.5px; }
.swatch--pwave  { border-color: var(--accent); }
.swatch--none   { border-color: var(--negated); border-top-style: dashed; border-top-width: 1.5px; }

.caption {
  max-width: 46rem;
  margin-top: 1.1rem;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--ink-3);
}

/* ---------- entries ---------- */

.entry { margin-bottom: 2.25rem; }
.entry:last-child { margin-bottom: 0; }

.entry-title {
  margin: 0 0 0.4rem;
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.375rem;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.entry p, .step p { color: var(--ink-2); }

/* ---------- method ---------- */

.steps { margin: 0; padding: 0; list-style: none; }

.step {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 1rem;
  padding: 1.15rem 0;
  border-top: 1px solid var(--rule-soft);
}

.step:first-child { border-top: 0; padding-top: 0; }

.step-num {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  padding-top: 0.35rem;
}

/* ---------- fit ---------- */

.fit-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 2rem;
}

.list {
  margin: 0.9rem 0 0;
  padding: 0;
  list-style: none;
  font-size: 0.9375rem;
  color: var(--ink-2);
}

.list li {
  padding: 0.5rem 0 0.5rem 1rem;
  border-top: 1px solid var(--rule-soft);
  position: relative;
}

.list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.15rem;
  width: 5px;
  border-top: 1px solid var(--accent);
}

.list--muted li::before { border-color: var(--ink-3); border-top-style: dashed; }

/* ---------- contact ---------- */

.contact-lead {
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2.4vw, 1.625rem);
  line-height: 1.35;
  margin-bottom: 1.4rem;
}

.email {
  display: inline-block;
  font-family: var(--mono);
  font-size: clamp(1rem, 2.6vw, 1.5rem);
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.3em;
}

.email:hover { color: var(--accent); }

/* ---------- footer ---------- */

.footer {
  max-width: 68rem;
  margin: 0 auto;
  padding: 2.5rem var(--gutter) 3.5rem;
  border-top: 1px solid var(--rule);
  font-size: 0.8125rem;
  color: var(--ink-2);
}

.disclaimer { max-width: 46rem; color: var(--ink-3); }

/* ---------- narrow ---------- */

@media (max-width: 56rem) {
  .band {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding-top: 3rem;
    padding-bottom: 3rem;
  }
  .band--hero { padding-top: 3.5rem; }
  .rail { padding-top: 0; }
  .rail-note { max-width: var(--measure); }
  .note { line-height: 2.3; }
  .step { grid-template-columns: 2.25rem 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .trace-line { animation: none; stroke-dasharray: none; stroke-dashoffset: 0; }
  .trace-mark,
  .panel-body { animation: none; opacity: 1; }
}