/* ═══════════════════════════════════════════════════════════
   ATTENTION LAB — TEST. 07
   "Attention Is All You Need" (Vaswani et al., 2017),
   anatomized. Mirrors the deepseek-v4 / subquadratic stylesheet
   with two added interactives: a hover-able attention heatmap
   and a complexity slider with reactive bars.
   ═══════════════════════════════════════════════════════════ */

.att-main {
  background: var(--paper);
  color: var(--ink);
}

/* ── Attribution banner (sticky) ────────────────────────────── */
.att-attr-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 48px;
  background: var(--ink);
  color: var(--paper);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  position: sticky;
  top: 0;
  z-index: 40;
}
.att-attr-banner strong { color: var(--accent); font-weight: 500; }
.att-attr-tag {
  display: inline-block;
  padding: 3px 8px;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 9px;
  letter-spacing: 0.16em;
  flex-shrink: 0;
}
.att-attr-right { opacity: 0.7; flex-shrink: 0; }
@media (max-width: 720px) {
  .att-attr-banner { flex-wrap: wrap; padding: 10px 20px; gap: 6px; }
  .att-attr-right { width: 100%; opacity: 0.5; }
}

/* ── Hero ───────────────────────────────────────────────────── */
.att-hero {
  padding: 120px 56px 60px 88px;
  max-width: 1280px;
  margin: 0 auto;
}
.att-title { margin-top: 22px; }
.att-kicker {
  margin-top: 24px;
  max-width: 720px;
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink-soft);
}
.att-dateline {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  max-width: 900px;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.att-dateline .label { color: var(--ink-dim); }
.att-dateline .value {
  color: var(--ink);
  margin-top: 4px;
  text-transform: none;
  letter-spacing: 0.04em;
  font-size: 12px;
}
.att-inline-nav {
  margin-top: 28px;
  font-family: "DM Mono", ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
.att-inline-nav a {
  color: var(--ink);
  border-bottom: 1px solid var(--ink-dim);
  margin: 0 6px;
  transition: color 200ms ease, border-color 200ms ease;
}
.att-inline-nav a:hover { color: var(--accent); border-color: var(--accent); }

/* ── Section frame ──────────────────────────────────────────── */
.att-section {
  padding: 80px 56px 80px 88px;
  max-width: 1280px;
  margin: 0 auto;
}
.att-section-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  max-width: 900px;
  margin-bottom: 36px;
}
.att-section-head h2 {
  font-family: 'Newsreader', serif;
  font-weight: 300;
  font-size: clamp(36px, 4.6vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.015em;
  margin: 0;
  text-wrap: balance;
}
.att-section-head .att-section-italic {
  font-style: italic;
  color: var(--accent);
}
.att-section-prose {
  max-width: 720px;
  font-family: 'Newsreader', serif;
  font-weight: 300;
  font-size: 18px;
  line-height: 1.6;
  color: var(--ink);
}
.att-section-prose p { margin: 0 0 18px; }
.att-section-prose p:last-child { margin-bottom: 0; }
.att-section-prose strong { font-weight: 500; }
.att-section-prose em { font-style: italic; color: var(--ink-soft); }
.att-section-prose code {
  font-family: 'DM Mono', ui-monospace, monospace;
  background: color-mix(in oklab, var(--ink) 8%, transparent);
  padding: 1px 5px;
  font-size: 14px;
}

/* Drop cap on the first paragraph of each section's prose */
.att-lede::first-letter {
  font-family: 'Newsreader', Georgia, serif;
  font-weight: 500;
  font-style: normal;
  float: left;
  font-size: 4em;
  line-height: 0.85;
  padding: 0.05em 0.08em 0 0;
  margin: 0.05em 0.06em 0 0;
  color: var(--ink);
}

/* ── Equation panel ─────────────────────────────────────────── */
.att-eq {
  margin: 32px 0;
  padding: 28px 32px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  background: color-mix(in oklab, var(--paper) 88%, var(--ink) 6%);
  text-align: center;
  font-family: 'Newsreader', serif;
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.4;
}
.att-eq em { font-style: italic; color: var(--accent); }
.att-eq .att-eq-caption {
  display: block;
  margin-top: 12px;
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

/* ── Paired diagram grid ────────────────────────────────────── */
.att-paired {
  margin: 48px 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: stretch;
}
.att-paired > figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  border: 1px solid color-mix(in oklab, var(--ink) 20%, transparent);
  background: color-mix(in oklab, var(--paper) 92%, var(--ink) 4%);
  padding: 24px;
}
.att-paired figcaption {
  margin-top: 16px;
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
.att-paired figcaption strong {
  color: var(--accent);
  font-weight: 500;
  display: block;
  margin-bottom: 4px;
  font-size: 10px;
  letter-spacing: 0.18em;
}
.att-svg-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 280px;
}
.att-svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  color: var(--ink);
}
.att-svg .stroke { stroke: currentColor; fill: none; }
.att-svg .fill { fill: currentColor; }
.att-svg .accent-fill { fill: var(--accent); }
.att-svg .accent-stroke { stroke: var(--accent); fill: none; }
.att-svg .dim { opacity: 0.35; }
.att-svg .label-mono {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  fill: var(--ink-dim);
}
.att-svg .label-fig {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 8.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  fill: var(--ink);
}

@media (max-width: 900px) {
  .att-paired { grid-template-columns: 1fr; gap: 18px; }
}

/* ── Receipts box ───────────────────────────────────────────── */
.att-receipts {
  margin-top: 36px;
  padding: 20px 24px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  background: color-mix(in oklab, var(--paper) 88%, var(--ink) 6%);
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 12px;
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}
.att-receipts-head {
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.att-receipts dl {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(220px, 280px) 1fr;
  gap: 6px 24px;
}
.att-receipts dt { color: var(--ink-dim); }
.att-receipts dd { margin: 0; color: var(--ink); }
@media (max-width: 720px) {
  .att-receipts dl { grid-template-columns: 1fr; gap: 2px; }
  .att-receipts dd { margin-bottom: 8px; }
}

/* ── For-the-curious math expander ─────────────────────────── */
.att-curious {
  margin-top: 28px;
  padding: 16px 20px;
  border-left: 2px solid var(--ink-dim);
  background: transparent;
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 12px;
  line-height: 1.6;
  color: var(--ink-soft);
}
.att-curious summary {
  cursor: pointer;
  color: var(--ink);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  list-style: none;
  outline: none;
}
.att-curious summary::-webkit-details-marker { display: none; }
.att-curious summary::before {
  content: '▸ ';
  display: inline-block;
  margin-right: 6px;
  transition: transform 200ms ease;
}
.att-curious[open] summary::before {
  transform: rotate(90deg);
}
.att-curious p { margin: 14px 0 0; }
.att-curious code {
  font-family: 'DM Mono', ui-monospace, monospace;
  background: color-mix(in oklab, var(--ink) 10%, transparent);
  padding: 1px 5px;
  font-size: 11px;
}

/* ── INTERACTIVE: Attention heatmap (§ II) ────────────────── */
.att-heatmap-wrap {
  margin: 36px 0 12px;
  padding: 28px 32px;
  border: 1px solid color-mix(in oklab, var(--ink) 20%, transparent);
  background: color-mix(in oklab, var(--paper) 92%, var(--ink) 4%);
}
.att-heatmap-head {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 8px;
}
.att-heatmap-title {
  font-family: 'Newsreader', serif;
  font-size: 22px;
  margin-bottom: 6px;
  font-weight: 400;
}
.att-heatmap-sub {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 11px;
  color: var(--ink-soft);
  margin-bottom: 24px;
  letter-spacing: 0.04em;
}
.att-heatmap-grid {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 0;
  font-family: 'DM Mono', ui-monospace, monospace;
  font-variant-numeric: tabular-nums;
  user-select: none;
}
.att-hm-corner { /* spacer in top-left */
  border-bottom: 1px solid color-mix(in oklab, var(--ink) 22%, transparent);
}
.att-hm-cols {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0;
  border-bottom: 1px solid color-mix(in oklab, var(--ink) 22%, transparent);
  padding-bottom: 8px;
}
.att-hm-col-label {
  text-align: center;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  text-transform: lowercase;
  padding: 4px 0;
}
.att-hm-col-label .att-hm-col-idx {
  display: block;
  font-size: 9px;
  color: var(--ink-dim);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin-bottom: 2px;
}
.att-hm-row {
  display: contents;
  cursor: pointer;
}
.att-hm-row-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
  text-transform: lowercase;
  padding: 0 12px 0 0;
  border-right: 1px solid color-mix(in oklab, var(--ink) 22%, transparent);
  transition: color 180ms ease;
}
.att-hm-row-label .att-hm-row-idx {
  font-size: 9px;
  color: var(--ink-dim);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  flex-shrink: 0;
}
.att-hm-cells {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1px;
  background: color-mix(in oklab, var(--ink) 18%, transparent);
  padding: 1px;
}
.att-hm-cell {
  position: relative;
  aspect-ratio: 1.25;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  background: var(--paper);
  color: var(--ink);
  transition: filter 180ms ease, transform 180ms ease;
}
.att-hm-cell .att-hm-fill {
  position: absolute;
  inset: 0;
  background: var(--accent);
  opacity: 0;
  transition: opacity 220ms ease;
  pointer-events: none;
}
.att-hm-cell .att-hm-num {
  position: relative;
  z-index: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  color: color-mix(in oklab, var(--ink) 70%, transparent);
}
.att-hm-cell.att-hm-strong .att-hm-num {
  color: var(--paper);
}
.att-hm-row.is-active .att-hm-row-label {
  color: var(--accent);
}
.att-hm-row.is-active .att-hm-cell {
  filter: saturate(1.15);
}
.att-hm-row.is-active .att-hm-cell .att-hm-fill {
  outline: 1px solid var(--ink);
  outline-offset: -1px;
}
.att-hm-row.is-dim .att-hm-cell .att-hm-fill {
  opacity: calc(var(--w, 0) * 0.25) !important;
}
.att-hm-readout {
  margin-top: 20px;
  padding: 14px 18px;
  border: 1px solid color-mix(in oklab, var(--ink) 20%, transparent);
  background: var(--paper);
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 12px;
  line-height: 1.55;
  color: var(--ink-soft);
  min-height: 64px;
}
.att-hm-readout strong { color: var(--ink); font-weight: 500; }
.att-hm-readout .att-hm-readout-accent { color: var(--accent); }
@media (max-width: 720px) {
  .att-heatmap-grid { grid-template-columns: 80px 1fr; }
  .att-hm-cell .att-hm-num { font-size: 9px; }
}

/* ── Multi-head strip (§ III) ─────────────────────────────── */
.att-heads {
  margin: 36px 0;
  padding: 28px 32px;
  border: 1px solid color-mix(in oklab, var(--ink) 20%, transparent);
  background: color-mix(in oklab, var(--paper) 92%, var(--ink) 4%);
}
.att-heads-head {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 8px;
}
.att-heads-title {
  font-family: 'Newsreader', serif;
  font-size: 22px;
  margin-bottom: 24px;
  font-weight: 400;
}
.att-heads-strip {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 14px;
}
.att-head {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.att-head-label {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
  text-align: center;
}
.att-head-label .att-head-name {
  display: block;
  margin-top: 2px;
  color: var(--ink-soft);
  font-size: 8.5px;
  letter-spacing: 0.08em;
  text-transform: none;
}
.att-head-mini {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1px;
  background: color-mix(in oklab, var(--ink) 18%, transparent);
  padding: 1px;
}
.att-head-cell {
  aspect-ratio: 1;
  background: var(--paper);
  position: relative;
}
.att-head-cell .fill {
  position: absolute;
  inset: 0;
  background: var(--accent);
}
@media (max-width: 1100px) {
  .att-heads-strip { grid-template-columns: repeat(4, 1fr); gap: 12px; }
}
@media (max-width: 600px) {
  .att-heads-strip { grid-template-columns: repeat(2, 1fr); gap: 10px; }
}

/* ── INTERACTIVE: Complexity slider (§ V) ─────────────────── */
.att-slider-wrap {
  margin: 36px 0 12px;
  padding: 28px 32px;
  border: 1px solid color-mix(in oklab, var(--ink) 20%, transparent);
  background: color-mix(in oklab, var(--paper) 92%, var(--ink) 4%);
}
.att-slider-head {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 8px;
}
.att-slider-title {
  font-family: 'Newsreader', serif;
  font-size: 22px;
  margin-bottom: 6px;
  font-weight: 400;
}
.att-slider-sub {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 11px;
  color: var(--ink-soft);
  margin-bottom: 24px;
  letter-spacing: 0.04em;
}
.att-slider-control {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: center;
  margin-bottom: 24px;
}
.att-slider-control input[type="range"] {
  width: 100%;
  height: 6px;
  appearance: none;
  background: color-mix(in oklab, var(--ink) 14%, transparent);
  border-radius: 3px;
  cursor: pointer;
  outline: none;
}
.att-slider-control input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  width: 18px;
  height: 18px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid var(--paper);
  box-shadow: 0 0 0 1px var(--accent);
}
.att-slider-control input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid var(--paper);
}
.att-slider-readout {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  min-width: 220px;
  text-align: right;
}
.att-slider-readout .att-slider-n {
  font-family: 'Newsreader', serif;
  font-style: italic;
  font-size: 26px;
  color: var(--accent);
  margin-right: 6px;
}
.att-slider-readout .att-slider-tag {
  display: inline-block;
  margin-left: 10px;
  padding: 2px 8px;
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  border: 1px solid color-mix(in oklab, var(--ink) 25%, transparent);
  color: var(--ink-soft);
}
.att-bars {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  font-family: 'DM Mono', ui-monospace, monospace;
}
.att-bar-row {
  display: grid;
  grid-template-columns: 200px 1fr 140px;
  gap: 14px;
  align-items: center;
  font-size: 11px;
  letter-spacing: 0.04em;
}
.att-bar-label {
  color: var(--ink);
}
.att-bar-label .att-bar-formula {
  display: block;
  margin-top: 2px;
  font-size: 10px;
  color: var(--ink-dim);
  letter-spacing: 0.06em;
}
.att-bar-track {
  height: 22px;
  background: color-mix(in oklab, var(--ink) 6%, transparent);
  position: relative;
  overflow: hidden;
}
.att-bar-fill {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  background: var(--ink);
  width: 0%;
  transition: width 240ms cubic-bezier(0.22, 0.61, 0.36, 1);
}
.att-bar-row.is-self .att-bar-fill { background: var(--accent); }
.att-bar-row.is-recurrent .att-bar-fill { background: var(--ink); opacity: 0.85; }
.att-bar-row.is-conv .att-bar-fill { background: var(--ink-soft); }
.att-bar-row.is-restricted .att-bar-fill { background: color-mix(in oklab, var(--accent) 60%, var(--ink) 30%); }
.att-bar-value {
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  font-size: 12px;
}
.att-bar-value .att-bar-unit {
  font-size: 9px;
  color: var(--ink-dim);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-left: 4px;
}
.att-slider-note {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid color-mix(in oklab, var(--ink) 20%, transparent);
  font-family: 'Newsreader', serif;
  font-style: italic;
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink-soft);
}
.att-slider-note span { color: var(--accent); font-style: italic; }
@media (max-width: 720px) {
  .att-slider-control { grid-template-columns: 1fr; }
  .att-slider-readout { text-align: left; }
  .att-bar-row { grid-template-columns: 1fr; gap: 4px; }
  .att-bar-value { text-align: left; }
}

/* ── Architecture stack diagram (§ IV) ────────────────────── */
.att-arch {
  margin: 36px 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.att-arch-side {
  border: 1px solid color-mix(in oklab, var(--ink) 20%, transparent);
  background: color-mix(in oklab, var(--paper) 92%, var(--ink) 4%);
  padding: 24px 28px;
}
.att-arch-side header {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid color-mix(in oklab, var(--ink) 20%, transparent);
}
.att-arch-side header .sub {
  display: block;
  margin-top: 2px;
  color: var(--ink-dim);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.att-arch-stack {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.att-arch-block {
  border: 1px solid color-mix(in oklab, var(--ink) 30%, transparent);
  padding: 12px 16px;
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.06em;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--paper);
}
.att-arch-block.is-attn { border-color: var(--accent); color: var(--accent); }
.att-arch-block.is-norm { color: var(--ink-dim); font-size: 10px; padding: 6px 16px; border-style: dashed; }
.att-arch-block.is-mha { background: color-mix(in oklab, var(--accent) 12%, var(--paper)); }
.att-arch-block.is-ffn { background: color-mix(in oklab, var(--ink) 6%, var(--paper)); }
.att-arch-block .b-tag {
  font-size: 9px;
  letter-spacing: 0.14em;
  color: var(--ink-dim);
  text-transform: uppercase;
}
.att-arch-stack .att-arch-stack-meta {
  text-align: center;
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 9.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin: 6px 0;
}
@media (max-width: 720px) {
  .att-arch { grid-template-columns: 1fr; }
}

/* ── Methodology / closing ─────────────────────────────────── */
.att-method {
  padding: 80px 56px 80px 88px;
  max-width: 1080px;
  margin: 0 auto;
  border-top: 1px solid color-mix(in oklab, var(--ink) 22%, transparent);
}
.att-method-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px 48px;
}
.att-method-grid h3 {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 12px;
}
.att-method-grid p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--ink-soft);
}
.att-method-grid a {
  color: var(--ink);
  border-bottom: 1px solid var(--ink-dim);
}
.att-method-grid a:hover { color: var(--accent); border-color: var(--accent); }
.att-closing {
  margin-top: 56px;
  padding-top: 36px;
  border-top: 1px solid color-mix(in oklab, var(--ink) 22%, transparent);
  font-family: 'Newsreader', serif;
  font-style: italic;
  font-weight: 300;
  font-size: 19px;
  line-height: 1.55;
  color: var(--ink);
  max-width: 720px;
}
.att-closing p { margin: 0 0 16px; }

/* ── Lab nav ───────────────────────────────────────────────── */
.lab-nav {
  margin: 0 88px 80px;
  padding: 22px 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.lab-nav a { color: var(--ink); border-bottom: 1px solid transparent; transition: border-color 180ms ease; }
.lab-nav a:hover { border-bottom-color: var(--ink); }
.lab-nav-meta { color: var(--ink-dim); }

@media (max-width: 900px) {
  .att-hero { padding: 100px 24px 40px; }
  .att-section { padding: 60px 24px; }
  .att-method { padding: 60px 24px; }
  .att-method-grid { grid-template-columns: 1fr; gap: 28px; }
  .att-dateline { grid-template-columns: 1fr; gap: 14px; }
  .lab-nav { flex-direction: column; gap: 10px; align-items: flex-start; margin: 0 24px 60px; }
}