/* ═══════════════════════════════════════════════════════════
   DEEPSEEK-V4 LAB — TEST. 05
   Authored by Claude Code · Subject: DeepSeek-V4 architecture
   ═══════════════════════════════════════════════════════════ */

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

/* ── Attribution banner (sticky) ────────────────────────────── */
.ds-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;
}
.ds-attr-banner strong { color: var(--accent); font-weight: 500; }
.ds-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;
}
.ds-attr-right { opacity: 0.7; flex-shrink: 0; }
@media (max-width: 720px) {
  .ds-attr-banner { flex-wrap: wrap; padding: 10px 20px; gap: 6px; }
  .ds-attr-right { width: 100%; opacity: 0.5; }
}

/* ── Hero ───────────────────────────────────────────────────── */
.ds-hero {
  padding: 120px 56px 60px 88px;
  max-width: 1280px;
  margin: 0 auto;
}
.ds-title { margin-top: 22px; }
.ds-kicker {
  margin-top: 24px;
  max-width: 720px;
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink-soft);
}
.ds-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;
}
.ds-dateline .label { color: var(--ink-dim); }
.ds-dateline .value {
  color: var(--ink);
  margin-top: 4px;
  text-transform: none;
  letter-spacing: 0.04em;
  font-size: 12px;
}
.ds-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);
}
.ds-inline-nav a {
  color: var(--ink);
  border-bottom: 1px solid var(--ink-dim);
  margin: 0 6px;
  transition: color 200ms ease, border-color 200ms ease;
}
.ds-inline-nav a:hover { color: var(--accent); border-color: var(--accent); }

/* ── Section frame ──────────────────────────────────────────── */
.ds-section {
  padding: 80px 56px 80px 88px;
  max-width: 1280px;
  margin: 0 auto;
}
.ds-section-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  max-width: 900px;
  margin-bottom: 36px;
}
.ds-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;
}
.ds-section-head .ds-section-italic {
  font-style: italic;
  color: var(--accent);
}
.ds-section-prose {
  max-width: 720px;
  font-family: 'Newsreader', serif;
  font-weight: 300;
  font-size: 18px;
  line-height: 1.6;
  color: var(--ink);
}
.ds-section-prose p { margin: 0 0 18px; }
.ds-section-prose p:last-child { margin-bottom: 0; }
.ds-section-prose strong { font-weight: 500; }
.ds-section-prose em { font-style: italic; color: var(--ink-soft); }

/* Drop cap on the first paragraph of each section's prose */
.ds-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);
}

/* ── Paired diagram grid ────────────────────────────────────── */
.ds-paired {
  margin: 48px 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: stretch;
}
.ds-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;
}
.ds-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);
}
.ds-paired figcaption strong {
  color: var(--accent);
  font-weight: 500;
  display: block;
  margin-bottom: 4px;
  font-size: 10px;
  letter-spacing: 0.18em;
}
.ds-svg-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 280px;
}
.ds-svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  color: var(--ink);
}
.ds-svg .stroke { stroke: currentColor; fill: none; }
.ds-svg .fill { fill: currentColor; }
.ds-svg .accent-fill { fill: var(--accent); }
.ds-svg .accent-stroke { stroke: var(--accent); fill: none; }
.ds-svg .dim { opacity: 0.35; }
.ds-svg .label-mono {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  fill: var(--ink-dim);
}
.ds-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) {
  .ds-paired { grid-template-columns: 1fr; gap: 18px; }
}

/* ── Receipts box ───────────────────────────────────────────── */
.ds-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;
}
.ds-receipts-head {
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.ds-receipts dl {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(180px, 220px) 1fr;
  gap: 6px 24px;
}
.ds-receipts dt { color: var(--ink-dim); }
.ds-receipts dd { margin: 0; color: var(--ink); }
@media (max-width: 720px) {
  .ds-receipts dl { grid-template-columns: 1fr; gap: 2px; }
  .ds-receipts dd { margin-bottom: 8px; }
}

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

/* ── Headline panel (used at top of § II) ──────────────────── */
.ds-headline {
  margin: 32px 0;
  padding: 28px 32px;
  background: var(--ink);
  color: var(--paper);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  font-family: 'DM Mono', ui-monospace, monospace;
  font-variant-numeric: tabular-nums;
}
.ds-headline-cell .num {
  font-family: 'Newsreader', serif;
  font-style: italic;
  font-size: clamp(40px, 4.6vw, 56px);
  font-weight: 300;
  color: var(--accent);
  line-height: 1;
  display: block;
}
.ds-headline-cell .label {
  display: block;
  margin-top: 10px;
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: color-mix(in oklab, var(--paper) 60%, transparent);
}
@media (max-width: 900px) {
  .ds-headline { grid-template-columns: repeat(2, 1fr); }
}

/* ── KV cache animated chart ───────────────────────────────── */
.ds-chart-wrap {
  margin: 36px 0 12px;
  padding: 24px;
  border: 1px solid color-mix(in oklab, var(--ink) 20%, transparent);
  background: color-mix(in oklab, var(--paper) 92%, var(--ink) 4%);
}
.ds-chart-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;
}
.ds-chart-title {
  font-family: 'Newsreader', serif;
  font-size: 22px;
  margin-bottom: 18px;
  font-weight: 400;
}
.ds-chart-svg { display: block; width: 100%; height: auto; }
.ds-chart-svg .axis-line { stroke: var(--ink); stroke-width: 1; }
.ds-chart-svg .gridline { stroke: var(--ink-dim); stroke-width: 0.5; opacity: 0.4; }
.ds-chart-svg .axis-label {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 10px;
  fill: var(--ink-dim);
  letter-spacing: 0.04em;
}
.ds-chart-svg .series-baseline { stroke: var(--ink); stroke-width: 1.5; fill: none; opacity: 0.55; }
.ds-chart-svg .series-v32 { stroke: var(--ink); stroke-width: 1.5; fill: none; stroke-dasharray: 4 3; }
.ds-chart-svg .series-v4pro { stroke: var(--accent); stroke-width: 2.4; fill: none; }
.ds-chart-svg .series-v4flash { stroke: var(--accent); stroke-width: 1.6; fill: none; stroke-dasharray: 6 3; }
.ds-chart-legend {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--ink);
}
.ds-chart-legend .swatch {
  display: inline-block;
  width: 20px;
  height: 2px;
  vertical-align: middle;
  margin-right: 8px;
}
.ds-chart-legend .swatch.s-baseline { background: var(--ink); opacity: 0.55; }
.ds-chart-legend .swatch.s-v32 { background:
  repeating-linear-gradient(90deg, var(--ink) 0 4px, transparent 4px 7px); }
.ds-chart-legend .swatch.s-v4pro { background: var(--accent); height: 3px; }
.ds-chart-legend .swatch.s-v4flash { background:
  repeating-linear-gradient(90deg, var(--accent) 0 6px, transparent 6px 9px); }

/* ── Stacked bars (per-layer KV memory) ────────────────────── */
.ds-stacked {
  margin: 24px 0;
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 18px;
  align-items: center;
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}
.ds-stacked-row { display: contents; }
.ds-stacked-label { color: var(--ink-dim); text-transform: uppercase; letter-spacing: 0.16em; }
.ds-stacked-bar {
  height: 22px;
  display: flex;
  align-items: stretch;
  background: color-mix(in oklab, var(--ink) 6%, transparent);
}
.ds-stacked-bar > span {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: 0 8px;
  color: var(--paper);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
}
.ds-stacked-bar .seg-csa { background: var(--ink); }
.ds-stacked-bar .seg-hca { background: color-mix(in oklab, var(--ink) 60%, var(--paper)); color: var(--paper); }
.ds-stacked-bar .seg-swa { background: var(--accent); }
.ds-stacked-bar .seg-fp4 { background: color-mix(in oklab, var(--accent) 60%, var(--ink) 30%); }
.ds-stacked-bar .seg-empty { background: transparent; }

/* ── Methodology / closing ─────────────────────────────────── */
.ds-method {
  padding: 80px 56px 80px 88px;
  max-width: 1080px;
  margin: 0 auto;
  border-top: 1px solid color-mix(in oklab, var(--ink) 22%, transparent);
}
.ds-method-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px 48px;
}
.ds-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;
}
.ds-method-grid p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--ink-soft);
}
.ds-method-grid a {
  color: var(--ink);
  border-bottom: 1px solid var(--ink-dim);
}
.ds-method-grid a:hover { color: var(--accent); border-color: var(--accent); }
.ds-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;
}
.ds-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) {
  .ds-hero { padding: 100px 24px 40px; }
  .ds-section { padding: 60px 24px; }
  .ds-method { padding: 60px 24px; }
  .ds-method-grid { grid-template-columns: 1fr; gap: 28px; }
  .ds-dateline { grid-template-columns: 1fr; gap: 14px; }
  .lab-nav { flex-direction: column; gap: 10px; align-items: flex-start; margin: 0 24px 60px; }
}