/* ═══════════════════════════════════════════════════════════
   CLAUDE SKILLS LAB — S11
   The Skills Surge — six months after Anthropic's Oct 16, 2025
   announcement. Four hand-coded SVG charts plus an editorial
   wrapper.
   ═══════════════════════════════════════════════════════════ */

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

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

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

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

.cs-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);
}

/* ── Headline panel ───────────────────────────────────────── */
.cs-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;
}
.cs-headline-cell .num {
  font-family: 'Newsreader', serif;
  font-style: italic;
  font-size: clamp(36px, 4.4vw, 52px);
  font-weight: 300;
  color: var(--accent);
  line-height: 1;
  display: block;
}
.cs-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) {
  .cs-headline { grid-template-columns: repeat(2, 1fr); }
}

/* ── Receipts box ─────────────────────────────────────────── */
.cs-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;
}
.cs-receipts-head {
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.cs-receipts dl {
  margin: 0;
  display: grid;
  grid-template-columns: minmax(220px, 280px) 1fr;
  gap: 6px 24px;
}
.cs-receipts dt { color: var(--ink-dim); }
.cs-receipts dd { margin: 0; color: var(--ink); }
@media (max-width: 720px) {
  .cs-receipts dl { grid-template-columns: 1fr; gap: 2px; }
  .cs-receipts dd { margin-bottom: 8px; }
}

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

/* ═══════════════════════════════════════════════════════════
   CHART FRAMES (each chart in its own panel)
   ═══════════════════════════════════════════════════════════ */
.cs-chart-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%);
}
.cs-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;
}
.cs-chart-title {
  font-family: 'Newsreader', serif;
  font-size: 22px;
  margin-bottom: 6px;
  font-weight: 400;
}
.cs-chart-sub {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 11px;
  color: var(--ink-soft);
  margin-bottom: 24px;
  letter-spacing: 0.04em;
}
.cs-chart-svg { display: block; width: 100%; height: auto; user-select: none; }
.cs-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);
}
.cs-chart-legend .swatch {
  display: inline-block;
  width: 14px;
  height: 14px;
  vertical-align: middle;
  margin-right: 8px;
}

/* ── Chart 1: Power-law bar chart ─────────────────────────── */
.cs-chart-svg .axis-line { stroke: var(--ink); stroke-width: 1; }
.cs-chart-svg .gridline { stroke: var(--ink-dim); stroke-width: 0.5; opacity: 0.35; }
.cs-chart-svg .axis-label {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 9.5px;
  fill: var(--ink-dim);
  letter-spacing: 0.04em;
}
.cs-chart-svg .repo-label {
  font-family: 'Newsreader', serif;
  font-size: 12px;
  fill: var(--ink);
  cursor: default;
}
.cs-chart-svg .repo-stars {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 10px;
  fill: var(--ink);
  font-variant-numeric: tabular-nums;
}
.cs-chart-svg .bar-anthropic { fill: var(--accent); }
.cs-chart-svg .bar-vendor    { fill: color-mix(in oklab, var(--accent) 40%, var(--ink) 60%); }
.cs-chart-svg .bar-community { fill: var(--ink); opacity: 0.7; }
.cs-chart-svg .bar-aggregator { fill: var(--ink-dim); opacity: 0.85; }
.cs-chart-svg [data-row]:hover .bar { filter: brightness(1.1); }
.cs-chart-svg [data-row]:hover .repo-label { fill: var(--accent); }

.cs-legend-anthropic    { background: var(--accent); }
.cs-legend-vendor       { background: color-mix(in oklab, var(--accent) 40%, var(--ink) 60%); }
.cs-legend-community    { background: var(--ink); opacity: 0.7; }
.cs-legend-aggregator   { background: var(--ink-dim); opacity: 0.85; }

/* Tooltip overlay */
.cs-tooltip {
  position: absolute;
  pointer-events: none;
  z-index: 50;
  padding: 10px 14px;
  background: var(--ink);
  color: var(--paper);
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: 0.04em;
  border: 1px solid var(--accent);
  max-width: 280px;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 160ms ease, transform 160ms ease;
}
.cs-tooltip.is-visible { opacity: 1; transform: translateY(0); }
.cs-tooltip strong { color: var(--accent); font-weight: 500; }
.cs-tooltip-host { position: relative; }

/* ── Chart 2: Surge timeline (stacked area) ──────────────── */
.cs-chart-svg .timeline-baseline { stroke: var(--ink); stroke-width: 1; }
.cs-chart-svg .area-anthropic { fill: var(--accent); fill-opacity: 0.85; }
.cs-chart-svg .area-vendor    { fill: color-mix(in oklab, var(--accent) 40%, var(--ink) 60%); fill-opacity: 0.75; }
.cs-chart-svg .area-community { fill: var(--ink); fill-opacity: 0.55; }
.cs-chart-svg .event-line { stroke: var(--accent); stroke-dasharray: 3 3; stroke-width: 1; opacity: 0.7; }
.cs-chart-svg .event-label {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 9px;
  letter-spacing: 0.1em;
  fill: var(--accent);
  text-transform: uppercase;
}
.cs-chart-svg .month-label {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 9px;
  fill: var(--ink-dim);
}

/* ── Chart 3: 2x2 quadrant scatter ───────────────────────── */
.cs-chart-svg .quad-axis { stroke: var(--ink); stroke-width: 1; }
.cs-chart-svg .quad-mid { stroke: var(--ink-dim); stroke-width: 0.5; stroke-dasharray: 2 4; }
.cs-chart-svg .quad-label {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  fill: var(--ink-dim);
}
.cs-chart-svg .quad-quadrant-label {
  font-family: 'Newsreader', serif;
  font-style: italic;
  font-size: 12px;
  fill: var(--ink-dim);
  opacity: 0.55;
}
.cs-chart-svg .bubble {
  cursor: pointer;
  transition: r 180ms ease, fill-opacity 180ms ease;
}
.cs-chart-svg .bubble-anthropic    { fill: var(--accent); fill-opacity: 0.8; }
.cs-chart-svg .bubble-vendor       { fill: color-mix(in oklab, var(--accent) 40%, var(--ink) 60%); fill-opacity: 0.7; }
.cs-chart-svg .bubble-community    { fill: var(--ink); fill-opacity: 0.55; }
.cs-chart-svg .bubble-aggregator   { fill: var(--ink-dim); fill-opacity: 0.65; }
.cs-chart-svg .bubble:hover { fill-opacity: 1; stroke: var(--accent); stroke-width: 1.5; }

/* ── Chart 4: Verb frequency bars ────────────────────────── */
.cs-chart-svg .verb-bar { fill: var(--ink); transition: fill 160ms ease; }
.cs-chart-svg .verb-bar.is-style { fill: var(--accent); }
.cs-chart-svg [data-verb]:hover .verb-bar { fill: var(--accent); }
.cs-chart-svg .verb-label {
  font-family: 'Newsreader', serif;
  font-style: italic;
  font-size: 14px;
  fill: var(--ink);
}
.cs-chart-svg .verb-count {
  font-family: 'DM Mono', ui-monospace, monospace;
  font-size: 10px;
  fill: var(--ink);
  font-variant-numeric: tabular-nums;
}

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