.control-article { --chart-temperature: var(--accent); --chart-relay: var(--accent-2); }
.control-article::before, .control-article::after { display: none; }
.control-article a:focus-visible, .control-article button:focus-visible,
.control-article input:focus-visible, .control-article summary:focus-visible { outline: 3px solid var(--accent-2); outline-offset: 5px; }
.skip-link { position: fixed; top: -80px; left: 12px; z-index: 60; padding: 10px 16px; background: var(--card); }
.skip-link:focus { top: 10px; }
.control-header .nav-wrap { justify-content: space-between; flex-wrap: wrap; }
.control-header nav { display: flex; align-items: center; gap: 24px; font-size: .9rem; }
.language-switch { display: inline-flex; align-items: center; gap: 4px; border-left: 1px solid var(--stroke); padding-left: 16px; }
.language-switch a, .language-switch span { padding: 6px 9px; border-radius: 6px; }
.language-switch [aria-current] { color: var(--ink); background: var(--bg-alt); font-weight: 600; }
.article-intro { padding: clamp(42px, 7vw, 90px) 0 48px; border-bottom: 1px solid var(--stroke); }
.article-intro .eyebrow { display: block; margin-bottom: 24px; }
.article-intro h1 { max-width: 900px; font-size: clamp(2.5rem, 6.5vw, 5.25rem); letter-spacing: -.045em; line-height: 1.04; }
.article-intro h1 em { color: var(--accent); font-style: normal; }
.article-intro .lead { max-width: 750px; margin-top: 24px; font-size: clamp(1.05rem, 1.7vw, 1.25rem); }
.intro-links { display: flex; flex-wrap: wrap; gap: 12px 28px; margin-top: 28px; font-size: .9rem; }
.intro-links a { border-bottom: 1px solid var(--ink); padding: 6px 0; }
.reading-layout { display: grid; grid-template-columns: 185px minmax(0, 1fr); gap: 64px; align-items: start; }
.article-toc { position: sticky; top: 120px; padding-top: 52px; font-size: .88rem; }
.article-toc strong { display: block; margin-bottom: 18px; }
.article-toc nav { display: grid; gap: 14px; color: var(--muted); }
.article-body { min-width: 0; }
.article-body section { padding: 52px 0; border-bottom: 1px solid var(--stroke); scroll-margin-top: 110px; }
.article-body h2 { font-size: clamp(1.7rem, 3vw, 2.35rem); letter-spacing: -.025em; max-width: 730px; }
.section-number { display: block; margin-bottom: 12px; color: var(--muted); font-size: .8rem; letter-spacing: .08em; font-weight: 600; }
.article-body p, .article-body li { max-width: 740px; }
.article-body p { margin-top: 18px; }
.article-body a { text-decoration: underline; text-underline-offset: 4px; }
.takeaway { margin: 24px 0; padding: 10px 0 10px 22px; border-left: 3px solid var(--accent); }
.takeaway p { margin: 0; }
.pid-terms { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; margin: 28px 0; }
.pid-terms dt { color: var(--accent); font-size: 2rem; font-family: "Space Grotesk", sans-serif; }
.pid-terms dd { margin: 4px 0 0; font-size: .94rem; }
.chart-card { margin-top: 32px; padding: 24px; box-shadow: none; overflow: hidden; }
.chart-head { gap: 16px; align-items: flex-start; margin-bottom: 8px; }
.chart-head h3 { font-size: 1.1rem; margin: 0; }
.chart-head small { color: var(--muted); font-size: .8rem; white-space: nowrap; }
.chart-caption, .model-note { font-size: .85rem; color: var(--muted); }
.chart-caption { margin: 0 0 20px !important; }
.chart-controls { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin-bottom: 18px; }
.chart-controls label { display: grid; gap: 8px; font-size: .83rem; }
.chart-controls label span { min-height: 40px; }
.chart-controls output { font-weight: 600; font-variant-numeric: tabular-nums; }
.control-article input[type=range] { width: 100%; height: 24px; margin: 0; accent-color: var(--accent-2); cursor: pointer; }
.chart-legend { justify-content: flex-start; flex-wrap: wrap; gap: 10px 20px; color: var(--muted); }
.chart-legend span { display: inline-flex; align-items: center; gap: 7px; }
.chart-key { width: 20px; height: 0; border-top: 3px solid var(--chart-temperature); }
.chart-key.target { border-top: 2px dashed var(--ink); }
.chart-key.lead { border-top: 2px dashed var(--chart-relay); }
.chart-key.relay { border-top: 5px solid var(--chart-relay); }
.chart-plot { display: block; width: 100%; touch-action: pan-y; }
.chart-playback { display: flex; align-items: center; gap: 16px; margin-top: 12px; }
.chart-playback button { min-width: 112px; justify-content: center; flex-shrink: 0; }
.chart-time { display: flex; align-items: center; flex: 1; gap: 12px; min-width: 0; }
.chart-time output { width: 54px; text-align: right; flex-shrink: 0; font-size: .85rem; font-variant-numeric: tabular-nums; }
.chart-status { margin-top: 14px; font-size: .85rem; font-variant-numeric: tabular-nums; }
.chart-status span { display: inline-block; margin-right: 16px; }
.chart-metrics { margin-top: 8px; font-size: .8rem; color: var(--muted); }
.model-note { margin: 16px 0 0 !important; }
.chart-hover { position: absolute; z-index: 2; pointer-events: none; padding: 8px 12px; background: var(--ink); color: var(--card); border-radius: 8px; font-size: .78rem; white-space: pre-line; }
.chart-canvas { position: relative; }
.source-ref { display: inline-flex; vertical-align: middle; margin-left: 4px; }
.source-button { border: 0; border-bottom: 1px dotted var(--muted); background: transparent; color: var(--muted); padding: 4px 6px; cursor: help; font: inherit; font-size: .78rem; min-width: 26px; }
.source-tooltip { position: fixed; z-index: 50; width: min(360px, calc(100vw - 32px)); padding: 18px; background: var(--ink); color: var(--card); border-radius: 12px; box-shadow: var(--shadow); font-size: .85rem; line-height: 1.5; }
.source-tooltip strong { display: block; margin-bottom: 8px; }
.source-tooltip q { display: block; margin-bottom: 10px; }
.source-tooltip small { display: block; color: var(--accent-3); }
[hidden] { display: none !important; }
.comparison-wrap { overflow-x: auto; margin: 28px 0; }
.comparison-table { width: 100%; border-collapse: collapse; font-size: .93rem; }
.comparison-table th { text-align: left; color: var(--muted); font-weight: 500; }
.comparison-table td, .comparison-table th { padding: 16px 14px 16px 0; border-bottom: 1px solid var(--stroke); vertical-align: top; }
.comparison-table td:nth-child(2) { font-weight: 600; }
.article-body ol { padding-left: 24px; }
.article-body li { margin-bottom: 16px; padding-left: 6px; }
.article-cta { padding: 38px 0 62px; display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 22px; }
.article-cta p { max-width: 480px; margin: 0; }
.control-footer { padding: 28px 0; border-top: 1px solid var(--stroke); color: var(--muted); font-size: .85rem; }
.control-footer .container { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 18px; }
.control-footer nav { display: flex; gap: 20px; }
@media(max-width: 900px) {
  .reading-layout { grid-template-columns: 1fr; gap: 0; }
  .article-toc { position: static; padding-top: 28px; }
  .article-toc nav { display: flex; flex-wrap: wrap; gap: 12px 24px; }
  .article-toc strong { display: none; }
  .article-body section { padding: 38px 0; }
}
@media(max-width: 560px) {
  .control-header .nav-wrap { gap: 10px; padding: 12px 0; }
  .control-header nav { gap: 12px; font-size: .8rem; }
  .control-header .header-brand-title { font-size: 1rem; }
  .control-header .header-brand-tagline { font-size: .65rem; }
  .language-switch { padding-left: 8px; }
  .language-switch a, .language-switch span { padding: 5px; }
  .header-articles { display: none; }
  .chart-card { padding: 16px 12px; }
  .chart-head { flex-wrap: wrap; gap: 6px; }
  .chart-controls { grid-template-columns: 1fr; gap: 10px; }
  .chart-controls label { gap: 4px; }
  .chart-controls label span { min-height: 0; }
  .chart-playback { gap: 10px; }
  .chart-playback button { min-width: 90px; padding: 9px 12px; }
  .chart-time { gap: 6px; }
  .chart-time output { width: 38px; }
  .pid-terms { grid-template-columns: 1fr; gap: 12px; }
  .pid-terms div { display: grid; grid-template-columns: 40px 1fr; gap: 12px; }
  .comparison-table { font-size: .82rem; }
  .comparison-table td, .comparison-table th { padding-right: 8px; }
}
@media(prefers-reduced-motion: no-preference) {
  .article-intro h1 { animation: article-enter .5s var(--ease) both; }
  .article-intro .lead { animation: article-enter .5s .08s var(--ease) both; }
  .intro-links a { transition: color .18s; }
  @keyframes article-enter { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
}
@media print {
  .control-header, .article-toc, .chart-controls, .chart-playback, .source-ref, .article-cta, .skip-link { display: none; }
  .reading-layout { display: block; }
  .article-intro { padding: 20px 0; }
  .article-body section { break-inside: avoid; }
  .chart-card { break-inside: avoid; }
}