/* Social Kernel owns its diagrams; site.css owns the shared MAIOS language. */
body[data-surface="social-kernel"] { --sk-paper: #f8f7ea; }
body[data-surface="social-kernel"] [hidden] { display: none !important; }
.sk-hero { padding: clamp(2.5rem, 5vw, 4.5rem) 0 3.5rem; }
.sk-hero-layout { display: grid; grid-template-columns: 1.12fr 1fr; gap: clamp(2rem, 5vw, 5rem); align-items: center; }
.sk-hero .breadcrumb { margin-bottom: 2rem; }
.sk-hero h1 { font-size: var(--type-title-page); line-height: 1.05; letter-spacing: -.055em; margin: .6rem 0 1.3rem; }
.sk-lead { font-size: clamp(1.4rem, 2.1vw, 1.9rem); font-weight: 650; line-height: 1.3; max-width: 23ch; margin: 0 0 1.15rem; }
.sk-intro { max-width: 51ch; }
.sk-status { display: flex; align-items: center; gap: .5rem; margin-top: 1.6rem; font-size: .875rem; color: var(--ink-soft); }
.sk-status > span { width: .45rem; height: .45rem; border-radius: 50%; background: var(--green-dark); flex: 0 0 auto; }
.sk-thread { margin: 0; background: var(--sk-paper); border: 1px solid var(--line-strong); box-shadow: 8px 8px 0 #a9d6cd; padding: 1.5rem 1.6rem 1.1rem; position: relative; }
.sk-thread figcaption { font-family: var(--font-control); text-transform: uppercase; letter-spacing: .12em; font-size: .82rem; font-weight: 650; padding-bottom: 1.1rem; border-bottom: 1px solid var(--line); }
.sk-thread-body { padding: 1.2rem 0 0 2rem; position: relative; }
.sk-thread-step { display: flex; align-items: center; gap: 1rem; background: #e5eee4; border: 1px solid var(--line); padding: .9rem 1rem; position: relative; z-index: 1; }
.sk-thread-step.sk-step-2 { background: #fff0c8; }
.sk-thread-step.sk-step-3 { background: #d9e8ec; }
.sk-number { color: var(--green-dark); font-family: var(--font-control); font-size: .82rem; }
.sk-thread-step strong, .sk-thread-step div > span { display: block; }
.sk-thread-step strong { font-size: 1.08rem; line-height: 1.4; }
.sk-thread-step div > span { font-size: .9375rem; color: var(--ink-soft); margin-top: .15rem; }
.sk-thread-link { display: flex; gap: .7rem; align-items: center; margin-left: 1.35rem; font-size: .8125rem; color: var(--ink-soft); min-height: 2.25rem; }
.sk-thread-link i { height: 2.25rem; width: 1px; background: var(--green-dark); position: relative; }
.sk-thread-link i::after { content: ''; position: absolute; bottom: 0; left: -3px; border: 4px solid transparent; border-top-color: var(--green-dark); transform: translateY(4px); }
.sk-return { position: absolute; left: -.3rem; top: 3rem; bottom: 2rem; width: 2.6rem; }
.sk-return svg { width: 100%; height: 100%; overflow: visible; }
.sk-return path { fill: none; stroke: var(--green-dark); stroke-width: 1.5; vector-effect: non-scaling-stroke; }
.sk-thread-conclusion { font-size: .9375rem; margin: 1rem 0 .4rem; color: var(--ink-soft); }
.sk-replay { appearance: none; border: 0; padding: .45rem 0; background: transparent; color: var(--ink); font: inherit; font-size: .9rem; text-decoration: underline; text-underline-offset: .2em; cursor: pointer; }
.sk-section-nav { border-block: 1px solid var(--line); }
.sk-section-nav > div { display: flex; flex-wrap: wrap; gap: .7rem 2rem; padding-block: 1rem; }
.sk-section-nav a { font-size: .9375rem; font-weight: 600; text-decoration: none; }
body[data-surface="social-kernel"] .section { padding-block: clamp(3.5rem, 6vw, 5.5rem); }
body[data-surface="social-kernel"] h2 { font-size: clamp(1.9rem, 2.8vw, 2.75rem); line-height: 1.12; max-width: 21ch; }
body[data-surface="social-kernel"] h3 { font-size: 1.25rem; line-height: 1.3; }
.sk-section-head { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: end; margin-bottom: 2.5rem; }
.sk-section-head > p { margin: 0; max-width: 52ch; }
.sk-case-choices { display: grid; grid-template-columns: repeat(3, 1fr); border-bottom: 1px solid var(--line-strong); }
.sk-case-choice { display: flex; gap: .8rem; align-items: baseline; text-align: left; border: 0; background: transparent; color: var(--ink); padding: 1rem; font: 600 1rem var(--font-reading); cursor: pointer; border-bottom: 3px solid transparent; }
.sk-case-choice > span { font: .8125rem var(--font-control); color: var(--ink-soft); }
.sk-case-choice[aria-pressed="true"] { background: var(--sk-paper); border-bottom-color: var(--green-dark); }
.sk-case-choice:hover { background: #e1f0e6; }
.sk-case { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(2rem, 5vw, 4rem); padding: 2rem; border: 1px solid var(--line); border-top: 0; background: var(--sk-paper); }
.sk-case h3 { margin-top: 0; font-size: 1.55rem !important; }
.sk-case-copy p:last-child { color: var(--ink-soft); }
.sk-example-visual { padding: .5rem 0; }
.sk-example-source { display: flex; align-items: center; gap: .7rem; }
.sk-dot { width: .8rem; height: .8rem; border: 2px solid var(--green-dark); border-radius: 50%; }
.sk-example-route { display: flex; align-items: center; gap: .9rem; padding-left: .35rem; color: var(--ink-soft); font-size: .9375rem; }
.sk-example-route i { height: 3rem; width: 1px; background: var(--green-dark); }
.sk-example-result { display: flex; align-items: center; gap: 1.1rem; background: #fff0c8; border: 1px solid var(--line-strong); padding: 1.15rem; }
.sk-example-result svg { width: 72px; flex: 0 0 72px; fill: var(--sk-paper); stroke: var(--ink); stroke-width: 1.4; }
.sk-example-memory { border-left: 2px solid var(--green-dark); margin-top: 1.4rem; padding-left: 1rem; }
.sk-example-memory > span { font-size: .8125rem; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-soft); }
.sk-example-memory p { margin: .3rem 0 0; }
.sk-continuity, .sk-start-layout, .sk-related-layout { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 6vw, 5rem); }
.sk-records > div { display: grid; grid-template-columns: 7.5rem 1fr; gap: 1rem; padding-block: 1rem; border-bottom: 1px solid var(--line); }
.sk-records h3, .sk-records p { margin: 0; }
.sk-storage { font-size: .9375rem; color: var(--ink-soft); padding-top: 1.2rem; }
.sk-roles { margin: 0; }
.sk-role-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border: 1px solid var(--line-strong); }
.sk-role { padding: 1.6rem; background: #e2ece2; border-top: 4px solid var(--green-dark); }
.sk-role + .sk-role { border-left: 1px solid var(--line-strong); }
.sk-role:nth-child(2) { background: var(--sk-paper); border-top-color: #9a681d; }
.sk-role:nth-child(3) { background: #dcecef; border-top-color: #476e78; }
.sk-role > p:first-of-type { margin: .7rem 0 .3rem; font-size: .9375rem; color: var(--ink-soft); }
.sk-role h3 { margin: 0 0 .8rem; }
.sk-role p:last-child { margin: 0; }
.sk-host-note { display: grid; grid-template-columns: 1fr 1.7fr; gap: 2rem; border-top: 1px solid var(--line); padding-top: 1.5rem; margin-top: 1.5rem; }
.sk-host-note h3, .sk-host-note p { margin-top: 0; }
.sk-start { background: #f4e5b5; }
.sk-prompt { background: #fff9e9; padding: 1.8rem; border: 1px solid var(--line-strong); align-self: start; }
.sk-prompt blockquote { font-size: 1.05rem; line-height: 1.7; margin: 0; padding: 0; border: 0; }
.sk-prompt > p:last-child, .sk-contribution { font-size: .9375rem; color: var(--ink-soft); }
.sk-related nav { align-self: center; }
.sk-related nav a { display: flex; justify-content: space-between; gap: 1rem; padding: 1.2rem 0; border-bottom: 1px solid var(--line-strong); text-decoration: none; font-weight: 600; }
.sk-related nav a:hover { color: var(--green-dark); }
.sk-case-choice:focus-visible, .sk-replay:focus-visible { outline: 3px solid var(--focus); outline-offset: 4px; }
/* Motion marks causal order once. Content remains visible without JS or motion. */
@keyframes sk-emphasis { 0% { box-shadow: inset 4px 0 var(--green-dark); transform: translateY(5px); } 100% { box-shadow: inset 0 0 transparent; transform: none; } }
@keyframes sk-route { from { stroke-dashoffset: 420; } to { stroke-dashoffset: 0; } }
@media (prefers-reduced-motion: no-preference) {
  [data-sk-motion].sk-playing .sk-step-1 { animation: sk-emphasis 900ms ease-out; }
  [data-sk-motion].sk-playing .sk-step-2 { animation: sk-emphasis 900ms 550ms ease-out; }
  [data-sk-motion].sk-playing .sk-step-3 { animation: sk-emphasis 900ms 1100ms ease-out; }
  .sk-thread.sk-playing .sk-return path:first-child { stroke-dasharray: 420; animation: sk-route 1500ms 1500ms both ease-out; }
  .sk-case.sk-entering .sk-example-route i { animation: sk-emphasis 650ms ease-out; }
}
@media (max-width: 900px) {
  .sk-hero-layout { gap: 2rem; grid-template-columns: 1fr 1fr; }
  .sk-thread { padding: 1.1rem; }
  .sk-thread-step { padding: .7rem; gap: .65rem; }
  .sk-case { padding: 1.5rem; }
  .sk-role { padding: 1.1rem; }
}
@media (max-width: 700px) {
  .sk-hero-layout, .sk-section-head, .sk-case, .sk-continuity, .sk-start-layout, .sk-related-layout, .sk-host-note { grid-template-columns: 1fr; gap: 1.8rem; }
  .sk-hero { padding-top: 2rem; }
  .sk-hero .breadcrumb { margin-bottom: 1.5rem; }
  .sk-thread { margin-right: 8px; }
  .sk-lead { max-width: 30ch; }
  .sk-section-nav > div { gap: .75rem 1.4rem; }
  .sk-case-choices { grid-template-columns: 1fr; }
  .sk-case-choice { padding: .85rem; border-bottom-width: 2px; }
  .sk-case { padding: 1.25rem; }
  .sk-role-grid { grid-template-columns: 1fr; }
  .sk-role + .sk-role { border-left: 0; }
  .sk-records > div { grid-template-columns: 1fr; gap: .4rem; }
  .sk-prompt { padding: 1.25rem; }
  .sk-hero h1 { overflow-wrap: anywhere; }
}
@media (forced-colors: active) {
  .sk-thread, .sk-thread-step, .sk-example-result, .sk-role, .sk-prompt { border: 1px solid CanvasText; box-shadow: none; }
  .sk-case-choice[aria-pressed="true"] { border-color: Highlight; }
  .sk-return path, .sk-example-result svg { stroke: CanvasText; }
}