:root {
  --echoes-panel: rgba(6, 6, 8, 0.92);
  --echoes-panel-strong: rgba(10, 10, 12, 0.96);
  --echoes-border: rgba(255, 255, 255, 0.08);
  --echoes-border-strong: rgba(255, 255, 255, 0.2);
  --echoes-gradient: linear-gradient(145deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.015));
  --echoes-highlight: rgba(255, 255, 255, 0.08);
  --echoes-card-radius: 22px;
  --echoes-gutter: clamp(1rem, 2vw, 1.5rem);
  --echoes-ink: #f5f5f5;
  --echoes-ink-muted: #b5b5b5;
}

.echoes-shell {
  position: relative;
  z-index: 2;
  max-width: min(1040px, 100%);
  margin: clamp(1.5rem, 4vw, 3rem) auto clamp(2.5rem, 5vw, 4rem);
  padding: clamp(1.5rem, 3vw, 3rem);
  background: linear-gradient(160deg, var(--echoes-panel), var(--echoes-panel-strong)), var(--echoes-gradient);
  border: 1px solid var(--echoes-border);
  border-radius: var(--framework-radius);
  box-shadow: var(--framework-shadow);
  backdrop-filter: blur(14px);
}

.echoes-page__header {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
}

.echoes-page__header h1 {
  margin: 0;
  color: var(--framework-heading);
}

.echoes-page__header p {
  margin: 0;
  color: var(--framework-text);
}

.echoes-page__eyebrow,
.echoes-grid__eyebrow {
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--framework-muted);
  font-weight: 700;
  font-size: 0.9rem;
}

.echoes-layout {
  display: grid;
  gap: var(--echoes-gutter);
  align-items: start;
  grid-template-columns: minmax(260px, 0.8fr) 2.2fr;
}

.echoes-uplinks {
  position: sticky;
  top: clamp(0.5rem, 2vw, 1.5rem);
  right: auto;
  left: auto;
  width: 100%;
  max-width: none;
  padding: clamp(0.9rem, 2vw, 1.35rem);
  text-align: left;
  background: linear-gradient(220deg, rgba(8, 8, 10, 0.94), rgba(4, 4, 6, 0.9));
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: 0 18px 38px rgba(0, 0, 0, 0.48);
}

.echoes-uplinks h2 {
  margin-bottom: 0.15rem;
}

.echoes-uplinks__note {
  margin: 0 0 0.75rem;
  color: var(--framework-text);
  font-size: 0.95rem;
}

.echoes-uplinks ul {
  justify-items: start;
  width: 100%;
}

.echoes-grid {
  display: flex;
  flex-direction: column;
  gap: clamp(1rem, 2vw, 1.5rem);
}

.echoes-grid__header h2 {
  margin: 0.1rem 0;
  color: var(--framework-heading);
}

.echoes-grid__lede {
  margin: 0;
  color: var(--framework-text);
  max-width: 72ch;
}

.echoes-grid__lede strong {
  color: var(--echoes-ink);
}

.echoes-article__header {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: clamp(1.25rem, 3vw, 1.75rem);
}

.echoes-article__breadcrumbs {
  font-size: 0.95rem;
}

.echoes-article__breadcrumbs-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  padding: 0;
  margin: 0;
  list-style: none;
  color: var(--framework-muted);
}

.echoes-article__breadcrumbs a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 150ms ease, border-color 150ms ease;
}

.echoes-article__breadcrumbs a:hover,
.echoes-article__breadcrumbs a:focus-visible {
  color: var(--framework-accent);
  border-color: currentColor;
  outline: none;
}

.echoes-article__breadcrumbs-list li + li::before {
  content: "/";
  display: inline-block;
  margin-right: 0.5rem;
  color: var(--echoes-border-strong);
}

.echoes-article__breadcrumbs [aria-current="page"] {
  font-weight: 700;
  color: var(--framework-text);
}

.echoes-shell[data-echo-slug="liability-over-physics"] {
  font-size: clamp(1.05rem, 1rem + 0.25vw, 1.2rem);
}

.echoes-shell[data-echo-slug="liability-over-physics"] .echoes-article__body {
  line-height: 1.9;
}

.echoes-article__author {
  margin: 0;
  color: var(--framework-muted);
  font-family: var(--framework-font-sans);
  letter-spacing: 0.02em;
}

.echoes-section {
  position: relative;
  isolation: isolate;
}

.echoes-article__nav {
  margin-top: clamp(2rem, 4vw, 3rem);
}

.echoes-article__nav-list {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.echoes-article__nav-item {
  height: 100%;
}

.echoes-article__nav-card {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  height: 100%;
  padding: 0.9rem 1rem;
  border-radius: 14px;
  box-shadow: var(--framework-shadow);
  color: inherit;
  text-decoration: none;
  border: 1px solid transparent;
  transition: border-color 150ms ease, background-color 150ms ease;
}

.echoes-article__nav-card:hover,
.echoes-article__nav-card:focus-visible {
  border-color: var(--echoes-border-strong);
  background: var(--echoes-highlight);
  outline: none;
}

.echoes-article__nav .echo-title {
  font-size: 1rem;
}

.echoes-article__nav .echo-meta {
  font-size: 0.85rem;
}

.echoes-article__nav .echo-summary {
  margin: 0.35rem 0 0.15rem;
  font-size: 0.95rem;
}

.echoes-article__nav-link {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.1rem;
  border: 1px solid var(--echoes-border);
  border-radius: 999px;
  color: var(--framework-accent);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: border-color 150ms ease, background-color 150ms ease, color 150ms ease;
}

.echoes-article__nav .echoes-article__nav-link {
  margin-top: 0.1rem;
  padding: 0.45rem 0.85rem;
  font-size: 0.95rem;
}

.echoes-article__nav-link:hover,
.echoes-article__nav-link:focus-visible {
  border-color: var(--echoes-border-strong);
  color: var(--framework-heading);
  background: var(--echoes-highlight);
  outline: none;
}

.echoes-cta {
  margin-top: clamp(2rem, 4vw, 3rem);
}

.echoes-cta__header {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: clamp(1rem, 2vw, 1.5rem);
}

.echoes-cta__eyebrow {
  margin: 0;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--framework-muted);
  font-weight: 700;
  font-size: 0.95rem;
}

.echoes-cta__header h2 {
  margin: 0;
  color: var(--framework-heading);
}

.echoes-cta__lede {
  margin: 0;
  color: var(--framework-text);
  max-width: 68ch;
}

.echoes-cta__list {
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  align-items: stretch;
}

.echoes-cta__card {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  height: 100%;
  color: inherit;
  text-decoration: none;
  position: relative;
  z-index: 1;
}

.echoes-cta__card .echo-meta {
  margin: 0;
  color: var(--framework-muted);
}

.echoes-cta__card .echo-title {
  line-height: 1.35;
}

.echoes-cta__card .echo-header {
  margin-bottom: 0.25rem;
}

.echoes-cta__card .echo-summary {
  margin: 0.35rem 0 0;
  color: var(--framework-text);
}

.echoes-cta__card:focus-visible {
  outline: 2px solid var(--echoes-border-strong);
  outline-offset: 3px;
}

.echoes-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(1rem, 2vw, 1.5rem);
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.echo {
  background: linear-gradient(140deg, rgba(12, 12, 14, 0.95), rgba(16, 16, 18, 0.92)), var(--echoes-gradient);
  border: 1px solid var(--echoes-border);
  border-radius: var(--echoes-card-radius);
  padding: clamp(1.25rem, 2vw, 1.75rem);
  position: relative;
  overflow: hidden;
  box-shadow: var(--framework-volumetric-shadow);
  transition: transform 200ms ease, border-color 200ms ease, box-shadow 200ms ease;
  height: 100%;
}

.echo::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 15% 15%, rgba(255, 255, 255, 0.04), transparent 40%),
    radial-gradient(circle at 80% 10%, rgba(255, 255, 255, 0.03), transparent 48%);
  opacity: 0.5;
  pointer-events: none;
  z-index: 0;
}

.echo:hover,
.echo:focus-within {
  transform: translateY(-2px);
  border-color: var(--echoes-border-strong);
  box-shadow: var(--framework-volumetric-shadow-strong);
}

.echo-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  margin-bottom: 0.5rem;
  position: relative;
  z-index: 1;
}

.echo-title {
  margin: 0;
  font-size: clamp(1.15rem, 1vw + 1rem, 1.4rem);
  color: var(--echoes-ink);
}

.echo-link {
  color: inherit;
  text-decoration: none;
}

.echo-link:focus-visible {
  outline: 3px solid rgba(0, 255, 255, 0.8);
  outline-offset: 4px;
  border-radius: 6px;
  background: rgba(0, 255, 255, 0.08);
  box-shadow: 0 0 0 2px rgba(12, 18, 26, 0.6);
}

.echo-meta {
  font-family: var(--framework-font-sans);
  margin: 0;
  color: var(--echoes-ink-muted);
  letter-spacing: 0.03em;
  font-size: 0.9rem;
}

.echo-summary {
  position: relative;
  z-index: 1;
  margin: 0.5rem 0 0.25rem;
  color: var(--echoes-ink);
}

.echo-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  align-items: center;
  margin: 0.85rem 0 0.35rem;
  position: relative;
  z-index: 1;
}

.echo-preview__button,
.echo-read__link {
  font-family: var(--framework-font-sans);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.85rem;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  border: 1px solid var(--echoes-border);
  background: rgba(255, 255, 255, 0.02);
  color: var(--echoes-ink);
  text-decoration: none;
  transition: border-color 150ms ease, transform 150ms ease, background-color 150ms ease;
}

.echo-preview__button:hover,
.echo-preview__button:focus-visible,
.echo-read__link:hover,
.echo-read__link:focus-visible {
  border-color: var(--echoes-border-strong);
  background: var(--echoes-highlight);
  transform: translateY(-1px);
  outline: none;
}

.echo-preview__button:active,
.echo-read__link:active {
  transform: translateY(0);
}

.echo-tags {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  list-style: none;
  padding: 0;
  margin: 0.75rem 0 0;
  color: var(--echoes-ink-muted);
  letter-spacing: 0.02em;
}

.echo-tags li {
  padding: 0.25rem 0.55rem;
  border: 1px solid var(--echoes-border);
  border-radius: 999px;
  font-size: 0.9rem;
  background: rgba(20, 20, 22, 0.8);
}

.echo-body {
  margin-top: 1rem;
  border-top: 1px solid var(--echoes-border);
  padding-top: 1rem;
  color: var(--framework-text);
}

.echo-body h4 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.echo-body ul,
.echo-body ol {
  padding-left: 1.25rem;
  margin: 0.25rem 0 0;
}

.echo-body li + li {
  margin-top: 0.35rem;
}

.echoes-overlay[hidden] {
  display: none !important;
}

.echoes-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  display: grid;
  place-items: center;
  padding: clamp(1rem, 3vw, 2rem);
}

.echoes-overlay__scrim {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 20%, rgba(255, 255, 255, 0.05), transparent 45%),
    linear-gradient(180deg, rgba(5, 5, 6, 0.9), rgba(4, 4, 5, 0.96));
  backdrop-filter: blur(6px);
}

.echoes-overlay__panel {
  position: relative;
  max-width: min(860px, 100%);
  width: min(860px, 100%);
  background: linear-gradient(160deg, rgba(10, 10, 12, 0.96), rgba(6, 6, 8, 0.94));
  border: 1px solid var(--echoes-border-strong);
  border-radius: var(--framework-radius);
  box-shadow: var(--framework-shadow);
  padding: clamp(1.25rem, 2vw, 1.75rem);
  overflow: hidden;
}

.echoes-overlay__panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02));
  opacity: 0.35;
  pointer-events: none;
}

.echoes-overlay__close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  border: 1px solid var(--echoes-border);
  background: rgba(0, 0, 0, 0.7);
  color: var(--echoes-ink);
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  font-family: var(--framework-font-sans);
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: border-color 150ms ease, transform 150ms ease;
  z-index: 2;
}

.echoes-overlay__close:hover,
.echoes-overlay__close:focus-visible {
  border-color: var(--echoes-border-strong);
  transform: translateY(-1px);
  outline: none;
}

.echoes-overlay__content {
  position: relative;
  z-index: 1;
  color: var(--echoes-ink);
  line-height: var(--framework-line-height);
  max-height: min(70vh, 760px);
  overflow-y: auto;
  padding-right: 0.4rem;
}

.echoes-overlay__content h4 {
  margin-top: 0;
  color: var(--echoes-ink);
}

.echoes-overlay__content a {
  color: var(--echoes-ink);
  text-decoration-color: rgba(255, 255, 255, 0.5);
}

.echo-preview-card {
  display: grid;
  gap: 0.85rem;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01));
  border: 1px solid var(--echoes-border-strong);
  border-radius: calc(var(--echoes-card-radius) + 4px);
  padding: clamp(1.1rem, 2vw, 1.5rem);
  position: relative;
  overflow: hidden;
}

.echo-preview-card::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: calc(var(--echoes-card-radius) + 2px);
  pointer-events: none;
}

.echo-preview__eyebrow {
  margin: 0;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--echoes-ink-muted);
}

.echo-preview__title {
  margin: 0;
  font-size: clamp(1.35rem, 1.2rem + 0.4vw, 1.7rem);
  color: var(--echoes-ink);
}

.echo-preview__meta {
  margin: 0;
  color: var(--echoes-ink-muted);
  font-family: var(--framework-font-sans);
  letter-spacing: 0.03em;
}

.echo-preview__summary {
  margin: 0;
  color: var(--echoes-ink);
}

.echo-preview__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  list-style: none;
  padding: 0;
  margin: 0;
  color: var(--echoes-ink-muted);
}

.echo-preview__tags li {
  border: 1px solid var(--echoes-border);
  border-radius: 999px;
  padding: 0.25rem 0.55rem;
}

.echo-preview__actions {
  display: inline-flex;
  gap: 0.65rem;
  align-items: center;
  margin-top: 0.35rem;
}

.echo-preview__cta,
.echo-preview__visit {
  font-family: var(--framework-font-sans);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.85rem;
  padding: 0.55rem 1.1rem;
  border-radius: 999px;
  border: 1px solid var(--echoes-border);
  background: rgba(255, 255, 255, 0.02);
  color: var(--echoes-ink);
  text-decoration: none;
  transition: border-color 150ms ease, transform 150ms ease, background-color 150ms ease;
}

.echo-preview__cta:hover,
.echo-preview__cta:focus-visible,
.echo-preview__visit:hover,
.echo-preview__visit:focus-visible {
  border-color: var(--echoes-border-strong);
  background: var(--echoes-highlight);
  transform: translateY(-1px);
  outline: none;
}

#echoes-cortex {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1;
}

.echoes-canvas__link {
  position: fixed;
  inset: 0;
  display: block;
  z-index: 1;
}

.echoes-canvas__link:focus-visible {
  outline: 2px solid var(--framework-accent, #00ffd0);
  outline-offset: 8px;
}

@media (max-width: 720px) {
  .echoes-layout {
    grid-template-columns: 1fr;
  }

  .echoes-uplinks {
    position: relative;
    top: 0;
    order: -1;
  }

  .echoes-shell {
    padding: 1.25rem;
  }

  .echoes-overlay {
    align-items: flex-start;
  }

  .echoes-overlay__panel {
    width: 100%;
    max-height: 88vh;
  }

  .echoes-overlay__content {
    max-height: 70vh;
  }
}

@media (prefers-reduced-motion: reduce) {
  #echoes-cortex {
    display: none;
  }

  .echo,
  .echoes-overlay__close,
  .echoes-article__nav-link {
    transition: none;
  }
}