/* ─────────────────────────────────────────────────────────────────────────
   EIDETIC LABS · styles.css
   Memory and governance for agent work · brand: Eidetic Labs
   Lavender on paper / lavender on ink. Poppins display + system mono.
   Style language carried from craik.eidetic-labs.com — refined for the
   parent brand and the E-mark of three layered bars.
   ───────────────────────────────────────────────────────────────────────── */

/* ───────── Fonts ───────── */
@font-face {
  font-family: 'Eidetic Poppins';
  font-style: normal;
  font-weight: 300;
  font-display: swap;
  src: url('/assets/fonts/Poppins-Light.ttf') format('truetype');
}
@font-face {
  font-family: 'Eidetic Poppins';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('/assets/fonts/Poppins-Regular.ttf') format('truetype');
}
@font-face {
  font-family: 'Eidetic Poppins';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('/assets/fonts/Poppins-Medium.ttf') format('truetype');
}
@font-face {
  font-family: 'Eidetic Poppins';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('/assets/fonts/Poppins-Bold.ttf') format('truetype');
}

/* ───────── Tokens (from brand dev-tokens) ───────── */
:root {
  --ink: #0a0a0a;
  --paper: #ffffff;
  --lavender: #b4ace6;
  --lavender-deep: #7c72c7;
  --lavender-tint: #eae6f8;
  --grey-900: #1a1a1a;
  --grey-700: #4a4a4a;
  --grey-400: #a0a0a0;
  --grey-200: #e5e5e5;
  --grey-100: #f4f4f4;

  --bg: var(--paper);
  --bg-elevated: #fbfbfd;
  --bg-sunk: #f6f5fb;
  --fg: var(--ink);
  --fg-dim: var(--grey-700);
  --fg-mute: var(--grey-400);
  --rule: rgba(10, 10, 10, 0.08);
  --rule-strong: rgba(10, 10, 10, 0.16);
  --ink-soft: rgba(10, 10, 10, 0.55);
  --mark-fill: var(--ink);
  --accent: var(--lavender-deep);

  --font-sans: 'Eidetic Poppins', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', ui-monospace, Menlo, Monaco, 'Berkeley Mono', 'Cascadia Mono', Consolas, monospace;

  --max: 1240px;
  --gutter: clamp(20px, 4vw, 48px);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
}

html[data-theme='dark'] {
  --bg: var(--ink);
  --bg-elevated: #131316;
  --bg-sunk: #0e0e12;
  --fg: var(--paper);
  --fg-dim: rgba(255, 255, 255, 0.72);
  --fg-mute: rgba(255, 255, 255, 0.48);
  --rule: rgba(255, 255, 255, 0.1);
  --rule-strong: rgba(255, 255, 255, 0.22);
  --ink-soft: rgba(255, 255, 255, 0.6);
  --mark-fill: var(--paper);
  --accent: var(--lavender);
}

/* ───────── Reset / Base ───────── */
*, *::before, *::after { box-sizing: border-box; }

html {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-feature-settings: 'ss01', 'cv11', 'kern';
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
  text-rendering: optimizeLegibility;
  transition: background 240ms var(--ease), color 240ms var(--ease);
}
body { margin: 0; overflow-x: hidden; }
::selection { background: var(--lavender-tint); color: var(--ink); }
html[data-theme='dark'] ::selection { background: rgba(180, 172, 230, 0.36); color: var(--paper); }

a { color: inherit; text-decoration: none; transition: color 180ms var(--ease); }
img, svg { display: block; max-width: 100%; }
button { font: inherit; }

.skip-link {
  background: var(--ink);
  border-radius: var(--radius-sm);
  color: var(--paper);
  left: 12px;
  padding: 10px 14px;
  position: absolute;
  top: -100px;
  z-index: 100;
}
.skip-link:focus { top: 12px; }

/* ───────── Header ───────── */
.site-header {
  align-items: center;
  backdrop-filter: blur(22px) saturate(1.2);
  -webkit-backdrop-filter: blur(22px) saturate(1.2);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--rule);
  display: grid;
  gap: 24px;
  grid-template-columns: auto 1fr auto;
  left: 0;
  min-height: 64px;
  padding: 0 var(--gutter);
  position: fixed;
  right: 0;
  top: 0;
  transition: background 240ms var(--ease), border-color 240ms var(--ease);
  z-index: 50;
}

.brand {
  align-items: center;
  display: inline-flex;
  gap: 10px;
  letter-spacing: -0.01em;
}
.brand__mark {
  align-items: center;
  color: var(--fg);
  display: inline-flex;
  height: 30px;
  width: 30px;
  transition: transform 320ms var(--ease);
}
.brand:hover .brand__mark { transform: translateY(-1px); }
.brand__mark svg { overflow: visible; }
.brand__bar {
  transition: width 320ms var(--ease), x 320ms var(--ease), opacity 320ms var(--ease);
  transform-origin: left center;
}
.brand:hover .brand__bar--mid {
  /* On hover, the middle (lavender) bar momentarily extends, hinting at recall expanding */
  width: 80px;
}

.brand__wordmark {
  font-size: 1.06rem;
  font-weight: 500;
  letter-spacing: -0.005em;
}
.brand__by {
  color: var(--fg-mute);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  padding-left: 10px;
  margin-left: 6px;
  border-left: 1px solid var(--rule-strong);
}

.site-nav {
  align-items: center;
  display: flex;
  gap: 6px;
  justify-content: center;
}
.site-nav a {
  align-items: baseline;
  border-radius: 999px;
  color: var(--fg-dim);
  display: inline-flex;
  font-size: 0.86rem;
  font-weight: 500;
  gap: 6px;
  padding: 8px 14px;
  transition: background 160ms var(--ease), color 160ms var(--ease);
}
.site-nav a:hover { background: var(--bg-sunk); color: var(--fg); }
.site-nav a span {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.05em;
}

.header-controls {
  align-items: center;
  display: flex;
  gap: 10px;
  justify-self: end;
}
.theme-toggle {
  align-items: center;
  background: transparent;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  color: var(--fg);
  cursor: pointer;
  display: inline-flex;
  height: 36px;
  justify-content: space-around;
  padding: 0 8px;
  position: relative;
  transition: border-color 180ms var(--ease);
  width: 64px;
}
.theme-toggle:hover { border-color: var(--accent); }
.theme-toggle__thumb {
  background: var(--fg);
  border-radius: 999px;
  height: 22px;
  left: 6px;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  transition: transform 320ms var(--ease), background 240ms var(--ease);
  width: 22px;
}
html[data-theme='dark'] .theme-toggle__thumb {
  background: var(--lavender);
  transform: translateY(-50%) translateX(28px);
}
.theme-toggle__icon { height: 14px; position: relative; width: 14px; z-index: 1; }
.theme-toggle__icon--sun { color: var(--paper); }
.theme-toggle__icon--moon { color: var(--fg-mute); }
html[data-theme='dark'] .theme-toggle__icon--sun { color: var(--fg-mute); }
html[data-theme='dark'] .theme-toggle__icon--moon { color: var(--ink); }

.header-action {
  align-items: center;
  border: 1px solid var(--rule-strong);
  border-radius: 999px;
  display: inline-flex;
  font-size: 0.84rem;
  font-weight: 500;
  gap: 8px;
  padding: 8px 14px;
  transition: background 180ms var(--ease), border-color 180ms var(--ease), color 180ms var(--ease);
}
.header-action:hover {
  background: var(--fg);
  border-color: var(--fg);
  color: var(--bg);
}

/* ───────── Typography primitives ───────── */
.eyebrow {
  align-items: center;
  color: var(--accent);
  display: inline-flex;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  gap: 10px;
  letter-spacing: 0.12em;
  margin: 0;
  text-transform: uppercase;
}
.eyebrow__dot {
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 20%, transparent);
  display: inline-block;
  height: 6px;
  width: 6px;
}
.eyebrow__num {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border-radius: 4px;
  color: var(--accent);
  font-size: 0.66rem;
  padding: 3px 6px;
}

h1, h2, h3, h4, p { margin: 0; }
h1 em, h2 em, h3 em {
  color: var(--accent);
  font-family: var(--font-sans);
  font-style: normal;
  font-weight: 500;
  position: relative;
}
h1 em::after, h2 em::after {
  background: var(--lavender);
  border-radius: 999px;
  bottom: 0.1em;
  content: '';
  height: 8px;
  left: -2px;
  opacity: 0.32;
  position: absolute;
  right: -2px;
  z-index: -1;
}

/* ───────── Hero ───────── */
.hero {
  align-items: center;
  display: grid;
  gap: clamp(40px, 6vw, 80px);
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  margin: 0 auto;
  max-width: 1400px;
  min-height: 100vh;
  overflow: hidden;
  padding: clamp(128px, 14vw, 168px) var(--gutter) clamp(72px, 8vw, 112px);
  position: relative;
}
.hero__grid {
  background-image: radial-gradient(circle, var(--rule-strong) 1px, transparent 1px);
  background-size: 28px 28px;
  inset: 0;
  mask-image: radial-gradient(ellipse 80% 65% at 70% 40%, transparent 30%, rgba(0,0,0,0.7) 70%, black 100%);
  opacity: 0.45;
  pointer-events: none;
  position: absolute;
  z-index: 0;
}
.hero__copy, .hero__stage { position: relative; z-index: 1; }
.hero__copy { max-width: 640px; }

h1#hero-title {
  display: flex;
  flex-direction: column;
  font-size: clamp(3rem, 7.2vw, 6.4rem);
  font-weight: 300;
  letter-spacing: -0.03em;
  line-height: 0.96;
  margin: 24px 0 0;
}
.hero__line {
  display: block;
  opacity: 0;
  transform: translateY(18px);
  animation: lineIn 0.9s var(--ease) forwards;
}
.hero__line--a { animation-delay: 60ms; }
.hero__line--b { animation-delay: 220ms; color: var(--fg-dim); }
.hero__line--c { animation-delay: 380ms; font-weight: 500; }
@keyframes lineIn { to { opacity: 1; transform: translateY(0); } }

.hero__lede {
  color: var(--fg-dim);
  font-size: clamp(1.02rem, 1.2vw, 1.18rem);
  font-weight: 400;
  line-height: 1.7;
  margin-top: 32px;
  max-width: 58ch;
  opacity: 0;
  animation: lineIn 0.9s var(--ease) 540ms forwards;
}
.hero__lede strong { color: var(--fg); font-weight: 500; }

.hero__actions {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 36px;
  opacity: 0;
  animation: lineIn 0.9s var(--ease) 680ms forwards;
}

.button {
  align-items: center;
  border: 1px solid transparent;
  border-radius: 10px;
  cursor: pointer;
  display: inline-flex;
  font-family: var(--font-sans);
  font-size: 0.92rem;
  font-weight: 500;
  gap: 10px;
  letter-spacing: -0.005em;
  padding: 13px 20px;
  transition: background 200ms var(--ease), color 200ms var(--ease), border-color 200ms var(--ease), transform 200ms var(--ease);
}
.button:hover { transform: translateY(-1px); }
.button--primary { background: var(--fg); color: var(--bg); }
.button--primary:hover { background: var(--accent); color: var(--paper); }
.button--ghost { background: transparent; border-color: var(--rule-strong); color: var(--fg); }
.button--ghost:hover { border-color: var(--fg); }

.install-snippet {
  align-items: center;
  background: var(--bg-sunk);
  border: 1px solid var(--rule);
  border-radius: 10px;
  color: var(--fg);
  display: inline-flex;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  gap: 10px;
  padding: 11px 12px 11px 14px;
  position: relative;
  transition: border-color 180ms var(--ease);
}
.install-snippet:hover { border-color: var(--accent); }
.install-snippet__prompt { color: var(--accent); font-weight: 500; }
.install-snippet__cmd { color: var(--fg); }
.install-snippet__copy {
  align-items: center;
  background: transparent;
  border: 0;
  border-radius: 6px;
  color: var(--fg-mute);
  cursor: pointer;
  display: inline-flex;
  height: 26px;
  justify-content: center;
  position: relative;
  transition: background 160ms var(--ease), color 160ms var(--ease);
  width: 26px;
}
.install-snippet__copy:hover { background: var(--bg-elevated); color: var(--fg); }
.install-snippet__copy.is-copied::after {
  background: var(--ink);
  border-radius: 4px;
  color: var(--paper);
  content: 'copied';
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.08em;
  padding: 4px 6px;
  position: absolute;
  right: -4px;
  text-transform: uppercase;
  top: -28px;
}

.hero__stats {
  border-top: 1px solid var(--rule);
  display: grid;
  gap: 0;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 56px 0 0;
  padding-top: 24px;
}
.hero__stats > div + div { border-left: 1px solid var(--rule); padding-left: 18px; }
.hero__stats dt {
  color: var(--fg-mute);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  margin-bottom: 6px;
  text-transform: uppercase;
}
.hero__stats dd { color: var(--fg); font-size: 0.86rem; font-weight: 500; margin: 0; }

.pulse {
  background: #1bbf6e;
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(27, 191, 110, 0.5);
  display: inline-block;
  height: 7px;
  margin-right: 6px;
  vertical-align: middle;
  width: 7px;
  animation: pulse 1.8s var(--ease) infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(27, 191, 110, 0.55); }
  70% { box-shadow: 0 0 0 8px rgba(27, 191, 110, 0); }
  100% { box-shadow: 0 0 0 0 rgba(27, 191, 110, 0); }
}

/* ───────── Hero stage / E-mark SVG ───────── */
.hero__stage {
  aspect-ratio: 1;
  height: auto;
  justify-self: end;
  max-width: min(640px, 50vw);
  position: relative;
  width: 100%;
}
.mark-svg {
  height: 100%;
  width: 100%;
  filter: drop-shadow(0 30px 80px rgba(10, 10, 10, 0.08));
}
html[data-theme='dark'] .mark-svg {
  filter: drop-shadow(0 30px 80px rgba(124, 114, 199, 0.18));
}

.mark-svg__scans line { animation: scanFade 7s var(--ease) infinite; }
.mark-svg__scans line:nth-child(1) { animation-delay: 0.0s; }
.mark-svg__scans line:nth-child(2) { animation-delay: 0.6s; }
.mark-svg__scans line:nth-child(3) { animation-delay: 1.2s; }
.mark-svg__scans line:nth-child(4) { animation-delay: 1.8s; }
.mark-svg__scans line:nth-child(5) { animation-delay: 2.4s; }
.mark-svg__scans line:nth-child(6) { animation-delay: 3.0s; }
@keyframes scanFade {
  0%, 100% { stroke-opacity: 0.06; }
  50% { stroke-opacity: 0.22; }
}

.mark-svg__trace {
  stroke-dasharray: 80 480;
  stroke-dashoffset: 560;
  animation: trace 4.2s linear infinite;
}
@keyframes trace { to { stroke-dashoffset: 0; } }

.mark-bar {
  transform-origin: left center;
  transform-box: fill-box;
}
.mark-bar--top {
  animation: barIn 1.1s var(--ease) 60ms both;
}
.mark-bar--mid {
  animation: barIn 1.1s var(--ease) 260ms both, midBreath 5.6s var(--ease) 2s infinite;
}
.mark-bar--bot {
  animation: barIn 1.1s var(--ease) 460ms both;
}
@keyframes barIn {
  from { transform: scaleX(0); opacity: 0; }
  to   { transform: scaleX(1); opacity: 1; }
}
@keyframes midBreath {
  0%, 100% { transform: scaleX(1); }
  50%      { transform: scaleX(1.18); }
}

.mark-pulse {
  transform-origin: center;
  transform-box: fill-box;
  animation: dotPulse 2.6s var(--ease) infinite;
}
@keyframes dotPulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50%      { transform: scale(1.5); opacity: 0.6; }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.mark-svg__labels .mark-label rect {
  fill: var(--bg);
  stroke: var(--rule-strong);
  stroke-width: 1;
  transition: stroke 180ms var(--ease);
}
.mark-svg__labels .mark-label:hover rect { stroke: var(--accent); }
.mark-svg__labels .mark-label text { fill: var(--fg); }
.mark-svg__labels .mark-label__t { font-weight: 600; letter-spacing: 0.06em; }
.mark-svg__labels .mark-label__h { fill: var(--fg-mute); font-size: 9px; letter-spacing: 0.04em; }

/* ───────── Premise ───────── */
.premise {
  border-top: 1px solid var(--rule);
  margin: 0 auto;
  max-width: var(--max);
  padding: clamp(96px, 11vw, 144px) var(--gutter) clamp(64px, 8vw, 96px);
  position: relative;
}
.premise__inner {
  align-items: start;
  display: grid;
  gap: clamp(40px, 5vw, 72px);
  grid-template-columns: minmax(160px, 0.22fr) minmax(0, 1fr);
}
.premise__marker {
  align-items: center;
  color: var(--accent);
  display: inline-flex;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  gap: 12px;
  letter-spacing: 0.14em;
  position: sticky;
  text-transform: uppercase;
  top: 100px;
}
.premise__marker-dot {
  background: var(--lavender);
  border-radius: 50%;
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--lavender) 22%, transparent);
  display: inline-block;
  height: 7px;
  width: 7px;
}
.premise__body {
  display: flex;
  flex-direction: column;
  gap: clamp(36px, 4vw, 56px);
  max-width: 62ch;
}
.premise__setup {
  color: var(--fg-dim);
  font-size: clamp(1.18rem, 1.5vw, 1.42rem);
  font-weight: 300;
  letter-spacing: -0.005em;
  line-height: 1.5;
  margin: 0;
}
.premise__chip {
  background: var(--bg-sunk);
  border: 1px solid var(--rule);
  border-radius: 6px;
  color: var(--fg);
  font-family: var(--font-mono);
  font-size: 0.86em;
  font-weight: 500;
  letter-spacing: 0.01em;
  padding: 2px 9px;
  white-space: nowrap;
}
.premise__quote {
  display: grid;
  font-feature-settings: 'ss01';
  font-size: clamp(2.6rem, 6vw, 5.2rem);
  font-weight: 300;
  letter-spacing: -0.035em;
  line-height: 0.95;
  margin: 0;
  position: relative;
}
.premise__quote-mark {
  color: color-mix(in srgb, var(--lavender) 70%, transparent);
  font-family: 'Times New Roman', Georgia, serif;
  font-size: 4.5em;
  font-weight: 400;
  left: -0.7em;
  line-height: 0.85;
  pointer-events: none;
  position: absolute;
  top: -0.18em;
  user-select: none;
  z-index: -1;
}
html[data-theme='dark'] .premise__quote-mark {
  color: color-mix(in srgb, var(--lavender) 45%, transparent);
}
.premise__quote-line { color: var(--fg-dim); display: block; font-weight: 300; }
.premise__quote-line--accent {
  color: var(--fg);
  font-weight: 500;
  margin-top: 0.06em;
  position: relative;
}
.premise__quote-line--accent::after {
  background: var(--lavender);
  border-radius: 999px;
  bottom: -0.32em;
  content: '';
  height: 3px;
  left: 0;
  position: absolute;
  width: 64px;
}

.premise__resolution {
  color: var(--fg-dim);
  font-size: clamp(1.18rem, 1.5vw, 1.42rem);
  font-weight: 300;
  letter-spacing: -0.005em;
  line-height: 1.55;
  margin: 0;
}
.premise__verb {
  color: var(--fg);
  font-weight: 500;
  position: relative;
  white-space: nowrap;
}
.premise__verb::after {
  background: var(--lavender);
  bottom: -2px;
  content: '';
  height: 2px;
  left: 0;
  opacity: 0;
  position: absolute;
  right: 0;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 320ms var(--ease), opacity 320ms var(--ease);
}
.premise__resolution:hover .premise__verb::after,
.premise:hover .premise__verb::after { opacity: 1; transform: scaleX(1); }

.premise__ledger {
  border-top: 1px solid var(--rule);
  counter-reset: none;
  display: grid;
  font-family: var(--font-mono);
  list-style: none;
  margin: clamp(56px, 6vw, 88px) 0 0;
  padding: 0;
}
.premise__ledger li {
  align-items: baseline;
  border-bottom: 1px solid var(--rule);
  display: grid;
  font-size: 0.94rem;
  gap: clamp(14px, 2vw, 32px);
  grid-template-columns: 44px minmax(0, 1fr) 32px minmax(0, 1fr);
  letter-spacing: 0.005em;
  padding: clamp(18px, 1.6vw, 22px) 0;
  transition: background 240ms var(--ease);
}
.premise__ledger li:hover { background: var(--bg-sunk); }
.premise__ledger-num { color: var(--fg-mute); font-size: 0.7rem; font-weight: 500; letter-spacing: 0.14em; }
.premise__ledger-from { color: var(--fg-dim); }
.premise__ledger-arrow {
  color: var(--accent);
  font-size: 1.05rem;
  justify-self: center;
  transition: transform 320ms var(--ease);
}
.premise__ledger li:hover .premise__ledger-arrow { transform: translateX(4px); }
.premise__ledger-to { color: var(--fg); font-weight: 500; }

/* ───────── Generic section ───────── */
.section {
  margin: 0 auto;
  max-width: var(--max);
  padding: clamp(80px, 10vw, 144px) var(--gutter);
  position: relative;
}
.section__head {
  display: grid;
  gap: 20px;
  margin-bottom: clamp(48px, 6vw, 80px);
  max-width: 900px;
}
.section__head--center { margin-inline: auto; text-align: center; }
.section__head--center .eyebrow { margin-inline: auto; }
.section__head--split {
  align-items: end;
  display: grid;
  gap: 32px;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.55fr);
  max-width: var(--max);
}
.section__head h2 {
  font-size: clamp(2.1rem, 4.6vw, 4.2rem);
  font-weight: 300;
  letter-spacing: -0.025em;
  line-height: 1.02;
  max-width: 22ch;
}
.section__sub {
  color: var(--fg-dim);
  font-size: 1.04rem;
  line-height: 1.7;
  margin-top: 18px;
  max-width: 56ch;
}

/* ───────── Principles ───────── */
.principle-grid {
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.principle {
  background: var(--bg);
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(28px, 2.6vw, 40px);
  position: relative;
  transition: background 240ms var(--ease);
}
.principle:hover { background: var(--bg-elevated); }
.principle::before {
  background: var(--accent);
  content: '';
  height: 0;
  left: 0;
  position: absolute;
  top: 0;
  transition: height 320ms var(--ease);
  width: 2px;
}
.principle:hover::before { height: 100%; }
.principle__num {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
}
.principle h3 {
  font-size: 1.4rem;
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.15;
}
.principle p {
  color: var(--fg-dim);
  font-size: 0.96rem;
  line-height: 1.65;
}

/* ───────── The lab (about) ───────── */
.lab__inner {
  align-items: start;
  display: grid;
  gap: clamp(40px, 5vw, 72px);
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.85fr);
}
.lab__copy { display: flex; flex-direction: column; gap: 22px; max-width: 60ch; }
.lab__copy h2 {
  font-size: clamp(2rem, 4vw, 3.6rem);
  font-weight: 300;
  letter-spacing: -0.025em;
  line-height: 1.05;
  margin-top: 6px;
}
.lab__lede {
  color: var(--fg-dim);
  font-size: 1.06rem;
  line-height: 1.75;
}
.lab__actions {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 8px;
}

.lab__card {
  background: var(--bg-sunk);
  border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
  padding: clamp(24px, 2.4vw, 36px);
  position: relative;
}
.lab__card::before {
  background: var(--lavender);
  border-radius: 999px;
  content: '';
  height: 6px;
  position: absolute;
  right: 24px;
  top: 24px;
  width: 6px;
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--lavender) 22%, transparent);
}
.lab__card dl {
  display: grid;
  gap: 18px;
  margin: 0;
}
.lab__card dt {
  color: var(--fg-mute);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  margin-bottom: 4px;
  text-transform: uppercase;
}
.lab__card dd {
  color: var(--fg);
  font-size: 0.96rem;
  line-height: 1.55;
  margin: 0;
}
.lab__card dd em { color: var(--accent); font-style: italic; }

/* ───────── Footer ───────── */
.site-footer {
  border-top: 1px solid var(--rule);
  margin-top: clamp(48px, 6vw, 96px);
  padding: clamp(48px, 6vw, 72px) var(--gutter) clamp(36px, 4vw, 56px);
}
.site-footer__inner {
  display: grid;
  gap: clamp(28px, 3vw, 48px);
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
  margin: 0 auto;
  max-width: var(--max);
}
.brand--footer { gap: 12px; }
.brand--footer .brand__wordmark { font-size: 1rem; }

.site-footer__nav {
  display: grid;
  gap: 32px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}
.site-footer__nav div { display: flex; flex-direction: column; gap: 8px; }
.site-footer__group {
  color: var(--fg-mute);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  margin-bottom: 4px;
  text-transform: uppercase;
}
.site-footer__nav a {
  color: var(--fg-dim);
  font-size: 0.92rem;
  transition: color 160ms var(--ease);
}
.site-footer__nav a:hover { color: var(--fg); }
.site-footer__fine {
  border-top: 1px solid var(--rule);
  color: var(--fg-mute);
  display: flex;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  gap: 10px;
  grid-column: 1 / -1;
  letter-spacing: 0.06em;
  margin: 0;
  padding-top: 28px;
}
.site-footer__sep { color: var(--rule-strong); }

/* ───────── Product features (§02 Stigmem, §03 Craik) ───────── */
.product-feature {
  align-items: center;
  display: grid;
  gap: clamp(40px, 6vw, 80px);
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  margin: 0 auto;
  max-width: var(--max);
  padding: clamp(80px, 10vw, 144px) var(--gutter);
  position: relative;
}
.product-feature--reverse {
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
}
.product-feature--reverse .product-feature__copy { order: 1; }
.product-feature--reverse .product-feature__stage { order: 2; }
.product-feature:not(.product-feature--reverse) .product-feature__stage { order: 1; }
.product-feature:not(.product-feature--reverse) .product-feature__copy { order: 2; }

.product-feature__copy {
  display: flex;
  flex-direction: column;
  gap: 22px;
  max-width: 56ch;
}
.product-feature__head h2 {
  font-size: clamp(2rem, 4vw, 3.6rem);
  font-weight: 300;
  letter-spacing: -0.025em;
  line-height: 1.05;
  margin-top: 14px;
}
.product-feature__lede {
  color: var(--fg-dim);
  font-size: 1.06rem;
  line-height: 1.75;
}
.product-feature__features {
  border-top: 1px solid var(--rule);
  display: grid;
  gap: 10px 24px;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  list-style: none;
  margin: 4px 0 0;
  padding: 22px 0 0;
}
.product-feature__features li {
  align-items: center;
  color: var(--fg);
  display: flex;
  font-size: 0.94rem;
  gap: 10px;
}
.product-feature__features li::before {
  color: var(--accent);
  content: '◦';
  font-weight: 700;
}
.product-feature__actions {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.product-feature__status {
  color: var(--fg-mute);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  margin-top: 4px;
}

.product-feature__stage {
  aspect-ratio: 1;
  justify-self: center;
  max-width: min(420px, 42vw);
  position: relative;
  width: 100%;
}
.product-feature__stage svg {
  filter: drop-shadow(0 30px 60px rgba(10, 10, 10, 0.08));
  height: 100%;
  width: 100%;
}
html[data-theme='dark'] .product-feature__stage svg {
  filter: drop-shadow(0 30px 60px rgba(124, 114, 199, 0.18));
}

/* Stigmem visual: lavender disc + faint orbit dots */
.stigmem-mark__disc { fill: var(--lavender); }
.stigmem-mark__halo  { fill: url(#stigmem-halo); }
.stigmem-mark__orbit { fill: none; stroke: var(--accent); stroke-opacity: 0.18; stroke-dasharray: 2 6; transform-origin: 200px 200px; }
.stigmem-mark__orbit--1 { animation: spin 80s linear infinite; }
.stigmem-mark__orbit--2 { animation: spin 120s linear infinite reverse; }
.stigmem-mark__token rect { fill: var(--bg); stroke: var(--rule-strong); stroke-width: 1; }
.stigmem-mark__token text { fill: var(--fg); }
.stigmem-mark__token .t-label { font-weight: 600; letter-spacing: 0.06em; }
.stigmem-mark__pulse {
  animation: dotPulse 3.2s var(--ease) infinite;
  transform-box: fill-box;
  transform-origin: center;
}

/* Craik visual: open C arc + lavender dot + orbital node chips */
.craik-mark__arc  { fill: none; stroke: var(--mark-fill); stroke-width: 22; stroke-linecap: round; }
.craik-mark__dot  { fill: var(--lavender); }
.craik-mark__halo { fill: url(#craik-halo); }
.craik-mark__orbit { fill: none; stroke: var(--accent); stroke-opacity: 0.18; stroke-dasharray: 2 6; transform-origin: 200px 200px; }
.craik-mark__orbit--1 { animation: spin 110s linear infinite; }
.craik-mark__node rect { fill: var(--bg); stroke: var(--rule-strong); stroke-width: 1; }
.craik-mark__node text { fill: var(--fg); }
.craik-mark__node .n-label { font-weight: 600; letter-spacing: 0.06em; }
.craik-mark__pulse {
  animation: dotPulse 2.6s var(--ease) infinite;
  transform-box: fill-box;
  transform-origin: center;
}

/* ───────── Composition (§04) ───────── */
.composition__head {
  margin-inline: auto;
  max-width: 760px;
  text-align: center;
}
.composition__head .eyebrow { margin-inline: auto; }
.composition__framing,
.composition__resolution {
  color: var(--fg-dim);
  font-size: 1.06rem;
  line-height: 1.75;
  margin: clamp(28px, 3vw, 40px) auto 0;
  max-width: 62ch;
}
.composition__terminal {
  margin: clamp(36px, 4vw, 56px) 0;
}

/* ───────── Terminal artifact (used by §04 Composition) ───────── */
.terminal {
  background: var(--ink);
  border: 1px solid var(--rule);
  border-radius: var(--radius-md);
  box-shadow: 0 30px 90px rgba(10, 10, 10, 0.18);
  color: #f5f3ff;
  overflow: hidden;
}
html[data-theme='dark'] .terminal {
  background: #0a0a0e;
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
}
.terminal__chrome {
  align-items: center;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  gap: 8px;
  padding: 12px 14px;
}
.terminal__dot {
  border-radius: 50%;
  height: 10px;
  width: 10px;
}
.terminal__dot--r { background: #ff5f57; }
.terminal__dot--y { background: #febc2e; }
.terminal__dot--g { background: #28c840; }
.terminal__path {
  color: rgba(255, 255, 255, 0.45);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  margin-left: 14px;
}
.terminal__body {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  line-height: 1.7;
  padding: 22px 24px 28px;
}
.terminal__body p { margin: 0; }
.terminal__body .prompt {
  color: var(--lavender);
  margin-right: 8px;
}
.terminal__body .comment {
  color: rgba(255, 255, 255, 0.55);
  margin-bottom: 8px;
  padding-left: 22px;
}
.terminal__body .terminal__arg {
  color: #f5f3ff;
}

/* In-terminal mark utilities (§04 trace highlights) */
.terminal__body .mark-r {
  background: rgba(239, 106, 106, 0.18);
  border-radius: 3px;
  color: #ff9b9b;
  padding: 1px 5px;
}
.terminal__body .mark-l {
  background: rgba(180, 172, 230, 0.22);
  border-radius: 3px;
  color: var(--lavender);
  padding: 1px 5px;
}

/* ───────── Responsive ───────── */
@media (max-width: 1100px) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
    min-height: auto;
    padding-top: clamp(112px, 16vw, 144px);
  }
  .hero__stage { justify-self: center; max-width: 520px; }
  .lab__inner { grid-template-columns: minmax(0, 1fr); }
  .principle-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .product-feature,
  .product-feature--reverse {
    grid-template-columns: minmax(0, 1fr);
  }
  .product-feature .product-feature__stage,
  .product-feature--reverse .product-feature__stage {
    order: 1;
    max-width: min(360px, 70vw);
    margin-bottom: 8px;
  }
  .product-feature .product-feature__copy,
  .product-feature--reverse .product-feature__copy {
    order: 2;
  }
}

@media (max-width: 760px) {
  .site-header { gap: 12px; grid-template-columns: auto 1fr auto; padding: 0 16px; }
  .site-nav { display: none; }
  .brand__by { display: none; }
  .header-action span { display: none; }
  .header-action { padding: 8px; }

  h1#hero-title { font-size: clamp(2.6rem, 11vw, 4rem); }
  .hero__stats { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .hero__stats > div + div { border-left: none; border-top: 1px solid var(--rule); padding-left: 0; padding-top: 14px; }

  .premise__inner { grid-template-columns: minmax(0, 1fr); }
  .premise__marker { position: static; }
  .premise__ledger li {
    grid-template-columns: 30px minmax(0, 1fr);
    grid-template-areas: 'num from' '. to';
    gap: 6px 12px;
  }
  .premise__ledger-num { grid-area: num; }
  .premise__ledger-from { grid-area: from; }
  .premise__ledger-arrow { display: none; }
  .premise__ledger-to { grid-area: to; }

  .principle-grid { grid-template-columns: minmax(0, 1fr); }
  .product-feature__features { grid-template-columns: minmax(0, 1fr); }

  .site-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .site-footer__nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .section__head--split { grid-template-columns: minmax(0, 1fr); align-items: start; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0ms !important;
    scroll-behavior: auto !important;
  }
  .hero__line, .hero__lede, .hero__actions { opacity: 1; transform: none; }
}