/* Selfless Labs — tokens */
:root {
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(1.625rem, 1.1rem + 2.1vw, 3rem);
  --text-hero: clamp(2.5rem, 0.9rem + 5.6vw, 6.25rem);

  --space-1: 0.25rem; --space-2: 0.5rem; --space-3: 0.75rem; --space-4: 1rem;
  --space-5: 1.25rem; --space-6: 1.5rem; --space-8: 2rem; --space-10: 2.5rem;
  --space-12: 3rem; --space-16: 4rem; --space-20: 5rem; --space-24: 6rem; --space-32: 8rem;

  --font-display: 'Zodiak', 'Iowan Old Style', Georgia, serif;
  --font-body: 'Switzer', 'Helvetica Neue', Arial, sans-serif;

  /* brand palette: cream, ink, terracotta, ochre */
  --color-bg: #F6EFE4;
  --color-surface: #EFE6D8;
  --color-text: #2B211C;
  --color-text-muted: #6A5A4F;
  --color-primary: #A84A2C;      /* terracotta, deepened for small text */
  --color-numeral: #C65D3B;      /* brand terracotta, large type only */
  --color-rule: rgba(43, 33, 28, 0.16);
  --color-invert-bg: #2B211C;
  --color-invert-text: #F6EFE4;
  --color-invert-muted: #CDBFAE;
  --color-invert-accent: #E3A857;

  --radius-sm: 0.25rem;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-interactive: 180ms var(--ease);
  --wrap: 75rem;
  --gutter: clamp(var(--space-5), 5vw, var(--space-16));
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #2B211C;
    --color-surface: #33281F;
    --color-text: #F6EFE4;
    --color-text-muted: #CDBFAE;
    --color-primary: #E3A857;
    --color-numeral: #E3A857;
    --color-rule: rgba(246, 239, 228, 0.16);
    --color-invert-bg: #F6EFE4;
    --color-invert-text: #2B211C;
    --color-invert-muted: #6A5A4F;
    --color-invert-accent: #A84A2C;
  }
}

/* layout */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip {
  position: absolute;
  left: var(--space-4);
  top: -100px;
  z-index: 50;
  padding: var(--space-3) var(--space-4);
  background: var(--color-text);
  color: var(--color-bg);
  font-size: var(--text-sm);
}
.skip:focus { top: var(--space-4); }

a { color: inherit; }

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: oklch(from var(--color-bg) l c h / 0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color 300ms var(--ease);
}
.site-header.scrolled { border-bottom-color: var(--color-rule); }
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--space-20);
}
.brand {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}
.brand-logo {
  display: block;
  height: 2.5rem;
  width: auto;
}
.footer-symbol {
  display: block;
  height: 1.75rem;
  width: auto;
}
.nav { display: flex; gap: var(--space-6); }
.nav a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--color-text); }

/* hero */
.hero {
  min-height: calc(92dvh - var(--space-20));
  display: flex;
  align-items: center;
  padding-block: var(--space-16) var(--space-12);
}
.hero-title {
  font-family: var(--font-display);
  font-weight: 400;
  text-wrap: balance;
}
.hero-line-1 {
  display: block;
  font-size: var(--text-hero);
  line-height: 1.02;
  letter-spacing: -0.02em;
  max-width: 12.5em;
}
.hero-line-2 {
  display: block;
  margin-top: var(--space-8);
  font-size: var(--text-2xl);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--color-text-muted);
  max-width: 21em;
}
.cue {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-12);
  min-height: 44px;
  font-size: var(--text-sm);
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: 0.02em;
}
.cue:hover { color: var(--color-text); }

/* claims */
.claims { padding-block: var(--space-8) clamp(var(--space-16), 10vw, var(--space-32)); }
.claims-wrap { position: relative; }
.claim-list { position: relative; z-index: 1; }

.claim {
  max-width: none;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: var(--space-6);
  row-gap: var(--space-3);
  padding-block: clamp(var(--space-8), 5vw, var(--space-16));
  border-top: 1px solid var(--color-rule);
}
.claim:last-child { border-bottom: 1px solid var(--color-rule); }

.claim-head {
  grid-column: 1 / span 5;
  display: grid;
  grid-template-columns: auto 1fr;
  column-gap: var(--space-6);
  align-items: baseline;
  padding-left: var(--space-10);
}
.claim-num {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-numeral);
  font-variant-numeric: tabular-nums lining-nums;
  line-height: 1;
  position: relative;
}
.claim-name {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-xl);
  line-height: 1.1;
}
.claim-kind {
  grid-column: 2;
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 400ms var(--ease), transform 400ms var(--ease);
}
.claim-text {
  grid-column: 6 / span 7;
  font-size: var(--text-lg);
  line-height: 1.5;
  max-width: 40ch;
  padding-top: var(--space-1);
}

/* reveal on scroll (only when JS is running) */
.js .claim { opacity: 0; transition: opacity 900ms var(--ease); }
.js .claim.in { opacity: 1; }

/* falsifier band */
.falsifier {
  background: var(--color-invert-bg);
  color: var(--color-invert-text);
  padding-block: clamp(var(--space-20), 12vw, var(--space-32));
}
.falsifier-inner {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: var(--space-6);
}
.falsifier-title {
  grid-column: 1 / span 12;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-2xl);
  color: var(--color-invert-accent);
  line-height: 1.1;
}
.falsifier-text {
  grid-column: 1 / span 10;
  margin-top: var(--space-4);
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  line-height: 1.18;
  max-width: 28ch;
}

/* founders */
.founders { padding-block: clamp(var(--space-16), 9vw, var(--space-24)); }
.founders-inner {
  display: grid;
  grid-template-columns: 8rem minmax(0, 1fr);
  gap: var(--space-6) var(--space-10);
  align-items: start;
}
.founders-title, .contact-title { min-width: 8rem; }
.founders-title {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding-top: 0.55em;
}
.founders-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-8) var(--space-12);
}
.founder {
  display: grid;
  grid-template-columns: 6.5rem minmax(0, 1fr);
  gap: var(--space-5);
  align-items: start;
}
.founder-photo {
  width: 6.5rem;
  height: 6.5rem;
  border-radius: 50%;
  object-fit: cover;
  display: block;
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-text) 12%, transparent);
}
.founder-name {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-lg);
  line-height: 1.2;
}
.founder-role {
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.founder-line {
  margin-top: var(--space-3);
  max-width: 44ch;
  color: var(--color-text-muted);
  line-height: 1.6;
}
.founder-link {
  display: inline-block;
  margin-top: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  text-decoration-color: var(--color-primary);
  overflow-wrap: anywhere;
  transition: color var(--transition-interactive);
}
.founder-link:hover, .founder-link:focus-visible { color: var(--color-primary); }
@media (max-width: 47.99rem) {
  .founders-inner, .founders-list { grid-template-columns: 1fr; }
  .founders-title { padding-top: 0; }
  .founder { grid-template-columns: 5rem minmax(0, 1fr); }
  .founder-photo { width: 5rem; height: 5rem; }
}

/* contact */
.contact { padding-block: clamp(var(--space-16), 9vw, var(--space-24)); }
.contact-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-4) var(--space-10);
}
.contact-title {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.contact-link {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  text-decoration-color: var(--color-primary);
  overflow-wrap: anywhere;
}
.contact-link:hover { color: var(--color-primary); }

/* footer */
.site-footer { border-top: 1px solid var(--color-rule); }
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-2) var(--space-6);
  padding-block: var(--space-6) var(--space-10);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* "Show the model" toggle */
.model-bar {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: flex-end;
  margin-bottom: var(--space-4);
}
.model-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 44px;
  padding: var(--space-2) var(--space-4) var(--space-2) var(--space-3);
  border: 1px solid var(--color-rule);
  border-radius: 999px;
  background: var(--color-bg);
  font-size: var(--text-sm);
  color: var(--color-text);
}
.model-toggle:hover { border-color: var(--color-primary); }
.model-toggle:active { transform: scale(0.98); }
.toggle-track {
  position: relative;
  width: 2rem;
  height: 1.125rem;
  border-radius: 999px;
  border: 1px solid var(--color-text-muted);
  transition: background 300ms var(--ease), border-color 300ms var(--ease);
}
.toggle-dot {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 50%;
  background: var(--color-text-muted);
  transition: transform 300ms var(--ease), background 300ms var(--ease);
}
.model-toggle[aria-pressed="true"] .toggle-track { background: var(--color-primary); border-color: var(--color-primary); }
.model-toggle[aria-pressed="true"] .toggle-dot { transform: translateX(0.875rem); background: var(--color-bg); }
.no-js .model-bar { display: none; }

/* grid overlay */
.grid-overlay {
  position: fixed;
  inset: 0;
  z-index: 10;
  pointer-events: none;
  opacity: 0;
  transition: opacity 500ms var(--ease);
}
.grid-cols {
  height: 100%;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: var(--space-6);
}
.grid-cols span {
  border-inline: 1px solid oklch(from var(--color-primary) l c h / 0.22);
  background: oklch(from var(--color-primary) l c h / 0.035);
}

/* dependency lines */
.model-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
  z-index: 0;
  opacity: 0;
  transition: opacity 300ms var(--ease);
}
.show-model .model-lines { opacity: 1; }
.model-lines path {
  fill: none;
  stroke: var(--color-primary);
  stroke-width: 1.25;
  stroke-linecap: round;
  transition: stroke-dashoffset 1100ms var(--ease);
}
.model-lines circle { fill: var(--color-primary); opacity: 0; transition: opacity 500ms var(--ease); }

.show-model .grid-overlay { opacity: 1; }
.show-model .claim-kind { opacity: 1; transform: none; }
.show-model .model-lines circle { opacity: 1; }


/* claim links on the landing page */
.claim-name a { text-decoration: none; transition: color var(--transition-interactive); }
.claim-name a:hover { color: var(--color-primary); }
.claim-read {
  grid-column: 6 / span 7;
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-primary);
  text-decoration: none;
}
.claim-read span { transition: transform var(--transition-interactive); }
.claim-read:hover span { transform: translateX(4px); }

/* claim essay pages */
.essay-head {
  max-width: var(--wrap);
  padding-block: clamp(var(--space-12), 8vw, var(--space-24)) var(--space-10);
}
.essay-kicker {
  display: flex;
  align-items: baseline;
  gap: var(--space-4);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.essay-num {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  letter-spacing: 0;
  color: var(--color-numeral);
  font-variant-numeric: lining-nums;
}
.essay-title {
  margin-top: var(--space-4);
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-hero);
  line-height: 1.02;
  letter-spacing: -0.02em;
}
.essay-deck {
  margin-top: var(--space-6);
  max-width: 30ch;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  line-height: 1.25;
  color: var(--color-text-muted);
  text-wrap: pretty;
}
.essay-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-10);
  margin-top: var(--space-10);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-rule);
  font-size: var(--text-sm);
}
.meta-item { display: flex; flex-direction: column; gap: var(--space-1); max-width: 34ch; }
.essay-meta dt {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.essay-meta dd { margin: 0; }
.essay-meta a { color: var(--color-primary); text-underline-offset: 0.2em; }

.essay-body { padding-bottom: clamp(var(--space-12), 7vw, var(--space-20)); }
.prose {
  max-width: 68ch;
  font-size: var(--text-base);
  line-height: 1.7;
}
.prose > * + * { margin-top: var(--space-5); }
.prose h2 {
  margin-top: var(--space-16);
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-xl);
  line-height: 1.15;
}
.prose h2 + * { margin-top: var(--space-5); }
.prose p, .prose li { max-width: 68ch; }
.prose ul { padding-left: var(--space-5); list-style: disc; }
.prose ul li::marker { color: var(--color-numeral); }
.prose li + li { margin-top: var(--space-3); }
.prose strong { font-weight: 600; }
.prose a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--color-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  transition: color var(--transition-interactive);
}
.prose a:hover, .prose a:focus-visible { color: var(--color-primary); }
.prose .counter {
  padding: var(--space-5) var(--space-6);
  border-left: 3px solid var(--color-numeral);
  background: var(--color-surface);
}

.essay-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  padding-block: var(--space-10);
  border-top: 1px solid var(--color-rule);
}
.pn {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding-block: var(--space-4);
  text-decoration: none;
}
.pn-next { text-align: right; align-items: flex-end; }
.pn-label {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.pn-name {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  transition: color var(--transition-interactive);
}
.pn:hover .pn-name { color: var(--color-primary); }
.essay-back { padding-bottom: var(--space-16); font-size: var(--text-sm); }
.essay-back a { color: var(--color-primary); text-underline-offset: 0.2em; }

@media (max-width: 47.99rem) {
  .claim-read { grid-column: 1 / -1; margin-left: var(--space-8); }
  .essay-nav { grid-template-columns: 1fr; gap: 0; }
  .pn-next { text-align: left; align-items: flex-start; }
  .prose .counter { padding: var(--space-4); }
}

/* responsive */
@media (max-width: 47.99rem) {
  .claim { row-gap: var(--space-4); }
  .claim-head { grid-column: 1 / -1; padding-left: var(--space-8); column-gap: var(--space-4); }
  .claim-text { grid-column: 1 / -1; padding-left: var(--space-8); font-size: var(--text-base); max-width: none; }
  .claim-num { font-size: var(--text-lg); }
  .falsifier-text { grid-column: 1 / -1; }
  .grid-cols { grid-template-columns: repeat(4, minmax(0, 1fr)); column-gap: var(--space-4); }
  .grid-cols span:nth-child(n + 5) { display: none; }
  .hero { min-height: auto; padding-block: var(--space-16) var(--space-16); }
  .header-inner { gap: var(--space-4); }
  .nav { gap: var(--space-4); }
  .nav li:first-child { display: none; }
  .brand-logo { height: 1.875rem; }
  .claim-kind { display: none; }
  .show-model .claim-kind { display: block; }
}

/* essays */
.essays-head { padding-block: clamp(var(--space-12), 8vw, var(--space-20)) var(--space-4); }
.essays-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: var(--text-hero);
  line-height: 1.02;
  letter-spacing: -0.02em;
}
.essays-lede {
  margin-top: var(--space-5);
  max-width: 46ch;
  font-size: var(--text-lg);
  line-height: 1.45;
  color: var(--color-text-muted);
  text-wrap: pretty;
}
.essay-list .claim-head {
  grid-template-columns: 1fr;
  row-gap: var(--space-3);
  padding-left: 0;
  align-content: start;
}
.essay-list .claim-name { max-width: 18ch; text-wrap: balance; }
.essay-date {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
@media (max-width: 47.99rem) {
  .essay-list .claim-head, .essay-list .claim-text { padding-left: 0; }
  .essay-list .claim-name { max-width: none; }
  .essay-list .claim-read { margin-left: 0; }
}

@media print {
  .model-toggle, .grid-overlay, .model-lines, .site-header { display: none; }
  .js .claim { opacity: 1; }
}

/* contact page */
.contact-head { padding-bottom: clamp(var(--space-6), 3vw, var(--space-10)); }
.contact-page-email { margin-top: var(--space-8); }
.contact-page { min-height: 100vh; min-height: 100dvh; display: flex; flex-direction: column; }
.contact-page main { flex: 1; }