/* ============================================
   Absorption Pro — design system
   ============================================ */

:root {
  /* Color */
  --ink: #161513;
  --ink-soft: #3a3733;
  --ink-mute: #6b6660;
  --paper: #faf6ef;
  --paper-warm: #f3ede2;
  --rule: #e3dccd;
  --ledger: #1f4332;
  --ledger-soft: #2d5a44;

  /* Type scale */
  --display-xl: clamp(2.75rem, 5.5vw + 0.5rem, 5.25rem);
  --display-l: clamp(2rem, 3.5vw + 0.5rem, 3.25rem);
  --display-m: clamp(1.5rem, 2vw + 0.5rem, 2rem);
  --body-l: 1.1875rem;
  --body: 1.0625rem;
  --body-s: 0.9375rem;
  --caption: 0.8125rem;
  --eyebrow: 0.75rem;

  /* Spacing */
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --section: clamp(4rem, 8vw, 7rem);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: var(--body);
  line-height: 1.55;
  color: var(--ink);
  background: var(--paper);
  font-feature-settings: 'ss01', 'ss02', 'cv01';
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Typography
   ============================================ */

.serif {
  font-family: 'Fraunces', Georgia, serif;
  font-variation-settings: 'opsz' 144, 'SOFT' 50, 'WONK' 0;
  letter-spacing: -0.02em;
}

.mono {
  font-family: 'JetBrains Mono', ui-monospace, 'SF Mono', monospace;
  letter-spacing: -0.01em;
}

h1, h2, h3, h4 {
  font-family: 'Fraunces', Georgia, serif;
  font-variation-settings: 'opsz' 144, 'SOFT' 50, 'WONK' 0;
  letter-spacing: -0.025em;
  font-weight: 400;
  line-height: 1.05;
  color: var(--ink);
}

h1 {
  font-size: var(--display-xl);
  line-height: 1.0;
  letter-spacing: -0.035em;
}

h2 {
  font-size: var(--display-l);
  line-height: 1.1;
}

h3 {
  font-size: var(--display-m);
  font-weight: 500;
  line-height: 1.2;
}

p {
  font-size: var(--body);
  line-height: 1.6;
  color: var(--ink-soft);
}

p.lede {
  font-size: var(--body-l);
  line-height: 1.55;
  color: var(--ink);
  max-width: 36em;
}

.eyebrow {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: var(--eyebrow);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ledger);
  font-weight: 500;
}

a {
  color: var(--ledger);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--ink);
}

a.bare {
  border-bottom: none;
}

a.bare:hover {
  color: var(--ledger);
}

/* ============================================
   Layout primitives
   ============================================ */

.shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.measure {
  max-width: 38rem;
}

.measure-wide {
  max-width: 52rem;
}

/* ============================================
   Site header
   ============================================ */

.site-header {
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--rule);
}

.site-header .shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.wordmark {
  font-family: 'Fraunces', Georgia, serif;
  font-variation-settings: 'opsz' 144, 'SOFT' 30;
  font-size: 1.375rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--ink);
  border-bottom: none;
}

.wordmark .dot {
  display: inline-block;
  width: 0.4em;
  height: 0.4em;
  background: var(--ledger);
  border-radius: 50%;
  margin: 0 0.05em 0.15em 0.05em;
  vertical-align: middle;
}

.wordmark:hover {
  color: var(--ink);
}

.site-nav {
  display: flex;
  gap: 2rem;
  font-size: var(--body-s);
}

.site-nav a {
  color: var(--ink-soft);
  border-bottom: none;
  font-weight: 500;
}

.site-nav a:hover {
  color: var(--ledger);
}

@media (max-width: 600px) {
  .site-nav {
    gap: 1.25rem;
    font-size: 0.875rem;
  }
}

/* ============================================
   Hero
   ============================================ */

.hero {
  padding: clamp(3rem, 8vw, 6rem) 0 var(--section);
  position: relative;
}

.hero .eyebrow {
  margin-bottom: 1.5rem;
}

.hero h1 {
  margin-bottom: 2rem;
  max-width: 14ch;
}

.hero h1 em {
  font-style: italic;
  font-variation-settings: 'opsz' 144, 'SOFT' 50, 'WONK' 1;
  color: var(--ledger);
}

.hero .lede {
  margin-bottom: 3rem;
}

/* Cohort timeline visualization */
.cohort-viz {
  margin-top: 3rem;
  padding: 2rem 2rem 1.5rem;
  background: var(--paper-warm);
  border: 1px solid var(--rule);
  border-radius: 4px;
  max-width: 52rem;
  position: relative;
}

.cohort-viz .label {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--caption);
  color: var(--ink-mute);
  letter-spacing: 0.04em;
  display: flex;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.cohort-viz svg {
  width: 100%;
  height: auto;
  display: block;
}

.cohort-viz .footnote {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--caption);
  color: var(--ink-mute);
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--rule);
  letter-spacing: 0.02em;
}

/* ============================================
   Section construction
   ============================================ */

.section {
  padding: var(--section) 0;
  border-top: 1px solid var(--rule);
}

.section-head {
  display: grid;
  grid-template-columns: 1fr 2.5fr;
  gap: 3rem;
  margin-bottom: 3.5rem;
  align-items: baseline;
}

.section-head .eyebrow {
  padding-top: 0.65rem;
  border-top: 2px solid var(--ledger);
  display: inline-block;
  align-self: start;
  width: fit-content;
}

.section-head h2 {
  max-width: 18ch;
}

@media (max-width: 720px) {
  .section-head {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
}

/* ============================================
   What-it-does — three editorial blocks
   ============================================ */

.tenets {
  display: grid;
  gap: 0;
}

.tenet {
  display: grid;
  grid-template-columns: 1fr 2.5fr;
  gap: 3rem;
  padding: 2.5rem 0;
  border-top: 1px solid var(--rule);
}

.tenet:last-child {
  border-bottom: 1px solid var(--rule);
}

.tenet .number {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--caption);
  color: var(--ledger);
  letter-spacing: 0.08em;
}

.tenet h3 {
  margin-bottom: 0.75rem;
}

.tenet p {
  max-width: 38em;
}

.tenet .number-line {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.tenet .number-line .label {
  font-family: 'Fraunces', serif;
  font-variation-settings: 'opsz' 144;
  font-size: 1rem;
  color: var(--ink);
  font-style: italic;
  font-weight: 400;
}

@media (max-width: 720px) {
  .tenet {
    grid-template-columns: 1fr;
    gap: 0.75rem;
    padding: 2rem 0;
  }
}

/* ============================================
   Scope — what it is and isn't
   ============================================ */

.scope {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}

.scope-col h4 {
  font-family: 'Fraunces', serif;
  font-variation-settings: 'opsz' 144;
  font-size: 1.375rem;
  margin-bottom: 1.5rem;
  font-weight: 500;
}

.scope-col ul {
  list-style: none;
}

.scope-col li {
  font-size: var(--body);
  line-height: 1.5;
  color: var(--ink-soft);
  padding: 0.85rem 0;
  border-top: 1px dashed var(--rule);
  display: flex;
  gap: 1rem;
  align-items: baseline;
}

.scope-col li:last-child {
  border-bottom: 1px dashed var(--rule);
}

.scope-col li::before {
  content: '';
  width: 0.4rem;
  height: 0.4rem;
  flex-shrink: 0;
  border-radius: 50%;
  position: relative;
  top: 0.4rem;
}

.scope-col.in li::before {
  background: var(--ledger);
}

.scope-col.out li::before {
  background: var(--rule);
  border: 1px solid var(--ink-mute);
}

@media (max-width: 720px) {
  .scope {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

/* ============================================
   Beta CTA
   ============================================ */

.beta {
  background: var(--ink);
  color: var(--paper);
  padding: var(--section) 0;
  border-top: none;
}

.beta .eyebrow {
  color: var(--paper-warm);
  opacity: 0.7;
}

.beta h2 {
  color: var(--paper);
  margin-bottom: 1.5rem;
  max-width: 18ch;
}

.beta p {
  color: var(--paper-warm);
  opacity: 0.85;
  max-width: 36em;
  margin-bottom: 2.5rem;
}

.beta .cta {
  display: inline-flex;
  align-items: baseline;
  gap: 0.75rem;
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--body-s);
  letter-spacing: 0.04em;
  color: var(--paper);
  border-bottom: 1px solid var(--paper);
  padding: 0.4rem 0;
  transition: gap 0.2s ease, color 0.15s ease;
}

.beta .cta:hover {
  color: var(--paper-warm);
  gap: 1.25rem;
}

.beta .cta .arrow {
  font-family: 'Fraunces', serif;
  font-style: italic;
  font-size: 1.1em;
}

/* ============================================
   Footer
   ============================================ */

.site-footer {
  padding: 3rem 0 4rem;
  border-top: 1px solid var(--rule);
  background: var(--paper-warm);
}

.site-footer .shell {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  align-items: end;
}

.footer-mark {
  font-family: 'Fraunces', serif;
  font-variation-settings: 'opsz' 144, 'SOFT' 30;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.footer-mark .copyright {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--caption);
  color: var(--ink-mute);
  display: block;
  margin-top: 0.5rem;
  letter-spacing: 0.02em;
}

.footer-nav {
  display: flex;
  gap: 2rem;
  font-size: var(--body-s);
}

.footer-nav a {
  color: var(--ink-soft);
  border-bottom: none;
}

.footer-nav a:hover {
  color: var(--ledger);
}

@media (max-width: 600px) {
  .site-footer .shell {
    grid-template-columns: 1fr;
    gap: 2rem;
    align-items: start;
  }
  .footer-nav {
    flex-wrap: wrap;
    gap: 1.25rem;
  }
}

/* ============================================
   Document pages (terms, privacy)
   ============================================ */

.doc-page {
  padding: clamp(3rem, 6vw, 5rem) 0 var(--section);
}

.doc-page .doc-head {
  border-bottom: 1px solid var(--rule);
  padding-bottom: 2.5rem;
  margin-bottom: 3rem;
}

.doc-page .doc-head h1 {
  font-size: var(--display-l);
  max-width: 18ch;
  margin-bottom: 1rem;
}

.doc-page .doc-head .meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--caption);
  color: var(--ink-mute);
  letter-spacing: 0.04em;
}

.doc-page .body {
  max-width: 42rem;
}

.doc-page .body h2 {
  font-size: 1.5rem;
  font-weight: 500;
  margin: 3rem 0 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  letter-spacing: -0.015em;
}

.doc-page .body h2:first-child {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}

.doc-page .body h3 {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--ink);
  margin: 2rem 0 0.5rem;
}

.doc-page .body p {
  margin-bottom: 1rem;
  font-size: var(--body);
  color: var(--ink-soft);
}

.doc-page .body ul {
  margin: 1rem 0 1.5rem 1.25rem;
}

.doc-page .body li {
  font-size: var(--body);
  color: var(--ink-soft);
  margin-bottom: 0.5rem;
  line-height: 1.6;
}

.doc-page .body strong {
  color: var(--ink);
  font-weight: 600;
}

.doc-page .legal-note {
  background: var(--paper-warm);
  border-left: 3px solid var(--ledger);
  padding: 1.25rem 1.5rem;
  margin: 2rem 0 3rem;
  font-size: var(--body-s);
  font-style: italic;
  color: var(--ink-soft);
}

/* ============================================
   Contact page
   ============================================ */

.contact-page {
  padding: clamp(3rem, 6vw, 5rem) 0 var(--section);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 4rem;
  align-items: start;
}

.contact-grid h1 {
  font-size: var(--display-l);
  max-width: 12ch;
  margin-bottom: 1.5rem;
}

.contact-grid .lede {
  margin-bottom: 2.5rem;
}

.contact-channels {
  display: grid;
  gap: 1.5rem;
}

.channel {
  padding: 1.5rem 0;
  border-top: 1px solid var(--rule);
}

.channel:last-child {
  border-bottom: 1px solid var(--rule);
}

.channel .label {
  font-family: 'JetBrains Mono', monospace;
  font-size: var(--caption);
  color: var(--ledger);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.channel .value {
  font-family: 'Fraunces', serif;
  font-variation-settings: 'opsz' 144;
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: -0.02em;
  border-bottom: none;
}

.channel .value:hover {
  color: var(--ledger);
}

.channel .note {
  font-size: var(--body-s);
  color: var(--ink-mute);
  margin-top: 0.5rem;
}

@media (max-width: 720px) {
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

/* ============================================
   Subtle entrance
   ============================================ */

@media (prefers-reduced-motion: no-preference) {
  .hero h1,
  .hero .lede,
  .hero .eyebrow,
  .hero .cohort-viz {
    animation: rise 0.7s cubic-bezier(0.2, 0.8, 0.2, 1) backwards;
  }

  .hero .eyebrow { animation-delay: 0.05s; }
  .hero h1 { animation-delay: 0.15s; }
  .hero .lede { animation-delay: 0.3s; }
  .hero .cohort-viz { animation-delay: 0.45s; }

  @keyframes rise {
    from { opacity: 0; transform: translateY(0.75rem); }
    to { opacity: 1; transform: translateY(0); }
  }
}