:root {
  --paper: var(--theme-ui-colors-background);
  --ink: var(--theme-ui-colors-text);
  --muted: var(--theme-ui-colors-textMuted);
  --line: var(--theme-ui-colors-border);
  scroll-padding-top: 32px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--theme-ui-colors-accent);
  color: var(--ink);
}

a {
  color: inherit;
  text-underline-offset: 0.22em;
}

a:hover {
  color: var(--theme-ui-colors-secondary);
}

:focus-visible {
  outline: 2px solid var(--theme-ui-colors-focus);
  outline-offset: 5px;
}

svg {
  display: block;
  flex-shrink: 0;
}

p,
figure,
blockquote,
h1,
h2,
h3 {
  margin: 0;
}

h1,
h2,
h3 {
  font-family: var(--theme-ui-fonts-heading);
  font-weight: var(--theme-ui-fontWeights-heading);
  line-height: var(--theme-ui-lineHeights-heading);
  text-wrap: balance;
}

h1 {
  font-size: clamp(44px, 6vw, var(--theme-ui-fontSizes-7));
  letter-spacing: -0.055em;
}

h2 {
  font-size: var(--theme-ui-fontSizes-5);
  letter-spacing: -0.04em;
}

h3 {
  font-size: var(--theme-ui-fontSizes-2);
  letter-spacing: -0.02em;
}

.wrap {
  width: min(1080px, calc(100% - 96px));
  margin-inline: auto;
}

.eyebrow {
  color: var(--muted);
  font-size: var(--theme-ui-fontSizes-0);
  line-height: 1.5;
}

.skip-link {
  position: fixed;
  inset-block-start: 12px;
  inset-inline-start: 16px;
  z-index: 10;
  padding: 12px 20px;
  color: var(--paper);
  background: var(--ink);
  transform: translateY(-180%);
}

.skip-link:focus {
  color: var(--paper);
  transform: none;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.site-header,
.site-header nav,
.site-footer,
.site-footer nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--theme-ui-space-6);
}

.site-header {
  padding-block: 24px;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: var(--theme-ui-fontSizes-3);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.04em;
  text-decoration: none;
}

.companion {
  width: 30px;
  height: 30px;
}

.site-header nav a,
.site-footer nav a {
  padding-block: 8px;
  font-size: var(--theme-ui-fontSizes-0);
  text-decoration: none;
}

.site-header nav a:hover,
.site-footer nav a:hover,
a[aria-current="page"] {
  text-decoration: underline;
}

.hero {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  align-items: end;
  gap: 100px;
  padding-block: 100px 64px;
}

.hero h1 {
  max-width: 480px;
  margin-top: 24px;
}

.hero-intro {
  max-width: 410px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.55;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-size: var(--theme-ui-fontSizes-1);
  text-decoration: none;
}

.text-link:hover {
  text-decoration: underline;
}

.hero-intro .text-link {
  margin-top: 20px;
}

.study-stage {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  align-items: center;
  gap: 80px;
  padding: 56px;
  background: var(--theme-ui-colors-muted);
  border-radius: var(--theme-ui-radii-bubble);
}

.study-note h2 {
  max-width: 260px;
  margin-block: 16px;
  font-size: var(--theme-ui-fontSizes-4);
}

.study-note > p:not(.eyebrow) {
  font-size: var(--theme-ui-fontSizes-1);
  color: var(--muted);
}

.study-instruction {
  margin-top: 32px;
}

.study-instruction span {
  margin-inline-start: 8px;
}

.conversation {
  min-width: 0;
  padding: 24px 28px 28px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--theme-ui-radii-bubble);
}

.conversation-heading {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: var(--theme-ui-fontSizes-1);
  font-weight: 550;
}

.conversation-heading .companion {
  width: 24px;
  height: 24px;
}

.conversation-label {
  margin-inline-start: auto;
  color: var(--muted);
  font-size: var(--theme-ui-fontSizes-0);
  font-weight: 400;
}

.message-user {
  width: fit-content;
  max-width: 88%;
  margin-block: 36px 28px;
  margin-inline-start: auto;
  padding: 12px 16px;
  border-radius: var(--theme-ui-radii-bubble);
  background: var(--theme-ui-colors-bubble);
  font-size: var(--theme-ui-fontSizes-1);
  line-height: 1.5;
}

.message-author {
  margin-bottom: 8px;
  color: var(--muted);
  font-size: var(--theme-ui-fontSizes-0);
}

.message-agent > p:not(.message-author) {
  max-width: 360px;
  line-height: 1.5;
}

.place-card {
  margin-top: 20px;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}

.place-card-heading {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px;
}

.place-symbol {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  background: var(--theme-ui-colors-accent);
  border-radius: 8px;
}

.place-card-heading p {
  margin-top: 4px;
  color: var(--muted);
  font-size: var(--theme-ui-fontSizes-0);
}

summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 44px;
  list-style: none;
  cursor: pointer;
}

summary::-webkit-details-marker {
  display: none;
}

summary:focus-visible {
  outline-offset: -4px;
}

.details-icon {
  position: relative;
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.details-icon::before,
.details-icon::after {
  content: "";
  position: absolute;
  inset-block-start: 6px;
  inset-inline-start: 1px;
  width: 12px;
  height: 1px;
  background: currentColor;
}

.details-icon::after {
  transform: rotate(90deg);
}

details[open] .details-icon::after {
  transform: none;
}

.source-note {
  border-top: 1px solid var(--line);
  font-size: var(--theme-ui-fontSizes-0);
}

.source-note summary {
  padding: 12px 20px;
  color: var(--muted);
}

.source-content {
  margin: 0 20px 20px;
  padding-inline-start: 12px;
  border-inline-start: 2px solid var(--theme-ui-colors-memoryBorder);
}

.source-title {
  margin-bottom: 6px;
  font-weight: 550;
}

.source-content blockquote {
  color: var(--muted);
}

.study-followup {
  margin-top: 22px;
  color: var(--muted);
  font-size: var(--theme-ui-fontSizes-0);
}

.study-followup span {
  margin-inline-end: 6px;
}

.interface-study figcaption {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin: 12px 4px 0;
  color: var(--muted);
  font-size: var(--theme-ui-fontSizes-0);
}

.editorial-section {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 100px;
  padding-block: 64px;
  border-bottom: 1px solid var(--line);
}

.editorial-section h2 {
  max-width: 300px;
  margin-top: 16px;
}

.section-copy,
.privacy-notes {
  color: var(--muted);
}

.section-copy > p + p {
  margin-top: 20px;
}

.section-aside {
  max-width: 250px;
  margin-top: 16px;
  color: var(--muted);
  font-size: var(--theme-ui-fontSizes-1);
}

.privacy-notes article + article {
  margin-top: 28px;
}

.privacy-notes h3 {
  margin-bottom: 8px;
  color: var(--ink);
}

.recovery-note {
  margin-top: 28px;
  border-block: 1px solid var(--line);
  font-size: var(--theme-ui-fontSizes-1);
}

.recovery-note summary {
  padding-block: 16px;
  color: var(--ink);
}

.details-content {
  padding-bottom: 20px;
}

.privacy-caveat {
  margin-top: 20px;
  font-size: var(--theme-ui-fontSizes-0);
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  margin-top: 24px;
}

.building-section {
  border-bottom: 0;
}

.site-footer {
  padding-block: 28px 40px;
  border-top: 1px solid var(--line);
}

.site-footer > p {
  margin-inline-end: auto;
  color: var(--muted);
  font-size: var(--theme-ui-fontSizes-0);
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  min-height: 48px;
  padding: 12px 20px;
  border-radius: var(--theme-ui-radii-control);
  font-size: var(--theme-ui-fontSizes-1);
  text-decoration: none;
}

.button svg {
  width: 18px;
  height: 18px;
}

.not-found {
  padding-block: 100px 120px;
}

.not-found > .companion {
  width: 96px;
  height: 96px;
  margin-bottom: 32px;
}

.not-found h1,
.not-found > p:not(.eyebrow),
.not-found .button {
  margin-top: 24px;
}

@media (max-width: 900px) {
  .hero,
  .editorial-section {
    gap: 48px;
  }

  .study-stage {
    gap: 40px;
    padding: 32px;
  }

  .conversation {
    padding-inline: 20px;
  }

  .site-footer > p {
    display: none;
  }
}

@media (max-width: 680px) {
  .wrap {
    width: calc(100% - 40px);
  }

  .site-header nav,
  .site-footer nav {
    gap: 16px;
  }

  .hero,
  .editorial-section,
  .study-stage {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero {
    gap: 24px;
    padding-block: 56px 40px;
  }

  .hero h1 {
    max-width: 360px;
    margin-top: 20px;
  }

  .hero-intro {
    font-size: var(--theme-ui-fontSizes-2);
  }

  .study-stage {
    gap: 28px;
    padding: 28px 16px 16px;
  }

  .study-note {
    padding-inline: 8px;
  }

  .study-note h2 {
    max-width: none;
    margin-block: 12px;
  }

  .study-instruction {
    margin-top: 16px;
  }

  .conversation {
    padding: 20px 16px;
  }

  .place-card-heading {
    gap: 12px;
    padding: 16px;
  }

  .source-note summary {
    padding-inline: 16px;
  }

  .interface-study figcaption {
    flex-direction: column;
    gap: 2px;
  }

  .editorial-section {
    gap: 24px;
    padding-block: 44px;
  }

  .editorial-section h2 {
    max-width: none;
    font-size: 28px;
    margin-top: 12px;
  }

  .section-aside {
    max-width: none;
  }

  .site-footer {
    flex-wrap: wrap;
    gap: 20px;
  }

  .not-found {
    padding-block: 64px 80px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
}