/* Shared styles for every page. System fonts, no JavaScript, light and dark. */

:root {
  color-scheme: light dark;
  --bg: #f7f6f2;
  --bg-raised: #fdfcf9;
  --bg-sunk: #eeece5;
  --text: #16161a;
  --muted: #55555b;
  --rule: #dcd9d0;
  --rule-strong: #b4b0a5;
  --accent: #2a49a6;
  --on-text: #f7f6f2;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --wrap: 72rem;
  --measure: 40rem;
  --gutter: 16px;
  --radius: 4px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141413;
    --bg-raised: #1b1b19;
    --bg-sunk: #222220;
    --text: #ecebe6;
    --muted: #a8a69f;
    --rule: #33322e;
    --rule-strong: #57554e;
    --accent: #a3b6f2;
    --on-text: #141413;
  }
}

@media (min-width: 720px) {
  :root { --gutter: 32px; }
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 1rem/1.6 var(--font);
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
}

@media (min-width: 720px) {
  body { font-size: 1.0625rem; }
}

img, svg { max-width: 100%; height: auto; }

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}
a:hover { text-decoration-thickness: 2px; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

h1, h2, h3 {
  margin: 0 0 0.5em;
  font-weight: 650;
  line-height: 1.15;
  letter-spacing: -0.015em;
  text-wrap: balance;
}
h1 { font-size: clamp(2.25rem, 1.5rem + 3vw, 3.5rem); letter-spacing: -0.025em; line-height: 1.08; }
h2 { font-size: clamp(1.5rem, 1.2rem + 1.4vw, 2.25rem); }
h3 { font-size: 1.125rem; letter-spacing: -0.005em; }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

code, pre { font-family: var(--mono); }
code { font-size: 0.9em; }
p code, li code, dd code {
  background: var(--bg-sunk);
  border-radius: 3px;
  padding: 0.05em 0.3em;
}

/* Layout */

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

.measure { max-width: var(--measure); }

.skip {
  position: absolute;
  left: 8px;
  top: -100px;
  z-index: 10;
  padding: 8px 12px;
  border-radius: var(--radius);
  background: var(--text);
  color: var(--on-text);
}
.skip:focus { top: 8px; }

/* Header and footer */

.site-header { border-bottom: 1px solid var(--rule); }
.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 20px;
  min-height: 64px;
  padding-block: 12px;
}

.wordmark {
  color: var(--text);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
}
.nav a {
  color: var(--text);
  font-size: 0.9375rem;
  text-decoration: none;
}
.nav a:hover { text-decoration: underline; }
.nav a[aria-current="page"] {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.4em;
}
.nav a.button {
  min-height: 38px;
  padding: 7px 14px;
  color: var(--on-text);
  font-size: 0.9375rem;
}
.nav a.button:hover,
.nav a.button[aria-current="page"] { background: transparent; color: var(--text); text-decoration: none; }

@media (min-width: 720px) {
  .nav { gap: 8px 28px; }
}

.site-footer {
  border-top: 1px solid var(--rule);
  padding-block: 32px 40px;
  color: var(--muted);
  font-size: 0.875rem;
}
.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 32px;
}
.site-footer p { margin: 0; }
.site-footer strong { color: var(--text); }
.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--text); }

/* Buttons and links */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 20px;
  border: 1px solid var(--text);
  border-radius: var(--radius);
  background: var(--text);
  color: var(--on-text);
  font: inherit;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
}
.button:hover {
  background: transparent;
  color: var(--text);
}

.link-arrow {
  font-weight: 600;
  text-decoration: none;
}
.link-arrow:hover { text-decoration: underline; }

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 24px;
  margin-top: 28px;
}

/* Type helpers */

.eyebrow {
  margin: 0 0 16px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.01em;
}

.lede {
  max-width: var(--measure);
  color: var(--muted);
  font-size: 1.125rem;
  line-height: 1.55;
}
@media (min-width: 720px) {
  .lede { font-size: 1.25rem; }
}

.quiet { color: var(--muted); }
h1 .quiet { display: block; }

.statement {
  max-width: 24em;
  font-size: clamp(1.625rem, 1.2rem + 2vw, 2.625rem);
  letter-spacing: -0.02em;
}

.kicker {
  margin: 0 0 6px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.8125rem;
}

.small { font-size: 0.875rem; color: var(--muted); }

/* Sections */

.page-head { padding-block: 48px 40px; }
@media (min-width: 720px) {
  .page-head { padding-block: 88px 64px; }
}
.page-head h1 { max-width: 16em; }

.section {
  padding-block: 56px;
  border-top: 1px solid var(--rule);
}
@media (min-width: 720px) {
  .section { padding-block: 88px; }
}
.section-head { margin-bottom: 36px; }
.section-head h2 { max-width: 22em; }
@media (min-width: 720px) {
  .section-head { margin-bottom: 48px; }
}

/* Hero */

.hero { padding-block: 48px 56px; }
.hero-grid {
  display: grid;
  gap: 48px;
  align-items: start;
}
@media (min-width: 1000px) {
  .hero { padding-block: 96px 88px; }
  .hero-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 72px;
  }
}

/* Example: an agent answer with an ad line after it */

.example { margin: 0; }
.transcript {
  border: 1px solid var(--rule-strong);
  border-radius: 6px;
  background: var(--bg-raised);
  font-size: 0.9375rem;
  line-height: 1.55;
}
.t-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 2px 10px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.8125rem;
}
.t-head strong {
  color: var(--text);
  font-family: var(--mono);
  font-weight: 600;
}
.t-body { padding: 16px; }
.t-turn + .t-turn { margin-top: 16px; }
.t-who {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.75rem;
}
.t-turn p { margin-bottom: 10px; }
.t-turn p:last-child { margin-bottom: 0; }
.t-turn pre {
  margin: 0 0 10px;
  padding: 10px 12px;
  border-radius: var(--radius);
  background: var(--bg-sunk);
  font-size: 0.8125rem;
  line-height: 1.5;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.t-ad {
  padding: 12px 16px 14px;
  border-top: 1px dashed var(--rule-strong);
  color: var(--muted);
  font-size: 0.875rem;
}
.t-ad strong { color: var(--text); font-weight: 600; }
.t-link {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}
.example figcaption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 0.8125rem;
}

.ad-label {
  display: inline-block;
  margin-right: 6px;
  padding: 0 5px;
  border: 1px solid currentColor;
  border-radius: 3px;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.5;
  vertical-align: 1px;
}

.badge {
  display: inline-block;
  padding: 1px 10px;
  border: 1px solid currentColor;
  border-radius: 999px;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1.6;
  white-space: nowrap;
}

/* Grids and items */

.grid-2, .grid-3 { display: grid; gap: 48px; }
@media (min-width: 820px) {
  .grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 56px; }
}
@media (min-width: 960px) {
  .grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 40px; }
}

.item {
  padding-top: 20px;
  border-top: 2px solid var(--text);
}
.item h3 { font-size: 1.375rem; }
.item > .link-arrow { display: inline-block; margin-top: 8px; }

.specimen {
  margin: 20px 0;
  padding: 14px 16px;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--bg-raised);
  color: var(--muted);
  font-size: 0.875rem;
  line-height: 1.6;
}
.specimen strong { color: var(--text); font-weight: 600; }
.specimen-card {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
}
.specimen-card .agent-name {
  color: var(--text);
  font-family: var(--mono);
  font-weight: 600;
}

.facts { margin: 0; font-size: 0.9375rem; }
.facts div {
  display: grid;
  grid-template-columns: 7rem minmax(0, 1fr);
  gap: 12px;
  padding: 10px 0;
  border-top: 1px solid var(--rule);
}
.facts dt { color: var(--muted); }
.facts dd { margin: 0; }

.dash {
  margin: 0 0 1em;
  padding: 0;
  list-style: none;
}
.dash li {
  position: relative;
  margin-bottom: 0.55em;
  padding-left: 1.25em;
}
.dash li::before {
  content: "\2013";
  position: absolute;
  left: 0;
  color: var(--muted);
}
.dash:last-child { margin-bottom: 0; }

.rules {
  display: grid;
  gap: 16px 48px;
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
}
@media (min-width: 900px) {
  .rules { grid-template-columns: 15rem minmax(0, 1fr); }
  .rules .dash { columns: 2; column-gap: 48px; }
  .rules .dash li { break-inside: avoid; }
}

/* Numbered points (home page summary) */

.points {
  display: grid;
  margin: 0 0 40px;
  padding: 0;
  list-style: none;
}
@media (min-width: 720px) {
  .points { grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 40px; }
}
@media (min-width: 1040px) {
  .points { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
.points li {
  padding: 20px 0 24px;
  border-top: 1px solid var(--rule);
}
.points h3 { margin-bottom: 6px; }
.points p { color: var(--muted); }
.num {
  display: block;
  margin-bottom: 8px;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.8125rem;
}

/* Principles (trust page) */

.principles {
  margin: 0;
  padding: 0;
  list-style: none;
}
.principle {
  display: grid;
  gap: 8px 48px;
  padding-block: 32px;
  border-top: 1px solid var(--rule);
}
.principle:first-child { border-top: 0; padding-top: 0; }
@media (min-width: 900px) {
  .principle {
    grid-template-columns: 19rem minmax(0, 1fr);
    padding-block: 44px;
  }
}
.principle h2 { font-size: 1.375rem; letter-spacing: -0.01em; }
.principle .body { max-width: var(--measure); }
.stops {
  color: var(--muted);
  font-size: 0.9375rem;
}
.stops strong { color: var(--text); font-weight: 600; }

/* Guides */

.prose h2 { margin-top: 2em; font-size: 1.5rem; }
.prose h2:first-child { margin-top: 0; }
.prose .steps, .prose .keys, .prose .code, .prose .dash { margin-block: 1.25em; }

/* Two columns with a narrow label column */

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px 64px;
}
@media (min-width: 960px) {
  .split { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .split-wide { grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); }
}

/* Code blocks: receipts, policy files, markup */

.code {
  margin: 0;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--bg-raised);
  min-width: 0;
}
.code + .code { margin-top: 20px; }
.code-head {
  padding: 8px 14px;
  border-bottom: 1px solid var(--rule);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.75rem;
  overflow-wrap: anywhere;
}
.code pre {
  margin: 0;
  padding: 14px;
  overflow-x: auto;
  font-size: 0.8125rem;
  line-height: 1.6;
  tab-size: 2;
}
@media (max-width: 420px) {
  .code pre { font-size: 0.75rem; padding: 12px; }
}
.code .c { color: var(--muted); }

/* Steps */

.steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}
.steps li {
  position: relative;
  padding: 16px 0 18px 44px;
  border-top: 1px solid var(--rule);
  counter-increment: step;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 15px;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border: 1px solid var(--rule-strong);
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 0.8125rem;
}
.steps h3 { margin-bottom: 4px; font-size: 1.0625rem; }
.steps p { color: var(--muted); }

/* Policy keys */

.keys { margin: 0; }
.keys div {
  display: grid;
  gap: 2px 24px;
  padding: 14px 0;
  border-top: 1px solid var(--rule);
}
@media (min-width: 720px) {
  .keys div { grid-template-columns: 17rem minmax(0, 1fr); }
}
/* Beside code the column is too narrow for a side-by-side key and value. */
.split .keys div { grid-template-columns: minmax(0, 1fr); }
.keys dt {
  font-family: var(--mono);
  font-size: 0.875rem;
  font-weight: 600;
  overflow-wrap: anywhere;
}
.keys dd { margin: 0; color: var(--muted); }

/* A single strong statement between rules */

.notice {
  display: grid;
  gap: 12px 64px;
  padding-block: 32px;
  border-block: 2px solid var(--text);
}
@media (min-width: 900px) {
  .notice { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: start; }
}
.notice h2 { margin: 0; }

/* Call to action band */

.cta {
  padding-block: 64px;
  border-top: 1px solid var(--rule);
}
@media (min-width: 720px) {
  .cta { padding-block: 96px; }
}
.cta-inner {
  display: grid;
  gap: 28px;
}
@media (min-width: 820px) {
  .cta-inner { grid-template-columns: minmax(0, 1fr) auto; align-items: end; gap: 48px; }
}
.cta h2 { margin-bottom: 12px; }
.button-lg { min-height: 52px; padding: 14px 28px; font-size: 1.0625rem; }

/* Contact form */

.contact-grid {
  display: grid;
  gap: 48px;
}
@media (min-width: 960px) {
  .contact-grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1fr);
    gap: 80px;
  }
}

.form { display: grid; gap: 22px; }
.field label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.9375rem;
  font-weight: 600;
}
.field .opt { color: var(--muted); font-weight: 400; }
.field input,
.field select,
.field textarea {
  display: block;
  width: 100%;
  min-height: 46px;
  padding: 10px 12px;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius);
  background: var(--bg-raised);
  color: var(--text);
  font: inherit;
  font-size: 1rem;
}
.field textarea {
  min-height: 150px;
  line-height: 1.5;
  resize: vertical;
}
.field input:focus-visible,
.field select:focus-visible,
.field textarea:focus-visible {
  border-color: var(--accent);
  outline: 2px solid var(--accent);
  outline-offset: 0;
}
.field-row { display: grid; gap: 22px; }
@media (min-width: 560px) {
  .field-row { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
}
.form .button { justify-self: start; min-width: 10rem; }

/* Honeypot: off screen for people, still in the HTML for bots. */
.hp {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.panel {
  padding: 24px;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--bg-raised);
}
.panel h2 { font-size: 1.125rem; }