:root {
  color-scheme: light dark;

  --bg: #ffffff;
  --surface: #f2f2f2;
  --text: #1c1c1c;
  --body: #3d3d3d;
  --border: rgba(28, 28, 28, 0.12);
  --btn-bg: #1c1c1c;
  --btn-fg: #ffffff;
  --bubble-user-bg: #1c1c1c;
  --bubble-user-fg: #ffffff;
  --focus: #2563eb;

  --blue: #2563eb;
  --blue-soft: #d8e9ff;
  --green: #15803d;
  --green-soft: #dcf5e3;
  --amber: #d9822b;
  --amber-soft: #fdecd3;
  --coral: #f2622a;
  --coral-soft: #fde3d6;
  --rose: #e11d63;
  --rose-soft: #fde0ea;
  --violet: #7c3aed;
  --violet-soft: #ebe3fd;
  --indigo: #4f46e5;
  --indigo-soft: #e0e2fd;

  --font-sans: "Geist", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --wrap: 64rem;
  --wrap-wide: 80rem;
  --wrap-narrow: 46rem;
  --radius: 1rem;
  --gap: 1rem;
  --section-y: 4rem;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161616;
    --surface: #1f1f1f;
    --text: #f5f5f5;
    --body: #c8c8c8;
    --border: rgba(245, 245, 245, 0.14);
    --btn-bg: #f5f5f5;
    --btn-fg: #1c1c1c;
    --bubble-user-bg: #f5f5f5;
    --bubble-user-fg: #1c1c1c;
    --focus: #8ab4ff;

    --blue: #8ab4ff;
    --blue-soft: rgba(37, 99, 235, 0.22);
    --green: #6ed39a;
    --green-soft: rgba(22, 163, 74, 0.22);
    --amber: #f0a65b;
    --amber-soft: rgba(217, 130, 43, 0.22);
    --coral: #ff8f66;
    --coral-soft: rgba(242, 98, 42, 0.22);
    --rose: #ff7aa6;
    --rose-soft: rgba(225, 29, 99, 0.22);
    --violet: #b89cff;
    --violet-soft: rgba(124, 58, 237, 0.24);
    --indigo: #a5a3ff;
    --indigo-soft: rgba(79, 70, 229, 0.24);
  }
}

@media (min-width: 48em) {
  :root {
    --section-y: 6rem;
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--body);
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.6;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  color: var(--text);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.25rem, 1.3rem + 4.5vw, 4rem);
  font-weight: 600;
}

h2 {
  font-size: clamp(1.75rem, 1.2rem + 2.2vw, 2.5rem);
  font-weight: 600;
}

h3 {
  font-size: 1.125rem;
  font-weight: 600;
}

p {
  margin: 0;
}

a {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 0.18em;
  text-decoration-thickness: 1px;
  transition: color 150ms var(--ease), background-color 150ms var(--ease), border-color 150ms var(--ease), opacity 150ms var(--ease);
}

a:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 0.25rem;
}

svg {
  display: block;
}

ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100%;
  z-index: 100;
  padding: 0.75rem 1rem;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border-radius: 0.5rem;
  text-decoration: none;
  font-weight: 600;
}

.skip-link:focus {
  top: 1rem;
}

.wrap,
.wrap-wide,
.wrap-narrow {
  width: 100%;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.wrap { max-width: var(--wrap); }
.wrap-wide { max-width: var(--wrap-wide); }
.wrap-narrow { max-width: var(--wrap-narrow); }

@media (min-width: 48em) {
  .wrap,
  .wrap-wide,
  .wrap-narrow {
    padding: 0 2rem;
  }
}

/* Buttons */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.2;
  text-decoration: none;
  text-align: center;
  white-space: nowrap;
  transition: background-color 150ms var(--ease), color 150ms var(--ease), border-color 150ms var(--ease), transform 150ms var(--ease);
}

.button:hover {
  text-decoration: none;
}

.button-primary {
  background: var(--btn-bg);
  color: var(--btn-fg);
  border-color: var(--btn-bg);
}

.button-primary:hover {
  opacity: 0.88;
}

.button-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.button-ghost:hover {
  background: var(--surface);
  border-color: var(--text);
}

.button-small {
  min-height: 2.75rem;
  padding: 0.5rem 1.125rem;
  font-size: 0.9375rem;
}

.button-invert {
  background: #ffffff;
  color: #1c1c1c;
  border-color: #ffffff;
}

.button-invert:hover {
  background: #f2f2f2;
  border-color: #f2f2f2;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem var(--gap);
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
}

.wordmark {
  margin-right: auto;
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.01em;
  color: var(--text);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 0.25rem 1.25rem;
  order: 3;
  width: 100%;
  font-size: 0.9375rem;
}

.nav-links a {
  display: inline-block;
  padding: 0.25rem 0;
  text-decoration: none;
  color: var(--body);
}

.nav-links a:hover {
  color: var(--text);
  text-decoration: underline;
}

@media (min-width: 48em) {
  .nav {
    padding-top: 1rem;
    padding-bottom: 1rem;
  }

  .nav-links {
    order: 0;
    width: auto;
    margin-right: 1rem;
  }
}

/* Hero */

.hero {
  padding: var(--section-y) 0 calc(var(--section-y) * 0.75);
  border-bottom: 1px solid var(--border);
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.eyebrow {
  margin-bottom: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--body);
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 999px;
}

.hero h1 {
  max-width: 18ch;
}

.lede {
  margin-top: 1.25rem;
  font-size: clamp(1.125rem, 1rem + 0.6vw, 1.375rem);
  max-width: 36rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 2rem;
  width: 100%;
}

@media (max-width: 30em) {
  .actions .button {
    width: 100%;
  }
}

/* Chat mockup */

.chat-mockup {
  width: 100%;
  max-width: 30rem;
  margin: 3rem 0 0;
  padding: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  text-align: left;
}

.bubble {
  max-width: 85%;
  padding: 0.75rem 1rem;
  border-radius: 1.125rem;
  font-size: 0.9375rem;
  line-height: 1.5;
}

.bubble-user {
  align-self: flex-end;
  background: var(--bubble-user-bg);
  color: var(--bubble-user-fg);
  border-bottom-right-radius: 0.375rem;
}

.bubble-row {
  display: flex;
  align-items: flex-end;
  gap: 0.625rem;
}

.avatar {
  flex: none;
  width: 2rem;
  height: 2rem;
}

.bubble-agent {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-bottom-left-radius: 0.375rem;
}

/* Sections */

.section {
  padding: var(--section-y) 0;
}

.section-alt {
  background: var(--surface);
}

@media (prefers-color-scheme: dark) {
  .section-alt {
    background: #1a1a1a;
  }
}

.section-head {
  max-width: 40rem;
  margin-bottom: 2.5rem;
}

.section-head p {
  margin-top: 0.875rem;
  font-size: 1.125rem;
}

/* Cards */

.card-grid {
  display: grid;
  gap: var(--gap);
  grid-template-columns: 1fr;
}

@media (min-width: 40em) {
  .card-grid.cols-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 64em) {
  .card-grid.cols-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 150ms var(--ease), transform 150ms var(--ease);
}

.section-alt .card {
  background: var(--bg);
}

.card:hover {
  border-color: var(--accent);
}

.card h3 {
  margin-top: 1.125rem;
}

.card p {
  margin-top: 0.5rem;
  font-size: 1rem;
}

.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 0.75rem;
  background: var(--accent-soft);
  color: var(--accent);
}

.icon svg {
  width: 1.375rem;
  height: 1.375rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.accent-blue { --accent: var(--blue); --accent-soft: var(--blue-soft); }
.accent-green { --accent: var(--green); --accent-soft: var(--green-soft); }
.accent-amber { --accent: var(--amber); --accent-soft: var(--amber-soft); }
.accent-coral { --accent: var(--coral); --accent-soft: var(--coral-soft); }
.accent-rose { --accent: var(--rose); --accent-soft: var(--rose-soft); }
.accent-violet { --accent: var(--violet); --accent-soft: var(--violet-soft); }
.accent-indigo { --accent: var(--indigo); --accent-soft: var(--indigo-soft); }

/* Channels */

.channel-row {
  display: flex;
  gap: var(--gap);
}

.channel {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 4.5rem;
  height: 4.5rem;
  border-radius: var(--radius);
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--border);
}

.channel svg {
  width: 2rem;
  height: 2rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Platforms */

.platform-list {
  display: grid;
  gap: var(--gap);
  grid-template-columns: 1fr;
}

@media (min-width: 40em) {
  .platform-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

.platform-list li {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.25rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.platform-list .icon {
  flex: none;
}

.platform-list p {
  margin-top: 0.25rem;
  font-size: 1rem;
}

/* Statements */

.two-up {
  display: grid;
  gap: 2.5rem;
  grid-template-columns: 1fr;
}

@media (min-width: 48em) {
  .two-up {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }
}

.statement h2 {
  margin-top: 1.25rem;
  font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2rem);
}

.statement p {
  margin-top: 0.875rem;
  font-size: 1.0625rem;
}

/* FAQ */

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.faq summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.125rem 1.25rem;
  cursor: pointer;
  list-style: none;
  color: var(--text);
  font-weight: 600;
  border-radius: var(--radius);
}

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

.faq summary::after {
  content: "";
  flex: none;
  width: 0.625rem;
  height: 0.625rem;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform 150ms var(--ease);
  margin-right: 0.25rem;
}

.faq[open] summary::after {
  transform: rotate(-135deg);
}

.faq p {
  padding: 0 1.25rem 1.25rem;
}

/* CTA band */

.cta-band {
  padding: 3rem 1.5rem;
  background: #1c1c1c;
  color: #d4d4d4;
  border-radius: var(--radius);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

@media (min-width: 48em) {
  .cta-band {
    padding: 4rem 3rem;
  }
}

.cta-band h2 {
  color: #ffffff;
}

.cta-band .lede {
  margin-top: 1rem;
}

.cta-contact {
  margin-top: 1.25rem;
  font-size: 1rem;
}

.cta-contact a {
  color: #ffffff;
}

.cta-band :focus-visible {
  outline-color: #8ab4ff;
}

@media (prefers-color-scheme: dark) {
  .cta-band {
    background: #1f1f1f;
    border: 1px solid var(--border);
  }
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0 2.5rem;
  font-size: 0.9375rem;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
}

@media (min-width: 48em) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: baseline;
  }
}

/* Reveal on scroll (only when the script runs and motion is allowed) */

html.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 500ms var(--ease), transform 500ms var(--ease);
}

html.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  html.js .reveal {
    opacity: 1;
    transform: none;
  }
}