:root {
  --canvas: #f5f5f7;
  --surface: #ffffff;
  --ink: #1d1d1f;
  --secondary: #424245;
  --muted: #6e6e73;
  --line: #d2d2d7;
  --line-soft: rgba(60, 60, 67, 0.12);
  --blue: #0071e3;
  --blue-hover: #0077ed;
  --blue-soft: #eef6ff;
  --focus: 0 0 0 4px rgba(0, 113, 227, 0.22);
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.1);
  --display: ui-rounded, "SF Pro Rounded", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --body: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  color-scheme: light;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  touch-action: manipulation;
  -webkit-tap-highlight-color: rgba(0, 113, 227, 0.14);
}

button,
a { font: inherit; }

[id] { scroll-margin-top: 1.5rem; }
h1, h2, h3 { text-wrap: balance; }
p { text-wrap: pretty; }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.7rem 1rem;
  border-radius: 0.7rem;
  background: var(--ink);
  color: #fff;
  transform: translateY(-160%);
}

.skip-link:focus { transform: translateY(0); }

.site-header,
.hero,
.possibilities,
.how,
.footer {
  width: min(calc(100% - 2rem), 74rem);
  margin-inline: auto;
}

.site-header {
  display: flex;
  min-height: 4.75rem;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.68rem;
  color: var(--ink);
  font-family: var(--display);
  font-size: 1.18rem;
  font-weight: 700;
  letter-spacing: -0.035em;
  text-decoration: none;
}

.brand-mark,
.avatar {
  display: inline-flex;
  align-items: flex-end;
  justify-content: center;
  gap: 2px;
  border-radius: 10px;
  background: var(--ink);
}

.brand-mark { width: 2rem; height: 2rem; padding: 7px; }
.brand-mark i,
.avatar i { display: block; width: 3px; border-radius: 3px; background: #fff; }
.brand-mark i:nth-child(1), .avatar i:nth-child(1) { height: 7px; }
.brand-mark i:nth-child(2), .avatar i:nth-child(2) { height: 13px; }
.brand-mark i:nth-child(3), .avatar i:nth-child(3) { height: 9px; }

.header-actions,
.hero-actions,
.how-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.header-link {
  color: var(--secondary);
  font-size: 0.9rem;
  font-weight: 550;
  text-decoration: none;
}

.header-link:hover { color: var(--blue); }

.button {
  display: inline-flex;
  min-height: 3.25rem;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 0.78rem 1.1rem;
  border: 1px solid transparent;
  border-radius: 0.82rem;
  font-size: 0.93rem;
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  transition: background-color 140ms ease, border-color 140ms ease, color 140ms ease, transform 140ms ease;
}

.button:hover { transform: translateY(-1px); }
.button-compact { min-height: 2.45rem; padding: 0.55rem 0.9rem; border-radius: 1.25rem; font-size: 0.84rem; }
.button-primary { background: var(--blue); color: #fff; }
.button-primary:hover { background: var(--blue-hover); }
.button-secondary { border-color: var(--line); background: var(--surface); color: var(--ink); }
.button-secondary:hover { border-color: #aeb1b7; background: #fafafa; }
.button-light { background: #fff; color: var(--ink); }
.button-light:hover { background: #f5f5f7; }
.button-arrow { font-size: 1rem; }

.hero {
  display: grid;
  gap: 3rem;
  padding: clamp(4.5rem, 10vw, 8rem) 0 clamp(6rem, 12vw, 9.5rem);
}

.hero-copy { align-self: center; }

.eyebrow {
  margin: 0 0 0.9rem;
  color: var(--blue);
  font-size: 0.76rem;
  font-weight: 650;
  letter-spacing: 0.045em;
  line-height: 1.4;
  text-transform: uppercase;
}

h1, h2, h3 {
  margin-top: 0;
  font-family: var(--display);
  font-weight: 680;
  letter-spacing: -0.045em;
}

h1 {
  max-width: 46rem;
  margin-bottom: 1.5rem;
  font-size: clamp(3.05rem, 7.2vw, 4.9rem);
  line-height: 0.98;
}

h1 span { color: var(--blue); }

.hero-lead {
  max-width: 39rem;
  margin: 0 0 1.8rem;
  color: var(--secondary);
  font-size: clamp(1.08rem, 2.4vw, 1.3rem);
  line-height: 1.52;
}

.cta-note { margin: 0.8rem 0 0; color: var(--muted); font-size: 0.8rem; }

.conversation {
  position: relative;
  width: min(100%, 30rem);
  justify-self: center;
  overflow: hidden;
  border: 1px solid rgba(60, 60, 67, 0.18);
  border-radius: 1.7rem;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.conversation-top {
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 0.72rem;
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--line-soft);
  background: rgba(250, 250, 252, 0.92);
}

.avatar { width: 2.35rem; height: 2.35rem; flex: 0 0 auto; padding: 8px; }
.conversation-top > span:nth-child(2) { display: grid; min-width: 0; line-height: 1.25; }
.conversation-top strong { font-size: 0.86rem; }
.conversation-top small { margin-top: 0.1rem; color: var(--muted); font-size: 0.68rem; }
.window-controls { display: flex; margin-left: auto; gap: 5px; }
.window-controls i { display: block; width: 7px; height: 7px; border-radius: 50%; background: #c7c7cc; }

.messages {
  display: flex;
  min-height: 24rem;
  flex-direction: column;
  justify-content: center;
  gap: 0.75rem;
  padding: 1.4rem 1rem;
  background: #fbfbfd;
}

.message {
  max-width: 88%;
  margin: 0;
  padding: 0.85rem 0.95rem;
  border-radius: 1.05rem;
  font-size: 0.87rem;
  line-height: 1.5;
}

.message-user { align-self: flex-end; border-bottom-right-radius: 0.3rem; background: #e9e9eb; color: var(--ink); }
.message-ai { align-self: flex-start; padding-left: 0; background: transparent; }
.message-ai p { margin: 0; }

.document-chip {
  display: flex;
  align-self: flex-end;
  align-items: center;
  gap: 0.65rem;
  max-width: 88%;
  padding: 0.62rem 0.78rem;
  border: 1px solid var(--line-soft);
  border-radius: 0.85rem;
  background: #fff;
}

.document-chip > span:first-child { padding: 0.4rem; border-radius: 0.38rem; background: #fff0ef; color: #b42318; font-size: 0.58rem; font-weight: 700; }
.document-chip > span:last-child { display: grid; min-width: 0; line-height: 1.2; }
.document-chip strong { font-size: 0.76rem; }
.document-chip small { margin-top: 0.15rem; color: var(--muted); font-size: 0.64rem; }

.prompt-bar {
  display: flex;
  min-width: 0;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem;
  margin: 0.8rem;
  padding: 0.58rem 0.62rem 0.58rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  color: #98989d;
  font-size: 0.76rem;
}

.prompt-bar > span:first-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.send { display: grid; width: 1.9rem; height: 1.9rem; flex: 0 0 auto; place-items: center; border-radius: 0.6rem; background: var(--blue); color: #fff; }

.possibilities { padding: 0 0 clamp(6rem, 12vw, 9rem); }
.section-heading { max-width: 54rem; margin-bottom: 2.5rem; }
.section-heading h2,
.how h2,
.final-cta h2 { margin-bottom: 1.25rem; font-size: clamp(2.35rem, 6vw, 4.7rem); line-height: 1.01; }
.section-heading > p:last-child { max-width: 43rem; margin: 0; color: var(--muted); font-size: 1.02rem; }

.capability-list {
  display: grid;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: 1.45rem;
  background: var(--surface);
}

.capability {
  display: grid;
  min-width: 0;
  gap: 1.15rem;
  padding: 1.55rem;
  border-bottom: 1px solid var(--line-soft);
}

.capability:last-child { border-bottom: 0; }
.capability-index { color: var(--blue); font-size: 0.75rem; font-variant-numeric: tabular-nums; font-weight: 650; }
.capability h3 { margin-bottom: 0.5rem; font-size: 1.3rem; line-height: 1.1; }
.capability p { margin: 0; color: var(--muted); font-size: 0.9rem; }

.how {
  display: grid;
  gap: 1.5rem;
  padding: clamp(2.5rem, 6vw, 5rem);
  border-radius: 1.8rem;
  background: var(--ink);
  color: #fff;
}

.how .eyebrow { color: #6cb6ff; }
.how h2 { margin: 0; }
.how > p { max-width: 38rem; margin: 0; color: #c7c7cc; font-size: 1.02rem; }
.how .text-link { color: #fff; }

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--blue);
  font-weight: 600;
  text-decoration: none;
}

.text-link:hover { text-decoration: underline; text-underline-offset: 0.22em; }

.final-cta {
  width: min(calc(100% - 2rem), 74rem);
  margin: 1rem auto 0;
  padding: clamp(4rem, 9vw, 7rem) 1.5rem;
  text-align: center;
}

.final-cta h2 { margin-inline: auto; }
.final-cta > p:not(.eyebrow) { max-width: 39rem; margin: 0 auto 1.7rem; color: var(--muted); }
.final-cta .button-light { border-color: var(--line); }

.footer {
  display: grid;
  gap: 0.9rem;
  padding: 2.5rem 0 7rem;
  border-top: 1px solid var(--line-soft);
  color: var(--muted);
  font-size: 0.82rem;
}

.footer p { margin: 0; }
.footer nav { display: flex; flex-wrap: wrap; gap: 0.7rem 1.15rem; }
.footer nav a { text-underline-offset: 0.2em; }
.footer-brand { color: var(--ink); }

.mobile-dock {
  position: fixed;
  z-index: 30;
  right: 0;
  bottom: 0;
  left: 0;
  padding: 0.65rem max(1rem, env(safe-area-inset-right)) max(0.65rem, env(safe-area-inset-bottom)) max(1rem, env(safe-area-inset-left));
  background: rgba(245, 245, 247, 0.93);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
}

.mobile-dock .button { width: 100%; }

.privacy-main { width: min(calc(100% - 2rem), 48rem); margin: 3rem auto 5rem; }
.privacy-main > h1 { max-width: 44rem; font-size: clamp(2.65rem, 9vw, 5.2rem); }
.privacy-lead { margin: 0 0 3rem; color: var(--secondary); font-size: clamp(1.05rem, 3vw, 1.3rem); }
.privacy-main section { padding: 1.5rem 0; border-top: 1px solid var(--line); }
.privacy-main section h2 { margin-bottom: 0.8rem; font-size: 1.55rem; line-height: 1.1; }
.privacy-main section p { color: var(--secondary); }
.privacy-main section p:last-child { margin-bottom: 0; }
.privacy-main code { padding: 0.12rem 0.3rem; border-radius: 0.28rem; background: #e8e8ed; font-size: 0.85em; }
.privacy-main a { text-underline-offset: 0.2em; }
.privacy-action { display: flex; flex-wrap: wrap; align-items: center; gap: 1.2rem; padding-top: 2rem; }
.privacy-footer { padding-bottom: 3rem; }

a:focus-visible,
button:focus-visible { outline: 0; box-shadow: var(--focus); }

@media (min-width: 44rem) {
  .site-header, .hero, .possibilities, .footer { width: min(calc(100% - 4rem), 74rem); }
  .hero { grid-template-columns: minmax(0, 1fr) minmax(21rem, 0.78fr); align-items: center; }
  .conversation { justify-self: end; }
  .capability-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .capability { border-right: 1px solid var(--line-soft); border-bottom: 0; }
  .capability:last-child { border-right: 0; }
  .how { width: min(calc(100% - 4rem), 74rem); grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.75fr); align-items: end; }
  .how-actions { grid-column: 1 / -1; }
  .final-cta { width: min(calc(100% - 4rem), 74rem); }
  .footer { grid-template-columns: auto 1fr auto; align-items: center; padding-bottom: 2.5rem; }
  .footer p { text-align: center; }
  .mobile-dock { display: none; }
}

@media (max-width: 43.99rem) {
  .site-header { padding-top: env(safe-area-inset-top); }
  .header-actions .header-link { display: none; }
  .hero { padding-top: 4rem; }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .hero-actions .button { width: 100%; justify-content: space-between; }
  .how-actions { align-items: flex-start; flex-direction: column; }
  .footer { padding-bottom: 7.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (prefers-contrast: more) {
  :root { --line: #6e6e73; --line-soft: rgba(29, 29, 31, 0.46); --muted: #424245; }
}