:root {
  --bg: #f7f8fa;
  --paper: #ffffff;
  --ink: #0e0f12;
  --mute: #5c6370;
  --faint: #8b919c;
  --line: #e7e9ee;
  --line-strong: #d5d9e0;
  --fill: #f1f2f5;
  --blue: #2f5bff;
  --shadow: 0 1px 1px rgba(14, 15, 18, 0.04), 0 28px 70px rgba(14, 15, 18, 0.10);
  --shadow-lg: 0 1px 1px rgba(14, 15, 18, 0.05), 0 40px 90px rgba(14, 15, 18, 0.14);
  --radius: 18px;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(920px 480px at 88% -80px, rgba(47, 91, 255, 0.10), transparent 62%),
    radial-gradient(640px 360px at 8% 0%, rgba(14, 15, 18, 0.035), transparent 55%),
    var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img, svg { max-width: 100%; display: block; }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88em;
  background: var(--fill);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.08em 0.35em;
}
.wrap { width: min(1160px, calc(100% - 48px)); margin: 0 auto; }
.wrap-s { width: min(720px, calc(100% - 40px)); margin: 0 auto; }

.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: saturate(180%) blur(18px);
  background: rgba(247, 248, 250, 0.78);
  border-bottom: 1px solid transparent;
}
.nav.scrolled,
.nav {
  border-bottom-color: rgba(231, 233, 238, 0.9);
}
.nav-inner {
  width: min(1160px, calc(100% - 48px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 64px;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-weight: 650;
  letter-spacing: -0.045em;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--ink);
}
.mark {
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: var(--ink);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0;
  line-height: 1;
}
.nav-links {
  display: flex;
  gap: 24px;
  flex: 1;
}
.nav-links a {
  text-decoration: none;
  color: var(--mute);
  font-size: 0.9rem;
  font-weight: 500;
}
.nav-links a:hover { color: var(--ink); }
.nav-end {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-left: auto;
}
.lang {
  color: var(--mute);
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.lang:hover { color: var(--ink); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--ink);
  color: #fff;
  text-decoration: none;
  padding: 11px 16px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.93rem;
  letter-spacing: -0.02em;
  border: 1px solid var(--ink);
  transition: transform 0.12s ease, background 0.12s ease, box-shadow 0.12s ease;
}
.btn:hover { background: #2a2c33; }
.btn-ghost {
  background: var(--paper);
  color: var(--ink);
  border-color: var(--line-strong);
}
.btn-ghost:hover { background: var(--fill); }
.btn-sm { padding: 8px 12px; font-size: 0.84rem; }

.hero {
  padding: 72px 0 24px;
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  gap: 48px;
  align-items: center;
}
.hero-copy .eyebrow { margin-bottom: 20px; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.8);
  color: var(--mute);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}
.dot-live {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #19c37d;
  box-shadow: 0 0 0 3px rgba(25, 195, 125, 0.16);
}
.hero h1,
.page h1 {
  margin: 0 0 16px;
  font-weight: 600;
  letter-spacing: -0.052em;
  line-height: 1.04;
}
.hero h1 {
  max-width: 13em;
  font-size: clamp(2.35rem, 4.2vw, 3.25rem);
  text-wrap: balance;
}
.lede {
  margin: 0;
  max-width: 36rem;
  color: var(--mute);
  font-size: 1.12rem;
  line-height: 1.55;
}
.cta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 28px;
}
.hint {
  margin-top: 14px;
  color: var(--faint);
  font-size: 0.86rem;
}

.device-wrap { position: relative; }
.device-wrap::before {
  content: "";
  position: absolute;
  inset: 8% -18% auto;
  height: 78%;
  background: radial-gradient(closest-side, rgba(47, 91, 255, 0.22), transparent);
  filter: blur(8px);
  z-index: 0;
  pointer-events: none;
}
.preview,
.device {
  position: relative;
  z-index: 1;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}
.preview { max-width: 520px; margin: 0 auto; }
.tg-head,
.preview-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(#fff, #fafbfc);
}
.avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}
.tg-meta { display: flex; flex-direction: column; gap: 1px; min-width: 0; }
.tg-meta strong { font-size: 0.86rem; letter-spacing: -0.03em; }
.tg-meta span { font-size: 0.72rem; color: var(--faint); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: #d6dae2; }
.preview-title { margin-left: 6px; font-size: 0.82rem; font-weight: 600; color: var(--mute); }
.chat { padding: 16px 14px 18px; display: grid; gap: 9px; background: #f4f6f8; }
.bubble {
  max-width: 88%;
  padding: 10px 12px;
  border-radius: 16px;
  font-size: 0.92rem;
  line-height: 1.42;
}
.bubble p { margin: 0; }
.me {
  justify-self: end;
  background: var(--ink);
  color: #fff;
  border-bottom-right-radius: 5px;
}
.bot {
  justify-self: start;
  background: #fff;
  border: 1px solid var(--line);
  border-bottom-left-radius: 5px;
}
.status {
  justify-self: start;
  color: var(--faint);
  font-size: 0.78rem;
  padding-left: 4px;
}
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}
.chip {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: var(--paper);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
}
.chip.on {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}

.logos {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 22px;
  flex-wrap: wrap;
  padding: 48px 0 56px;
  color: var(--faint);
  font-size: 0.84rem;
}
.logos b,
.brand {
  color: var(--ink);
  font-weight: 650;
  letter-spacing: -0.03em;
  font-size: 0.95rem;
}

.proof {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  margin-bottom: 72px;
}
.proof div {
  background: var(--paper);
  padding: 22px 24px;
}
.proof strong {
  display: block;
  margin-bottom: 4px;
  letter-spacing: -0.03em;
  font-size: 0.95rem;
}
.proof p { margin: 0; color: var(--mute); font-size: 0.9rem; }

.section { padding: 0 0 88px; }
.section h2,
.close h2 {
  margin: 0 0 10px;
  font-size: clamp(1.55rem, 3vw, 2.15rem);
  letter-spacing: -0.042em;
  font-weight: 600;
}
.section .sub {
  margin: 0 0 28px;
  color: var(--mute);
  max-width: 36rem;
}

.bento {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.tile {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 22px 22px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}
.tile:hover {
  border-color: var(--line-strong);
  box-shadow: 0 10px 30px rgba(14, 15, 18, 0.06);
  transform: translateY(-1px);
}
.tile-lg { grid-column: span 2; }
.kicker {
  margin: 0 0 10px;
  color: var(--faint);
  font-size: 0.75rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.tile h3 {
  margin: 0 0 8px;
  font-size: 1.12rem;
  letter-spacing: -0.035em;
  font-weight: 600;
}
.tile p { margin: 0; color: var(--mute); font-size: 0.95rem; }
.inbox {
  margin-top: 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  background: #fafbfc;
}
.inbox-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) auto;
  gap: 10px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  font-size: 0.84rem;
  align-items: baseline;
}
.inbox-row:last-child { border-bottom: 0; }
.inbox-row b { letter-spacing: -0.02em; }
.inbox-row span { color: var(--mute); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.inbox-row em { color: var(--faint); font-style: normal; font-size: 0.75rem; }

.path {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.step {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px 20px;
  counter-increment: step;
}
.path { counter-reset: step; }
.step::before {
  content: counter(step);
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  margin-bottom: 14px;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 650;
}
.step strong { display: block; margin-bottom: 6px; letter-spacing: -0.03em; }
.step p { margin: 0; color: var(--mute); }

.close {
  text-align: center;
  padding: 64px 28px;
  margin-bottom: 28px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
}
.close p { margin: 0 auto 24px; max-width: 32rem; color: var(--mute); }

.page { padding: 56px 0 88px; }
.page h1 {
  font-size: clamp(2rem, 5vw, 3.1rem);
}
.prose { max-width: 40rem; }
.prose h1 { margin-bottom: 16px; }
.prose h2 {
  margin: 32px 0 10px;
  font-size: 1.12rem;
  letter-spacing: -0.03em;
}
.prose p, .prose li { color: var(--mute); }
.prose ul { padding-left: 1.15rem; }
.prose a { color: var(--ink); text-underline-offset: 3px; }

.feat-list { display: grid; gap: 0; border-top: 1px solid var(--line); }
.feat {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}
.feat h3 { margin: 0; font-size: 1rem; letter-spacing: -0.02em; }
.feat p { margin: 0; color: var(--mute); }

.howto-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.howto-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 20px;
  overflow: hidden;
}
.howto-card .preview,
.howto-card .device {
  border: 0;
  border-radius: 0;
  box-shadow: none;
  max-width: none;
}
.howto-card .chat { min-height: 228px; }
.howto-card figcaption {
  padding: 14px 16px 16px;
  color: var(--mute);
  font-size: 0.9rem;
  border-top: 1px solid var(--line);
  background: var(--paper);
}

.foot {
  border-top: 1px solid var(--line);
  padding: 22px 0 40px;
  color: var(--faint);
  font-size: 0.86rem;
}
.foot-inner {
  width: min(1160px, calc(100% - 48px));
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.foot a { color: var(--mute); text-decoration: none; }
.foot a:hover { color: var(--ink); }

@media (max-width: 960px) {
  .hero-grid,
  .bento,
  .proof,
  .path,
  .howto-grid { grid-template-columns: 1fr; }
  .tile-lg { grid-column: auto; }
  .nav-links { display: none; }
  .hero { padding-top: 36px; }
  .hero h1 { max-width: none; }
  .device { max-width: 420px; }
  .feat { grid-template-columns: 1fr; gap: 6px; }
  .wrap, .nav-inner, .foot-inner { width: min(1160px, calc(100% - 32px)); }
}