:root {
  --brand: #4f46e5;
  --brand-2: #0ea5a4;
  --ink: #0f172a;
  --ink-2: #475569;
  --line: #e2e8f0;
  --bg: #ffffff;
  --bg-alt: #f6f7fb;
  --card: #ffffff;
  --radius: 14px;
  --shadow: 0 1px 2px rgb(15 23 42 / 0.04), 0 8px 24px rgb(15 23 42 / 0.06);
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand: #818cf8;
    --brand-2: #2dd4bf;
    --ink: #e5e7eb;
    --ink-2: #9ca3af;
    --line: #1f2937;
    --bg: #0b0f19;
    --bg-alt: #111827;
    --card: #131a2a;
    --shadow: 0 1px 2px rgb(0 0 0 / 0.3), 0 8px 24px rgb(0 0 0 / 0.3);
  }
}

* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}
body {
  margin: 0;
  font:
    16px/1.6 ui-sans-serif,
    system-ui,
    -apple-system,
    'Segoe UI',
    Roboto,
    'Helvetica Neue',
    Arial,
    sans-serif;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
a {
  color: inherit;
}
h1,
h2,
h3 {
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 0.5em;
}
h1 {
  font-size: clamp(2.1rem, 4.6vw, 3.4rem);
}
h2 {
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  text-align: center;
}
h3 {
  font-size: 1.1rem;
}
p {
  margin: 0 0 1em;
}
.wrap {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 16px;
}
.center {
  text-align: center;
}
.muted {
  color: var(--ink-2);
}
.sub {
  color: var(--ink-2);
  text-align: center;
  max-width: 720px;
  margin: 0 auto 2.5rem;
  font-size: 1.08rem;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.8em 1.3em;
  border-radius: 10px;
  background: var(--brand);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  transition:
    transform 0.15s,
    box-shadow 0.15s;
}
.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}
.btn-sm {
  padding: 0.5em 0.9em;
  font-size: 0.92rem;
}
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}
.btn-light {
  background: #fff;
  color: #312e81;
}

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-in {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 64px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 1.2rem;
  text-decoration: none;
}
.links {
  display: flex;
  gap: 22px;
  margin-left: 12px;
}
.links a {
  text-decoration: none;
  color: var(--ink-2);
  font-size: 0.95rem;
}
.links a:hover {
  color: var(--ink);
}
.nav-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 12px;
}
.lang {
  display: flex;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}
.lang button {
  border: 0;
  background: transparent;
  color: var(--ink-2);
  padding: 4px 9px;
  font: inherit;
  font-size: 0.82rem;
  cursor: pointer;
}
.lang button[aria-pressed='true'] {
  background: var(--bg-alt);
  color: var(--ink);
  font-weight: 700;
}

/* Hero */
.hero {
  padding: 72px 0 48px;
  background:
    radial-gradient(
      900px 400px at 85% 0%,
      color-mix(in srgb, var(--brand) 14%, transparent),
      transparent
    ),
    radial-gradient(
      700px 400px at 0% 100%,
      color-mix(in srgb, var(--brand-2) 10%, transparent),
      transparent
    );
}
.hero-in {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 48px;
  align-items: center;
}
.eyebrow {
  color: var(--brand);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.lead {
  font-size: 1.15rem;
  color: var(--ink-2);
  max-width: 560px;
}
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 24px;
}
.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  list-style: none;
  padding: 0;
  margin: 0;
  color: var(--ink-2);
  font-size: 0.92rem;
}
.hero-facts li::before {
  content: '✓ ';
  color: var(--brand-2);
  font-weight: 700;
}

/* Mock */
.mock {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  font-size: 0.9rem;
}
.mock-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--bg-alt);
}
.mock-bar i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--line);
}
.mock-bar span {
  margin-left: 10px;
  color: var(--ink-2);
  font-size: 0.8rem;
}
.mock-body {
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.mock-head {
  display: flex;
  align-items: center;
  gap: 10px;
}
.tag {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 999px;
}
.tag-wa {
  background: #dcfce7;
  color: #166534;
}
.tid {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-weight: 700;
}
.sla {
  margin-left: auto;
  font-size: 0.78rem;
  color: #b45309;
  background: #fef3c7;
  padding: 2px 8px;
  border-radius: 6px;
}
.msg {
  padding: 10px 12px;
  border-radius: 12px;
  max-width: 88%;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.msg b {
  font-size: 0.78rem;
  color: var(--ink-2);
}
.msg em {
  font-style: normal;
  font-size: 0.68rem;
  background: var(--brand);
  color: #fff;
  border-radius: 4px;
  padding: 0 5px;
  margin-left: 4px;
}
.msg.in {
  background: var(--bg-alt);
  align-self: flex-start;
}
.msg.ai {
  background: color-mix(in srgb, var(--brand) 12%, var(--card));
  align-self: flex-end;
}
.handoff {
  border: 1px dashed var(--brand-2);
  border-radius: 12px;
  padding: 12px;
  background: color-mix(in srgb, var(--brand-2) 7%, var(--card));
}
.handoff-t {
  font-weight: 700;
  color: var(--brand-2);
  font-size: 0.85rem;
}
.handoff-d {
  color: var(--ink-2);
  font-size: 0.85rem;
  margin: 4px 0 8px;
}
.chips {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.chips span {
  font-size: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 2px 10px;
  background: var(--card);
}

/* Channels */
.channels {
  padding: 28px 0 8px;
}
.ch-list {
  list-style: none;
  padding: 0;
  margin: 12px 0 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}
.ch-list li {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 16px;
  font-weight: 600;
  font-size: 0.92rem;
  background: var(--card);
}

/* Sections */
.section {
  padding: 88px 0;
}
.section.alt {
  background: var(--bg-alt);
}
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}
.card p {
  color: var(--ink-2);
  margin: 0;
  font-size: 0.96rem;
}
.card.flat {
  background: transparent;
}

/* AI */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.ticks {
  list-style: none;
  padding: 0;
  margin: 0 0 28px;
}
.ticks li {
  padding: 6px 0 6px 28px;
  position: relative;
  color: var(--ink-2);
}
.ticks li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 12px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--brand-2) 22%, transparent);
  box-shadow: inset 0 0 0 5px var(--brand-2);
}
.split p {
  color: var(--ink-2);
}
.levels {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.lvl {
  display: flex;
  gap: 14px;
  align-items: center;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 16px;
}
.lvl > span {
  font-family: ui-monospace, monospace;
  font-weight: 800;
  color: var(--brand);
  width: 32px;
}
.lvl p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--ink-2);
}
.lvl.on {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 18%, transparent);
}
.note {
  margin-top: 16px;
  font-size: 0.92rem;
  border-left: 3px solid var(--brand);
  padding-left: 12px;
}

/* Connectors */
.con-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}
.con-grid li {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  font-weight: 600;
  font-size: 0.92rem;
  display: flex;
  align-items: center;
  min-height: 72px;
}
.proto {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 32px;
}
.proto div {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.proto b {
  color: var(--brand);
}
.proto span {
  color: var(--ink-2);
  font-size: 0.95rem;
}
.fine {
  margin-top: 28px;
  font-size: 0.8rem;
  color: var(--ink-2);
  text-align: center;
}

/* Plans */
.plans {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}
.plan {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
}
.plan.featured {
  border-color: var(--brand);
  box-shadow:
    0 0 0 3px color-mix(in srgb, var(--brand) 15%, transparent),
    var(--shadow);
}
.plan .for {
  color: var(--ink-2);
  font-size: 0.92rem;
}
.plan ul {
  padding-left: 18px;
  margin: 0;
  color: var(--ink-2);
}
.plan li {
  padding: 3px 0;
}

/* Roadmap */
.roadmap {
  list-style: none;
  padding: 0;
  margin: 0 auto;
  max-width: 760px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.roadmap li {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
}
.roadmap li span {
  color: var(--ink-2);
  font-size: 0.94rem;
}
.roadmap li.now {
  border-color: var(--brand-2);
}
.roadmap li.now b::after {
  content: ' ●';
  color: var(--brand-2);
}

/* About */
.about { padding: 72px 0; }
.acro {
  font-size: clamp(1.7rem, 4vw, 2.8rem);
  font-weight: 500;
  color: var(--ink-2);
  margin-bottom: 0.6em;
}
.acro-2 {
  font-size: clamp(1.25rem, 2.8vw, 1.9rem);
  margin: -0.2em 0 1.4em;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.acro span { white-space: nowrap; }
.acro b { color: var(--brand); font-weight: 800; }
.tagline { font-style: normal; color: var(--ink-2); }

/* CTA */
.cta {
  background: linear-gradient(135deg, #4338ca, #0f766e);
  color: #fff;
}
.cta .sub {
  color: #e0e7ff;
}

/* Footer */
.foot {
  border-top: 1px solid var(--line);
  padding: 24px 0;
  color: var(--ink-2);
  font-size: 0.9rem;
}
.foot-in {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

@media (max-width: 960px) {
  .links {
    display: none;
  }
  .hero-in,
  .split {
    grid-template-columns: 1fr;
  }
  .grid,
  .grid-4,
  .plans,
  .proto {
    grid-template-columns: 1fr 1fr;
  }
  .con-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 600px) {
  .grid,
  .grid-4,
  .plans,
  .proto {
    grid-template-columns: 1fr;
  }
  .hero {
    padding-top: 40px;
  }
  .section {
    padding: 64px 0;
  }
  .nav-right .btn {
    display: none;
  }
}