:root {
  --bg: #0a0c12;
  --bg-soft: #11141d;
  --panel: #151926;
  --border: #242a3d;
  --border-soft: #1c2132;
  --text: #e8eaf2;
  --muted: #949bb3;
  --dim: #6d7590;
  --accent: #6c8cff;
  --accent-soft: #8fa5ff;
  --accent-dim: rgba(108, 140, 255, 0.12);
  --green: #4ade80;
  --radius: 14px;
  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(900px 500px at 78% -8%, rgba(108, 140, 255, 0.16), transparent 60%),
    radial-gradient(700px 420px at 8% 4%, rgba(78, 220, 190, 0.07), transparent 60%);
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

a { color: var(--accent-soft); text-decoration: none; }
a:hover { color: #b3c2ff; }

h1, h2, h3 { line-height: 1.15; letter-spacing: -0.02em; margin: 0; }
h1 { font-size: clamp(2.3rem, 5.5vw, 3.65rem); font-weight: 700; }
h2 { font-size: clamp(1.6rem, 3.2vw, 2.15rem); font-weight: 650; }
h3 { font-size: 1.08rem; font-weight: 620; letter-spacing: -0.01em; }
p { margin: 0 0 1em; }

header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 12, 18, 0.82);
  backdrop-filter: saturate(150%) blur(14px);
  -webkit-backdrop-filter: saturate(150%) blur(14px);
  border-bottom: 1px solid var(--border-soft);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 660;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  white-space: nowrap;
}
.brand:hover { color: var(--text); }
.brand svg { display: block; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 0.94rem;
}
.nav-links a { color: var(--muted); }
.nav-links a:hover { color: var(--text); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 580;
  font-size: 0.96rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.15s ease, border-color 0.15s ease;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 24px -10px rgba(108, 140, 255, 0.85);
}
.btn-primary:hover { background: #7d99ff; color: #fff; }

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}
.btn-ghost:hover { border-color: #39415c; background: rgba(255, 255, 255, 0.03); color: var(--text); }

.btn-sm { padding: 9px 16px; font-size: 0.9rem; }

.hero { padding: 92px 0 34px; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 13px;
  border-radius: 100px;
  background: var(--accent-dim);
  border: 1px solid rgba(108, 140, 255, 0.28);
  color: var(--accent-soft);
  font-size: 0.83rem;
  font-weight: 540;
  margin-bottom: 26px;
}

.hero p.lede {
  font-size: 1.18rem;
  color: var(--muted);
  max-width: 60ch;
  margin: 22px 0 34px;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

.hero-note {
  margin-top: 22px;
  font-size: 0.88rem;
  color: var(--dim);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}
.hero-note span { display: inline-flex; align-items: center; gap: 7px; }
.dot { width: 5px; height: 5px; border-radius: 50%; background: var(--green); flex: none; }

.demo {
  margin-top: 62px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: linear-gradient(180deg, var(--panel), #0f1320);
  overflow: hidden;
  box-shadow: 0 40px 80px -40px rgba(0, 0, 0, 0.9);
}

.demo-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 13px 18px;
  border-bottom: 1px solid var(--border-soft);
  background: rgba(255, 255, 255, 0.015);
}
.demo-bar i { width: 11px; height: 11px; border-radius: 50%; background: #2c3348; display: block; }
.demo-bar b {
  margin-left: 12px;
  font-weight: 500;
  font-size: 0.83rem;
  color: var(--dim);
  font-family: var(--mono);
}

.demo-body { padding: 26px; display: grid; gap: 18px; }

.msg {
  border: 1px solid var(--border-soft);
  border-radius: 12px;
  padding: 16px 18px;
  background: #0e111b;
}
.msg .who {
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--dim);
  margin-bottom: 8px;
  font-weight: 600;
}
.msg p { margin: 0; color: #c3c9dc; font-size: 0.97rem; }

.msg.reply { border-color: rgba(108, 140, 255, 0.35); background: rgba(108, 140, 255, 0.05); }
.msg.reply .who { color: var(--accent-soft); }
.msg.reply p { color: var(--text); }

.tone-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.chip {
  font-size: 0.83rem;
  padding: 6px 13px;
  border-radius: 100px;
  border: 1px solid var(--border);
  color: var(--muted);
  background: #0e111b;
}
.chip.on { border-color: var(--accent); color: var(--accent-soft); background: var(--accent-dim); }

section { padding: 82px 0; position: relative; z-index: 1; }
section.alt { background: var(--bg-soft); border-top: 1px solid var(--border-soft); border-bottom: 1px solid var(--border-soft); }

.sec-head { max-width: 62ch; margin-bottom: 46px; }
.sec-head p { color: var(--muted); margin: 14px 0 0; font-size: 1.05rem; }

.grid { display: grid; gap: 18px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  background: var(--panel);
}
.card h3 { margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 0.96rem; margin: 0; }

.icon {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--accent-dim);
  border: 1px solid rgba(108, 140, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
  color: var(--accent-soft);
}

.steps { counter-reset: step; display: grid; gap: 18px; grid-template-columns: repeat(3, 1fr); }
.step {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  background: var(--panel);
  position: relative;
}
.step::before {
  counter-increment: step;
  content: counter(step);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 660;
  margin-bottom: 16px;
}
.step h3 { margin-bottom: 8px; }
.step p { color: var(--muted); font-size: 0.96rem; margin: 0; }

.tones { display: flex; flex-wrap: wrap; gap: 10px; }
.tone {
  padding: 11px 19px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--panel);
  font-size: 0.95rem;
  color: var(--text);
}

details {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel);
  margin-bottom: 12px;
  overflow: hidden;
}
details summary {
  cursor: pointer;
  padding: 19px 22px;
  font-weight: 570;
  font-size: 1.02rem;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
details summary::-webkit-details-marker { display: none; }
details summary::after {
  content: "+";
  color: var(--dim);
  font-size: 1.35rem;
  font-weight: 400;
  line-height: 1;
  flex: none;
}
details[open] summary::after { content: "\2212"; }
details[open] summary { border-bottom: 1px solid var(--border-soft); }
details .answer { padding: 18px 22px; color: var(--muted); font-size: 0.97rem; }
details .answer p:last-child { margin-bottom: 0; }

.cta {
  border: 1px solid rgba(108, 140, 255, 0.3);
  border-radius: 18px;
  padding: 52px 44px;
  background:
    radial-gradient(700px 300px at 80% 0%, rgba(108, 140, 255, 0.18), transparent 65%),
    var(--panel);
  text-align: center;
}
.cta p { color: var(--muted); max-width: 50ch; margin: 14px auto 28px; }

.prose { padding: 62px 0 90px; max-width: 74ch; }
.prose h1 { font-size: clamp(1.9rem, 4vw, 2.5rem); margin-bottom: 10px; }
.prose .updated { color: var(--dim); font-size: 0.9rem; margin-bottom: 42px; }
.prose h2 {
  font-size: 1.3rem;
  margin: 42px 0 14px;
  padding-top: 18px;
  border-top: 1px solid var(--border-soft);
}
.prose h2:first-of-type { border-top: none; padding-top: 0; }
.prose p, .prose li { color: #c3c9dc; font-size: 1rem; }
.prose ul { padding-left: 22px; margin: 0 0 1em; }
.prose li { margin-bottom: 8px; }
.prose strong { color: var(--text); }

.callout {
  border: 1px solid rgba(108, 140, 255, 0.3);
  background: var(--accent-dim);
  border-radius: 12px;
  padding: 18px 20px;
  margin: 0 0 32px;
}
.callout p { margin: 0; font-size: 0.95rem; color: #cdd5f0; }

footer {
  border-top: 1px solid var(--border-soft);
  padding: 44px 0;
  background: var(--bg-soft);
  position: relative;
  z-index: 1;
}
.foot {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  align-items: center;
  justify-content: space-between;
}
.foot-links { display: flex; flex-wrap: wrap; gap: 24px; font-size: 0.92rem; }
.foot-links a { color: var(--muted); }
.foot-links a:hover { color: var(--text); }
.copy { color: var(--dim); font-size: 0.88rem; }

.center-page {
  min-height: 66vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 8px;
  padding: 80px 0;
}
.center-page p { color: var(--muted); max-width: 44ch; }

@media (max-width: 900px) {
  .grid-3, .steps { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .nav-links { display: none; }
  .hero { padding: 62px 0 20px; }
  section { padding: 62px 0; }
  .grid-3, .grid-2, .steps { grid-template-columns: 1fr; }
  .demo-body { padding: 18px; }
  .cta { padding: 38px 24px; }
  .foot { flex-direction: column; align-items: flex-start; gap: 18px; }
  .demo { margin-top: 44px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

a:focus-visible, .btn:focus-visible, summary:focus-visible {
  outline: 2px solid var(--accent-soft);
  outline-offset: 3px;
  border-radius: 6px;
}