:root {
  --bg: #0a0c0f;
  --bg-2: #0d1014;
  --panel: #11151a;
  --panel-2: #151a20;
  --line: rgba(232, 235, 238, .08);
  --line-2: rgba(232, 235, 238, .14);
  --text: #e8ebee;
  --dim: #a1a9b2;
  --mute: #697179;
  --sea: #5fd0c0;
  --sea-deep: #2a7f78;
  --warn: #ff8a5c;
  --warn-text: #ffc59e;
  --warn-soft: rgba(255, 138, 92, .1);
  --ok: #8fd694;
  --radius: 14px;
  --ease: cubic-bezier(.22, 1, .36, 1);
  --sans: "Onest", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "Cascadia Mono", monospace;
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; }
code, pre { font-family: var(--mono); }
::selection { background: rgba(95, 208, 192, .28); }

.wrap { width: min(1180px, 100% - 32px); margin-inline: auto; }

/* ------------------------------------------------------------ nav */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 20;
  transition: background .4s var(--ease), border-color .4s var(--ease), backdrop-filter .4s;
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: rgba(10, 12, 15, .78);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  border-bottom-color: var(--line);
}
.nav__row { display: flex; align-items: center; gap: 32px; height: 68px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: -.01em; font-size: 17px; }
.brand--quiet { color: var(--dim); font-size: 15px; }
.nav__links { display: flex; gap: 28px; margin-left: auto; font-size: 14.5px; color: var(--dim); }
.nav__links a { position: relative; transition: color .25s; }
.nav__links a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -4px; height: 1px;
  background: var(--sea); transform: scaleX(0); transform-origin: left; transition: transform .35s var(--ease);
}
.nav__links a:hover { color: var(--text); }
.nav__links a:hover::after { transform: scaleX(1); }

/* ------------------------------------------------------------ buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 46px; padding: 0 22px; border-radius: 999px;
  background: var(--text); color: #0b0d10; font-weight: 600; font-size: 15px;
  transition: transform .3s var(--ease), background .3s, box-shadow .3s;
  border: 0; cursor: pointer; font-family: inherit;
}
.btn:hover { background: #fff; transform: translateY(-1px); box-shadow: 0 10px 30px -12px rgba(95, 208, 192, .55); }
.btn:active { transform: translateY(0); }
.btn--ghost { background: transparent; color: var(--text); box-shadow: inset 0 0 0 1px var(--line-2); }
.btn--ghost:hover { background: rgba(232, 235, 238, .05); box-shadow: inset 0 0 0 1px rgba(232, 235, 238, .26); }
.btn--small { height: 38px; padding: 0 18px; font-size: 14px; }
.nav .btn--small { margin-left: 4px; }
.nav__reg { font-size: 14.5px; color: var(--dim); transition: color .25s; }
.nav__reg:hover { color: var(--text); }

/* ------------------------------------------------------------ type */
.eyebrow {
  margin: 0 0 18px; font: 500 12.5px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--sea);
}
h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -.03em; }
h1 { font-size: clamp(38px, 5.2vw, 64px); line-height: 1.04; max-width: 15ch; }
h2 { font-size: clamp(28px, 3.6vw, 44px); line-height: 1.08; max-width: 22ch; }
h3 { font-size: 19px; letter-spacing: -.015em; line-height: 1.3; }
.lead { margin: 26px 0 0; max-width: 54ch; font-size: 18px; color: var(--dim); }

/* ------------------------------------------------------------ hero */
.hero { position: relative; padding: 150px 0 140px; overflow: hidden; isolation: isolate; }
.hero__sky {
  position: absolute; inset: 0; z-index: -2;
  background:
    radial-gradient(60% 55% at 70% 100%, rgba(95, 208, 192, .16), transparent 70%),
    radial-gradient(40% 40% at 15% 10%, rgba(122, 167, 255, .07), transparent 70%),
    linear-gradient(180deg, var(--bg) 0%, #0b1013 100%);
}
.hero__sky::after {
  content: ""; position: absolute; inset: 0;
  background-image: radial-gradient(rgba(232, 235, 238, .5) .6px, transparent .6px);
  background-size: 120px 120px; background-position: 13px 27px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,.5), transparent 60%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0,0,0,.5), transparent 60%);
  opacity: .35;
}
.hero__sea { position: absolute; left: 0; right: 0; bottom: 0; width: 100%; height: 220px; z-index: -1; }
.wave { fill: none; stroke-width: 1.2; vector-effect: non-scaling-stroke; animation: drift linear infinite; }
.wave--1 { stroke: rgba(95, 208, 192, .32); animation-duration: 46s; }
.wave--2 { stroke: rgba(95, 208, 192, .18); animation-duration: 30s; animation-direction: reverse; }
.wave--3 { stroke: rgba(232, 235, 238, .1); animation-duration: 70s; }
@keyframes drift { to { transform: translateX(-1440px); } }

.hero__grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: 64px; align-items: center; }
.hero__actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.facts { display: flex; gap: 36px; margin: 52px 0 0; padding-top: 26px; border-top: 1px solid var(--line); }
.facts div { min-width: 0; }
.facts dt { font-size: 26px; font-weight: 600; letter-spacing: -.02em; }
.facts dd { margin: 2px 0 0; color: var(--mute); font-size: 13.5px; line-height: 1.4; max-width: 18ch; }

/* ------------------------------------------------------------ chat demo */
.hero__demo { position: relative; }
.chat {
  background: linear-gradient(180deg, rgba(21, 26, 32, .92), rgba(14, 17, 21, .92));
  border: 1px solid var(--line-2); border-radius: 18px;
  box-shadow: 0 40px 80px -40px rgba(0, 0, 0, .8), 0 0 0 1px rgba(0, 0, 0, .4);
  overflow: hidden;
}
.chat__bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px; border-bottom: 1px solid var(--line); font-size: 13px;
}
.chat__title { font-weight: 600; }
.chat__status { display: inline-flex; align-items: center; gap: 8px; color: var(--dim); font-family: var(--mono); font-size: 12px; }
.chat__status i { width: 7px; height: 7px; border-radius: 50%; background: var(--sea); box-shadow: 0 0 0 0 rgba(95, 208, 192, .6); animation: pulse 2.4s infinite; }
@keyframes pulse { 70% { box-shadow: 0 0 0 7px rgba(95, 208, 192, 0); } 100% { box-shadow: 0 0 0 0 rgba(95, 208, 192, 0); } }

.chat__list { list-style: none; margin: 0; padding: 12px 10px; height: 336px; display: flex; flex-direction: column; justify-content: flex-end; gap: 2px; overflow: hidden; }
.msg {
  display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 12px; align-items: center;
  padding: 8px 10px; border-radius: 10px; font-family: var(--mono); font-size: 13.2px; line-height: 1.45;
  animation: msg-in .55s var(--ease) both;
  transition: background .5s var(--ease), opacity .5s var(--ease);
}
.msg__text { min-width: 0; overflow-wrap: anywhere; }
.msg__who { color: var(--sea); }
.msg__who::after { content: ":"; color: var(--mute); margin-right: 6px; }
.msg__body { color: var(--text); transition: color .5s, text-decoration-color .5s; text-decoration: line-through transparent; }
.msg__tag {
  font-size: 11px; font-family: var(--mono); color: var(--mute); white-space: nowrap;
  padding: 3px 8px; border-radius: 999px; border: 1px solid transparent; transition: all .4s var(--ease);
}
.msg__tag.is-checking { color: var(--dim); background: linear-gradient(90deg, rgba(232,235,238,.04), rgba(232,235,238,.12), rgba(232,235,238,.04)); background-size: 200% 100%; animation: shimmer 1.1s linear infinite; }
.msg__tag.is-clean { color: var(--mute); }
.msg.is-flagged { background: var(--warn-soft); }
.msg.is-flagged .msg__body { color: var(--warn-text); text-decoration-color: rgba(255, 138, 92, .55); }
.msg.is-flagged .msg__tag { color: var(--warn); border-color: rgba(255, 138, 92, .35); }
.msg.is-old { opacity: .55; }
@keyframes msg-in { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@keyframes shimmer { to { background-position: -200% 0; } }

.decision {
  position: relative; margin: 14px 0 0 auto; width: min(360px, 92%);
  padding: 16px 18px; border-radius: 14px;
  background: rgba(17, 21, 26, .96); border: 1px solid rgba(255, 138, 92, .28);
  box-shadow: 0 30px 60px -30px rgba(0, 0, 0, .9);
  opacity: 0; transform: translateY(12px) scale(.98); transition: opacity .5s var(--ease), transform .5s var(--ease);
  pointer-events: none;
}
.decision.is-visible { opacity: 1; transform: none; }
.decision__head { display: flex; justify-content: space-between; font: 500 11px/1 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--mute); }
.decision__conf { color: var(--warn); }
.decision__title { margin: 10px 0 4px; font-weight: 600; font-size: 15px; }
.decision__why { margin: 0 0 12px; color: var(--dim); font-size: 13.5px; line-height: 1.45; }
.decision__cmd { display: block; padding: 8px 10px; border-radius: 8px; background: rgba(0, 0, 0, .35); color: var(--sea); font-size: 12px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* ------------------------------------------------------------ sections */
.section { padding: 120px 0; position: relative; }
.section--alt { background: var(--bg-2); border-block: 1px solid var(--line); }
.section__head { margin-bottom: 56px; }
.section__sub { margin: 18px 0 0; max-width: 62ch; color: var(--dim); }

.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; border-top: 1px solid var(--line); }
.step { padding: 34px 32px 8px 0; position: relative; }
.step + .step { padding-left: 32px; border-left: 1px solid var(--line); }
.step::before {
  content: ""; position: absolute; top: -1px; left: 0; height: 1px; width: 100%;
  background: linear-gradient(90deg, var(--sea), transparent); transform: scaleX(0); transform-origin: left;
  transition: transform 1.2s var(--ease) .15s;
}
.step.is-in::before { transform: scaleX(1); }
.step__num { display: block; margin-bottom: 26px; font: 500 13px/1 var(--mono); color: var(--sea); }
.step p { margin: 12px 0 0; color: var(--dim); font-size: 15.5px; }

/* ------------------------------------------------------------ lab */
.lab {
  display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 24px;
  grid-template-areas: "controls result" "config config";
}
.lab__controls { grid-area: controls; display: flex; flex-direction: column; gap: 26px; padding: 26px; border-radius: var(--radius); background: var(--panel); border: 1px solid var(--line); }
.lab__result { grid-area: result; padding: 18px; border-radius: var(--radius); background: var(--panel); border: 1px solid var(--line); display: flex; flex-direction: column; }
.lab__config { grid-area: config; margin: 0; }
fieldset { margin: 0; padding: 0; border: 0; min-width: 0; }
legend { padding: 0; margin-bottom: 12px; font: 500 12px/1 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--mute); }
.hint { margin: 10px 0 0; font-size: 13px; line-height: 1.45; color: var(--mute); min-height: 3.6em; }

.seg { position: relative; display: flex; padding: 4px; border-radius: 12px; background: rgba(0, 0, 0, .3); border: 1px solid var(--line); }
.seg label { flex: 1; position: relative; }
.seg input { position: absolute; opacity: 0; pointer-events: none; }
.seg span {
  display: block; text-align: center; padding: 8px 6px; border-radius: 9px; font-size: 13.5px; color: var(--dim); cursor: pointer;
  transition: background .35s var(--ease), color .25s;
}
.seg input:checked + span { background: var(--panel-2); color: var(--text); box-shadow: 0 1px 0 rgba(255,255,255,.05) inset, 0 6px 14px -8px rgba(0,0,0,.8); }
.seg input:focus-visible + span { outline: 2px solid var(--sea); outline-offset: 1px; }

.switch { display: flex; align-items: center; gap: 12px; padding: 7px 0; cursor: pointer; font-size: 14.5px; }
.switch input { position: absolute; opacity: 0; pointer-events: none; }
.switch__ui { flex: none; position: relative; width: 36px; height: 20px; border-radius: 999px; background: rgba(232,235,238,.12); transition: background .35s var(--ease); }
.switch__ui::after { content: ""; position: absolute; top: 3px; left: 3px; width: 14px; height: 14px; border-radius: 50%; background: var(--dim); transition: transform .35s var(--ease), background .35s; }
.switch input:checked + .switch__ui { background: var(--sea-deep); }
.switch input:checked + .switch__ui::after { transform: translateX(16px); background: #fff; }
.switch input:focus-visible + .switch__ui { outline: 2px solid var(--sea); outline-offset: 2px; }

.feed { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 2px; }
.feed .msg { animation: none; grid-template-columns: minmax(0, 1fr) auto; }
.feed .msg__tag { min-width: 0; }
.msg.is-hidden .msg__body { filter: blur(3.5px); opacity: .6; }
.msg.is-hidden .msg__body, .msg__body { transition: filter .5s var(--ease), opacity .5s, color .5s, text-decoration-color .5s; }
.msg__note { display: block; margin-top: 2px; font-size: 11.5px; color: var(--mute); font-family: var(--sans); }
.lab__summary { margin-top: auto; padding: 16px 10px 4px; border-top: 1px solid var(--line); color: var(--dim); font-size: 14px; }
.lab__summary b { color: var(--text); font-weight: 600; }

/* ------------------------------------------------------------ code */
.code {
  margin: 0; padding: 22px 24px; border-radius: var(--radius); background: #080a0c; border: 1px solid var(--line);
  font-size: 13.5px; line-height: 1.7; color: var(--dim); overflow-x: auto;
}
.code .c { color: var(--mute); }
.code .k { color: var(--sea); }
.code .s { color: var(--text); }
.code .n { color: var(--warn-text); }
.code .off { color: var(--mute); text-decoration: line-through; }
.code code > span { border-radius: 4px; transition: background 1.2s var(--ease); }
.code code > span.changed { background: rgba(95, 208, 192, .14); transition: none; }

/* ------------------------------------------------------------ features */
.features { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.feature { padding: 34px 30px 38px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); transition: background .4s var(--ease); }
.feature:hover { background: rgba(232, 235, 238, .02); }
.feature svg { width: 24px; height: 24px; margin-bottom: 26px; fill: none; stroke: var(--sea); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.feature p { margin: 12px 0 0; color: var(--dim); font-size: 15px; }

/* ------------------------------------------------------------ connect */
.connect { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 64px; align-items: center; }
.connect__steps { margin: 26px 0 32px; padding-left: 20px; color: var(--dim); }
.connect__steps li { margin: 8px 0; padding-left: 6px; }
.connect__steps li::marker { color: var(--sea); font-family: var(--mono); font-size: 13px; }
.connect__steps code { font-size: 13px; color: var(--text); background: rgba(232,235,238,.06); padding: 2px 6px; border-radius: 5px; }

/* ------------------------------------------------------------ footer */
.footer { padding: 40px 0 48px; }
.footer__row { display: flex; align-items: center; gap: 24px; font-size: 14px; color: var(--mute); }
.footer__note { margin-right: auto; }
.footer a { color: var(--dim); transition: color .25s; }
.footer a:hover { color: var(--text); }

/* ------------------------------------------------------------ reveal */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}

/* ------------------------------------------------------------ responsive */
@media (max-width: 980px) {
  .hero { padding: 120px 0 130px; }
  .hero__grid, .connect { grid-template-columns: 1fr; gap: 56px; }
  .lab { grid-template-columns: 1fr; grid-template-areas: "controls" "result" "config"; }
  .features { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .nav__links { display: none; }
  .nav__reg { margin-left: auto; }
  .facts { gap: 20px; flex-wrap: wrap; }
  .steps { grid-template-columns: 1fr; }
  .step, .step + .step { padding: 28px 0 24px; border-left: 0; }
  .step + .step { border-top: 1px solid var(--line); }
  .features { grid-template-columns: 1fr; }
  .section { padding: 88px 0; }
  .footer__row { flex-wrap: wrap; gap: 10px 20px; }
  .chat__list { height: 300px; }
  .decision { width: 100%; }
  .msg { font-size: 12.5px; }
}