:root{
  --bg: #ffffff;
  --bg2:#fafafa;
  --text:#0f172a;
  --muted:#64748b;
  --line:#e5e7eb;
  --card:#ffffff;
  --shadow: 0 18px 50px rgba(2,6,23,.08);
  --radius: 18px;
  --radius2: 24px;
  --max: 1140px;
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono","Courier New", monospace;
}

[data-theme="dark"]{
  --bg:#0b1020;
  --bg2:#0f1730;
  --text:#e5e7eb;
  --muted:#a8b2c3;
  --line: rgba(229,231,235,.16);
  --card: rgba(255,255,255,.04);
  --shadow: 0 18px 60px rgba(0,0,0,.30);
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.55;
}

a{ color:inherit; text-decoration:none; }
a:hover{ text-decoration:underline; text-underline-offset:4px; }

.container{
  width:min(var(--max), calc(100% - 40px));
  margin-inline:auto;
}

.skip{
  position:absolute;
  left:-999px;
  top:10px;
  background:var(--text);
  color:var(--bg);
  padding:10px 14px;
  border-radius:12px;
  z-index:9999;
}
.skip:focus{ left:10px; }

.sr{
  position:absolute;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;clip:rect(0,0,0,0);
  border:0;
}

/* Header / Nav */
.header{
  position:sticky;
  top:0;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(10px);
  border-bottom:1px solid var(--line);
  z-index:50;
}

.header__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:14px 0;
  gap:16px;
}

.brand{
  display:flex;
  align-items:center;
  gap:10px;
  font-weight:650;
  letter-spacing:.2px;
}
.brand__dot{
  width:12px;height:12px;
  border-radius:999px;
  background:var(--text);
  box-shadow: 0 0 0 6px color-mix(in srgb, var(--text) 8%, transparent);
}
.brand__name{ font-size:15px; }
.muted{ color:var(--muted); }

.nav{ display:flex; align-items:center; }
.nav__toggle{
  display:none;
  border:1px solid var(--line);
  background:var(--bg);
  border-radius:12px;
  width:42px;height:42px;
  cursor:pointer;
}
.hamburger{
  display:block;
  width:18px;height:2px;
  background:var(--text);
  margin-inline:auto;
  position:relative;
}
.hamburger::before,
.hamburger::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;height:2px;
  background:var(--text);
}
.hamburger::before{ top:-6px; }
.hamburger::after{ top:6px; }

.nav__menu{
  display:flex;
  align-items:center;
  gap:18px;
}
.nav__link{
  color:var(--muted);
  font-size:14px;
}
.nav__link.is-active{ color:var(--text); font-weight:600; }
.nav__cta{
  border:1px solid var(--line);
  padding:10px 12px;
  border-radius:999px;
  font-size:14px;
  font-weight:600;
  background:var(--bg);
}
.nav__cta:hover{ text-decoration:none; box-shadow: 0 10px 30px rgba(2,6,23,.08); }

@media (max-width: 880px){
  .nav__toggle{ display:inline-flex; align-items:center; justify-content:center; }
  .nav__menu{
    display:none;
    position:absolute;
    right:20px;
    top:64px;
    width:min(320px, calc(100vw - 40px));
    flex-direction:column;
    align-items:stretch;
    gap:10px;
    background:var(--bg);
    border:1px solid var(--line);
    border-radius:18px;
    padding:12px;
    box-shadow: var(--shadow);
  }
  .nav__menu.is-open{ display:flex; }
  .nav__link, .nav__cta{ padding:12px 12px; border-radius:14px; }
  .nav__cta{ text-align:center; }
}

/* Hero */
.hero{
  padding:58px 0 18px;
  border-bottom:1px solid var(--line);
}
.hero__grid{
  display:grid;
  grid-template-columns: 1.05fr .95fr;
  gap:28px;
  align-items:start;
}
@media (max-width: 980px){
  .hero__grid{ grid-template-columns:1fr; }
}

.kicker{
  color:var(--muted);
  font-size:13px;
  letter-spacing:.14em;
  text-transform:uppercase;
  margin:0 0 12px;
}

h1{
  font-size: clamp(34px, 4.2vw, 54px);
  line-height:1.06;
  margin:0 0 14px;
  letter-spacing:-.02em;
}

.lead{
  font-size:18px;
  color: color-mix(in srgb, var(--text) 86%, var(--muted));
  margin:0 0 18px;
}

.hero__actions{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
  margin:18px 0 18px;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:12px 14px;
  border-radius:999px;
  background:var(--text);
  color:var(--bg);
  border:1px solid var(--text);
  font-weight:650;
  font-size:14px;
  box-shadow: 0 16px 40px rgba(2,6,23,.10);
}
.btn:hover{ text-decoration:none; transform: translateY(-1px); }
.btn:active{ transform: translateY(0); }

.btn--ghost{
  background:transparent;
  color:var(--text);
  border:1px solid var(--line);
  box-shadow:none;
}
.btn--ghost:hover{ box-shadow: 0 16px 40px rgba(2,6,23,.08); }

.hero__meta{
  display:flex;
  gap:10px;
  flex-wrap:wrap;
}

.pill{
  border:1px solid var(--line);
  padding:10px 12px;
  border-radius:16px;
  background: color-mix(in srgb, var(--bg) 88%, var(--bg2));
  min-width: 230px;
}
.pill__title{
  display:block;
  font-size:12px;
  color:var(--muted);
  margin-bottom:2px;
}
.pill__text{
  display:block;
  font-size:14px;
  font-weight:600;
}

/* Panel / Diagram */
.panel{
  border:1px solid var(--line);
  border-radius: var(--radius2);
  background: var(--card);
  box-shadow: var(--shadow);
  overflow:hidden;
}
.panel__top{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:14px 14px 8px;
  border-bottom:1px solid var(--line);
}
.panel__toggles{ display:flex; gap:8px; }

.iconbtn{
  width:38px;height:38px;
  border-radius:12px;
  border:1px solid var(--line);
  background:var(--bg);
  cursor:pointer;
}
.iconbtn:hover{ box-shadow: 0 10px 24px rgba(2,6,23,.10); }
.icon{ font-size:16px; }

.chip{
  display:inline-flex;
  align-items:center;
  padding:7px 10px;
  border-radius:999px;
  border:1px solid var(--line);
  font-size:12px;
  color:var(--muted);
  background: color-mix(in srgb, var(--bg) 90%, var(--bg2));
}

.diagram{
  position:relative;
  padding:12px 12px 2px;
}
.diagram svg{ width:100%; height:auto; display:block; }

.node{
  fill: color-mix(in srgb, var(--bg) 92%, var(--bg2));
  stroke: var(--line);
  stroke-width:1.2;
  cursor:pointer;
}
.node--core{ stroke: color-mix(in srgb, var(--text) 22%, var(--line)); }
.node--ai{ stroke: color-mix(in srgb, var(--text) 28%, var(--line)); }

.node__title{
  font-size: 14px;
  font-weight:700;
  fill: var(--text);
}
.node__sub{
  font-size: 11.5px;
  fill: var(--muted);
}
.link{
  fill:none;
  stroke: color-mix(in srgb, var(--text) 40%, var(--line));
  stroke-width: 2.2;
  stroke-linecap: round;
}
.link--soft{ stroke-dasharray: 4 6; opacity:.55; }
.legend{
  font-size: 11.5px;
  fill: var(--muted);
}

.tooltip{
  position:absolute;
  max-width: 260px;
  background: var(--bg);
  border:1px solid var(--line);
  border-radius:16px;
  padding:10px 12px;
  box-shadow: var(--shadow);
  transform: translate(-50%, -100%);
  pointer-events:none;
  opacity:0;
  transition: opacity .15s ease;
}
.tooltip.is-on{ opacity:1; }
.tooltip__title{
  font-weight:750;
  font-size:13px;
  margin-bottom:4px;
}
.tooltip__text{
  color:var(--muted);
  font-size:13px;
}

.panel__bottom{
  padding:10px 14px 14px;
  border-top:1px solid var(--line);
}
.stats{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:10px;
}
@media (max-width: 500px){
  .stats{ grid-template-columns:1fr; }
}
.stat{
  border:1px solid var(--line);
  border-radius:16px;
  padding:10px 12px;
  background: color-mix(in srgb, var(--bg) 86%, var(--bg2));
}
.stat__k{
  font-family:var(--mono);
  font-weight:800;
  letter-spacing:.02em;
}
.stat__v{ color:var(--muted); font-size:13px; }

/* Sections */
.section{ padding:54px 0; }
.section--soft{ background: var(--bg2); border-top:1px solid var(--line); border-bottom:1px solid var(--line); }

.section__head{
  margin-bottom:18px;
}
.section__head h2{
  margin:0 0 8px;
  font-size:26px;
  letter-spacing:-.02em;
}
.section__head p{ margin:0; }

.grid3{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:14px;
}
.grid2{
  display:grid;
  grid-template-columns: repeat(2, 1fr);
  gap:14px;
}
@media (max-width: 980px){
  .grid3{ grid-template-columns:1fr; }
  .grid2{ grid-template-columns:1fr; }
}

.card{
  border:1px solid var(--line);
  border-radius: var(--radius);
  padding:16px;
  background: var(--card);
  box-shadow: 0 10px 26px rgba(2,6,23,.05);
}
.card h3, .card h2{
  margin:0 0 8px;
  letter-spacing:-.02em;
}
.card p{ margin:0 0 10px; color: color-mix(in srgb, var(--text) 82%, var(--muted)); }
.list{
  margin:10px 0 0;
  padding-left:18px;
  color:var(--muted);
}
.mini{
  display:inline-block;
  margin-top:6px;
  font-size:12px;
  color:var(--muted);
  border:1px dashed var(--line);
  padding:6px 10px;
  border-radius:999px;
}

/* Split / Callout */
.split{
  display:grid;
  grid-template-columns: 1.15fr .85fr;
  gap:14px;
  align-items:start;
}
@media (max-width: 980px){
  .split{ grid-template-columns:1fr; }
}
.callout{
  border:1px solid var(--line);
  border-radius: var(--radius2);
  padding:18px;
  background: color-mix(in srgb, var(--bg) 82%, var(--bg2));
}
.callout h3{ margin:0 0 8px; }
.callout p{ margin:0 0 12px; color: var(--muted); }
.callout__row{ display:flex; flex-wrap:wrap; gap:8px; }

.badge{
  display:inline-flex;
  align-items:center;
  padding:7px 10px;
  border-radius:999px;
  border:1px solid var(--line);
  font-size:12px;
  color:var(--muted);
  background: var(--bg);
}

.note{
  border:1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 90%, var(--bg2));
  border-radius:16px;
  padding:12px 12px;
  color:var(--muted);
}

/* Usecases */
.usecases{ margin-top:10px; }
.chips{
  display:flex;
  gap:8px;
  flex-wrap:wrap;
  margin-bottom:12px;
}
.chipbtn{
  border:1px solid var(--line);
  background:var(--bg);
  color:var(--muted);
  padding:10px 12px;
  border-radius:999px;
  font-size:13px;
  font-weight:650;
  cursor:pointer;
}
.chipbtn.is-active{
  background:var(--text);
  border-color:var(--text);
  color:var(--bg);
}
.chipbtn:focus{ outline:2px solid color-mix(in srgb, var(--text) 50%, transparent); outline-offset:2px; }

/* CTA */
.cta{
  margin-top:18px;
  border:1px solid var(--line);
  border-radius: var(--radius2);
  padding:18px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  background: var(--card);
}
@media (max-width: 760px){
  .cta{ flex-direction:column; align-items:stretch; }
  .cta__actions{ justify-content:flex-start; }
}
.cta h3{ margin:0 0 6px; }
.cta p{ margin:0; }
.cta__actions{
  display:flex;
  gap:10px;
  justify-content:flex-end;
  flex-wrap:wrap;
}

/* Page head */
.pagehead{
  padding:40px 0 14px;
  border-bottom:1px solid var(--line);
}
.pagehead h1{
  margin:0 0 10px;
  font-size: clamp(30px, 4vw, 46px);
}
.pagehead .lead{ margin:0; }

/* Stack */
.stack{ display:grid; gap:12px; }
.stack__item{
  display:grid;
  grid-template-columns: 90px 1fr;
  gap:12px;
  align-items:stretch;
  border:1px solid var(--line);
  border-radius: var(--radius2);
  background: var(--card);
  padding:12px;
}
@media (max-width: 600px){
  .stack__item{ grid-template-columns:1fr; }
}
.stack__tag{
  font-family:var(--mono);
  font-size:12px;
  color:var(--muted);
  border:1px solid var(--line);
  border-radius:14px;
  padding:10px 10px;
  background: color-mix(in srgb, var(--bg) 88%, var(--bg2));
  display:flex;
  align-items:center;
  justify-content:center;
  height:fit-content;
}
.stack__body h3{ margin:0 0 4px; }
.stack__body p{ margin:0 0 10px; color:var(--muted); }
.row{ display:flex; flex-wrap:wrap; gap:8px; }

.hint{
  margin-top:14px;
  border:1px solid var(--line);
  border-radius:18px;
  padding:14px;
  background: color-mix(in srgb, var(--bg) 90%, var(--bg2));
  color: var(--muted);
}

/* Timeline */
.timeline{ display:grid; gap:12px; }
.titem{
  display:grid;
  grid-template-columns: 22px 1fr;
  gap:12px;
  align-items:start;
}
.titem__dot{
  width:14px;height:14px;
  border-radius:999px;
  background: var(--text);
  box-shadow: 0 0 0 6px color-mix(in srgb, var(--text) 10%, transparent);
  margin-top:6px;
}
.titem__body{
  border:1px solid var(--line);
  border-radius:18px;
  padding:14px;
  background: var(--card);
}
.titem__body h3{ margin:0 0 6px; }
.titem__body p{ margin:0 0 8px; color:var(--muted); }

/* Accordion */
.accordion{ display:grid; gap:10px; }
.acc{
  border:1px solid var(--line);
  border-radius:18px;
  background: var(--card);
  padding: 2px 10px;
}
.acc summary{
  cursor:pointer;
  padding: 12px 6px;
  font-weight:650;
  list-style:none;
}
.acc summary::-webkit-details-marker{ display:none; }
.acc__body{
  padding: 0 6px 12px;
  color:var(--muted);
}

/* Footer */
.footer{ padding: 22px 0 4px; }
.footer--plain{ border-top:1px solid var(--line); background: var(--bg); }
.footer__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  flex-wrap:wrap;
}
.footlink{
  color:var(--muted);
  margin-left:14px;
  font-size:14px;
}
.footlink:hover{ color:var(--text); text-decoration:none; }