:root {
  --ink: #14122b;
  --panel: #1d1a3d;
  --panel-2: #2b2750;
  --line: #383364;
  --text: #f3f1fb;
  --muted: #b9b4d6;
  --violet: #8b72f5;
  --violet-deep: #6c4de6;
  --teal: #19b8a9;
  --amber: #f0a43a;
  --serif: "Iowan Old Style", "Palatino Linotype", Cambria, Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font: 16px/1.55 var(--sans);
}
a { color: inherit; }
h1, h2, h3 { font-family: var(--serif); line-height: 1.15; margin: 0; }

.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px 16px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; text-decoration: none; }
.dot { width: 14px; height: 14px; border-radius: 50%; background: var(--violet-deep); box-shadow: 10px 0 0 var(--teal); margin-right: 10px; }
nav { display: flex; gap: 20px; flex-wrap: wrap; }
nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
nav a:hover { color: var(--text); }

main { max-width: 1100px; margin: 0 auto; padding: 0 16px 48px; }

.hero { display: grid; grid-template-columns: 1.5fr 1fr; gap: 40px; align-items: center; padding: 48px 0 56px; }
.eyebrow { color: var(--violet); font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; margin: 0 0 14px; }
h1 { font-size: clamp(34px, 6vw, 56px); }
.lead { color: var(--muted); font-size: 18px; max-width: 34em; margin: 20px 0 28px; }
.actions { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  font: inherit;
  font-size: 15px;
  text-decoration: none;
  cursor: pointer;
}
.btn:hover { border-color: var(--violet); }
.btn.primary { background: var(--violet-deep); border-color: var(--violet-deep); font-weight: 600; }
.btn.primary:hover { background: var(--violet); }

.stats { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.stats li { background: var(--panel); border-radius: 14px; padding: 18px 20px; }
.stats strong { display: block; font: 700 28px/1.1 var(--serif); color: var(--text); }
.stats li:nth-child(1) strong { color: var(--teal); }
.stats li:nth-child(2) strong { color: var(--violet); }
.stats li:nth-child(3) strong { color: var(--amber); }
.stats span { color: var(--muted); font-size: 14px; }

.panel { background: var(--panel); border-radius: 18px; padding: 32px; margin-bottom: 24px; }
.panel h2 { font-size: 30px; }
.sub { color: var(--muted); margin: 8px 0 24px; }

.demo { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 32px; align-items: start; }
canvas { display: block; width: 100%; height: auto; border-radius: 12px; background: #fff; }
.legend { display: flex; gap: 16px; flex-wrap: wrap; color: var(--muted); font-size: 13px; margin-top: 12px; }
.legend span { display: flex; align-items: center; gap: 6px; }
.legend i { width: 12px; height: 12px; border-radius: 50%; display: inline-block; }
.legend .a { background: #0e9f92; }
.legend .b { background: #e8961e; }
.legend .t { background: transparent; border: 2px solid var(--text); }
.legend .w { background: transparent; border: 2px solid #ff5d8f; }

fieldset { border: 0; padding: 0; margin: 0 0 20px; min-width: 0; }
legend { padding: 0; margin-bottom: 8px; color: var(--muted); font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase; }
legend output { color: var(--text); margin-left: 6px; }
.seg { display: flex; gap: 8px; flex-wrap: wrap; }
.seg.col { display: grid; grid-template-columns: 1fr 1fr; }
.seg button {
  padding: 9px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--ink);
  color: var(--muted);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
  text-align: left;
}
.seg button.on { background: var(--violet-deep); border-color: var(--violet-deep); color: #fff; }
input[type=range] { width: 100%; accent-color: var(--violet-deep); }

.readout { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 24px 0 0; }
.readout div { background: var(--ink); border-radius: 12px; padding: 14px 16px; }
.readout dt { color: var(--muted); font-size: 13px; }
.readout dd { margin: 4px 0 0; font: 700 26px/1 var(--serif); font-variant-numeric: tabular-nums; }

.viewer img { display: block; width: 100%; height: auto; border-radius: 12px; border: 1px solid var(--line); }
.bar { display: flex; justify-content: center; align-items: center; gap: 16px; margin-top: 16px; color: var(--muted); font-variant-numeric: tabular-nums; }

.steps { list-style: none; margin: 24px 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.steps li { background: var(--ink); border-radius: 14px; padding: 20px; }
.steps span { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--violet-deep); font-weight: 700; margin-bottom: 14px; }
.steps li:nth-child(2) span { background: var(--teal); color: var(--ink); }
.steps li:nth-child(3) span { background: var(--amber); color: var(--ink); }
.steps h3 { font-size: 20px; margin-bottom: 6px; }
.steps p { margin: 0; color: var(--muted); font-size: 15px; }
.note { color: var(--muted); margin: 0 0 10px; max-width: 60em; }
code { background: var(--ink); padding: 2px 6px; border-radius: 6px; font-size: 14px; }

footer {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px 16px 40px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 800px) {
  .hero, .demo { grid-template-columns: 1fr; }
  .hero { padding: 24px 0 32px; gap: 24px; }
  .panel { padding: 20px; }
  .steps { grid-template-columns: 1fr; }
}