:root {
  color-scheme: dark;
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  background: #080b12;
  color: #edf4ff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 12% 8%, #123852 0, transparent 30rem),
    radial-gradient(circle at 88% 92%, #40163c 0, transparent 34rem),
    #080b12;
}

button, input { font: inherit; }

main {
  width: min(74rem, 100%);
  margin: auto;
  padding: clamp(1.25rem, 5vw, 4rem);
}

.demo-nav {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  margin-bottom: clamp(2rem, 5vw, 4rem);
}

.demo-nav a {
  border: 1px solid #30435d;
  border-radius: 999px;
  padding: .48rem .72rem;
  color: #91a1b8;
  font: 650 .66rem ui-monospace, monospace;
  letter-spacing: .07em;
  text-decoration: none;
  text-transform: uppercase;
}

.demo-nav a:hover,
.demo-nav a[aria-current="page"] {
  border-color: #8da7c9;
  background: #17243a;
  color: #edf4ff;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 2rem;
  align-items: end;
  margin-bottom: 2rem;
}

.hero h1 {
  max-width: 13ch;
  margin: 0;
  font-size: clamp(2.6rem, 7vw, 5.6rem);
  letter-spacing: -.065em;
  line-height: .9;
}

.hero p {
  max-width: 38rem;
  margin: 1.25rem 0 0;
  color: #a8b4c7;
  line-height: 1.65;
}

.badge {
  border: 1px solid #5d718c;
  border-radius: 999px;
  padding: .55rem .85rem;
  color: #c9ddfa;
  font: 650 .7rem ui-monospace, monospace;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.panel {
  border: 1px solid #28384e;
  border-radius: 1.15rem;
  background: #0e1520e8;
  box-shadow: 0 1.5rem 4rem #0006;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.metric small {
  display: block;
  margin-bottom: .3rem;
  color: #7f8da3;
  font: 650 .64rem ui-monospace, monospace;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.metric output,
.metric strong {
  font: 650 clamp(.92rem, 2vw, 1.18rem) ui-monospace, monospace;
}

.controls {
  display: grid;
  grid-template-columns: minmax(16rem, 1fr) auto;
  gap: 1.25rem;
  align-items: center;
  margin-top: 1.5rem;
  padding: 1.25rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
}

button {
  min-width: 8rem;
  border: 1px solid #50647f;
  border-radius: .72rem;
  padding: .8rem 1rem;
  background: #172236;
  color: #edf4ff;
  font: 700 .76rem ui-monospace, monospace;
  cursor: pointer;
}

button.primary {
  border-color: #ff8585;
  background: #ff6b6b;
  color: #24090d;
}

button:disabled {
  cursor: wait;
  opacity: .55;
}

.status {
  margin: 1rem 0 0;
  color: #8796ab;
  font: .72rem/1.65 ui-monospace, monospace;
}

.error { color: #ff9f9f; }

.progress {
  height: .42rem;
  overflow: hidden;
  border-radius: 999px;
  background: #080c13;
}

.progress > span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #42d6ff, #ff6b9d);
  transition: width .2s ease;
}

@media (max-width: 760px) {
  .hero, .controls { grid-template-columns: 1fr; }
  .metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}