/* Colours are taken from Curve's editor: slate canvas, green audio wires. */
:root {
  --page: #20262b;
  --canvas: #363d44;
  --node: #2b3238;
  --line: #4b555e;
  --text: #eef1f3;
  --muted: #aab4bc;
  --wire: #388019;
  --signal: #5cc83c;
  --on-signal: #0d1f07;
  --gutter: 16px;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 24px; }

body {
  margin: 0;
  background: var(--page);
  color: var(--text);
  font: 17px/1.55 var(--sans);
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; height: auto; }
figure { margin: 0; }
h1, h2, h3, p, ul, ol, dl, dd { margin: 0; }

a { color: var(--signal); text-underline-offset: 3px; }
a:hover { color: var(--text); }
:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; border-radius: 3px; }

.top, main, footer {
  width: 100%;
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 20px;
  font-weight: 650;
  text-decoration: none;
}

.top nav { display: flex; flex-wrap: wrap; justify-content: flex-end; align-items: center; gap: 4px 20px; font-size: 15px; }
.top nav a { color: var(--muted); text-decoration: none; }
.top nav a:hover { color: var(--text); }

.languages { position: relative; color: var(--muted); }
.languages summary { cursor: pointer; list-style: none; }
.languages summary::-webkit-details-marker { display: none; }
.languages summary::after { content: " \25BE"; }
.languages summary:hover { color: var(--text); }
.languages ul {
  position: absolute;
  z-index: 10;
  top: calc(100% + 8px);
  right: 0;
  min-width: 130px;
  padding: 6px 0;
  list-style: none;
  background: var(--node);
  border: 1px solid var(--line);
  border-radius: 6px;
}
.languages a { display: block; padding: 4px 14px; }

/* Tight tracking only suits Latin type */
:lang(hi) h1, :lang(ja) h1, :lang(ko) h1, :lang(zh-Hans) h1,
:lang(hi) h2, :lang(ja) h2, :lang(ko) h2, :lang(zh-Hans) h2 { letter-spacing: 0; }

/* Devanagari marks sit above and below the line */
:lang(hi) h1, :lang(hi) h2 { line-height: 1.35; }

.hero { display: grid; gap: 36px; padding-block: 36px 56px; }

h1 {
  font-size: clamp(38px, 6.2vw, 62px);
  line-height: 1.06;
  letter-spacing: -0.025em;
  font-weight: 700;
  text-wrap: balance;
}

.lede { margin-top: 20px; max-width: 34em; color: var(--muted); font-size: 19px; }

.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 22px; margin-top: 28px; }

.button {
  display: inline-block;
  padding: 13px 22px;
  border-radius: 8px;
  background: var(--signal);
  color: var(--on-signal);
  font-weight: 650;
  text-decoration: none;
}
.button:hover { background: #79dc59; color: var(--on-signal); }

.fine { margin-top: 16px; color: var(--muted); font-size: 14.5px; }

figure img { border: 1px solid var(--line); border-radius: 10px; background: var(--canvas); }
figcaption { margin-top: 10px; color: var(--muted); font-size: 14.5px; }

/* The stereo wire that runs through the use cases, like a chain in the editor. */
.signal { position: relative; display: grid; gap: 64px; padding-block: 8px 24px; }

.use { display: grid; gap: 24px; align-items: center; }
.use h2 { margin-bottom: 18px; }
.use p + p, .builtin p + dl { margin-top: 12px; }
.copy > a { display: inline-block; margin-top: 16px; }
.copy p { color: var(--muted); }

.node {
  position: relative;
  display: inline-block;
  padding: 9px 16px;
  border: 1px solid #66717b;
  background: var(--node);
  color: var(--text);
  font-size: 21px;
  line-height: 1.3;
  font-weight: 650;
}

.copy strong { color: var(--text); }
.menu-inline { width: min(100%, 300px); margin-top: 22px; border: 1px solid var(--line); border-radius: 10px; }

.use.wide { grid-template-columns: 1fr; }
.use.wide .copy { max-width: 42em; }

.meters { padding-block: 72px 0; }
.meters > p { margin-top: 12px; max-width: 40em; color: var(--muted); }
.meter-row { display: grid; gap: 20px; margin-top: 26px; }
.meter-row img { background: #15151a; }

.features { padding-block: 72px 0; }
.features h2, .builtin h2, .meters h2, .start h2 {
  font-size: clamp(27px, 4vw, 36px);
  line-height: 1.15;
  letter-spacing: -0.015em;
}

.features ul {
  display: grid;
  gap: 1px;
  margin-top: 28px;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--line);
  list-style: none;
}
.features li { padding: 20px; background: var(--node); }
h3 { font-size: 17px; line-height: 1.3; }
.features li p { margin-top: 6px; color: var(--muted); font-size: 15.5px; }

.builtin { display: grid; gap: 28px; align-items: center; padding-block: 72px 0; }
.builtin h2 { margin-bottom: 14px; }
.builtin figure { justify-self: center; width: min(100%, 340px); }
.builtin figure img { background: #232323; }

dl { display: grid; gap: 8px; margin-top: 18px; font-size: 15.5px; }
dt { font-weight: 650; }
dd { color: var(--muted); }

.start { padding-block: 72px 0; }
.start ol {
  display: grid;
  gap: 18px;
  margin-top: 26px;
  padding: 0;
  list-style: none;
  counter-reset: step;
}
.start li { position: relative; padding-left: 44px; color: var(--muted); counter-increment: step; }
.start li strong { color: var(--text); }
.bar-icon { display: inline-block; width: 18px; height: 18px; vertical-align: -3px; }
.start li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 1px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--wire);
  color: var(--text);
  font-size: 14px;
  font-weight: 650;
  line-height: 28px;
  text-align: center;
}

footer {
  margin-top: 72px;
  padding-block: 28px 44px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14.5px;
}
footer p + p { margin-top: 8px; }

@media (min-width: 620px) {
  :root { --gutter: 28px; }
  .features ul { grid-template-columns: repeat(2, 1fr); }
  dl { grid-template-columns: max-content 1fr; gap: 8px 20px; }
  .start ol { grid-template-columns: repeat(2, 1fr); gap: 22px 32px; }
}

@media (min-width: 940px) {
  .hero { grid-template-columns: 1fr 1.08fr; gap: 56px; align-items: center; padding-block: 56px 88px; }
  .features ul { grid-template-columns: repeat(3, 1fr); }
  .start ol { grid-template-columns: repeat(4, 1fr); }
  .start li { padding: 40px 0 0; }
  .start li::before { top: 0; }

  .signal { gap: 96px; padding-left: 56px; }
  .signal::before, .signal::after {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--wire);
  }
  .signal::before { left: 6px; }
  .signal::after { left: 18px; }

  .node::before, .node::after {
    content: "";
    position: absolute;
    top: 50%;
    height: 2px;
    background: var(--wire);
  }
  .node::before { left: -50px; width: 50px; }
  .node::after { left: -38px; width: 38px; margin-top: 8px; }

  .use { grid-template-columns: 1fr 1.08fr; gap: 56px; }
  .use.wide { grid-template-columns: 1fr; gap: 28px; }
  .meter-row { grid-template-columns: repeat(3, 1fr); }
  .builtin { grid-template-columns: 1.2fr 1fr; gap: 56px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}