:root {
  color: #f5f7fb;
  background: #10131a;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
}
body {
  margin: 0;
}
main {
  display: grid;
  min-height: 100vh;
  place-items: center;
}
.card {
  background: #171b25;
  border: 1px solid #2a3041;
  border-radius: 24px;
  display: grid;
  gap: 16px;
  max-width: 440px;
  padding: 32px;
  text-align: center;
  width: calc(100vw - 64px);
}
h1,
p {
  margin: 0;
}
p {
  color: #aeb6c8;
}
.volume-control {
  background: linear-gradient(135deg, #20263a, #171b25);
  border: 1px solid #46506b;
  border-radius: 20px;
  display: grid;
  gap: 12px;
  padding: 20px;
  text-align: left;
}
.volume-control span {
  font-size: 20px;
  font-weight: 800;
}
.volume-control input {
  accent-color: #8ef0b0;
  cursor: pointer;
  height: 38px;
  width: 100%;
}
.volume-control output {
  color: #f5f7fb;
  font-size: 30px;
  font-variant-numeric: tabular-nums;
  font-weight: 900;
  text-align: center;
}
audio {
  width: 100%;
}
button {
  background: #7467ff;
  border: 0;
  border-radius: 10px;
  color: white;
  cursor: pointer;
  padding: 12px 16px;
}