:root { --up:#1a7f37; --ok:#9a6700; --down:#cf222e; }
* { box-sizing: border-box; }
body {
  font: 16px/1.5 system-ui, sans-serif;
  margin: 0; background: #f6f7f9; color: #1b1f24;
}
main { max-width: 640px; margin: 0 auto; padding: 1.25rem; }
h1 { font-size: 1.5rem; }
.legend { list-style: none; padding: 0; }
.legend li { margin: .35rem 0; }
.pill { display: inline-block; padding: .1rem .5rem; border-radius: 1rem;
  font-weight: 600; color: #fff; }
.pill.up { background: var(--up); } .pill.ok { background: var(--ok); }
.pill.down { background: var(--down); }

button.primary {
  font-size: 1.1rem; padding: .7rem 1.4rem; border: 0; border-radius: .6rem;
  background: #0969da; color: #fff; cursor: pointer; margin-top: 1rem;
}
button.primary:active { transform: translateY(1px); }

.progress { font-weight: 600; color: #57606a; margin-bottom: .5rem; }
audio { width: 100%; margin: .5rem 0; }
.hint { color: #57606a; font-size: .9rem; margin: .25rem 0 1rem; }

.seg {
  display: flex; align-items: center; gap: .5rem;
  padding: .35rem .4rem; border-radius: .5rem; margin: .25rem 0;
  border: 1px solid #e2e4e8; background: #fff;
}
.seg.playing { border-color: #0969da; background: #eef5ff; }
.seglab {
  flex: 1; text-align: left; background: none; border: 0;
  font: inherit; color: #24292f; cursor: pointer; padding: .3rem .2rem;
}
.btns { display: flex; gap: .3rem; }
.rate {
  font-size: 1.4rem; line-height: 1; padding: .35rem .5rem;
  border: 2px solid transparent; border-radius: .5rem;
  background: #f0f1f3; cursor: pointer;
}
.rate.sel.up { border-color: var(--up); background: #e6f4ea; }
.rate.sel.ok { border-color: var(--ok); background: #fbf3e0; }
.rate.sel.down { border-color: var(--down); background: #fbe9ea; }