:root {
  color-scheme: light;
  font-family: Inter, "Hiragino Sans", "Yu Gothic UI", Meiryo, sans-serif;
  color: #16213c;
  background: #f1f5ff;
  line-height: 1.6;
  --accent: #2446b9;
  --muted: #4c5c7b;
  --border: #d7e0f5;
}

*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; }
h1, h2, p { margin: 0; }
a { color: var(--accent); text-underline-offset: .22em; }
a:focus-visible, summary:focus-visible, audio:focus-visible { outline: 3px solid #5877e6; outline-offset: 4px; }
.wrap { width: min(100% - 2rem, 62rem); margin-inline: auto; }
.hero { background: #e6edff; border-bottom: 1px solid #d3defa; }
.hero-inner { display: flex; align-items: center; justify-content: space-between; gap: 2rem; padding-block: clamp(2rem, 6vw, 4.5rem); }
h1 { font-size: clamp(1.85rem, 5.4vw, 3.5rem); line-height: 1.2; letter-spacing: .025em; }
.hero p { margin-top: .8rem; color: var(--muted); }
.wave { display: flex; align-items: center; gap: clamp(.25rem, .8vw, .75rem); padding-right: 1.5rem; }
.wave span { display: block; width: clamp(.26rem, .8vw, .6rem); height: 1.6rem; border-radius: 1rem; background: #7690e8; }
.wave span:nth-child(2n) { height: 3rem; }
.wave span:nth-child(3n) { height: 4.3rem; }
.wave span:nth-child(5) { height: 6rem; background: #3155cc; }
.sets { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: start; gap: 1.25rem; padding-block: 1.65rem 3rem; }
.set { background: #fff; border: 1px solid var(--border); border-radius: 1.15rem; padding: clamp(1.15rem, 3vw, 1.9rem); box-shadow: 0 8px 26px #314f9510; }
.set-heading h2 { font-size: clamp(1.25rem, 3vw, 1.55rem); }
.set-heading h2 span { color: var(--accent); font-variant-numeric: tabular-nums; }
.set-heading p { color: var(--muted); font-size: .9rem; margin-top: .25rem; }
.set-heading p span { margin-inline: .3rem; }
.player { margin-block: 1.1rem; }
audio { display: block; width: 100%; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: .55rem 1rem; }
.actions a { min-height: 2.75rem; display: inline-flex; align-items: center; gap: .6rem; font-weight: 650; font-size: .92rem; }
.primary { background: var(--accent); color: #fff; border-radius: .55rem; padding-inline: .85rem; text-decoration: none; }
.primary:hover { background: #183493; }
.download { padding-inline: .2rem; }
details { border-top: 1px solid var(--border); margin-top: 1.2rem; padding-top: .6rem; }
summary { cursor: pointer; color: #364563; font-size: .9rem; min-height: 2.5rem; padding-block: .5rem; }
details a { display: inline-block; padding-block: .3rem .6rem; font-size: .9rem; }
@media (max-width: 42rem) {
  .sets { grid-template-columns: minmax(0, 1fr); gap: .9rem; }
  .hero-inner { gap: .5rem; }
  .wave { display: none; }
}