:root{
  --bg: #0b0b0b;
  --card: rgba(255,255,255,.06);
  --card2: rgba(255,255,255,.03);
  --text: #f3f3f3;
  --muted: rgba(255,255,255,.65);
  --btn: #ffffff;
  --btnText: #0b0b0b;
}

*{ box-sizing:border-box; }

body{
  margin:0;
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  background: radial-gradient(1200px 800px at 50% -10%, rgba(255,255,255,.08), transparent 55%),
              linear-gradient(180deg, #050505, var(--bg));
  color:var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  padding: 18px;
}

.player{
  width: min(420px, 100%);
  border:1px solid rgba(255,255,255,.10);
  background: var(--card);
  border-radius: 18px;
  padding: 18px;
  box-shadow: 0 16px 60px rgba(0,0,0,.55);
  backdrop-filter: blur(10px);
}

.cover{
  width:100%;
  aspect-ratio: 1 / 1;
  border-radius: 14px;
  object-fit: cover;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(0,0,0,.25);
}

.title{
  margin: 14px 0 4px;
  font-size: 22px;
  letter-spacing: .3px;
}

.artist{
  margin: 0 0 12px;
  font-size: 13px;
  color: var(--muted);
}

.track{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap: 10px;
  padding: 10px 10px;
  border-radius: 14px;
  border:1px solid rgba(255,255,255,.08);
  background: var(--card2);
}

.track span{
  font-size:14px;
  color:#e7e7e7;
}

#playBtn{
  appearance:none;
  border:0;
  padding:10px 12px;
  border-radius:12px;
  background:var(--btn);
  color:var(--btnText);
  font-weight:800;
  cursor:pointer;
}

#playBtn:disabled{
  opacity:.55;
  cursor:not-allowed;
}

.controls{
  margin-top:12px;
  border:1px solid rgba(255,255,255,.08);
  border-radius:14px;
  padding:12px;
  background: rgba(255,255,255,.03);
}

.controls-row{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  margin-bottom:10px;
  flex-wrap:wrap; /* スマホで崩れないように */
}

.iconBtn{
  appearance:none;
  border:1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.06);
  color: var(--text);
  border-radius:12px;
  padding:10px 14px;
  font-size:16px;
  cursor:pointer;
  min-width:54px;  /* 押しやすさ */
  min-height:44px; /* iPhone推奨タップサイズ */
}

.iconBtn--main{
  background: var(--btn);
  color: var(--btnText);
  border:0;
  font-weight:900;
  min-width:70px;
}

.iconBtn--mode{
  font-size:13px;
  letter-spacing:.2px;
  padding:10px 12px;
  min-width:92px;
}

.iconBtn:active{
  transform: translateY(1px);
}

.seek{
  display:grid;
  grid-template-columns: auto 1fr auto;
  gap:10px;
  align-items:center;
}

.time{
  font-size:12px;
  color: var(--muted);
  width:44px;
  text-align:center;
}

.mono{
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

#seekBar{
  width:100%;
  accent-color: #ffffff;
}

.hint{
  margin:10px 2px 0;
  font-size:12px;
  color:var(--muted);
  min-height:16px;
}

.tracklist{
  margin-top:10px;
  display:flex;
  flex-direction:column;
  gap:8px;
}

.trackItem{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:10px;
  padding:10px 10px;
  border-radius:12px;
  border:1px solid rgba(255,255,255,.08);
  background: rgba(0,0,0,.15);
  cursor:pointer;
}

.trackItem .name{
  font-size:13px;
  color:#e7e7e7;
}

.trackItem .tag{
  font-size:12px;
  color: var(--muted);
}

.trackItem.active{
  border-color: rgba(255,255,255,.22);
  background: rgba(255,255,255,.06);
}

@media (max-width: 380px){
  body{ padding: 12px; }
  .player{ padding:14px; }
  .iconBtn{ min-width:50px; padding:10px 12px; }
  .iconBtn--main{ min-width:64px; }
  .iconBtn--mode{ min-width:88px; }
}