:root{
  --blue: #4a90e2;
  --btn-size: 60px;
  --btns-size:36px;
  --gap: 10px;
}
*{box-sizing:border-box}
body{font-family:Arial,Helvetica,sans-serif;background:#f7f8fb;color:#111;padding:18px}
.container{max-width:980px;margin:0 auto;background:#fff;padding:16px;border-radius:8px;box-shadow:0 6px 18px rgba(0,0,0,0.06)}
h1{font-size:24px;margin:0 0 16px;text-align:center;color:var(--blue)}
.controls-top{display:flex;gap:12px;align-items:center;margin-bottom:0px;padding-bottom:10px;flex-wrap:wrap;justify-content:center;}
.circle-btn{
  width:var(--btn-size);height:var(--btn-size);border-radius:20%;background:var(--blue);
  display:inline-flex;align-items:center;justify-content:center;border:none;color:#fff;cursor:pointer;
  box-shadow:0 2px 4px rgba(0,0,0,0.12);
}
.circle-btn:disabled{opacity:0.5;cursor:not-allowed}
.control-info{font-size:13px;color:#666;margin-left:6px;border-bottom:1px solid #aaa;text-align: center;padding-bottom:10px;}

.track{display:flex;align-items:center;padding:10px 8px;border-bottom:1px solid #aaa;gap:8px;flex-wrap:wrap}
.track:last-child{border-bottom:none}
.order-tag{width:30px;text-align:center;font-size:20px;color:#444;flex:0 0 30px;font-weight:bold;}
.chkbox-wrap{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;flex:0 0 28px}
input.chk-hidden{position:absolute;left:-9999px}
.custom-check{
  width:20px;height:20px;border:2px solid #333;border-radius:3px;display:inline-block;position:relative;background:transparent;
}
.custom-check svg{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);display:none}
input.chk-hidden:checked + .custom-check svg{display:block}
.filename{flex:1;font-size:15px;word-break:break-word;min-width:0}
.track-controls{display:flex;gap:8px;align-items:center;justify-content: center;}
.small-circle{
  width:var(--btns-size);height:var(--btns-size);border-radius:50%;background:var(--blue);
  display:inline-flex;align-items:center;justify-content:center;border:none;color:#fff;cursor:pointer;
  box-shadow:0 2px 4px rgba(0,0,0,0.08);
}
.small-circle:active{transform:translateY(1px)}
.info{font-size:13px;color:#999;border-top:1px solid #aaa;padding-top:10px;padding-left:10%;padding-right:10%;line-height:1.2;}
@media (max-width:640px){
  .track{align-items:flex-start}
  .track-left{display:flex;align-items:center;gap:8px;width:100%}
  .filename{order:3;width:100%;margin-top:6px}
  .track-controls{order:4;width:100%;margin-top:6px;gap:10px}
  .order-tag{order:1}
  .chkbox-wrap{order:2}
}
.track-left{display:flex;align-items:center;gap:8px;min-width:260px;flex:1 1 auto}
.track.playing{background:#eef6ff;border-radius:6px}
.svg-ico{width:14px;height:14px;fill:#fff}
.svg-ico-small{width:14px;height:14px;fill:#fff}
html{ -webkit-text-size-adjust:100%;}