:root{
  --primary:#39C5BB;
  --bg:#f0f7f7;
  --surface:#ffffff;
  --text:#1a2423;
  --text-secondary:#546b69;
  --border:#c2e2e0;
  --shadow-normal: 0 4px 14px rgba(14,148,140,0.12);
  --radius:14px;
}
html{
  --dyn-bg:var(--bg);
  --dyn-surface:var(--surface);
  --dyn-text:var(--text);
  --dyn-border:var(--border);
}
[data-theme="dark"]{
  --bg:#121c1b;
  --surface:#1e2d2c;
  --text:#e8f3f2;
  --text-secondary:#92b4b2;
  --border:#2e4442;
  --shadow-normal: 0 4px 16px rgba(0,0,0,0.45);
}
*{
  margin:0;
  padding:0;
  box-sizing:border-box;
}
body{
  font-family:system-ui,sans-serif;
  background:var(--dyn-bg);
  color:var(--dyn-text);
  padding:24px;
  transition: background 0.6s ease, color 0.6s ease;
}
.top-bar{
  max-width:720px;
  margin:0 auto 20px;
  display:flex;
  justify-content:space-between;
  align-items:center;
}
.back-home{
  color:var(--primary);
  text-decoration:none;
  font-size:16px;
}
#theme{
  border:1px solid var(--dyn-border);
  background:var(--dyn-surface);
  color:var(--dyn-text);
  padding:6px 12px;
  border-radius:999px;
  font-size:14px;
  cursor:pointer;
  transition:0.2s;
}
#theme:hover{
  background:var(--primary);
  color:#fff;
  border-color:var(--primary);
}
.container{
  max-width:720px;
  margin:0 auto;
}
.card{
  background:var(--dyn-surface);
  border-radius:var(--radius);
  box-shadow:var(--shadow-normal);
  padding:28px;
  transition:background 0.6s ease,color 0.6s ease;
}
.radio-inner{
  display:flex;
  gap:28px;
  align-items:center;
}
.radio-cover-wrap{
  width:240px;
  height:240px;
  aspect-ratio:1/1;
  flex-shrink:0;
  overflow:hidden;
  border-radius:12px;
  background:var(--dyn-surface);
  display:flex;
  align-items:center;
  justify-content:center;
}
.radio-cover{
  width:100%;
  height:100%;
  object-fit:cover;
  object-position:center;
  display:none;
}
.radio-cover.show{
  display:block;
}
.radio-right{
  flex:1;
  display:flex;
  flex-direction:column;
  justify-content:center;
  gap:16px;
}
.song-info{
  text-align:center;
}
.song-title{
  font-size:22px;
  font-weight:bold;
}
.song-artist{
  font-size:15px;
  color:var(--text-secondary);
  margin-top:4px;
}
.lyric-box{
  height:180px;
  border:1px solid var(--dyn-border);
  background:var(--dyn-surface);
  border-radius:12px;
  padding:12px;
  overflow-y:auto;
}
.control-group{
  display:flex;
  justify-content:center;
  align-items:center;
  gap:14px;
}
.btn-icon{
  width:44px;
  height:44px;
  border:1px solid var(--dyn-border);
  background:var(--dyn-surface);
  color:var(--dyn-text);
  border-radius:999px;
  display:flex;
  align-items:center;
  justify-content:center;
  cursor:pointer;
  transition:0.2s;
}
.btn-icon:hover{
  background:var(--primary);
  color:#fff;
  border-color:var(--primary);
}
.btn-icon:disabled{
  opacity:0.4;
  cursor:not-allowed;
}
.btn-icon svg{
  width:20px;
  height:20px;
}
.like-wrap{
  display:flex;
  align-items:center;
  gap:6px;
}
.like-count-text{
  min-width:36px;
  text-align:center;
}
.lyric-line{
  text-align:center;
  line-height:2;
  font-size:15px;
  color:var(--text-secondary);
}
.lyric-line.active{
  color:var(--primary);
  font-weight:bold;
}
.lyric-empty{
  height:100%;
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--text-secondary);
}
@media (max-width:640px){
  .radio-inner{
    flex-direction:column;
    align-items:center;
  }
  .radio-cover-wrap{
    width:100%;
    max-width:320px;
    height:auto;
    aspect-ratio:1/1;
  }
  .radio-right{
    width:100%;
  }
}