:root{
  --bg-0:#0a0714;
  --bg-1:#120b24;
  --panel:#180f30;
  --panel-2:#1e1440;
  --line:#2d2154;
  --ink:#f3efff;
  --ink-dim:#b6aed6;
  --ink-faint:#8478a8;
  --purple:#6238d4;
  --purple-2:#8a5fe0;
  --gold:#e0b256;
  --gold-2:#9a711c;
  --danger:#ef6a5d;
  --radius-lg:24px;
  --radius-md:16px;
  --radius-sm:10px;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  background:radial-gradient(circle at 20% -10%, #241a45 0%, var(--bg-0) 55%);
  color:var(--ink);
  min-height:100vh;
  padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}
#app{max-width:640px;margin:0 auto;padding:20px 18px 60px;}
header{text-align:center;margin-bottom:22px;}
header h1{
  font-size:26px;margin:0 0 6px;letter-spacing:.2px;
  background:linear-gradient(90deg,var(--gold),var(--purple-2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
header p{margin:0;color:var(--ink-dim);font-size:14px;line-height:1.5;}
.screen{display:flex;flex-direction:column;gap:16px;}
.screen[hidden]{display:none;}
.card{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  padding:22px;
}
.dropzone{
  border:2px dashed var(--line);
  border-radius:var(--radius-lg);
  padding:38px 20px;
  text-align:center;
  cursor:pointer;
  transition:border-color .15s, background .15s;
}
.dropzone.drag{border-color:var(--purple-2);background:var(--panel-2);}
.dropzone .icon{font-size:40px;margin-bottom:10px;}
.dropzone .primary{font-weight:600;font-size:16px;margin-bottom:6px;}
.dropzone .secondary{color:var(--ink-faint);font-size:13px;}
input[type=file]{display:none;}
.source-tabs{display:flex;gap:8px;margin-bottom:18px;}
.source-tab{
  flex:1;appearance:none;background:var(--panel-2);border:1px solid var(--line);color:var(--ink-dim);
  border-radius:999px;padding:10px 14px;font-size:14px;font-weight:600;cursor:pointer;
}
.source-tab.active{background:linear-gradient(90deg,var(--purple),var(--purple-2));color:#fff;border-color:transparent;}
input[type=text]{
  background:var(--panel-2);color:var(--ink);border:1px solid var(--line);
  border-radius:var(--radius-sm);padding:11px 14px;font-size:14px;width:100%;min-width:0;
}
input[type=text]::placeholder{color:var(--ink-faint);}
.yt-search-row, .yt-url-row{display:flex;gap:8px;margin-bottom:10px;}
.yt-search-row input, .yt-url-row input{flex:1;}
.yt-embed-wrap{position:relative;width:100%;aspect-ratio:16/9;border-radius:var(--radius-md);overflow:hidden;background:#000;margin:14px 0;}
.yt-embed-wrap iframe{position:absolute;inset:0;width:100%;height:100%;border:0;}
.btn{
  appearance:none;border:none;border-radius:999px;
  padding:14px 22px;font-size:15px;font-weight:600;cursor:pointer;
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  transition:transform .1s, opacity .15s;
}
.btn:active{transform:scale(.97);}
.btn-primary{background:linear-gradient(90deg,var(--purple),var(--purple-2));color:#fff;}
.btn-secondary{background:var(--panel-2);color:var(--ink);border:1px solid var(--line);}
.btn-ghost{background:transparent;color:var(--ink-dim);}
.btn[disabled]{opacity:.5;cursor:not-allowed;}
.btn-row{display:flex;gap:10px;flex-wrap:wrap;}
.notice{
  background:rgba(224,178,86,0.1);border:1px solid rgba(224,178,86,0.35);
  color:var(--gold);border-radius:var(--radius-md);padding:12px 14px;font-size:13px;line-height:1.5;
}
.info-list{color:var(--ink-faint);font-size:12.5px;line-height:1.6;margin-top:14px;padding-left:18px;}
.progress-wrap{background:var(--panel-2);border-radius:999px;height:10px;overflow:hidden;}
.progress-bar{height:100%;background:linear-gradient(90deg,var(--purple),var(--gold));width:0%;transition:width .2s;}
#analyzingStatus{color:var(--ink-dim);font-size:14px;text-align:center;}
.key-capo-row{display:flex;gap:14px;flex-wrap:wrap;}
.pill-stat{
  flex:1;min-width:140px;background:var(--panel-2);border:1px solid var(--line);
  border-radius:var(--radius-md);padding:14px 16px;
}
.pill-stat .label{font-size:11px;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-faint);}
.pill-stat .value{font-size:22px;font-weight:700;margin-top:4px;}
select{
  background:var(--panel);color:var(--ink);border:1px solid var(--line);
  border-radius:var(--radius-sm);padding:6px 10px;font-size:14px;margin-top:6px;
}
#capoNote{color:var(--ink-dim);font-size:13px;margin-top:10px;line-height:1.5;}
.chip-row{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px;}
.chip{
  background:var(--panel-2);border:1px solid var(--line);border-radius:999px;
  padding:5px 12px;font-size:13px;font-weight:600;color:var(--ink);
}
canvas#renderCanvasMerged, video#doneVideoMerged, canvas#practiceCanvas{
  width:100%;max-width:340px;aspect-ratio:9/16;border-radius:var(--radius-md);
  background:#000;display:block;margin:0 auto;border:1px solid var(--line);
}
.toggle-row{
  display:flex;align-items:center;justify-content:center;gap:8px;
  margin-top:16px;font-size:13px;color:var(--ink-dim);cursor:pointer;
}
.toggle-row input{width:18px;height:18px;accent-color:var(--purple-2);cursor:pointer;}
.separate-row{display:flex;gap:14px;flex-wrap:wrap;justify-content:center;margin-top:12px;}
.separate-item{flex:1;min-width:150px;max-width:220px;}
.separate-item video{
  width:100%;aspect-ratio:9/16;border-radius:var(--radius-sm);
  background:#000;display:block;border:1px solid var(--line);
}
.separate-label{font-size:13px;font-weight:600;text-align:center;margin:8px 0 6px;color:var(--ink-dim);}
h2{font-size:17px;margin:0 0 4px;}
.muted{color:var(--ink-faint);font-size:13px;}
footer{text-align:center;color:var(--ink-faint);font-size:12px;margin-top:28px;line-height:1.6;}