.bgma-stage{
  max-width: 720px;
  margin: 14px auto 0;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.bgma-stage input[type="file"]{ display: none; }

.upload-box{
  display: flex;
  justify-content: center;
}
.upload-box label{
  width: 100%;
  min-height: 110px;
  border-radius: 8px;
  border: 3px dashed #9da0d9;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: #fff;
  transition: border-color 0.15s, background 0.15s;
  padding: 16px;
}
.upload-box label:hover{
  border-style: solid;
  background: #f8f9ff;
}
.upload-box .upload-hint{
  font-size: 14px;
  color: var(--muted);
  margin: 0;
}

.info-card{
  background: #fff;
  border: 1px solid #eef0fa;
  border-radius: 8px;
  padding: 12px 14px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.media-icon{
  width: 44px;
  height: 44px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: #fff;
  flex-shrink: 0;
  background: linear-gradient(135deg, #4449a6, #5a60c4);
}
.media-body{
  flex: 1;
  min-width: 0;
}
.file-name{
  font-size: 14px;
  font-weight: 600;
  color: #262626;
  word-break: break-all;
}
.file-sub{
  font-size: 12px;
  color: var(--muted);
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  margin-top: 2px;
}
.remove-btn{
  background: #fff;
  border: 1px solid #e5e7f0;
  color: #b00d44;
  width: 28px;
  height: 28px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.remove-btn:hover{
  background: #fff5f7;
  border-color: #f5c5d3;
}

.audio-section{
  background: #fff;
  border: 1px solid #eef0fa;
  border-radius: 8px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.audio-section input[type="file"]{ display: none; }
.section-title{
  font-size: 11px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.6px;
  text-transform: uppercase;
  margin: 0 0 8px;
}
.music-chips{
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.music-chip{ cursor: pointer; }
.music-chip input[type="radio"]{
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.music-chip span{
  display: inline-block;
  padding: 7px 14px;
  background: #fff;
  border: 1px solid #e5e7f0;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  color: #555;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  user-select: none;
}
.music-chip:hover span{ border-color: var(--pcolor); color: var(--pcolor); }
.music-chip input[type="radio"]:checked + span{
  background: var(--pcolor);
  border-color: var(--pcolor);
  color: #fff;
  font-weight: 600;
}
.music-pick-btn{
  display: block;
  padding: 9px 14px;
  background: #fff;
  border: 1px dashed #c9cee5;
  border-radius: 4px;
  font-size: 14px;
  color: var(--pcolor);
  text-align: center;
  cursor: pointer;
  font-weight: 500;
}
.music-pick-btn:hover{ border-style: solid; border-color: var(--pcolor); }
.preview-row{
  display: flex;
  gap: 10px;
  align-items: center;
  background: #f8f9ff;
  border-radius: 4px;
  padding: 7px 12px;
}
.preview-btn{
  background: var(--pcolor);
  color: #fff;
  border: none;
  padding: 6px 14px;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  min-width: 70px;
}
.preview-btn:hover{ background: #373c8f; }
.preview-btn.playing{ background: #d31b5a; }
.preview-track{
  flex: 1;
  font-size: 13px;
  font-weight: 600;
  color: var(--pcolor);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}
.preview-time{
  font-size: 12px;
  color: var(--muted);
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  white-space: nowrap;
}
.music-credit{
  font-size: 11px;
  color: var(--muted);
  margin: 0;
  line-height: 1.4;
}
.music-credit a{ color: var(--pcolor); }

.settings-card{
  background: #fff;
  border: 1px solid #eef0fa;
  border-radius: 8px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.vol-row{
  display: flex;
  align-items: center;
  gap: 12px;
}
.vol-row .vol-label{
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  min-width: 110px;
}
.vol-row input[type="range"]{
  flex: 1;
  accent-color: var(--pcolor);
}
.vol-row .vol-val{
  font-size: 13px;
  font-weight: 600;
  color: var(--pcolor);
  min-width: 44px;
  text-align: right;
  font-family: ui-monospace, monospace;
}

.format-row{
  display: flex;
  align-items: center;
  gap: 12px;
}
.format-row .vol-label{
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  min-width: 110px;
}
.format-row select{
  flex: 1;
  padding: 8px 12px;
  font-size: 13px;
  border: 1px solid #e5e7f0;
  border-radius: 4px;
  background: #fff;
  outline: none;
  cursor: pointer;
}

.loop-toggle{
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-size: 13px;
  color: #555;
  padding: 4px 0;
  user-select: none;
}
.loop-toggle:hover{ color: var(--pcolor); }
.loop-toggle input[type="checkbox"]{
  accent-color: var(--pcolor);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.advanced{
  border: 1px solid #eef0fa;
  border-radius: 6px;
  background: #fff;
}
.advanced summary{
  cursor: pointer;
  padding: 9px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--pcolor);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.advanced summary::after{
  content: '+';
  font-size: 16px;
  transition: transform 0.2s;
}
.advanced[open] summary::after{ transform: rotate(45deg); }
.advanced[open] summary{ border-bottom: 1px solid #eef0fa; }
.adv-body{
  padding: 12px 14px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.adv-field{ flex: 1 1 140px; }
.adv-field label{
  display: block;
  font-size: 11px;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.4px;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.adv-field input{
  width: 100%;
  padding: 7px 10px;
  font-size: 13px;
  border: 1px solid #e5e7f0;
  border-radius: 4px;
  outline: none;
  box-sizing: border-box;
  background: #fff;
}

.process-btn{
  background: linear-gradient(135deg, #4449a6, #373c8f);
  color: #fff;
  border: none;
  padding: 14px 26px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  display: block;
  width: 100%;
  box-shadow: 0 6px 18px rgba(68, 73, 166, 0.30);
  transition: transform 0.15s, box-shadow 0.15s;
}
.process-btn:hover:not(:disabled){
  transform: translateY(-1px);
  box-shadow: 0 10px 26px rgba(68, 73, 166, 0.42);
}
.process-btn:disabled{
  opacity: 0.6;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

.processing{
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 16px;
  background: #fff;
  border-radius: 8px;
  border: 1px solid #eef0fa;
  color: var(--pcolor);
  font-size: 14px;
}
.proc-spin{
  width: 22px;
  height: 22px;
  border: 3px solid var(--pcolor);
  border-top-color: rgba(255,255,255,0.3);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin{ to { transform: rotate(360deg); } }

.result-card{
  background: #fff;
  border: 1px solid #eef0fa;
  border-radius: 8px;
  padding: 14px;
  position: relative;
  overflow: hidden;
}
.result-card::before{
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #4449a6, #d31b5a);
}
.result-card audio{
  width: 100%;
  margin-bottom: 12px;
}
.result-meta{
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--muted);
  font-weight: 600;
  padding: 8px 12px;
  background: #f8f9ff;
  border-radius: 6px;
  justify-content: center;
  margin-bottom: 12px;
}
.result-actions{
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.result-actions a, .result-actions button{
  flex: 1 1 130px;
  padding: 10px 16px;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  border: none;
}
.result-actions .download-btn{
  background: var(--pcolor);
  color: #fff;
}
.result-actions .download-btn:hover{ background: #373c8f; }
.result-actions .ctrl-btn{
  background: #fff;
  color: var(--pcolor);
  border: 1px solid #e5e7f0;
}
.result-actions .ctrl-btn:hover{ border-color: var(--pcolor); }

.illus{
  margin: 24px 0 56px;
  display: flex;
  justify-content: center;
}
.illus img{
  max-width: 100%;
  height: auto;
  border-radius: 16px;
  box-shadow: 0 14px 40px rgba(68, 73, 166, 0.14);
}
.last-updated{
  display: block;
  font-size: 12px;
  color: var(--muted);
  text-align: right;
  margin: -8px 0 14px;
}

@media screen and (max-width: 600px){
  .vol-row{ flex-wrap: wrap; }
  .vol-row .vol-label{ flex-basis: 100%; min-width: 0; }
  .format-row{ flex-wrap: wrap; }
  .format-row .vol-label{ flex-basis: 100%; min-width: 0; }
}