[hidden]{display:none !important}
:root{--bg:#0f1115;--card:#171a21;--line:#262a33;--text:#e9ebf0;--dim:#9aa0ab;--accent:#5fcdf9;--accent2:#ff4d6d;
  font-family:"Segoe UI","PingFang SC","Microsoft YaHei","Noto Sans CJK SC","Noto Sans SC",system-ui,sans-serif}
*{box-sizing:border-box}
html,body{margin:0;background:radial-gradient(1200px 600px at 20% -10%,#2a2016 0,transparent 60%),var(--bg);color:var(--text);min-height:100%}
.top{padding:18px 22px 6px}
.brand{display:flex;gap:14px;align-items:center;max-width:1180px;margin:0 auto}
.logo{font-size:30px;width:52px;height:52px;border-radius:14px;display:grid;place-items:center;background:linear-gradient(135deg,#2a3242,#161a22);border:1px solid var(--line)}
h1{margin:0;font-size:22px;letter-spacing:.5px}
.top p{margin:4px 0 0;color:var(--dim);font-size:13px}
.layout{max-width:1180px;margin:0 auto;padding:14px 22px 40px;display:grid;grid-template-columns:minmax(280px,420px) 1fr;gap:22px;align-items:start}
.preview-col{position:sticky;top:12px;display:flex;flex-direction:column;gap:10px}
.stage{position:relative;border-radius:16px;overflow:hidden;background:#000;border:1px solid var(--line);aspect-ratio:9/16;max-height:78vh;margin:0 auto;width:100%}
.stage canvas{width:100%;height:100%;display:block}
.busy{position:absolute;inset:0;background:rgba(0,0,0,.55);display:flex;gap:10px;align-items:center;justify-content:center;font-size:14px}
.spinner{width:20px;height:20px;border:3px solid #fff4;border-top-color:#fff;border-radius:50%;animation:sp 0.8s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}
.transport{display:flex;align-items:center;gap:10px}
.transport input{flex:1}
.mono{font-variant-numeric:tabular-nums;color:var(--dim);font-size:13px;min-width:44px;text-align:right}
.btn{appearance:none;border:1px solid var(--line);background:#20242d;color:var(--text);padding:9px 14px;border-radius:10px;font-size:14px;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:6px;font-family:inherit}
.btn:hover{background:#282d38}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.primary{background:linear-gradient(180deg,#ff5a78,#e23a5b);border-color:#ff6b86;color:#fff;font-weight:600}
.btn.primary:hover{filter:brightness(1.07)}
.btn.big{padding:14px;font-size:16px;border-radius:12px}
.btn.small{padding:6px 10px;font-size:13px}
.btn.rec{background:#3a1520;border-color:#e23a5b}
.hint{color:var(--dim);font-size:12.5px;line-height:1.55}
.result{display:flex;flex-direction:column;gap:8px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:10px}
.result video{width:100%;max-height:50vh;border-radius:10px;background:#000}
.row{display:flex;gap:8px;align-items:center}
.row.wrap{flex-wrap:wrap}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px 16px 14px;margin-bottom:16px}
.card h2{font-size:16px;margin:0 0 12px;display:flex;align-items:center;gap:8px}
.card h2 small{color:var(--dim);font-weight:400;font-size:12.5px}
.step{width:22px;height:22px;border-radius:50%;background:var(--accent);color:#08212c;display:inline-grid;place-items:center;font-size:13px;font-weight:700}
.drop{display:block;border:1.5px dashed #3a404c;border-radius:14px;padding:18px;text-align:center;cursor:pointer;transition:.15s;background:#12151b}
.drop.over,.drop:hover{border-color:var(--accent);background:#132028}
.drop-icon{font-size:26px;color:var(--accent);line-height:1}
.drop-inner{display:flex;flex-direction:column;gap:6px;align-items:center;font-size:14px}
.thumbs{display:grid;grid-template-columns:repeat(auto-fill,minmax(64px,1fr));gap:6px;margin:12px 0}
.thumb{position:relative;aspect-ratio:1;border-radius:8px;overflow:hidden;background:#222;cursor:grab;border:2px solid transparent;touch-action:none}
.thumb img{width:100%;height:100%;object-fit:cover;display:block;pointer-events:none}
.thumb .idx{position:absolute;left:3px;bottom:3px;font-size:10px;background:#000a;padding:0 4px;border-radius:4px}
.thumb .rm{position:absolute;right:2px;top:2px;width:18px;height:18px;border-radius:50%;border:0;background:#000b;color:#fff;font-size:11px;cursor:pointer;line-height:18px;padding:0}
.thumb.dragging{opacity:.35}
.thumb.target{border-color:var(--accent)}
.field{display:flex;flex-direction:column;gap:6px;margin:10px 0;font-size:13.5px}
.field label{color:#cfd3da}
.field input[type=text],.field input[type=number]{background:#10131a;border:1px solid var(--line);color:var(--text);padding:8px 10px;border-radius:8px;font-size:14px;font-family:inherit}
#noMusicMode{flex-direction:row;align-items:center;gap:14px;flex-wrap:wrap}
.radio{display:flex;gap:5px;align-items:center}
input[type=range]{accent-color:var(--accent);width:100%}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:0 14px}
.grid3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:0 12px}
.switch{display:flex;gap:8px;align-items:center;font-size:14px;margin:8px 0 2px;cursor:pointer}
.switch input{width:18px;height:18px;accent-color:var(--accent)}
.file-btn{position:relative}
.foot{color:var(--dim);font-size:12px;line-height:1.6}
@media (max-width:820px){
  .layout{grid-template-columns:minmax(0,1fr);padding:10px 12px 30px;gap:14px}
  .preview-col{position:static}
  .stage{max-height:62vh;width:auto;height:62vh}
  .top{padding:12px 14px 0}
  h1{font-size:19px}
  .grid3{grid-template-columns:1fr 1fr 1fr}
}
@media (max-width:420px){.grid2{grid-template-columns:1fr}}
.export-mode{display:flex;flex-direction:column;gap:4px}
.export-mode select{width:100%;background:#10131a;color:var(--text);border:1px solid var(--line);border-radius:8px;padding:7px;font-size:13px;font-family:inherit;max-width:100%}
.preview-col,.panel-col{min-width:0}
html,body{overflow-x:hidden}
.credit{margin-top:8px}.credit a{color:inherit;text-decoration:underline}

.bpm-box{margin-top:12px;background:#12151b;border:1px solid var(--line);border-radius:12px;padding:10px 12px}
.bpm-head{display:flex;align-items:center;gap:10px;margin-bottom:6px}
.bpm-num{font-size:14px;color:#cfd3da}
.bpm-num b{font-size:22px;color:var(--text);font-variant-numeric:tabular-nums;letter-spacing:.3px}
.bpm-status{color:var(--dim);font-size:12.5px;display:inline-flex;align-items:center;gap:6px;margin-left:auto}
.bpm-status .spinner{width:13px;height:13px;border-width:2px}
.bpm-tools{margin-top:6px}
.bpm-tools kbd{font-family:inherit;font-size:11px;border:1px solid #3a404c;border-bottom-width:2px;border-radius:4px;padding:0 4px;color:var(--dim)}
#tapBtn.tap{background:#1d3340;border-color:var(--accent)}
.beat-dot{width:12px;height:12px;border-radius:50%;background:var(--accent);opacity:.25;flex:none;will-change:transform,opacity}
.beat-dot.small{width:9px;height:9px}