:root{
  --blue:#4c84ff;--cyan:#24c7d9;--purple:#866cff;--ink:#17304e;--muted:#718399;
  --line:rgba(38,79,126,.14);--panel:rgba(255,255,255,.95);--danger:#ff5c72;
}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--ink);
  background:
    radial-gradient(circle at 10% 0,rgba(111,199,255,.30),transparent 30%),
    radial-gradient(circle at 90% 8%,rgba(255,139,178,.20),transparent 28%),
    #f3f7ff;
}
button,input,select{font:inherit}
button{cursor:pointer}
.hidden{display:none!important}
.studio-shell{width:min(1500px,calc(100% - 28px));margin:auto;padding-bottom:30px}
.studio-header{min-height:82px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.studio-header small{color:#245ea8;font-weight:900;letter-spacing:.08em}
.studio-header h1{margin:4px 0 0;font-size:28px}
.studio-header a{text-decoration:none;color:#fff;background:linear-gradient(135deg,var(--blue),var(--purple));padding:11px 16px;border-radius:8px;font-weight:900}
.studio-grid{display:grid;grid-template-columns:300px minmax(500px,1fr) 430px;gap:16px;align-items:start}
.panel{background:var(--panel);border:1px solid rgba(255,255,255,.9);border-radius:8px;padding:18px;box-shadow:0 20px 55px rgba(43,72,112,.12)}
.panel h2{margin:0 0 14px}
.controls label{display:grid;gap:6px;margin-bottom:12px;font-size:13px;font-weight:800}
.controls input,.controls select,.transport select,.editor-head select{
  width:100%;min-height:42px;border:1px solid var(--line);border-radius:8px;background:#fff;padding:8px 10px;color:var(--ink)
}
.controls small{color:var(--muted);font-weight:500}
.upload{min-height:72px;border:1.5px dashed rgba(76,132,255,.45);border-radius:8px;place-items:center;padding:10px;text-align:center;background:#f7f9ff}
.chart-upload{background:#fff9ef;border-color:rgba(255,166,71,.5)}
.upload input{display:none}
.upload b{color:var(--blue)}
.two{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.field-row{display:grid;grid-template-columns:1fr auto;gap:8px;align-items:end}
.bpm-factor-tools{display:flex;gap:6px;padding-bottom:12px}
.bpm-factor-tools button{min-width:48px;min-height:42px;border:1px solid rgba(76,132,255,.28);background:#fff;border-radius:8px;color:#245ea8;font-weight:900}
.bpm-tools{display:grid;gap:7px;margin:-4px 0 12px}
.bpm-tools span{font-size:12px;color:var(--muted)}
.filename-preview{background:#edf4ff;border-radius:8px;padding:10px;margin-bottom:12px}
.filename-preview small,.filename-preview b{display:block;overflow-wrap:anywhere}
.filename-preview small{color:var(--muted)}
.controls>button,.actions button,.editor-toolbar button,.editor-scroll button,.transport button{
  min-height:42px;border:0;border-radius:8px;padding:9px 13px;font-weight:900
}
.soft{background:#eaf1ff;color:#245ea8;margin-bottom:8px}
.danger{background:#fff0f2;color:var(--danger);width:100%}
.transport{display:flex;align-items:center;gap:9px;flex-wrap:wrap}
.transport .primary,.export{background:linear-gradient(135deg,var(--blue),var(--purple));color:#fff}
.transport span{margin-right:auto;font-variant-numeric:tabular-nums}
.transport label{display:flex;align-items:center;gap:6px;font-size:12px}
.seek{width:100%;margin:14px 0}
.record-help{background:#eef5ff;border-radius:11px;padding:10px;margin-bottom:12px;color:#45627f}
.lane-board{position:relative;height:360px;border-radius:16px;overflow:hidden;background:linear-gradient(180deg,#081328,#182d4f 58%,#071222)}
.lane-board:before{content:"";position:absolute;inset:0;background:repeating-linear-gradient(0deg,transparent 0 44px,rgba(255,255,255,.045) 45px)}
.lane{position:absolute;top:0;bottom:0;width:25%;border-right:1px solid rgba(255,255,255,.11)}
.lane:nth-of-type(1){left:0}.lane:nth-of-type(2){left:25%}.lane:nth-of-type(3){left:50%}.lane:nth-of-type(4){left:75%}
.lane span{position:absolute;top:10px;left:10px;color:rgba(255,255,255,.5);font-weight:900}
.playhead{position:absolute;z-index:5;left:0;right:0;bottom:52px;height:4px;background:linear-gradient(90deg,transparent,#76f0ff 10%,white 50%,#ffd38a 90%,transparent)}
.markers{position:absolute;inset:0}
.marker{position:absolute;width:calc(25% - 8px);height:14px;margin-left:4px;border-radius:6px;background:#b9d4ff;box-shadow:0 0 15px #75a6ff}
.marker.hold{height:var(--h);min-height:24px;background:linear-gradient(#fff,#7ca9ff)}
.record-keys{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:10px}
.record-keys button{min-height:66px;border:1px solid var(--line);background:#fff;border-radius:12px;color:var(--ink)}
.record-keys b,.record-keys small{display:block}
.record-keys b{font-size:22px}
.record-keys small{color:var(--muted)}
.record-keys button.active{background:#dce8ff;transform:scale(.98)}
.summary{display:flex;gap:15px;flex-wrap:wrap;margin:12px 0;color:var(--muted)}
.summary b{color:var(--ink)}
.actions{display:flex;gap:10px}
.actions .export{margin-left:auto}
.notice{min-height:38px;margin-top:12px;padding:10px;border-radius:10px;background:#f4f7fc;color:#45627f}
.editor-panel{position:sticky;top:12px}
.editor-head{display:flex;align-items:end;justify-content:space-between;gap:12px}
.editor-head small{color:var(--blue);font-weight:900}
.editor-head h2{margin:3px 0 0}
.editor-head label{font-size:12px;color:var(--muted)}
.editor-tip{font-size:12px;color:var(--muted);line-height:1.55}
.editor-toolbar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:10px}
.editor-toolbar button{background:#eaf1ff;color:#245ea8}
.editor-toolbar span{margin-left:auto;font-size:12px;color:var(--muted)}
.editor-scroll{display:grid;grid-template-columns:42px 1fr 42px;gap:8px;align-items:center;margin-bottom:10px}
.editor-scroll button{background:#eaf1ff;color:#245ea8}
.editor-scroll label{display:grid;gap:4px;color:var(--muted);font-size:12px;font-weight:800}
.editor-scroll input{width:100%;accent-color:#4c84ff}
.chart-editor{
  --beat-px:44px;
  position:relative;height:600px;overflow:hidden;border-radius:16px;
  background:
    repeating-linear-gradient(to bottom,rgba(255,255,255,.075) 0 1px,transparent 1px var(--beat-px)),
    linear-gradient(180deg,#09152a,#172d50);
  outline:none;touch-action:none
}
.editor-grid-lines{position:absolute;inset:0;background:linear-gradient(90deg,transparent 24.8%,rgba(255,255,255,.13) 25%,transparent 25.2%,transparent 49.8%,rgba(255,255,255,.13) 50%,transparent 50.2%,transparent 74.8%,rgba(255,255,255,.13) 75%,transparent 75.2%)}
.editor-playhead{position:absolute;z-index:4;left:0;right:0;top:50%;height:3px;background:#fff;box-shadow:0 0 18px #76f0ff}
.editor-lanes{position:absolute;z-index:3;left:0;right:0;top:8px;display:grid;grid-template-columns:repeat(4,1fr);pointer-events:none}
.editor-lanes i{text-align:center;color:rgba(255,255,255,.48);font-style:normal;font-weight:900}
.editor-notes{position:absolute;inset:0}
.editor-note{position:absolute;z-index:6;min-height:13px;border:0;border-radius:6px;background:#a9caff;box-shadow:0 0 12px #6c9bff;transform:translateY(-50%);cursor:grab}
.editor-note.hold{transform:none;background:linear-gradient(#fff,#799fff)}
.editor-note.selected{outline:3px solid #ffd66e;box-shadow:0 0 22px #ffd66e}
.editor-footer{display:flex;justify-content:space-between;gap:10px;margin-top:10px;font-size:12px;color:var(--muted)}
@media(max-width:1180px){.studio-grid{grid-template-columns:280px 1fr}.editor-panel{grid-column:1/-1;position:static}.chart-editor{height:440px}}
@media(max-width:760px){.studio-grid{grid-template-columns:1fr}.two{grid-template-columns:1fr}.studio-header{align-items:flex-start}.transport span{width:100%;order:3}.chart-editor{height:380px}}