:root{
  --bg:#0d0a24; --bg-2:#151036; --panel:#1a1440; --surface:rgba(255,255,255,.06); --surface-2:rgba(255,255,255,.1);
  --text:#f5f0ff; --muted:#a79fca; --line:rgba(255,255,255,.13);
  --gold:#ffc857; --shu:#ff6a3d; --asagi:#3fd8cf; --momo:#ff5fa8;
  --display:"Dela Gothic One","Hiragino Kaku Gothic StdN","Hiragino Sans","Noto Sans JP",system-ui,sans-serif;
  --body:"Zen Kaku Gothic New","Hiragino Kaku Gothic ProN","Hiragino Sans","Noto Sans JP","Yu Gothic",system-ui,sans-serif;
  color-scheme:dark;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;background:var(--bg);color:var(--text);font-family:var(--body);font-size:13px}
body{display:flex;flex-direction:column;overflow:hidden}
button,select,input{font:inherit;color:inherit}
button{background:var(--surface-2);border:1px solid var(--line);border-radius:9px;padding:6px 11px;cursor:pointer;font-weight:700;white-space:nowrap}
button:hover{background:rgba(255,255,255,.16)}
button:disabled{opacity:.4;cursor:default}
button.accent{background:linear-gradient(100deg,#ff8a2a,#ff4f7e);border:0;color:#fff}
button.play{background:linear-gradient(100deg,#1fb9a4,#3a9ee8);border:0;color:#fff}
button.danger{color:#ff7b80}
button.wide{width:100%}
button.grow{flex:1}
button:focus-visible,select:focus-visible,input:focus-visible{outline:2px solid var(--gold);outline-offset:1px}
select,input[type=text],input[type=number]{background:rgba(0,0,0,.25);border:1px solid var(--line);border-radius:8px;padding:6px 8px;min-width:0}
input[type=color]{width:100%;height:32px;border:1px solid var(--line);border-radius:8px;background:none;padding:2px}
input[type=range]{accent-color:var(--shu)}
kbd{font-family:var(--body);font-size:11px;font-weight:700;padding:1px 6px;border-radius:6px;border:1px solid var(--line);background:var(--surface-2)}

.bar{display:flex;align-items:center;gap:14px;padding:8px 12px;border-bottom:1px solid var(--line);background:var(--bg-2);flex-wrap:wrap}
.bar .grp{display:flex;gap:6px;align-items:center}
.spacer{flex:1}
.logo{display:flex;align-items:flex-end;gap:8px;text-decoration:none;color:inherit;line-height:1}
.logo .kanji{font-family:var(--display);font-size:24px;background:linear-gradient(170deg,var(--gold),var(--shu) 55%,var(--momo));-webkit-background-clip:text;background-clip:text;color:transparent}
.logo .sub{font-weight:900;color:var(--muted);font-size:12px;padding-bottom:2px}

.main{flex:1;min-height:0;display:flex}
.side{width:300px;flex:none;overflow-y:auto;border-right:1px solid var(--line);padding:6px 12px 20px;background:var(--bg-2)}
.side section{padding:10px 0 12px;border-bottom:1px solid var(--line);display:flex;flex-direction:column;gap:8px}
.side h3{margin:2px 0 0;font-family:var(--display);font-weight:400;font-size:14px;letter-spacing:.06em;color:var(--gold)}
.side label{display:flex;flex-direction:column;gap:3px;font-size:11.5px;font-weight:700;color:var(--muted)}
.side label input,.side label select,.side label output{color:var(--text);font-size:13px;font-weight:500;width:100%}
.side output{padding:6px 0;font-family:var(--display);font-weight:400}
.two{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.row{display:flex;gap:6px;align-items:center}
.row input{flex:1}
.hint{margin:0;font-size:11.5px;line-height:1.6;color:var(--muted)}
.bpms{display:flex;flex-direction:column;gap:4px}
.bh,.bpmrow{display:grid;grid-template-columns:1fr 1fr 30px;gap:6px;align-items:center}
.bh{font-size:11px;font-weight:700;color:var(--muted)}
.bpmrow button{padding:4px 0}
.tap output{min-width:52px;text-align:center}
.diffs{display:grid;grid-template-columns:repeat(3,1fr);gap:4px}
.diffs button{padding:7px 2px}
.diffs button.on[data-d=easy]{background:linear-gradient(135deg,#1fb9a4,#3a9ee8);border-color:transparent}
.diffs button.on[data-d=normal]{background:linear-gradient(135deg,#f59e1b,#ec5a2c);border-color:transparent}
.diffs button.on[data-d=hard]{background:linear-gradient(135deg,#e8388f,#7a45f0);border-color:transparent}

.stage{flex:1;min-width:0;display:flex;flex-direction:column}
.tools{display:flex;gap:12px;align-items:center;padding:7px 10px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.seg{display:flex;gap:3px;padding:3px;border-radius:11px;background:var(--surface);border:1px solid var(--line)}
.seg button{border:0;background:none;padding:5px 10px;border-radius:8px;color:var(--muted)}
.seg button.on{background:var(--text);color:var(--bg)}
.tools label{display:flex;align-items:center;gap:6px;font-size:12px;font-weight:700;color:var(--muted)}
.tools input[type=range]{width:110px}
.canvasWrap{flex:1;min-height:0;position:relative}
#cv{position:absolute;inset:0;width:100%;height:100%;display:block;cursor:crosshair}
.drop{position:absolute;inset:12px;border:2px dashed var(--gold);border-radius:18px;display:none;align-items:center;justify-content:center;font-weight:900;font-size:18px;background:rgba(13,10,36,.8);pointer-events:none}
.drop.on{display:flex}
.status{display:flex;gap:16px;align-items:center;padding:6px 10px;border-top:1px solid var(--line);background:var(--bg-2);font-variant-numeric:tabular-nums;font-weight:700}
.status .play{width:40px;padding:5px 0}
.muted{color:var(--muted)}

.modal{position:fixed;inset:0;background:rgba(5,3,16,.7);display:none;align-items:center;justify-content:center;z-index:10;padding:16px}
.modal.on{display:flex}
.modal .panel{background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:18px 20px;max-width:860px;width:100%;max-height:100%;overflow-y:auto}
.modal h2{margin:0 0 8px;font-family:var(--display);font-weight:400}
.modal h4{margin:12px 0 4px;color:var(--gold)}
.modal ul{margin:0;padding-left:1.2em;line-height:1.8}
.modal .cols{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.modal .hint{margin:12px 0}
#toast{position:fixed;left:50%;bottom:56px;transform:translate(-50%,20px);opacity:0;z-index:20;background:var(--text);color:var(--bg);font-weight:700;padding:10px 16px;border-radius:12px;transition:opacity .25s,transform .25s;pointer-events:none;max-width:90vw}
#toast.on{opacity:1;transform:translate(-50%,0)}
@media (max-width:760px){
  .side{display:none}
  .modal .cols{grid-template-columns:1fr}
}