:root{--bg:#111418;--panel:#1a1f26;--line:#262d36;--text:#eef1f5;--dim:#7d8794;--rec:#ff3b4a;--play:#27d47a;--wait:#ffc21a;--mute:#4d5a66;
  --sb:env(safe-area-inset-bottom,0px);--st:env(safe-area-inset-top,0px)}
[hidden]{display:none!important}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;height:100%;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,"Hiragino Sans","Noto Sans JP",sans-serif;overscroll-behavior:none}
body{user-select:none;-webkit-user-select:none;touch-action:manipulation}
button{font:inherit;color:inherit;background:var(--panel);border:0;border-radius:14px;cursor:pointer;min-height:44px;min-width:44px}
button:disabled{opacity:.35}
#app{display:flex;flex-direction:column;height:100dvh;height:100vh;max-width:560px;margin:0 auto;padding:calc(var(--st) + 4px) 10px calc(var(--sb) + 4px)}
@supports(height:100dvh){#app{height:100dvh}}

/* 上: 状態・テンポ・保存・設定 */
#top{display:flex;align-items:center;gap:8px;height:48px;flex:none}
#stDot{width:12px;height:12px;border-radius:50%;background:var(--mute);flex:none}
#stText{font-weight:800;font-size:17px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1;min-width:0}
.chip{padding:0 12px;border-radius:22px;display:flex;align-items:center;gap:3px;font-size:15px;color:var(--dim)}
.chip b{color:var(--text);font-size:16px}
.chip .sep{margin:0 2px}
.icon{background:none;font-size:22px;width:44px;padding:0}
body.t-play #stDot{background:var(--play)}
body.t-countin #stDot,body.r-armed #stDot{background:var(--wait);animation:blink .5s steps(2) infinite}
body.r-rec #stDot{background:var(--rec)}
body.r-rec #stText{color:var(--rec)}

/* 小節表示 */
#pos{height:40px;flex:none;margin:2px 0 6px}
#posCv{width:100%;height:100%;display:block}

/* トラック */
#tracks{flex:1;display:flex;flex-direction:column;gap:8px;min-height:0}
.track{flex:1;min-height:72px;max-height:120px;display:flex;align-items:stretch;gap:8px;background:var(--panel);border-radius:16px;padding:8px;border:2px solid transparent}
.tnum{width:44px;flex:none;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:0;background:#232a33;padding:0}
.tnum .n{font-size:22px;font-weight:800;line-height:1}
.tnum .dots{font-size:14px;color:var(--dim);line-height:1}
.wave{flex:1;min-width:0;position:relative;border-radius:10px;background:#141920;overflow:hidden}
.wave canvas{position:absolute;inset:0;width:100%;height:100%}
.mute{width:48px;flex:none;font-weight:800;font-size:18px;background:#232a33;align-self:center;height:56px}
.mute.on{background:#e8eaee;color:#111}
.rec{width:68px;flex:none;display:flex;align-items:center;justify-content:center;background:#2a1a1e}
.rec .ri{width:30px;height:30px;border-radius:50%;background:var(--rec);display:block}
.track.has{border-color:rgba(39,212,122,.25)}
body.t-play .track.has:not(.muted){border-color:var(--play)}
.track.muted .tnum .n{color:var(--dim)}
.track.s-armed{border-color:var(--wait);animation:blinkb .5s steps(2) infinite}
.track.s-armed .rec{background:#3a2a10}
.track.s-armed .rec .ri{background:var(--wait)}
.track.s-rec{border-color:var(--rec);background:#2a1418}
.track.s-rec .rec{background:var(--rec)}
.track.s-rec .rec .ri{border-radius:4px;background:#fff;width:26px;height:26px}
@keyframes blink{50%{opacity:.25}}
@keyframes blinkb{50%{border-color:transparent}}

/* 下: 全体の操作 */
#transport{display:flex;gap:8px;height:84px;flex:none;margin-top:10px}
.tbtn{flex:1;font-size:28px;border-radius:18px}
.tbtn.big{flex:2;font-size:34px;background:#1f3a2b;color:var(--play)}
body.t-play .tbtn.big,body.t-countin .tbtn.big{background:#e8eaee;color:#111}
#btnMetro.on{color:var(--wait);background:#2c2614}
#hint{height:22px;flex:none;text-align:center;font-size:12px;color:var(--dim);line-height:22px}

/* シート */
#sheetBack{position:fixed;inset:0;background:rgba(0,0,0,.55);z-index:10}
.sheet{position:fixed;left:0;right:0;bottom:0;max-width:560px;margin:0 auto;background:#1b2027;border-radius:22px 22px 0 0;padding:18px 18px calc(var(--sb) + 18px);z-index:11;max-height:92vh;overflow:auto;display:flex;flex-direction:column;gap:10px}
.sheet h2{margin:0 0 4px;font-size:19px}
.sheet h2 small{color:var(--dim);font-weight:500;font-size:13px;margin-left:6px}
.brand{margin:0;font-size:22px;letter-spacing:.06em}
.brand small{display:block;font-size:12px;color:var(--dim);letter-spacing:0;font-weight:500}
.row{display:flex;align-items:center;gap:10px;min-height:44px}
.row .lbl{flex:1;font-size:15px}
.row.sub{min-height:20px;justify-content:flex-end;color:var(--dim);font-size:13px}
.row input[type=range]{flex:1.4}
.row output{min-width:54px;text-align:right;font-weight:700}
.stepper{display:flex;align-items:center;gap:6px}
.stepper output{min-width:46px;text-align:center;font-size:22px;font-weight:800}
.sq{width:44px;font-size:20px}
.sq.wide{width:auto;padding:0 12px;font-size:14px}
.seg{display:flex;gap:4px}
.seg button{min-width:44px;padding:0 6px;font-weight:700;background:#262d36}
.sheet .seg button.sel,.seg button.sel{background:var(--play);color:#111}
.toggle{min-width:72px;background:#262d36;color:var(--dim);font-weight:700}
.sheet .toggle.on,.toggle.on{background:var(--play);color:#111}
.note{margin:-4px 0 0;font-size:12px;color:var(--dim)}
.note.center{text-align:center;margin-top:0}
.warn{margin:0;color:var(--wait);font-size:13px}
.sheet .primary,.primary{height:60px;background:var(--rec);color:#fff;font-size:20px;font-weight:800;border-radius:18px}
.sheet .danger,.danger{background:#3a1a1e;color:#ff8a93}
.sheet button{background:#262d36}
.closeSheet{background:#262d36}
select{font:inherit;color:var(--text);background:#262d36;border:0;border-radius:12px;height:44px;padding:0 10px;flex:1.4}
.help{margin:4px 0;padding-left:18px;color:var(--dim);font-size:13px;line-height:1.6}
#toast{position:fixed;left:50%;top:calc(var(--st) + 56px);transform:translateX(-50%);background:#e8eaee;color:#111;padding:10px 16px;border-radius:12px;font-size:14px;z-index:20;max-width:90vw;text-align:center}
@media (orientation:landscape) and (max-height:500px){
  #transport{height:60px}
  .track{min-height:48px}
  #hint{display:none}
}