:root{
  --bg:#eceff4; --panel:#ffffff; --panel2:#f4f6f9; --ink:#161a22; --muted:#667085;
  --line:#dde2ea; --accent:#2f5bea; --accent-ink:#ffffff; --accent-soft:#e8eeff;
  --danger:#d93a3a; --ok:#1f9d55; --warn:#c07a00;
  --shadow:0 1px 2px rgba(16,24,40,.06),0 10px 30px rgba(16,24,40,.08);
  --chrome-h:150px; --transport-real:60px;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#11141a; --panel:#1a1e26; --panel2:#232833; --ink:#e7eaf0; --muted:#9aa3b2;
    --line:#2f3542; --accent:#6d8dff; --accent-ink:#0d1020; --accent-soft:#252f4d;
    --shadow:0 1px 2px rgba(0,0,0,.4),0 10px 30px rgba(0,0,0,.35);
  }
}
:root[data-theme="dark"]{
  --bg:#11141a; --panel:#1a1e26; --panel2:#232833; --ink:#e7eaf0; --muted:#9aa3b2;
  --line:#2f3542; --accent:#6d8dff; --accent-ink:#0d1020; --accent-soft:#252f4d;
}
*{box-sizing:border-box}
[hidden]{display:none !important}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font:14px/1.45 Inter,system-ui,-apple-system,"Segoe UI",sans-serif;min-height:100vh;display:flex;flex-direction:column;padding-bottom:calc(var(--transport-real) + 30px)}
button,input,select{font:inherit;color:inherit}
select,input[type=number],input[type=email],input[type=password],input[type=text],input:not([type]){background:var(--panel2);border:1px solid var(--line);border-radius:7px;padding:5px 7px}
select:focus,input:focus{outline:2px solid var(--accent);outline-offset:-1px}
.mus{font-family:"Noto Music","Segoe UI Symbol",serif;font-size:20px;line-height:1}
.muted{color:var(--muted)}
code{background:var(--panel2);border:1px solid var(--line);border-radius:4px;padding:0 4px}
kbd{background:var(--panel2);border:1px solid var(--line);border-bottom-width:2px;border-radius:5px;padding:0 5px;font:12px ui-monospace,Consolas,monospace}

/* ---------- header ---------- */
.chrome{position:sticky;top:0;z-index:30;background:var(--panel);border-bottom:1px solid var(--line)}
.topbar{display:flex;align-items:center;gap:12px;padding:10px 16px 6px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:15px;white-space:nowrap}
.brand .logo{width:30px;height:30px;border-radius:8px;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font-size:18px}
.meta{display:flex;gap:8px;flex:1;min-width:240px}
.meta input{flex:1;min-width:0;padding:7px 10px}
.meta input#titleIn{font-weight:600;flex:1.4}
.actions{display:flex;gap:6px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:6px;border:1px solid var(--line);background:var(--panel);border-radius:8px;padding:7px 11px;cursor:pointer;white-space:nowrap}
.btn:hover{background:var(--panel2)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink);font-weight:600}
.btn.primary:hover{filter:brightness(1.07)}
.btn.small{padding:4px 9px;font-size:12px}
.btn.danger{color:var(--danger)}
.btn:disabled{opacity:.5;cursor:default}
.btn.dirty::after{content:"";width:7px;height:7px;border-radius:50%;background:var(--warn);display:inline-block}
.help-btn{border-color:var(--accent);color:var(--accent);font-weight:600}
.menu-wrap{position:relative}
.menu{position:absolute;right:0;top:calc(100% + 4px);background:var(--panel);border:1px solid var(--line);border-radius:10px;box-shadow:var(--shadow);padding:6px;min-width:250px;z-index:40;display:flex;flex-direction:column}
.menu button{border:0;background:transparent;text-align:left;padding:7px 10px;border-radius:6px;cursor:pointer}
.menu button:hover{background:var(--panel2)}
.menu hr{border:0;border-top:1px solid var(--line);margin:4px 0}

.toolbar{display:flex;flex-wrap:wrap;gap:8px;padding:4px 16px 8px;align-items:stretch}
.toolbar.expr{padding-top:0}
.group{display:flex;align-items:center;gap:2px;padding:3px;background:var(--panel2);border:1px solid var(--line);border-radius:10px;flex-wrap:wrap}
.group .lbl{font-size:10px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);padding:0 6px 0 4px}
.tb{min-width:34px;height:32px;border:0;background:transparent;border-radius:7px;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:4px;padding:0 7px}
.tb:hover{background:var(--line)}
.tb.on{background:var(--accent);color:var(--accent-ink)}
.tb small{font-size:11px;font-weight:600}
.tb.dyn{font-family:"Times New Roman",Times,serif;font-style:italic;font-weight:700;font-size:16px}
.tb:disabled{opacity:.4;cursor:default}
.toolbar select{height:30px;padding:3px 5px}
.expr.disabled .group{opacity:.55}
.expr-hint{align-self:center;font-size:12px;color:var(--muted)}

/* ---------- tabs ---------- */
.tabs{display:flex;gap:6px;padding:10px 16px 0;overflow-x:auto;align-items:flex-end;scrollbar-width:thin}
.tab{display:inline-flex;align-items:center;gap:7px;border:1px solid var(--line);border-bottom:0;background:var(--panel2);border-radius:10px 10px 0 0;padding:8px 12px;cursor:pointer;white-space:nowrap;color:var(--muted);font-weight:500}
.tab:hover{color:var(--ink)}
.tab.on{background:var(--panel);color:var(--ink);font-weight:600;box-shadow:0 -2px 0 var(--accent) inset}
.tab .badge{font-size:11px;background:var(--accent-soft);color:var(--accent);border-radius:5px;padding:0 5px;font-weight:700}
.tab .off{opacity:.45}
.tab.add{border-style:dashed;color:var(--accent)}
.tab .sw{width:8px;height:8px;border-radius:50%}

/* ---------- layout ---------- */
.layout{flex:1;display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:16px;padding:0 16px 16px;align-items:start}
.stage{min-width:0;background:var(--panel);border:1px solid var(--line);border-radius:0 12px 12px 12px;padding:14px}
#paper{position:relative;background:#fff;color:#111;border-radius:4px;box-shadow:var(--shadow);max-width:1150px;margin:0 auto;min-height:420px;overflow:hidden;user-select:none}
#paper.m-write{cursor:crosshair}
#paper.m-erase{cursor:not-allowed}
#paper.m-chord{cursor:text}
#score svg{display:block}
#overlay{position:absolute;left:0;top:0;pointer-events:none}
.err{padding:24px;color:var(--danger)}

.note-pop{position:absolute;z-index:5;display:flex;gap:2px;background:#1d2230;border-radius:9px;padding:3px;box-shadow:0 6px 20px rgba(0,0,0,.25);transform:translateX(-50%)}
.note-pop button{border:0;background:transparent;color:#fff;min-width:30px;height:30px;border-radius:6px;cursor:pointer;font-size:14px}
.note-pop button.mus{font-size:18px}
.note-pop button:hover{background:rgba(255,255,255,.14)}
.note-pop button.danger:hover{background:#d93a3a}
.chord-input{position:absolute;z-index:6;width:110px;font:700 15px Georgia,serif;padding:4px 6px;border:2px solid #2f5bea;border-radius:6px;background:#fff;color:#111}
.chord-input.bad{border-color:#d93a3a}

.side{position:sticky;top:calc(var(--chrome-h) + 12px);display:flex;flex-direction:column;gap:14px;max-height:calc(100vh - var(--chrome-h) - var(--transport-real) - 40px);overflow:auto;padding-bottom:4px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:12px}
.card h3{margin:0 0 8px;font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);display:flex;justify-content:space-between;align-items:center;gap:8px}
.card h3 .sub{text-transform:none;letter-spacing:0;font-weight:500}
.field{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:8px;font-size:13px}
.field.check{cursor:pointer}
.beat-check span{font-size:12px}
.beat-check span.ok{color:var(--ok)}
.beat-check span.bad{color:var(--warn);font-weight:600}
.field select{max-width:170px}
.num{display:inline-flex;align-items:center;gap:3px}
.num input{width:62px;text-align:center}
.hint{color:var(--accent);cursor:help}
.ib{border:0;background:transparent;cursor:pointer;border-radius:6px;min-width:26px;height:26px;color:var(--muted)}
.ib:hover{background:var(--line);color:var(--ink)}
.row-btns{display:flex;gap:6px;margin-top:10px;flex-wrap:wrap}
.row-btns.right{justify-content:flex-end}
.info{font-size:12px;color:var(--muted);background:var(--panel2);border:1px solid var(--line);border-radius:8px;padding:8px;margin-top:8px}
.info b{color:var(--ink)}
.link{border:0;background:none;color:var(--accent);cursor:pointer;padding:0;text-decoration:underline}

.staff{border:1px solid var(--line);border-radius:10px;padding:7px;margin-top:8px;background:var(--panel2)}
.staff-head{display:flex;align-items:center;gap:4px}
.staff-head input{flex:1;min-width:0;border-color:transparent;background:transparent;font-weight:600;padding:3px 5px}
.staff-head input:hover{border-color:var(--line)}
.staff-row{display:flex;gap:6px;margin-top:6px}
.staff-row select{flex:1;min-width:0;font-size:13px;padding:3px 5px;background:var(--panel)}

.mix-sheet{border-top:1px solid var(--line);padding:7px 0}
.mix-sheet:first-child{border-top:0;padding-top:0}
.mix-head{display:flex;align-items:center;gap:8px;font-weight:600;font-size:13px;cursor:pointer}
.mix-part{display:flex;align-items:center;gap:6px;margin:5px 0 0 22px;font-size:12px;color:var(--muted)}
.mix-part span{flex:0 0 78px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.mix-part input[type=range]{flex:1;min-width:0;accent-color:var(--accent)}
.tog{border:1px solid var(--line);background:var(--panel);border-radius:6px;width:26px;height:24px;cursor:pointer;font-weight:700;font-size:11px}
.tog.on.mute{background:var(--danger);border-color:var(--danger);color:#fff}
.tog.on.solo{background:var(--warn);border-color:var(--warn);color:#fff}

/* ---------- transport ---------- */
.transport{position:fixed;left:0;right:0;bottom:24px;min-height:56px;background:var(--panel);border-top:1px solid var(--line);display:flex;align-items:center;gap:18px;padding:8px 16px;z-index:35;flex-wrap:wrap;box-shadow:0 -4px 20px rgba(0,0,0,.05)}
.tp-group{display:flex;align-items:center;gap:8px}
.tp-group.tempo input[type=range]{width:160px;accent-color:var(--accent)}
.tp-group.tempo input[type=number]{width:64px}
.tp-group input[type=range]{accent-color:var(--accent)}
.btn.play{min-width:110px;justify-content:center;font-size:15px}
.btn.icon{min-width:38px;justify-content:center}
.tp-pos{font-variant-numeric:tabular-nums;font-weight:600;min-width:120px;color:var(--accent)}
.tp-status{margin-left:auto;color:var(--muted);font-size:12px}
.check{display:inline-flex;align-items:center;gap:5px;cursor:pointer;font-size:13px}
.hintbar{position:fixed;left:0;right:0;bottom:0;height:24px;background:var(--panel2);border-top:1px solid var(--line);font-size:12px;color:var(--muted);display:flex;justify-content:space-between;gap:16px;padding:3px 16px;z-index:35;overflow:hidden;white-space:nowrap}
.hintbar b{color:var(--ink)}

#toast{position:fixed;left:50%;bottom:100px;transform:translateX(-50%) translateY(20px);background:#1d2230;color:#fff;padding:9px 14px;border-radius:8px;font-size:13px;opacity:0;transition:.2s;pointer-events:none;z-index:60;max-width:90vw;text-align:center}
#toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---------- sign-in page ---------- */
.auth-page{padding:16px;align-items:center;justify-content:center}
.auth-card{width:100%;max-width:400px;background:var(--panel);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);padding:24px}
.auth-card .brand{margin-bottom:18px}
.auth-card h1{margin:0;font-size:20px}
.auth-card p{margin:0}
.auth-card .btn.primary{justify-content:center;padding:9px 12px}
.auth-card input{padding:8px 10px}
.small{font-size:12px}
.auth-err{color:var(--danger);font-size:13px}

/* ---------- account menu, people ---------- */
.acct-btn{max-width:200px}
.acct-btn span{overflow:hidden;text-overflow:ellipsis}
.menu .menu-who{padding:6px 10px 8px;font-size:12px;color:var(--muted);border-bottom:1px solid var(--line);margin-bottom:4px}
.menu .menu-who b{display:block;color:var(--ink);font-size:13px}
.invite-link{display:flex;gap:6px;margin-top:10px;align-items:center}
.invite-link input{flex:1;min-width:0;font:12px ui-monospace,Consolas,monospace}
.people-row .tag{font-size:11px;font-weight:700;border-radius:5px;padding:0 6px;background:var(--accent-soft);color:var(--accent);margin-left:6px}
.people-row .tag.off{background:var(--panel2);color:var(--muted)}
.people-row.disabled .t b{color:var(--muted);text-decoration:line-through}

/* ---------- dialogs ---------- */
dialog{border:1px solid var(--line);border-radius:14px;background:var(--panel);color:var(--ink);max-width:560px;width:calc(100% - 32px);padding:0;box-shadow:var(--shadow)}
dialog.wide{max-width:900px}
dialog::backdrop{background:rgba(10,12,18,.5)}
.dlg-head{display:flex;align-items:center;gap:14px;padding:14px 18px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.dlg-head h2{margin:0;font-size:17px}
.dlg-head .close{margin-left:auto}
.dtabs{display:flex;gap:4px;flex-wrap:wrap}
.dtabs button{border:1px solid var(--line);background:var(--panel2);border-radius:8px;padding:5px 10px;cursor:pointer;font-size:13px}
.dtabs button.on{background:var(--accent);border-color:var(--accent);color:var(--accent-ink);font-weight:600}
.dlg-body{padding:16px 20px;max-height:72vh;overflow:auto}
.dlg-body h4{margin:16px 0 8px;font-size:12px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.dlg-body h4:first-child{margin-top:0}
.form-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:10px 14px}
.form-grid.one{grid-template-columns:1fr}
.form-grid label{display:flex;flex-direction:column;gap:4px;font-size:12px;color:var(--muted);font-weight:500}
.form-grid label select,.form-grid label input{color:var(--ink);font-size:14px}
.check-inline{flex-direction:row !important;align-items:center;gap:8px !important;font-size:14px !important;color:var(--ink) !important;padding-top:18px}
.store-note{background:var(--accent-soft);border-radius:8px;padding:10px 12px;font-size:13px}
.song-list{margin-top:12px;display:flex;flex-direction:column;gap:6px}
.song-row{display:flex;align-items:center;gap:10px;border:1px solid var(--line);border-radius:10px;padding:8px 10px}
.song-row .t{flex:1;min-width:0}
.song-row .t b{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.song-row .t small{color:var(--muted)}
.song-row.current{border-color:var(--accent)}
.lib-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:10px;margin-top:10px}
.lib-card{border:1px solid var(--line);border-radius:12px;padding:12px;display:flex;flex-direction:column;gap:6px;background:var(--panel2)}
.lib-card .cat{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--accent)}
.lib-card b{font-size:15px}
.lib-card p{margin:0;font-size:13px;color:var(--muted);flex:1}
.lib-card .btn{align-self:flex-start}
.steps li{margin:6px 0}
.answer{background:var(--panel2);border:1px solid var(--line);border-radius:10px;padding:10px 12px;margin-top:10px;font-size:14px}
table.tr-table,table.legend,table.kbd-table{border-collapse:collapse;width:100%;margin-top:8px;font-size:13px}
.tr-table th,.tr-table td,.legend td,.legend th,.kbd-table td{border-bottom:1px solid var(--line);padding:6px 8px;text-align:left;vertical-align:top}
.tr-table th,.legend th{font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.legend .sym{font-family:"Noto Music","Segoe UI Symbol",serif;font-size:24px;width:70px;text-align:center}
.legend .sym.txt{font-family:"Times New Roman",serif;font-style:italic;font-weight:700;font-size:20px}
.legend .sym.plain{font-family:Georgia,serif;font-weight:700;font-size:16px}

@media (max-width: 1040px){
  .layout{grid-template-columns:1fr}
  .side{position:static;max-height:none}
}
@media (max-width: 640px){
  .topbar,.toolbar,.tabs{padding-left:10px;padding-right:10px}
  .layout{padding:0 10px 10px}
  .stage{padding:6px}
  .group .lbl{display:none}
  .chrome{position:static}
  .tp-group.tempo input[type=range]{width:100px}
  .transport{gap:10px}
  .expr-hint{display:none}
}