@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Playfair+Display:wght@400;700&family=DM+Mono:wght@300;400;500&display=swap');

/* ═══════════════════════════════════════════════════
   DESIGN SYSTEM — V9.6.0
   Base:    #0f172a  (Slate-950)
   Surface: #1e293b  (Slate-800)
   Accent:  #6366f1  (Indigo-500)
   Accent2: #0ea5e9  (Neon-Cyan)
   ═══════════════════════════════════════════════════ */
:root{
  --bg:       #0f172a;
  --surface:  #1e293b;
  --surface2: #243447;
  --surface3: #2d3f56;
  --border:   rgba(255,255,255,.07);
  --border-s: rgba(255,255,255,.12);
  --accent:   #6366f1;
  --accent2:  #0ea5e9;
  --green:    #22d3a0;
  --red:      #f87171;
  --purple:   #a78bfa;
  --muted:    #64748b;
  --text:     #e2e8f0;
  --text-dim: #94a3b8;
  --sidebar-w: 220px;
  --topbar-h:  52px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,.25);
  --shadow-md: 0 8px 24px rgba(0,0,0,.35);
  --shadow-lg: 0 10px 40px -5px rgba(0,0,0,.45);
  --transition: all .2s ease-in-out;
}

*{box-sizing:border-box;margin:0;padding:0;}
body{background:var(--bg);color:var(--text);font-family:'Inter','system-ui',sans-serif;font-size:15px;line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased;}

/* ═══ LAYOUT ═══ */
#app{display:flex;min-height:100vh;}
#sidebar{
  width:var(--sidebar-w);flex-shrink:0;position:fixed;top:var(--topbar-h);left:0;bottom:0;
  background:var(--surface);border-right:1px solid var(--border);z-index:100;
  display:flex;flex-direction:column;transition:width .25s cubic-bezier(.4,0,.2,1);overflow:hidden;
  backdrop-filter:blur(12px);
}
#sidebar.collapsed{width:56px;}
#mainContent{flex:1;margin-left:var(--sidebar-w);padding:32px 24px;padding-top:calc(var(--topbar-h) + 32px);transition:margin-left .25s cubic-bezier(.4,0,.2,1);min-width:0;}
#sidebar.collapsed~#mainContent,#app.sidebar-collapsed #mainContent{margin-left:56px;}
.sections-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;max-width:980px;margin:0 auto;}

/* ─── Sidebar Accordion Groups ─── */
.sb-group{display:flex;flex-direction:column;border-bottom:1px solid var(--border);}
.sb-group-header{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;cursor:pointer;background:transparent;transition:var(--transition);user-select:none;border:none;width:100%;}
.sb-group-header:hover{background:var(--surface2);}
.sb-group-title{font-size:.65rem;text-transform:uppercase;letter-spacing:.12em;color:var(--accent2);font-weight:600;white-space:nowrap;}
.sb-group-arrow{font-size:.65rem;color:var(--muted);transition:transform .2s cubic-bezier(.4,0,.2,1);}
.sb-group.open .sb-group-arrow{transform:rotate(90deg);}
.sb-group-content{display:none;background:rgba(15,23,42,.2);}
.sb-group.open .sb-group-content{display:block;}
#sidebar.collapsed .sb-group-header{justify-content:center;padding:10px 0;}
#sidebar.collapsed .sb-group-title,#sidebar.collapsed .sb-group-arrow{display:none;}
#sidebar.collapsed .sb-group-content{display:block !important;}

/* ─── Sidebar Items ─── */
.sb-toggle{display:flex;align-items:center;gap:12px;padding:16px 14px;cursor:pointer;border-bottom:1px solid var(--border);flex-shrink:0;}
.sb-toggle-icon{flex-shrink:0;width:28px;text-align:center;display:flex;align-items:center;justify-content:center;}
.sb-toggle-icon svg,.sb-item-icon svg{width:18px;height:18px;stroke:currentColor;stroke-width:1.5;flex-shrink:0;}
.sb-toggle-label{font-family:'Playfair Display',serif;font-size:.9rem;background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;white-space:nowrap;opacity:1;transition:opacity .15s;}
#sidebar.collapsed .sb-toggle-label{opacity:0;pointer-events:none;width:0;overflow:hidden;}
#sidebar.collapsed .sb-item-label{opacity:0;pointer-events:none;width:0;overflow:hidden;}
.sb-items{flex:1;overflow-y:auto;overflow-x:hidden;padding:4px 0;}
.sb-item{display:flex;align-items:center;gap:12px;padding:10px 14px;cursor:pointer;transition:var(--transition);position:relative;white-space:nowrap;}
.sb-item:hover{background:var(--surface2);}
.sb-item.active{background:rgba(99,102,241,.1);border-right:3px solid var(--accent);}
.sb-item.active .sb-item-icon{color:var(--accent);filter:drop-shadow(0 0 6px var(--accent));}
.sb-item-icon{flex-shrink:0;width:28px;text-align:center;display:flex;align-items:center;justify-content:center;color:var(--muted);transition:color .2s;}
.sb-item:hover .sb-item-icon{color:var(--text);}
.sb-item-label{font-size:.78rem;color:var(--text-dim);white-space:nowrap;opacity:1;transition:opacity .15s;}
.sb-divider{height:1px;background:var(--border);margin:6px 8px;}
.sb-bottom{padding:8px 0;border-top:1px solid var(--border);flex-shrink:0;}
.sb-item.settings-item .sb-item-icon{color:var(--muted);}
.sb-item.settings-item:hover .sb-item-icon{color:var(--accent);}
#sidebar.collapsed .sb-item:hover::after{content:attr(data-label);position:absolute;left:62px;top:50%;transform:translateY(-50%);background:var(--surface3);color:var(--text);font-size:.72rem;padding:5px 12px;border-radius:var(--radius-sm);border:1px solid var(--border-s);white-space:nowrap;z-index:200;pointer-events:none;box-shadow:var(--shadow-md);}

/* ═══ TOPBAR ═══ */
#topbar{position:fixed;top:0;left:0;right:0;height:var(--topbar-h);z-index:200;background:rgba(15,23,42,.85);border-bottom:1px solid var(--border);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);display:flex;align-items:center;justify-content:space-between;padding:0 18px 0 14px;}
.topbar-left{display:flex;align-items:center;gap:12px;}
.topbar-hamburger{background:none;border:none;cursor:pointer;color:var(--muted);display:flex;flex-direction:column;gap:4px;padding:6px;border-radius:var(--radius-sm);transition:var(--transition);flex-shrink:0;}
.topbar-hamburger:hover{color:var(--accent);}
.topbar-hamburger span{display:block;width:18px;height:1.5px;background:currentColor;border-radius:1px;}
.topbar-appname{font-family:'Playfair Display',serif;font-size:1rem;background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;letter-spacing:.04em;}
.topbar-version{font-size:.6rem;color:var(--muted);letter-spacing:.1em;text-transform:uppercase;}
.mode-badge{font-size:.62rem;color:var(--accent2);letter-spacing:.06em;background:rgba(14,165,233,.1);border:1px solid rgba(14,165,233,.25);border-radius:20px;padding:3px 10px;font-family:'DM Mono',monospace;}

/* ═══ HEADER / STATS ═══ */
.app-header{text-align:center;margin-bottom:32px;max-width:980px;margin-left:auto;margin-right:auto;}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;}
.app-header h1{font-family:'Playfair Display',serif;font-size:2.2rem;letter-spacing:.02em;margin-bottom:4px;background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;}
.app-header p{color:var(--muted);font-size:.75rem;letter-spacing:.12em;text-transform:uppercase;}
.save-dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--green);margin-left:8px;opacity:0;transition:opacity .3s;}
.save-dot.show{opacity:1;}
.stats{display:flex;gap:20px;justify-content:center;margin-bottom:28px;flex-wrap:wrap;max-width:980px;margin-left:auto;margin-right:auto;}
.stat{text-align:center;}
.stat-num{font-family:'Playfair Display',serif;font-size:1.8rem;color:var(--accent);line-height:1;}
.stat-label{font-size:.62rem;color:var(--muted);text-transform:uppercase;letter-spacing:.1em;margin-top:2px;}
.vdiv{width:1px;height:40px;background:var(--border-s);align-self:center;}

/* ═══ CARDS ═══ */
.app-card{background:var(--surface);border:1px solid rgba(255,255,255,.05);border-radius:var(--radius-lg);padding:24px;box-shadow:0 10px 25px -5px rgba(0,0,0,.3);transition:box-shadow .2s ease-in-out,border-color .2s ease-in-out;}
.app-card:hover{border-color:rgba(255,255,255,.1);box-shadow:0 16px 40px -8px rgba(0,0,0,.4);}
.card{background:var(--surface);border:1px solid rgba(255,255,255,.05);border-radius:var(--radius-lg);padding:22px;box-shadow:var(--shadow-md);transition:box-shadow .2s ease-in-out,border-color .2s ease-in-out;}
.card:hover{border-color:rgba(255,255,255,.1);}
.card.wide{grid-column:1/-1;}
.card h2{font-family:'Playfair Display',serif;font-size:1.05rem;color:var(--accent);margin-bottom:16px;letter-spacing:.03em;}
[data-section]{transition:opacity .2s;}
[data-section].hidden{display:none !important;}

/* ═══ INSTRUMENT MODE VISIBILITY (kritisch — steuert Piano/Gitarre-Umschaltung) ═══ */
[data-instrument="guitar"]{display:none;}
[data-instrument="piano"]{display:block;}
body.guitar-mode [data-instrument="guitar"]{display:block;}
body.guitar-mode [data-instrument="piano"]{display:none;}
body.guitar-mode .guitar-hide{display:none !important;}
.guitar-show{display:none;}
body.guitar-mode .guitar-show{display:block !important;}

/* ═══ INSTRUMENT TOGGLE (Piano/Gitarre Umschalter) ═══ */
.instrument-toggle{display:flex;gap:0;border:1px solid var(--border);border-radius:10px;overflow:hidden;margin-top:4px;}
.instrument-btn{flex:1;padding:10px 14px;background:var(--surface2);border:none;color:var(--muted);font-family:'DM Mono',monospace;font-size:.8rem;cursor:pointer;transition:var(--transition);display:flex;flex-direction:column;align-items:center;gap:5px;}
.instrument-btn:hover{background:var(--surface3);color:var(--text);}
.instrument-btn.active{background:rgba(99,102,241,.12);color:var(--accent);border-color:var(--accent);}
.instrument-btn.active .ib-icon{opacity:1;}
.instrument-btn:first-child{border-right:1px solid var(--border);}
.instrument-btn .ib-icon{width:22px;height:22px;opacity:.7;}
.instrument-btn .ib-label{font-size:.7rem;letter-spacing:.06em;}

/* ═══ GUITAR FRETBOARD DIAGRAM (Tools) ═══ */
.fret-row{display:flex;align-items:center;height:14px;}
.fret-string{width:18px;height:14px;border-right:1px solid var(--border);display:flex;align-items:center;justify-content:center;position:relative;}
.fret-string::after{content:'';position:absolute;bottom:0;left:0;right:0;height:1px;background:var(--border);}
.fret-dot{width:10px;height:10px;border-radius:50%;background:var(--accent);position:relative;z-index:1;}
.fret-muted{font-size:.55rem;color:var(--red);}
.fret-open{font-size:.55rem;color:var(--green);}
.guitar-chord-grid{display:grid;gap:0;}
.guitar-chord-name{font-size:.78rem;color:var(--accent);font-family:'Playfair Display',serif;margin-bottom:2px;}

/* ═══ SEGMENTED CONTROLS ═══ */
.segmented-control{display:inline-flex;gap:2px;background:var(--surface2);border:1px solid var(--border);border-radius:50px;padding:3px;}
.seg-btn{background:transparent;border:none;border-radius:50px;color:var(--muted);cursor:pointer;font-family:'Inter','system-ui',sans-serif;font-size:.72rem;font-weight:500;letter-spacing:.02em;padding:5px 14px;transition:var(--transition);white-space:nowrap;}
.seg-btn:hover{color:var(--text);}
.seg-btn.active{background:var(--accent);color:#fff;box-shadow:0 2px 8px rgba(99,102,241,.4);}

/* ═══ BUTTONS ═══ */
.ibtn{background:transparent;border:1px solid var(--border-s);border-radius:var(--radius-sm);color:var(--muted);font-family:'DM Mono',monospace;font-size:.65rem;padding:3px 7px;cursor:pointer;transition:var(--transition);white-space:nowrap;}
.ibtn:hover{border-color:var(--accent2);color:var(--accent2);transform:translateY(-1px);}
.ibtn.red:hover{border-color:var(--red);color:var(--red);}
.ibtn.on{border-color:var(--accent);color:var(--accent);}
.ibtn.blue{border-color:var(--accent2);color:var(--accent2);}
.btn{background:transparent;border:1px solid var(--accent);border-radius:var(--radius-md);color:var(--accent);font-family:'DM Mono',monospace;font-size:.75rem;padding:8px 18px;cursor:pointer;transition:var(--transition);white-space:nowrap;}
.btn:hover{background:var(--accent);color:#fff;box-shadow:0 4px 14px rgba(99,102,241,.35);transform:translateY(-1px);}
.btn:active{transform:translateY(0);}
.btn.sm{padding:5px 9px;font-size:.7rem;}
.btn.b2{border-color:var(--accent2);color:var(--accent2);}
.btn.b2:hover{background:var(--accent2);color:#fff;box-shadow:0 4px 14px rgba(14,165,233,.35);}
.btn.red{border-color:var(--red);color:var(--red);}
.btn.red:hover{background:var(--red);color:#fff;}
.btn.green{border-color:var(--green);color:var(--green);}
.btn.green:hover{background:var(--green);color:#fff;}

/* ─── Inputs ─── */
.add-row{display:flex;gap:8px;margin-top:14px;padding-top:14px;border-top:1px solid var(--border);}
.add-row input{flex:1;background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-family:'DM Mono',monospace;font-size:.78rem;padding:8px 12px;outline:none;transition:border-color .2s;}
.add-row input:focus{border-color:var(--accent);}
.add-row input::placeholder{color:var(--muted);}
.row{display:flex;gap:8px;}
.row input{flex:1;background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-family:'DM Mono',monospace;font-size:.78rem;padding:8px 12px;outline:none;}
.row input::placeholder{color:var(--muted);}
.sn{font-size:.7rem;color:var(--muted);margin-bottom:8px;}
.progress-bar-wrap{height:4px;background:var(--border);border-radius:2px;margin-top:14px;overflow:hidden;}
.progress-bar-fill{height:100%;background:linear-gradient(90deg,var(--accent2),var(--accent));border-radius:2px;transition:width .5s;}
.progress-label{font-size:.65rem;color:var(--muted);text-align:right;margin-top:4px;}

/* ═══ COLLAPSIBLE SECTIONS ═══ */
.collapsible-section{border:1px solid var(--border);margin-bottom:12px;overflow:hidden;border-radius:var(--radius-md);}
.filter-section{margin-bottom:0;border-radius:0;border-left:none;border-right:none;border-bottom:none;}
.section-header{display:flex;align-items:center;justify-content:space-between;padding:13px 16px;cursor:pointer;background:var(--surface2);user-select:none;border-radius:var(--radius-md) var(--radius-md) 0 0;transition:background .15s;}
.section-header:hover{background:var(--surface3);}
.section-hl{display:flex;align-items:center;gap:10px;}
.section-title,.section-header h2{font-family:'Playfair Display',serif;font-size:.95rem;color:var(--accent);}
.section-header h2{margin:0;}
.section-chev{font-size:.8rem;color:var(--muted);transition:transform .25s;display:inline-block;}
.section-chev.open{transform:rotate(90deg);}
.section-body{display:none;padding:16px;}
.section-body.open{display:block;}

/* ═══ FILTER ═══ */
.filter-chip{font-size:.6rem;letter-spacing:.06em;padding:3px 10px;border-radius:20px;border:1px solid var(--border);color:var(--muted);cursor:pointer;transition:var(--transition);user-select:none;}
.filter-chip:hover{border-color:var(--accent2);color:var(--accent2);}
.filter-chip.active{background:rgba(99,102,241,.1);border-color:var(--accent);color:var(--accent);}
.filter-count{font-size:.65rem;color:var(--muted);padding:2px 0;}
.filter-chips{display:flex;gap:5px;flex-wrap:wrap;}

/* ═══ STATUS BADGE ═══ */
.status-badge{font-size:.54rem;letter-spacing:.07em;text-transform:uppercase;padding:2px 8px;border-radius:20px;border:1px solid;cursor:pointer;transition:var(--transition);white-space:nowrap;flex-shrink:0;}
.status-neu{color:var(--muted);border-color:var(--border-s);}
.status-lernen{color:var(--accent2);border-color:var(--accent2);}
.status-ueben{color:var(--accent);border-color:var(--accent);}
.status-auswendig{color:var(--purple);border-color:var(--purple);}
.status-beherrscht{color:var(--green);border-color:var(--green);}

/* ═══ PIECES ═══ */
.piece{background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px;margin-bottom:10px;transition:border-color .2s;}
.piece:hover{border-color:var(--border-s);}
.piece-header{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-bottom:8px;}
.piece-title{font-family:'Playfair Display',serif;font-size:.95rem;color:var(--accent2);flex:1;}
.star-row{display:flex;gap:3px;}
.star{font-size:15px;cursor:pointer;color:var(--border-s);transition:color .15s;}
.star.lit{color:var(--accent);}
.piece-tags{display:flex;gap:5px;flex-wrap:wrap;margin-bottom:8px;align-items:center;}
.tag{font-size:.58rem;letter-spacing:.07em;text-transform:uppercase;padding:2px 7px;border-radius:20px;border:1px solid var(--border);color:var(--muted);cursor:pointer;transition:var(--transition);}
.tag.active{border-color:var(--accent);color:var(--accent);}
.piece-actions{display:flex;gap:5px;flex-wrap:wrap;}
.add-form{margin-top:16px;padding-top:16px;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:10px;}
.tag-selector{display:flex;flex-wrap:wrap;gap:6px;}
.tag-opt{font-size:.62rem;letter-spacing:.08em;text-transform:uppercase;padding:3px 8px;border-radius:20px;border:1px solid var(--border);color:var(--muted);cursor:pointer;user-select:none;transition:var(--transition);}
.tag-opt.sel{border-color:var(--accent);color:var(--accent);}
.tag-add-panel{display:none;padding:6px 0 8px 0;}
.tag-add-panel.open{display:block;}
.tag-add-label{font-size:.6rem;color:var(--muted);margin-bottom:5px;letter-spacing:.08em;text-transform:uppercase;}
.tag-add-chips{display:flex;flex-wrap:wrap;gap:5px;}
.tag-add-chip{font-size:.6rem;padding:2px 7px;border-radius:20px;border:1px solid var(--border);color:var(--muted);cursor:pointer;transition:var(--transition);}
.tag-add-chip:hover{border-color:var(--accent);color:var(--accent);}
.note-panel{display:none;padding:4px 0 10px 28px;}
.note-panel.open{display:block;}
.note-panel textarea{width:100%;background:var(--surface3);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-family:'DM Mono',monospace;font-size:.74rem;padding:9px 11px;resize:vertical;min-height:60px;line-height:1.6;outline:none;transition:border-color .2s;}
.note-panel textarea:focus{border-color:var(--accent2);}
.note-panel textarea::placeholder{color:var(--muted);}

/* ═══ TEMPO INPUT ═══ */
.tempo-panel{display:none;padding:10px 0 6px 0;border-top:1px solid var(--border);margin-top:8px;}
.tempo-panel.open{display:block;}
.tempo-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:8px;}
.tempo-row label{font-size:.65rem;color:var(--muted);white-space:nowrap;}
.tempo-inp{width:65px;background:var(--surface3);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-family:'DM Mono',monospace;font-size:.8rem;padding:5px 8px;outline:none;text-align:center;transition:border-color .2s;}
.tempo-inp:focus{border-color:var(--accent);}
.tempo-bar-wrap{height:3px;background:var(--border);border-radius:2px;overflow:hidden;margin-top:4px;}
.tempo-bar-fill{height:100%;background:linear-gradient(90deg,var(--accent2),var(--accent));border-radius:2px;transition:width .4s;}
.tempo-bar-label{font-size:.6rem;color:var(--muted);margin-top:3px;}

/* ═══ THEORY ═══ */
.theory-section{border:1px solid var(--border);border-radius:var(--radius-md);margin-bottom:12px;overflow:hidden;}
.theory-header{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:13px 16px;cursor:pointer;background:var(--surface2);user-select:none;transition:background .15s;}
.theory-header:hover{background:var(--surface3);}
.theory-hl{display:flex;align-items:center;gap:10px;flex:1;min-width:0;}
.theory-title{font-family:'Playfair Display',serif;font-size:.95rem;color:var(--accent);}
.theory-prog{font-size:.65rem;color:var(--muted);}
.chev{font-size:.8rem;color:var(--muted);transition:transform .25s;display:inline-block;}
.chev.open{transform:rotate(90deg);}
.theory-body{display:none;padding:16px;}
.theory-body.open{display:block;}
.sub-section{margin-bottom:16px;padding-bottom:16px;border-bottom:1px solid var(--border);}
.sub-section:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0;}
.sub-title{font-size:.72rem;color:var(--accent2);letter-spacing:.1em;text-transform:uppercase;margin-bottom:10px;}
.chord-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:4px;}
.chord-btn{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 6px;text-align:center;cursor:pointer;transition:var(--transition);font-family:'DM Mono',monospace;}
.chord-btn:hover{border-color:var(--accent);transform:translateY(-1px);}
.chord-btn .cn{font-size:.85rem;color:var(--text);display:block;margin-bottom:2px;}
.chord-btn .cs{font-size:.65rem;color:var(--muted);}
.chord-btn.learned{background:rgba(34,211,160,.1);border-color:var(--green);}
.chord-btn.learned .cn{color:var(--green);}
.qz-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:6px;margin-bottom:4px;}
.qz-item{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 4px;text-align:center;font-size:.7rem;color:var(--muted);}
.qz-item span{display:block;font-size:.82rem;color:var(--text);margin-bottom:2px;}
.sec-note-wrap{margin-top:14px;padding-top:14px;border-top:1px solid var(--border);}
.sec-note-label{font-size:.65rem;color:var(--muted);letter-spacing:.08em;text-transform:uppercase;margin-bottom:6px;}
.sec-note-wrap textarea{width:100%;background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-family:'DM Mono',monospace;font-size:.74rem;padding:9px 11px;resize:vertical;min-height:60px;line-height:1.6;outline:none;transition:border-color .2s;}
.sec-note-wrap textarea:focus{border-color:var(--accent2);}
.sec-note-wrap textarea::placeholder{color:var(--muted);}
.theory-subsection{border-top:1px solid var(--border);margin-top:12px;padding-top:12px;}
.sub-section-header{display:flex;align-items:center;gap:8px;padding:8px 0;cursor:pointer;}
.tool-subsection{border:1px solid var(--border);border-radius:var(--radius-md);margin-bottom:12px;overflow:hidden;}
.tool-sub-header{display:flex;align-items:center;justify-content:space-between;padding:13px 16px;cursor:pointer;background:var(--surface2);user-select:none;border-radius:var(--radius-md) var(--radius-md) 0 0;transition:background .15s;}
.tool-sub-header:hover{background:var(--surface3);}
.tool-sub-header h3{font-size:.72rem;color:var(--accent2);letter-spacing:.1em;text-transform:uppercase;margin:0;}
.tool-sub-body{display:none;padding:16px;}
.tool-sub-body.open{display:block;}
.tool-subsection:last-child{margin-bottom:0;}

/* ═══ METRONOME ═══ */
.metro-layout{display:grid;grid-template-columns:1fr 250px;gap:24px;align-items:start;}
@media(max-width:640px){.metro-layout{grid-template-columns:1fr;}}
.metro-main{display:flex;flex-direction:column;gap:12px;align-items:center;}
.metro-beats{display:flex;gap:10px;justify-content:center;}
.metro-beat-dot{width:16px;height:16px;border-radius:50%;border:2px solid var(--border-s);transition:background .06s,box-shadow .06s;}
.metro-beat-dot.active{background:var(--accent2);border-color:var(--accent2);box-shadow:0 0 12px var(--accent2);}
.metro-beat-dot.downbeat.active{background:var(--accent);border-color:var(--accent);box-shadow:0 0 16px var(--accent);}
.metro-bpm-row{display:flex;align-items:center;gap:8px;}
.metro-adj{background:transparent;border:1px solid var(--border-s);border-radius:var(--radius-sm);color:var(--muted);font-family:'DM Mono',monospace;font-size:.68rem;padding:5px 9px;cursor:pointer;transition:var(--transition);}
.metro-adj:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-1px);}
.metro-bpm-val{font-family:'Playfair Display',serif;font-size:4.2rem;color:var(--accent);line-height:1;min-width:110px;text-align:center;}
.metro-bpm-unit{font-size:.62rem;color:var(--muted);text-align:center;letter-spacing:.1em;text-transform:uppercase;}
.metro-ts-row,.metro-subdiv-row{display:flex;gap:6px;flex-wrap:wrap;justify-content:center;}
.metro-controls{display:flex;gap:10px;align-items:center;flex-wrap:wrap;justify-content:center;}
.metro-play-btn{min-width:100px;}
.metro-hint{font-size:.58rem;color:var(--muted);text-align:center;opacity:.6;}
.metro-presets{padding-left:0;}
@media(min-width:641px){.metro-presets{padding-left:20px;border-left:1px solid var(--border);}}
.metro-preset-item{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:7px 0;border-bottom:1px solid var(--border);}
.metro-preset-item:last-child{border-bottom:none;}
.metro-preset-info{flex:1;min-width:0;}
.metro-preset-name{font-family:'Playfair Display',serif;font-size:.85rem;color:var(--accent);display:block;}
.metro-preset-meta{font-size:.62rem;color:var(--accent2);}
.metro-preset-note{font-size:.6rem;color:var(--muted);display:block;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.metro-preset-btns{display:flex;gap:5px;flex-shrink:0;}
.metro-preset-form{margin-top:12px;padding-top:12px;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:7px;}
.metro-preset-form input{background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-family:'DM Mono',monospace;font-size:.74rem;padding:7px 10px;outline:none;transition:border-color .2s;}
.metro-preset-form input:focus{border-color:var(--accent);}

/* ═══ FLASHCARDS ═══ */
.fc-header{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:16px;}
.fc-streak-wrap{display:flex;align-items:center;gap:8px;margin-left:auto;}
.fc-streak-badge{display:none;align-items:center;gap:5px;background:rgba(99,102,241,.12);border:1px solid rgba(99,102,241,.35);border-radius:20px;padding:3px 10px;font-size:.72rem;color:var(--accent);}
.fc-streak-badge.visible{display:flex;}
.fc-streak-badge.milestone{animation:streak-pulse .5s ease;}
@keyframes streak-pulse{0%,100%{transform:scale(1);}50%{transform:scale(1.18);}}
.fc-streak-msg{position:fixed;top:80px;left:50%;transform:translateX(-50%);background:var(--surface3);border:1px solid var(--accent);border-radius:var(--radius-md);padding:10px 22px;font-family:'Playfair Display',serif;font-size:1rem;color:var(--accent);z-index:9999;pointer-events:none;animation:fade-pop .4s ease;}
@keyframes fade-pop{0%{opacity:0;transform:translateX(-50%) scale(.85);}60%{opacity:1;transform:translateX(-50%) scale(1.05);}100%{transform:translateX(-50%) scale(1);}}
.fc-card-area{display:flex;flex-direction:column;align-items:center;gap:16px;width:100%;}
.fc-progress-wrap{width:100%;max-width:480px;}
.fc-prog-track{display:flex;gap:3px;margin-bottom:6px;}
.fc-prog-dot{height:5px;flex:1;border-radius:3px;background:var(--border);transition:background .3s;}
.fc-prog-dot.correct{background:var(--green);}
.fc-prog-dot.wrong{background:var(--red);}
.fc-prog-dot.current{background:var(--accent);animation:dot-pulse .8s infinite alternate;}
@keyframes dot-pulse{from{opacity:.5;}to{opacity:1;}}
.fc-score{font-size:.66rem;color:var(--muted);text-align:right;}
.fc-card{width:100%;max-width:380px;min-height:190px;background:var(--surface2);border:1px solid rgba(255,255,255,.05);border-radius:var(--radius-lg);padding:30px 26px;display:flex;flex-direction:column;align-items:center;gap:16px;text-align:center;transition:border-color .25s,box-shadow .25s;box-shadow:var(--shadow-sm);}
.fc-card.revealed{border-color:var(--accent2);box-shadow:0 0 0 1px var(--accent2),0 8px 32px rgba(14,165,233,.2);}
.fc-card.shake{animation:card-shake .4s ease;}
@keyframes card-shake{0%,100%{transform:translateX(0);}20%{transform:translateX(-8px);}60%{transform:translateX(6px);}80%{transform:translateX(-4px);}}
.fc-type{font-size:.58rem;color:var(--muted);text-transform:uppercase;letter-spacing:.14em;background:var(--surface3);border-radius:20px;padding:2px 10px;border:1px solid var(--border);}
.fc-name{font-family:'Playfair Display',serif;font-size:3.4rem;color:var(--accent);line-height:1;}
.fc-enharmonic{font-size:.68rem;color:var(--muted);margin-top:-10px;letter-spacing:.06em;}
.fc-notes{font-size:1.1rem;color:var(--accent2);letter-spacing:.14em;padding:10px 22px;border:1px solid var(--accent2);border-radius:var(--radius-sm);background:rgba(14,165,233,.06);animation:reveal-in .25s ease;}
@keyframes reveal-in{from{opacity:0;transform:scale(.95);}to{opacity:1;transform:scale(1);}}
.fc-answer-btns{display:flex;gap:12px;}
.fc-done{text-align:center;padding:24px 0;display:flex;flex-direction:column;align-items:center;gap:14px;}
.fc-done-emoji{font-size:3rem;}
.fc-done-score{font-family:'Playfair Display',serif;font-size:1.4rem;color:var(--accent);}
.fc-done-stats{display:flex;gap:24px;margin-top:4px;}
.fc-done-stat{text-align:center;}
.fc-done-stat-num{font-family:'Playfair Display',serif;font-size:1.5rem;}
.fc-done-stat-num.g{color:var(--green);}
.fc-done-stat-num.r{color:var(--red);}
.fc-done-stat-lbl{font-size:.6rem;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;}

/* ═══ MUSIC THEORY QUIZ ═══ */
.mtq-setup-label{font-size:.65rem;color:var(--muted);letter-spacing:.1em;text-transform:uppercase;margin-bottom:8px;}
.mtq-mode-row{display:flex;gap:6px;margin-bottom:16px;}
.mtq-topic-grid{display:grid;grid-template-columns:1fr 1fr;gap:6px 8px;margin-bottom:14px;}
@media(max-width:480px){.mtq-topic-grid{grid-template-columns:1fr;}}
.mtq-cat-header{font-size:.56rem;color:var(--muted);letter-spacing:.14em;text-transform:uppercase;padding:10px 2px 5px 2px;border-bottom:1px solid var(--border);margin-bottom:4px;grid-column:1/-1;margin-top:6px;}
.mtq-cat-header:first-child{padding-top:0;margin-top:0;}
.mtq-topic-check{display:flex;align-items:center;gap:8px;background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:9px 12px;cursor:pointer;transition:var(--transition);user-select:none;}
.mtq-topic-check:hover{border-color:var(--accent2);}
.mtq-topic-check.active{border-color:var(--accent);background:rgba(99,102,241,.08);}
.mtq-topic-check input[type=checkbox]{accent-color:var(--accent);width:15px;height:15px;flex-shrink:0;cursor:pointer;pointer-events:none;}
.mtq-topic-label{font-size:.78rem;color:var(--text);flex:1;}
.mtq-topic-count{font-size:.58rem;color:var(--muted);}
.mtq-setup-actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:4px;}
.mtq-no-topic{font-size:.75rem;color:var(--red);padding:6px 0;}
.fc-question{font-family:'Playfair Display',serif;font-size:1.55rem;color:var(--accent);line-height:1.3;text-align:center;}
.fc-answer{font-size:.9rem;color:var(--accent2);line-height:1.65;text-align:center;padding:10px 22px;border:1px solid var(--accent2);border-radius:var(--radius-sm);background:rgba(14,165,233,.06);animation:reveal-in .25s ease;}
.mtq-mc-opts{display:grid;grid-template-columns:1fr 1fr;gap:8px;width:100%;max-width:420px;margin-top:6px;}
@media(max-width:480px){.mtq-mc-opts{grid-template-columns:1fr;}}
.mtq-mc-btn{background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text);font-family:'DM Mono',monospace;font-size:.75rem;padding:12px 10px;cursor:pointer;transition:var(--transition);text-align:center;line-height:1.4;}
.mtq-mc-btn:hover:not([disabled]){border-color:var(--accent);background:rgba(99,102,241,.08);transform:translateY(-1px);}
.mtq-mc-btn.mc-correct{background:rgba(34,211,160,.15);border-color:var(--green)!important;color:var(--green);}
.mtq-mc-btn.mc-wrong{background:rgba(248,113,113,.15);border-color:var(--red)!important;color:var(--red);}

/* ═══ NOTE GUESS ═══ */
.ng-layout{display:grid;grid-template-columns:220px 1fr;gap:20px;align-items:start;}
@media(max-width:600px){.ng-layout{grid-template-columns:1fr;}}
.ng-sidebar{display:flex;flex-direction:column;gap:12px;}
.ng-control-group{display:flex;flex-direction:column;gap:4px;}
.ng-control-label{font-size:.6rem;color:var(--muted);letter-spacing:.1em;text-transform:uppercase;}
.ng-select{width:100%;background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-family:'DM Mono',monospace;font-size:.74rem;padding:7px 10px;outline:none;transition:border-color .2s;}
.ng-select:focus{border-color:var(--accent);}
.ng-stats-box{background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-md);padding:12px;display:grid;grid-template-columns:1fr 1fr 1fr;gap:6px;text-align:center;}
.ng-stat-num{font-family:'Playfair Display',serif;font-size:1.3rem;color:var(--accent);}
.ng-stat-num.g{color:var(--green);}
.ng-stat-num.r{color:var(--red);}
.ng-stat-lbl{font-size:.55rem;color:var(--muted);text-transform:uppercase;letter-spacing:.07em;}
.ng-streak-bar{height:3px;background:var(--border);border-radius:2px;margin-top:6px;overflow:hidden;}
.ng-streak-fill{height:100%;background:linear-gradient(90deg,var(--accent2),var(--accent));border-radius:2px;transition:width .4s;}
.ng-auto-row{display:flex;align-items:center;gap:8px;}
.ng-auto-label{font-size:.65rem;color:var(--muted);}
.ng-staff-wrap{display:flex;flex-direction:column;align-items:center;gap:14px;}
.ng-staff-svg{width:100%;max-width:300px;height:auto;display:block;}
.ng-options{display:grid;grid-template-columns:1fr 1fr;gap:8px;width:100%;max-width:300px;}
.ng-opt-btn{background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text);font-family:'Playfair Display',serif;font-size:1.1rem;padding:12px 6px;cursor:pointer;transition:var(--transition);text-align:center;}
.ng-opt-btn:hover:not([disabled]){border-color:var(--accent);background:rgba(99,102,241,.08);transform:translateY(-1px);}
.ng-opt-btn .note-name{display:block;font-size:1.05rem;color:var(--accent);}
.ng-opt-btn .note-oct{display:block;font-size:.6rem;color:var(--muted);margin-top:2px;}
.ng-opt-btn.correct{background:rgba(34,211,160,.15);border-color:var(--green);}
.ng-opt-btn.correct .note-name{color:var(--green);}
.ng-opt-btn.incorrect{background:rgba(248,113,113,.15);border-color:var(--red);}
.ng-opt-btn.incorrect .note-name{color:var(--red);}
.ng-feedback{font-size:.82rem;text-align:center;min-height:1.6em;font-family:'Playfair Display',serif;}
.ng-start-hint{font-size:.75rem;color:var(--muted);text-align:center;padding:30px 10px;opacity:.55;line-height:1.7;}

/* ═══ INTERVALL-TRAINER ═══ */
.it-piano-wrap{overflow-x:auto;padding:8px 0;display:flex;justify-content:center;}
.it-piano{position:relative;display:inline-flex;height:80px;user-select:none;}
.it-key-w{width:24px;height:80px;background:#f5f5f0;border:1px solid #999;border-radius:0 0 4px 4px;cursor:default;position:relative;flex-shrink:0;transition:background .18s;z-index:1;}
.it-key-b{width:15px;height:50px;background:#1a1a1a;border:1px solid #000;border-radius:0 0 3px 3px;cursor:default;position:absolute;z-index:2;top:0;transition:background .18s;}
.it-key-w.it-note1{background:var(--accent);}
.it-key-w.it-note2{background:var(--accent2);}
.it-key-b.it-note1{background:#4f52c8;}
.it-key-b.it-note2{background:#0b87c4;}
.it-note-labels{display:flex;justify-content:center;gap:16px;font-family:'Playfair Display',serif;font-size:.9rem;min-height:1.8em;margin:4px 0;}
.it-note-label1{color:var(--accent);}
.it-note-label2{color:var(--accent2);}

/* ═══ PATTERN MEMORIZER ═══ */
.pm-seq-display{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:8px;min-height:56px;padding:10px;background:var(--surface2);border-radius:var(--radius-md);border:1px solid var(--border);margin-bottom:10px;}
.pm-dot{width:36px;height:36px;border-radius:50%;background:var(--surface3);border:2px solid var(--border);display:flex;align-items:center;justify-content:center;font-family:'DM Mono',monospace;font-size:.82rem;color:var(--text);transition:var(--transition);flex-shrink:0;}
.pm-dot.active{background:var(--accent);border-color:var(--accent);color:#fff;box-shadow:0 0 12px rgba(99,102,241,.5);}
.pm-dot.correct{background:var(--green);border-color:var(--green);color:#fff;}
.pm-dot.wrong{background:var(--red);border-color:var(--red);color:#fff;}
.pm-dot.pending{background:var(--surface3);border-color:var(--border);color:var(--muted);}
.pm-input-grid{display:flex;flex-wrap:wrap;gap:7px;justify-content:center;margin:8px 0;}
.pm-key-btn{min-width:42px;padding:8px 4px;border-radius:var(--radius-sm);border:1.5px solid var(--border);background:var(--surface2);color:var(--text);font-family:'DM Mono',monospace;font-size:.82rem;cursor:pointer;transition:var(--transition);}
.pm-key-btn:hover{background:var(--surface3);border-color:var(--accent2);transform:translateY(-1px);}
.pm-key-btn:active{background:var(--accent);color:#fff;}
.pm-key-btn:disabled{opacity:.35;cursor:default;}
.pm-key-btn.flash{background:var(--accent);color:#fff;border-color:var(--accent);}
.pm-user-echo{display:flex;gap:6px;flex-wrap:wrap;justify-content:center;min-height:28px;margin:4px 0;font-family:'DM Mono',monospace;font-size:.8rem;color:var(--accent2);}

/* ═══ PIANO VISUALIZER ═══ */
.piano-wrap{overflow-x:auto;padding:10px 0;}
.piano{position:relative;display:inline-flex;height:120px;user-select:none;}
.piano-key-w{width:34px;height:120px;background:#f5f5f0;border:1px solid #999;border-radius:0 0 5px 5px;cursor:pointer;position:relative;flex-shrink:0;transition:background .1s;z-index:1;}
.piano-key-w:hover{background:#ffe8c0;}
.piano-key-w.active{background:var(--accent);}
.piano-key-w.chord-note{background:#ffe090;}
.piano-key-b{width:22px;height:74px;background:#1a1a1a;border:1px solid #000;border-radius:0 0 4px 4px;cursor:pointer;position:absolute;z-index:2;transition:background .1s;top:0;}
.piano-key-b:hover{background:#3a3a3a;}
.piano-key-b.active{background:var(--accent2);}
.piano-key-b.chord-note{background:#2a7a9a;}
.piano-note-label{font-size:8px;color:#888;position:absolute;bottom:5px;left:50%;transform:translateX(-50%);white-space:nowrap;pointer-events:none;}
.piano-controls{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:12px;}
.piano-controls select{background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-family:'DM Mono',monospace;font-size:.76rem;padding:6px 10px;outline:none;cursor:pointer;transition:border-color .2s;}
.piano-controls select:focus{border-color:var(--accent);}
.piano-chord-label{font-family:'Playfair Display',serif;font-size:1rem;color:var(--accent);margin-left:4px;}
.piano-note-readout{font-size:.68rem;color:var(--muted);min-height:1.4em;text-align:center;margin-top:6px;}

/* ═══ LOG ═══ */
.log-entry{background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px;margin-bottom:10px;transition:border-color .2s;}
.log-entry:hover{border-color:var(--border-s);}
.log-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;}
.log-date{font-size:.75rem;color:var(--accent);font-family:'Playfair Display',serif;}
.log-actions{display:flex;gap:6px;}
.log-text{font-size:.78rem;color:var(--text);line-height:1.6;white-space:pre-wrap;word-break:break-word;}
.log-duration{font-size:.65rem;color:var(--muted);margin-top:6px;}
.log-edit-area{width:100%;background:var(--surface3);border:1px solid var(--accent);border-radius:var(--radius-sm);color:var(--text);font-family:'DM Mono',monospace;font-size:.78rem;padding:10px;resize:vertical;min-height:80px;line-height:1.6;outline:none;margin-top:8px;display:none;}
.log-save-btn{display:none;margin-top:6px;}
.log-form{margin-top:16px;padding-top:16px;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:10px;}
.log-grid{grid-template-columns:1fr;}
.log-form textarea,.simple-notes textarea{width:100%;background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-family:'DM Mono',monospace;font-size:.78rem;padding:12px;resize:vertical;min-height:80px;line-height:1.6;outline:none;transition:border-color .2s;}
.log-form textarea:focus{border-color:var(--accent2);}
.log-meta{display:flex;gap:8px;flex-wrap:wrap;}
.log-meta input{flex:1;min-width:120px;background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-family:'DM Mono',monospace;font-size:.78rem;padding:8px 12px;outline:none;transition:border-color .2s;}
.log-meta input::placeholder{color:var(--muted);}
.simple-notes textarea{min-height:90px;}
.simple-notes textarea:focus{border-color:var(--accent);}

/* ═══ LIST ITEMS ═══ */
.item{border-bottom:1px solid var(--border);}
.item:last-child{border-bottom:none;}
.item-row{display:flex;align-items:center;gap:8px;padding:9px 0;}
.check{width:20px;height:20px;border:1.5px solid var(--border-s);border-radius:4px;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:var(--transition);font-size:11px;cursor:pointer;}
.check:hover{border-color:var(--accent);}
.check.done{background:var(--green);border-color:var(--green);color:#0f172a;}
.item-label{font-size:.8rem;color:var(--text);flex:1;line-height:1.4;}
.skill-info-panel{display:none;margin:0 0 10px 28px;background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px 14px;}
.skill-info-panel.open{display:block;}
.skill-info-text{font-size:.74rem;color:var(--text);line-height:1.75;white-space:pre-wrap;}
.skill-info-label{font-size:.58rem;color:var(--accent2);letter-spacing:.1em;text-transform:uppercase;margin-bottom:7px;}

/* ═══ SIDE PANELS ═══ */
.side-panel{position:fixed;top:0;right:0;bottom:0;width:340px;max-width:90vw;background:var(--surface);border-left:1px solid var(--border);z-index:500;display:flex;flex-direction:column;transform:translateX(100%);transition:transform .3s cubic-bezier(.4,0,.2,1);overflow-y:auto;visibility:hidden;backdrop-filter:blur(12px);}
.side-panel.open{transform:translateX(0);visibility:visible;}
.side-panel-header{display:flex;align-items:center;justify-content:space-between;padding:16px 18px;border-bottom:1px solid var(--border);flex-shrink:0;}
.side-panel-title{font-family:'Playfair Display',serif;font-size:1rem;color:var(--accent);}
.side-panel-body{padding:20px 18px;display:flex;flex-direction:column;gap:20px;}
.sp-section{display:flex;flex-direction:column;gap:10px;}
.sp-label{font-size:.65rem;color:var(--muted);letter-spacing:.1em;text-transform:uppercase;}
.theme-swatches{display:flex;gap:8px;flex-wrap:wrap;}
.theme-swatch{width:32px;height:32px;border-radius:50%;border:2px solid transparent;cursor:pointer;transition:var(--transition);position:relative;}
.theme-swatch:hover{transform:scale(1.15);}
.theme-swatch.active{border-color:var(--text);box-shadow:0 0 0 2px var(--bg);}
.theme-swatch::after{content:attr(title);position:absolute;bottom:-22px;left:50%;transform:translateX(-50%);font-size:.55rem;color:var(--muted);white-space:nowrap;pointer-events:none;opacity:0;transition:opacity .2s;}
.theme-swatch:hover::after{opacity:1;}
.lang-row{display:flex;gap:8px;}
.lang-btn{flex:1;background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--muted);font-family:'DM Mono',monospace;font-size:.75rem;padding:8px;cursor:pointer;transition:var(--transition);text-align:center;}
.lang-btn.active{border-color:var(--accent);color:var(--accent);background:rgba(99,102,241,.1);}
.notation-toggle{display:flex;gap:6px;margin-top:4px;flex-wrap:wrap;}
.notation-btn{flex:1;background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--muted);font-family:'DM Mono',monospace;font-size:.72rem;padding:7px 6px;cursor:pointer;transition:var(--transition);text-align:center;min-width:80px;}
.notation-btn:hover{border-color:var(--border-s);color:var(--text);}
.notation-btn.active{border-color:var(--accent);color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,transparent);}
.sb-theory-pct{font-size:.58rem;font-family:'DM Mono',monospace;color:var(--muted);margin-left:auto;padding-right:2px;flex-shrink:0;transition:color .3s;line-height:1;}
.sb-theory-pct.done{color:var(--green);}
#sidebar.collapsed .sb-theory-pct{display:none;}
.sp-btn-row{display:flex;gap:8px;flex-wrap:wrap;}
#updatesTextarea{width:100%;background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-family:'DM Mono',monospace;font-size:.78rem;padding:12px;resize:vertical;min-height:300px;line-height:1.6;outline:none;transition:border-color .2s;}
#updatesTextarea:focus{border-color:var(--accent2);}
.side-panel-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5);backdrop-filter:blur(4px);z-index:490;display:none;}
.side-panel-overlay.open{display:block;}

/* ═══ CONFETTI ═══ */
.confetti-burst{position:fixed;top:0;left:0;right:0;height:0;pointer-events:none;z-index:9999;overflow:visible;}
.confetti-burst span{position:absolute;animation:confetti-fall 1.8s ease-in forwards;}
@keyframes confetti-fall{0%{transform:translateY(-10px) rotate(0deg);opacity:1;}100%{transform:translateY(90vh) rotate(720deg);opacity:0;}}

/* ═══ THEORY CATEGORY HEADERS ═══ */
.theory-category{font-size:.6rem;color:var(--muted);letter-spacing:.16em;text-transform:uppercase;padding:18px 2px 8px 2px;border-bottom:1px solid var(--border);margin-bottom:12px;}
.theory-category:first-child{padding-top:0;}
.list-cat-hd{font-size:.58rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);padding:10px 0 4px 0;margin-top:10px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:5px;}
.list-cat-hd:first-child{margin-top:0;}
.list-cat-hd .lch-dot{width:6px;height:6px;border-radius:50%;background:var(--muted);flex-shrink:0;}
.list-cat-hd.preset .lch-dot{background:var(--accent2);}

/* ═══ THEORY VISUALIZATION ═══ */
.viz-desc{font-size:.74rem;color:var(--text);line-height:1.75;margin-bottom:14px;}
.triad-viz{display:flex;align-items:center;gap:8px;margin:12px 0;flex-wrap:wrap;}
.triad-note{background:var(--bg);border:1px solid var(--accent);border-radius:var(--radius-sm);padding:10px 16px;font-family:'Playfair Display',serif;font-size:1.15rem;color:var(--accent);text-align:center;min-width:48px;}
.triad-interval{display:flex;flex-direction:column;align-items:center;gap:2px;}
.triad-arrow{color:var(--muted);font-size:.75rem;}
.triad-steps{font-size:.58rem;color:var(--accent2);letter-spacing:.06em;white-space:nowrap;}
.func-band{display:flex;gap:6px;margin:12px 0;flex-wrap:wrap;}
.func-cell{flex:1;min-width:60px;padding:10px 6px;text-align:center;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg);}
.func-cell.tonic{background:rgba(34,211,160,.1);border-color:rgba(34,211,160,.3);}
.func-cell.subdom{background:rgba(14,165,233,.1);border-color:rgba(14,165,233,.3);}
.func-cell.dom{background:rgba(99,102,241,.1);border-color:rgba(99,102,241,.3);}
.func-cell-tag{font-size:.54rem;letter-spacing:.1em;text-transform:uppercase;margin-bottom:5px;}
.func-cell.tonic .func-cell-tag{color:var(--green);}
.func-cell.subdom .func-cell-tag{color:var(--accent2);}
.func-cell.dom .func-cell-tag{color:var(--accent);}
.func-cell-roman{font-family:'Playfair Display',serif;font-size:.9rem;color:var(--text);display:block;}
.func-cell-chord{font-size:.65rem;color:var(--muted);margin-top:3px;display:block;}
.cadence-flows{display:flex;flex-direction:column;gap:10px;margin:12px 0;}
.cad-row{display:flex;align-items:center;gap:8px;flex-wrap:wrap;}
.cad-type{font-size:.62rem;color:var(--muted);width:88px;flex-shrink:0;text-transform:uppercase;letter-spacing:.07em;}
.cad-chord{background:var(--bg);border:1px solid var(--border);border-radius:6px;padding:5px 11px;font-family:'Playfair Display',serif;font-size:.85rem;color:var(--text);text-align:center;}
.cad-chord.resolve{border-color:var(--accent);color:var(--accent);}
.cad-chord.tension{border-color:var(--accent2);color:var(--accent2);}
.cad-arrow{color:var(--muted);font-size:.8rem;}
.cad-effect{font-size:.6rem;color:var(--muted);font-style:italic;}
.mode-grid{display:flex;flex-direction:column;gap:6px;margin:12px 0;}
.mode-row{display:flex;align-items:center;gap:5px;}
.mode-name{font-size:.68rem;color:var(--accent);width:92px;flex-shrink:0;font-family:'Playfair Display',serif;}
.mode-steps{display:flex;gap:2px;align-items:center;flex:1;}
.step-w{height:18px;width:26px;background:rgba(14,165,233,.5);border-radius:3px;flex-shrink:0;}
.step-h{height:18px;width:13px;background:rgba(99,102,241,.7);border-radius:3px;flex-shrink:0;}
.mode-char{font-size:.6rem;color:var(--muted);margin-left:6px;font-style:italic;}
.int-bars{display:flex;flex-direction:column;gap:5px;margin:12px 0;}
.int-bar-row{display:flex;align-items:center;gap:8px;}
.int-bar-name{font-size:.67rem;color:var(--text);width:96px;flex-shrink:0;}
.int-bar-track{flex:1;height:14px;background:var(--bg);border-radius:3px;overflow:hidden;}
.int-bar-fill{height:100%;border-radius:3px;background:linear-gradient(90deg,var(--accent2),var(--accent));opacity:.8;}
.int-bar-ht{font-size:.6rem;color:var(--muted);width:32px;text-align:right;flex-shrink:0;}
.rhythm-bars{display:flex;flex-direction:column;gap:5px;margin:12px 0;}
.rhythm-bar-row{display:flex;align-items:center;gap:8px;}
.rhythm-bar-name{font-size:.67rem;color:var(--text);width:80px;flex-shrink:0;}
.rhythm-bar-track{flex:1;height:16px;background:var(--bg);border-radius:3px;overflow:hidden;}
.rhythm-bar-fill{height:100%;border-radius:3px;background:linear-gradient(90deg,var(--accent2),var(--accent));opacity:.8;}
.rhythm-bar-val{font-size:.6rem;color:var(--muted);width:52px;text-align:right;flex-shrink:0;}
.form-diagrams{display:flex;flex-direction:column;gap:10px;margin:12px 0;}
.form-diagram-row{display:flex;align-items:center;gap:4px;flex-wrap:wrap;}
.form-diagram-label{font-size:.63rem;color:var(--muted);width:84px;flex-shrink:0;}
.fb{padding:5px 11px;border-radius:5px;font-size:.72rem;text-align:center;font-family:'Playfair Display',serif;}
.fb.a{background:rgba(99,102,241,.2);color:var(--accent);border:1px solid rgba(99,102,241,.4);}
.fb.b{background:rgba(14,165,233,.2);color:var(--accent2);border:1px solid rgba(14,165,233,.4);}
.fb.c{background:rgba(34,211,160,.2);color:var(--green);border:1px solid rgba(34,211,160,.4);}
.fb.dev{background:rgba(248,113,113,.15);color:var(--red);border:1px solid rgba(248,113,113,.35);font-size:.63rem;}
.fb.rep{background:rgba(99,102,241,.1);color:var(--accent);border:1px solid rgba(99,102,241,.25);font-size:.63rem;}
.fb.coda{background:rgba(167,139,250,.15);color:var(--purple);border:1px solid rgba(167,139,250,.35);font-size:.63rem;}
.dyn-bar-section{margin:12px 0;}
.dyn-bar{height:22px;border-radius:6px;background:linear-gradient(90deg,rgba(14,165,233,.25) 0%,rgba(14,165,233,.5) 16%,rgba(99,102,241,.5) 50%,rgba(99,102,241,.9) 83%,rgba(99,102,241,1) 100%);}
.dyn-bar-labels{display:flex;justify-content:space-between;margin-top:5px;}
.dyn-bar-lbl{font-family:'Playfair Display',serif;font-size:.82rem;color:var(--text);}
.qz-svg-wrap{display:flex;justify-content:center;margin:12px 0;}
#qzSvg{max-width:280px;width:100%;height:auto;}
.qz-seg{stroke:var(--bg);stroke-width:2;cursor:default;transition:opacity .15s;}
.qz-seg:hover{opacity:.85;}
.qz-seg-text{font-size:11px;font-family:'Playfair Display',serif;fill:var(--bg);font-weight:bold;pointer-events:none;}
.qz-seg-minor{font-size:8px;fill:rgba(0,0,0,.6);pointer-events:none;}

/* ═══ GLOBAL SEARCH ═══ */
.topbar-search-wrap{position:relative;display:flex;align-items:center;}
.topbar-search-icon{position:absolute;left:9px;color:var(--muted);pointer-events:none;width:14px;height:14px;flex-shrink:0;}
.topbar-search{background:rgba(30,41,59,.8);border:1px solid var(--border);border-radius:20px;color:var(--text);font-family:'DM Mono',monospace;font-size:.72rem;padding:5px 12px 5px 30px;width:160px;outline:none;transition:border-color .2s,width .25s,box-shadow .2s;-webkit-appearance:none;}
.topbar-search:focus{border-color:var(--accent);width:210px;box-shadow:0 0 0 3px rgba(99,102,241,.15);}
.topbar-search::placeholder{color:var(--muted);}
.topbar-search::-webkit-search-cancel-button{-webkit-appearance:none;}
@media(max-width:500px){.topbar-search{width:110px;}.topbar-search:focus{width:140px;}}
.search-results{position:fixed;top:var(--topbar-h);left:0;right:0;z-index:300;background:var(--surface);border-bottom:1px solid var(--border);max-height:55vh;overflow-y:auto;display:none;box-shadow:var(--shadow-lg);backdrop-filter:blur(16px);}
.search-results.open{display:block;}
.search-result-item{display:flex;gap:10px;align-items:baseline;padding:10px 22px;cursor:pointer;border-bottom:1px solid var(--border);transition:background .1s;}
.search-result-item:last-child{border-bottom:none;}
.search-result-item:hover,.search-result-item.sr-active{background:var(--surface2);}
.search-result-cat{font-size:.55rem;color:var(--muted);text-transform:uppercase;letter-spacing:.1em;white-space:nowrap;flex-shrink:0;min-width:80px;}
.search-result-label{font-size:.78rem;color:var(--text);flex:1;line-height:1.4;}
.search-result-label em{color:var(--accent);font-style:normal;}
.search-empty{padding:14px 22px;font-size:.78rem;color:var(--muted);}

/* ═══ INVERSIONS ═══ */
.inv-viz{display:flex;gap:18px;flex-wrap:wrap;margin:14px 0;}
.inv-chord{display:flex;flex-direction:column;align-items:center;gap:6px;flex:1;min-width:72px;}
.inv-chord-label{font-size:.6rem;color:var(--muted);text-transform:uppercase;letter-spacing:.1em;text-align:center;line-height:1.4;}
.inv-notes{display:flex;flex-direction:column-reverse;gap:3px;}
.inv-note{background:var(--bg);border:1px solid var(--border);border-radius:6px;padding:5px 10px;font-size:.76rem;color:var(--text);text-align:center;min-width:58px;transition:border-color .15s;}
.inv-note.inv-bass{border-color:var(--accent);color:var(--accent);font-weight:500;}
.inv-chord-notation{font-size:.65rem;color:var(--accent2);letter-spacing:.05em;background:rgba(14,165,233,.08);border:1px solid rgba(14,165,233,.25);border-radius:5px;padding:2px 7px;}
.inv-rule{font-size:.7rem;color:var(--text);line-height:1.6;background:var(--surface2);border-left:2px solid var(--accent);padding:8px 12px;border-radius:0 6px 6px 0;margin:10px 0;}

/* ═══ SEVENTH CHORD TABLE ═══ */
.data-table-wrap{width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;margin:14px 0;border-radius:var(--radius-md);border:1px solid var(--border);background:rgba(15,23,42,.4);}
.seventh-table,.data-table{width:100%;border-collapse:separate;border-spacing:0 4px;}
.seventh-table th,.data-table th{font-size:.58rem;color:var(--muted);text-transform:uppercase;letter-spacing:.1em;padding:6px 10px;text-align:left;font-weight:400;}
.seventh-table td,.data-table td{font-size:.73rem;padding:8px 10px;background:var(--bg);border-top:1px solid var(--border);border-bottom:1px solid var(--border);vertical-align:middle;line-height:1.4;white-space:normal;word-break:break-word;}
.seventh-table tr:nth-child(even) td,.data-table tr:nth-child(even) td{background:rgba(30,41,59,.7);}
.seventh-table tr:nth-child(odd) td,.data-table tr:nth-child(odd) td{background:rgba(15,23,42,.5);}
.seventh-table td:first-child,.data-table td.col-key{border-left:1px solid var(--border);border-radius:6px 0 0 6px;color:var(--accent);font-weight:600;white-space:nowrap;min-width:85px;}
.seventh-table td:last-child{border-right:1px solid var(--border);border-radius:0 6px 6px 0;color:var(--muted);font-size:.68rem;}
.seventh-table tr.dom7-row td{}
.seventh-sym{font-size:.7rem;color:var(--accent2);background:rgba(14,165,233,.1);border-radius:4px;padding:1px 5px;font-family:'DM Mono',monospace;}

/* ═══ EXTENDED CHORDS ═══ */
.extended-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px;margin:12px 0;}
.extended-card{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 12px;display:flex;flex-direction:column;gap:2px;transition:var(--transition);}
.extended-card:hover{border-color:var(--accent);transform:translateY(-1px);box-shadow:var(--shadow-sm);}
.extended-card-name{font-size:.73rem;color:var(--text);font-weight:500;}
.extended-card-sym{font-size:.68rem;color:var(--accent);font-family:'DM Mono',monospace;}
.extended-card-notes{font-size:.63rem;color:var(--muted);}
.extended-card-char{font-size:.6rem;color:var(--text);margin-top:2px;font-style:italic;line-height:1.4;}
.sus-rule-box{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:10px 0;}
.sus-rule-half{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);padding:9px 12px;}
.sus-rule-half-title{font-size:.62rem;color:var(--accent);font-weight:500;text-transform:uppercase;letter-spacing:.08em;margin-bottom:4px;}
.sus-rule-half-body{font-size:.68rem;color:var(--text);line-height:1.5;}

/* ═══ SECONDARY DOMINANTS ═══ */
.secdom-flow{display:flex;flex-direction:column;gap:7px;margin:12px 0;}
.secdom-row{display:grid;grid-template-columns:90px 18px 80px 1fr;align-items:center;gap:6px;}
.secdom-source{background:var(--bg);border:1px solid rgba(99,102,241,.4);border-radius:6px;padding:5px 8px;font-size:.7rem;color:var(--accent2);text-align:center;font-family:'DM Mono',monospace;}
.secdom-arrow{color:var(--muted);font-size:.9rem;text-align:center;}
.secdom-target{background:var(--surface2);border:1px solid var(--border);border-radius:6px;padding:5px 8px;font-size:.7rem;color:var(--text);text-align:center;}
.secdom-function{font-size:.62rem;color:var(--muted);line-height:1.4;}

/* ═══ MINI PIANO ═══ */
.mini-piano-wrap{margin:12px 0 4px;}
.mini-piano-row{display:flex;align-items:center;gap:10px;margin-bottom:8px;}
.mini-piano-tag{font-size:.6rem;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;width:70px;flex-shrink:0;line-height:1.3;}
.mini-piano-svg{flex:1;}

/* ═══ KEY SIGNATURES ═══ */
.keysig-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:12px 0;}
.keysig-col-title{font-size:.6rem;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;padding:0 0 4px 0;border-bottom:1px solid var(--border);margin-bottom:4px;}
.keysig-row{display:flex;align-items:baseline;gap:6px;padding:4px 0;border-bottom:1px solid rgba(255,255,255,.03);font-size:.7rem;}
.keysig-row:last-child{border-bottom:none;}
.keysig-key{color:var(--text);font-weight:500;min-width:36px;}
.keysig-signs{font-family:'DM Mono',monospace;font-size:.65rem;flex:1;}
.keysig-sharp{color:var(--accent);}
.keysig-flat{color:var(--accent2);}
.keysig-parallel{font-size:.57rem;color:var(--muted);}
.keysig-none{font-size:.62rem;color:var(--muted);font-style:italic;}

/* ═══ TEMPO ═══ */
.tempo-track{height:16px;border-radius:8px;background:linear-gradient(to right,#6b9bd2 0%,var(--accent2) 28%,var(--green) 50%,var(--accent) 72%,var(--red) 100%);margin:8px 0 4px;}
.tempo-bpm-labels{display:flex;justify-content:space-between;font-size:.55rem;color:var(--muted);font-family:'DM Mono',monospace;margin-bottom:12px;}
.tempo-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:6px;margin-top:6px;}
.tempo-card{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 10px;display:flex;flex-direction:column;gap:1px;border-left:3px solid transparent;transition:var(--transition);}
.tempo-card:hover{border-color:var(--border-s);}
.tempo-card.tc-slow{border-left-color:#6b9bd2;}
.tempo-card.tc-med{border-left-color:var(--green);}
.tempo-card.tc-fast{border-left-color:var(--accent);}
.tempo-card.tc-vfast{border-left-color:var(--red);}
.tempo-card-name{font-size:.76rem;color:var(--text);font-weight:500;font-style:italic;}
.tempo-card-bpm{font-size:.58rem;color:var(--accent);font-family:'DM Mono',monospace;}
.tempo-card-desc{font-size:.58rem;color:var(--muted);margin-top:1px;}

/* ═══ GUITAR CHORD DIAGRAMS ═══ */
.guitar-chord-diagram{display:inline-flex;flex-direction:column;align-items:center;gap:3px;padding:8px 10px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-md);cursor:default;transition:var(--transition);}
.guitar-chord-diagram:hover{border-color:var(--accent);box-shadow:var(--shadow-sm);}
.guitar-chords-wrap{display:flex;flex-wrap:wrap;gap:10px;margin:10px 0;}
.theory-chords-collapsible{margin-top:8px;}
.theory-chords-toggle{background:none;border:1px solid var(--border);border-radius:var(--radius-sm);padding:4px 12px;font-size:.68rem;color:var(--accent);cursor:pointer;font-family:'DM Mono',monospace;transition:var(--transition);}
.theory-chords-toggle:hover{border-color:var(--accent);background:rgba(99,102,241,.08);}
.theory-chords-body{display:none;margin-top:8px;}
.theory-chords-body.open{display:block;}

/* ═══ THEORY TABS & PROGRESS (v10.1.0) ═══ */
.theory-progress-label{display:flex;justify-content:space-between;align-items:center;font-size:.62rem;color:var(--muted);text-transform:uppercase;letter-spacing:.1em;margin-bottom:6px;}
#theoryProgressPct{color:var(--accent2);font-family:'DM Mono',monospace;font-weight:500;}

/* Lesson Done Button — injiziert in theory-header/sub-section-header */
.lesson-done-btn{
  background:none;border:1px solid var(--border-s);border-radius:20px;
  color:var(--muted);font-size:.6rem;font-family:'DM Mono',monospace;
  padding:2px 8px;cursor:pointer;transition:var(--transition);white-space:nowrap;
  margin-left:auto;flex-shrink:0;
}
.lesson-done-btn:hover{border-color:var(--green);color:var(--green);}
.lesson-done-btn.done{background:rgba(34,211,160,.12);border-color:var(--green);color:var(--green);}


/* ═══ INTERACTIVE TOOLS (v10.1.0) ═══ */
/* Note Slider — Reiter 1 */
.note-slider-wrap{background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px 18px;margin:14px 0;}
.note-slider-staff-area{display:flex;flex-direction:column;align-items:center;gap:16px;}
.note-slider-svg{width:100%;max-width:340px;display:block;cursor:pointer;}
.note-slider-info{display:flex;flex-direction:column;align-items:center;gap:6px;text-align:center;}
.note-slider-name{font-family:'Playfair Display',serif;font-size:2.8rem;color:var(--accent);line-height:1;transition:color .2s;}
.note-slider-oct{font-size:.7rem;color:var(--muted);letter-spacing:.1em;}
.note-slider-desc{font-size:.72rem;color:var(--text-dim);max-width:240px;line-height:1.6;}
.note-slider-nav{display:flex;align-items:center;gap:16px;margin-top:4px;}
.note-slider-btn{background:var(--surface3);border:1px solid var(--border-s);border-radius:50%;width:36px;height:36px;color:var(--accent);font-size:1.1rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:var(--transition);flex-shrink:0;}
.note-slider-btn:hover{background:var(--accent);color:#fff;transform:scale(1.08);}
.note-slider-keyboard{display:flex;justify-content:center;margin-top:12px;}

/* Halftone Explainer — Reiter 2 */
.halftone-wrap{background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px 18px;margin:14px 0;}
.halftone-piano{overflow-x:auto;display:flex;justify-content:center;padding:8px 0;}
.halftone-legend{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:10px;font-size:.68rem;color:var(--text-dim);}
.halftone-legend-item{display:flex;align-items:center;gap:5px;}
.halftone-legend-dot{width:12px;height:12px;border-radius:3px;flex-shrink:0;}

/* CAGED Explorer — Reiter 3 */
.caged-wrap{background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px 18px;margin:14px 0;}
.caged-selector{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:16px;justify-content:center;}
.caged-btn{background:var(--surface3);border:2px solid var(--border);border-radius:var(--radius-sm);color:var(--muted);font-family:'Playfair Display',serif;font-size:1rem;padding:8px 16px;cursor:pointer;transition:var(--transition);}
.caged-btn:hover{border-color:var(--accent2);color:var(--text);}
.caged-btn.active{border-color:var(--accent);color:var(--accent);background:rgba(99,102,241,.1);box-shadow:0 0 12px rgba(99,102,241,.2);}
.caged-fretboard-svg{width:100%;max-width:420px;display:block;margin:0 auto;}
.caged-info{margin-top:14px;padding:12px 14px;background:var(--bg);border-left:3px solid var(--accent);border-radius:0 var(--radius-sm) var(--radius-sm) 0;font-size:.74rem;color:var(--text);line-height:1.7;}
.caged-info-title{font-family:'Playfair Display',serif;font-size:.9rem;color:var(--accent);margin-bottom:4px;}

/* Fretboard Explorer hover tooltip */
.fretboard-explorer-wrap{position:relative;margin:14px 0;}
.fretboard-explorer-svg{width:100%;max-width:440px;display:block;cursor:crosshair;}
.fretboard-tooltip{position:absolute;background:var(--surface3);border:1px solid var(--accent2);border-radius:var(--radius-sm);color:var(--accent2);font-family:'Playfair Display',serif;font-size:.88rem;padding:4px 10px;pointer-events:none;opacity:0;transition:opacity .15s;z-index:50;white-space:nowrap;}
.fretboard-tooltip.visible{opacity:1;}

/* Rhythm Raster — Reiter 1 */
.rhythm-raster-wrap{background:var(--surface2);border:1px solid var(--border);border-radius:var(--radius-lg);padding:18px;margin:14px 0;}
.rhythm-raster-grid{display:flex;gap:5px;flex-wrap:wrap;margin:10px 0;}
.rhythm-cell{height:38px;min-width:32px;flex:1;background:var(--bg);border:1.5px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;transition:var(--transition);position:relative;display:flex;align-items:center;justify-content:center;}
.rhythm-cell.beat-active{background:var(--accent);border-color:var(--accent);box-shadow:0 0 10px rgba(99,102,241,.5);}
.rhythm-cell.beat-sub{background:var(--accent2);border-color:var(--accent2);box-shadow:0 0 8px rgba(14,165,233,.4);}
.rhythm-cell.beat-flash{animation:cell-flash .15s ease;}
@keyframes cell-flash{0%{transform:scale(1.18);box-shadow:0 0 18px var(--accent);}100%{transform:scale(1);}}
.rhythm-raster-controls{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-top:10px;}

/* ═══ NOTATION CONTAINER ═══ */
/* Vorbereitete Utility-Klassen — aktuell von keinem HTML-Element genutzt.
   Für künftige Notations-Renderer (z.B. VexFlow) vorgesehen. */
.notation-scroll-wrap{width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;margin:16px 0;padding:4px;}
.vf-responsive{display:block;height:auto;max-width:100%;margin:0 auto;}

/* ─── Responsive ─── */
@media(max-width:479px){
  :root{--topbar-h:48px;}
  #sidebar{width:0;border-right:none;transform:translateX(-100%);transition:transform .25s,width .25s;}
  #sidebar.mobile-open{width:220px;transform:translateX(0);box-shadow:4px 0 32px rgba(0,0,0,.6);}
  #mainContent{margin-left:0 !important;padding:14px 12px;padding-top:calc(var(--topbar-h) + 14px);}
  .sections-grid{grid-template-columns:1fr;gap:12px;}
  .card{padding:14px 12px;}
  .sub-section{padding:10px;}
  .theory-title{font-size:.78rem;}
  .extended-grid{grid-template-columns:1fr 1fr;}
  .seventh-table th,.seventh-table td{font-size:.72rem;padding:8px 6px;}
  .inv-viz{gap:8px;}
  .inv-note{padding:4px 6px;font-size:.68rem;min-width:42px;}
  .secdom-row{grid-template-columns:78px 14px 68px 1fr;font-size:.65rem;}
  .tempo-grid{grid-template-columns:1fr 1fr;}
  .fc-card{min-height:150px;}
  .mtq-mc-opts{grid-template-columns:1fr;}
  .keysig-grid{grid-template-columns:1fr;}
  .sus-rule-box{grid-template-columns:1fr;}
  .topbar-search{width:90px;}
  .topbar-search:focus{width:120px;}
  .topbar-appname{display:none;}
  .piece-row{flex-wrap:wrap;}
}
@media(min-width:480px) and (max-width:759px){
  :root{--topbar-h:50px;}
  #sidebar{width:56px;}
  #mainContent{margin-left:56px;padding:20px 16px;padding-top:calc(var(--topbar-h) + 20px);}
  .sections-grid{grid-template-columns:1fr;gap:14px;}
  .card{padding:16px 14px;}
  .extended-grid{grid-template-columns:1fr 1fr;}
  .keysig-grid{grid-template-columns:1fr;}
  .sus-rule-box{grid-template-columns:1fr;}
  .tempo-grid{grid-template-columns:1fr 1fr;}
  .topbar-search{width:110px;}
  .topbar-search:focus{width:150px;}
}
@media(min-width:760px) and (max-width:1099px){
  .sections-grid{grid-template-columns:1fr;max-width:720px;}
  #sidebar{width:180px;}
  #sidebar.collapsed{width:56px;}
  #mainContent{margin-left:180px;}
  #sidebar.collapsed~#mainContent,#app.sidebar-collapsed #mainContent{margin-left:56px;}
  .extended-grid{grid-template-columns:repeat(3,1fr);}
  .tempo-grid{grid-template-columns:repeat(3,1fr);}
}
@media(min-width:1100px){
  .sections-grid{grid-template-columns:1fr 1fr;}
  .extended-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));}
  .tempo-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));}
}
@media(max-width:759px) and (orientation:landscape){
  :root{--topbar-h:42px;}
  #mainContent{padding-top:calc(var(--topbar-h) + 10px);padding-bottom:10px;}
  .fc-card{min-height:120px;}
  .ng-staff-svg{max-width:200px;}
}
#sidebarOverlay{display:none;position:fixed;inset:0;z-index:99;background:rgba(0,0,0,.6);backdrop-filter:blur(4px);}
body.xs #sidebarOverlay.open{display:block;}
#vpChip{display:none;position:fixed;bottom:8px;right:8px;z-index:9999;background:var(--surface3);border:1px solid var(--border-s);border-radius:20px;font-family:'DM Mono',monospace;font-size:.55rem;color:var(--muted);padding:2px 8px;letter-spacing:.08em;pointer-events:none;}

/* ═══ PRIMÄRE NAVIGATION (v10.3.0) ═══ */
.primary-nav{
  display:flex;
  align-items:stretch;
  background:var(--surface);
  border-bottom:1px solid var(--border);
  position:sticky;
  top:48px;
  z-index:100;
  overflow-x:auto;
  scrollbar-width:none;
}
.primary-nav::-webkit-scrollbar{display:none;}
.nav-tab{
  flex:1;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:3px;
  padding:8px 6px 6px;
  background:none;
  border:none;
  border-bottom:2px solid transparent;
  color:var(--muted);
  cursor:pointer;
  transition:color .15s, border-color .15s;
  font-family:'DM Mono',monospace;
  font-size:.58rem;
  letter-spacing:.04em;
  text-transform:uppercase;
  min-width:56px;
  position:relative;
  white-space:nowrap;
}
.nav-tab:hover{color:var(--text);}
.nav-tab.active{color:var(--accent);border-bottom-color:var(--accent);}
.nav-tab-icon{width:20px;height:20px;display:flex;align-items:center;justify-content:center;}
.nav-tab-icon svg{width:18px;height:18px;stroke:currentColor;stroke-width:1.5;}
.nav-tab-label{font-size:.55rem;letter-spacing:.06em;}
.nav-tab-badge{
  position:absolute;
  top:6px;right:calc(50% - 18px);
  background:var(--accent);
  color:var(--bg);
  font-size:.45rem;
  font-family:'DM Mono',monospace;
  padding:1px 4px;
  border-radius:8px;
  line-height:1.4;
  min-width:14px;
  text-align:center;
}

/* ═══ PAGES ═══ */
.app-main{
  max-width:980px;
  margin:0 auto;
  padding:0 0 80px;
}
.page{display:none;}
.page.active{display:block;}
.page-inner{padding:16px;}
.page-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin-bottom:16px;
  padding-bottom:12px;
  border-bottom:1px solid var(--border);
  gap:12px;
  flex-wrap:wrap;
}
.page-title{
  font-family:'Playfair Display',serif;
  font-size:1.4rem;
  color:var(--accent);
  margin:0;
  flex:1;
}

/* ═══ TOPBAR ACTIONS ═══ */
.topbar-actions{display:flex;gap:6px;margin-left:auto;}
.topbar-btn{
  background:none;
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  color:var(--muted);
  cursor:pointer;
  padding:5px 7px;
  display:flex;
  align-items:center;
  justify-content:center;
  transition:color .15s, border-color .15s;
}
.topbar-btn:hover{color:var(--accent);border-color:var(--accent);}
.topbar-btn svg{width:15px;height:15px;stroke:currentColor;stroke-width:1.5;}

/* ═══ FILTER PANEL ═══ */
.filter-panel{
  display:none;
  background:var(--surface2);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  padding:12px 14px;
  margin-bottom:14px;
  gap:10px;
  flex-wrap:wrap;
  align-items:flex-start;
}
.filter-panel.open{display:flex;}
.filter-status-row,.filter-tags-row{display:flex;gap:6px;flex-wrap:wrap;}
#filterToggleBtn.active{border-color:var(--accent);color:var(--accent);}

/* ═══ TOOL NAVIGATION ═══ */
.tool-nav{
  display:flex;
  gap:6px;
  flex-wrap:wrap;
  margin-bottom:16px;
  padding-bottom:12px;
  border-bottom:1px solid var(--border);
}
.tool-tab{
  background:var(--surface2);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  color:var(--muted);
  font-family:'DM Mono',monospace;
  font-size:.65rem;
  padding:6px 10px;
  cursor:pointer;
  transition:var(--transition);
  white-space:nowrap;
}
.tool-tab:hover{border-color:var(--border-s);color:var(--text);}
.tool-tab.active{border-color:var(--accent);color:var(--accent);background:color-mix(in srgb,var(--accent) 10%,transparent);}
.tool-panel{display:none;}
.tool-panel.active{display:block;}

/* ═══ THEORY TABS ═══ */
.theory-tabs{
  display:flex;
  gap:0;
  margin-bottom:18px;
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  overflow:hidden;
  background:var(--surface2);
}
.theory-tab{
  flex:1;
  background:none;
  border:none;
  color:var(--muted);
  font-family:'DM Mono',monospace;
  font-size:.68rem;
  padding:9px 8px;
  cursor:pointer;
  transition:background .15s,color .15s;
  text-align:center;
}
.theory-tab:not(:last-child){border-right:1px solid var(--border);}
.theory-tab:hover{background:var(--surface3);color:var(--text);}
.theory-tab.active{background:var(--surface3);color:var(--accent);}

/* ═══ THEORY PROGRESS ═══ */
.theory-progress-wrap{display:flex;align-items:center;gap:8px;}
.theory-progress-bar-bg{flex:1;height:5px;background:var(--surface3);border-radius:3px;overflow:hidden;min-width:60px;}
.theory-progress-bar{height:100%;background:var(--accent);border-radius:3px;transition:width .4s ease;}
.theory-progress-pct{font-size:.65rem;font-family:'DM Mono',monospace;color:var(--muted);min-width:28px;text-align:right;}

/* ═══ JOURNAL TABS ═══ */
.journal-tabs{
  display:flex;
  gap:0;
  margin-bottom:16px;
  border-bottom:2px solid var(--border);
}
.journal-tab{
  background:none;
  border:none;
  border-bottom:2px solid transparent;
  margin-bottom:-2px;
  color:var(--muted);
  font-family:'DM Mono',monospace;
  font-size:.7rem;
  padding:8px 14px;
  cursor:pointer;
  transition:color .15s, border-color .15s;
}
.journal-tab:hover{color:var(--text);}
.journal-tab.active{color:var(--accent);border-bottom-color:var(--accent);}
.journal-panel{display:none;}
.journal-panel.active{display:block;}

/* ═══ THEORIE-BADGE ═══ */
.nav-tab-badge:empty{display:none;}