:root{--bg:var(--bg-primary);--panel:var(--bg-secondary);--panel2:var(--bg-tertiary);--line:var(--border-subtle);--line2:var(--border-light);--text:var(--text-primary);--muted:var(--text-muted);--cyan:var(--accent-cyan);--violet:var(--accent-purple);--amber:var(--accent-amber);--green:var(--accent-green);--shadow:var(--shadow-lg)}
*{box-sizing:border-box}html,body{height:100%;margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;overflow:hidden}button{font:inherit;color:inherit}.studio-shell{height:100vh;display:grid;grid-template-columns:84px minmax(0,1fr);background:radial-gradient(circle at 75% -20%,rgba(0,240,255,.08),transparent 34%),radial-gradient(circle at 15% 105%,rgba(179,102,255,.09),transparent 34%),var(--bg)}
.studio-rail{display:flex;flex-direction:column;align-items:center;padding:14px 10px;border-right:1px solid var(--line);background:rgba(7,10,14,.94);backdrop-filter:blur(18px);z-index:3}.brand{text-decoration:none;color:white;display:flex;flex-direction:column;align-items:center;gap:4px;margin:2px 0 22px}.brand-mark{display:grid;place-items:center;width:42px;height:42px;border:1px solid rgba(0,240,255,.5);border-radius:13px;background:linear-gradient(145deg,rgba(0,240,255,.18),rgba(179,102,255,.12));font-weight:900;box-shadow:inset 0 0 18px rgba(0,240,255,.08),0 8px 22px rgba(0,0,0,.35)}.brand-word{font-size:9px;letter-spacing:.25em;color:var(--muted);font-weight:800}.mode-nav{width:100%;display:grid;gap:8px}.mode-button,.rail-action{border:0;background:transparent;color:#718095;border-radius:13px;min-height:60px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;cursor:pointer;transition:.2s ease;position:relative}.mode-button span:last-child,.rail-action span:last-child{font-size:10px;font-weight:750}.mode-icon{font-size:22px;line-height:1}.mode-button:hover,.rail-action:hover{color:#dbeafe;background:#101722}.mode-button.is-active{color:#fff;background:linear-gradient(145deg,rgba(0,240,255,.13),rgba(179,102,255,.11));box-shadow:inset 0 0 0 1px rgba(0,240,255,.24)}.mode-button.is-active:before{content:"";position:absolute;left:-10px;width:3px;height:28px;border-radius:0 4px 4px 0;background:var(--cyan);box-shadow:0 0 14px var(--cyan)}.rail-spacer{flex:1}.rail-action[aria-pressed="true"]{color:var(--amber);background:rgba(255,180,84,.1)}.mode-button[hidden]{display:none}
.studio-main{min-width:0;display:grid;grid-template-rows:74px 46px minmax(0,1fr) 34px}.studio-header{display:grid;grid-template-columns:minmax(240px,1fr) auto minmax(240px,1fr);align-items:center;padding:0 22px;border-bottom:1px solid var(--line);background:rgba(8,11,15,.84);backdrop-filter:blur(20px)}.eyebrow,.workspace-kicker,.panel-kicker{font-size:10px;letter-spacing:.17em;font-weight:850;color:#718095}.eyebrow span,.workspace-kicker{color:var(--cyan)}.project-row{display:flex;align-items:center;gap:12px;margin-top:5px}.project-name{border:0;background:none;padding:0;font-size:17px;font-weight:760;cursor:pointer}.project-name span{color:var(--muted)}.save-state{font-size:11px;color:var(--muted);display:flex;gap:6px;align-items:center}.save-state i,.status-dot{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 9px rgba(66,230,149,.7)}.transport-cluster{height:46px;border:1px solid var(--line);border-radius:12px;background:#090d12;display:flex;align-items:center;padding:4px;box-shadow:inset 0 1px 0 rgba(255,255,255,.025)}.transport-button{width:38px;height:36px;border:0;border-right:1px solid #171e27;background:transparent;color:#93a1b3;cursor:pointer}.transport-button:hover{color:white}.transport-button.play{color:#061014;background:var(--cyan);border-radius:8px;font-size:13px;box-shadow:0 0 20px rgba(0,240,255,.22)}.transport-readout{min-width:62px;height:36px;display:flex;flex-direction:column;align-items:center;justify-content:center;border-left:1px solid #171e27}.transport-readout span{font-size:13px;font-variant-numeric:tabular-nums}.transport-readout small{font-size:7px;letter-spacing:.12em;color:#627084}.transport-chip{height:27px;margin:0 6px;border:1px solid #253241;border-radius:7px;background:#10161e;color:#637287;font-size:9px;font-weight:800}.transport-chip.is-on{color:var(--cyan);border-color:rgba(0,240,255,.36);background:rgba(0,240,255,.08)}.header-actions{justify-self:end;display:flex;gap:8px}.icon-button,.export-button,.soft-button{height:34px;border:1px solid var(--line);border-radius:9px;background:#0e141c;color:#98a6b8;cursor:pointer}.icon-button{width:34px}.export-button{padding:0 17px;color:white;background:linear-gradient(135deg,rgba(0,240,255,.18),rgba(179,102,255,.2));border-color:rgba(0,240,255,.3);font-weight:760}.studio-tabs{display:flex;align-items:end;padding:0 22px;border-bottom:1px solid var(--line);background:#080b0f}.studio-tab{height:45px;padding:0 18px;border:0;border-bottom:2px solid transparent;background:transparent;color:#69788a;font-size:12px;font-weight:750;cursor:pointer}.studio-tab:hover{color:#c7d2df}.studio-tab.is-active{color:white;border-bottom-color:var(--cyan)}.view-status{margin-left:auto;height:45px;display:flex;align-items:center;gap:8px;font-size:10px;color:#667587}.workspace-row{min-height:0;display:grid;grid-template-columns:minmax(0,1fr) 0;gap:0;padding:16px 16px 12px;transition:grid-template-columns .35s ease}.studio-shell.lesson-open .workspace-row{grid-template-columns:minmax(0,1fr) 330px;gap:12px}.workspace-card,.context-panel{border:1px solid var(--line);border-radius:15px;background:rgba(10,14,19,.94);box-shadow:var(--shadow);min-width:0;overflow:hidden}.workspace-card{display:grid;grid-template-rows:66px minmax(0,1fr)}.workspace-toolbar{display:flex;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:1px solid var(--line);background:linear-gradient(180deg,#10161e,#0c1117)}.workspace-toolbar h1{font-size:17px;margin:4px 0 0;letter-spacing:-.02em}.toolbar-actions{display:flex;gap:7px}.soft-button{padding:0 12px;font-size:10px;font-weight:720}.soft-button.icon-only{width:34px;padding:0}.tool-frame-wrap{min-height:0;position:relative;background:#06090d;overflow:hidden}.tool-frame-wrap:before{content:"";position:absolute;inset:0;pointer-events:none;background:linear-gradient(90deg,rgba(255,255,255,.016) 1px,transparent 1px),linear-gradient(rgba(255,255,255,.012) 1px,transparent 1px);background-size:24px 24px;opacity:.45}#tool-frame{position:absolute;inset:0;width:100%;height:100%;border:0;background:transparent;opacity:0;transition:opacity .25s ease}#tool-frame.is-ready{opacity:1}.loading-state{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;gap:12px;color:#758397;font-size:12px;z-index:2}.loading-state span{width:18px;height:18px;border:2px solid #293442;border-top-color:var(--cyan);border-radius:50%;animation:spin .8s linear infinite}.loading-state.is-hidden{display:none}@keyframes spin{to{transform:rotate(360deg)}}.context-panel{opacity:0;transform:translateX(18px);pointer-events:none;padding:18px;overflow:auto;transition:.3s ease;background:linear-gradient(180deg,#10161e,#0b0f14)}.studio-shell.lesson-open .context-panel{opacity:1;transform:none;pointer-events:auto}.context-head{display:flex;justify-content:space-between;gap:12px}.context-head h2{font-size:18px;line-height:1.18;margin:6px 0 0}.panel-close{border:1px solid var(--line);width:30px;height:30px;border-radius:8px;background:#0b1017;color:#7f8da0;cursor:pointer}.lesson-progress{height:3px;background:#1c2530;margin:18px 0;border-radius:8px;overflow:hidden}.lesson-progress span{display:block;width:45%;height:100%;background:linear-gradient(90deg,var(--cyan),var(--violet));box-shadow:0 0 12px rgba(0,240,255,.35)}.context-panel>p{color:#8d9bad;font-size:12px;line-height:1.65}.task-list{display:grid;gap:8px;margin:18px 0}.task-item{width:100%;display:grid;grid-template-columns:30px 1fr 18px;align-items:center;text-align:left;gap:9px;padding:11px;border:1px solid var(--line);border-radius:11px;background:#0b1016;color:#8290a3}.task-item>span{display:grid;place-items:center;width:26px;height:26px;border-radius:8px;background:#151c25;font-size:11px;font-weight:800}.task-item strong{display:block;color:#b8c4d1;font-size:11px}.task-item small{font-size:9px;color:#5f6d7e}.task-item i{text-align:center;font-style:normal}.task-item.is-current{border-color:rgba(0,240,255,.35);background:rgba(0,240,255,.055)}.task-item.is-current>span{color:#041014;background:var(--cyan)}.task-item.is-current strong{color:white}.task-item.is-done i{color:var(--green)}.listen-card{display:flex;gap:11px;padding:13px;border:1px solid rgba(179,102,255,.26);border-radius:11px;background:rgba(179,102,255,.07)}.listen-icon{color:var(--violet)}.listen-card strong{font-size:10px;letter-spacing:.08em;text-transform:uppercase}.listen-card p{margin:4px 0 0;color:#8290a3;font-size:10px;line-height:1.5}.continue-button{width:100%;height:42px;margin-top:16px;border:0;border-radius:10px;background:linear-gradient(100deg,var(--cyan),#75d9ff 45%,var(--violet));color:#061014;font-size:11px;font-weight:850;cursor:pointer}.text-button{width:100%;border:0;background:none;color:#748397;margin-top:10px;font-size:10px;cursor:pointer}.studio-footer{display:flex;align-items:center;justify-content:space-between;padding:0 18px;border-top:1px solid var(--line);background:#070a0e;color:#68778a;font-size:9px}.footer-left,.footer-right{display:flex;align-items:center;gap:10px}.divider{width:1px;height:12px;background:var(--line)}.footer-right button{border:0;background:transparent;color:#68778a;font-size:9px}
@media(max-width:980px){.studio-shell{grid-template-columns:68px minmax(0,1fr)}.studio-header{grid-template-columns:1fr auto}.transport-cluster{display:none}.studio-shell.lesson-open .workspace-row{grid-template-columns:minmax(0,1fr) 290px}.mode-button,.rail-action{min-height:54px}.mode-button span:last-child,.rail-action span:last-child{display:none}}@media(max-width:720px){html,body{overflow:auto}.studio-shell{min-height:100vh;height:auto;grid-template-columns:1fr;padding-bottom:64px}.studio-rail{position:fixed;bottom:0;left:0;right:0;height:64px;z-index:10;flex-direction:row;border-right:0;border-top:1px solid var(--line);padding:5px 8px}.brand,.rail-spacer,#help-toggle{display:none}.mode-nav{display:flex;justify-content:space-around}.mode-button,.rail-action{min-height:52px;min-width:58px}.mode-icon{font-size:19px}.mode-button span:last-child,.rail-action span:last-child{display:block}.mode-button.is-active:before{left:50%;top:-5px;width:26px;height:3px;transform:translateX(-50%);border-radius:0 0 4px 4px}.studio-main{min-height:calc(100vh - 64px);grid-template-rows:64px 42px minmax(650px,1fr) 30px}.studio-header{padding:0 12px}.save-state,.header-actions .icon-button{display:none}.workspace-row,.studio-shell.lesson-open .workspace-row{grid-template-columns:1fr;padding:8px;gap:8px}.context-panel{display:none}.studio-shell.lesson-open .context-panel{display:block;position:fixed;inset:70px 10px 74px;z-index:9}.workspace-toolbar{padding:0 12px}.toolbar-actions .ab-button{display:none}.studio-tabs{padding:0 8px;overflow-x:auto}.studio-tab{padding:0 11px}.view-status{display:none}.studio-footer{padding:0 10px}.footer-right{display:none}}


/* Quality pass v2: viewport fitting, scroll containment and responsive density */
.studio-main,.workspace-row,.workspace-card,.tool-frame-wrap{min-height:0}
.workspace-row{overflow:hidden}
.workspace-card{height:100%;max-height:100%}
.tool-frame-wrap{isolation:isolate}
#tool-frame{display:block;overscroll-behavior:contain}
.context-panel{overscroll-behavior:contain;scrollbar-gutter:stable}
.mode-button:focus-visible,.rail-action:focus-visible,.studio-tab:focus-visible,.transport-button:focus-visible,.soft-button:focus-visible,.icon-button:focus-visible,.export-button:focus-visible,.panel-close:focus-visible,.continue-button:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}
@media (max-height:860px) and (min-width:721px){
  .studio-main{grid-template-rows:64px 40px minmax(0,1fr) 28px}
  .studio-header{padding-inline:18px}.studio-tabs{padding-inline:18px}.studio-tab,.view-status{height:39px}
  .workspace-row{padding:10px 12px 8px}.workspace-card{grid-template-rows:56px minmax(0,1fr)}
  .workspace-toolbar h1{font-size:15px}.workspace-kicker{font-size:9px}.mode-button,.rail-action{min-height:52px}.brand{margin-bottom:12px}
  .context-panel{padding:14px}.context-head h2{font-size:16px}.lesson-progress{margin:12px 0}.task-list{margin:12px 0}.task-item{padding:9px}
}
@media (max-height:720px) and (min-width:721px){
  .studio-main{grid-template-rows:58px 36px minmax(0,1fr) 0}
  .studio-footer{display:none}.studio-tab,.view-status{height:35px}.workspace-row{padding:8px}
  .workspace-card{grid-template-rows:50px minmax(0,1fr)}.workspace-toolbar{padding-inline:12px}.toolbar-actions{display:flex}
  .studio-rail{padding-top:8px}.brand-mark{width:36px;height:36px}.brand-word{display:none}.mode-nav{gap:4px}
}
@media (max-width:1180px) and (min-width:721px){
  .studio-header{grid-template-columns:minmax(190px,1fr) auto minmax(140px,1fr)}
  .studio-shell.lesson-open .workspace-row{grid-template-columns:minmax(0,1fr) minmax(280px,31vw)}
}
@media (max-width:720px){
  html,body{min-height:100%;overflow-x:hidden;overflow-y:auto}
  .studio-shell{width:100%;min-width:0}.studio-main{width:100%;min-width:0;grid-template-rows:60px 42px auto 30px}
  .studio-header{position:sticky;top:60px;z-index:7}.studio-tabs{position:sticky;top:120px;z-index:6;background:#080b0f}
  .workspace-row{overflow:visible;min-height:0}.workspace-card{height:auto;min-height:720px;grid-template-rows:58px minmax(640px,76vh)}
  .tool-frame-wrap{min-height:640px}.project-name{font-size:15px}.export-button{padding-inline:12px}
  .context-panel{overflow-y:auto;-webkit-overflow-scrolling:touch;max-height:calc(100dvh - 152px)}
  .studio-footer{position:relative}.studio-rail{padding-bottom:max(5px,env(safe-area-inset-bottom));height:calc(64px + env(safe-area-inset-bottom))}
}
@media (max-width:430px){
  .studio-tab{padding-inline:9px;font-size:11px}.workspace-row{padding:6px}.workspace-toolbar h1{font-size:14px}
  .soft-button{padding-inline:9px}.toolbar-actions .preset-button{max-width:118px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
}
@media (prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition-duration:.01ms!important}}

/* MPL design-system alignment pass v3 */
html,body{font-family:var(--font-body)}
.studio-shell{background:var(--gradient-hero),var(--bg-primary)}
.studio-rail,.studio-header,.studio-tabs,.studio-footer{background:color-mix(in srgb,var(--bg-primary) 94%,transparent)}
.brand-mark{border-radius:var(--radius-md);border-color:var(--border-glow);background:var(--gradient-glow);box-shadow:var(--shadow-sm)}
.mode-button,.rail-action,.icon-button,.export-button,.soft-button,.panel-close,.task-item{border-radius:var(--radius-md);transition:all var(--transition-fast)}
.mode-button:hover,.rail-action:hover,.soft-button:hover,.icon-button:hover,.panel-close:hover{background:var(--bg-elevated);color:var(--text-primary)}
.mode-button.is-active{background:var(--gradient-glow);box-shadow:inset 0 0 0 1px var(--border-glow)}
.workspace-card.card,.context-panel.card{padding:0;background:var(--bg-card);border-color:var(--border-subtle);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);transform:none}
.workspace-card.card:hover,.context-panel.card:hover{background:var(--bg-card);border-color:var(--border-subtle);transform:none;box-shadow:var(--shadow-lg)}
.workspace-toolbar{background:linear-gradient(180deg,var(--bg-tertiary),var(--bg-secondary))}
.soft-button,.icon-button,.panel-close{background:var(--bg-secondary);border-color:var(--border-light);color:var(--text-secondary)}
.export-button{background:var(--gradient-glow);border-color:var(--border-glow);color:var(--text-primary)}
.studio-tab{color:var(--text-muted);transition:color var(--transition-fast),border-color var(--transition-fast)}
.studio-tab:hover,.studio-tab.is-active{color:var(--text-primary)}
.context-panel{background:linear-gradient(180deg,var(--bg-tertiary),var(--bg-card))}
.task-item{background:var(--bg-secondary);border-color:var(--border-subtle);color:var(--text-muted)}
.listen-card{border-radius:var(--radius-md);background:rgba(179,102,255,.08)}
.continue-button.btn{width:100%;margin-top:var(--space-md);min-height:42px;height:auto}
.text-button.btn{width:100%;margin-top:var(--space-sm);min-height:36px}

/* MPL alignment pass v4: shared controls, badges and lesson primitives */
.save-state.badge{padding:var(--space-xs) var(--space-sm);border-radius:var(--radius-sm);text-transform:none;letter-spacing:0;font-size:.68rem;color:var(--text-secondary)}
.save-state.badge i{flex:0 0 auto}
.transport-readout small{color:var(--text-muted)}
.studio-footer,.studio-footer .footer-right button{color:var(--text-muted)}
.header-actions .btn,.toolbar-actions .btn{min-height:34px;height:34px}
.header-actions .btn-icon,.toolbar-actions .btn-icon{width:34px;padding:0}
.export-button.btn-primary{padding-inline:var(--space-lg);border-radius:var(--radius-full);font-size:.72rem}
.soft-button.btn-secondary{padding-inline:var(--space-md);border-radius:var(--radius-full);font-size:.68rem}
.panel-kicker.badge{width:max-content;padding:var(--space-xs) var(--space-sm);font-size:.62rem}
.listen-card.exercise-info{margin:0;padding:var(--space-md);background:var(--bg-tertiary);border-color:var(--border-subtle);border-radius:var(--radius-md)}
.context-panel.card{padding:var(--space-lg)}
.context-panel.card:hover,.workspace-card.card:hover{transform:none;background:var(--bg-card);border-color:var(--border-subtle);box-shadow:var(--shadow-lg)}

.layout-edit-button{position:fixed!important;top:132px;right:24px;z-index:1000;display:flex!important;align-items:center;justify-content:center;min-width:160px!important;min-height:50px!important;padding:0 24px!important;border:2px solid #ff7b85!important;border-radius:8px!important;background:#e00018!important;color:#fff!important;box-shadow:0 8px 30px rgba(224,0,24,.5)!important;font-size:14px!important;font-weight:900!important;letter-spacing:.06em;text-transform:uppercase;cursor:pointer}
.layout-edit-button:hover{background:#ff1630!important;transform:translateY(-1px)}
.layout-edit-button[aria-pressed="true"]{background:#b00014!important;border-color:#fff!important}
.layout-edit-button[hidden]{display:none!important}
@media(max-width:720px){.layout-edit-button{top:110px;right:12px;min-width:142px!important;min-height:46px!important;font-size:12px!important}}
.layout-export-button,.layout-grid-button,.layout-quantize-button,.layout-undo-quantize-button,.layout-reset-button{white-space:nowrap}
.layout-export-button[hidden],.layout-grid-button[hidden],.layout-quantize-button[hidden],.layout-undo-quantize-button[hidden],.layout-reset-button[hidden]{display:none!important}
.layout-snap-control{display:flex;align-items:center;gap:6px;height:34px;padding:0 8px;border:1px solid var(--border-default);border-radius:var(--radius-md);background:var(--bg-tertiary);color:var(--text-muted);font-size:9px;font-weight:750;white-space:nowrap}
.layout-snap-control[hidden]{display:none}.layout-snap-control select{height:24px;min-height:0;padding:0 22px 0 7px;border:1px solid var(--border-subtle);border-radius:4px;background:var(--bg-primary);color:var(--text-primary);font:700 9px/1 var(--font-mono)}
.layout-grid-button[aria-pressed="true"]{color:var(--cyan);border-color:rgba(0,240,255,.45);background:rgba(0,240,255,.08)}
.layout-reset-button{color:var(--text-muted)}
.synth-user-zoom{display:flex;align-items:center;height:34px;border:1px solid rgba(0,240,255,.38);border-radius:var(--radius-full);background:rgba(0,240,255,.055);overflow:hidden;box-shadow:inset 0 0 0 1px rgba(0,240,255,.03)}
.synth-user-zoom[hidden]{display:none!important}.synth-user-zoom-label{padding:0 7px 0 9px;color:var(--accent-cyan);font:800 8px/1 var(--font-mono);letter-spacing:.08em}.synth-user-zoom button{display:grid;place-items:center;width:30px;height:32px;min-height:0;padding:0;border:0;border-left:1px solid var(--border-subtle);background:transparent;color:var(--text-primary);font:800 15px/1 var(--font-mono);cursor:pointer}.synth-user-zoom button:hover:not(:disabled){color:var(--accent-cyan);background:var(--bg-elevated)}.synth-user-zoom button:focus-visible{outline:2px solid var(--accent-cyan);outline-offset:-3px}.synth-user-zoom button:disabled{opacity:.28;cursor:default}.synth-user-zoom output{display:grid;place-items:center;min-width:42px;height:22px;border-left:1px solid var(--border-subtle);color:var(--text-primary);font:750 9px/1 var(--font-mono);font-variant-numeric:tabular-nums}
@media(max-width:1100px){.layout-export-button,.layout-grid-button,.layout-quantize-button,.layout-undo-quantize-button,.layout-reset-button{font-size:0;width:34px;padding:0}.layout-export-button:after{content:"⇩";font-size:14px}.layout-grid-button:after{content:"#";font-size:13px}.layout-quantize-button:after{content:"⌗";font-size:14px}.layout-undo-quantize-button:after{content:"↶";font-size:14px}.layout-reset-button:after{content:"↺";font-size:14px}.layout-snap-control{padding-inline:6px}.layout-snap-control>span{display:none}}
@media(max-width:720px){.toolbar-actions .preset-button,.toolbar-actions .icon-only{display:none}.synth-user-zoom:not([hidden]){display:flex!important}.workspace-toolbar{width:100%;max-width:100%;min-width:0}.workspace-toolbar>div:first-child{min-width:0;overflow:hidden}.workspace-toolbar h1{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.toolbar-actions{flex:0 0 auto;min-width:0}}
.task-item{border-color:var(--border-subtle);border-radius:var(--radius-md);background:var(--bg-secondary);color:var(--text-muted);transition:background var(--transition-fast),border-color var(--transition-fast)}
.task-item:hover{background:var(--bg-tertiary);border-color:var(--border-light)}
.task-item strong{color:var(--text-secondary)}
.task-item small{color:var(--text-muted)}
.task-item.is-current{border-color:var(--border-glow);background:rgba(0,240,255,.06)}
.task-item.is-current>span{background:var(--accent-cyan)}
.continue-button.btn-primary,.text-button.btn-ghost{width:100%;min-height:40px}
.text-button.btn-ghost{margin-top:var(--space-sm)}

/* Iteration loop v4: task-state clarity and accessible progress */
.lesson-progress span{transition:width var(--transition-base)}
.task-item[aria-current="step"]{box-shadow:inset 3px 0 0 var(--accent-cyan)}
.task-item.is-done{border-color:rgba(0,255,157,.22);background:rgba(0,255,157,.05)}
.task-item.is-done>span{color:var(--accent-green);background:rgba(0,255,157,.12)}
.continue-button:disabled{opacity:.58;cursor:default;transform:none;box-shadow:none}
.text-button{text-decoration:none}

/* Song arrangement v1 */
#tool-frame[hidden]{display:none!important}
.arrangement-workspace{position:absolute;inset:0;display:grid;grid-template-rows:auto minmax(0,1fr) 28px;background:#070a0e;color:var(--text-primary);z-index:3;--track-head:154px;--bar-width:64px;--timeline-bars:32}
.arrangement-workspace[hidden]{display:none!important}
.arrangement-toolbar{display:flex;align-items:end;gap:8px;min-height:55px;padding:7px 10px;border-bottom:1px solid var(--border-subtle);background:var(--bg-secondary);overflow-x:auto;scrollbar-width:thin}
.arrangement-toolbar label,.arrangement-repeat-control>span{display:grid;gap:3px;color:var(--text-muted);font:750 8px/1 var(--font-mono);letter-spacing:.06em;text-transform:uppercase;white-space:nowrap}
.arrangement-toolbar select,.arrangement-toolbar input{height:28px;min-height:0;padding:0 26px 0 8px;border:1px solid var(--border-default);border-radius:4px;background:var(--bg-primary);color:var(--text-primary);font:650 10px/1 var(--font-mono)}
.arrangement-name-field{min-width:150px}.arrangement-name-field input{width:100%;padding-right:8px}.arrangement-divider{align-self:center;width:1px;height:28px;background:var(--border-subtle)}
.arrangement-tool-toggle{display:flex;gap:2px;align-self:center;padding:2px;border:1px solid var(--border-default);border-radius:6px;background:var(--bg-primary)}
.arrangement-tool-btn{height:26px;padding:0 12px;border:0;border-radius:4px;background:transparent;color:var(--text-muted);font:750 10px/1 var(--font-mono);letter-spacing:.04em;cursor:pointer}
.arrangement-tool-btn.is-active{background:var(--accent-cyan);color:#04141a}
.arrangement-track-rows.tool-pencil .arrangement-lane{cursor:crosshair}
.arrangement-track-rows.tool-pencil .arrangement-clip{cursor:not-allowed}
.arrangement-context-menu{position:fixed;z-index:2000;min-width:140px;padding:4px;border:1px solid var(--border-default);border-radius:8px;background:var(--bg-secondary);box-shadow:0 12px 32px rgba(0,0,0,.5)}
.arrangement-context-menu button{display:block;width:100%;padding:8px 10px;border:0;border-radius:5px;background:transparent;color:var(--text-primary);font:650 11px/1 var(--font-mono);text-align:left;cursor:pointer}
.arrangement-context-menu button:hover{background:var(--bg-tertiary)}
.arrangement-context-menu button[data-ctx-action="delete"]{color:#ff8791}
.arrangement-repeat-control{display:grid;grid-template-columns:28px 34px 28px;grid-template-rows:11px 28px;align-items:center}.arrangement-repeat-control>span{grid-column:1/-1}.arrangement-repeat-control button{height:28px;border:1px solid var(--border-default);background:var(--bg-primary);color:var(--text-primary);font:800 14px/1 var(--font-mono);cursor:pointer}.arrangement-repeat-control button:first-of-type{border-radius:4px 0 0 4px}.arrangement-repeat-control button:last-of-type{border-radius:0 4px 4px 0}.arrangement-repeat-control output{display:grid;place-items:center;height:28px;border-block:1px solid var(--border-default);background:var(--bg-tertiary);font:750 10px/1 var(--font-mono)}.arrangement-repeat-control button:disabled,.arrangement-toolbar :disabled{opacity:.38;cursor:default}.arrangement-delete{color:#ff8791!important}
.arrangement-scroll{min-height:0;overflow:auto;overscroll-behavior:contain;scrollbar-color:#334155 #0b0f14;scrollbar-width:thin;outline:none}.arrangement-scroll:focus-visible{box-shadow:inset 0 0 0 2px var(--accent-cyan)}
.arrangement-canvas{position:relative;width:calc(var(--track-head) + var(--timeline-bars) * var(--bar-width));min-width:100%;min-height:100%;background:#080c11}
.arrangement-section-row,.arrangement-ruler-row,.arrangement-track-row{display:grid;grid-template-columns:var(--track-head) calc(var(--timeline-bars) * var(--bar-width))}
.arrangement-section-row{position:sticky;top:0;z-index:8;height:26px;background:#0c1117;border-bottom:1px solid var(--border-subtle)}.arrangement-section-spacer,.arrangement-ruler-spacer{position:sticky;left:0;z-index:2;border-right:1px solid var(--border-default);background:#0c1117}
.arrangement-section-lane,.arrangement-ruler-lane,.arrangement-lane{position:relative;background-image:linear-gradient(to right,rgba(255,255,255,.055) 1px,transparent 1px),linear-gradient(to right,rgba(255,255,255,.018) 1px,transparent 1px);background-size:var(--bar-width) 100%,calc(var(--bar-width) / 4) 100%}
.arrangement-section{position:absolute;inset-block:3px;left:calc((var(--section-start) - 1) * var(--bar-width));width:calc(var(--section-length) * var(--bar-width));padding:3px 7px;border-left:2px solid var(--section-color);background:color-mix(in srgb,var(--section-color) 12%,transparent);color:var(--text-secondary);font:800 8px/1.5 var(--font-mono);letter-spacing:.08em;text-transform:uppercase}
.arrangement-ruler-row{position:sticky;top:26px;z-index:7;height:25px;border-bottom:1px solid var(--border-default);background:#0a0f15}.arrangement-ruler-lane{height:100%}.arrangement-bar-number{position:absolute;left:calc((var(--bar) - 1) * var(--bar-width) + 5px);top:7px;color:#667486;font:700 8px/1 var(--font-mono)}
.arrangement-track-row{height:76px;border-bottom:1px solid var(--border-subtle)}.arrangement-track-head{position:sticky;left:0;z-index:5;display:grid;grid-template-columns:5px 1fr auto;align-items:center;gap:8px;padding:8px 9px;background:#0d1218;border-right:1px solid var(--border-default)}.arrangement-track-head.is-selected{background:#121923}.arrangement-track-color{align-self:stretch;border-radius:2px;background:var(--track-color)}.arrangement-track-copy{min-width:0}.arrangement-track-copy strong{display:block;overflow:hidden;text-overflow:ellipsis;color:var(--text-primary);font-size:10px;white-space:nowrap}.arrangement-track-copy small{display:block;margin-top:4px;color:var(--text-muted);font:650 8px/1 var(--font-mono);text-transform:uppercase}.arrangement-track-actions{display:grid;grid-template-columns:24px 24px;gap:3px}.arrangement-track-actions button{width:24px;height:23px;border:1px solid var(--border-default);border-radius:3px;background:var(--bg-primary);color:var(--text-muted);font:750 8px/1 var(--font-mono);cursor:pointer}.arrangement-track-actions button.is-on{border-color:var(--track-color);color:var(--track-color);background:color-mix(in srgb,var(--track-color) 12%,transparent)}
.arrangement-lane{height:76px;position:relative}.arrangement-lane.is-selected{background-color:rgba(255,255,255,.018)}.arrangement-lane-add{position:absolute;inset:5px auto 5px 4px;width:26px;border:1px dashed transparent;background:transparent;color:transparent;cursor:pointer}.arrangement-lane:hover .arrangement-lane-add,.arrangement-lane-add:focus-visible{border-color:var(--border-light);color:var(--text-muted)}
.arrangement-track-row.is-drop-valid .arrangement-track-head,.arrangement-track-row.is-drop-valid .arrangement-lane{background-color:color-mix(in srgb,var(--track-color) 12%,#0b1016);box-shadow:inset 0 0 0 1px var(--track-color)}.arrangement-track-row.is-drop-invalid .arrangement-track-head,.arrangement-track-row.is-drop-invalid .arrangement-lane{background-color:rgba(255,79,91,.09);box-shadow:inset 0 0 0 1px #ff4f5b}
.arrangement-clip{position:absolute;top:8px;left:calc((var(--clip-start) - 1) * var(--bar-width) + 3px);width:calc(var(--clip-bars) * var(--bar-width) - 6px);height:58px;padding:7px 22px 6px 8px;border:1px solid color-mix(in srgb,var(--clip-color) 62%,#fff 6%);border-radius:4px;background-color:color-mix(in srgb,var(--clip-color) 22%,#0b1016);background-image:repeating-linear-gradient(to right,transparent 0,transparent calc(var(--clip-length) * var(--bar-width) - 1px),color-mix(in srgb,var(--clip-color) 48%,transparent) calc(var(--clip-length) * var(--bar-width) - 1px),color-mix(in srgb,var(--clip-color) 48%,transparent) calc(var(--clip-length) * var(--bar-width)));box-shadow:inset 3px 0 0 var(--clip-color);color:var(--text-primary);cursor:grab;touch-action:none;overflow:hidden}.arrangement-clip:active{cursor:grabbing}.arrangement-clip.is-selected{outline:2px solid var(--accent-cyan);outline-offset:1px;z-index:3}.arrangement-clip strong{display:block;overflow:hidden;text-overflow:ellipsis;font-size:10px;white-space:nowrap}.arrangement-clip small{display:block;margin-top:5px;color:var(--text-secondary);font:650 8px/1 var(--font-mono)}.arrangement-clip-repeat{position:absolute;right:7px;top:7px;color:var(--clip-color);font:800 8px/1 var(--font-mono)}.arrangement-clip-resize{position:absolute;right:0;top:0;width:9px;height:100%;border:0;border-left:1px solid color-mix(in srgb,var(--clip-color) 52%,transparent);background:transparent;cursor:ew-resize;touch-action:none}
.arrangement-clip strong,.arrangement-clip small,.arrangement-clip-repeat{position:relative;z-index:2}.arrangement-clip small{position:absolute;left:8px;bottom:4px;margin:0}.arrangement-clip-pattern{position:absolute;z-index:1;left:8px;right:10px;top:24px;bottom:14px;overflow:hidden;pointer-events:none;opacity:.78}.arrangement-clip-pattern.is-empty{border-top:1px dashed color-mix(in srgb,var(--clip-color) 34%,transparent);opacity:.35}.arrangement-clip-pattern i{position:absolute;display:block;background:var(--clip-color);box-shadow:0 0 4px color-mix(in srgb,var(--clip-color) 55%,transparent);opacity:var(--preview-strength)}.arrangement-clip-pattern.is-drums{--preview-row-height:25%;background-image:linear-gradient(to right,rgba(255,255,255,.08) 1px,transparent 1px),linear-gradient(to bottom,rgba(255,255,255,.06) 1px,transparent 1px);background-size:6.25% 100%,100% var(--preview-row-height)}.arrangement-clip-pattern.is-drums i{left:calc(var(--preview-step) * 6.25% + 1px);top:calc(var(--preview-row) * var(--preview-row-height) + 1px);width:max(2px,calc(6.25% - 2px));height:calc(var(--preview-row-height) - 2px);border-radius:1px}.arrangement-clip-pattern.is-midi{border-bottom:1px solid color-mix(in srgb,var(--clip-color) 25%,transparent)}.arrangement-clip-pattern.is-midi i{left:var(--preview-left);bottom:calc(var(--preview-pitch) * 70%);width:var(--preview-width);height:3px;border-radius:2px}
.arrangement-clip.is-drag-source{opacity:.24;filter:saturate(.45)}.arrangement-clip-ghost{z-index:7;pointer-events:none;opacity:.76;border-style:dashed;background-color:color-mix(in srgb,var(--clip-color) 30%,#0b1016);box-shadow:inset 3px 0 0 var(--clip-color),0 0 0 1px color-mix(in srgb,var(--clip-color) 45%,transparent),0 8px 18px rgba(0,0,0,.28);transform:translateY(-1px)}.arrangement-clip-ghost.is-invalid{--clip-color:#ff4f5b!important;background-color:rgba(255,79,91,.17);color:#ffd5d8}
.arrangement-playhead{position:absolute;z-index:9;top:26px;bottom:0;left:calc(var(--track-head) + (var(--playhead-bar) - 1) * var(--bar-width));width:1px;background:var(--accent-cyan);box-shadow:0 0 8px rgba(0,240,255,.55);pointer-events:none}.arrangement-playhead:before{content:"";position:absolute;top:0;left:-4px;border-left:4px solid transparent;border-right:4px solid transparent;border-top:6px solid var(--accent-cyan)}
.arrangement-status{display:flex;align-items:center;margin:0;padding:0 10px;border-top:1px solid var(--border-subtle);background:#080c11;color:var(--text-muted);font:650 8px/1 var(--font-mono)}
.arrangement-track-copy{min-width:0;padding:0;border:0;background:none;color:inherit;text-align:left;cursor:pointer}
.arrangement-track-actions button{min-height:0}
.arrangement-track-actions button[data-open-track-editor]{grid-column:1/-1;width:51px;color:var(--track-color);font-size:7px;letter-spacing:.04em}
.toolbar-actions>[hidden]{display:none!important}
.song-return-arrangement[hidden]{display:none!important}
@media(max-width:720px){.arrangement-workspace{--track-head:124px;--bar-width:56px}.arrangement-toolbar{min-height:52px;padding:6px}.arrangement-divider{display:none}.arrangement-name-field{min-width:130px}.arrangement-track-row{height:68px}.arrangement-lane{height:68px}.arrangement-clip{height:50px}.arrangement-track-head{padding:6px}.arrangement-track-actions{display:grid}.arrangement-track-actions button[data-track-action]{display:none}}

/* Unified Studio shell: sidebar navigation, one transport, dynamic mixer */
.studio-main{grid-template-rows:74px minmax(0,1fr) 34px}
.transport-tempo input{width:52px;min-height:0;padding:0;border:0;background:transparent;color:var(--text-primary);font:700 13px/1 var(--font-mono);text-align:center;-moz-appearance:textfield}
.transport-tempo input::-webkit-inner-spin-button,.transport-tempo input::-webkit-outer-spin-button{margin:0;opacity:.35}
.transport-chip[aria-pressed="false"]{color:var(--text-muted);border-color:var(--border-subtle);background:transparent}
.transport-button.is-playing{color:#061014;background:var(--cyan);box-shadow:0 0 20px rgba(0,240,255,.22)}
.song-mixer-workspace{position:absolute;inset:0;z-index:4;display:grid;grid-template-rows:58px minmax(0,1fr) 28px;background:#070a0e}
.song-mixer-workspace[hidden]{display:none!important}
.song-mixer-toolbar{display:flex;align-items:center;gap:10px;padding:8px 12px;border-bottom:1px solid var(--border-subtle);background:var(--bg-secondary)}
.song-mixer-toolbar>div{display:grid;margin-right:auto}
.song-mixer-toolbar strong{font-size:12px}
.song-mixer-toolbar span{margin-top:3px;color:var(--text-muted);font-size:9px}
.song-mixer-toolbar label{display:grid;gap:3px;color:var(--text-muted);font:700 8px/1 var(--font-mono);text-transform:uppercase}
.song-mixer-toolbar select{height:28px;min-height:0;padding:0 28px 0 8px;border:1px solid var(--border-default);border-radius:4px;background:var(--bg-primary);color:var(--text-primary);font-size:10px}
.song-mixer-scroll{min-width:0;min-height:0;overflow:auto;overscroll-behavior:contain}
.song-mixer-channels{align-items:stretch;min-width:max-content;height:100%;padding:12px}
.song-mixer-channel.dm-channel{flex:0 0 98px;min-width:98px;max-width:98px;border-radius:6px}
.song-mixer-child.dm-channel{flex-basis:82px;min-width:82px;max-width:82px;border-style:dashed;background:#080d13}
.song-mixer-child .dm-channel-name{font-size:8px}
.song-drum-group-toggle{min-height:28px;padding:4px;border:0;border-bottom:1px solid var(--border-subtle);background:color-mix(in srgb,var(--ch-color) 8%,transparent);color:var(--ch-color);font:700 7px/1.25 var(--font-mono);cursor:pointer}
.song-mixer-fader,.song-mixer-pan{display:grid;justify-items:center;gap:5px;padding:5px;color:var(--text-muted);font:700 7px/1 var(--font-mono)}
.song-mixer-fader input{width:16px;height:124px;min-height:0;padding:0;writing-mode:vertical-lr;direction:rtl;accent-color:var(--ch-color)}
.song-mixer-pan input{width:72px;height:16px;min-height:0;padding:0;accent-color:var(--ch-color)}
.song-mixer-fader output,.song-mixer-pan output{min-height:12px;color:var(--text-secondary);font-size:8px}
.song-mixer-strip-actions{display:grid;grid-template-columns:1fr 1fr;margin-top:8px;border-top:1px solid var(--border-subtle)}
.song-mixer-strip-actions button{min-height:27px;padding:0;border:0;border-right:1px solid var(--border-subtle);background:transparent;color:var(--text-muted);font:700 7px/1 var(--font-mono);cursor:pointer}
.song-mixer-strip-actions button:last-child{border-right:0}
.song-mixer-strip-actions button:hover{color:var(--text-primary);background:var(--bg-elevated)}
.song-mixer-strip-actions button:disabled{opacity:.3;cursor:default}
.song-mixer-channel .dm-meter{height:112px;width:18px}
.song-mixer-channel .dm-channel-controls{margin-top:0}
.song-mixer-child .song-mixer-fader input{height:92px}
@media(max-width:980px){.transport-cluster{display:flex}.studio-header{grid-template-columns:minmax(150px,1fr) auto}.header-actions{display:none}.transport-readout:nth-of-type(2){display:none}}
@media(max-width:720px){.studio-main{grid-template-rows:60px auto 30px}.transport-cluster{position:fixed;z-index:11;left:50%;bottom:calc(68px + env(safe-area-inset-bottom));transform:translateX(-50%);height:42px;background:rgba(7,10,14,.96);box-shadow:0 8px 28px rgba(0,0,0,.55)}.transport-button{height:32px;width:34px}.transport-readout{height:32px;min-width:54px}.transport-chip{margin-inline:3px}.mode-nav{gap:2px}.mode-button,.rail-action{min-width:48px}.song-mixer-toolbar{align-items:end;overflow-x:auto}.song-mixer-toolbar>div{min-width:180px}.song-mixer-channels{padding:8px}.song-mixer-channel.dm-channel{flex-basis:88px;min-width:88px;max-width:88px}.song-mixer-child.dm-channel{flex-basis:76px;min-width:76px;max-width:76px}}

/* Shared clip editor: one Piano Roll contract for every melodic track */
.clip-editor-workspace{position:absolute;inset:0;z-index:5;overflow:auto;background:#070a0e;padding:8px}
.clip-editor-workspace[hidden]{display:none!important}
/* Instrument/Piano Roll toggle in the track-editor toolbar — one editor per
   track, entered the same way from anywhere (double-click a clip, the EDIT
   button, or the Edit rail tab), always opening on the instrument first. */
.instrument-view-toggle{display:flex;gap:2px;padding:2px;border:1px solid var(--line);border-radius:8px;background:#0e141c}
.instrument-view-btn{height:30px;padding:0 14px;border:0;border-radius:6px;background:transparent;color:#8a97a8;font-size:11px;font-weight:750;cursor:pointer}
.instrument-view-btn.is-active{background:var(--cyan);color:#04141a}
.lesson-exercise-status{font-size:11px;font-weight:700;color:#8a97a8;max-width:280px}
.lesson-exercise-status.is-pass{color:#42e695}
.lesson-exercise-status.is-fail{color:#ff8791}
/* Learn tab — every tutorial/walkthrough video that used to live scattered
   across the marketing pages and inside each embedded tool, collected in
   one place so the production views (Song/Mixer/Edit) stay clean. */
.learn-workspace{position:absolute;inset:0;z-index:5;overflow:auto;background:#070a0e;padding:24px}
.learn-workspace[hidden]{display:none!important}
.learn-tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:16px}
.learn-tab{padding:7px 14px;border-radius:999px;border:1px solid var(--line);background:#0e141c;color:#8a97a8;font-size:11px;font-weight:700;cursor:pointer}
.learn-tab.is-active{border-color:var(--cyan);color:var(--cyan);background:rgba(0,240,255,.08)}
.learn-panel{display:none;max-width:760px}
.learn-panel.is-active{display:block}
.learn-panel-text{color:#a8b3c2;font-size:13px;line-height:1.6;margin:0 0 14px}
.learn-video-frame{border-radius:12px;overflow:hidden;border:1px solid var(--line);background:#000}
.learn-video-frame video{width:100%;display:block}
/* Drum Pads — MPC-style visualizer. Same color per instrument as the
   sequencer rows and the mixer channel strips (drumChannelTemplate is the
   single source of truth), so a player can follow one instrument by color
   across all three views. */
.drum-pads-workspace{position:absolute;inset:0;z-index:5;overflow:auto;background:#070a0e;padding:24px;display:flex;flex-direction:column;align-items:center;gap:20px}
.drum-pads-workspace[hidden]{display:none!important}
.drum-pads-body{display:flex;flex-direction:column;align-items:center;gap:16px}
/* Fixed 4x4 bank like a real MPC — pads stay square and tightly packed
   instead of reflowing with the panel width, so the layout is immediately
   recognizable rather than a generic responsive grid. Unused slots (we
   only have 7 instruments) render as dark, inert placeholders. */
.drum-pads-grid{display:grid;grid-template-columns:repeat(4,104px);grid-template-rows:repeat(4,104px);gap:10px;padding:16px;border-radius:16px;background:#0b0f14;border:1px solid var(--line);box-shadow:inset 0 2px 10px rgba(0,0,0,.5)}
.drum-pad{position:relative;border-radius:8px;border:2px solid var(--pad-color,var(--line));background:color-mix(in srgb,var(--pad-color,#333) 14%,#0b0f14);color:#fff;cursor:pointer;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;transition:transform .05s ease,background .08s ease;overflow:hidden}
.drum-pad:active{transform:scale(.96)}
.drum-pad-number{position:absolute;top:5px;left:7px;font-size:9px;font-weight:800;color:var(--pad-color,#888);opacity:.8}
.drum-pad-dot{width:14px;height:14px;border-radius:50%;background:var(--pad-color,#888);box-shadow:0 0 10px var(--pad-color,#888)}
.drum-pad-label{font-size:11px;font-weight:750;letter-spacing:.02em}
.drum-pad.is-hit{background:color-mix(in srgb,var(--pad-color,#333) 55%,#0b0f14);box-shadow:inset 0 0 0 2px var(--pad-color,#fff),0 0 22px var(--pad-color,#333)}
.drum-pad-empty{border-radius:8px;border:1px dashed rgba(255,255,255,.08);background:rgba(255,255,255,.02)}
/* Per-pad synth engine — clicking a pad opens this panel with that
   instrument's synthesis parameters (drum-playground.html's DRUM_PRESETS
   engine, exposed live instead of buried in a sequencer-row dropdown).
   Only one engine is shown at a time; --engine-color follows the same
   drumChannelTemplate palette as the pad/mixer/sequencer. */
.drum-pad-engine{width:100%;max-width:640px;flex-shrink:0;border-radius:14px;border:1px solid color-mix(in srgb,var(--engine-color,var(--cyan)) 40%,var(--line));background:linear-gradient(180deg,color-mix(in srgb,var(--engine-color,var(--cyan)) 10%,#0b0f14),#0b0f14);box-shadow:0 0 30px -10px color-mix(in srgb,var(--engine-color,var(--cyan)) 35%,transparent);overflow:hidden}
.drum-pads-body{flex-shrink:0}
.drum-pad-engine[hidden]{display:none!important}
.drum-pad-engine-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px 16px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.02)}
.drum-pad-engine-title{display:flex;align-items:center;gap:9px;font-size:13px}
.drum-pad-engine-title strong{font-weight:800}
.drum-pad-engine-title span{margin-left:4px;color:#6b7686;font:750 9px/1 var(--font-mono);letter-spacing:.08em}
.drum-pad-engine-dot{width:11px;height:11px;border-radius:50%;background:var(--engine-color,var(--cyan));box-shadow:0 0 10px var(--engine-color,var(--cyan))}
.drum-pad-engine-actions{display:flex;gap:6px}
.drum-pad-engine-presets{display:flex;gap:6px;flex-wrap:wrap;padding:12px 16px 0}
.drum-pad-engine-preset{padding:6px 12px;border-radius:999px;border:1px solid var(--line);background:#0e141c;color:#8a97a8;font-size:10px;font-weight:700;cursor:pointer}
.drum-pad-engine-preset.is-active{border-color:var(--engine-color,var(--cyan));color:var(--engine-color,var(--cyan));background:color-mix(in srgb,var(--engine-color,var(--cyan)) 10%,transparent)}
.drum-pad-engine-waveform{padding:0 16px;margin-top:10px}
.drum-pad-engine-waveform canvas{width:100%;height:110px;display:block;border-radius:8px;background:#05070a;border:1px solid var(--line)}
.drum-pad-engine-knobs{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:14px 20px;padding:16px}
.drum-pad-engine-knob{display:grid;gap:6px}
.drum-pad-engine-knob-head{display:flex;justify-content:space-between;font:700 9px/1 var(--font-mono);color:#8a97a8;text-transform:uppercase}
.drum-pad-engine-knob-head output{color:var(--engine-color,var(--cyan))}
.drum-pad-engine-knob input[type="range"]{width:100%;accent-color:var(--engine-color,var(--cyan))}
.drum-pad.is-engine-open{box-shadow:0 0 0 2px var(--pad-color,#fff)}
.clip-editor-panel{display:grid;grid-template-rows:auto minmax(0,1fr) 28px;width:100%;height:100%;min-width:min(640px,100%);min-height:420px;max-width:100%;max-height:100%;overflow:auto;resize:both;border:1px solid var(--border-default);border-radius:6px;background:var(--bg-primary)}
.clip-editor-toolbar{display:flex;align-items:end;gap:10px;min-height:58px;padding:8px 10px;border-bottom:1px solid var(--border-subtle);background:var(--bg-secondary);overflow-x:auto}
.clip-editor-heading{display:grid;min-width:170px;margin-right:auto}.clip-editor-heading strong{font-size:12px}.clip-editor-heading span{margin-top:4px;color:var(--text-muted);font:650 8px/1 var(--font-mono);text-transform:uppercase}
.clip-editor-toolbar label{display:grid;grid-template-columns:auto auto;align-items:center;gap:3px 7px;color:var(--text-muted);font:700 8px/1 var(--font-mono);text-transform:uppercase;white-space:nowrap}
.clip-editor-toolbar label>span,.clip-editor-toolbar label>select{grid-column:1/-1}.clip-editor-toolbar select{height:28px;min-height:0;min-width:120px;padding:0 24px 0 7px;border:1px solid var(--border-default);border-radius:4px;background:var(--bg-primary);color:var(--text-primary);font-size:9px}
.clip-editor-toolbar input[type="range"]{width:100px;min-height:18px;margin:0;padding:0;accent-color:var(--accent-cyan)}
.clip-editor-toolbar output{min-width:48px;color:var(--text-secondary);font:700 8px/1 var(--font-mono);text-align:right;text-transform:none}
.clip-editor-toolbar :disabled{opacity:.4;cursor:default}
.clip-piano-roll{min-width:0;min-height:0;overflow:hidden;padding:8px}
.clip-piano-roll .song-piano-controller{height:100%;min-height:0}
/* Note-duration span bar now lives in styles.css (`[data-pr-note-start]`), shared
   by every compact piano roll instance (Studio, Harmony Playground, Synth Playground). */
@media(max-width:720px){.clip-editor-workspace{padding:5px}.clip-editor-panel{min-width:100%;min-height:520px;resize:vertical}.clip-editor-toolbar{padding:6px;gap:7px}.clip-editor-heading{min-width:150px}.clip-editor-toolbar input[type="range"]{width:82px}.clip-piano-roll{padding:5px}}

/* Official MPL site shell: the shared navbar owns site navigation; this rail only switches Studio workspaces. */
body.studio-prototype-page{height:100%;padding-top:62px;overflow:hidden}
body.studio-prototype-page>.studio-shell{height:100%;min-height:0}
.studio-prototype-page .navbar{z-index:1200}
.studio-header{position:relative;z-index:40}
.project-block{position:relative}
.project-name span:last-child{color:var(--text-muted)}
.project-menu{position:absolute;z-index:30;top:calc(100% + 10px);left:0;width:248px;padding:5px;border:1px solid var(--border-default);border-radius:6px;background:var(--bg-elevated);box-shadow:var(--shadow-lg)}
.project-menu[hidden]{display:none}
.project-menu button{display:grid;width:100%;gap:3px;padding:10px;border:0;border-radius:4px;background:transparent;color:var(--text-primary);text-align:left;cursor:pointer}
.project-menu button:hover,.project-menu button:focus-visible{background:var(--bg-tertiary)}
.project-menu strong{font-size:11px}
.project-menu small{color:var(--text-muted);font:650 8px/1.3 var(--font-mono)}
.studio-rail{padding-top:10px}
.studio-rail-label{display:grid;place-items:center;width:100%;min-height:30px;margin:0 0 10px;border-bottom:1px solid var(--border-subtle);color:var(--text-muted);font:800 8px/1 var(--font-mono);letter-spacing:.16em;text-transform:uppercase}
@media(max-width:720px){body.studio-prototype-page{padding-top:62px}.studio-header{top:auto;backdrop-filter:none;-webkit-backdrop-filter:none}.studio-rail-label{display:none}.studio-shell{min-height:0}.studio-main{min-height:100%}}

/* Keep exercise actions reachable when the Lesson panel narrows the workspace. */
.workspace-toolbar>div:first-child{min-width:0;flex:1 1 auto}
.workspace-toolbar>div:first-child h1{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.toolbar-actions{flex:0 0 auto;min-width:0}
#lesson-check-exercise{flex:0 0 auto}
.lesson-exercise-status{max-width:180px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

/* Exercise validation must remain reachable even on short laptop viewports. */
.studio-shell.lesson-exercise-open .toolbar-actions{display:flex}
@media(max-width:720px){
  .workspace-toolbar .toolbar-actions{flex:0 0 68%;width:68%;max-width:68%;overflow-x:auto;overscroll-behavior-x:contain;scrollbar-width:none}
  .workspace-toolbar .toolbar-actions::-webkit-scrollbar{display:none}
  .workspace-toolbar .toolbar-actions>*{flex-shrink:0}
  body.studio-prototype-page #mpl-mobile-notice{bottom:calc(118px + env(safe-area-inset-bottom))!important}
}