/* H06: approved ladder reference, adapted to the audio workspace. */
:root{--paper:#fff8ed;--ink:#232326;--red:#a62435;--ochre:#ffe66c;--sage:#75d9cf;--line:#bfb7aa;--muted:#605d58;--coral:#ff9197;--lilac:#bcabef}
body{background:var(--paper)}
.studio-shell{max-width:1540px;padding-inline:28px}
button,.file-button{border:2px solid var(--ink);border-radius:8px;box-shadow:3px 3px 0 var(--ink);font-weight:600;transition:transform .14s,box-shadow .14s,background-color .14s}
button:not(:disabled):hover,.file-button:not(:has(input:disabled)):hover{background:#fff2bd;transform:translate(-1px,-1px);box-shadow:4px 4px 0 var(--ink)}
button:not(:disabled):active,.file-button:active{transform:translate(3px,3px);box-shadow:0 0 0 var(--ink)}
button:disabled,.file-button:has(input:disabled){opacity:1;background:#ede8df;color:#807b72;border-color:#b3ada2;box-shadow:2px 2px 0 #b3ada2}
button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible,.wave-area:focus-visible,.file-button:focus-within{outline:3px solid #a62435;outline-offset:5px}
.sitebar{border-bottom-color:var(--line);letter-spacing:.02em}.view-actions{display:flex;gap:12px}.sitebar button{font-size:14px}.view-actions #motion{background:var(--ochre)}
.intro{padding-block:26px 24px}.eyebrow b{border:2px solid var(--ink);border-radius:4px;box-shadow:2px 2px 0 var(--ink)}h1{line-height:1.3;letter-spacing:-.045em}h1 span{display:inline-block;background:var(--ochre);color:var(--ink);padding:0 10px;border:2px solid var(--ink);box-shadow:4px 4px 0 var(--ink);transform:rotate(-2deg);margin-left:6px}
.intro-note{background:#fffefa;border:2px solid var(--ink);border-radius:10px;box-shadow:4px 4px 0 var(--ink);padding:14px 20px;color:var(--ink);font-weight:600;transform:rotate(3deg);margin-right:8px}
.steps{gap:12px;border:0;margin-bottom:22px}.steps li{border:2px solid var(--ink);border-radius:10px;background:#fffefa;box-shadow:3px 3px 0 var(--ink);padding:11px 14px;position:relative;transition:background-color .18s}
.steps li:last-child{border-right:2px solid var(--ink)}.steps li>b{display:grid;place-items:center;border:2px solid var(--ink);border-radius:50%;width:36px;height:36px;flex-shrink:0;color:var(--ink);font-size:17px;font-weight:700;background:var(--coral)}.steps li:nth-child(2)>b{background:var(--sage)}.steps li:nth-child(3)>b{background:var(--lilac)}.steps li:nth-child(4)>b{background:#ffc285}.steps [aria-current]{background:var(--ochre);box-shadow:3px 3px 0 var(--ink)}.steps [aria-current]:after{content:'';position:absolute;bottom:5px;right:10px;width:20px;height:3px;background:var(--ink)}.steps .done>b{color:var(--ink)}
#studio{border:2px solid var(--ink);border-radius:14px;background:#fffefa;box-shadow:7px 7px 0 var(--ink);overflow:hidden}
.sourcebar{margin:0;background:var(--ochre);padding:14px 20px;border-bottom:2px solid var(--ink)}.sourcebar span{color:#514a35}.source-actions #demo{background:#fffefa}.file-button{background:var(--sage)}
.workbench{border:0;border-radius:0;background:#20282d;padding:15px 22px 12px;border-bottom:2px solid var(--ink)}.wave-header>span{color:var(--sage)}.wave-header .play-status{display:flex;align-items:center;gap:8px;margin-left:auto;color:#e8e8dd;font-size:12px;letter-spacing:0}.play-bars{height:18px;display:flex;align-items:center;gap:3px}.play-bars i{width:3px;height:4px;background:var(--sage);transform-origin:center}.wave-header #clock{min-width:172px;text-align:right}.wave-area{height:clamp(160px,20vh,250px);background:#151e23}.region{background:#ffe66c38;border-color:var(--ochre)}.region-start,.region-end{background:var(--ochre);border:2px solid var(--ink);width:13px;height:13px}.wave-help{color:#d1d9dc}
.editor-controls{padding:16px 20px;gap:15px}.primary{background:var(--sage);color:var(--ink);min-width:130px}.primary:hover{color:var(--ink)}.cut-button{background:var(--coral);color:var(--ink);border-color:var(--ink)}#undo{background:var(--lilac)}#undo:disabled{background:#ede8df}.compare{gap:8px}.compare button{border-radius:7px}.compare button+button{border-left:2px solid var(--ink)}.compare [aria-pressed=true]{background:var(--ink);color:#fffefa}.compare [aria-pressed=true]:hover{background:#3d3d43;color:#fffefa}
.precision-row{margin:0;padding:0 20px 16px;border:0;gap:22px}.selection-fields legend{font-weight:600}.selection-fields legend span{color:var(--muted)}input[type=number]{border:2px solid var(--ink);border-radius:6px;background:#fffefa}.volume{border-left:2px solid #d0c9bc;padding-left:20px}.volume output{background:var(--ochre);border:1px solid var(--ink);border-radius:4px;padding:0 5px}.volume input{accent-color:var(--ink)}
.feedback{margin-top:20px;background:#e5f4ec;border:2px solid var(--ink);border-radius:8px;box-shadow:3px 3px 0 var(--ink);padding:12px 16px;min-height:50px}.feedback[data-error=true]{border-color:var(--ink);background:#ffe0dc}.delivery{padding:22px 0}.delivery h2{font-weight:600}.export-button{background:var(--ochre);color:var(--ink);border:2px solid var(--ink)}.export-button:hover{color:var(--ink)}summary{font-weight:600}details{border-bottom-color:var(--line)}.rating-buttons [aria-pressed=true]:hover{background:var(--ink);color:#fff}
html[data-playing=true] .play-bars i{height:14px}html[data-motion=on][data-playing=true] .play-bars i{animation:playing-bars .65s ease-in-out infinite alternate}html[data-playing=true] .play-bars i:nth-child(2){height:9px;animation-delay:-.3s}html[data-playing=true] .play-bars i:nth-child(3){height:17px;animation-delay:-.5s}
@keyframes playing-bars{from{transform:scaleY(.35)}to{transform:scaleY(1)}}
html[data-motion=off] *,html[data-motion=off] *:before,html[data-motion=off] *:after{animation:none!important;transition:none!important}
@media(max-width:1150px){.studio-shell{padding-inline:22px}.sitebar{flex-wrap:wrap;gap:12px}.sitebar>span{order:3;flex-basis:100%}.steps{gap:10px}.steps li{padding:10px}.steps li>span{font-size:18px}.editor-controls{gap:16px}.compare{margin-left:0}}
@media(max-width:760px){.studio-shell{padding-inline:16px}.sitebar{gap:12px}.view-actions{gap:9px}.sitebar button{font-size:12px;padding:8px;min-height:44px}.brand{font-size:24px}.brand span{display:none}.intro{padding-block:24px}.intro h1{font-size:clamp(28px,6.4vw,39px)}h1 span{padding-inline:6px;margin-left:2px}.steps li:nth-child(2){border-right:2px solid var(--ink)}.steps li:nth-child(-n+2){border-bottom:2px solid var(--ink)}.steps li{gap:9px}.steps li>b{width:31px;height:31px;font-size:15px}.steps small{font-size:11px}.steps li>span{font-size:16px}.sourcebar{padding:14px}.workbench{padding-inline:14px}.wave-header{flex-wrap:wrap;gap:10px}.wave-header .play-status{margin-left:0}.wave-header #clock{min-width:0;margin-left:auto}.wave-header>span:first-child{flex-basis:100%}.editor-controls{padding:16px 14px}.precision-row{padding:0 14px 16px}.volume{padding:12px 0 0;border-left:0;border-top:1px solid var(--line);max-width:none}.selection-fields legend span{display:block;margin:3px 0 0}.selection-fields button{font-size:13px;padding-inline:9px}.selection-fields{gap:8px}input[type=number]{width:100px}.feedback{font-size:15px}.delivery{padding-block:20px}.export-button{max-width:100%;font-size:16px}}
@media(min-width:1100px) and (max-height:850px){.intro{padding-block:18px 16px}.intro h1{font-size:42px}.steps{margin-bottom:18px}.steps li{padding-block:8px}.sourcebar{padding-block:10px}.workbench{padding-block:10px}.wave-area{height:140px}.editor-controls{padding-block:12px}.precision-row{padding-bottom:12px}.feedback{margin-top:16px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important}}