Coral observatory spotlight stage
Complete the spotlight stage in a coral observatory scene: includes real content, interactive controls, clear status feedback, and responsive layouts across sizes.
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<header class="mast"><div><span class="eyebrow">paper / Spotlight Stage / INTERMEDIATE</span><h1>Coral observatory spotlight stage</h1><p class="intro">Complete the spotlight stage in a coral observatory scene: includes real content, interactive controls, clear status feedback, and responsive layouts across sizes.</p></div><span class="scenario">Coral Observatory</span></header>
<div class="composition-split"><aside class="split-note"><b>CASE 02</b><span>Master the semantic structure, responsive arrangement, keyboard interaction, and state synchronization of the spotlight stage.</span></aside><section class="demo" aria-label="Coral Observatory Spotlight Stage Interaction Area"><div id="workflowSpatial" class="workflow-spatial" style="--spatial-width:64%;--spatial-zoom:1"><header><div><span class="eyebrow">Coral Observatory SPATIAL CANVAS</span><h2>Coral Observation Station Control Panel</h2></div><label>Visual intensity share<input id="workflowSpatialWidth" type="range" min="38" max="82" value="64"><output id="workflowSpatialWidthValue">64%</output></label><label>Content Scaling<input id="workflowSpatialZoom" type="range" min="80" max="120" value="100"><output id="workflowSpatialZoomValue">100%</output></label></header><div class="spatial-grid"><section id="workflowCore" class="workflow-core spatial-core"><!-- 11DZ_CORE_START:creative-effects-spotlight-stage --><div class="spotlight-lab"><section id="spotlightStage" class="spotlight-stage" tabindex="0" aria-label="Coral Observatory spotlight stage; move the pointer or use the arrow keys to control the light source" aria-describedby="spotlightHelp"><div class="spotlight-copy"><span>Coral Observatory / LIVE</span><h2>Move attention to the place that truly matters</h2><p id="spotlightHelp">Move the pointer, touch the stage, or use the arrow keys to control the spotlight.</p></div><div class="spotlight-cards" aria-hidden="true"><i></i><i></i><i></i></div></section><aside class="spotlight-controls panel"><span class="eyebrow">SPOTLIGHT STAGE</span><h2>Spotlight Stage</h2><label>Aperture size <input id="spotlightSize" type="range" min="90" max="320" value="190" data-core-bridge="creative-effects-spotlight-stage"><output id="spotlightSizeValue">190px</output></label><label>Ambient brightness <input id="spotlightAmbient" type="range" min="4" max="34" value="12"><output id="spotlightAmbientValue">12%</output></label><button id="spotlightCenter" class="action" type="button">Back to center</button></aside></div><!-- 11DZ_CORE_END --></section><input id="workflowSpatialHandle" class="spatial-handle" type="button" value="↔" aria-label="Drag to adjust the main case preview width"><aside><strong>Coral Observatory Base Layer</strong><p>The Coral Observatory dynamic tier and the Coral Observatory display tier will reflow as the canvas size changes.</p><output id="workflowSpatialStatus">Width 64%, zoom 100%</output><input id="workflowSpatialApply" class="action primary" type="button" value="Application Effect"></aside></div></div><p id="status" class="status" role="status" aria-live="polite"></p></section></div>
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<script>
'use strict';
const statusOutput = document.querySelector('#status');
const announce = message => { statusOutput.textContent = message; };
/* 11DZ_CORE_SCRIPT_START:creative-effects-spotlight-stage */
const spotlightStage=document.querySelector('#spotlightStage');const spotlightSize=document.querySelector('#spotlightSize');const spotlightAmbient=document.querySelector('#spotlightAmbient');let spotlightPoint={x:50,y:50};function setSpotlight(x,y){spotlightPoint.x=Math.max(0,Math.min(100,x));spotlightPoint.y=Math.max(0,Math.min(100,y));spotlightStage.style.setProperty('--spot-x',spotlightPoint.x+'%');spotlightStage.style.setProperty('--spot-y',spotlightPoint.y+'%');}function pointerSpotlight(event){const rect=spotlightStage.getBoundingClientRect();setSpotlight((event.clientX-rect.left)/rect.width*100,(event.clientY-rect.top)/rect.height*100);}spotlightStage.addEventListener('pointermove',pointerSpotlight);spotlightStage.addEventListener('pointerdown',pointerSpotlight);spotlightStage.addEventListener('keydown',event=>{if(!['ArrowLeft','ArrowRight','ArrowUp','ArrowDown'].includes(event.key))return;event.preventDefault();setSpotlight(spotlightPoint.x+(event.key==='ArrowRight'?4:event.key==='ArrowLeft'?-4:0),spotlightPoint.y+(event.key==='ArrowDown'?4:event.key==='ArrowUp'?-4:0));announce('Spotlight position '+Math.round(spotlightPoint.x)+'%，'+Math.round(spotlightPoint.y)+'%');});spotlightSize.addEventListener('input',()=>{spotlightStage.style.setProperty('--spot-size',spotlightSize.value+'px');document.querySelector('#spotlightSizeValue').textContent=spotlightSize.value+'px';announce('Aperture size '+spotlightSize.value+' pixels');});spotlightAmbient.addEventListener('input',()=>{spotlightStage.style.setProperty('--ambient',Number(spotlightAmbient.value)/100);document.querySelector('#spotlightAmbientValue').textContent=spotlightAmbient.value+'%';announce('Ambient brightness '+spotlightAmbient.value+'%');});document.querySelector('#spotlightCenter').addEventListener('click',()=>{setSpotlight(50,50);spotlightStage.focus();announce('The spotlight has returned to center stage');});
/* 11DZ_CORE_SCRIPT_END */
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workflowBridgeReset();
</script>
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