/* LUMA case-study demo. Tour proportions and controls follow the supplied 04 DEMO reference. */
html[data-case=luma] body{overflow-x:clip}
#motion-demo{scroll-margin-top:78px}
#motion-demo .sec-title{max-width:950px}
.lm-tour{display:grid;grid-template-columns:minmax(250px,340px) minmax(0,1fr);gap:clamp(24px,4vw,56px);margin-top:clamp(24px,3vw,40px);align-items:start}
.lm-steps{display:grid;align-content:start}
.lm-step{display:grid;grid-template-columns:48px 1fr;gap:14px;padding:18px 0 16px;border:0;border-top:1px solid var(--line);background:none;text-align:left;color:var(--muted);cursor:pointer;position:relative;transition:color .3s var(--ease);width:100%;font-family:var(--sans)}
.lm-step:last-child{border-bottom:1px solid var(--line)}
.lm-number{font-family:var(--serif);font-style:italic;font-size:clamp(22px,2.4vw,30px);line-height:1;color:var(--line);transition:color .3s}
.lm-step b{display:block;font-family:var(--serif);font-weight:400;font-size:clamp(17px,1.8vw,21px);line-height:1.3}
.lm-step small{display:block;font-size:12.5px;margin-top:7px;color:var(--muted);line-height:1.6}
.lm-step .lm-apparatus{font-size:10px;letter-spacing:.12em;margin:0 0 5px;text-transform:uppercase}
.lm-step:hover,.lm-step[aria-current=step],.lm-step[aria-current=step] .lm-number{color:var(--ink)}
.lm-progress{position:absolute;left:0;bottom:-1px;height:1px;width:100%;pointer-events:none}
.lm-progress i{display:block;height:100%;width:0;background:var(--ink);transition:width .2s linear}
.lm-stage{position:sticky;top:80px;display:grid;gap:16px;min-width:0}
.lm-screen{scroll-margin-top:80px;border:1px solid var(--line);border-radius:14px;background:var(--paper-2);overflow:hidden;box-shadow:0 8px 24px #00000008}
.lm-titlebar{padding:14px 18px;display:flex;justify-content:space-between;gap:12px;border-bottom:1px solid var(--line);align-items:center;min-height:52px}
.lm-titlebar b{font-size:12px;font-weight:500;line-height:1.5}.lm-titlebar>span{font-size:10px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);text-align:right}
.lm-frame-slot{height:clamp(340px,36vw,440px);position:relative;background:var(--paper-2)}
.lm-frame-slot iframe{display:block;width:100%;height:100%;border:0}
.lm-loading{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;text-align:center;padding:24px;font-size:13px;color:var(--muted);z-index:1;pointer-events:none;background:var(--paper-2)}
.lm-loading[hidden]{display:none}
.lm-controls{display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap}
.lm-controls button{border:1px solid var(--line);background:transparent;border-radius:999px;min-width:38px;height:38px;font:15px var(--sans);color:var(--ink);cursor:pointer;transition:border-color .25s,color .25s,opacity .25s}
.lm-controls button.wide{padding:0 16px;font-size:11px;letter-spacing:.1em;text-transform:uppercase}
.lm-controls button:hover{border-color:var(--ink)}.lm-controls button:disabled{opacity:.35;cursor:default}
.lm-controls output{font:10.5px ui-monospace,monospace;letter-spacing:.16em;color:var(--muted);min-width:70px;text-align:center}
.lm-hint{text-align:center;font-size:11.5px;color:var(--muted);line-height:1.6;min-height:19px}
.lm-explain{border-top:1px solid var(--line);padding-top:18px;display:grid;gap:10px}
.lm-explain h3{font-family:var(--serif);font-weight:400;font-size:clamp(18px,2vw,22px);line-height:1.3}
.lm-explain p{font-size:13px;line-height:1.7;color:var(--muted)}
.lm-explain a{justify-self:start;font-size:12px;border-bottom:1px solid var(--line);padding-bottom:3px}
.lm-explain .lm-note{font-size:11px;line-height:1.65}
#motion-demo :is(button,a):focus-visible{outline:2px solid var(--ink);outline-offset:4px}
@media(max-width:860px){.lm-tour{grid-template-columns:1fr}.lm-stage{position:static;order:-1}.lm-frame-slot{height:440px}.lm-step{grid-template-columns:38px 1fr}.lm-controls{gap:8px}.lm-controls button{min-height:44px;min-width:44px}.lm-controls output{min-width:56px}.lm-stage{gap:14px}}
@media(max-width:400px){.lm-frame-slot{height:400px}.lm-titlebar{padding:11px 12px}.lm-controls{gap:6px}.lm-controls button.wide{padding:0 12px}.lm-controls output{min-width:48px}}
@media(prefers-reduced-motion:reduce){#motion-demo *{transition:none!important;scroll-behavior:auto}}