/* A027 Cut & Grain Knives - phone build. The same pinned scene, model, HDRI and camera path as desktop, on native scroll; captions sit in the thumb zone. */
body{background:var(--c1)}
.intro{min-height:78svh;padding-top:calc(env(safe-area-inset-top) + 90px)}
.title{font-size:clamp(3.6rem,19vw,5.4rem)}
.chaps{left:var(--gutter);right:var(--gutter);bottom:calc(var(--s6) + env(safe-area-inset-bottom));height:11rem}
.chap{max-width:none}
.chap-h{font-size:2.2rem}
.prog{left:var(--gutter);right:var(--gutter);bottom:calc(var(--s4) + env(safe-area-inset-bottom))}

.intro{min-height:88svh;display:grid;align-items:end;padding-bottom:var(--s7)}
.intro-in{display:grid;gap:var(--s4)}
.title{font:800 clamp(4.4rem,1.6rem + 8vw,11rem)/.82 var(--f-display);letter-spacing:var(--track-display);color:var(--ink)}
.title .amp{font-weight:400;font-style:italic;color:var(--c3)}
.scroll-cue{display:flex;align-items:center;gap:8px;color:var(--ink-3)}.scroll-cue .icon{width:16px;height:16px}
.edge{position:relative;height:440svh;background:var(--c2)}
.pin{position:sticky;top:0;height:100svh;overflow:hidden}
.pin .hero-stage{position:absolute;inset:0}
.chaps{position:absolute;z-index:2;pointer-events:none}
.chap{position:absolute;left:0;bottom:0;display:grid;gap:8px;max-width:30rem;color:var(--c1);opacity:0;transform:translateY(16px);transition:opacity var(--dur) var(--ease-out),transform var(--dur) var(--ease-out)}
.chap.is-on{opacity:1;transform:none}
.chap .mono{color:var(--c3)}
.chap-h{font:700 clamp(2rem,1rem + 2.4vw,3.4rem)/1 var(--f-display);letter-spacing:var(--track-h);color:var(--c1)}
.chap .body{color:var(--on-dark-2)}
.chap span[id]{color:var(--c1);font-weight:600}
.prog{position:absolute;z-index:2;height:2px;background:var(--line-dark)}
.prog span{display:block;height:100%;width:100%;background:var(--c3);transform-origin:left;transform:scaleX(0)}
.st-list{margin:0;display:grid}
.st-list div{padding:var(--s4) 0;border-top:1px solid var(--line-strong);display:grid;gap:8px}
.st-list dt{color:var(--c3)}.st-list dd{margin:0}

.st-in{display:grid;gap:var(--s4)}.st-head{display:grid;gap:var(--s3)}