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span:not(:last-child):after{color:var(--letters-red);content:"◆";vertical-align:.15em;margin-left:1.4rem;font-size:.42rem}.letters-hero__artifact{align-self:center;margin:0;transform:rotate(1.7deg)}.letters-hero__artifact>div{background:#c8bca9;padding:clamp(.7rem,1.3vw,1.2rem);box-shadow:0 2.2rem 5rem #3020132e}.letters-hero__artifact img{filter:sepia(.12)contrast(.97);width:100%;display:block}.letters-hero__artifact figcaption{color:var(--letters-muted);letter-spacing:.06em;text-transform:uppercase;margin-top:.8rem;font-size:.6rem;line-height:1.6}.letters-hero__pullquote{color:var(--letters-muted);grid-column:2;max-width:32ch;margin:-2rem 0 0 auto;font-family:Georgia,Songti SC,Noto Serif CJK SC,serif;font-size:clamp(1rem,1.4vw,1.35rem);font-style:italic;line-height:1.45}.letters-publication-note{border-block:1px solid var(--letters-rule);letter-spacing:.025em;grid-template-columns:1fr 1fr;gap:1.5rem 4rem;max-width:91rem;margin:5rem auto 0;padding:1.5rem 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h1{border-top:1px solid var(--letters-ink);letter-spacing:-.045em;margin:7rem 0 2rem;padding-top:1.4rem;font-family:Georgia,Songti SC,Noto Serif CJK SC,serif;font-size:clamp(2.15rem,4.7vw,4.2rem);font-weight:400;line-height:1.02}.letters-paper>:first-child{margin-top:0}.letters-paper h2{color:var(--letters-red);font-family:var(--font-mono,ui-monospace, monospace);letter-spacing:.06em;text-transform:uppercase;margin:4.5rem 0 1.2rem;font-size:.79rem;font-weight:600;line-height:1.45}.letters-paper h3{margin:3rem 0 .8rem;font-size:1.18rem}.letters-paper p{margin:1.15rem 0}.letters-paper a{text-decoration-color:var(--letters-red);text-underline-offset:.18em}.letters-paper ol,.letters-paper ul{margin:1.5rem 0;padding-left:1.35rem}.letters-paper li{margin:.8rem 0;padding-left:.35rem}.letters-paper blockquote{border-left:0;border-block:1px solid var(--letters-rule);margin:3rem 0;padding:1.4rem 0;font-size:1rem;font-style:normal}.letters-paper figure{margin:3.5rem 0}.letters-paper figure img{background:#d1c5b3;width:100%;margin:0 auto;padding:.6rem;display:block}.letters-paper .archive-letter--portrait img{-o-object-fit:contain;object-fit:contain;max-height:50rem}.letters-paper figcaption{color:var(--letters-muted);font-family:var(--font-mono,monospace);margin-top:.75rem;font-size:.62rem;line-height:1.55}.letters-paper .system-diagram{margin-inline:clamp(-4rem,-8vw,-8rem)}.letters-paper .system-diagram img{background:#eee7da}.letters-paper hr{border:0;border-top:1px solid var(--letters-rule);margin:4rem 0}.letters-paper [role=doc-endnotes]{border-top:1px solid var(--letters-rule);margin-top:4rem;padding-top:2rem;font-size:.82rem}.heart-prototype{border-top:1px solid var(--letters-ink);max-width:91rem;margin:clamp(7rem,14vw,15rem) auto 0;padding-top:1.25rem}.heart-prototype__intro{grid-template-columns:1fr minmax(18rem,30rem);gap:3rem;display:grid}.heart-prototype__intro p{color:var(--letters-muted);margin:0;line-height:1.55}.heart-prototype__intro>div>p{color:var(--letters-red);font-family:var(--font-mono,monospace);letter-spacing:.12em;text-transform:uppercase;font-size:.62rem}.heart-prototype__intro h2{letter-spacing:-.06em;margin:1.6rem 0 0;font-family:Georgia,serif;font-size:clamp(3rem,7vw,7rem);font-weight:400;line-height:.9}.heart-prototype__stage{border-block:1px solid var(--letters-rule);grid-template-columns:minmax(0,1.25fr) minmax(19rem,.75fr);margin-top:3.5rem;display:grid}.heart-prototype__letter{background:#221d19;min-height:44rem;position:relative;overflow:hidden}.heart-prototype__letter:after{content:"";background:linear-gradient(90deg,#17110de0,#0000 48%,#17110d85);position:absolute;inset:0}.heart-prototype__letter img{-o-object-fit:cover;object-fit:cover;height:100%;opacity:var(--letter-reveal);width:100%;transition:opacity 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letters-heartbeat{0%,to{opacity:.2;transform:scale(.7)}28%{opacity:1;transform:scale(1.35)}}.heart-prototype__controls{flex-direction:column;align-self:stretch;padding:clamp(1.5rem,4vw,4rem);display:flex}.heart-prototype__reading{font-family:var(--font-mono,monospace);grid-template-columns:1fr auto;display:grid}.heart-prototype__reading span{border-top:1px solid var(--letters-rule);color:var(--letters-muted);letter-spacing:.1em;text-transform:uppercase;padding:.9rem 0;font-size:.62rem}.heart-prototype__reading strong{border-top:1px solid var(--letters-rule);padding:.55rem 0;font-family:Georgia,serif;font-size:1.35rem;font-weight:400}.heart-prototype__range{font-family:var(--font-mono,monospace);grid-template-columns:1fr 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button.is-active{color:var(--letters-red)}.heart-prototype__phase-note{color:var(--letters-muted);min-height:3rem;margin:1.2rem 0 0;font-family:Georgia,serif;font-style:italic;line-height:1.45}.heart-prototype__actions{gap:.75rem;margin-top:auto;padding-top:3rem;display:grid}.heart-prototype__actions button{min-height:3.25rem;padding:.75rem 1rem}.heart-prototype__listen{background:var(--letters-ink);color:var(--letters-paper);justify-content:center;gap:.8rem;display:flex}.heart-prototype__connect{border:1px solid var(--letters-rule)}.heart-prototype__connect:disabled{cursor:not-allowed;opacity:.45}.heart-prototype__connection{color:var(--letters-muted);font-family:var(--font-mono,monospace);text-align:center;text-transform:uppercase;margin-top:.75rem;font-size:.58rem}.heart-prototype footer{color:var(--letters-muted);font-family:var(--font-mono,monospace);max-width:70ch;padding-top:1rem;font-size:.58rem;line-height:1.6}@media 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