.hb-book .hb-reading-grain{display:none}
/* Explicit author-letter close controls, shared by desktop and mobile. */
.hb-book .hb-letter-close{display:none;min-height:44px;padding:10px 20px;border:1px solid #b89b70;border-radius:2px;background:#0b0b0dea;color:#eadbc3;font:20px/1.2 var(--serif);cursor:pointer;position:relative;z-index:4}
.hb-book .hb-letter[open]>.hb-letter-close{display:block;width:max-content;max-width:90%;margin:0 auto 18px}
.hb-book .hb-letter[open]>.hb-letter-close-bottom{margin:22px auto 0}
.hb-book .hb-letter-close:focus-visible{outline:2px solid #f7e3b9;outline-offset:4px}
@media(min-width:701px){.hb-book .hb-letter[open] summary{bottom:65px}.hb-book .hb-letter-paper{margin-bottom:0}}
@media(max-width:700px){
 .hb-book .hb-cover-wrap{display:none!important}
 .hb-book .hb-book-cover{cursor:default;opacity:1;pointer-events:none}
 .hb-book.hb-reading{background:#080c10;min-height:100svh;padding-bottom:calc(100px + env(safe-area-inset-bottom))}
 .hb-book-1.hb-reading{background:#110d13}
 .hb-book.hb-reading>.hb-back,.hb-book.hb-reading .hb-book-opening,.hb-book.hb-reading .hb-book-materials> :not(section:first-child),.hb-book.hb-reading .hb-end-star{display:none}
 .hb-book.hb-reading .hb-book-materials{margin:0;padding:58px 12px 0;background:transparent}
 .hb-book.hb-reading .hb-book-materials:before{inset:0;opacity:.45;background-size:100% auto}
 .hb-book.hb-reading .hb-book-materials>section:first-child{margin:0;padding:0;scroll-margin-top:0}
 .hb-book.hb-reading h2{font:400 clamp(30px,8vw,38px)/1.15 var(--serif);margin:10px 0 20px}
 .hb-book.hb-reading h2:before,.hb-book.hb-reading h2:after{display:none}
 .hb-book.hb-reading .hb-letter{position:relative;padding:0 0 12px}
 .hb-book.hb-reading .hb-letter summary{position:absolute;left:0;bottom:72px;width:39%;margin:0;min-height:0;z-index:3}
 .hb-book.hb-reading .hb-letter summary>.hb-author-envelope{width:100%;padding:0}
 .hb-book.hb-reading .hb-author-name{display:none}
 .hb-book.hb-reading .hb-letter-paper{position:relative;isolation:isolate;width:100%;margin:0;padding:32px clamp(36px,9.7vw,42px) 112px;background:none;border:0;box-shadow:none;color:#3d3027;font:400 clamp(19px,5vw,22px)/1.4 var(--serif)}
 .hb-book.hb-reading .hb-letter-paper:before{content:'';position:absolute;inset:0;z-index:-2;border:28px solid transparent;border-image:url('assets/vault/fidelity/torn-paper.webp') 90 fill / 28px / 0 stretch round;pointer-events:none}
 .hb-book.hb-reading .hb-reading-grain{display:block;position:absolute;inset:12px;width:calc(100% - 24px);height:calc(100% - 24px);z-index:-1;pointer-events:none;mask-image:linear-gradient(90deg,transparent,#000 26px,#000 calc(100% - 26px),transparent),linear-gradient(transparent,#000 26px,#000 calc(100% - 26px),transparent);mask-composite:intersect}
 .hb-book.hb-reading .hb-letter-paper p{font:inherit;white-space:pre-line;margin:0 0 1em}
 .hb-book.hb-reading .hb-letter-paper .hb-signature{font:400 32px/1.2 'Caveat',cursive;font-style:normal!important;text-align:right;margin:20px 0 0}
}
@media(prefers-reduced-motion:reduce){.hb-book .hb-letter,.hb-book .hb-letter-paper{animation:none!important;transition:none!important;scroll-behavior:auto}}