/* A hidden library rests on the grass beneath the left-hand tree. */
#river .ghost-books-portal{position:absolute;left:4.5%;bottom:21%;width:9%;min-width:44px;min-height:44px;aspect-ratio:1526/1031;display:grid;place-items:center;z-index:5;pointer-events:auto;touch-action:manipulation;border:0;background:transparent;border-radius:12px;cursor:default;-webkit-tap-highlight-color:transparent}
#river .ghost-books-portal::before{content:"";position:absolute;inset:-20% -24% -8%;z-index:0;border-radius:50%;background:radial-gradient(ellipse,rgba(174,255,195,.36),rgba(73,250,130,.25) 28%,rgba(28,205,89,.1) 52%,transparent 74%);filter:blur(clamp(5px,.8vw,13px));mix-blend-mode:screen;pointer-events:none;animation:book-aura-breathe 6s ease-in-out infinite}
#river .ghost-books-portal::after{content:"";position:absolute;left:-15%;right:-15%;bottom:-8%;height:28%;z-index:0;border-radius:50%;background:radial-gradient(ellipse,rgba(165,255,188,.5),rgba(40,226,111,.24) 38%,transparent 72%);filter:blur(5px);pointer-events:none;animation:book-ground-breathe 6s ease-in-out infinite}
#river .ghost-books-portal img{position:relative;z-index:1;display:block;width:100%;height:auto;opacity:.5;filter:drop-shadow(0 0 3px #b8ffce) drop-shadow(0 0 10px #50fa8c) drop-shadow(0 0 20px #20d96788);animation:ghost-books-hover 6s ease-in-out infinite;pointer-events:none}
#river .ghost-books-portal:focus-visible{outline:2px solid #caffd5;outline-offset:5px}
#river .ghost-books-portal:focus-visible::before{background:radial-gradient(ellipse,rgba(112,255,157,.45),rgba(54,236,114,.18) 48%,transparent 74%)}
@keyframes ghost-books-hover{0%,100%{transform:translateY(0) rotate(-1deg)}50%{transform:translateY(-5px) rotate(1deg)}}
@keyframes book-aura-breathe{0%,100%{opacity:.6;transform:scale(.94)}50%{opacity:1;transform:scale(1.05)}}
@keyframes book-ground-breathe{0%,100%{opacity:.65;transform:scaleX(.94)}50%{opacity:1;transform:scaleX(1.08)}}
@media(max-width:650px){#river .ghost-books-portal{left:4%;bottom:20%}#river .ghost-books-portal::before{filter:blur(4px)}}
@media(prefers-reduced-motion:reduce){#river .ghost-books-portal img,#river .ghost-books-portal::before,#river .ghost-books-portal::after{animation:none}}
.still #river .ghost-books-portal img,.still #river .ghost-books-portal::before,.still #river .ghost-books-portal::after{animation:none}