.intro-feature{margin-top:64px;padding-top:48px;border-top:1px solid #dedce6;line-height:2}.intro-feature h2{font-size:clamp(26px,4vw,38px);line-height:1.6}.intro-feature h3{margin-top:36px;font-size:24px}.intro-feature .help{font-size:13px;color:#676374}.anniversary-video{display:block;width:100%;aspect-ratio:16/9;background:#171625}.anniversary-book{margin:24px 0;background:#eeedf3;padding:24px;border-radius:6px}.book-toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:20px}.anniversary-book img{display:block;width:100%;max-height:80vh;object-fit:contain;filter:drop-shadow(0 4px 8px #0002)}.book-toolbar button:disabled{opacity:.35;cursor:default}@media(max-width:600px){.anniversary-book{padding:12px}.book-toolbar .outline{padding:10px}.intro-feature{margin-top:40px}}

.book-paper{display:block;width:100%;padding:0;border:0;background:transparent;cursor:pointer}.book-expanded{position:fixed;inset:8px;z-index:9999;margin:0;overflow:auto}.book-expanded .book-toolbar{position:sticky;top:0;background:#eeedf3;padding:10px;z-index:2}.book-expanded img{max-height:calc(100vh - 140px)}.book-toolbar{flex-wrap:wrap}.book-toolbar [data-book-status]{white-space:nowrap}
.book-paper{position:relative;perspective:1800px;isolation:isolate;overflow:visible}.book-paper>img{height:auto;max-height:none}.book-fixed-half,.book-leaf{position:absolute;top:0;bottom:0;width:50%;pointer-events:none}.book-fixed-half{left:0;background-size:200% 100%;background-position:left center;z-index:2}.book-leaf{left:50%;transform-origin:left center;transform-style:preserve-3d;z-index:3}.book-leaf-front,.book-leaf-back{position:absolute;inset:0;background-size:200% 100%;backface-visibility:hidden;background-color:#fff;box-shadow:0 6px 22px #0003}.book-leaf-front{background-position:right center}.book-leaf-back{background-position:left center;transform:rotateY(180deg)}.book-leaf-front:after,.book-leaf-back:after{content:'';position:absolute;inset:0;background:linear-gradient(90deg,#0003,transparent 18%,#fff2 75%,#0001);pointer-events:none}.book-reverse .book-fixed-half{left:50%;background-position:right center}.book-reverse .book-leaf{left:0;transform-origin:right center}.book-reverse .book-leaf-front{background-position:left center}.book-reverse .book-leaf-back{background-position:right center}.book-turning:after{content:'';position:absolute;top:0;bottom:0;left:50%;width:12px;background:linear-gradient(90deg,#0003,transparent);z-index:1}.book-expanded .book-paper{max-width:1100px;margin:auto}.book-expanded .book-paper>img{max-height:none}