/* A tactile room and open-book presentation; learning state stays in the app. */
body.book-room{background:#88613e url('/assets/book-room.png') center center/cover fixed;color:#28483d;min-height:100vh}
body.book-room:before{content:'';position:fixed;inset:0;background:linear-gradient(#21190d18,#21190d00 55%,#21190d26);pointer-events:none;z-index:-1}
body.book-room>header,body.book-room #app>header{background:#392b1bcc;border:1px solid #ebc78355;border-radius:22px;max-width:1180px;margin:18px auto;padding:12px 22px;box-shadow:0 7px 0 #32231566,0 18px 35px #0003;color:#fff0c9}
body.book-room .brand,body.book-room .brand small{color:#fff0c9}
body.book-room button:not(.sentence-word):not(.word):not(.token),body.book-room a.primary,body.book-room a.secondary,body.book-room .ghost{border:1px solid #b8914d;border-bottom:5px solid #8d652f;background:linear-gradient(170deg,#fff9df,#efd39a);box-shadow:inset 0 2px 1px #fff,0 5px 10px #36261726;color:#3d513b;border-radius:16px;transition:transform .18s,box-shadow .18s;position:relative}
body.book-room button:hover:not(:disabled):not(.token),body.book-room a.primary:hover,body.book-room a.secondary:hover{transform:translateY(-3px);box-shadow:inset 0 2px 1px #fff,0 9px 16px #36261740}
body.book-room button:active:not(:disabled):not(.token),body.book-room a.primary:active{transform:translateY(3px);border-bottom-width:2px}
body.book-room button.primary,body.book-room a.primary{background:linear-gradient(155deg,#ffeeb0,#e9b750);border-bottom-color:#a57728;color:#483114}
body.book-room button:disabled{filter:saturate(.25);opacity:.6;box-shadow:none;transform:none}
body.book-room button:focus-visible,body.book-room a:focus-visible{outline:3px solid #418c80;outline-offset:5px}
body.book-room .paper{background:linear-gradient(105deg,#e9d7ad,#fff8e5 6%,#fbefd1 94%,#e2c99b);border-color:#b99158;box-shadow:0 7px 0 #deccab,0 11px 0 #a17a45,0 24px 45px #30231355}
body.book-room .shelf{background:none;border:0;box-shadow:none;max-width:1100px;margin:0 auto;padding:30px 40px 70px;min-height:100vh}
.book-room .shelf-top{margin:0 0 20px;color:#fff4d4;text-shadow:0 3px 10px #312417}.book-room .shelf-top h1{color:#fff4d4;font:42px Georgia,serif}.book-room .shelf-top .eyebrow{color:#ffe6ad}
.book-room .book-grid{position:relative;perspective:1400px;gap:90px;padding:45px 50px 20px;margin-top:30px;align-items:end}
.book-room .book-grid:after{content:'';position:absolute;left:-30px;right:-30px;bottom:135px;height:27px;background:linear-gradient(#dba365,#a26730 45%,#643c20 50%,#b57940);border:1px solid #663d1d;box-shadow:0 18px 25px #35231566;z-index:-1;transform:rotateX(12deg)}
.book-room .book-card{background:none;position:relative;min-width:0}.book-room .book-cover{height:340px;transition:transform .45s;transform:rotateY(-12deg) rotateZ(-2deg);transform-style:preserve-3d;margin-bottom:24px}
.book-room .book-card:nth-child(2) .book-cover{transform:rotateY(12deg) rotateZ(2deg)}
.book-room .book-card:hover .book-cover{transform:translateY(-14px) rotateY(-3deg) rotateZ(0)}
.book-room .book-cover img{border-radius:3px 8px 8px 3px;box-shadow:7px 2px 0 #f5e6c7,11px 4px 0 #916d43,18px 22px 22px #22160970;max-width:100%}
.book-room .book-cover-link{display:block;outline-offset:12px}.book-room .book-card>p{background:#fff5dbe8;border:1px solid #c8a361;border-radius:16px;padding:8px 14px;font-size:14px}.book-room .shelf .badge{background:#423822;color:#ffe5a5;border-color:#c39b58}
.book-room .chapter-volume{max-width:1110px;padding:45px 50px 50px;border-radius:12px 28px 28px 12px;position:relative;isolation:isolate;animation:volume-arrive .65s ease-out}
.book-room .chapter-volume:before{content:'';position:absolute;left:50%;top:0;bottom:0;width:36px;transform:translateX(-50%);background:linear-gradient(90deg,transparent,#806b3b1c,#fff8e660,transparent);pointer-events:none;z-index:-1}
.book-room .chapter-volume>.cards{grid-template-columns:repeat(2,minmax(0,1fr));gap:15px 60px}.book-room .chapter-volume>.cards>.card{min-height:120px;border:0;border-bottom:1px solid #c3a675;border-radius:3px;background:#fffaf066;box-shadow:none;padding:18px 20px;transition:background .2s,transform .2s;display:block;text-decoration:none}
.book-room .chapter-volume>.cards>a:hover{background:#fff9e6;transform:translateY(-4px);box-shadow:0 8px 18px #8e6a3520}.book-room .chapter-volume h3{font-size:24px;margin:8px 0}.book-room .chapter-locked{opacity:.5}
body.book-room.reading-focus,body.book-room.question-focus{background-image:linear-gradient(#15170fc9,#15170fd9),url('/assets/book-room.png')}
.book-room .reading-layout{max-width:1280px!important;display:grid!important;grid-template-columns:minmax(280px,.85fr) minmax(420px,1.15fr);gap:0!important;padding:0 20px!important;align-items:start;margin:35px auto 65px!important;perspective:1400px}
.book-room .reading-layout>.side{display:none!important}.book-room .reading-layout>.reader{grid-column:2;grid-row:1;max-width:none!important;width:100%;margin:0!important;border-radius:4px 24px 24px 3px!important;padding:32px!important;min-height:640px;box-shadow:8px 6px 0 #d8c4a0,12px 10px 0 #715135,0 30px 60px #0007!important;transform-origin:left center;animation:page-open .7s ease-out}
.book-room .reading-layout .passage{font-size:23px!important;line-height:1.85!important}.book-room .reading-layout .passage span{transform:none}
.book-room .room-picture-page{grid-column:1;grid-row:1;position:sticky;top:22px;margin:0;min-height:640px;padding:30px 26px;background:linear-gradient(90deg,#f6eacb 88%,#c5ac7e);border-radius:24px 3px 3px 24px;box-shadow:-7px 6px 0 #ddcba6,-11px 10px 0 #715135,0 30px 60px #0007;display:flex;flex-direction:column;justify-content:center;gap:22px}
.room-picture-window{aspect-ratio:1.3;background-size:200% 200%;background-position:left top;border:8px solid #fff5da;border-radius:16px;box-shadow:0 14px 25px #58371f50;transform:rotate(-2deg)}
.room-picture-page figcaption{text-align:center;font:23px Georgia,serif;color:#705233}.room-picture-page .room-page-mark{text-align:center;font:12px system-ui;letter-spacing:3px;color:#9a7947}
.book-room.question-focus .quest-stage{animation:page-open .55s ease-out;border-bottom:7px solid #c5ae83;border-right:7px solid #e1d1ae}
.book-flight{position:fixed;inset:0;z-index:50000;background:#211c15b8;display:grid;place-items:center;perspective:1400px;pointer-events:auto}.book-flight-volume{position:relative;width:min(36vw,280px);aspect-ratio:857/1109;transform-style:preserve-3d;box-shadow:12px 12px 0 #bd9d69,0 25px 65px #0008;background:#fff0cd;border-radius:4px 14px 14px 4px;animation:book-fly 1s cubic-bezier(.2,.7,.2,1) both}.book-flight-volume:after{content:'';position:absolute;inset:10px;border:1px solid #c9ac71;background:repeating-linear-gradient(transparent 0 25px,#b29a6925 26px 27px);z-index:0}.book-flight-volume img{position:absolute;inset:0;width:100%;height:100%;object-fit:fill;transform-origin:left center;backface-visibility:visible;z-index:2;border-radius:3px 10px 10px 3px;animation:cover-open 1s ease-in-out both}.book-flight span{position:absolute;bottom:10%;color:#fff0c9;font:20px Georgia,serif}
@keyframes book-fly{0%{transform:translate(var(--flight-x),var(--flight-y)) scale(.55) rotateY(-24deg)}55%{transform:translate(0,0) scale(1) rotateY(0)}100%{transform:translate(10%,0) scale(1.12) rotateY(-8deg)}}
@keyframes cover-open{0%,50%{transform:rotateY(0)}100%{transform:rotateY(-150deg)}}@keyframes page-open{from{opacity:0;transform:rotateY(-12deg) translateY(14px)}to{opacity:1;transform:none}}@keyframes volume-arrive{from{opacity:0;transform:translateY(22px) scale(.97)}to{opacity:1;transform:none}}
@media(max-width:760px){.book-room .shelf{padding:20px 18px}.book-room .book-grid{gap:28px;padding:25px 12px;grid-template-columns:repeat(2,minmax(0,1fr))}.book-room .book-cover{height:240px}.book-room .shelf-top h1{font-size:30px}.book-room .chapter-volume{padding:28px 22px}.book-room .chapter-volume>.cards{gap:12px 20px}.book-room .chapter-volume h3{font-size:20px}.book-room .reading-layout{display:block!important}.book-room .room-picture-page{display:none}.book-room .reading-layout>.reader{padding:25px!important}.book-flight-volume{width:45vw}}
@media(prefers-reduced-motion:reduce){.book-room *,.book-flight *{animation:none!important;transition:none!important}.book-flight{display:none}.book-room .book-cover{transform:none!important}}
.book-room .shelf>a.primary{width:auto!important;min-width:0!important;display:inline-block!important;padding:12px 24px;font-size:16px;min-height:0;margin-bottom:0}.book-room .book-card>a.primary,.book-room .book-card>a.secondary{width:auto!important;min-width:0!important;padding:12px 28px;min-height:0}.book-room .book-grid{margin-top:10px}.book-room .book-card .gloss .zh{min-height:14px;line-height:14px}

/* Consistent navigation for the bookshelf and the Book 3 reader. */
.reader-brand{font:bold 26px Georgia,serif;flex:1;min-width:210px}.reader-brand small{display:block;font:15px/1.6 Georgia,serif;opacity:.8}.reader-toolbar{display:flex;gap:9px;align-items:center;flex-wrap:wrap}.reader-toolbar .reader-tool{display:grid;place-items:center;box-sizing:border-box;position:relative;width:49px;height:49px;min-width:49px;margin:0;padding:4px;border:1px solid #d6b373;border-bottom:4px solid #95713e;border-radius:15px;background:linear-gradient(145deg,#fff7db,#dec99c);box-shadow:inset 0 2px 1px #fff8,0 5px 12px #0002;color:#294d3b;text-decoration:none;cursor:pointer}.reader-tool span{font:29px/1 'Segoe UI Emoji',sans-serif;pointer-events:none}.reader-tool:focus-visible{outline:3px solid #eabc60;outline-offset:3px}.reader-toolbar .reader-tool:disabled{opacity:.5}#shelf-toolbar{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap}@media(max-width:650px){.reader-toolbar{gap:6px}.reader-toolbar .reader-tool{width:40px;height:43px;min-width:40px}.reader-tool span{font-size:25px}.reader-brand{font-size:22px}}

/* Book 1-2 readers: the My space / My bookshelf links share the cream toolbar-toy look of the other header buttons. */
header a.ghost[data-reading-room],header a.ghost[data-bookshelf]{position:relative;display:grid;place-items:center;flex:none;box-sizing:border-box;width:49px;height:49px;min-width:49px;margin:0;padding:4px;border:1px solid #b8914d;border-bottom:5px solid #8d652f;border-radius:16px;background:linear-gradient(170deg,#fff9df,#efd39a);box-shadow:inset 0 2px 1px #fff,0 5px 10px #36261726;color:#3d513b;font:30px/1.1 'Segoe UI Emoji','Apple Color Emoji',sans-serif;text-decoration:none;text-shadow:none;filter:none}
header a.ghost[data-reading-room]:hover,header a.ghost[data-bookshelf]:hover{transform:translateY(-2px)}
@media(max-width:650px){header a.ghost[data-reading-room],header a.ghost[data-bookshelf]{width:43px;height:43px;min-width:43px;font-size:27px}}

/* Book 2 locked screen: same card and button as the Book 3-10 locked screen (book3/course.css). */
main.book-locked{box-sizing:border-box;max-width:1280px;margin:15px auto 40px;padding:28px;background:#fff7df;border:1px solid #cbb477;border-radius:22px;box-shadow:0 18px 50px #102b2855;color:#28483d;font:17px/1.65 system-ui,sans-serif;text-align:start}
main.book-locked h1{margin:.67em 0;font:700 34px/1.2 Georgia,serif;color:#28483d;letter-spacing:normal}
main.book-locked p{margin:17px 0;font:inherit;color:inherit}
main.book-locked a.button{display:inline-block;width:auto;margin:0;padding:11px 17px;font:inherit;color:#24493e;background:linear-gradient(#fff5d4,#eed098);border:1px solid #b68e45;border-bottom-width:4px;border-radius:12px;box-shadow:none;text-decoration:none;cursor:pointer}
@media(max-width:800px){main.book-locked{margin:10px;padding:20px}}