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/* The Learning Collection — sculptural edition */
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/* Collection theatre — reference-led rebuild */
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VietnamHeavy,Arial,sans-serif;letter-spacing:-.04em}
@media(max-width:1000px) and (min-width:701px){.chapter-head h2{font-size:7vw}.chapter-copy{width:31%}.chapter-copy h3{font-size:3.6vw}.chapter-copy .description{font-size:11px}}
@media(max-width:700px){html{scroll-padding-top:0}header{height:95px;padding:0}.brand{top:16px;gap:4px}.brand img{height:39px;width:37px}.brand span{font-size:15px}.brand small{font-size:5px}.menu-toggle{left:16px;top:25px}.header-cta{top:37px;right:18px;font-size:8px;max-width:74px;text-align:right;line-height:1.5}.menu-toggle span{width:23px}.menu-toggle{gap:5px}nav{top:0!important;padding:125px 10vw 50px;gap:20px}.menu-open .menu-toggle span:nth-child(1){transform:translateY(6px) rotate(45deg)}.menu-open .menu-toggle span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}nav a{font-size:30px}.hero-scroll,.hero{height:100svh;min-height:640px}.hero-books{left:22%;top:29%;width:56%;height:45%}.carousel-captions{display:block;bottom:17%;left:12%;right:12%}.carousel-neighbour{display:none}.carousel-selected strong{font-size:20px}.carousel-selected span{font-size:10px;line-height:1.6;margin-top:8px}.carousel-arrow{width:32px;height:32px;font-size:18px;top:48%;background:#18384966}.carousel-arrow.prev{left:14px}.carousel-arrow.next{right:14px}.hero-bottom{bottom:30px;left:6%;right:6%;flex-wrap:wrap;justify-content:center;gap:18px;font-size:7px}.hero-bottom>span:first-child{display:block;width:100%;text-align:center;font-size:6px;opacity:.65}.hero-bottom a span{font-size:15px}.collection-ribbon{padding:18px 0;font-size:21px;gap:25px}.chapter{height:250svh}.chapter .sticky{min-height:690px}.chapter-head{top:17%;left:6%;right:6%;text-align:left}.chapter-head>p{font-size:7px;letter-spacing:.15em;margin-bottom:14px}.chapter-head h2{font-size:clamp(43px,12vw,64px);line-height:1.02}.chapter-head h2 em{font-size:clamp(37px,10.5vw,58px)}.chapter-copy{top:16%;left:6%;width:88%}.chapter-copy h3{font-size:31px;line-height:1.08;margin:10px 0 12px;max-width:340px}.chapter-copy .description{font-size:10px;line-height:1.6;max-width:320px}.chapter-copy .eyebrow{font-size:6px}.chapter-facts{right:6%;top:auto;bottom:22%;font-size:6px;gap:5px}.chapter-facts strong{font-size:18px}.chapter.opened .chapter-facts{opacity:0}.chapter-action{bottom:9%;left:6%;right:6%;justify-content:center;gap:10px}.chapter-action .button{font-size:9px;padding:12px 15px;gap:12px}.chapter-marquee{top:38%;font-size:13vw;transform:rotate(-13deg)}.chapter-bottom{bottom:19px;left:6%;right:6%;font-size:6px}.sample-label{bottom:18%;left:6%;right:6%;font-size:6px;text-align:center}.scene{width:42vw;left:56%;top:57%}.catalog{padding:70px 6vw}.catalog h2{font-size:40px}.filters button{padding:9px 11px;font-size:10px}.book-grid{gap:25px 6px}.book-card{padding:0 7px 12px}.card-art{height:220px;padding:25px 7px 30px}.shelf-book{width:111px;height:157px;max-width:90%}.card-category{font-size:7px}.book-card h3{font-size:11px;line-height:1.5}.card-bottom{gap:6px}.how{padding:65px 6vw}.how h2{font-size:37px}.steps article>span{font-size:39px}.steps article{padding:20px 0}.dialog-layout h2{font-size:24px}.opening-mark>span{font-size:30px}.opening-mark img{height:70px}.opening-mark small{font-size:6px}}
@media(prefers-reduced-motion:reduce){.opening{display:none}.collection-ribbon span{animation:none}.chapter{height:auto}.chapter-head{display:none}.chapter-copy{opacity:1;transform:none}.chapter .sticky{position:relative;min-height:800px}.sample-label{display:none}nav{transition:none}.chapter-facts{display:none}}
html{scroll-padding-top:0}.carousel-hit{pointer-events:none}.carousel-hit button{pointer-events:auto}header.scrolled .brand{filter:none}header.menu-open .brand{color:#f7eedc}

.no-webgl .carousel-arrow,.no-webgl .carousel-neighbour{display:none}
/* Complete catalogue: one interactive scene for every title. */
.collection-controls{position:absolute;z-index:5;top:123px;left:50%;transform:translateX(-50%);display:flex;gap:18px;align-items:end;width:min(680px,78vw);color:#f2e4cc}.collection-controls label{display:flex;flex-direction:column;gap:5px;min-width:0}.collection-controls label:first-child{width:175px;flex-shrink:0}.collection-controls label:nth-child(2){flex:1}.collection-controls label>span{font-size:6px;letter-spacing:.17em;opacity:.6}.collection-controls select{width:100%;min-width:0;background:#18384bba;border:1px solid #ead6b730;border-radius:0;color:#eee4d2;padding:9px 10px;font-size:10px;text-overflow:ellipsis}.collection-controls option,.collection-controls optgroup{background:#18384b;color:#f6eddf}#collection-count{white-space:nowrap;font-size:9px;padding-bottom:12px;min-width:40px;color:#d9c39a}.carousel-selected strong{font-size:clamp(14px,1.7vw,24px);line-height:1.2;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;max-width:530px;margin:auto}.carousel-selected span{max-width:450px;margin:8px auto 0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.carousel-neighbour{font-size:clamp(12px,1.5vw,20px);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.carousel-arrow:disabled,.carousel-neighbour:disabled{opacity:.15;cursor:default}.chapter-head{max-width:46%}.chapter-head h2{font-size:clamp(48px,6vw,85px)}.chapter-head h2 em{font-size:clamp(36px,4.8vw,68px);line-height:1.08;display:block;max-width:600px;margin-top:8px}.chapter.long-title .chapter-head h2 em{font-size:clamp(30px,3.5vw,50px)}.chapter-copy .description{display:-webkit-box;-webkit-line-clamp:6;-webkit-box-orient:vertical;overflow:hidden}.chapter-facts{max-width:210px;line-height:1.5}.viewer-next{display:flex;justify-content:space-between;align-items:center;padding:24px 5%;gap:15px;background:#17384a;color:#f4e8d2}.viewer-next button{background:transparent;border:1px solid #ffffff38;color:inherit;font-size:11px;padding:13px 18px}.viewer-next a{font-size:10px}.viewer-next button:hover{background:#e9d6b3;color:#17384a}nav{gap:7px;padding-top:130px;padding-bottom:35px;overflow-y:auto}nav a{font-size:clamp(24px,3vw,40px)}nav small{margin-top:15px}.no-webgl .carousel-arrow,.no-webgl .carousel-neighbour{display:block}.no-webgl .hero-books{pointer-events:none}
@media(max-width:700px){.collection-controls{top:119px;gap:10px;width:88%;flex-wrap:wrap}.collection-controls label:first-child{width:118px}.collection-controls label:nth-child(2){min-width:150px}.collection-controls label>span{font-size:5px}.collection-controls select{font-size:8px;padding:8px 6px}#collection-count{position:absolute;right:0;top:58px;font-size:7px}.carousel-captions{bottom:16%;left:8%;right:8%}.carousel-selected strong{font-size:18px;max-width:330px}.carousel-selected span{font-size:9px}.carousel-neighbour{display:none}.chapter-head{left:6%;right:6%;max-width:none;top:16%}.chapter-head h2{font-size:42px}.chapter-head h2 em{font-size:34px;max-width:340px;line-height:1.05;margin-top:7px}.chapter.long-title .chapter-head h2 em{font-size:27px}.chapter-copy h3{font-size:28px}.chapter-copy .description{-webkit-line-clamp:4;max-width:330px}.chapter-facts{max-width:145px}.viewer-next{padding:20px 6%;flex-wrap:wrap}.viewer-next button{font-size:9px;padding:11px 14px}.viewer-next a{font-size:8px;order:3;width:100%;text-align:center;margin-top:4px}nav{padding:115px 10vw 30px;gap:10px}nav a{font-size:25px}.no-webgl .carousel-neighbour{display:none}}

html{scroll-behavior:auto}
/* Explore and purchase interaction motion */
.button,.detail-button,#hero-explore{position:relative;isolation:isolate;overflow:hidden;transform-origin:center;transition:transform .25s cubic-bezier(.2,.75,.2,1),box-shadow .25s,background .25s,color .25s}.button:before{content:'';position:absolute;inset:-50% -80%;pointer-events:none;background:linear-gradient(110deg,transparent 35%,#ffffff4a 48%,transparent 60%);transform:translateX(-75%);transition:transform .65s cubic-bezier(.2,.75,.2,1);z-index:0}.button:hover:before,.button:focus-visible:before{transform:translateX(75%)}.button:hover{transform:translateY(-4px);box-shadow:0 8px 18px #152e4422}.button:active,.detail-button:active,#hero-explore:active{transform:translateY(1px) scale(.97);box-shadow:0 1px 3px #152e4422}.cta-arrow,.button>span:not(.action-ripple){display:inline-block;position:relative;transition:transform .3s cubic-bezier(.2,.75,.2,1)}.button:hover .cta-arrow,.detail-button:hover .cta-arrow,.button:focus-visible .cta-arrow{transform:translate(3px,-3px)}.action-ripple{position:absolute!important;display:block;border-radius:50%;background:currentColor;pointer-events:none;opacity:0;z-index:-1;animation:action-ripple .6s ease-out forwards}.detail-button{padding:9px 3px;display:inline-flex;align-items:center;gap:8px}.detail-button:after{content:'';position:absolute;height:2px;left:0;bottom:0;background:currentColor;width:100%;transform:scaleX(0);transform-origin:left;transition:transform .35s}.detail-button:hover:after,.detail-button:focus-visible:after{transform:scaleX(1)}#hero-explore{padding:10px 15px;margin:-10px -15px;display:flex;align-items:center}#hero-explore:hover>span{animation:explore-arrow .8s ease-in-out infinite}.buy{box-shadow:0 4px 0 #091d2b}.buy:hover,.buy:focus-visible{background:#dfc18a;color:#17364a;box-shadow:0 7px 0 #a78d5f}.buy.leaving .cta-arrow{animation:purchase-arrow .7s ease both}.buy.leaving{animation:purchase-tap .65s ease both}.chapter.arriving .chapter-head{animation:chapter-copy-in .65s cubic-bezier(.2,.75,.2,1) both}.chapter.arriving .chapter-action{animation:chapter-copy-in .65s .12s cubic-bezier(.2,.75,.2,1) both}
@keyframes action-ripple{0%{transform:scale(0);opacity:.18}100%{transform:scale(1);opacity:0}}@keyframes explore-arrow{50%{transform:translateY(5px)}}@keyframes purchase-arrow{45%{transform:translate(16px,-16px);opacity:0}46%{transform:translate(-12px,12px);opacity:0}100%{transform:none;opacity:1}}@keyframes purchase-tap{0%,100%{transform:none}25%{transform:scale(.97)}60%{transform:translateY(-3px)}}@keyframes chapter-copy-in{from{opacity:0;transform:translateY(23px)}to{opacity:1;transform:none}}
dialog{border-radius:10px;max-width:1000px;box-shadow:0 30px 100px #001d3670}dialog[open]:not(.closing){animation:details-unfold .48s cubic-bezier(.16,.8,.24,1) both}dialog[open]::backdrop{animation:details-backdrop .35s ease both}dialog.closing{animation:details-close .2s ease-in both}dialog.closing::backdrop{animation:details-backdrop-out .2s ease-in both}.dialog-layout{grid-template-columns:36% 1fr;padding:48px;gap:43px;align-items:start}.dialog-book-stage{position:sticky;top:28px;perspective:1000px;padding:30px 20px 55px;min-width:0;isolation:isolate}.dialog-book-glow{position:absolute;inset:12% -12% 7%;background:radial-gradient(ellipse,#e3c99066,transparent 68%);z-index:-1}.dialog-book-solid{position:relative;transform-style:preserve-3d;transform:rotateX(var(--book-x,4deg)) rotateY(var(--book-y,-18deg)) rotateZ(-4deg);transition:transform .45s cubic-bezier(.2,.75,.2,1);aspect-ratio:.707;width:100%;box-shadow:25px 30px 35px #17334722}.dialog-book-solid img{height:100%;width:100%;object-fit:fill;transform:translateZ(9px);position:relative;box-shadow:none;border-radius:0 2px 2px 0;backface-visibility:hidden}.dialog-book-solid:after{content:'';position:absolute;inset:0;background:linear-gradient(90deg,#0004,transparent 8%,#ffffff13 50%,transparent);transform:translateZ(9.5px);pointer-events:none}.dialog-book-solid:before{content:'';position:absolute;inset:0;background:#14354a;transform:translateZ(-9px)}.dialog-book-spine{position:absolute;width:18px;height:100%;left:-9px;top:0;background:linear-gradient(90deg,#b59a65,#e0c99a,#b99b67);transform:rotateY(90deg)}.dialog-book-pages{position:absolute;right:-8px;top:3px;bottom:3px;width:16px;background:repeating-linear-gradient(90deg,#d3c7ac 0 1px,#faf3e1 1px 3px);transform:rotateY(90deg)}.dialog-book-caption{display:block;margin-top:36px;text-align:center;font-size:7px;letter-spacing:.2em;color:#8b7c59}.dialog-info{min-width:0}.dialog-info>p,.dialog-info>h2,.dialog-info>ul,.dialog-info>.price,.dialog-info>.actions{animation:detail-line-in .42s cubic-bezier(.2,.75,.2,1) both}.dialog-info>:nth-child(2){animation-delay:.06s}.dialog-info>:nth-child(3){animation-delay:.10s}.dialog-info>:nth-child(4){animation-delay:.14s}.dialog-info>:nth-child(5){animation-delay:.18s}.dialog-info>:nth-child(6){animation-delay:.22s}.dialog-info>:nth-child(7){animation-delay:.26s}.dialog-book-stage{animation:book-arrival .7s cubic-bezier(.16,.8,.24,1) both}.dialog-close{transition:transform .3s,background .3s}.dialog-close:hover{transform:rotate(90deg);background:#e5d9be}.dialog-info .actions .button{gap:18px}.dialog-info .actions .cta-arrow{font-size:17px}.dialog-info .price{color:#173a4e}
@keyframes details-unfold{from{opacity:0;transform:perspective(1200px) translateY(35px) rotateX(5deg) scale(.94)}to{opacity:1;transform:none}}@keyframes details-close{to{opacity:0;transform:translateY(18px) scale(.97)}}@keyframes details-backdrop{from{background:#0b1d2c00;backdrop-filter:blur(0)}to{background:#0b1d2ccc;backdrop-filter:blur(8px)}}@keyframes details-backdrop-out{from{background:#0b1d2ccc;backdrop-filter:blur(8px)}to{background:#0b1d2c00;backdrop-filter:blur(0)}}@keyframes detail-line-in{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}@keyframes book-arrival{from{opacity:0;transform:translateX(-28px) rotateY(13deg) scale(.9)}to{opacity:1;transform:none}}
@media(max-width:700px){.dialog-layout{grid-template-columns:1fr;padding:36px 25px;gap:14px}.dialog-book-stage{position:relative;top:auto;width:50%;margin:0 auto;padding:12px 0 10px}.dialog-book-caption{font-size:6px;margin-top:18px}.dialog-info .actions{gap:10px}.dialog-info .actions .button{gap:12px;padding:14px 16px}.dialog-layout h2{margin-top:12px}.dialog-info .price{margin:22px 0}.detail-button{font-size:9px;gap:4px}.button:hover{transform:translateY(-2px)}}
@media(prefers-reduced-motion:reduce){.button:before{display:none}.action-ripple{display:none}dialog,dialog::backdrop,.dialog-book-stage,.dialog-info>*,.buy,.buy .cta-arrow,.chapter.arriving .chapter-head,.chapter.arriving .chapter-action,#hero-explore>span{animation:none!important}.dialog-book-solid{transform:rotateY(-15deg)}.button:hover,.button:active,.detail-button:active,#hero-explore:active,.dialog-close:hover{transform:none}.button:hover .cta-arrow,.detail-button:hover .cta-arrow{transform:none}}

/* One motion rhythm across discovery, book details and checkout. */
:root{--motion-ease:cubic-bezier(.22,.75,.24,1);--motion-fast:180ms;--motion-base:320ms;--motion-scene:420ms}
@view-transition{navigation:auto}
::view-transition-old(root){animation:scene-out 220ms var(--motion-ease) both}
::view-transition-new(root){animation:scene-in 360ms var(--motion-ease) both}
@keyframes scene-out{to{opacity:0}}
@keyframes scene-in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
@media(prefers-reduced-motion:reduce){::view-transition-old(root),::view-transition-new(root){animation:none!important}*,*:before,*:after{transition-duration:.01ms!important}}

/* Stable, responsive scene navigation. */
.webgl-stage.dragging{cursor:grabbing}.hero .webgl-stage{user-select:none;-webkit-user-select:none}
.chapter-head,.chapter-copy,.chapter-facts,.chapter-action{transition-timing-function:var(--motion-ease)}
.button,.detail-button,#hero-explore,.dialog-book-solid{transition-timing-function:var(--motion-ease)}
.button:hover{transform:translateY(-2px)}.buy{box-shadow:none}.buy:hover{box-shadow:0 5px 14px #17384a18}
dialog[open]:not(.closing){animation:details-unfold 320ms var(--motion-ease) both}.dialog-book-stage{animation:book-arrival 420ms var(--motion-ease) both}.dialog-info>*{animation-delay:0s!important;animation-duration:320ms!important}
@keyframes details-unfold{from{opacity:0;transform:translateY(16px) scale(.985)}to{opacity:1;transform:none}}
@keyframes book-arrival{from{opacity:0;transform:translateX(-10px)}to{opacity:1;transform:none}}

.reader-navigation{position:absolute;right:5%;bottom:12%;z-index:6;display:flex;align-items:center;gap:14px;font-size:10px;font-variant-numeric:tabular-nums}.reader-navigation button{width:44px;height:44px;border:1px solid currentColor;border-radius:50%;background:transparent;color:inherit;font-size:20px;transition:background var(--motion-fast),transform var(--motion-fast) var(--motion-ease)}.reader-navigation button:hover{background:#fff8e699}.reader-navigation button:active{transform:scale(.94)}
@media(max-width:700px){.reader-navigation{right:6%;bottom:18%;gap:10px;font-size:8px}.reader-navigation button{width:38px;height:38px;font-size:18px}}

::view-transition,::view-transition-group(root),::view-transition-image-pair(root),::view-transition-old(root),::view-transition-new(root){pointer-events:none}

.button,.chapter-action .button{border-radius:6px}.curtain{transition-duration:1.05s}.opening{transition-delay:1.1s}@media(max-width:700px){.sample-label{bottom:16%}}