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var(--depth)/2);transform:rotateY(-90deg) translateZ(calc(var(--bw)/2))}.face.pages{width:var(--depth);left:calc(50% - var(--depth)/2);background:repeating-linear-gradient(90deg,#eee 0 1px,#fff 1px 3px);transform:rotateY(90deg) translateZ(calc(var(--bw)/2))}.book3d.open .front{transform:translateZ(calc(var(--depth)/2)) rotateY(-24deg)}.face img{width:100%;height:100%;object-fit:fill}.fallback{display:none;max-height:330px;object-fit:contain}.stage.static .book3d{display:none}.stage.static .fallback{display:block}.view-controls{display:flex;justify-content:center;flex-wrap:wrap;gap:6px;margin:16px 0}.view-controls button{font-size:12px;padding:9px 13px}.view-controls button[aria-pressed=true],.filters button[aria-pressed=true]{background:var(--green);color:white}.hint{font-size:12px;color:#687060;text-align:center}.article{max-width:820px;margin:0 auto;padding:32px 0 70px}.article h2{margin:34px 0 20px}.article p{margin:20px 0}.article pre{white-space:pre-wrap;font:inherit;line-height:2;color:#434c3d}.facts{display:grid;grid-template-columns:120px 1fr;border-top:1px solid var(--line)}.facts dt,.facts dd{padding:12px 0;border-bottom:1px solid var(--line);margin:0}.facts dt{color:#65705d}.notice{background:var(--paper);border-left:3px solid var(--sage);padding:16px 20px;font-size:13px;margin:20px 0}.filters{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:30px}.empty{padding:65px 20px;text-align:center;background:var(--paper);color:#62695f}.empty h3{color:#111;margin-bottom:10px}.form{max-width:840px;padding-bottom:70px}.form fieldset{border:0;border-top:1px solid var(--line);padding:26px 0;margin:18px 0}.form legend{font-size:22px;padding-right:20px}.fields{display:grid;grid-template-columns:1fr 1fr;gap:22px}.field{display:flex;flex-direction:column;gap:7px}.field.full{grid-column:1/-1}input:not([type=checkbox]):not([type=radio]),select,textarea{border:1px solid #adb5a5;border-radius:0;padding:12px;width:100%;background:white;min-width:0}textarea{min-height:110px;resize:vertical}.checks{display:flex;gap:12px 22px;flex-wrap:wrap}.checks label{display:flex;align-items:center;gap:8px}.error{color:#a12626;font-size:13px}.field:has([aria-invalid=true]) input{border-color:#a12626}.result{padding:24px;background:var(--paper);margin-top:22px}.skip{position:absolute;left:20px;top:-100px;z-index:50;background:white;padding:15px}.skip:focus{top:10px}.reveal{animation:appear .65s both}@keyframes appear{from{opacity:.5;transform:translateY(12px)}to{opacity:1;transform:none}}[hidden]{display:none!important}@supports not (transform-style:preserve-3d){.book3d{display:none}.fallback{display:block}}@media(max-width:1050px){.wrap{padding:0 30px}nav{gap:18px}.brand{font-size:19px}.hero{gap:32px}.book-visual{height:250px;padding:20px}.portrait{height:220px}.book-grid,.author-grid{gap:20px}.detail{gap:35px}.rail .book-card{flex-basis:calc((100% - 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.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}main:focus{outline:none}summary{cursor:pointer}.purchase summary{list-style:none}

.section-head>a{flex-shrink:0;white-space:nowrap}#reduce-motion{font-size:12px;padding:7px 12px;margin-top:12px}.reduce-motion{scroll-behavior:auto}.reduce-motion *,.reduce-motion *:before,.reduce-motion *:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}.reduce-motion .tilt{transform:none!important}.reduce-motion .tilt:after{display:none}
@media(max-width:760px){.section-head h2{font-size:26px}.section-head{gap:14px}}

/* Feedback 1: flat surfaces, clear sans-serif hierarchy, restrained glass. */
:root{--paper:#f2f5f3;--line:#e9eeeb}body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','Malgun Gothic',sans-serif;letter-spacing:-.3px}h1,h2{font-family:inherit;font-weight:750;letter-spacing:-2px}h1{line-height:1.28}h2{line-height:1.4}h3{font-weight:700}header{position:sticky;top:0;background:rgba(255,255,255,.78);backdrop-filter:blur(22px) saturate(145%);-webkit-backdrop-filter:blur(22px) saturate(145%);border-bottom:1px solid #ffffffa6;box-shadow:0 1px 0 #1e3b2f0a}.header-inner{height:88px}button,.button{border-radius:14px;border-color:transparent;background:#f1f4f2;font-weight:600;transition:background .2s,transform .2s}.button:hover,button:hover{background:#e8eee9;transform:translateY(-2px)}nav a{font-weight:600;color:#4f5a54}nav a:hover{color:var(--green)}.hero{padding:80px 0 74px;gap:60px;border:0}.hero h1{font-size:clamp(40px,4.1vw,60px);line-height:1.3}.hero p{font-size:17px;line-height:1.9}.hero-art{border-radius:32px;background:radial-gradient(ellipse at 25% 20%,#dce7d8,transparent 65%),linear-gradient(135deg,#f3f6f1,#e7eee8);min-height:340px;isolation:isolate}.hero-art:before{width:290px;height:200px;border-radius:26px;background:#ffffff55;border:1px solid #ffffffb0;backdrop-filter:blur(14px);transform:rotate(-13deg)}.hero-art img{height:235px}.eyebrow,.small-label{font-weight:700}.section{padding:64px 0}.book-visual{border-radius:22px;background:#f3f5f3;overflow:visible}.portrait,.stage{border-radius:22px}.contact-band{border-radius:28px;background:linear-gradient(120deg,#1e3b2f,#30563f)}.contact-band .button{border-radius:14px;background:#ffffff18;backdrop-filter:blur(14px);border:1px solid #ffffff40}.contact-band .button:first-child{background:#fff}.notice,.empty,.result{border-radius:16px}.search input,input:not([type=checkbox]):not([type=radio]),select,textarea{border-radius:12px;background:#f8faf8;border-color:#e0e7e1}.filters button{border-radius:24px}.news-row{padding:28px 12px;border-radius:12px}.news-row:hover{background:#f6f8f6}.rail{position:relative;padding:38px 0 36px;overflow-y:hidden;scrollbar-width:none}.rail::-webkit-scrollbar{display:none}.rail .book-card{flex:0 0 calc((100% - 84px)/4)}.rail.infinite{scroll-behavior:auto!important;overflow-x:hidden}.rail.infinite .book-card{flex:0 0 clamp(235px,23vw,280px)}.rail .book-visual{height:310px;padding:30px;isolation:isolate}.rail .book-visual:focus-visible{outline-offset:-4px}.rail .tilt{will-change:transform;transform-style:preserve-3d;transition:transform .18s ease-out}.rail .tilt:after{border-radius:2px;mix-blend-mode:screen;background:radial-gradient(ellipse at var(--gx,50%) var(--gy,50%),#fff9 0%,transparent 55%),repeating-linear-gradient(115deg,#e9baff55 0%,#99e8ff66 14%,#e3ffa855 28%,#fff0 45%);background-size:100% 100%,220% 220%;background-position:center,var(--gx,50%) var(--gy,50%)}.rail .tilt img{box-shadow:4px 10px 18px #1e3b2f24}.rail .book-visual:hover .tilt{--scale:1.12}.rail-tools{margin-top:0}.rail-tools button{background:#ffffff9c;border:1px solid #dfe8e1;backdrop-filter:blur(16px)}.press-zoom{position:relative;z-index:5}.press-zoom .tilt{transform:scale(1.16)!important;transition:transform .28s cubic-bezier(.2,.8,.2,1)}.book-visual img{-webkit-user-drag:none;user-select:none;-webkit-touch-callout:none}.zoom-layer{position:fixed;inset:0;z-index:100;background:#ffffff70;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);pointer-events:none}.zoom-layer img{object-fit:contain;transform-origin:center;box-shadow:0 24px 60px #1e3b2f35}.reduce-motion .press-zoom .tilt{transform:none!important}
@media(max-width:1050px) and (min-width:761px){.hero{gap:30px}.hero h1{font-size:46px}nav{gap:18px}}
@media(max-width:760px){.header-inner{height:76px}nav{top:76px;border-radius:0 0 24px 24px;background:#fffffff2;backdrop-filter:blur(20px)}.hero{padding:42px 0}.hero h1{font-size:40px;letter-spacing:-1.8px}.hero p{font-size:15px}.hero-art{min-height:250px;border-radius:24px}.hero-art img{height:190px}.rail .book-card{flex-basis:76%}.rail .book-visual{height:290px}.section-head h2{font-size:27px}.rail{padding-top:26px}.book-visual{border-radius:18px}.contact-band{border-radius:22px}.rail .book-visual:hover .tilt{--scale:1}.hero-art:before{width:230px;height:180px}}
@media(prefers-reduced-motion:reduce){.press-zoom .tilt{transform:none!important}}

/* Feedback 2: locally hosted Pretendard and interactive book details. */
@font-face{font-family:Pretendard;src:url('assets/PretendardVariable.woff2') format('woff2');font-weight:100 900;font-style:normal;font-display:swap}body{font-family:Pretendard,sans-serif}h1,h2,h3,button,input,select,textarea{font-family:inherit}.book-grid .book-visual{padding:30px;isolation:isolate}.book-grid .book-visual:hover .tilt{--scale:1.12}.book-grid .tilt{transform-style:preserve-3d}.book-grid .tilt:after{mix-blend-mode:screen;background:radial-gradient(ellipse at var(--gx,50%) var(--gy,50%),#fff9,transparent 55%),repeating-linear-gradient(115deg,#e9baff55 0%,#99e8ff66 14%,#e3ffa855 28%,#fff0 45%);background-size:100% 100%,220% 220%;background-position:center,var(--gx,50%) var(--gy,50%)}.price-action{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:32px;padding-top:26px;border-top:1px solid var(--line)}.price-action strong{display:block;font-size:30px;letter-spacing:-1px}.price-action small{font-size:17px;margin-left:4px;font-weight:500}.price-action .muted{font-size:13px}.book-detail-page .stage{cursor:grab;touch-action:pan-y;user-select:none}.book-detail-page .stage:active{cursor:grabbing}.book-detail-page .stage.static{cursor:default}.book3d.dragging{transition:none}.book-edge{position:absolute;left:0;top:50%;width:var(--bw);height:var(--depth);background:repeating-linear-gradient(0deg,#dedfd6 0 1px,#fafaf4 1px 3px);backface-visibility:hidden}.edge-top{transform:translateY(-50%) rotateX(90deg) translateZ(165px)}.edge-bottom{transform:translateY(-50%) rotateX(-90deg) translateZ(165px)}.rotation-panel{padding:20px 22px;background:#f5f8f5;border-radius:18px;margin-top:14px}.rotation-panel>label:first-child{display:flex;justify-content:space-between;font-weight:600;font-size:13px}.rotation-panel output{color:var(--green);font-variant-numeric:tabular-nums}.rotation-panel input[type=range]{width:100%;padding:0;background:transparent;border:0;accent-color:var(--green);margin:16px 0 7px;cursor:ew-resize}.rotation-markers{display:flex;justify-content:space-between;font-size:10px;color:#707c73}.rotation-panel .view-toggle{display:flex;align-items:center;gap:10px;font-size:13px;margin-top:18px;cursor:pointer;width:fit-content}.view-toggle input{position:absolute;opacity:0;width:1px;height:1px}.switch-track{width:38px;height:22px;background:#b1bdb5;border-radius:14px;position:relative;transition:background .2s}.switch-track:after{content:'';position:absolute;left:3px;top:3px;width:16px;height:16px;border-radius:50%;background:#fff;transition:transform .2s}.view-toggle input:checked+.switch-track{background:var(--green)}.view-toggle input:checked+.switch-track:after{transform:translateX(16px)}.view-toggle input:focus-visible+.switch-track{outline:3px solid var(--sage);outline-offset:4px}.book-detail-page .hint{margin-top:12px}.detail-contents{max-width:1000px}.detail-block{padding:44px 0;border-top:1px solid var(--line)}.detail-block h2{margin:10px 0 22px}.detail-block .small-label{margin-bottom:0}.author-feature{display:grid;grid-template-columns:230px 1fr;gap:42px;align-items:center;margin-top:28px}.author-feature .author-card>.related,.author-feature .author-card>p{display:none}.author-feature .portrait{height:280px}.author-feature .author-card h3{margin-top:12px}.author-feature>div:last-child p{line-height:1.9;color:#536057}.inline-video{position:relative;width:100%;aspect-ratio:16/9;border-radius:20px;overflow:hidden;background:#101a14}.inline-video iframe{width:100%;height:100%;border:0;display:block}.video-playlist{display:grid;gap:12px;margin-top:20px}.video-playlist>div{display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line);padding-bottom:12px}.video-playlist button{justify-content:flex-start;text-align:left;background:transparent;font-size:14px;font-weight:500}.video-playlist button[aria-pressed=true]{background:#e9f0e8;color:var(--green);font-weight:700}.video-playlist a{font-size:12px;color:#637267;white-space:nowrap}.footer-links a{display:inline-flex;align-items:center;gap:8px}.footer-links img{width:25px;height:25px;object-fit:contain}.footer-links a:first-child img{width:52px}.footer-links a:last-child img{width:30px}
#book-drawer{border:0;padding:0;background:transparent;max-width:none;max-height:none;width:100%;height:100%;position:fixed;inset:0;margin:0;overflow:hidden;color:#111}#book-drawer::backdrop{background:#12221960;backdrop-filter:blur(5px)}.drawer-panel{width:min(520px,100%);height:100%;margin-left:auto;background:#fff;box-shadow:-12px 0 60px #0001;padding:72px 36px 40px;overflow-y:auto;overscroll-behavior:contain;animation:drawer-in .5s cubic-bezier(.2,.8,.2,1)}.drawer-close{position:absolute;top:22px;right:26px;width:42px;height:42px;padding:0;border-radius:50%;background:#f0f4f0}.drawer-panel h2{font-size:32px;margin:12px 0}.drawer-panel p{margin:16px 0}.drawer-panel pre{font:14px/2 Pretendard,sans-serif;white-space:pre-wrap;border-top:1px solid var(--line);padding-top:28px}.drawer-price{font-size:20px;font-weight:700;margin:20px 0 30px}.store-list{display:grid;gap:14px}.store-link{display:grid;grid-template-columns:108px 1fr 20px;align-items:center;gap:16px;background:#f5f7f5;border:1px solid #e8eee8;border-radius:18px;padding:20px 16px;transition:transform .2s,background .2s}.store-link:hover{transform:translateX(4px);background:#edf3ed}.store-logo{height:58px;background:white;border-radius:12px;padding:10px;display:flex;align-items:center;justify-content:center}.store-logo img{max-height:100%;object-fit:contain}.kyobo .store-logo{background:#274835}.store-link strong{font-size:17px}.drawer-panel .muted{font-size:13px;line-height:1.8}@keyframes drawer-in{from{transform:translateX(100%)}to{transform:translateX(0)}}
@media(max-width:760px){.price-action{gap:15px}.price-action strong{font-size:27px}.price-action button{padding:14px 17px;font-size:14px}.author-feature{grid-template-columns:1fr;gap:20px}.author-feature>div:first-child{max-width:240px}.author-feature .portrait{height:290px}.detail-block{padding:32px 0}.video-playlist>div{align-items:flex-start;flex-direction:column;gap:6px}.video-playlist a{margin-left:18px}.drawer-panel{padding:72px 24px 30px}.store-link{grid-template-columns:90px 1fr 16px;gap:12px;padding:18px 12px}.drawer-panel h2{font-size:29px}.book-grid .book-visual{padding:18px}.book-grid .book-visual:hover .tilt{--scale:1}}

/* Feedback 3: deliberate book controls, clear composing action and video zone. */
.book-detail-page .stage,.book-detail-page .stage:active{cursor:default;touch-action:auto}.rotation-panel{padding:22px 24px}.rotation-panel>label:first-child{font-size:14px}.rotation-panel output{background:#e2ece1;color:#1e3b2f;border-radius:6px;padding:2px 9px;font-weight:700}.rotation-track{position:relative;margin:15px 0 0;height:34px}.rotation-panel .rotation-track input[type=range]{appearance:none;-webkit-appearance:none;height:32px;margin:0;padding:0;display:block;cursor:pointer;position:relative;z-index:2;background:transparent;width:100%}.rotation-track input::-webkit-slider-runnable-track{height:4px;border-radius:2px;background:linear-gradient(to right,#1e3b2f var(--progress,0%),#c6d2c8 var(--progress,0%))}.rotation-track input::-moz-range-track{height:4px;border-radius:2px;background:#c6d2c8}.rotation-track input::-moz-range-progress{height:4px;background:#1e3b2f}.rotation-track input::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:22px;height:22px;border-radius:4px;background:#1e3b2f;border:3px solid white;box-shadow:0 0 0 1px #1e3b2f60,0 3px 8px #1e3b2f25;margin-top:-9px}.rotation-track input::-moz-range-thumb{width:16px;height:16px;border-radius:4px;background:#1e3b2f;border:3px solid white;box-shadow:0 0 0 1px #1e3b2f60}.rotation-track input:focus-visible{outline-offset:6px}.rotation-ticks{position:absolute;top:13px;left:11px;right:11px;display:flex;justify-content:space-between;pointer-events:none;z-index:3}.rotation-ticks i{display:block;width:2px;height:10px;background:#7f8c6a;transform:translateY(13px)}.rotation-markers{position:relative;display:block;height:43px;margin:0 0 2px}.rotation-markers button{position:absolute;top:7px;padding:5px 0;border:0;border-radius:5px;color:#657365;font-size:12px;line-height:1.5;background:transparent;font-weight:500;transform:translateX(-50%);white-space:nowrap;min-height:30px}.rotation-markers button:first-child{left:0;transform:none}.rotation-markers button:nth-child(2){left:33.333%}.rotation-markers button:nth-child(3){left:66.666%}.rotation-markers button:last-child{right:0;transform:none}.rotation-markers button:hover{color:#1e3b2f;background:#e6eee5}.rotation-markers button[aria-pressed=true]{color:#1e3b2f;font-weight:800}.rotation-track:has(input:disabled),.rotation-markers:has(button:disabled){opacity:.45}.rotation-panel .view-toggle{margin-top:12px}.compose-fab{position:fixed;right:max(28px,calc((100vw - 1280px)/2 + 32px));bottom:calc(28px + env(safe-area-inset-bottom));display:flex;align-items:center;gap:10px;padding:15px 24px;border-radius:20px;background:#1e3b2f;color:white;font-size:16px;font-weight:700;box-shadow:0 8px 24px #1e3b2f38;z-index:25;transition:transform .2s,box-shadow .2s}.compose-fab span{font-size:28px;font-weight:400;line-height:1}.compose-fab:hover{transform:translateY(-3px);box-shadow:0 12px 28px #1e3b2f4d}.contact-page{padding-bottom:80px}.contact-page .actions a:first-child span{font-size:22px;line-height:1}.detail-block.video-section{background:#1a3027;color:#fff;border:0;border-radius:28px;padding:38px;margin:28px 0 48px}.video-section .small-label{color:#b6c8a4}.video-section h2{color:#fff;margin-bottom:12px}.video-section .video-intro{color:#cad7cd;font-size:15px;margin:0 0 28px;line-height:1.8}.video-section .inline-video{border:1px solid #ffffff22;scroll-margin-top:110px}.video-section .video-playlist>div{border-color:#ffffff20}.video-section .video-playlist button{color:#d7e2d9;max-width:100%;line-height:1.6}.video-section .video-playlist button[aria-pressed=true]{color:white;background:#ffffff18;box-shadow:inset 3px 0 #b6c8a4}.video-section .video-playlist button span{color:#b6c8a4}.video-section .video-playlist a{color:#c3d1c5;text-decoration:underline;text-underline-offset:4px}.video-section .muted{color:#b9cabc;font-size:13px}body:has(dialog[open]){overflow:hidden}
@media(max-width:760px){.rotation-panel{padding:20px}.rotation-markers button{font-size:11px}.detail-block.video-section{padding:24px 18px;border-radius:22px;margin:20px -6px 36px}.video-section h2{font-size:26px}.video-section .video-intro{font-size:14px}.video-section .inline-video{border-radius:12px}.video-section .video-playlist button{padding:12px;font-size:13px}.compose-fab{right:20px;bottom:calc(20px + env(safe-area-inset-bottom));border-radius:18px;padding:13px 20px;font-size:15px}.contact-page{padding-bottom:100px}}

.rotation-ticks{top:11px;z-index:1}.rotation-ticks i{transform:none}

/* Explicit showModal entry is controlled by Web Animations, matching the exit path. */
#book-drawer .drawer-panel{animation:none;will-change:transform;transform:translateX(0)}
#book-drawer::backdrop{backdrop-filter:none;-webkit-backdrop-filter:none;background:#12221966}