@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@400;500;600;700;800&family=Noto+Serif+KR:wght@400;600;700;900&family=Nanum+Pen+Script&family=IBM+Plex+Mono:wght@400;500&display=swap');

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*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:95px}
body{margin:0;background:#d7d2bc;color:var(--ink);font-family:var(--sans);word-break:keep-all;overflow-wrap:break-word}
body::before{content:'';position:fixed;inset:0;pointer-events:none;background:repeating-linear-gradient(95deg,#fff1 0 1px,transparent 1px 7px);z-index:-1}
a{color:inherit}button,input,textarea{font:inherit}button{cursor:pointer;touch-action:manipulation}button:disabled{cursor:wait;opacity:.6}
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main{max-width:1220px;margin:40px auto 55px;background:var(--paper);box-shadow:0 2px 4px #453c2426,7px 8px 0 -3px #e4dcc2,8px 9px 0 -3px #a99c7f,14px 15px 0 -6px #e8dfc5,20px 25px 55px #4b412a2b;position:relative;isolation:isolate}
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.cover-topic .text-link{margin-top:13px;position:relative}.cover-topic .text-link::after{content:'직접 만져보기!';position:absolute;right:-53px;top:40px;font:23px var(--pencil);color:var(--red);transform:rotate(-7deg)}
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.cover-stamp{position:absolute;right:13px;top:-115px;display:grid;place-content:center;width:100px;height:100px;border:2px solid #a65a40;border-radius:50%;outline:1px solid #a65a4080;outline-offset:-7px;font:700 16px/1.7 var(--serif);text-align:center;color:#a65a40;transform:rotate(12deg)}
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.camera-stage canvas{aspect-ratio:1.95;cursor:grab;touch-action:pan-y}.camera-stage canvas.dragging{cursor:grabbing}.stage-corner{position:absolute;left:23px;top:21px;font:9px var(--mono);color:#666f5e;letter-spacing:.06em;pointer-events:none}
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.lab{border:1px solid #aaa68d;background:#f7efd9;position:relative}.lab-top{display:flex;justify-content:space-between;gap:18px;padding:15px 22px;border-bottom:1px solid var(--line);font:600 11px/1.8 var(--sans);letter-spacing:.01em}.lab-top span:last-child{font-size:9px;font-weight:400;color:var(--muted)}
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.lab-footer{display:flex;gap:18px;justify-content:space-between;align-items:center;flex-wrap:wrap;padding:16px 27px;border-top:1px solid var(--line);min-height:67px}.lab-footer>span{font-size:11px;color:var(--ink)}.plain-btn{border:0;background:none;font-size:11px;color:var(--ink);padding:10px 0;text-decoration:underline;text-underline-offset:4px}
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.light-meter{height:3px;background:#d9ccac;margin:13px 0 22px}.light-meter i{display:block;height:100%;background:var(--red);width:25%}.wide-control{display:block;padding:20px 27px 25px}.check{display:flex;align-items:center;gap:6px;font-size:10px}.check input{accent-color:var(--ink);width:17px;height:17px}
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.contact-sheet{margin-top:25px;padding-top:14px;border-top:1px solid var(--ink)}.sheet-heading{display:flex;justify-content:space-between;font:10px var(--mono);letter-spacing:.04em}.contact-sheet>p{font-size:11px;color:var(--muted);padding:13px 0}.contact-sheet #shots{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:18px}.contact-sheet figure{margin:0;background:#faf2dd;padding:7px;box-shadow:1px 2px 3px #776e4933;transform:rotate(-1deg)}.contact-sheet figure:nth-child(even){transform:rotate(1deg)}.contact-sheet img{display:block;width:100%}.contact-sheet figcaption{font:9px/1.8 var(--mono);padding:10px 3px 5px}.contact-sheet figcaption span{display:block;color:var(--red);font-size:10px}
.ending{margin:90px 65px 0;padding:35px 0 0;border-top:3px double var(--ink)}.ending .eyebrow{font-family:var(--sans);letter-spacing:.12em}.ending h2{font:700 35px/1.6 var(--serif);letter-spacing:-.04em;margin:18px 0}.ending>p:not(.eyebrow){font-size:13px;line-height:2}.discovery-questions{padding:8px 0 8px 25px;font-size:12px;line-height:2.2}.discovery-questions li{padding:3px 0 3px 7px}
.observation{margin-top:24px;border:1px solid #a6a087;padding:22px 25px;position:relative;background:#f6eed8}.observation>label{font:29px var(--pencil);color:var(--red)}.observation textarea{display:block;resize:vertical;width:100%;min-height:145px;border:0;border-bottom:1px solid var(--line);border-radius:0;background:repeating-linear-gradient(transparent 0 31px,#aba58d66 31px 32px);line-height:32px;padding:0 4px;margin:12px 0 15px;color:var(--ink);font:22px/32px var(--pencil)}.observation textarea::placeholder{color:#96907b}.note-tools{display:flex;align-items:center;gap:15px;flex-wrap:wrap}.note-tools button{padding:9px 15px;font-size:10px}.note-tools span{font-size:10px;color:var(--muted)}.observation small{display:block;margin-top:13px;font-size:9px;color:var(--muted);line-height:1.8}.ending>.text-link{margin-top:22px}
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.noscript{position:fixed;bottom:0;background:#fff1d2;padding:15px;z-index:100;font-size:12px}

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span{font-size:9px}.sheet-heading{font-size:9px}.contact-sheet>p{font-size:10px;line-height:1.9}.ending{margin:65px 20px 0;padding-top:25px}.ending h2{font-size:28px}.ending>p:not(.eyebrow){font-size:12px}.discovery-questions{font-size:11px;padding-left:20px}.observation{padding:18px 15px}.observation>label{font-size:27px}.observation textarea{font-size:21px}.note-tools{gap:10px}.note-tools span{font-size:9px}.sources{margin:40px 20px 0;padding-bottom:25px}.sources li{overflow-wrap:anywhere}.notebook-footer{margin:0 20px;padding:20px 0 25px;gap:12px;font-size:9px}.notebook-footer small{font-size:7px;text-align:right}
}
@media(max-width:350px){.opening{padding-right:22px;padding-left:29px}.cover-topic h2{font-size:23px}.cover-topic .text-link::after{right:-61px;font-size:18px}.cover-fields{gap:10px}.cover-fields b{font-size:20px}.anatomy,.chapter{padding-left:16px;padding-right:16px}.part-selector{gap:4px}.part-selector button{padding:8px 7px}.part-selector i{display:none}.chapter-intro h2{font-size:26px}.chapter-nav{margin-left:16px;margin-right:16px;padding:15px}.chapter-links{gap:11px}.iris-numbers{padding:8px}.iris-numbers>strong{font-size:32px}.three{grid-template-columns:1fr;gap:3px}.three label{display:block}.sensor-modes button{font-size:8px;padding:9px 6px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}

/* Open the book directly at the working model. */
.opening--interactive{min-height:0;margin-bottom:40px;padding:24px 55px 27px;overflow:hidden}
.opening--interactive .opening-top{padding-bottom:11px;border-bottom-width:1px}
.cover-heading.compact-masthead{display:flex;align-items:center;justify-content:space-between;gap:25px;padding:17px 0 22px;margin:0 0 21px;border-bottom:3px double #7f805b70}
.service-lockup{display:flex;align-items:baseline;gap:13px;min-width:0}
.compact-masthead .pencil-prefix{position:static;font:34px/1.1 var(--pencil);color:var(--red);transform:none;white-space:nowrap}
.compact-masthead .pencil-prefix::after{content:none}
.compact-masthead h1{font:900 64px/1.25 var(--serif);letter-spacing:.04em;margin:0;white-space:nowrap}
.cover-topic-name{font:700 31px/1.4 var(--serif);letter-spacing:.02em;margin:0;padding-left:25px;border-left:1px solid #7f805b70}
.opening--interactive .anatomy{padding:0;position:relative;z-index:1}
.opening--interactive .anatomy-heading{margin-bottom:17px;align-items:center}
.opening--interactive .anatomy-heading h2{font-size:28px}
.opening--interactive .anatomy-heading>p{font-size:11px}
.opening--interactive .camera-stage{background:radial-gradient(ellipse at 50% 42%,#eee6c6,#dfd3ad);border-color:#aaa383}
.opening--interactive .camera-stage canvas{aspect-ratio:2.6}
.opening--interactive .assembly-controls{padding:11px 0}
.opening--interactive .part-selector{padding:14px 0}
.opening--interactive .part-description{min-height:0;padding:3px 0 17px}
.opening--interactive .model-note{margin-top:11px}
.chapter-nav::after{content:none}
@media(max-width:900px){.opening--interactive{padding:20px 35px 24px;min-height:0}.compact-masthead h1{font-size:51px}.compact-masthead .pencil-prefix{font-size:29px}.cover-topic-name{font-size:26px}.opening--interactive .camera-stage canvas{aspect-ratio:2}}
@media(max-width:600px){
 .opening--interactive{padding:17px 21px 21px 29px;margin-bottom:28px;min-height:0}
 .cover-heading.compact-masthead{display:flex;padding:13px 0 17px;margin-bottom:18px;gap:12px}
 .service-lockup{display:flex;flex-direction:column;align-items:flex-start;gap:1px}
 .compact-masthead .pencil-prefix{position:static;font-size:25px;line-height:1.1;transform:none}
 .compact-masthead h1{font-size:clamp(34px,10vw,44px);letter-spacing:.035em;line-height:1.25}
 .cover-topic-name{font-size:23px;padding-left:14px;flex-shrink:0}
 .opening--interactive .anatomy-heading{display:block;margin-bottom:13px}
 .opening--interactive .anatomy-heading h2{font-size:23px;letter-spacing:-.05em}
 .opening--interactive .anatomy-heading>p{font-size:10px;margin-top:8px}
 .opening--interactive .camera-stage canvas{aspect-ratio:1.3}
 .opening--interactive .part-selector{padding:12px 0;gap:4px}
 .opening--interactive .part-selector button{font-size:9px;padding:8px}
 .opening--interactive .part-description{padding-bottom:12px;gap:5px}
 .opening--interactive .model-note{font-size:8px}
}
@media(max-width:350px){.opening--interactive{padding-left:25px;padding-right:17px}.opening--interactive .anatomy-heading h2{font-size:21px}.opening--interactive .part-selector button{padding:7px 6px}.compact-masthead h1{font-size:34px}.cover-topic-name{font-size:21px;padding-left:10px}}
@media(min-width:901px){main{margin-top:24px}.opening--interactive{padding-top:18px}.cover-heading.compact-masthead{padding-top:12px;padding-bottom:15px;margin-bottom:16px}.opening--interactive .camera-stage canvas{aspect-ratio:2.8}}