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:root{color-scheme:dark;--cream:#fff5df;--gold:#efcf8a;--ink:#253c33;--serif:"Yu Mincho","Hiragino Mincho ProN","Noto Serif JP",serif;--sans:"Yu Gothic","Hiragino Kaku Gothic ProN",Meiryo,sans-serif}
*{box-sizing:border-box}html,body{margin:0;width:100%;height:100%;background:#172a26}body{font-family:var(--sans);color:var(--cream);font-size:20px}button,a,input{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{font:inherit;cursor:pointer;color:inherit;border:0;background:none}a{color:inherit}button:disabled{cursor:default;opacity:.42}[hidden]{display:none!important}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #ffdc80;outline-offset:6px}button{transition:background .18s,transform .18s}button:active:not(:disabled){transform:translateY(2px)}
#experience{position:relative;width:100%;height:100svh;min-height:580px;overflow:clip;isolation:isolate}#world,#fallback,.scene-shade,.grain,#curtain{position:absolute;inset:0;width:100%;height:100%}#world{display:block;z-index:-4;touch-action:pan-y}#fallback{z-index:-3;background:linear-gradient(#bfcdae,#f2d4a2 65%,#476e50)}.fallback-mountain{position:absolute;inset:20% -10% 0;background:#45624e;clip-path:polygon(0 65%,18% 33%,28% 50%,48% 0,74% 47%,85% 35%,100% 80%,100% 100%,0 100%)}.scene-shade{z-index:-2;pointer-events:none;background:linear-gradient(180deg,rgba(10,24,23,.48),transparent 32%,transparent 49%,rgba(10,24,23,.62) 72%,#122822f2 100%)}.grain{z-index:-1;pointer-events:none;opacity:.035;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.78' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' opacity='.6' filter='url(%23n)'/%3E%3C/svg%3E")}#curtain{z-index:20;pointer-events:none;background:#172a26;opacity:0;transition:opacity .22s}.scene-changing #curtain{opacity:1}
.masthead{position:absolute;inset:30px 40px auto;display:flex;align-items:center;justify-content:space-between;gap:24px;z-index:5}.brand{display:flex;align-items:center;gap:14px;text-align:left;padding:0;text-shadow:0 2px 16px #142b29}.brand svg{width:44px;height:44px;stroke:var(--cream);stroke-width:1.8;fill:none;flex-shrink:0}.brand small{display:block;font-size:16px;letter-spacing:.04em;margin-bottom:4px}.brand strong{display:block;font-size:23px;letter-spacing:.08em;font-weight:600}.header-actions{display:flex;align-items:center;gap:26px;font-size:18px}.header-actions button{min-height:52px}.header-actions button:hover{color:var(--gold)}.menu-button{padding:10px 20px!important;border:1px solid #fff6dd66;border-radius:4px;background:#213a3199}.menu-button span{margin-right:5px}
.cover{position:absolute;top:20%;left:50%;transform:translateX(-50%);width:min(900px,90%);text-align:center;text-shadow:0 3px 26px #162e28aa}.eyebrow{font-size:20px;line-height:1.6;letter-spacing:.1em;margin:0 0 20px}.cover h1{font:500 clamp(54px,5.5vw,88px)/1.3 var(--serif);letter-spacing:.06em;margin:0}.cover-sub{font-size:24px;line-height:1.8;letter-spacing:.05em;margin:26px 0 0}.chapter-heading{position:absolute;top:135px;left:5.5%;max-width:86%;text-shadow:0 2px 18px #12271bdd}.chapter-heading>p{font-size:18px;letter-spacing:.18em;margin:0 0 12px;color:#ffe5ab}.chapter-heading h2{font:500 clamp(32px,3vw,46px)/1.45 var(--serif);letter-spacing:.045em;margin:0}
.reader{position:absolute;bottom:89px;left:5.5%;right:5.5%;max-width:1500px;margin:auto}.reader-row{display:flex;align-items:center;justify-content:space-between;gap:32px}.narrative{flex:1;min-width:0;text-shadow:0 2px 12px #142820}.narrative p{font:500 clamp(24px,2.05vw,32px)/1.8 var(--serif);letter-spacing:.025em;margin:0}.action-area{display:flex;align-items:stretch;flex-direction:column;gap:12px;max-width:420px;flex-shrink:0}.primary,.consult-button{display:inline-flex;align-items:center;justify-content:center;gap:18px;background:var(--cream);color:var(--ink);padding:16px 26px;border:1px solid #fff9e1;border-radius:5px;text-decoration:none;font-size:22px;font-weight:700;line-height:1.45;min-height:72px;box-shadow:0 8px 28px #061b2526}.primary:hover,.consult-button:hover{background:#ffe8b3;box-shadow:0 8px 36px #f6cc7130}.primary:disabled{opacity:.8}.action-orbit{display:grid;place-items:center;border:1px solid #687d65;border-radius:100%;width:38px;height:38px;font-size:26px;font-weight:400;flex-shrink:0;position:relative}.action-orbit:before{content:"";position:absolute;inset:-5px;border:1px solid #75866755;border-radius:50%;animation:invite 2.4s ease-out infinite}.step-status{font-size:18px;line-height:1.5;margin:0;color:#fbe5b5;text-align:center}.text-button{font-size:18px;line-height:1.55;min-height:44px;text-decoration:underline;text-decoration-color:#fff4d777;text-underline-offset:6px;padding:4px 0}.text-button:hover{color:var(--gold)}.story-footer{position:absolute;bottom:max(18px,env(safe-area-inset-bottom));left:5.5%;right:5.5%;display:flex;align-items:center;justify-content:space-between;gap:16px;font-size:18px;color:#fff4dcda}.story-footer button{min-height:44px;padding:7px 0}.story-footer button:hover{color:var(--gold)}#page-counter{letter-spacing:.12em;font-size:18px}#experience[data-role="cover"] .narrative{display:none}#experience[data-role="cover"] .reader-row{justify-content:center}#experience[data-role="cover"] .primary{padding:18px 40px;font-size:24px;min-height:80px}#experience[data-role="cover"] .reader{bottom:105px}#experience[data-role="ending"] .reader{display:none}
.teacher-panel{position:absolute;top:32%;left:5.5%;display:flex;align-items:center;gap:28px;padding:26px;background:#eee4cbeF;color:#263b32;border-radius:6px;box-shadow:0 20px 60px #08141030;max-width:550px}.teacher-panel>img{width:170px;height:205px;object-fit:cover;object-position:top;border-radius:4px}.teacher-panel p{font:500 27px/1.7 var(--serif);margin:0 0 12px}.teacher-panel h3{font-size:24px;margin:0 0 10px}.teacher-panel h3 span{font-size:18px;margin-left:10px}.teacher-panel .text-button{color:#334f40;font-size:18px}.ending{position:absolute;top:17%;left:7%;width:min(780px,80%);max-height:calc(83svh - 90px);overflow:auto;scrollbar-width:thin;padding:0 14px 20px 0;text-shadow:0 2px 22px #213a2d}.ending h2{font:500 clamp(24px,2.1vw,34px)/1.85 var(--serif);margin:0}.ending h2 em{display:block;font-style:normal;font-size:clamp(36px,3.4vw,54px);line-height:1.6;color:#ffe5a3;margin:20px 0;letter-spacing:.03em}.ending-note{font-size:22px;line-height:1.8;margin:20px 0 26px}.ending .consult-button{min-width:280px;text-shadow:none;font-size:24px}.ending>.text-button{display:block;margin-top:16px}#experience[data-role="ending"] .scene-shade{background:linear-gradient(90deg,#102c2ae0,rgba(18,42,30,.7) 45%,rgba(20,48,35,.05)),linear-gradient(0deg,#142a28,transparent 30%)}
.play-zone{margin:0 0 20px}.moon-controller{display:flex;align-items:center;gap:25px;max-width:700px;padding:20px 26px;border:1px solid #c6deea88;background:#122c42ee;border-radius:5px;box-shadow:0 10px 30px #0a1e3e22}.moon-observation{display:flex;align-items:center;gap:18px;flex-shrink:0}.moon-disc{width:76px;height:76px;filter:drop-shadow(0 0 14px #c3e0ff33)}.moon-disc svg{width:100%;height:100%}.moon-observation small{display:block;font-size:16px;line-height:1.5;color:#cad8e5}.moon-observation strong{display:block;font-size:22px;margin-top:4px}.moon-range{flex:1;min-width:140px}.moon-range label{display:block;font-size:20px;margin-bottom:5px}.moon-range input{width:100%;height:40px;accent-color:#ffdb91;cursor:ew-resize;margin:0}.moon-labels{display:flex;justify-content:space-between;font-size:16px;color:#d5dfeb}.moon-note{font-size:16px;color:#dee7ef;margin:10px 0 0}#experience[data-interaction="moon"] .reader{bottom:78px}#experience[data-interaction="moon"] .scene-shade{background:linear-gradient(180deg,#07172c88,transparent 35%,#061b3055 48%,#071f32ef 78%,#071f32)}
.paper-dialog{color-scheme:light;color:#243c32;background:#f6f0df;border:1px solid #d0c7ae;box-shadow:0 30px 100px #051a2377;border-radius:7px;width:min(850px,calc(100% - 40px));max-height:88svh;padding:50px 56px;overflow:auto;font-size:22px;line-height:1.85}.paper-dialog::backdrop{background:#102b28bc;backdrop-filter:blur(7px)}.paper-dialog h2{font:500 38px/1.55 var(--serif);margin:0 0 28px}.paper-dialog p{margin:18px 0}.paper-dialog .eyebrow{font-size:18px;color:#5b6b50;margin:0 44px 16px 0}.dialog-close{position:sticky;display:block;float:right;top:0;margin:-22px -25px 0 10px;width:50px;height:50px;line-height:1;background:#e5ddc9;border-radius:50%;font-size:34px;z-index:2}.paper-dialog .consult-button{background:#254c3d;color:#fff6df;border-color:#254c3d;min-width:250px;font-size:24px}.paper-dialog .consult-button:hover{background:#39694f}.paper-dialog a:focus-visible,.paper-dialog button:focus-visible{outline-color:#25734d}.parent-teacher{display:flex;align-items:center;gap:26px;padding:25px 0;margin:25px 0;border-top:1px solid #a8b19b;border-bottom:1px solid #a8b19b}.parent-teacher img{width:120px;height:145px;object-fit:cover;border-radius:4px;flex-shrink:0}.parent-teacher small{font-size:16px}.parent-teacher h3{margin:4px 0;font-size:26px}.parent-teacher h3 span{font-size:20px}.parent-teacher p{font-size:20px;margin:8px 0}.parent-note,.external-note{font-size:18px}.external-note{display:block;margin-top:16px}.contents-dialog ol{list-style:none;padding:0;margin:0}.contents-dialog li{border-top:1px solid #c5c7b6}.contents-dialog li button{display:flex;align-items:center;gap:24px;text-align:left;width:100%;padding:18px 0}.contents-dialog li button:hover{background:#e7e4ce}.contents-dialog li span{font-size:18px;color:#667459;min-width:44px}.contents-dialog li b{font-size:24px;font-weight:500;line-height:1.5}.contents-dialog li small{margin-left:auto;font-size:22px}.contents-dialog li [aria-current="step"] b{color:#1d724a;text-decoration:underline;text-underline-offset:7px}.contents-foot{display:flex;gap:18px;flex-wrap:wrap;margin-top:25px;font-size:18px}.contents-foot button{text-decoration:underline;text-underline-offset:6px}.reading-settings{display:flex;gap:16px;margin-top:26px}.reading-settings button{border:1px solid #93a087;font-size:18px;padding:9px 16px;border-radius:4px}.reading-settings [aria-pressed="true"]{background:#264c3d;color:#fff6df}.reading-dialog article{padding:24px 0;border-bottom:1px solid #b7c3aa}.reading-dialog h3{font:500 28px/1.6 var(--serif)}.reading-dialog aside{font-size:20px;padding:22px;background:#e7e7d3}.reading-dialog aside strong{display:block}.reading-dialog .consult-button{margin-top:30px}.discovery-question{padding:22px;border-left:3px solid #889a65;background:#e9e8d4;font-family:var(--serif);font-size:26px}.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;z-index:100;left:20px;top:-100px;padding:16px;background:#fff5df;color:#213b30}.skip-link:focus{top:20px}.noscript{position:fixed;inset:0;background:#163b31;padding:8%;z-index:100}
@keyframes invite{0%{transform:scale(.95);opacity:.8}80%,100%{transform:scale(1.4);opacity:0}}.reduce-motion *, .reduce-motion *:before{animation:none!important;transition:none!important}
@media(min-width:1800px){.reader{bottom:110px}.narrative p{font-size:34px}.primary{font-size:25px;padding:20px 32px}.chapter-heading{top:150px}}
@media(max-width:1100px){.masthead{inset:24px 28px auto}.header-actions{gap:18px}.cover{top:21%}.cover h1{font-size:68px}.cover-sub{font-size:23px}.chapter-heading{top:125px}.reader-row{gap:22px;align-items:flex-start;flex-direction:column}.reader{bottom:80px}.action-area{width:auto;max-width:100%;flex-direction:row;align-items:center;flex-wrap:wrap;gap:10px 24px}.primary{font-size:21px;padding:14px 22px;min-height:66px}.narrative p{font-size:27px}.step-status{order:3;font-size:18px}#experience[data-role="cover"] .reader-row{align-items:center}.teacher-panel{top:29%;padding:20px;gap:20px}.teacher-panel>img{height:160px;width:135px}.teacher-panel p{font-size:25px}.teacher-panel h3{font-size:22px}.ending{top:17%;width:80%}.ending h2{font-size:27px}.ending h2 em{font-size:40px}.moon-controller{padding:14px 20px}.moon-disc{width:60px;height:60px}.moon-range input{height:32px}.moon-note{margin-top:6px}.play-zone{margin-bottom:14px}#experience[data-interaction="moon"] .narrative p{font-size:25px}}
@media(max-width:700px){
#experience{min-height:640px}.masthead{inset:18px 20px auto;gap:12px}.brand{gap:9px}.brand svg{width:32px;height:32px}.brand small{display:none}.brand strong{font-size:18px;letter-spacing:.025em}.header-actions{gap:0;font-size:17px}#parents-open{display:none}.menu-button{padding:8px 12px!important;min-height:46px!important}.menu-button span{display:none}.cover{top:21%;width:90%}.cover .eyebrow{font-size:18px;letter-spacing:.02em;margin-bottom:20px}.cover h1{font-size:clamp(40px,9.5vw,64px);line-height:1.45;letter-spacing:.025em}.cover-sub{font-size:20px;line-height:1.8;margin-top:22px;letter-spacing:0}.cover-sub br{display:none}.chapter-heading{top:96px;left:6%;max-width:88%}.chapter-heading>p{font-size:16px;margin-bottom:8px;letter-spacing:.08em}.chapter-heading h2{font-size:28px;line-height:1.5;letter-spacing:.01em}.reader{left:6%;right:6%;bottom:78px}.reader-row{gap:20px}.narrative p{font-size:22px;line-height:1.8;letter-spacing:0}.action-area{width:100%;gap:10px;flex-direction:column;align-items:stretch}.primary{font-size:20px;padding:14px 16px;min-height:64px;gap:14px}.action-orbit{width:32px;height:32px;font-size:23px;flex-shrink:0}.step-status{order:0;font-size:16px;text-align:left;margin-top:-8px}.text-button{font-size:17px;min-height:42px}.story-footer{left:6%;right:6%;bottom:max(14px,env(safe-area-inset-bottom));font-size:17px;gap:10px}#page-counter{font-size:16px}.story-footer button{min-height:44px}#experience[data-role="cover"] .reader{bottom:106px}#experience[data-role="cover"] .primary{font-size:22px;padding:18px 22px;min-height:74px}#experience[data-role="cover"] .action-area{width:auto;min-width:270px}.scene-shade{background:linear-gradient(180deg,#10261e88,transparent 39%,#132f2244 49%,#102b24e8 70%,#102b24 100%)}.teacher-panel{top:max(210px,30%);left:6%;right:6%;max-width:100%;gap:16px;padding:18px}.teacher-panel>img{width:100px;height:137px}.teacher-panel p{font-size:22px;line-height:1.6;margin-bottom:6px}.teacher-panel h3{font-size:22px;margin-bottom:0}.teacher-panel h3 span{font-size:16px;margin-left:6px}.teacher-panel .text-button{font-size:16px}.ending{top:106px;left:6%;width:88%;max-height:calc(100svh - 188px);padding-right:8px}.ending .eyebrow{font-size:18px;line-height:1.65;letter-spacing:0;margin-bottom:20px}.ending h2{font-size:22px;line-height:1.85}.ending h2 em{font-size:34px;line-height:1.65;margin:20px 0}.ending-note{font-size:20px;margin:18px 0 24px}.ending .consult-button{min-width:0;width:100%;font-size:24px;padding:16px 20px}.ending>.text-button{font-size:18px;margin-top:12px}.moon-controller{padding:14px;gap:15px;width:100%}.moon-observation{display:block}.moon-disc{width:58px;height:58px;margin:0 auto 4px}.moon-observation small{font-size:16px;max-width:80px;line-height:1.25}.moon-observation strong{font-size:18px}.moon-range{min-width:130px}.moon-range label{font-size:18px;line-height:1.5;margin-bottom:3px}.moon-range input{height:40px}.moon-labels{font-size:16px}.moon-note{display:none}.play-zone{margin-bottom:18px}#experience[data-interaction="moon"] .narrative p{font-size:21px;line-height:1.7}#experience[data-interaction="moon"] .reader-row{gap:16px}#experience[data-interaction="moon"] .reader{bottom:74px}#experience[data-interaction="moon"] .chapter-heading h2{font-size:27px}.paper-dialog{width:calc(100% - 24px);max-height:92svh;padding:30px 24px;font-size:20px;line-height:1.8}.paper-dialog h2{font-size:29px;margin-bottom:20px}.paper-dialog .eyebrow{font-size:17px}.dialog-close{margin:-15px -12px 0 8px;width:44px;height:44px;font-size:30px}.parent-teacher{gap:18px;align-items:flex-start;flex-wrap:wrap}.parent-teacher img{width:100px;height:125px}.parent-teacher h3{font-size:24px}.parent-teacher p{font-size:20px}.parent-note,.external-note{font-size:17px}.contents-dialog li button{gap:14px;padding:16px 0}.contents-dialog li b{font-size:21px}.contents-dialog li span{font-size:16px;min-width:32px}.contents-dialog li small{display:none}.reading-settings{flex-wrap:wrap;gap:10px}.reading-settings button{font-size:17px}.contents-foot{font-size:18px;gap:12px}.discovery-question{font-size:23px;padding:16px}.reading-dialog h3{font-size:25px}.reading-dialog aside{font-size:20px;padding:18px}}
@media(max-width:380px){.masthead{left:16px;right:16px}.brand strong{font-size:17px}.brand svg{width:27px}.menu-button{padding:7px 10px!important}.cover{top:19%}.cover .eyebrow{font-size:17px}.cover h1{font-size:39px}.cover-sub{font-size:20px;margin-top:18px}.chapter-heading h2{font-size:26px}.narrative p{font-size:21px}.primary{font-size:20px;gap:10px;padding:12px}.teacher-panel{gap:12px;padding:14px;top:max(210px,30%)}.teacher-panel>img{width:80px;height:125px}.teacher-panel p{font-size:20px}.teacher-panel h3{font-size:20px}.teacher-panel .text-button{font-size:16px}.ending h2 em{font-size:31px}.moon-controller{gap:10px;padding:12px}.moon-range label{font-size:17px}.moon-observation small{font-size:16px}#experience[data-interaction="moon"] .narrative p{font-size:20px}}
@media(max-height:720px) and (min-width:701px){#experience{min-height:580px}.masthead{top:18px}.chapter-heading{top:98px}.chapter-heading h2{font-size:32px}.chapter-heading>p{margin-bottom:4px}.cover{top:19%}.cover h1{font-size:58px}.cover .eyebrow{margin-bottom:10px}.cover-sub{font-size:22px;margin-top:12px}.reader{bottom:74px}.reader-row{flex-direction:row;align-items:center}.narrative p{font-size:24px}.action-area{flex-direction:column;max-width:340px;gap:8px}.primary{font-size:20px;padding:12px 18px}.teacher-panel{top:31%;padding:16px}.teacher-panel img{height:135px;width:110px}.teacher-panel p{font-size:24px}.ending{top:100px;max-height:calc(100svh - 180px)}.ending h2{font-size:24px}.ending h2 em{font-size:36px;margin:12px 0}.ending-note{font-size:20px;margin:12px 0 18px}.play-zone{margin-bottom:12px}.moon-controller{padding:10px 18px}.moon-note{display:none}.moon-disc{width:54px;height:54px}#experience[data-role="cover"] .reader{bottom:80px}}
@media(max-height:720px) and (max-width:700px){.cover{top:17%}.cover .eyebrow{margin-bottom:14px}.cover h1{font-size:42px}.cover-sub{margin-top:15px}.chapter-heading{top:86px}.chapter-heading h2{font-size:25px}.reader-row{gap:14px}.reader{bottom:70px}.narrative p{line-height:1.65}.teacher-panel{top:max(204px,29%);padding:14px}.teacher-panel img{height:117px;width:85px}.teacher-panel p{font-size:20px}.teacher-panel h3{font-size:20px}.teacher-panel .text-button{min-height:32px}.play-zone{margin-bottom:12px}.moon-controller{padding:10px 12px}.moon-disc{width:44px;height:44px}.moon-observation{display:block}.moon-observation small{font-size:16px}.moon-observation strong{font-size:17px}.moon-range input{height:32px}.moon-range label{font-size:18px}.moon-labels{font-size:16px}#experience[data-interaction="moon"] .reader-row{gap:12px}#experience[data-interaction="moon"] .reader{bottom:66px}}

.chapter-heading h2,.cover h1,.ending h2 em{text-wrap:balance}.narrative p{text-wrap:pretty}

#experience[data-moon-playing="true"] .action-area{margin-left:auto}#experience[data-moon-playing="true"] .play-zone{margin-bottom:22px}

@media(max-width:700px){.teacher-panel p{display:none}.teacher-panel h3{margin-bottom:10px}}

@media(max-width:700px){
#experience[data-role="ending"]{height:auto;min-height:100svh}
#experience[data-role="ending"] #world,#experience[data-role="ending"] #fallback,#experience[data-role="ending"] .scene-shade{position:fixed;height:100svh}
#experience[data-role="ending"]:after{content:"";position:fixed;z-index:2;bottom:0;left:0;right:0;height:180px;pointer-events:none;background:linear-gradient(transparent,#153a30 26%)}
.ending{position:relative;top:auto;left:auto;margin:0 6%;width:88%;padding:110px 0 205px;max-height:none;overflow:visible}
.ending .consult-button{position:fixed;left:6%;right:6%;bottom:24px;width:auto;z-index:4;min-height:72px}
#experience[data-role="ending"] .story-footer{position:fixed;bottom:104px;z-index:4}
.ending>.text-button{margin-top:20px}
}

@media(max-width:380px){.cover h1{font-size:38px;letter-spacing:.015em}.cover-sub{line-height:1.7;margin-top:14px}}