@import url('https://fonts.googleapis.com/css2?family=Yomogi&display=swap');
:root{--paper:#f4ebd8;--sheet:#fff8e8;--ink:#292b2b;--navy:#172d4d;--indigo:#304c70;--sand:#c9c1af;--yellow:#e5c46d;--orange:#da8135;--blue:#42799c;--muted:#5e615e;--line:#8b8a7e;--hand:'Yomogi','UD Digi Kyokasho N-R','Yu Mincho',serif;--body:'BIZ UDPGothic','Yu Gothic',Meiryo,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;color:var(--ink);background:radial-gradient(ellipse at 2% 20%,#e5d0a826,transparent 48%),radial-gradient(ellipse at 98% 4%,#b0bec222,transparent 42%),var(--paper);font:16px/1.9 var(--body);-webkit-font-smoothing:antialiased}body:before{content:'';position:fixed;inset:0;pointer-events:none;opacity:.1;z-index:10;background-image:url('paper-grain.svg');background-size:240px}a{color:inherit;text-underline-offset:.22em}img{max-width:100%;display:block}button,input{font:inherit}button,a,input,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--orange);outline-offset:5px}button:disabled{cursor:default}button[hidden],a[hidden],article[hidden],li[hidden]{display:none!important}.wrap{width:min(1160px,calc(100% - 64px));margin-inline:auto}.skip{position:fixed;left:16px;top:-100px;background:var(--sheet);padding:10px;z-index:100}.skip:focus{top:12px}.site-header{position:sticky;top:0;z-index:20;background:#f4ebd8f5;border-bottom:1px solid #292b2b24;backdrop-filter:blur(10px)}.header-inner{min-height:86px;display:flex;align-items:center;justify-content:space-between;gap:26px}.brand{display:flex;align-items:center;gap:13px;text-decoration:none}.brand-mark{width:43px;height:45px;flex:none}.brand-text{font:700 21px/1.5 var(--hand);letter-spacing:.04em}.brand-sub{display:block;font:11px/1.7 var(--body);letter-spacing:.14em;color:var(--muted)}.main-nav{display:flex;gap:28px;align-items:center}.main-nav a{font-size:14px;text-decoration:none;white-space:nowrap}.main-nav a:hover{text-decoration:underline}.hero{padding:66px 0 48px;display:grid;grid-template-columns:1.05fr 1fr;gap:50px;align-items:center}.eyebrow{color:var(--indigo);font-size:13px;font-weight:700;letter-spacing:.13em}.hand{font-family:var(--hand)}h1,h2,h3,p{margin-top:0}h1{font:700 clamp(34px,4.3vw,57px)/1.55 var(--hand);letter-spacing:.055em;margin:17px 0 21px}h2{font:700 clamp(26px,3vw,36px)/1.5 var(--hand);letter-spacing:.045em;margin-bottom:13px}h3{font:700 22px/1.6 var(--hand);margin-bottom:8px}.hero p{max-width:29em;color:#474d4c;font-size:16px}.hero-actions{display:flex;gap:16px;flex-wrap:wrap;margin-top:29px}.button{display:inline-flex;align-items:center;justify-content:center;gap:15px;text-decoration:none;border:1.7px solid var(--ink);padding:12px 23px;border-radius:17% 5% 12% 5%/7% 12% 7% 14%;background:var(--sheet);font-size:14px;font-weight:700;transition:transform .15s,background .15s}.button:hover{transform:translateY(-2px);background:#fffdf5}.button-primary{background:var(--navy);color:var(--sheet);border-color:var(--navy)}.button-primary:hover{background:var(--indigo)}.hero-art{position:relative;margin:4px 7px 20px 0;padding:16px;background:var(--sheet);box-shadow:9px 12px 0 #172d4d0c;border:2px solid var(--ink);border-radius:4% 2% 3% 2%/2% 4% 2% 4%;transform:rotate(1.7deg)}.hero-art img{width:100%;height:330px;object-fit:cover;object-position:center 6%;border-radius:3px}.hero-art figcaption{font:700 17px/1.7 var(--hand);padding:13px 2px 0;text-align:center}.hero-art:before{content:'✦';position:absolute;top:-39px;right:9px;color:var(--orange);font-size:49px;transform:rotate(-13deg)}.hero-art:after{content:'☾';position:absolute;bottom:-31px;left:-34px;color:var(--indigo);font:60px var(--hand)}.small-note{font-size:12px;color:var(--muted)}.section{padding:60px 0}.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:26px}.section-head p{margin:0;color:var(--muted);font-size:14px}.section-head a{white-space:nowrap;font-size:14px}.section-kicker{font-size:12px;letter-spacing:.14em;color:var(--indigo);display:block;margin-bottom:8px}.featured{border-top:1px solid #292b2b33}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}.comic-card{min-width:0;display:block;text-decoration:none;position:relative}.comic-thumb{padding:7px;background:var(--sheet);border:1.5px solid #292b2b8c;border-radius:3% 2% 2% 4%/2% 4% 3% 2%;box-shadow:3px 4px 0 #292b2b0c;transition:transform .2s}.comic-card:hover .comic-thumb{transform:rotate(-1deg) translateY(-3px)}.comic-thumb img{width:100%;aspect-ratio:1.32;object-fit:cover;object-position:50% 7%}.comic-card h3{margin-top:14px;font-size:23px}.comic-card p{font-size:13px;color:var(--muted);margin:5px 0}.tag{display:inline-block;font:11px/1.65 var(--body);padding:3px 9px;background:#d9e4e75e;border-radius:2px;color:var(--navy);letter-spacing:.04em}.tag[data-env=moon]{background:#e5c46d45}.tag[data-env=cabin]{background:#98a8ae36}.tag[data-env=outside]{background:#304c7021}.environment-section{padding:40px 0 54px}.environment-panel{background:#fff8e880;border:1.5px solid #292b2b66;border-radius:1% 2% 1% 1%/3% 2% 3% 2%;padding:28px 32px}.environment-panel h2{font-size:26px}.environment-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;margin-top:23px}.environment-cell{display:grid;grid-template-columns:52px 1fr;gap:14px}.environment-cell+div{border-left:1px dashed #292b2b52;padding-left:28px}.environment-cell svg{width:50px;height:50px}.environment-cell h3{font-size:19px;margin:0 0 4px}.environment-cell p{font-size:13px;color:var(--muted);margin:0}.night-section{background:radial-gradient(ellipse at 18% 8%,#54739055,transparent 50%),radial-gradient(ellipse at 89% 91%,#37658140,transparent 44%),var(--navy);color:var(--sheet);padding:68px 0 70px;position:relative}.night-section:before{content:'✦   ·       ✧        ·    ✦';position:absolute;top:22px;left:8%;right:8%;text-align:center;letter-spacing:30px;color:var(--yellow);font-size:18px;opacity:.75;pointer-events:none}.night-section .section-kicker,.night-section .section-head p{color:#e3decf}.video-feature{display:grid;grid-template-columns:1.1fr 1fr;gap:38px;align-items:center;margin-top:30px}.video-feature>div>p{font-size:14px;color:#e4e2dc}.video-feature h3{font-size:29px}.video-feature .tag{color:var(--sheet);background:#fff8e81c}.video-frame{background:#f4ebd8;border:3px solid #f0deae;border-radius:3% 1% 2% 1%;overflow:hidden;aspect-ratio:16/9;position:relative;color:var(--ink)}.video-placeholder{display:flex;width:100%;height:100%;flex-direction:column;align-items:center;justify-content:center;background:radial-gradient(ellipse at center,#9ec8d44a,transparent 65%),#e5edf0;position:relative}.video-placeholder svg{width:46%;height:55%;overflow:visible}.video-placeholder .play-video{position:absolute;bottom:18px;border:1.5px solid var(--ink);padding:9px 18px;font-size:13px;background:var(--sheet);border-radius:30px}.video-placeholder .play-video:hover{background:#fff}.video-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.video-caption{font-size:12px!important;margin:11px 0 0;color:#e3decf!important}.video-caption a{color:inherit}.night-section .button{border-color:#f4ebd8;color:#f4ebd8;background:transparent;margin-top:8px}.night-section .button:hover{background:#f4ebd815}.physics-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:30px}.physics-card{background:var(--sheet);border:1.4px solid #292b2b8c;border-radius:2% 3% 1% 2%/3% 2% 4% 2%;padding:22px 23px;text-decoration:none;box-shadow:3px 4px 0 #172d4d0a}.physics-card:hover{background:#fffbf1}.physics-card h3{font-size:21px;margin:10px 0 9px}.physics-card p{font-size:13px;color:var(--muted);margin-bottom:12px}.physics-card .read-more{font-size:12px;color:var(--indigo)}.filter-bar{display:flex;gap:10px;flex-wrap:wrap;margin:24px 0 26px}.filter-button{font-size:13px;line-height:1.7;border:1px solid #292b2b70;background:#fff8e885;color:var(--ink);padding:7px 15px;border-radius:18px}.filter-button[aria-pressed=true]{background:var(--navy);border-color:var(--navy);color:var(--sheet)}.search-line{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-bottom:25px}.search-line label{font-size:13px;color:var(--muted)}.search-line input{font-size:14px;min-width:230px;padding:9px 12px;border:1px solid #292b2b66;border-radius:5px;background:#fff8e895;color:var(--ink)}.comic-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:32px 23px}.comic-grid .comic-card h3{font-size:21px}.comic-grid .comic-thumb img{aspect-ratio:1.1}.no-results{padding:30px;background:var(--sheet);border:1px dashed var(--line)}.about{margin:25px 0 60px;padding:32px 38px;background:#e8ddc684;border-radius:2% 1% 3% 1%;display:grid;grid-template-columns:1fr 1.3fr;gap:45px}.about h2{font-size:27px}.about p{font-size:14px;margin-bottom:14px}.site-footer{border-top:1px solid #292b2b32;padding:29px 0;color:var(--muted);font-size:12px}.footer-inner{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap}.footer-inner p{margin:0}.footer-inner a{margin-left:17px}.breadcrumb{font-size:12px;color:var(--muted);margin:28px 0 25px}.breadcrumb a{text-decoration:none}.article-heading{max-width:920px;padding-bottom:33px}.article-heading h1{font-size:clamp(30px,4vw,46px);margin-top:12px;margin-bottom:12px}.article-heading .lead{font-size:17px;color:#4d5555;margin:10px 0 0}.comic-reading{display:grid;grid-template-columns:minmax(0,650px) minmax(260px,1fr);gap:42px;align-items:start}.comic-original{background:var(--sheet);padding:9px;border:1px solid #292b2b70;border-radius:2px;box-shadow:6px 7px 0 #292b2b08}.comic-original img{height:auto;width:100%}.comic-original>a{display:block;cursor:zoom-in}.image-caption{font-size:12px;color:var(--muted);padding-top:9px}.reading-note{position:sticky;top:115px;background:#fff8e8ae;border-top:2px solid var(--indigo);padding:25px 25px 18px}.reading-note h2{font-size:25px}.reading-note p{font-size:14px}.reading-note .button{font-size:12px;padding:9px 14px}.article-copy{max-width:820px;margin:55px auto 0}.article-copy h2{font-size:28px;margin-top:35px}.article-copy p{font-size:16px;line-height:2}.science-note{border-left:3px solid var(--blue);padding:16px 22px;background:#d9e4e732;font-size:14px;margin:24px 0}.science-note strong{display:block;margin-bottom:4px}details{border-top:1px dashed #292b2b70;border-bottom:1px dashed #292b2b70;padding:16px 0;margin:26px 0}summary{cursor:pointer;font-size:14px;font-weight:700}details p,details li{font-size:14px}details p:last-child{margin-bottom:0}.source-list{font-size:13px;line-height:1.9;padding-left:22px}.source-list li{padding:4px 0}.transcript p{font-size:14px}.related-links{display:flex;flex-wrap:wrap;gap:11px}.related-links a{font-size:13px;padding:6px 12px;background:#d9e4e759;border-radius:5px}.article-nav{display:flex;justify-content:space-between;gap:24px;padding:25px 0;margin:35px 0 48px;border-top:1px solid #292b2b3b;font-size:14px}.article-nav a{max-width:45%}.article-video{max-width:820px;margin:0 auto}.article-video .video-caption{color:var(--muted)!important}.physics-illustration{max-width:760px;aspect-ratio:2.7;background:#e3e9e45c;border:1px dashed #292b2b56;border-radius:15px;margin:0 auto 32px;display:flex;align-items:center;justify-content:center;gap:40px;padding:25px}.physics-illustration svg{width:170px;height:150px}.physics-illustration p{font:700 21px/1.9 var(--hand);max-width:360px;margin:0}.notice-inline{font-size:12px;color:var(--muted)}.modal{position:fixed;inset:0;z-index:60;background:#172d4dd9;padding:28px;display:flex;align-items:center;justify-content:center}.modal[hidden]{display:none}.modal-body{max-height:95vh;overflow:auto;max-width:850px;background:var(--paper);padding:16px}.modal-body img{width:100%;height:auto}.modal-close{position:fixed;top:17px;right:22px;font-size:15px;padding:9px 18px;border:1px solid var(--ink);background:var(--sheet);border-radius:25px;z-index:61}
@media(min-width:1300px){.hero-art img{height:360px}}
@media(max-width:1000px){.hero{gap:30px}.hero-art img{height:300px}.main-nav{gap:17px}.comic-grid{grid-template-columns:repeat(3,1fr)}.environment-grid{gap:20px}.environment-cell{grid-template-columns:1fr;gap:7px}.environment-cell+div{padding-left:20px}.comic-reading{grid-template-columns:minmax(0,1.3fr) 1fr;gap:27px}.reading-note{padding:20px}.physics-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:700px){html{scroll-padding-top:118px}.wrap{width:calc(100% - 36px)}.header-inner{padding:10px 0;min-height:94px;gap:7px;flex-direction:column;align-items:flex-start}.brand-text{font-size:19px}.brand-mark{width:32px;height:35px}.brand-sub{display:none}.main-nav{gap:25px;padding-left:2px}.main-nav a{font-size:12px}.hero{padding-top:31px;grid-template-columns:1fr;gap:18px}.hero h1{font-size:36px;line-height:1.5;letter-spacing:.025em}.hero p{font-size:14px;max-width:none}.hero-actions{margin-top:22px}.button{padding:10px 16px}.hero-art{margin:14px 8px 18px 15px;padding:10px;max-width:460px;justify-self:center}.hero-art img{height:260px}.hero-art figcaption{font-size:15px}.hero-art:before{font-size:35px;top:-25px}.hero-art:after{font-size:44px;left:-23px}.section{padding:38px 0}.section-head{align-items:start;gap:12px;flex-direction:column;margin-bottom:20px}.section-head h2{font-size:29px}.feature-grid{gap:24px;grid-template-columns:1fr}.feature-grid .comic-card{display:grid;grid-template-columns:44% 1fr;gap:17px;align-items:center}.feature-grid .comic-card h3{font-size:23px;margin-top:6px}.feature-grid .comic-card p{font-size:12px}.environment-section{padding:12px 0 38px}.environment-panel{padding:22px 21px}.environment-grid{grid-template-columns:1fr;gap:20px}.environment-cell{grid-template-columns:46px 1fr;gap:13px}.environment-cell+div{padding-left:0;border-left:0;padding-top:18px;border-top:1px dashed #292b2b52}.environment-cell svg{width:43px;height:43px}.night-section{padding:51px 0 45px}.night-section:before{letter-spacing:10px;font-size:13px;top:15px}.video-feature{grid-template-columns:1fr;gap:22px}.video-feature h3{font-size:25px}.video-placeholder .play-video{bottom:10px;font-size:12px;padding:7px 14px}.physics-grid{grid-template-columns:1fr;gap:16px}.physics-card{padding:18px 21px}.comic-grid{grid-template-columns:repeat(2,1fr);gap:25px 16px}.comic-grid .comic-card h3{font-size:19px;margin-top:10px}.comic-grid .comic-card p{font-size:12px}.search-line{gap:12px}.search-line input{min-width:0;width:100%}.search-line label{width:100%}.filter-bar{gap:8px}.filter-button{font-size:12px;padding:6px 11px}.about{grid-template-columns:1fr;gap:12px;padding:25px 23px;margin-bottom:35px}.about h2{font-size:27px}.footer-inner{gap:12px}.footer-inner a{margin-left:0;margin-right:18px}.breadcrumb{margin-top:20px}.article-heading{padding-bottom:23px}.article-heading .lead{font-size:15px}.comic-reading{grid-template-columns:1fr;gap:25px}.comic-original{padding:5px}.reading-note{position:static;padding:22px}.article-copy{margin-top:30px}.article-copy p{font-size:15px}.article-copy h2{font-size:25px}.science-note{padding:13px 16px}.article-nav{font-size:12px}.physics-illustration{gap:13px;padding:18px 13px;aspect-ratio:auto}.physics-illustration svg{width:105px;height:120px;flex:none}.physics-illustration p{font-size:17px;line-height:1.7}.modal{padding:10px}.modal-close{right:13px}.modal-body{padding:6px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
.ad-slot{margin:60px 0 45px;border-top:1px solid #292b2b26;padding-top:15px;text-align:center}.ad-slot[hidden]{display:none}.ad-label{display:block;font:11px/1.8 var(--body);color:var(--muted);letter-spacing:.15em;margin-bottom:12px}.ad-preview-space{min-height:140px;max-width:760px;margin:auto;display:flex;align-items:center;justify-content:center;border:1px dashed #8b8a7e80;background:#fff8e84d;font-size:13px;color:var(--muted)}