@font-face{font-family:'Be Vietnam Pro';src:url('assets/be-vietnam-pro-normal-400.ttf') format('truetype');font-weight:400;font-display:swap}
@font-face{font-family:'Be Vietnam Pro';src:url('assets/be-vietnam-pro-normal-600.ttf') format('truetype');font-weight:600 800;font-display:swap}
@font-face{font-family:'Lora';src:url('assets/lora-normal-400.ttf') format('truetype');font-weight:400;font-display:swap}
@font-face{font-family:'Lora';src:url('assets/lora-italic-400.ttf') format('truetype');font-weight:400;font-style:italic;font-display:swap}
@font-face{font-family:'Instrument Serif';src:url('assets/instrument-serif-normal-400.ttf') format('truetype');font-weight:400;font-display:swap}
@font-face{font-family:'Instrument Serif';src:url('assets/instrument-serif-italic-400.ttf') format('truetype');font-weight:400;font-style:italic;font-display:swap}
:root{--ink:#211e23;--ink-deep:#19171b;--cream:#fbf1e6;--muted:#ccbdb3;--peach:#f5bc9f;--line:rgba(245,235,220,.18);--serif:'Lora',Georgia,serif;--sans:'Be Vietnam Pro',Arial,sans-serif;--paper:#f5eddf;--paper-ink:#47372e;--paper-muted:#856f5e;--paper-line:#dacbb8;--gutter:clamp(20px,4.5vw,72px);color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:104px}body{margin:0;color:var(--cream);font:14px/1.8 var(--sans);background:var(--ink);-webkit-font-smoothing:antialiased}body.book-edition{background:radial-gradient(ellipse at 50% 38%,#4b3635 0,#30262b 42%,#211e23 85%);background-attachment:fixed}button,input,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{color:inherit;cursor:pointer;border:0}button:disabled{cursor:default;opacity:.3}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--peach);outline-offset:5px}h1,h2,h3,p,figure,blockquote{margin:0}img{display:block;max-width:100%}em{font-weight:400;color:var(--peach)}::selection{background:#d89c77;color:#251d18}[hidden]{display:none!important}
.icon-library{position:absolute;width:0;height:0;overflow:hidden}.icon{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.4;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0;display:inline-block;vertical-align:middle}.visually-hidden{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}.skip-link{position:fixed;top:8px;left:16px;z-index:200;background:var(--cream);color:var(--ink);padding:8px 20px;transform:translateY(-150%)}.skip-link:focus{transform:none}
.site-header{height:86px;padding:0 var(--gutter);display:flex;align-items:center;justify-content:space-between;width:100%;border-bottom:1px solid var(--line);gap:25px;background:rgba(26,22,27,.4)}.wordmark{display:inline-flex;align-items:center;gap:11px;font-size:21px;font-weight:600;letter-spacing:4px;white-space:nowrap;line-height:1}.team-logo{width:56px;height:32px;object-fit:contain;background:#fff9ee;border-radius:6px;padding:3px 4px;flex-shrink:0}.wordmark-divider{height:24px;width:1px;background:var(--line);margin:0 9px 0 15px}.brand-caption{font-size:7px;font-weight:400;letter-spacing:1.5px}.header-nav{display:flex;align-items:center;gap:25px}.nav-button{display:flex;align-items:center;gap:10px;background:none;padding:10px 0;font-size:10px;white-space:nowrap}.small-plus{font-size:18px;color:var(--peach)}.listen-button .icon{width:16px;height:16px}.listen-button[aria-pressed="true"]{color:var(--peach)}.voice-settings-button{display:flex;align-items:center;gap:5px;background:none;padding:10px 0;font-size:10px;color:#dcc4b7}.voice-settings-button span{font-size:20px;line-height:1}.chapter-toggle{display:flex;align-items:center;gap:16px;border:1px solid var(--line);background:none;border-radius:30px;padding:9px 15px;font-size:10px}.chapter-toggle .icon{width:17px;height:17px}.chapter-toggle:hover{background:#ffffff0b}.nav-button:hover,.voice-settings-button:hover{color:var(--peach)}
.book-reader{max-width:1320px;padding:28px var(--gutter) 35px;margin:0 auto;outline:0;touch-action:pan-y}.reader-intro{display:flex;justify-content:space-between;align-items:center;color:#cbb3a5;font-size:8px;letter-spacing:1.7px;margin-bottom:26px;gap:20px}.reader-edition{color:#988780;font-size:7px}.book-spread{position:relative;max-width:1140px;margin:auto;perspective:2200px;isolation:isolate}.book-sheet{display:grid;grid-template-columns:1fr 1fr;position:relative;min-height:680px;border-radius:5px 8px 8px 5px;background:var(--paper);color:var(--paper-ink);box-shadow:0 24px 55px #0005,0 3px 0 #c6b7a2,0 6px 0 #e9ddc9,0 9px 0 #8b6e5c,0 11px 2px #0004;overflow:hidden}.book-sheet:not(.book-cover):after{content:'';position:absolute;left:50%;width:28px;top:0;bottom:0;transform:translateX(-50%);background:linear-gradient(90deg,transparent,rgba(75,51,33,.06) 28%,rgba(61,39,22,.22) 49%,rgba(61,39,22,.13) 52%,rgba(255,255,255,.16) 78%,transparent);pointer-events:none;z-index:4}.book-page{min-width:0;position:relative}.book-prose{padding:30px clamp(30px,3.6vw,55px) 28px;display:flex;flex-direction:column;align-items:flex-start;background:radial-gradient(ellipse at 100% 30%,#fff9ee40,transparent 70%),repeating-linear-gradient(0deg,#765b3d03,#765b3d03 1px,transparent 1px,transparent 4px),var(--paper);color:var(--paper-ink);border-radius:0 6px 6px 0}.page-running-head{display:block;font-size:6px;line-height:1.8;letter-spacing:1px;color:#9c8875;width:100%;border-bottom:1px solid var(--paper-line);padding-bottom:12px;text-transform:uppercase}.page-running-head>span{padding-inline:5px}.page-scene-label{font-size:7px;line-height:1.9;letter-spacing:1px;font-weight:600;color:#aa7153;margin-top:31px;padding-right:8px}.book-prose h2{font-family:var(--serif);font-size:clamp(25px,2.6vw,37px);line-height:1.4;font-weight:400;letter-spacing:-.9px;margin:13px 0 22px;outline:none}.book-prose h2 em{color:#ac694a}.page-story-text{font-family:var(--serif);font-size:14px;line-height:1.95;letter-spacing:-.12px;width:100%}.page-story-text p+p{margin-top:14px}.page-story-text>p:first-child:first-letter{float:left;font-size:47px;line-height:.85;padding:9px 7px 1px 0;color:#a76648}.paper-wonder{display:flex;align-items:flex-start;gap:10px;color:#956d55;border-top:1px solid var(--paper-line);margin-top:22px;padding-top:15px;font-family:var(--serif);font-style:italic;font-size:11px;line-height:1.9}.paper-wonder .icon{width:15px;height:15px;margin-top:3px}.text-button{display:inline-flex;align-items:center;gap:18px;padding:0 0 4px;background:none;border-bottom:1px solid #bc9b82;color:#b58367;font-size:10px;line-height:1.8}.book-prose>.text-button{margin-top:21px;color:#945d40;border-color:#cbb298;font-size:9px}.text-button:hover{color:var(--peach)}.book-prose>.text-button:hover{color:#532f1b}.paper-footer{display:flex;align-items:center;justify-content:space-between;width:100%;gap:10px;font-size:6px;letter-spacing:1.4px;color:#a28a73;border-top:1px solid var(--paper-line);padding-top:15px;margin-top:auto;min-height:38px}.book-prose>.text-button+.paper-footer,.paper-wonder+.paper-footer,.page-story-text+.paper-footer{margin-top:28px}.paper-footer>span:last-child{font-family:var(--serif);font-size:12px;letter-spacing:0;color:#987f65}.bookmark-ribbon{position:absolute;right:30px;top:0;width:22px;height:47px;display:flex;align-items:flex-start;justify-content:center;padding-top:8px;font-family:var(--serif);font-size:11px;color:#fff0dc;background:#b26c4d;clip-path:polygon(0 0,100% 0,100% 100%,50% 84%,0 100%);z-index:3}
.book-illustration{margin:0;overflow:hidden;min-height:680px;background:#b39379}.book-illustration>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center}.illustration-wash{position:absolute;inset:0;background:linear-gradient(180deg,#24192026,transparent 35%,#241b1d99 100%),linear-gradient(90deg,transparent 90%,#36221b26)}.illustration-caption{position:absolute;left:36px;right:35px;bottom:110px;color:#fff0df}.illustration-caption>span{font-size:8px;letter-spacing:2px;color:#f4c6a9}.illustration-caption>p{font-family:var(--serif);font-size:clamp(28px,3vw,43px);line-height:1.45;letter-spacing:-.6px;margin-top:17px;text-wrap:balance}.book-illustration figcaption{position:absolute;bottom:32px;left:36px;right:55px;font-size:6px;line-height:1.9;letter-spacing:.2px;color:#e9d3c4}.image-folio{position:absolute;bottom:28px;right:28px;font-family:var(--serif);font-size:12px;color:#f4dfcc}
.book-cover{display:block;width:min(470px,100%);min-height:0;aspect-ratio:.72;max-width:100%;margin:auto;background:#442c32;color:var(--cream);box-shadow:0 30px 70px #0007,4px 1px 0 #beab92,7px 2px 0 #eee2cf,10px 3px 0 #bc9d81,12px 4px 0 #402c2d;border-radius:4px 9px 9px 4px;isolation:isolate}.cover-art{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:59% center;z-index:-3;opacity:.78}.cover-shade{position:absolute;inset:0;z-index:-2;background:linear-gradient(180deg,#2f253be6,#59323c4d 53%,#2e1f28eb),linear-gradient(90deg,#38212c66,#50313a33)}.cover-frame{position:absolute;inset:20px 23px 20px 34px;border:1px solid #edbc9561;pointer-events:none}.cover-content{padding:42px 42px 31px 54px;position:relative;display:flex;flex-direction:column;align-items:center;text-align:center;min-height:100%;height:100%;aspect-ratio:.72}.cover-series{font-size:6px;letter-spacing:1.5px;color:#ecd2bd;line-height:1.9}.cover-ornament{font-size:27px;color:#e3aa85;margin:25px 0 20px}.cover-subtitle{font-size:8px;letter-spacing:2px;color:#f2d5c0}.cover-content h1{font-family:'Instrument Serif',Georgia,serif;font-size:clamp(85px,9vw,126px);font-weight:400;line-height:.93;letter-spacing:-3px;margin-top:18px}.cover-content h1 em{color:#f4c4a3}.cover-description{font-family:var(--serif);font-size:12px;line-height:1.9;color:#f3dfcf;margin-top:25px}.button{display:inline-flex;align-items:center;justify-content:space-between;gap:28px;padding:13px 22px;border-radius:40px;font-size:11px;line-height:1.6;font-weight:600;transition:background .2s,transform .2s;min-height:46px}.button:hover{transform:translateY(-2px)}.button-light{background:var(--cream);color:var(--ink)}.button-light:hover{background:var(--peach)}.button .icon{width:18px;height:18px}.cover-open{margin-top:25px;background:#f8e7d3;color:#644035;border:1px solid #edd7bc;font-size:10px;padding:11px 21px;min-height:43px}.cover-open:hover{background:#f4c3a2}.cover-signature{display:flex;align-items:center;gap:10px;font-size:6px;letter-spacing:1.5px;color:#ecd0bc;margin-top:auto;padding-top:35px}.cover-signature>img{width:42px;height:25px;object-fit:contain;filter:invert(1);mix-blend-mode:screen}.cover-spine{position:absolute;top:50%;left:8px;writing-mode:vertical-rl;transform:translateY(-50%) rotate(180deg);font-size:6px;letter-spacing:2px;color:#ecc0a682}.book-cover:before{content:'';position:absolute;top:0;bottom:0;left:0;width:25px;background:linear-gradient(90deg,#211920c9,#9c687133,#2d1c2a66);pointer-events:none;z-index:2}
.book-frontispiece{padding:30px 42px;background:linear-gradient(90deg,#eee2cd,#f6eddf);display:flex;flex-direction:column}.frontispiece-content{margin:auto;padding-block:45px;max-width:350px;text-align:center;align-self:center}.frontispiece-content>.icon{color:#ab7e58;width:34px;height:34px;stroke-width:1;margin-bottom:28px}.dedication{font-family:var(--serif);font-size:31px;line-height:1.6;letter-spacing:-.8px}.dedication em{color:#a76a49}.frontispiece-content>p:not(.dedication){font-family:var(--serif);font-size:13px;line-height:2.1;margin-top:25px;color:#8c7561}.dedication-signature,.handwritten{font-family:var(--serif);font-style:italic;font-size:14px;color:#9c6d4c;display:block;margin-top:30px}.paper-folio{display:block;text-align:center;font-size:6px;letter-spacing:2px;color:#b2997d;margin-top:auto;padding-top:28px}.contents-page{padding-top:30px}.contents-page h2{font-size:35px;line-height:1.5;margin-top:34px}.paper-contents{width:100%;margin:5px 0 20px}.paper-contents>a{display:flex;align-items:baseline;gap:13px;padding:17px 0;border-bottom:1px solid var(--paper-line);font-family:var(--serif);font-size:13px;line-height:1.8}.paper-contents>a:hover{color:#ad633f}.contents-number{font-family:'Instrument Serif',Georgia,serif;font-size:22px;color:#b98a67}.contents-dots{flex:1;min-width:8px;border-bottom:1px dotted #cbb399;align-self:center;opacity:.7}.contents-folio{font-family:var(--serif);color:#ad8b6d;font-size:11px}.contents-note{font-family:var(--serif);font-style:italic;font-size:11px;color:#9a8068;line-height:2;margin-top:8px}.paper-link{display:inline-flex;align-items:center;gap:22px;font-size:9px;line-height:1.9;color:#9a6341;border-bottom:1px solid #c6a78a;padding-bottom:4px;margin-top:24px}.paper-link:hover{color:#61351f}.contents-page>.paper-folio{align-self:center}
.ending-dedication{padding:30px 35px;background:linear-gradient(135deg,#e9d7c1,#f5e9d9);display:flex;flex-direction:column}.ending-quote{padding-block:55px;margin:auto;text-align:center}.ending-quote>.icon{width:35px;height:35px;color:#a17150;stroke-width:1;margin-bottom:30px}.ending-quote blockquote{font-family:var(--serif);font-size:clamp(23px,2.6vw,35px);line-height:1.8;letter-spacing:-1px}.ending-quote em{color:#ac694a}.ending-quote>p{font-family:var(--serif);font-size:12px;color:#94795f;line-height:2;margin-top:30px}.ending-page h2{font-size:31px;line-height:1.6;margin-top:32px}.ending-intro{font-family:var(--serif);font-size:13px;color:#947d69;line-height:2}.paper-records{display:grid;grid-template-columns:1fr 1fr;gap:20px;width:100%;margin:24px 0;border-block:1px solid var(--paper-line);padding-block:17px}.paper-records>div{display:flex;flex-direction:column}.paper-records strong{font-family:'Instrument Serif',Georgia,serif;font-size:46px;font-weight:400;line-height:1.1;color:#a26b47}.paper-records strong small{font-size:21px}.paper-records span{font-family:var(--serif);font-size:10px;color:#a28c74;margin-top:7px}.paper-action{display:flex;align-items:center;justify-content:space-between;gap:15px;width:100%;text-align:left;background:none;color:#775139;border-bottom:1px solid var(--paper-line);padding:15px 0;font-family:var(--serif);font-size:13px;line-height:1.8}.paper-action small{display:block;font-family:var(--sans);font-size:5px;letter-spacing:.9px;color:#b29a80;margin-bottom:4px}.paper-action .icon{width:16px;height:16px;color:#ad8665}.paper-action:hover{color:#b2663c}.close-book-link{margin-bottom:28px}.book-ending .paper-footer{margin-top:auto}
.book-navigation{max-width:1110px;display:grid;grid-template-columns:1fr auto 1fr;gap:25px;align-items:center;margin:30px auto 0;padding-top:3px}.page-nav-button{display:inline-flex;align-items:center;justify-self:start;gap:13px;padding:10px 0;min-height:43px;background:none;font-size:10px;color:#dfcbbb}.page-nav-button .icon{width:17px;height:17px}.previous-arrow{transform:rotate(180deg)}.page-nav-button:not(:disabled):hover{color:var(--peach)}.next-page-button{justify-self:end}.book-position{width:200px;text-align:center}.book-position>p{font-family:var(--serif);font-size:14px;color:#e4ccb7}.book-position>span{display:block;font-size:6px;letter-spacing:.5px;color:#ab9183;margin-top:5px;line-height:1.8}.book-progress-track{height:1px;background:#f4c8a61c;margin:10px auto 0;max-width:130px}.book-progress-track>span{display:block;width:100%;height:1px;background:#c9956e;transform:scaleX(0);transform-origin:left;transition:transform .4s}.book-reading-hint{text-align:center;margin-top:23px;font-family:var(--serif);font-style:italic;font-size:10px;color:#b69c8c}.book-reading-hint>span{display:block;font-family:var(--sans);font-style:normal;font-size:7px;color:#8a7670;margin-top:6px;letter-spacing:.2px}
.page-turn{position:absolute;top:0;bottom:0;width:50%;right:0;z-index:10;transform-origin:left center;background:var(--paper);pointer-events:none;transform-style:preserve-3d;backface-visibility:hidden;box-shadow:-12px 0 35px #2d1b1b26;overflow:hidden;animation:leaf-forward .58s cubic-bezier(.24,.48,.26,1) both}.page-turn.backward{left:0;right:auto;transform-origin:right center;animation-name:leaf-backward}.page-turn .book-page{width:100%;height:100%;min-height:0;border-radius:0}.page-turn:after{content:'';position:absolute;inset:0;pointer-events:none;background:linear-gradient(90deg,#6e4d330d,transparent 65%,#684a322e)}.book-sheet.arriving .book-prose{animation:ink-arrival .45s ease both}.book-cover.cover-arriving{animation:cover-arrival .5s ease both}.book-spread.is-cover{max-width:470px}.book-spread.is-cover+.book-navigation{max-width:630px}
@keyframes leaf-forward{0%{transform:rotateY(0);opacity:1}78%{opacity:1}100%{transform:rotateY(-175deg);opacity:0}}@keyframes leaf-backward{0%{transform:rotateY(0);opacity:1}78%{opacity:1}100%{transform:rotateY(175deg);opacity:0}}@keyframes ink-arrival{from{opacity:.35}to{opacity:1}}@keyframes cover-arrival{from{opacity:.5;transform:rotateY(-12deg)}to{opacity:1;transform:rotateY(0)}}@keyframes dialog-in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}
.site-footer{padding:28px var(--gutter);display:flex;justify-content:space-between;gap:25px;align-items:center;background:rgba(17,14,19,.25);border-top:1px solid var(--line)}.site-footer>.wordmark{font-size:16px}.site-footer .team-logo{width:44px;height:27px}.site-footer p{font-size:9px;line-height:2;color:#c6b5ac}.site-footer p span{font-size:8px;color:#8f8580}.site-footer .text-button{font-size:8px}.toast{position:fixed;bottom:26px;left:50%;transform:translate(-50%,20px);opacity:0;transition:opacity .2s,transform .2s;background:var(--cream);color:var(--ink);box-shadow:0 4px 30px #0005;font-size:11px;padding:12px 20px;border-radius:6px;z-index:100;pointer-events:none;max-width:90vw;width:max-content}.toast.show{opacity:1;transform:translate(-50%,0)}.section-kicker{font-size:9px;letter-spacing:1.5px;color:var(--peach)}
/* Native dialogs provide focus management, Escape support and a modal backdrop. */
dialog{border:1px solid #5a4841;color:var(--cream);background:#222023;padding:44px;width:min(660px,calc(100% - 32px));max-height:calc(100svh - 40px);overscroll-behavior:contain;margin:auto;border-radius:5px;scrollbar-width:thin;scrollbar-color:#806455 transparent;box-shadow:0 20px 100px #0008}
dialog::backdrop{background:rgba(9,9,12,.78);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px)}
dialog[open]{animation:dialog-in .25s ease both}
.dialog-topline{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:26px}
.dialog-topline>.section-kicker{font-size:8px;letter-spacing:1.4px}
.close-button{width:32px;height:32px;display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;background:none;flex-shrink:0;transition:background .2s}
.close-button:hover{background:rgba(245,240,231,.1)}
.close-button .icon{width:16px;height:16px}
dialog h2{font-family:var(--serif);font-weight:400;font-size:44px;line-height:1.07;letter-spacing:-.5px;margin-bottom:24px}
dialog p{font-size:13px;line-height:1.9;color:#c9bdb5;margin-block:16px}
dialog h3{font-weight:600;font-size:12px;margin-top:28px;color:var(--peach)}
dialog .credit-text{font-size:11px;color:#a99c95}
dialog .credit-text a{text-decoration:underline;text-underline-offset:3px;color:#e6c6b4}
.button-outline{border:1px solid var(--line);background:none;color:var(--cream);padding:13px 22px;min-height:45px;font-size:11px;margin-top:18px}
.button-outline:hover{background:#ffffff09}
.source-links{display:flex;flex-direction:column;margin-top:15px}
.source-links a{display:flex;align-items:center;justify-content:space-between;gap:14px;border-top:1px solid var(--line);font-size:11px;padding:13px 0}
.source-links a:hover{color:var(--peach)}
.source-links a span{color:var(--peach)}
.chapters-dialog{width:min(650px,calc(100% - 32px));padding:40px}
.chapters-dialog h2{font-size:48px;margin-bottom:30px}
.chapters-dialog nav{display:flex;flex-direction:column}
.chapters-dialog nav a{display:flex;align-items:center;gap:20px;border-top:1px solid var(--line);padding:19px 0;transition:color .2s}
.chapters-dialog nav a:hover{color:var(--peach)}
.chapters-dialog nav a>span{font-size:10px;color:var(--peach);font-family:var(--serif);font-size:22px}
.chapters-dialog nav a>div{flex:1;font-size:13px}
.chapters-dialog small{display:block;font-size:10px;font-weight:400;color:#a4968f;margin-top:4px}
.chapters-dialog nav .icon{width:17px;height:17px}
.dialog-endnote{display:block;font-size:7px;letter-spacing:1.4px;color:#a4958c;margin-top:28px;line-height:1.9}
.fact-data{margin-block:24px;display:grid;grid-template-columns:1fr 1fr;border-block:1px solid var(--line)}
.fact-data>div{padding:22px 12px}
.fact-data>div+div{border-left:1px solid var(--line)}
.fact-data strong{display:block;font-family:var(--serif);font-weight:400;font-size:44px;line-height:1.1;color:var(--peach)}
.fact-data span{font-size:8px;letter-spacing:1px;color:#ad9b90;display:block;margin-top:8px}
.fact-body-link{font-size:11px;color:var(--peach);text-decoration:underline;text-underline-offset:4px}
.lab-tabs{display:flex;border-bottom:1px solid var(--line);margin:26px 0}
.lab-tabs button{background:none;padding:12px 5px;font-size:10px;flex:1;border-bottom:2px solid transparent;color:#b8aaa1}
.lab-tabs button[aria-selected="true"]{color:var(--peach);border-color:var(--peach)}
.slider-label{display:flex;justify-content:space-between;font-size:12px;margin-top:26px}
.slider-label output{color:var(--peach);font-weight:600}
input[type="range"]{width:100%;margin:15px 0 20px;accent-color:var(--peach);cursor:pointer}
.gravity-results{display:grid;grid-template-columns:1fr 1fr;background:rgba(255,255,255,.025);border:1px solid var(--line);border-radius:3px}
.gravity-results>div{padding:26px 20px;display:flex;align-items:start;flex-direction:column}
.gravity-results>div+div{border-left:1px solid var(--line)}
.gravity-results .icon{width:25px;height:25px;color:#aeb8cd;margin-bottom:18px}
.gravity-results>div>span:not(.mars-planet){font-size:8px;letter-spacing:1.6px;color:#b0a29a}
.gravity-results strong{font-family:var(--serif);font-weight:400;font-size:40px;letter-spacing:-1px;line-height:1.2;margin-top:10px}
.gravity-results small{font-size:22px}
.gravity-results p{font-size:9px;margin:6px 0 0}
.mars-result strong{color:var(--peach)}
.mars-planet{width:25px;height:25px;border-radius:50%;background:linear-gradient(145deg,#e4ab87,#935847);box-shadow:inset -6px -3px 0 rgba(25,25,29,.22);margin-bottom:18px}
dialog .lab-explanation{font-size:10px;margin-top:22px;color:#a99b93;border-top:1px solid var(--line);padding-top:17px}
fieldset{border:0;padding:0;margin:0}
legend{font-size:14px;line-height:1.7;margin-bottom:18px;padding:0}
.quiz-option{display:flex;align-items:center;gap:13px;padding:13px 15px;border:1px solid var(--line);margin:9px 0;font-size:12px;border-radius:3px;cursor:pointer}
.quiz-option:has(input:checked){border-color:var(--peach);background:rgba(243,178,145,.07)}
.quiz-option input{accent-color:var(--peach);margin:0;width:15px;height:15px;flex-shrink:0}
#engineer-form .button{margin-top:18px;min-height:42px;padding:11px 20px;font-size:10px}
dialog .quiz-feedback{font-size:12px;color:var(--peach)}
body.has-dialog{overflow:hidden}
[hidden]{display:none!important}

/* The same voice controls and learning activities live behind the book's bookmarks. */
dialog{border-radius:17px;background:#2a2429;border-color:#785d50}dialog h2{font-size:33px;line-height:1.5;letter-spacing:-1px}.chapters-dialog h2{font-size:35px;line-height:1.45}.chapters-dialog nav a>div{font-size:12px;line-height:1.9}.source-links a{font-size:10px;line-height:1.9}.sources-dialog>.button{display:flex;width:max-content;max-width:100%;gap:20px}.button-outline{padding:12px 20px}.voice-label{font-size:12px;display:block;margin-top:24px}#voice-select{display:block;width:100%;margin-top:10px;padding:12px;border:1px solid var(--line);background:#211e23;color:var(--cream);border-radius:8px;font:inherit;font-size:12px;line-height:1.5}.voice-status{font-size:11px;color:var(--peach);line-height:1.8}.voice-dialog .slider-label{font-size:11px}.voice-dialog .slider-label output{font-size:10px}#voice-preview{padding:13px 20px;margin-top:14px;font-size:11px}.fact-data strong,.gravity-results strong{font-family:'Instrument Serif',Georgia,serif}.lab-tabs button{font-size:9px;line-height:1.8}.quiz-option{border-radius:9px;padding:14px}.quiz-option span{line-height:1.9}.gravity-results{border-radius:12px}.gravity-results>div>span:not(.mars-planet){font-size:7px;letter-spacing:1px}.gravity-results p{font-size:8px}.appendix-records{display:grid;grid-template-columns:1fr 1fr;gap:20px;padding:25px 0;border-block:1px solid var(--line);margin-top:25px}.appendix-records>div{display:flex;flex-direction:column}.appendix-records strong{font-family:'Instrument Serif',Georgia,serif;font-size:34px;line-height:1.3;font-weight:400;color:var(--peach)}.appendix-records span{font-size:9px;color:#c3afa3}.appendix-timeline{list-style:none;padding:0;margin:35px 0 0}.appendix-timeline li{display:flex;gap:25px;padding:18px 0;border-top:1px solid var(--line)}.appendix-timeline time{font-size:9px;color:var(--peach);flex-shrink:0;line-height:2}.appendix-timeline strong{font-size:12px;font-weight:400}.appendix-timeline p{font-size:11px;margin:6px 0 0;line-height:1.9}
@media(min-width:1450px){.book-reader{padding-top:35px}.book-prose{padding-inline:55px}.page-story-text{font-size:15px;line-height:2}.book-sheet{min-height:740px}.book-illustration{min-height:740px}.book-prose h2{font-size:37px}.book-cover{min-height:0}.cover-content h1{font-size:126px}}
@media(max-width:1100px){.wordmark-divider,.brand-caption{display:none}.header-nav{gap:20px}.book-reader{padding-inline:30px}.book-prose{padding-inline:32px}.page-story-text{font-size:13px;line-height:2}.book-prose h2{font-size:29px}.book-sheet,.book-illustration{min-height:690px}.book-cover{min-height:0;max-width:420px}.cover-content{padding:35px 35px 30px 46px}.cover-ornament{margin-block:19px 15px}.cover-content h1{font-size:111px}.cover-description{font-size:11px;margin-top:21px}.cover-signature{padding-top:24px}.cover-frame{inset:17px 19px 17px 30px}.book-frontispiece{padding-inline:33px}.dedication{font-size:27px}.frontispiece-content>p:not(.dedication){font-size:12px}.illustration-caption{left:30px;right:30px}.illustration-caption>p{font-size:32px}.paper-contents>a{font-size:12px;gap:9px}.contents-page h2{font-size:32px}.book-cover .cover-series{font-size:5.5px}.reader-intro{font-size:7px}.reader-edition{font-size:6px}}
@media(max-width:760px){:root{--gutter:20px}html{scroll-padding-top:15px}.site-header{height:73px;padding-inline:20px;gap:15px}.wordmark{font-size:16px;letter-spacing:2px;gap:7px}.team-logo{width:42px;height:27px}.header-nav{gap:13px}.nav-button[data-dialog="sources"]{display:none}.listen-button{font-size:9px;gap:6px}.listen-button .icon{width:15px;height:15px}.voice-settings-button{font-size:9px}.voice-settings-button>span{display:none}.chapter-toggle{font-size:9px;padding:8px 10px;gap:8px}.chapter-toggle .icon{width:15px;height:15px}.book-reader{padding:24px 20px 28px}.reader-intro{font-size:6px;letter-spacing:1.1px;justify-content:center;margin-bottom:22px}.reader-edition{display:none}.book-spread{max-width:510px}.book-sheet{grid-template-columns:1fr;min-height:0;border-radius:4px 8px 8px 4px;box-shadow:0 18px 40px #0005,2px 2px 0 #c4ac8e,4px 4px 0 #edddc6,6px 6px 0 #83654f}.book-sheet:not(.book-cover):after{display:none}.book-prose{padding:27px 29px 26px;border-radius:0 0 5px 5px;min-height:0}.book-illustration{min-height:0;height:260px}.book-illustration>img{object-position:50% 45%}.illustration-caption{left:25px;right:30px;bottom:48px}.illustration-caption>span{font-size:6px;letter-spacing:1.4px}.illustration-caption>p{font-size:25px;max-width:300px;line-height:1.45;margin-top:9px}.book-illustration figcaption{left:25px;right:25px;bottom:15px;font-size:5px}.image-folio{display:none}.bookmark-ribbon{right:23px;width:19px;height:41px;font-size:9px}.page-running-head{font-size:5px;letter-spacing:.7px;line-height:2;padding-right:15px}.page-scene-label{font-size:6px;letter-spacing:.7px;margin-top:24px}.book-prose h2{font-size:28px;line-height:1.5;margin-top:13px;margin-bottom:22px;letter-spacing:-.7px}.page-story-text{font-size:14px;line-height:2;letter-spacing:-.2px}.page-story-text p+p{margin-top:17px}.paper-wonder{font-size:11px;line-height:1.9;margin-top:24px}.book-prose>.text-button{font-size:9px}.paper-footer{margin-top:30px!important;font-size:5px;letter-spacing:1px;min-height:30px;padding-top:12px}.paper-footer>span:last-child{font-size:11px}.book-cover{width:min(360px,calc(100% - 4px));max-width:100%;min-height:0}.book-spread.is-cover{max-width:360px}.cover-content{padding:32px 30px 26px 40px;min-height:0}.cover-series{font-size:5px!important;letter-spacing:1px}.cover-ornament{font-size:22px;margin-block:19px 15px}.cover-subtitle{font-size:7px;letter-spacing:1.4px}.cover-content h1{font-size:100px;margin-top:15px}.cover-description{font-size:11px;margin-top:20px}.cover-open{font-size:9px;min-height:38px;padding:9px 17px;margin-top:22px;gap:20px}.cover-signature{font-size:5px;letter-spacing:1px;padding-top:25px}.cover-signature>img{width:36px;height:21px}.cover-frame{inset:16px 17px 16px 28px}.cover-spine{font-size:5px;left:7px;letter-spacing:1.7px}.book-cover:before{width:20px}.book-frontispiece{padding:27px 28px 35px;min-height:0}.frontispiece-content{padding-block:35px 5px}.frontispiece-content>.icon{width:27px;height:27px;margin-bottom:22px}.dedication{font-size:26px;line-height:1.6}.frontispiece-content>p:not(.dedication){font-size:13px;margin-top:22px}.dedication-signature{font-size:13px;margin-top:23px}.book-frontispiece>.paper-folio{display:none}.contents-page{border-top:1px solid var(--paper-line);padding-top:27px}.contents-page h2{font-size:30px;margin-top:26px}.paper-contents>a{font-size:12px;padding-block:16px;gap:12px}.contents-number{font-size:23px}.contents-folio{display:none}.contents-dots{display:none}.contents-page>.paper-folio{margin-top:30px;font-size:5px}.contents-note{font-size:11px}.ending-dedication{padding:27px 28px 20px}.ending-dedication>.paper-folio{display:none}.ending-quote{padding-block:40px 25px}.ending-quote blockquote{font-size:25px;line-height:1.8}.ending-quote>p{font-size:12px}.handwritten{font-size:12px}.ending-page{border-top:1px solid var(--paper-line)}.ending-page h2{font-size:28px;margin-top:25px}.ending-intro{font-size:13px}.paper-records strong{font-size:45px}.paper-action{font-size:12px}.paper-action small{font-size:5px;letter-spacing:.6px}.book-navigation{gap:10px;margin-top:26px;max-width:510px}.book-position{width:120px}.book-position>p{font-size:13px}.book-position>span{font-size:5.5px;max-width:120px}.book-progress-track{max-width:90px}.page-nav-button{gap:6px;font-size:8px;min-height:44px}.page-nav-button .icon{width:15px;height:15px}.book-reading-hint{font-size:9px;line-height:2;margin-top:17px}.book-reading-hint>span{font-size:6px;max-width:290px;margin:4px auto 0;line-height:1.9}.page-turn{display:none}.book-sheet.arriving .book-prose{animation:ink-arrival .4s ease both}.book-cover.cover-arriving{animation:none}.site-footer{flex-wrap:wrap;padding-block:25px;gap:23px}.site-footer>.wordmark{font-size:15px}.site-footer p{order:3;flex-basis:100%;font-size:8px}.site-footer p span{font-size:7px}.site-footer .text-button{font-size:7px}.site-footer .team-logo{width:38px;height:25px}dialog{padding:26px;max-height:calc(100svh - 30px)}dialog h2,.chapters-dialog h2{font-size:28px;line-height:1.5}.dialog-topline{margin-bottom:22px}.dialog-topline>.section-kicker{font-size:6px;letter-spacing:1px}dialog p{font-size:12px}.chapters-dialog{padding:26px}.chapters-dialog nav a{gap:15px;padding:15px 0}.chapters-dialog nav a>div{font-size:11px}.chapters-dialog small{font-size:9px}.chapters-dialog nav a>span{font-size:19px}.chapters-dialog nav .icon{width:15px;height:15px}.dialog-endnote{font-size:6px;letter-spacing:1px}.gravity-results>div{padding:20px 15px}.gravity-results strong{font-size:33px}.gravity-results p{font-size:7px}.lab-tabs button{font-size:8px}.fact-data strong{font-size:37px}.voice-dialog .slider-label{font-size:10px;gap:15px}.source-links a{font-size:10px}.appendix-records strong{font-size:30px}.appendix-timeline li{gap:18px}.appendix-timeline time{font-size:8px}}
@media(max-width:380px){.site-header{padding-inline:16px;gap:10px}.header-nav{gap:10px}.chapter-toggle>span{display:none}.chapter-toggle{padding:8px}.wordmark{font-size:15px}.team-logo{width:37px;height:25px}.book-reader{padding-inline:15px}.cover-content h1{font-size:91px}.cover-content{padding-top:28px}.cover-description{font-size:10px;margin-top:18px}.cover-ornament{margin-block:15px}.cover-signature{padding-top:20px}.cover-subtitle{font-size:6px}.cover-open{margin-top:18px}.cover-series{font-size:4.5px!important}.book-prose{padding-inline:24px}.book-prose h2{font-size:26px}.page-story-text{font-size:13px}.book-position{width:108px}.page-nav-button{font-size:7px;gap:5px}.book-illustration{height:235px}.illustration-caption>p{font-size:23px}.ending-quote blockquote{font-size:23px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}.page-turn{display:none}}
@media print{body.book-edition{background:white;color:black}.site-header,.site-footer,.book-navigation,.book-reading-hint,.reader-intro,.toast,dialog,.page-turn,.paper-action,.paper-link,.text-button,.cover-open,.skip-link,.cover-spine{display:none!important}.book-reader{padding:0;max-width:none}.book-spread,.book-spread.is-cover{max-width:none}.book-sheet,.book-sheet[hidden]{display:grid!important;box-shadow:none;border-radius:0;break-inside:avoid;page-break-after:always;min-height:0;margin-bottom:25px;border:1px solid #ccc}.book-sheet:after{display:none}.book-cover{display:block!important;width:100%;height:700px;color:black}.cover-content{aspect-ratio:auto;height:100%;padding:50px}.cover-content h1,.cover-content em,.cover-series,.cover-subtitle,.cover-description{color:#422c22}.cover-art{opacity:.3}.cover-shade,.cover-frame{display:none}.cover-signature{color:black}.cover-signature>img{filter:none}.book-prose,.book-frontispiece,.ending-dedication{background:white;padding:25px}.book-illustration{min-height:600px}.page-story-text{font-size:12px;line-height:1.9}.book-prose h2{font-size:25px}.paper-footer{margin-top:25px}.book-prose em{color:#925537}.paper-wonder{color:#704b36}}
.book-spread:not(.enhanced)>.book-sheet{margin-bottom:35px}
/* Let the cover grow with its lettering rather than clipping on short screens. */
.book-cover{aspect-ratio:auto}.cover-content{height:auto;aspect-ratio:auto;min-height:650px}.cover-ornament{line-height:1}
.illustration-quote{font-family:var(--serif);font-size:29px;line-height:1.7;color:#fff0df;margin-top:18px;letter-spacing:-.7px}.illustration-caption cite{display:block;font-family:var(--sans);font-size:7px;font-style:normal;letter-spacing:.6px;color:#edcbb4;margin-top:20px}
@media(max-width:1100px){.cover-content{min-height:620px}.illustration-quote{font-size:26px}}
@media(max-width:760px){.cover-content{min-height:550px}.illustration-quote{font-size:17px;line-height:1.7;letter-spacing:-.2px;margin-top:10px}.illustration-caption cite{font-size:5px;margin-top:10px}.book-cover{min-height:0}}
@media(max-width:380px){.cover-content{min-height:520px}}
@media print{.cover-content{min-height:0;height:100%}.illustration-quote{font-size:24px}}
/* Bilingual editions share one book; switching language keeps the open page. */
.language-switch{display:inline-flex;align-items:center;gap:2px;padding:3px;border:1px solid var(--line);border-radius:25px;background:#17121b22;flex-shrink:0}
.language-switch button{background:none;color:#cbb6a8;border-radius:20px;min-width:31px;min-height:31px;padding:4px 7px;font-size:9px;line-height:1.6;letter-spacing:.5px;transition:background .2s,color .2s}
.language-switch button[aria-pressed="true"]{background:#eedac3;color:#513d31}
.language-switch button:not([aria-pressed="true"]):hover{color:var(--peach)}
html[lang="en"] .cover-series{letter-spacing:1.2px}
html[lang="en"] .cover-subtitle{font-size:9px;letter-spacing:1.5px}
html[lang="en"] .page-story-text{letter-spacing:0}
html[lang="en"] .illustration-caption>p{font-size:clamp(27px,2.8vw,40px)}
@media(max-width:1100px){.header-nav{gap:16px}.language-switch button{font-size:8px;min-width:29px;min-height:30px}}
@media(max-width:760px){.header-nav{gap:10px}.language-switch{padding:2px}.language-switch button{min-width:28px;min-height:31px;font-size:8px;padding-inline:5px}.chapter-toggle>span{display:none}.chapter-toggle{padding:8px}.reader-intro{font-size:5.5px}.book-position>span{font-size:5px}html[lang="en"] .illustration-caption>p{font-size:25px}html[lang="en"] .cover-subtitle{font-size:7px}html[lang="en"] .cover-series{font-size:5px!important;letter-spacing:.8px}}
@media(max-width:450px){.listen-button>span{display:none}.listen-button{min-width:26px;min-height:35px;justify-content:center}.site-header{gap:10px}}
@media(max-width:380px){.site-header{padding-inline:14px}.team-logo{width:34px;height:25px}.wordmark{gap:6px;font-size:14px}.header-nav{gap:7px}.language-switch button{min-width:27px;min-height:31px}.voice-settings-button{font-size:8px}.chapter-toggle{padding:7px}.listen-button{min-width:24px}.language-switch{gap:0}html[lang="en"] .illustration-caption>p{font-size:23px}}
@media print{.language-switch{display:none}}
/* Viewport-sized reader. Single-page CSS must match SINGLE_PAGE_QUERY in script.js. */
@media screen {
  html { -webkit-text-size-adjust:100%; text-size-adjust:100%; scroll-padding-top:16px; }
  body.book-edition { min-height:100vh; min-height:100dvh; font-size:16px; }
  .site-header { min-height:76px; height:76px; padding-inline:max(20px,env(safe-area-inset-left)) max(20px,env(safe-area-inset-right)); gap:20px; }
  .brand-caption { font-size:10px; letter-spacing:1px; }
  .header-nav { gap:20px; }
  .nav-button,.listen-button,.voice-settings-button,.chapter-toggle { font-size:13px; min-height:44px; }
  .chapter-toggle { padding:9px 17px; }
  .chapter-toggle>span,.listen-button>span { display:inline; }
  .language-switch button { min-width:38px; min-height:36px; font-size:12px; padding:6px; }
  .book-reader { width:100%; max-width:none; padding:12px clamp(12px,1.6vw,32px) 12px; margin:0; }
  .reader-intro { min-height:18px; margin-bottom:12px; font-size:10px; letter-spacing:1.2px; }
  .reader-edition { font-size:9px; }
  .book-spread { width:100%; max-width:none; height:calc(100vh - 238px); height:calc(100dvh - 238px); min-height:420px; }
  .book-sheet { width:100%; height:100%; min-height:0; }
  .book-page { min-height:0; }
  .book-illustration { height:100%; min-height:0; }
  .book-prose,.book-frontispiece,.ending-dedication { min-height:0; overflow-y:auto; overscroll-behavior-y:contain; -webkit-overflow-scrolling:touch; scrollbar-width:thin; scrollbar-color:#b89a7b #e9ddcb; }
  .book-prose { padding:clamp(28px,2.5vh,45px) clamp(32px,4vw,100px) 28px; }
  .book-prose:focus-visible { outline:2px solid #b17a58; outline-offset:-5px; }
  .page-story-text { font-size:clamp(18px,1.18vw,24px); line-height:1.85; letter-spacing:0; max-inline-size:68ch; flex-shrink:0; }
  .page-story-text p+p { margin-top:1em; }
  .page-story-text>p:first-child:first-letter { font-size:3.1em; padding-top:.12em; padding-right:.15em; }
  .book-prose h2 { font-size:clamp(30px,2.2vw,48px); line-height:1.4; margin:14px 0 24px; flex-shrink:0; }
  .page-running-head { font-size:10px; line-height:1.9; letter-spacing:.7px; padding:0 26px 13px 0; flex-shrink:0; }
  .page-scene-label { font-size:11px; line-height:1.9; letter-spacing:.8px; margin-top:25px; flex-shrink:0; }
  .bookmark-ribbon { width:28px; height:57px; right:24px; padding-top:10px; font-size:14px; }
  .paper-wonder { font-size:15px; line-height:1.9; margin-top:24px; padding-top:18px; flex-shrink:0; }
  .paper-wonder .icon { width:19px; height:19px; }
  .book-prose>.text-button { font-size:13px; min-height:44px; margin-top:18px; flex-shrink:0; }
  .paper-footer { font-size:9px; line-height:1.9; min-height:45px; padding-top:17px; margin-top:30px; flex-shrink:0; }
  .paper-footer>span:last-child { font-size:16px; }
  .illustration-caption { left:clamp(28px,3vw,70px); right:38px; bottom:105px; }
  .illustration-caption>span { font-size:12px; letter-spacing:1.6px; }
  .illustration-caption>p,html[lang="en"] .illustration-caption>p { font-size:clamp(32px,2.6vw,58px); line-height:1.45; max-width:22ch; }
  .illustration-quote { font-size:clamp(25px,2.1vw,43px); line-height:1.65; max-width:27ch; }
  .illustration-caption cite { font-size:11px; line-height:1.8; margin-top:20px; }
  .book-illustration figcaption { font-size:10px; line-height:1.8; left:clamp(28px,3vw,70px); right:65px; bottom:30px; }
  .image-folio { font-size:16px; bottom:28px; right:29px; }
  .book-navigation,.book-reader .book-spread.is-cover+.book-navigation { max-width:none; width:100%; margin-top:14px; padding-top:0; min-height:64px; }
  .book-position { width:clamp(200px,24vw,400px); }
  .book-position>p { font-size:19px; }
  .book-position>span { font-size:11px; line-height:1.7; max-width:none; }
  .book-progress-track { max-width:200px; margin-top:7px; height:2px; }
  .book-progress-track>span { height:2px; }
  .page-nav-button { font-size:14px; min-height:48px; gap:12px; padding:8px 12px; }
  .page-nav-button .icon { width:22px; height:22px; }
  .book-reading-hint { margin-top:8px; font-size:12px; }
  .book-reading-hint>span { font-size:10px; max-width:none; margin-top:2px; }
  .book-spread.is-cover { max-width:none; height:auto; min-height:0; }
  .book-cover { width:min(100%,680px); max-width:none; height:auto; min-height:0; }
  .cover-content { min-height:700px; height:auto; padding:42px 48px 35px 63px; }
  .book-reader .book-cover .cover-series { font-size:11px!important; letter-spacing:1.2px; }
  .cover-subtitle,html[lang="en"] .cover-subtitle { font-size:13px; letter-spacing:1.4px; }
  .cover-content h1 { font-size:clamp(125px,10vw,172px); }
  .cover-description { font-size:18px; margin-top:25px; }
  .cover-open { font-size:15px; min-height:50px; padding:12px 26px; }
  .cover-signature { font-size:10px; letter-spacing:1.2px; padding-top:35px; }
  .cover-signature>img { width:52px; height:31px; }
  .cover-spine { font-size:9px; }
  .book-frontispiece,.ending-dedication { padding:30px clamp(32px,4vw,90px); }
  .frontispiece-content { max-width:42ch; padding-block:35px; }
  .dedication { font-size:clamp(30px,2.4vw,48px); }
  .frontispiece-content>p:not(.dedication),.ending-intro,.ending-quote>p { font-size:clamp(17px,1.1vw,21px); line-height:1.95; }
  .dedication-signature,.handwritten { font-size:19px; }
  .paper-folio { font-size:11px; }
  .contents-page h2 { font-size:clamp(32px,2.5vw,48px); }
  .paper-contents>a { font-size:clamp(16px,1.1vw,22px); line-height:1.8; min-height:60px; gap:15px; padding:18px 0; }
  .contents-number { font-size:30px; }
  .contents-folio { font-size:16px; }
  .contents-note { font-size:16px; }
  .paper-link { font-size:14px; min-height:44px; align-items:center; margin-top:22px; flex-shrink:0; }
  .ending-quote blockquote { font-size:clamp(28px,2.3vw,46px); }
  .paper-records strong { font-size:60px; }
  .paper-records span { font-size:15px; }
  .paper-action { font-size:17px; min-height:72px; flex-shrink:0; }
  .paper-action small { font-size:9px; line-height:1.8; letter-spacing:.5px; }
  .paper-action .icon { width:21px; height:21px; }
  .site-footer p,.site-footer .text-button { font-size:12px; }
  .site-footer p span { font-size:11px; }
  .page-turn .book-page { scrollbar-width:none; }
  dialog { width:min(760px,calc(100vw - 32px)); max-height:calc(100vh - 32px); max-height:calc(100dvh - 32px); padding:clamp(24px,3vw,44px); }
  dialog p { font-size:16px; line-height:1.9; }
  dialog h2,.chapters-dialog h2 { font-size:clamp(28px,3vw,40px); }
  dialog h3 { font-size:16px; }
  .dialog-topline>.section-kicker { font-size:11px; line-height:1.9; }
  .close-button { width:44px; height:44px; }
  .close-button .icon { width:21px; height:21px; }
  .chapters-dialog nav a { min-height:72px; }
  .chapters-dialog nav a>div { font-size:16px; }
  .chapters-dialog small { font-size:13px; }
  .dialog-endnote { font-size:11px; line-height:1.9; }
  .source-links a { font-size:14px; min-height:48px; }
  dialog .credit-text,dialog .lab-explanation { font-size:13px; line-height:1.9; }
  .voice-label,.voice-status,.voice-dialog .slider-label,.slider-label { font-size:15px; }
  .voice-dialog .slider-label output { font-size:14px; }
  #voice-select { min-height:48px; font-size:16px; }
  input[type="range"] { min-height:44px; margin-block:8px 12px; }
  .lab-tabs button { min-height:52px; font-size:13px; padding:12px 8px; }
  legend { font-size:17px; }
  .quiz-option { min-height:56px; font-size:16px; }
  .gravity-results>div>span:not(.mars-planet) { font-size:12px; }
  .gravity-results p { font-size:12px; }
  .gravity-results strong { font-size:45px; }
  #voice-preview,#engineer-form .button,.button-outline { min-height:48px; font-size:14px; }
  dialog .quiz-feedback { font-size:15px; }
  .fact-data span { font-size:11px; line-height:1.8; }
  .appendix-records span { font-size:14px; }
  .appendix-timeline time { font-size:13px; }
  .appendix-timeline strong { font-size:16px; }
  .appendix-timeline p { font-size:14px; }
  .toast { font-size:14px; line-height:1.8; white-space:normal; text-align:center; }
}
@media screen and (min-width:901px) and (max-width:1280px) {
  .brand-caption,.wordmark-divider { display:none; }
  .header-nav { gap:14px; }
  .book-prose { padding-inline:32px; }
}
@media screen and (max-width:900px), screen and (max-width:1180px) and (orientation:portrait), screen and (max-height:520px) and (pointer:coarse) {
  html { scroll-padding-top:128px; }
  body.book-edition { background-attachment:scroll; padding-bottom:calc(98px + env(safe-area-inset-bottom)); }
  .site-header { position:sticky; top:0; z-index:30; display:grid; grid-template-columns:1fr; height:auto; min-height:112px; gap:4px; padding:8px max(16px,env(safe-area-inset-left)) 6px max(16px,env(safe-area-inset-right)); background:rgba(33,28,35,.97); }
  .wordmark { font-size:18px; gap:8px; min-height:44px; letter-spacing:2px; width:max-content; }
  .team-logo { width:44px; height:29px; }
  .brand-caption,.wordmark-divider { display:none; }
  .header-nav { grid-column:1/-1; justify-content:space-between; gap:8px; width:100%; }
  .nav-button[data-dialog="sources"] { display:none; }
  .header-nav .language-switch { position:absolute; right:max(16px,env(safe-area-inset-right)); top:10px; }
  .language-switch button { min-width:36px; min-height:34px; font-size:12px; }
  .listen-button,.voice-settings-button,.chapter-toggle { font-size:13px; min-height:44px; padding:8px 13px; gap:8px; }
  .listen-button>span,.chapter-toggle>span { display:inline; }
  .voice-settings-button>span { display:none; }
  .chapter-toggle .icon,.listen-button .icon { width:19px; height:19px; }
  .book-reader { padding:12px max(10px,env(safe-area-inset-left)) 14px max(10px,env(safe-area-inset-right)); }
  .reader-intro { font-size:10px; justify-content:center; min-height:22px; margin-bottom:10px; letter-spacing:.7px; }
  .reader-edition { display:none; }
  .book-spread,.book-spread.is-cover { width:100%; max-width:none; height:auto; min-height:0; }
  .book-sheet { display:grid; grid-template-columns:minmax(0,1fr); width:100%; height:auto; min-height:0; }
  .book-sheet:not(.book-cover):after { display:none; }
  .book-cover { display:block; max-width:680px; width:100%; height:auto; margin:auto; }
  .cover-content { min-height:620px; padding:35px 34px 30px 46px; }
  .book-reader .book-cover .cover-series { font-size:10px!important; }
  .cover-subtitle,html[lang="en"] .cover-subtitle { font-size:11px; }
  .cover-content h1 { font-size:clamp(112px,20vw,170px); }
  .cover-description { font-size:17px; }
  .cover-signature { font-size:10px; }
  .cover-spine { font-size:8px; }
  .book-page { min-width:0; min-height:0; }
  .book-illustration { height:clamp(230px,34vh,420px); height:clamp(230px,34svh,420px); min-height:0; }
  .book-illustration>img { object-position:50% 44%; }
  .illustration-caption { left:25px; right:25px; bottom:62px; }
  .illustration-caption>span { font-size:10px; }
  .illustration-caption>p,html[lang="en"] .illustration-caption>p { font-size:clamp(28px,4vw,44px); max-width:24ch; }
  .illustration-quote { font-size:clamp(20px,3.3vw,34px); max-width:29ch; line-height:1.6; }
  .illustration-caption cite { font-size:10px; margin-top:10px; }
  .book-illustration figcaption { left:25px; right:25px; bottom:16px; font-size:9px; line-height:1.7; }
  .image-folio { display:none; }
  .book-prose,.book-frontispiece,.ending-dedication { height:auto; max-height:none; min-height:0; overflow:visible; overscroll-behavior:auto; padding:28px clamp(23px,4.5vw,68px) 30px; }
  .book-prose { border-radius:0 0 5px 5px; }
  .page-running-head { font-size:10px; line-height:1.8; letter-spacing:.4px; }
  .page-scene-label { font-size:11px; letter-spacing:.5px; margin-top:25px; }
  .page-story-text { font-size:clamp(18px,2.2vw,21px); line-height:1.95; max-inline-size:65ch; }
  .book-prose h2 { font-size:clamp(30px,4.2vw,44px); line-height:1.45; margin-bottom:23px; }
  .paper-wonder { font-size:16px; line-height:1.9; }
  .paper-footer { font-size:10px; }
  .book-prose>.text-button { font-size:14px; }
  .book-frontispiece>.paper-folio,.ending-dedication>.paper-folio { display:none; }
  .dedication { font-size:clamp(29px,4.2vw,44px); }
  .frontispiece-content>p:not(.dedication),.ending-intro,.ending-quote>p { font-size:18px; line-height:1.95; }
  .contents-page { border-top:1px solid var(--paper-line); }
  .contents-page h2 { font-size:36px; }
  .paper-contents>a { font-size:18px; gap:14px; padding-block:18px; min-height:68px; }
  .contents-number { font-size:30px; }
  .contents-dots,.contents-folio { display:none; }
  .contents-note { font-size:16px; }
  .paper-link { font-size:15px; }
  .ending-dedication { padding-bottom:20px; }
  .ending-quote { padding-block:30px; }
  .ending-quote blockquote { font-size:clamp(28px,3.8vw,42px); }
  .ending-page { border-top:1px solid var(--paper-line); }
  .paper-action { font-size:17px; }
  .book-reader .book-navigation { position:fixed; z-index:35; bottom:0; left:0; right:0; width:100%; max-width:none; min-height:82px; grid-template-columns:minmax(0,1fr) auto minmax(0,1fr); gap:8px; margin:0; padding:8px max(10px,env(safe-area-inset-right)) calc(8px + env(safe-area-inset-bottom)) max(10px,env(safe-area-inset-left)); border-top:1px solid #f2c4a72e; background:rgba(33,28,35,.97); }
  .book-position { width:clamp(104px,30vw,240px); }
  .book-position>p { font-size:17px; }
  .book-position>span { font-size:10px; max-width:none; line-height:1.6; }
  .book-progress-track { margin-top:5px; max-width:130px; }
  .page-nav-button { min-height:48px; font-size:12px; padding:5px 2px; gap:7px; white-space:normal; }
  .next-page-button { text-align:right; }
  .page-nav-button .icon { width:19px; height:19px; }
  .book-reading-hint { display:none; }
  .page-turn { display:none; }
  .site-footer { padding:25px max(20px,env(safe-area-inset-left)); flex-wrap:wrap; gap:22px; }
  .site-footer p { order:3; flex-basis:100%; }
  .toast { bottom:calc(100px + env(safe-area-inset-bottom)); }
  dialog { max-height:calc(100vh - 24px); max-height:calc(100dvh - 24px); width:min(760px,calc(100vw - 24px)); }
  .appendix-timeline li { flex-wrap:wrap; gap:6px 20px; }
  .appendix-timeline time { font-size:13px; }
}
@media screen and (max-width:380px) {
  .site-header { padding-inline:max(12px,env(safe-area-inset-left)); }
  .header-nav .language-switch { right:max(12px,env(safe-area-inset-right)); }
  .wordmark { font-size:16px; gap:7px; }
  .team-logo { width:39px; height:27px; }
  .header-nav { gap:4px; }
  .listen-button,.voice-settings-button,.chapter-toggle { font-size:12px; padding-inline:9px; }
  .book-position { width:104px; }
  .book-position>span { font-size:9px; }
  .page-nav-button { font-size:11px; gap:5px; }
  .cover-content { padding-inline:33px 25px; min-height:580px; }
  .book-reader .book-cover .cover-series { font-size:9px!important; }
  .book-prose { padding-inline:22px; }
  .page-story-text { font-size:18px; }
  .page-running-head { font-size:9px; }
  .lab-tabs button { font-size:12px; }
  .voice-dialog .slider-label { flex-wrap:wrap; gap:6px; }
}
@media screen {
  .site-header { padding-top:env(safe-area-inset-top); }
  .language-switch button { min-width:40px; min-height:40px; }
}
@media screen and (max-width:900px), screen and (max-width:1180px) and (orientation:portrait), screen and (max-height:520px) and (pointer:coarse) {
  html { scroll-padding-top:calc(128px + env(safe-area-inset-top)); }
  .site-header { padding-top:calc(8px + env(safe-area-inset-top)); }
  .header-nav .language-switch { top:calc(10px + env(safe-area-inset-top)); }
  #chapter-1 .book-illustration { height:clamp(300px,38vh,460px); height:clamp(300px,38svh,460px); }
}
@media screen {
  .book-reading-hint { font-size:12px; line-height:1.5; margin-top:6px; }
  .book-reading-hint>span { display:none; }
}
@media screen and (max-width:900px), screen and (max-width:1180px) and (orientation:portrait), screen and (max-height:520px) and (pointer:coarse) {
  body.book-edition { padding-bottom:calc(140px + env(safe-area-inset-bottom)); }
  .toast { bottom:calc(140px + env(safe-area-inset-bottom)); }
}
/* The title cover uses the same full width as the open book. */
@media screen {
  .book-reader .book-spread.is-cover,.book-reader .book-cover { width:100%; max-width:none; }
  .book-reader .cover-content { display:grid; grid-template-columns:minmax(0,1.25fr) minmax(260px,.75fr); grid-template-rows:auto auto 1fr auto; align-items:center; justify-items:start; text-align:left; min-height:calc(100vh - 238px); min-height:calc(100dvh - 238px); padding:clamp(30px,3.5vw,70px) clamp(40px,4.5vw,110px); gap:16px 6vw; }
  .cover-series { grid-column:1/-1; grid-row:1; }
  .cover-ornament { display:none; }
  .cover-subtitle { grid-column:1; grid-row:2; }
  .book-reader .cover-content h1 { grid-column:1; grid-row:3; margin:0; font-size:clamp(145px,13vw,300px); line-height:.9; letter-spacing:-.025em; }
  .book-reader .cover-description { grid-column:2; grid-row:3; align-self:center; margin:0 0 70px; font-size:clamp(20px,1.5vw,30px); line-height:1.8; max-width:25ch; }
  .book-reader .cover-open { grid-column:2; grid-row:3; align-self:end; margin:0; min-height:54px; font-size:17px; padding:14px 25px; }
  .book-reader .cover-signature { grid-column:2; grid-row:4; margin:0; padding-top:16px; font-size:12px; }
  .cover-art { object-position:center 38%; }
  .cover-shade { background:linear-gradient(90deg,#2c202bd9,#39253060 54%,#30202b96),linear-gradient(0deg,#2c1d27bf,transparent 70%); }
  .book-reader .book-cover .cover-series { font-size:13px!important; }
  .cover-frame { inset:20px 23px 20px 34px; }
}
@media screen and (max-width:900px), screen and (max-width:1180px) and (orientation:portrait), screen and (max-height:520px) and (pointer:coarse) {
  .book-reader .cover-content { display:flex; flex-direction:column; align-items:center; justify-content:center; text-align:center; min-height:calc(100svh - 230px); padding:32px clamp(25px,4vw,48px) 30px 33px; gap:0; }
  .book-reader .book-cover .cover-series { font-size:11px!important; max-width:40ch; }
  .cover-subtitle { margin-top:23px; }
  .book-reader .cover-content h1 { font-size:clamp(92px,29vw,240px); margin-top:22px; line-height:.94; }
  .book-reader .cover-description { font-size:clamp(18px,2.5vw,25px); margin:24px 0 0; }
  .book-reader .cover-open { align-self:center; margin-top:26px; min-height:52px; font-size:16px; }
  .book-reader .cover-signature { margin-top:28px; padding:0; font-size:11px; }
}