@font-face{font-family:ManualHand;src:url('./assets/fonts/caveat-latin.woff2') format('woff2');font-weight:400 700;font-display:swap}
:root{color-scheme:light;--paper:#f3f2e9;--white:#faf9f1;--ink:#292b25;--muted:#676b5f;--line:#cecec0;--soft:#e8e9dc;--accent:#bff55c;--accent-ink:#22261b;--control-line:#858b7c;--hover:#e7e9db;--code:#eeeee3;--strong-line:#a9af9b;--art-filter:none;--texture-opacity:.38;--switch-bg:#dce9be;--tech:#bff55c}
html[data-theme=dark]{color-scheme:dark;--paper:#111111;--white:#1b1b1b;--ink:#e7e7e7;--muted:#aaaaaa;--line:#383838;--soft:#282828;--accent:#bff55c;--accent-ink:#202020;--control-line:#777777;--hover:#2b2b2b;--code:#282828;--strong-line:#666666;--art-filter:grayscale(.65) brightness(.63) contrast(1.2);--texture-opacity:0;--switch-bg:#333333;--tech:#dddddd}
body{position:relative;background:var(--paper);isolation:isolate}body:before{content:'';position:fixed;inset:0;z-index:-1;pointer-events:none;background:url('./assets/manual-paper.webp') repeat;background-size:620px;opacity:var(--texture-opacity)}
.theme-transition body,.theme-transition .site-header,.theme-transition .answer,.theme-transition nav>a,.theme-transition .search-form,.theme-transition .specimen-image,.theme-transition .specimen-stage{transition:background-color .42s ease,color .42s ease,border-color .42s ease,filter .42s ease}
.site-header{position:sticky;top:0;z-index:5;max-width:none;height:96px;background:var(--paper);padding:0 max(40px,calc((100vw - 1280px)/2));gap:28px;border-color:var(--line)}
.brand-mark{width:38px;height:43px}.brand-words img{width:133px}.brand-words>span{font-size:9px}.header-divider{border-color:var(--line)}.manual-identity{display:flex;flex-direction:column;gap:3px}.manual-identity strong{font-size:16px;font-weight:500;letter-spacing:.03em}.manual-identity>span{font-size:10px;color:var(--muted);white-space:nowrap}.header-actions{margin-left:auto;display:flex;align-items:center;gap:28px}.header-link{font-size:12px;margin:0;gap:12px}.light-switch{display:flex;align-items:center;gap:12px;min-height:48px;padding:7px 11px;border:1px solid var(--control-line);border-radius:9px;background:var(--white)}.light-switch:hover{background:var(--hover)}.switch-words{display:flex;align-items:flex-start;flex-direction:column;gap:1px;min-width:49px}.theme-label{font-size:12px;font-weight:500}.theme-current{font-size:9px;color:var(--muted)}.led-icon{fill:currentColor;stroke:none;width:23px;height:29px;flex-shrink:0}.switch-track{display:block;position:relative;width:29px;height:17px;border:1px solid var(--control-line);border-radius:10px;background:var(--switch-bg)}.switch-track>span{position:absolute;width:9px;height:9px;top:3px;left:15px;border-radius:50%;background:var(--ink);transform:translateX(-2px);transition:transform .25s ease}.light-switch[data-light-on=false] .switch-track>span{transform:translateX(-11px)}
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.specimen-scene{margin:0;align-self:stretch;display:flex;flex-direction:column;justify-content:center;min-width:0}.specimen-stage{height:370px;position:relative;isolation:isolate;overflow:hidden;border-radius:48% 48% 10px 10px}.specimen-image{position:absolute;width:100%;height:100%;object-fit:cover;object-position:center;mix-blend-mode:multiply;filter:var(--art-filter);z-index:-1}.specimen-coordinate{position:absolute;left:18px;top:30px;font-size:10px;line-height:1.8;letter-spacing:.15em;color:var(--muted);z-index:2}.specimen-coordinate>span{font-size:7px;letter-spacing:.05em}.scene-symbol{position:absolute;right:26px;bottom:26px;width:33px;height:33px;color:var(--ink)}.scene-symbol .led-icon{width:33px;height:33px}.cursor-dots{display:none}.specimen-corner{position:absolute;width:28px;height:28px;z-index:2;opacity:.65}.corner-a{left:0;bottom:0;border-left:1px solid var(--strong-line);border-bottom:1px solid var(--strong-line)}.corner-b{right:0;top:0;border-top:1px solid var(--strong-line);border-right:1px solid var(--strong-line)}figcaption{display:flex;align-items:center;justify-content:space-between;margin:14px 4px 0;font-size:12px;color:var(--muted)}.scene-index{font:21px/1 ManualHand,cursive;letter-spacing:.06em}.tech-caption{display:none}.instrument-rings{display:none;position:absolute;inset:0;pointer-events:none}.instrument-rings>span{position:absolute;border:1px solid #dddddd4a;width:270px;height:270px;border-radius:50%;top:50%;left:50%;transform:translate(-50%,-50%)}.instrument-rings>span:nth-child(2){width:310px;height:310px;border-style:dashed;border-color:#dddddd30}.instrument-rings>span:nth-child(3){width:350px;height:350px;border-color:#dddddd1c}.guide-meta{font-size:11px;border-color:var(--line);padding:17px 0}.meta-slash{margin:0 12px;color:var(--strong-line)}
.rail-note>.led-icon{width:29px;height:29px;margin-bottom:11px}.rail-note>a,.answer a,.empty-state>a,footer a{border-color:var(--strong-line)}.reading-toolbar button{background:var(--soft)}.reading-toolbar button:hover,.empty-state button{background:var(--accent);color:var(--accent-ink)}nav>a:hover{background:var(--hover)}nav>a[aria-current=true]{background:var(--accent);color:var(--accent-ink)}.nav-no,.nav-count{color:var(--muted)}nav>a[aria-current=true] .nav-no,nav>a[aria-current=true] .nav-count{color:var(--accent-ink)}.question-list,.chapter-next{border-color:var(--strong-line)}.answer blockquote,.answer pre,.answer p>code,.answer th{background:var(--code)}.answer a:hover{background:var(--accent);color:var(--accent-ink)}.answer-actions>a:hover{background:none;color:var(--ink)}.answer{box-shadow:0 4px 13px #41463008}.search-excerpt mark{background:var(--accent);color:var(--accent-ink)}.empty-state button{color:var(--accent-ink)}.skip-link{color:var(--accent-ink)}
.plus{width:20px;height:20px;display:flex;align-items:center;justify-content:center}.plus:before,.plus:after{display:none}.plus .led-icon{width:20px;height:20px;stroke:none;fill:currentColor}.matrix-minus{display:none}details[open] .matrix-plus{display:none}details[open] .matrix-minus{display:block}.plus{color:var(--muted)}details[open] .plus{color:var(--ink)}
html[data-theme=dark] .brand img{filter:invert(1)}html[data-theme=dark] .specimen-stage{border-radius:12px;background:#181818}html[data-theme=dark] .specimen-image{mix-blend-mode:luminosity;opacity:.76}html[data-theme=dark] .instrument-rings{display:block}html[data-theme=dark] .scene-symbol{color:var(--accent)}html[data-theme=dark] .scene-symbol .sprout-dots{display:none}html[data-theme=dark] .cursor-dots{display:block}html[data-theme=dark] .nature-caption{display:none}html[data-theme=dark] .tech-caption{display:inline}html[data-theme=dark] .specimen-coordinate{color:#dcdcdc;background:#181818c9;padding:8px;top:16px;left:16px}html[data-theme=dark] .scene-index{font:13px/1.5 Manrope,sans-serif;letter-spacing:.13em;color:var(--tech)}html[data-theme=dark] .hero h1{font-weight:400}html[data-theme=dark] .lamp-dots{color:var(--accent)}html[data-theme=dark] .part-index{color:var(--tech);letter-spacing:.2em}html[data-theme=dark] .answer{box-shadow:none}html[data-theme=dark] .answer h4{color:var(--tech)}html[data-theme=dark] .plus{color:var(--accent)}html[data-theme=dark] .rail-note>.led-icon{color:var(--accent)}html[data-theme=dark] .toast{background:var(--accent);color:var(--accent-ink)}html[data-theme=dark] .light-switch:hover{border-color:var(--tech)}html[data-theme=dark] .header-link:hover{border-color:var(--ink)}html[data-theme=dark] .question-no{font-variant-numeric:tabular-nums}
@media(min-width:1500px){.hero{grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:85px;padding:40px 0 28px}.specimen-stage{height:395px}}
@media(max-width:1380px){main,footer{margin-left:40px;margin-right:40px}.site-header{padding:0 40px;gap:20px}.hero{gap:40px}.hero h1{font-size:46px}.hero-copy>.machine-english{font-size:17px}.hero-narrative{gap:22px}.header-actions{gap:20px}}
@media(max-width:1050px){.site-header{padding:0 28px;gap:18px}.brand-words img{width:114px}.manual-identity strong{font-size:14px}.manual-identity>span{font-size:8px}.header-actions{gap:15px}.header-link{font-size:11px}.header-divider{display:none}main,footer{margin-left:28px;margin-right:28px}.hero{gap:28px;min-height:400px}.hero h1{font-size:40px}.hero-narrative{display:block}.hero-narrative>p{font-size:18px}.hero-narrative>span{display:none}.specimen-stage{height:320px}.hero-copy>.machine-english{font-size:14px;margin-bottom:18px}.quick-links{font-size:10px;gap:12px}.hero-narrative{margin-bottom:21px}.light-switch{gap:8px;padding:6px 9px}.theme-current{display:none}.switch-words{min-width:24px}.switch-track{display:none}}
@media(max-width:760px){html{scroll-padding-top:125px}.site-header{height:auto;min-height:103px;display:grid;grid-template-columns:1fr auto;gap:9px 12px;padding:13px 21px 12px}.brand{grid-column:1;grid-row:1;width:max-content;gap:8px}.brand-mark{width:25px;height:29px}.brand-words img{width:105px}.brand-words>span{font-size:7px;line-height:1}.manual-identity{grid-row:2;grid-column:1/-1;gap:0;display:flex;flex-direction:row;align-items:baseline;justify-content:space-between}.manual-identity strong{font-size:12px;letter-spacing:0}.manual-identity>span{font-size:7px}.header-actions{grid-row:1;grid-column:2;gap:12px}.light-switch{min-height:39px;padding:5px 9px;gap:7px;border-radius:7px}.lamp-dots{width:16px;height:22px}.theme-label{font-size:11px}.header-link{font-size:0;gap:0}.header-link svg{width:19px;height:19px}.hero{position:relative;grid-template-columns:1fr;padding:32px 0 22px;min-height:0;gap:21px}.hero h1{font-size:37px;letter-spacing:-.04em;margin-bottom:7px}.hero-copy>.machine-english{font-size:14px;max-width:none;margin-bottom:20px}.hero-narrative{position:relative;margin-bottom:24px;z-index:1}.hero-narrative>p{font-size:17px}.hero-narrative>span{display:none}.hero-copy{position:relative;z-index:1}.specimen-scene{position:relative;width:100%;margin:0;display:flex}.specimen-stage{height:195px;border-radius:50% 50% 4px 4px}.specimen-image{object-position:50% 57%}.specimen-coordinate{font-size:8px;top:23px;left:8px}.specimen-coordinate>span{font-size:6px}.scene-symbol{bottom:17px;right:18px}.scene-symbol .led-icon{width:25px;height:25px}.specimen-corner{width:18px;height:18px}figcaption{font-size:10px;margin-top:10px}.scene-index{font-size:18px}.instrument-rings>span{width:150px;height:150px}.instrument-rings>span:nth-child(2){width:177px;height:177px}.instrument-rings>span:nth-child(3){width:205px;height:205px}main,footer{margin-left:21px;margin-right:21px}.guide-meta{font-size:9px;gap:10px;padding:12px 0}.guide-meta>span:first-child{display:none}.meta-dot{margin:0 5px}.quick-links{font-size:10px;gap:12px}.search-form{height:53px}.search-form input{font-size:12px}.reading-layout{padding-top:21px}nav>a{background:var(--soft)}nav{scrollbar-color:var(--strong-line) transparent}.faq-section,.faq-item{scroll-margin-top:125px}.footer-manual{display:none}.chapter-rail{scroll-margin-top:125px}.section-heading h2{font-size:23px}}
@media(max-width:360px){.manual-identity{align-items:flex-start;flex-direction:column;gap:1px}.site-header{padding-left:17px;padding-right:17px}.header-actions{gap:10px}main,footer{margin-left:17px;margin-right:17px}.hero h1{font-size:33px}.hero-copy>.machine-english{font-size:12px}.quick-links{gap:9px;font-size:9px}.section-heading h2{font-size:21px}.search-form input{font-size:11px}}
@media(prefers-reduced-motion:reduce){.theme-transition body,.theme-transition .site-header,.theme-transition .answer,.theme-transition nav>a,.theme-transition .search-form,.theme-transition .specimen-image,.theme-transition .specimen-stage,.switch-track>span{transition:none!important}}
.chapter-rail{top:122px}.specimen-coordinate{display:none}html[data-theme=dark] .specimen-coordinate{display:block}
@media(max-width:760px){.manual-identity{flex-direction:column;align-items:flex-start;gap:2px}.manual-identity strong{font-size:13px}.manual-identity>span{font-size:9px}.site-header{min-height:118px}.faq-section,.faq-item{scroll-margin-top:18px}.chapter-rail{position:static}}
.specimen-image-dark{display:none}html[data-theme=dark] .specimen-image{display:none}html[data-theme=dark] .specimen-image-dark{display:block;filter:grayscale(1);mix-blend-mode:normal;opacity:1}html[data-theme=dark] .specimen-stage{background:var(--paper)}html[data-theme=dark] .instrument-rings{opacity:.3}
@media(max-width:760px){.header-link{font-size:11px;gap:5px}.header-link svg{width:14px;height:14px}.manual-identity>span{font-size:10px}.header-actions{gap:12px}}.contact-short{display:none}@media(max-width:760px){.contact-wide{display:none}.contact-short{display:inline}}

/* Neutral lights-out, tactile slider on every viewport, user-controlled BGM. */
.light-switch{touch-action:pan-y;user-select:none}.header-actions{gap:18px}
.audio-toggle{display:flex;align-items:center;gap:9px;padding:9px 11px;min-height:48px;border:1px solid var(--control-line);border-radius:9px;background:var(--white);position:relative}.audio-toggle:hover{background:var(--hover)}.audio-label{font-size:11px;white-space:nowrap}.music-dots{width:22px;height:22px}.audio-state-dot{width:5px;height:5px;border-radius:50%;background:var(--muted)}.audio-toggle[data-audio-state=playing] .audio-state-dot{background:var(--accent);outline:1px solid var(--ink)}.audio-toggle[data-audio-state=playing] .music-dots{color:var(--ink)}html[data-theme=dark] .audio-toggle[data-audio-state=playing] .music-dots{color:var(--accent)}.audio-toggle[data-audio-state=loading]{opacity:.65}.audio-toggle[data-audio-state=error]{border-style:dashed}
@media(max-width:1150px){.audio-label{display:none}.audio-toggle{padding:9px}.header-actions{gap:12px}.audio-state-dot{position:absolute;right:5px;bottom:5px}}
@media(max-width:1050px){.switch-track{display:block}.switch-words{display:none}}
@media(max-width:760px){.brand-words img{width:90px}.brand-mark{width:23px;height:28px}.brand{gap:7px}.header-actions{gap:8px}.light-switch{padding:4px;min-width:52px;min-height:40px;border:0;background:transparent;border-radius:20px}.light-switch>.lamp-dots,.light-switch>.switch-words{display:none}.light-switch:hover{background:transparent}.switch-track{display:block;width:44px;height:26px;border-radius:15px;background:var(--accent);border-color:var(--strong-line)}.switch-track>span{width:18px;height:18px;left:20px;top:3px;background:#292929;transform:translateX(0)}.light-switch[data-light-on=false] .switch-track{background:#333;border-color:#777}.light-switch[data-light-on=false] .switch-track>span{background:#e7e7e7;transform:translateX(-17px)}.audio-toggle{width:35px;height:38px;min-height:38px;padding:6px;border-radius:8px}.music-dots{width:21px;height:21px}.header-link{gap:3px;font-size:10px}.header-link svg{width:12px;height:12px}}
/* Compact controls: lights-out owns the accent, light mode stays quiet. */
.header-actions{gap:14px}.light-switch,.audio-toggle{height:32px;min-height:32px;padding:4px 6px;border:0;border-radius:5px;background:transparent}.light-switch{min-width:40px;gap:7px}.light-switch:hover,.audio-toggle:hover{background:var(--hover)}.light-switch>.lamp-dots,.switch-words,.audio-label{display:none}.switch-track{display:block;width:30px;height:18px;border:1px solid var(--control-line);border-radius:12px;background:#d0d0c5}.switch-track>span{width:12px;height:12px;left:14px;top:2px;background:#484848;transform:translateX(0)}.light-switch[data-light-on=false] .switch-track{background:var(--accent);border-color:var(--accent)}.light-switch[data-light-on=false] .switch-track>span{background:#252525;transform:translateX(-12px)}.audio-toggle{width:28px;justify-content:center;gap:0}.audio-toggle svg{width:16px;height:16px;stroke:currentColor;stroke-width:1.6}.audio-play-icon{fill:currentColor}.audio-pause-icon{display:none;stroke-width:3!important}.audio-toggle[data-audio-state=playing] .audio-play-icon,.audio-toggle[data-audio-state=loading] .audio-play-icon{display:none}.audio-toggle[data-audio-state=playing] .audio-pause-icon,.audio-toggle[data-audio-state=loading] .audio-pause-icon{display:block}.audio-toggle[data-audio-state=playing]{color:var(--ink)}html[data-theme=dark] .audio-toggle[data-audio-state=playing]{color:var(--accent)}
html[data-theme=dark] .hero-copy>.machine-english{color:var(--accent)}
html[data-theme=dark] .search-form:focus-within{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}
html[data-theme=dark] .search-form:focus-within>svg{color:var(--accent)}
html[data-theme=dark] .search-form input{caret-color:var(--accent)}
html[data-theme=dark] .quick-links>a:hover,html[data-theme=dark] .quick-links>a:focus-visible,html[data-theme=dark] .header-link:hover{color:var(--accent);background:transparent;border-color:var(--accent)}
html[data-theme=dark] .tech-caption,html[data-theme=dark] .scene-index,html[data-theme=dark] .part-index{color:var(--accent)}
html[data-theme=dark] .specimen-coordinate{color:var(--accent)}
html[data-theme=dark] .instrument-rings{opacity:.65}html[data-theme=dark] .instrument-rings>span{border-color:#bff55c40}html[data-theme=dark] .instrument-rings>span:nth-child(2){border-color:#bff55c26}html[data-theme=dark] .instrument-rings>span:nth-child(3){border-color:#bff55c18}
html[data-theme=dark] .specimen-corner{border-color:var(--accent)}
@media(max-width:760px){.header-actions{gap:9px}.light-switch{height:30px;min-height:30px;min-width:38px;padding:4px}.audio-toggle{width:25px;height:30px;min-height:30px;padding:4px}.header-link{font-size:11px}.audio-toggle svg{width:15px;height:15px}}