/* Shared learning layers; native details keep content readable without JS. */
:root{--learn-ink:#163454;--learn-blue:#145da0;--learn-line:#cddbea;--learn-soft:#f2f7fc}
html{scroll-padding-top:88px}
body{background:#fff}
.site-modes,.flow-rail,.learning-depth-nav,.learning-next{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.site-modes{border-bottom:1px solid var(--learn-line);padding:12px 0;margin-bottom:12px}
.site-modes a{font-size:15px;font-weight:750;padding:7px 13px;border-radius:5px;text-decoration:none}
.site-modes [aria-current]{background:var(--learn-ink);color:#fff}
.flow-rail{gap:4px;font-size:13px;color:#4c6276}
.flow-rail a{padding:7px 9px;border-radius:4px;text-decoration:none}
.flow-rail [aria-current]{background:#e3effa;color:#133e68;font-weight:800}
.learning-location{font-size:13px;color:#526a82;margin:12px 0 20px}
.learning-intro{padding:8px 0 25px;max-width:850px}
.learning-intro h1{font-size:clamp(27px,4.7vw,39px);line-height:1.35;color:var(--learn-ink);letter-spacing:-.025em;margin:0 0 16px}
.learning-depth{font-size:14px;color:var(--learn-blue);font-weight:750;margin:0 0 8px}
.learning-lead{font-size:19px;line-height:1.7;margin:0 0 15px;color:#314c65}
.learning-points{line-height:1.85;padding-left:1.3em;margin:0 0 20px}
.learning-actions{display:flex;flex-wrap:wrap;gap:9px}
.learning-action{display:flex;align-items:center;justify-content:space-between;gap:20px;background:var(--learn-ink);color:white!important;padding:12px 16px;min-height:44px;border-radius:6px;font-weight:700;text-decoration:none!important}
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.learning-depth-nav a{padding:6px 10px;font-size:14px;text-decoration:none}
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#technical{padding:24px 0;border-top:2px solid var(--learn-line)}
#technical>p{font-size:14px;color:#526579}
.learning-chain{display:flex;list-style:none;padding:0;gap:9px;flex-wrap:wrap;counter-reset:step}
.learning-chain li{padding:12px;border-left:3px solid var(--learn-blue);background:var(--learn-soft);flex:1 1 115px;font-weight:700;line-height:1.6}
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.learning-next a{padding:10px;font-size:14px}
.skip-link{position:absolute;left:-10000px}
.skip-link:focus{position:fixed;left:12px;top:12px;z-index:9999;padding:12px;background:white}
.source-sequence{padding-left:22px}.source-sequence .hub-card{margin-bottom:10px}
.legacy-link,.how-moved,.sv-moved{font-size:14px}
[data-training-page] .footnav{display:none}
[data-training-page] .technical-details h1{font-size:24px}
[data-training-page] .technical-details .hero{padding:15px}
.technical-details .tw,.technical-details .ts-table-scroll{max-width:100%;overflow:auto}
[data-training-page] th{white-space:normal}
[data-training-page] .technical-details img{max-width:100%}
[data-training-page="check"] .sticky-action{position:static;font-size:16px}
[data-training-page="aph"] .aph-entries{grid-template-columns:repeat(2,minmax(0,1fr))}
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@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{.site-modes,.flow-rail,.learning-depth-nav,.learning-next,.skip-link{display:none}details::details-content{content-visibility:visible!important;height:auto!important}details>*{display:block!important}}
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[data-page-mode="field"] .learning-location{margin:5px 0 10px}
[data-page-mode="field"] .learning-intro{padding:0 0 12px}
[data-page-mode="field"] .learning-intro h1{font-size:27px;margin-bottom:9px}
[data-page-mode="field"] .learning-lead{font-size:16px;line-height:1.6;margin-bottom:10px}
[data-page-mode="field"] .learning-action{flex:0 1 auto;padding:7px 10px;font-size:14px;background:var(--learn-soft);color:var(--learn-ink)!important;border:1px solid var(--learn-line)}
[data-page-mode="field"] .learning-depth-nav{margin-bottom:16px;padding:8px 0}
[data-page-mode="field"] .learning-depth-nav a{font-size:13px;padding:4px}
[data-page-mode="field"] #field{margin-top:15px}
[data-lesson-panel][hidden]{display:none!important}

.topbar .topbar-title{margin:0;font-size:19px;font-weight:700;letter-spacing:.01em}
/* Safety-valve pilot: stable topic navigation and visible reference material. */
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.sv-topic-header{position:sticky;top:0;z-index:30;background:#fff;border-bottom:1px solid #ccd8df;padding:16px 0 0}
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.sv-chapters a[aria-current]{color:#12587b;border-color:#12587b;background:#edf5f8}.sv-chapters a:hover{background:#f0f5f7}
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@media(max-width:650px){:is(.sv-pilot,.topic-page){padding:0 16px 30px}.sv-topic-header{padding-top:10px}.sv-topic-top{margin-bottom:6px}.sv-topic-top strong{font-size:20px}.sv-chapters{gap:0}.sv-chapters a{flex:1;padding:11px 3px;text-align:center;font-size:13px;white-space:nowrap}.sv-page-intro{padding:23px 0}.sv-page-intro>p:last-of-type{font-size:16px}.sv-timing-flow{grid-template-columns:1fr}.sv-time-bridge{flex-direction:row;min-height:54px}.sv-time-bridge span:last-child{transform:rotate(90deg)}.sv-timing-flow article{padding:20px}.sv-check-grid{grid-template-columns:1fr}.sv-check-grid article{padding:17px 4px}.sv-check-grid article+article{border-left:0;border-top:1px solid #d4dfe4}.sv-source-strip{display:block;padding:13px}.sv-source-strip b{display:block;margin-bottom:5px}.sv-process-row{grid-template-columns:38px minmax(0,1fr);gap:12px;padding-bottom:24px}.sv-step-number{width:36px;height:36px;font-size:14px}.sv-process-row:not(:last-child):before{left:17px;top:36px}.sv-process-row h3{font-size:19px;margin-top:3px}.sv-process-row aside{grid-column:2;padding:12px}.sv-reference th,.sv-reference td{padding:12px;font-size:14px}.sv-reference tbody th{min-width:84px}.sv-order-options{grid-template-columns:1fr;padding:28px 0 20px;gap:12px}.sv-order-options:before{left:50%}.sv-order-options:after{display:none}.sv-course-footer{align-items:flex-start}.sv-course-footer a{font-size:15px;padding:12px}.sv-open-section>h2{font-size:23px!important}}

html:has(:is(.sv-pilot,.topic-page)){scroll-padding-top:calc(var(--topic-header-height,125px) + var(--topic-tabs-height,0px) + 16px)}

/* Safety-valve chapters share the same lesson surface and source archive. */
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:is(.sv-pilot,.topic-page) .sv-record-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
:is(.sv-pilot,.topic-page) .sv-record-grid article{padding:18px 22px;background:#f3f6f7;border-top:3px solid #7296a8}
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:is(.sv-pilot,.topic-page) .sv-record-grid li,:is(.sv-pilot,.topic-page) .sv-check-grid li{line-height:1.8;margin:7px 0}
:is(.sv-pilot,.topic-page) .sv-check-grid ul{padding-left:20px}
:is(.sv-pilot,.topic-page) .v8-boiler,:is(.sv-pilot,.topic-page) .sv-simbox{box-shadow:none;border:1px solid #ccd8df;border-radius:4px;background:#fff}
:is(.sv-pilot,.topic-page) .sv-conv{border-radius:4px;box-shadow:none}
:is(.sv-pilot,.topic-page) #technical .sv-reference{min-width:0}
:is(.sv-pilot,.topic-page) #technical td{overflow-wrap:anywhere}
:is(.sv-pilot,.topic-page) .sv-lesson-content>.lead,:is(.sv-pilot,.topic-page) .sv-lesson-content>.v8-warn{max-width:920px}
@media(max-width:650px){:is(.sv-pilot,.topic-page) .sv-record-grid{grid-template-columns:1fr;gap:14px}:is(.sv-pilot,.topic-page) .sv-record-grid article{padding:16px}:is(.sv-pilot,.topic-page) .sv-reference th{white-space:normal!important}}

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:is(.sv-pilot,.topic-page) .aph-slider input[type="range"]{min-height:48px}
@media(max-width:650px){:is(.sv-pilot,.topic-page) .v8-boiler{padding:12px}:is(.sv-pilot,.topic-page) .v8-model-grid{min-width:0}}

:is(.sv-pilot,.topic-page) .sv-reference td ul{margin:0;padding-left:18px}:is(.sv-pilot,.topic-page) .sv-reference td li+li{margin-top:8px}

/* Site-wide lesson system: original home catalogue, fixed topics, quiet content. */
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.topic-page .topic-home-links{display:flex;gap:18px;font-size:14px}.topic-home-links a{color:#496677;text-decoration:none;min-height:44px;display:flex;align-items:center}
.topic-page .topic-home-return{color:#31566b;background:transparent;border:1px solid #b8cbd5}
.topic-page .hub,.topic-page .hub-tools,.topic-page .menu,.topic-page .method-launcher,.topic-page .technical-directory{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:20px 0}
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.topic-page .hub-card:hover,.topic-page .menu>a:hover,.topic-page .method-launcher>a:hover{border-color:#205e7a;background:#f1f6f8;transform:none}
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.topic-page .method{margin:0}.topic-page .method-head{border-radius:4px;background:#f1f6f8}.topic-page .method-body{padding:20px}
.topic-page .steps{counter-reset:topic-step;list-style:none;padding-left:0}.topic-page .steps>li{counter-increment:topic-step;position:relative;padding:14px 14px 14px 58px;margin:0;border-left:2px solid #c2d4dd;line-height:1.8}.topic-page .steps>li:before{content:counter(topic-step);position:absolute;left:12px;top:16px;background:#205e7a;color:#fff;width:30px;height:30px;border-radius:50%;display:grid;place-items:center;font-weight:700}
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.topic-page .v8-boiler{max-width:100%}.topic-page .v8-model-main,.topic-page .v8-model-side{min-width:0}.topic-page .aph-slider input[type=range]{min-height:48px}
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.topic-page .v8-scope,.topic-page .gr-root{max-width:100%;margin:24px 0}.topic-page .sv-reference{min-width:0}
@media(max-width:650px){
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 .topic-page .sv-topic-top strong{font-size:20px}.topic-page .sv-page-intro h1{font-size:27px}
}

.topic-page .topic-tabs{position:sticky;top:var(--topic-header-height,125px);z-index:20;background:#fff;padding:10px 0;border-bottom:1px solid #d4dfe4}
.topic-page .topic-tabs[data-topic-switcher="methods"] button{flex-basis:95px}
@media(max-width:650px){.topic-page .topic-tabs[data-topic-switcher="methods"] button{flex:1 1 21%;font-size:13px;min-height:48px}.topic-page .topic-tabs{gap:5px}}

/* Photo subcategories use the same compact control treatment as the lessons. */
.topic-page .pw-tab{border-radius:4px;min-height:48px;border-color:#b8cbd5;color:#31566b;background:#f6f9fa}
.topic-page .pw-tab[aria-pressed="true"]{background:#205e7a;border-color:#205e7a;color:#fff}
.topic-page .pw-cell,.topic-page .pw-dlg{border-radius:6px;box-shadow:none}

/* Home: three entrances + overhaul map (3D boiler × stations × field photos). */
.topic-page .home-hero{padding:34px 0 26px;border-bottom:1px solid #ccd8df}
.home-eyebrow{margin:0 0 6px;font-size:15px;font-weight:700;color:#526d7e;letter-spacing:.04em}
.home-hero h1{font-size:clamp(32px,4.4vw,46px);line-height:1.25;margin:0 0 12px;letter-spacing:-.03em;color:#19354b}
.home-lead{font-size:19px;line-height:1.7;margin:0 0 22px;color:#314c65;max-width:860px}
.home-entries{display:grid;grid-template-columns:1.25fr 1fr 1fr;gap:14px}
.home-entry{display:flex;flex-direction:column;gap:6px;padding:18px 20px;border:1px solid #bdcdd6;border-radius:8px;background:#fff;color:#19354b;text-decoration:none;min-height:48px;position:relative}
.home-entry b{font-size:20px;line-height:1.4}.home-entry span{font-size:15px;line-height:1.65;color:#526d7e}
.home-entry:after{content:'→';position:absolute;right:18px;top:16px;font-size:20px;color:#688392}
.home-entry:hover{border-color:#205e7a;background:#f1f6f8}
.home-entry.is-primary{background:#205e7a;border-color:#205e7a;color:#fff}.home-entry.is-primary span{color:#dce9f0}.home-entry.is-primary:after{color:#fff}.home-entry.is-primary:hover{background:#18506a}
.home-sub{display:flex;flex-wrap:wrap;gap:12px 20px;align-items:center;margin-top:18px}
.home-tour{min-height:44px;padding:9px 16px;border:1px solid #205e7a;border-radius:6px;background:#fff;color:#205e7a;font:inherit;font-weight:700;cursor:pointer}
.home-tour:hover{background:#edf5f8}
.home-basis{flex:1 1 380px;margin:0;font-size:14px;line-height:1.7;color:#526d7e}.home-basis b{margin-right:10px;color:#19354b}
.om{margin:34px 0}.om-head h2{font-size:25px;margin:0 0 6px;color:#19354b}.om-head p{margin:0 0 16px;font-size:16px;line-height:1.7;color:#526d7e}
.om-rail{margin:0 0 16px}
.om-main{display:flex;list-style:none;margin:0;padding:0}
.om-main>li{flex:1 1 0;position:relative;min-width:0}
.om-main>li:not(:last-child):after{content:'';position:absolute;top:19px;left:calc(50% + 20px);right:calc(-50% + 20px);height:2px;background:#b9d0db}
.om-stop{display:flex;flex-direction:column;align-items:center;gap:6px;text-decoration:none;color:#3c5666;padding:0 2px 6px;min-height:48px;border-radius:6px}
.om-dot{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;border:2px solid #205e7a;background:#fff;color:#205e7a;font-weight:800;font-size:15px}
.om-name{font-size:14px;line-height:1.35;text-align:center;font-weight:650}
.om-stop:hover .om-dot{background:#edf5f8}
.om-stop[aria-current] .om-dot{background:#205e7a;color:#fff;box-shadow:0 0 0 4px #cfe3ec}
.om-stop[aria-current] .om-name{color:#12587b;font-weight:800}
.om-branch{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;margin-top:10px;padding:10px 14px;border:1px dashed #9bb7c5;border-radius:8px;background:#f7fafb}
.om-branch-label{font-size:13px;font-weight:700;color:#526d7e}
.om-branch-list{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0}
.om-stop.is-branch{flex-direction:row;padding:6px 12px 6px 6px;border:1px solid #b8cbd5;border-radius:22px;background:#fff;min-height:44px}
.om-stop.is-branch .om-dot{width:28px;height:28px;font-size:14px;border-width:1.5px}
.om-stop.is-branch[aria-current]{border-color:#205e7a;background:#edf5f8}
.om-grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:20px;align-items:start}
.om-stage{position:relative;aspect-ratio:4/3;border:1px solid #ccd8df;border-radius:8px;overflow:hidden;background:#eef3f6}
.om-stage canvas{display:block;width:100%;height:100%;touch-action:none}
.om-poster{position:absolute;inset:0;display:grid;place-items:end center;padding-bottom:22px}
.om-poster img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.om-load{position:relative;min-height:48px;padding:10px 20px;border:0;border-radius:6px;background:#205e7a;color:#fff;font:inherit;font-weight:700;cursor:pointer;box-shadow:0 2px 8px rgba(0,0,0,.18)}
.om-load:disabled{opacity:.7;cursor:progress}
[data-model-state="ready"] .om-poster{display:none}
.om-status{position:absolute;left:10px;top:10px;margin:0;max-width:calc(100% - 20px);padding:7px 11px;border-radius:6px;background:rgba(255,255,255,.94);font-size:14px;line-height:1.6;color:#3c5666;box-shadow:0 1px 4px rgba(0,0,0,.12)}
.om-picked{position:absolute;left:10px;bottom:40px;margin:0;max-width:calc(100% - 20px);padding:7px 11px;border-radius:6px;background:rgba(255,255,255,.96);font-size:14px;box-shadow:0 1px 4px rgba(0,0,0,.15)}
.om-card{padding:20px 22px;border:1px solid #ccd8df;border-top:4px solid #205e7a;border-radius:8px;background:#fff}
.om-when{margin:0 0 6px;font-size:14px;font-weight:700;color:#526d7e}
.om-title{display:flex;align-items:center;gap:10px;margin:0 0 10px;font-size:24px;line-height:1.35;color:#19354b}
.om-n{flex:0 0 auto;min-width:34px;height:34px;padding:0 8px;display:grid;place-items:center;border-radius:6px;background:#205e7a;color:#fff;font-size:16px}
.om-summary{margin:0 0 12px;font-size:17px;line-height:1.75;color:#314c65}
.om-points{margin:0 0 12px;padding:0;list-style:none}.om-points li{position:relative;padding:4px 0 4px 24px;font-size:16px;line-height:1.65}
.om-points li:before{content:'';position:absolute;left:4px;top:13px;width:9px;height:9px;border-radius:2px;background:#327b99}
.om-focus-note{margin:0 0 12px;padding:9px 12px;background:#f1f6f8;border-left:3px solid #7296a8;font-size:14px;line-height:1.65;color:#3c5666}
.om-photo{margin:0 0 14px}.om-photo img{display:block;width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:6px;background:#eef3f6}
.om-photo figcaption{margin-top:7px;font-size:14px;line-height:1.65;color:#526d7e}.om-photo-more{white-space:nowrap}
.om-actions{display:flex;flex-wrap:wrap;gap:8px}
.om-go,.om-tool{display:inline-flex;align-items:center;min-height:48px;padding:10px 16px;border-radius:6px;text-decoration:none;font-weight:700;line-height:1.4}
.om-go{background:#205e7a;color:#fff!important}.om-go:hover{background:#18506a}
.om-tool{border:1px solid #b8cbd5;background:#f7fafb;color:#245b76!important;font-weight:650}
.om-nav{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:12px}
.om-nav button{min-height:48px;padding:10px 16px;border:1px solid #b8cbd5;border-radius:6px;background:#fff;color:#205e7a;font:inherit;font-weight:700;cursor:pointer}
.om-nav button:disabled{opacity:.45;cursor:default}.om-nav span{font-size:14px;color:#526d7e;font-variant-numeric:tabular-nums}
.home-photos{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px;text-decoration:none;margin:14px 0}
.home-photos img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:6px;background:#eef3f6}
.home-photos-go{grid-column:1/-1;justify-self:end;font-weight:700;color:#205e7a;min-height:44px;display:flex;align-items:center}
.home-catalogue{border:1px solid #ccd8df;border-radius:8px;padding:0 18px}.home-catalogue>summary{font-weight:700;color:#31566b}
.home-library a{display:inline-flex;align-items:center;min-height:48px;padding:10px 16px;border-radius:6px;background:#edf5f8;border:1px solid #b8cbd5;font-weight:700;color:#205e7a;text-decoration:none}
@media(max-width:760px){
 .home-entries{grid-template-columns:1fr}.home-entry{padding:15px 16px}.home-entry b{font-size:18px}.home-lead{font-size:17px}
 .om-grid{grid-template-columns:1fr}
 .om-main{overflow-x:auto;padding-bottom:4px;scroll-snap-type:x proximity}
 .om-main>li{flex:0 0 78px;scroll-snap-align:start}
 .om-main>li:not(:last-child):after{left:calc(50% + 19px);right:calc(-50% + 19px)}
 .om-name{font-size:13px}.om-branch{padding:10px}
 .om-title{font-size:21px}.om-card{padding:16px}
 .home-photos{grid-template-columns:repeat(2,minmax(0,1fr))}
}
.om-main{position:relative}

/* 上課模式（講師導覽列）：固定在畫面底部，不遮住頁尾內容。 */
html.has-tour body{padding-bottom:76px}
.tour-bar{position:fixed;left:0;right:0;bottom:0;z-index:1000;display:flex;align-items:center;justify-content:space-between;gap:10px 16px;flex-wrap:wrap;padding:10px max(16px,calc((100vw - 1120px)/2));background:#19354b;color:#fff;box-shadow:0 -2px 12px rgba(0,0,0,.18)}
.tour-info{display:flex;align-items:center;gap:6px 14px;flex-wrap:wrap;min-width:0;flex:1 1 420px}
.tour-tag{padding:3px 9px;border-radius:4px;background:#edac38;color:#19354b;font-size:13px;font-weight:800}
.tour-count{font-size:14px;color:#c9dbe6;font-variant-numeric:tabular-nums}
.tour-title{font-size:17px;line-height:1.4}
.tour-slot,.tour-time{font-size:13px;color:#c9dbe6;font-variant-numeric:tabular-nums}
.tour-bar.is-late .tour-time{color:#ffd27a;font-weight:700}
.tour-ctl{display:flex;gap:8px;flex-wrap:wrap}
.tour-btn{min-height:44px;padding:8px 14px;border:1px solid #7f9db0;border-radius:6px;background:transparent;color:#fff;font:inherit;font-weight:700;cursor:pointer}
.tour-btn:hover{background:rgba(255,255,255,.1)}.tour-btn:disabled{opacity:.4;cursor:default}
.tour-btn.is-next{background:#fff;color:#19354b;border-color:#fff}.tour-btn.is-next:hover{background:#e3eef4}
.tour-btn.is-close{padding:8px 12px}
.tour-btn:focus-visible{outline:3px solid #edac38;outline-offset:2px}
.tour-panel{position:fixed;right:max(16px,calc((100vw - 1120px)/2));bottom:84px;z-index:1000;width:min(480px,calc(100vw - 32px));max-height:calc(100vh - 140px);overflow:auto;padding:16px 20px;background:#fff;border:1px solid #ccd8df;border-top:4px solid #edac38;border-radius:8px;box-shadow:0 8px 28px rgba(0,0,0,.2);color:#19354b}
.tour-panel-h{margin:0 0 8px;font-size:13px;font-weight:700;color:#526d7e}
.tour-panel ul{margin:0 0 12px;padding-left:20px}.tour-panel li{font-size:17px;line-height:1.7;margin:6px 0}
.tour-upnext{margin:0;padding-top:10px;border-top:1px solid #dce4e8;font-size:14px;color:#3c5666}
.tour-keys{margin:8px 0 0;font-size:12px;color:#7a8f9b}
@media(max-width:760px){html.has-tour body{padding-bottom:128px}.tour-info{flex-basis:100%}.tour-title{font-size:15px}.tour-ctl{width:100%}.tour-btn{flex:1 1 auto;padding:8px 6px;font-size:14px}.tour-panel{bottom:136px}}
@media print{.tour-bar,.tour-panel{display:none}}

/* 技術資料與校閱 */
.lib-principles{display:grid;grid-template-columns:repeat(3,1fr);border-block:1px solid #d4dfe4}
.lib-principles p{margin:0;padding:16px 18px;font-size:16px;line-height:1.75}.lib-principles p+p{border-left:1px solid #d4dfe4}
.lib-principles b{display:block;font-size:17px;margin-bottom:4px}
.lib-summary{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:6px 0 16px}
.lib-sum{display:inline-flex;align-items:baseline;gap:6px;min-height:44px;padding:8px 14px;border:1px solid #c5d4dc;border-radius:22px;background:#fff;font:inherit;color:#19354b;cursor:pointer}
.lib-sum b{font-size:20px;font-variant-numeric:tabular-nums}.lib-sum[aria-pressed="true"]{outline:3px solid #205e7a;outline-offset:1px}
.lib-sum-note{flex-basis:100%;font-size:13px;color:#526d7e}
.lib-filters{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:10px;margin:0 0 12px}
.lib-filters label{display:flex;flex-direction:column;gap:4px;font-size:13px;font-weight:700;color:#526d7e}
.lib-filters input,.lib-filters select,.lib-form input,.lib-form select,.lib-form textarea{min-height:44px;padding:8px 10px;border:1px solid #b8cbd5;border-radius:6px;font:inherit;font-size:16px;color:#19354b;background:#fff;box-sizing:border-box;width:100%}
.lib-review-bar{display:flex;flex-wrap:wrap;gap:8px 14px;align-items:center;margin:0 0 12px;padding:10px 0;border-block:1px solid #e1e8ec}
.lib-review-where{font-size:14px;color:#3c5666}.lib-review-tools{display:inline-flex;gap:8px;flex-wrap:wrap}
.lib-btn{display:inline-flex;align-items:center;min-height:44px;padding:8px 14px;border:1px solid #205e7a;border-radius:6px;background:#fff;color:#205e7a;font:inherit;font-weight:700;cursor:pointer}
.lib-btn[aria-pressed="true"],.lib-btn.is-primary{background:#205e7a;color:#fff}.lib-btn:disabled{opacity:.6}
.lib-count{font-size:14px;color:#526d7e;margin:0 0 10px}
.lib-list,.lib-sources{display:grid;gap:12px}
.lib-item,.lib-source{padding:16px 20px;border:1px solid #ccd8df;border-radius:8px;background:#fff}
.lib-item-head{display:flex;flex-wrap:wrap;gap:6px 8px;align-items:center;margin-bottom:6px}
.lib-chip{padding:2px 9px;border-radius:4px;background:#eef3f6;font-size:13px;font-weight:700;color:#31566b}
.lib-chip.is-P0{background:#ad4b22;color:#fff}.lib-chip.is-P1{background:#f3e3c6;color:#6a4a12}.lib-chip.is-P2{background:#e6ebee;color:#526d7e}
.lib-kind{font-size:13px;color:#526d7e}
.lib-state{margin-left:auto;padding:2px 10px;border-radius:12px;font-size:13px;font-weight:700;background:#e9eef2;color:#3c5666}
.lib-state.is-conflict{background:#fff1e3;color:#9a4a12}.lib-state.is-checked{background:#e3f1e6;color:#236137}.lib-state.is-done{background:#d5ecdc;color:#1c5230}
.lib-state.is-void,.lib-state.is-na{background:#eeeeee;color:#666}
.lib-title{margin:4px 0 6px;font-size:18px;line-height:1.55;color:#19354b}
.lib-owner{margin:0 0 6px;font-size:14px;color:#526d7e}
.lib-more>summary{min-height:44px;padding:8px 0!important;font-weight:700;color:#205e7a}
.lib-detail,.lib-how{white-space:pre-line;font-size:15px;line-height:1.75;margin:4px 0 8px}
.lib-src,.lib-id{font-size:13px;color:#526d7e;margin:2px 0;overflow-wrap:anywhere}
.lib-pages{display:flex;flex-wrap:wrap;gap:4px 10px;align-items:center;margin:6px 0 0;font-size:14px;color:#526d7e}
.lib-pages a{min-height:32px;display:inline-flex;align-items:center}
.lib-decision{display:grid;grid-template-columns:auto 1fr;gap:4px 12px;margin:10px 0 0;padding:10px 12px;background:#f3f7f5;border-left:3px solid #5a9a6e;font-size:14px}
.lib-decision dt{font-weight:700;color:#3c5666}.lib-decision dd{margin:0}
.lib-form{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:12px;padding:12px;border:1px dashed #9bb7c5;border-radius:8px;background:#f7fafb}
.lib-form label{display:flex;flex-direction:column;gap:4px;font-size:13px;font-weight:700;color:#3c5666}.lib-form .is-wide{grid-column:1/-1}
.lib-form-row{grid-column:1/-1;display:flex;gap:12px;align-items:center}.lib-form-msg{font-size:14px;color:#236137}
.lib-reports{margin:0 0 14px;padding:12px 16px;border:1px solid #edac38;border-radius:8px;background:#fffaf0}
.lib-reports h3{margin:0 0 6px;font-size:17px}.lib-reports li{margin:4px 0;line-height:1.6}
.lib-source-label{margin:4px 0;font-size:16px;line-height:1.6;font-weight:650}.lib-source-note{margin:4px 0;font-size:14px;line-height:1.7;color:#3c5666}
.lib-empty{color:#526d7e}
@media(max-width:760px){.lib-principles{grid-template-columns:1fr}.lib-principles p+p{border-left:0;border-top:1px solid #d4dfe4}.lib-filters{grid-template-columns:1fr 1fr}.lib-filters label:first-child{grid-column:1/-1}.lib-form{grid-template-columns:1fr}.lib-state{margin-left:0}}

/* 頁尾「回報此頁可能有誤」 */
.sv-course-footer .report-btn{min-height:44px;padding:8px 14px;border:1px dashed #9bb7c5;border-radius:6px;background:#fff;color:#526d7e;font:inherit;font-size:14px;cursor:pointer}
.report-dlg{width:min(520px,calc(100vw - 32px));border:1px solid #ccd8df;border-top:4px solid #205e7a;border-radius:8px;padding:20px 22px;color:#19354b}
.report-dlg::backdrop{background:rgba(25,53,75,.35)}
.report-dlg h2{margin:0 0 6px;font-size:20px}.report-dlg p{font-size:14px;line-height:1.7;color:#3c5666;margin:0 0 10px}
.report-dlg label{display:flex;flex-direction:column;gap:4px;margin:0 0 10px;font-size:13px;font-weight:700;color:#3c5666}
.report-dlg input,.report-dlg textarea{min-height:44px;padding:8px 10px;border:1px solid #b8cbd5;border-radius:6px;font:inherit;font-size:16px}
.report-row{display:flex;gap:8px;justify-content:flex-end;flex-wrap:wrap}
.report-row button{min-height:44px;padding:8px 16px;border:1px solid #205e7a;border-radius:6px;background:#fff;color:#205e7a;font:inherit;font-weight:700;cursor:pointer}
.report-row .is-primary{background:#205e7a;color:#fff}
@media(max-width:650px){.sv-course-footer{flex-wrap:wrap}.sv-course-footer .report-btn{order:3;flex-basis:100%}}

/* 技術資料抽屜：完整數據、契約與歷史預設收起，連結或書籤指到裡面時自動展開。 */
.tech-drawer{border:1px solid #bdcdd6;border-radius:8px;margin:12px 0 14px;background:#fff;min-width:0}
.tech-drawer>summary{display:flex;flex-direction:column;gap:3px;min-height:56px;padding:14px 18px 14px 40px!important;position:relative;cursor:pointer;list-style:none}
.tech-drawer>summary::-webkit-details-marker{display:none}
.tech-drawer>summary:before{content:'';position:absolute;left:18px;top:22px;border:6px solid transparent;border-left:8px solid #205e7a;transition:transform .15s}
.tech-drawer[open]>summary:before{transform:rotate(90deg);transform-origin:4px 6px}
.tech-drawer>summary b{font-size:17px;color:#19354b}.tech-drawer>summary span{font-size:14px;color:#526d7e;line-height:1.6}
.tech-drawer[open]>summary{border-bottom:1px solid #dce4e8}
.tech-drawer-body{padding:4px 18px 18px;min-width:0}
@media(max-width:650px){.tech-drawer-body{padding:4px 10px 14px}}
.bn-lesson-bar{display:flex;flex-wrap:wrap;gap:8px 14px;align-items:center;margin:4px 0 12px;padding:10px 14px;border-left:3px solid #7296a8;background:#f1f6f8}
.bn-lesson-note{margin:0;font-size:15px;color:#3c5666}

/* 大修地圖左側舞台：非模型站改放實照、影片、安全閥立體剖視或管閥剖面 */
.om-media{position:absolute;inset:0;z-index:3;background:#1b2a36}
.om-media-box{position:absolute;inset:0;overflow:hidden;container-type:size}
.om-media-img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.om-media-img.is-rot90{inset:auto;left:50%;top:50%;width:100cqh;height:100cqw;transform:translate(-50%,-50%) rotate(90deg)}
.om-media-video{position:absolute;inset:0;width:100%;height:100%;background:#000;object-fit:contain}
.om-media-box.is-sv3d,.om-media-box.is-valve2d{background:#eef3f6}
.om-sv3d{display:block;width:100%;height:100%;touch-action:none}
.om-valve-svg{position:absolute;inset:0;width:100%;height:100%;max-height:none!important;padding:10px;box-sizing:border-box;background:#fff}
.om-media-status{position:absolute;left:12px;top:12px;margin:0;padding:6px 10px;border-radius:6px;background:rgba(255,255,255,.94);font-size:14px;color:#3c5666}
.om-media-cap{position:absolute;left:0;right:0;bottom:0;margin:0;padding:26px 14px 10px;background:linear-gradient(rgba(14,26,36,0),rgba(14,26,36,.82) 34%);color:#fff;font-size:14px;line-height:1.6;pointer-events:auto}
.om-media-cap b{color:#ffe3a3}.om-media-cap a{color:#ffd27a;font-weight:700;white-space:nowrap}
.om-media:has(.is-video) .om-media-cap{bottom:auto;top:0;padding:10px 14px 26px;background:linear-gradient(rgba(14,26,36,.82) 66%,rgba(14,26,36,0))}
.om-media:has(.is-sv3d) .om-media-cap,.om-media:has(.is-valve2d) .om-media-cap{background:linear-gradient(rgba(14,26,36,0),rgba(14,26,36,.72) 40%)}

/* 管閥剖面（2D SVG）點到零件：發亮閃爍、其他淡化，與立體模型的高亮一致 */
svg:has(.vd-part[data-sel="1"]) .vd-part:not([data-sel="1"])>*{opacity:.3}
.vd-part[data-sel="1"]>:not(text){stroke:#e08a00!important;stroke-width:3.4!important}
.vd-part[data-sel="1"]{animation:vd-glow .5s ease-in-out 5 alternate;filter:drop-shadow(0 0 5px rgba(255,176,32,.9))}
@keyframes vd-glow{from{filter:drop-shadow(0 0 1px rgba(255,176,32,.4))}to{filter:drop-shadow(0 0 9px rgba(255,176,32,1))}}
@media(prefers-reduced-motion:reduce){.vd-part[data-sel="1"]{animation:none}}

/* 模型操作外框（viewer-kit.js）：放大、懸浮操作鈕、操作提示、桌機加寬 */
.vk-hidden{display:none!important}
.vk-module .vk-expand{position:absolute;top:10px;right:10px;z-index:8;min-height:48px;padding:8px 14px;border:1px solid #b8cbd5;border-radius:8px;background:rgba(255,255,255,.95);color:#19354b;font:inherit;font-size:15px;font-weight:700;cursor:pointer;box-shadow:0 1px 4px rgba(0,0,0,.15)}
.vk-module .vk-expand:hover{background:#edf5f8}
.vk-cluster{position:absolute;right:10px;bottom:10px;z-index:8;display:flex;flex-direction:column;gap:6px}
.vk-cluster .vk-btn{width:48px!important;height:48px!important;min-width:48px!important;min-height:48px!important;padding:0!important;margin:0!important;display:grid;place-items:center;border:1px solid #b8cbd5!important;border-radius:10px!important;background:rgba(255,255,255,.95)!important;color:#19354b!important;font-size:21px!important;font-weight:700;line-height:1;box-shadow:0 1px 4px rgba(0,0,0,.15);cursor:pointer}
.vk-cluster .vk-btn:hover{background:#edf5f8!important}.vk-cluster .vk-btn:disabled{opacity:.45}
.vk-cluster .vk-reset{margin-top:6px!important}
.vk-hint{position:absolute;left:10px;bottom:10px;z-index:7;margin:0;max-width:calc(100% - 90px);padding:6px 10px;border-radius:6px;background:rgba(255,255,255,.92);font-size:13px;line-height:1.5;color:#3c5666;transition:opacity .6s;pointer-events:none}
.vk-hint.is-gone{opacity:0}
.v8-legend-cat{flex-basis:100%;margin:8px 0 0;font-size:12.5px;font-weight:800;letter-spacing:.04em;color:#526d7e}
.v8-legend-cat:first-child{margin-top:0}
@media(min-width:1200px){
 .topic-page .vk-module.vk-wide{width:min(1400px,calc(100vw - 64px))!important;max-width:none!important;margin-left:calc(50% - min(700px,50vw - 32px))!important;margin-right:calc(50% - min(700px,50vw - 32px))!important;box-sizing:border-box}
 .vk-wide .v8-stage canvas{height:clamp(560px,calc(100vh - 230px),820px)}
 .vk-wide .v8-model-grid{grid-template-columns:minmax(0,1fr) 360px}
}
html.vk-lock,html.vk-lock body{overflow:hidden}
.vk-module.vk-expanded{position:fixed!important;inset:0!important;z-index:990!important;width:auto!important;max-width:none!important;margin:0!important;left:0!important;transform:none!important;border:0!important;border-radius:0!important;padding:12px 16px!important;overflow:auto!important;background:#fff!important;overscroll-behavior:contain}
.vk-expanded .v8-stage canvas{height:calc(100vh - 150px)!important;min-height:0!important;touch-action:none}
.vk-expanded .v8-model-grid{grid-template-columns:minmax(0,1fr) 360px}
.vk-expanded .v8-model-side{position:sticky;top:0;max-height:calc(100vh - 24px)}
.om.vk-expanded .om-grid{grid-template-columns:minmax(0,1fr) 400px}
.om.vk-expanded .om-stage{aspect-ratio:auto;height:calc(100vh - 230px)}
@media(max-width:760px){
 .vk-expanded .v8-stage canvas{height:calc(100svh - 120px)!important}
 .vk-expanded .v8-model-grid,.om.vk-expanded .om-grid{grid-template-columns:1fr}
 .om.vk-expanded .om-stage{height:62svh}
 .vk-cluster{gap:4px}.vk-hint{font-size:12px}
}
[data-stage-type]:not([data-stage-type="model"]) .vk-hint{display:none}
.vk-expanded .vl-svg{max-height:calc(100vh - 170px)!important;height:calc(100vh - 170px)}