/* 16px on phones, 20px at 1280px, 22px at 1600px and 24px at 1920px with default browser settings. */
html{font-size:clamp(100%,calc(.75rem + .625vw),150%)}

:root{--ink:#213c35;--muted:#64716b;--paper:#f7f8f4;--line:#dfe5dc;--green:#234d3e;--orange:#b7532e;--mint:#edf3ea}
*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Noto Sans TC","PingFang TC","Microsoft JhengHei",sans-serif;line-height:1.65;font-size:1rem}
a{color:inherit;text-decoration:none}
a:hover{color:var(--orange)}
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #ba6036;outline-offset:4px}
button,input{font:inherit}
button,a,input{ -webkit-tap-highlight-color:transparent}
button{cursor:pointer}
h1,h2,h3,p{margin-top:0}
h1,h2,h3{line-height:1.4}
h1{letter-spacing:-.03em}
button{border:0}
.container,.header-inner,.site-footer{width:min(90%,80rem,1440px);margin:auto}
.site-header{background:#fff;border-bottom:1px solid var(--line)}
.header-inner{min-height:104px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:14px}
.brand img{object-fit:contain}
.brand strong{display:block;font-size:1.5rem;letter-spacing:.09em}
.brand small{display:block;font-size:.75rem;letter-spacing:.19em;color:var(--muted)}
nav{display:flex;align-items:center;gap:30px}
nav a{font-size:1rem}
nav .nav-active{border-bottom:2px solid var(--green);padding:12px 0;font-weight:600}
.skip{position:absolute;top:-70px;left:15px;background:white;padding:12px;z-index:5}
.skip:focus{top:5px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.intro{display:flex;align-items:center;justify-content:space-between;gap:30px;padding:66px 0 48px}
.eyebrow{display:block;font-size:.75rem;font-weight:700;letter-spacing:.16em;color:var(--muted);margin-bottom:16px}
.intro h1{font-size:clamp(2rem,4.3vw,3.125rem);font-weight:650;margin-bottom:22px}
.intro em{font-style:normal;color:var(--orange)}
.intro p{color:var(--muted);line-height:1.9;margin-bottom:0}
.intro-seal{width:230px;height:230px;border:1px solid var(--line);border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:20px;background:#eff2e9;flex-shrink:0}
.intro-seal span{font-size:.875rem;letter-spacing:.12em}
.collections{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;margin-bottom:48px}
.collection{display:block;padding:25px 23px 22px;border:1px solid var(--line);border-radius:10px;background:#fff;transition:transform .15s,border-color .15s}
.collection:hover{transform:translateY(-3px);border-color:#91a38d;color:var(--green)}
.collection-no{display:flex;justify-content:space-between;color:var(--orange);font-size:.875rem;letter-spacing:.1em;margin-bottom:28px}
.collection-no span{font-size:1.375rem;line-height:1}
.collection h2{font-size:1.375rem;margin-bottom:9px}
.collection p{font-size:1rem;color:var(--muted);margin-bottom:24px}
.folder-path{font-size:.875rem;color:#667569;overflow-wrap:anywhere}
.breadcrumbs{padding:28px 0;gap:12px;color:var(--muted);flex-wrap:wrap}
.breadcrumbs a,.breadcrumbs span{font-size:.875rem}
.file-card{background:white;border:1px solid var(--line);border-radius:12px;display:grid;grid-template-columns:minmax(0,1fr) 21rem;overflow:hidden}
.file-main{padding:36px}
.file-heading{display:flex;gap:20px;align-items:flex-start;margin:25px 0 30px;min-width:0}
.file-heading>div{min-width:0}
.file-symbol{width:66px;height:82px;background:#ecf1e9;border:1px solid #d5dfd0;border-radius:5px 18px 5px 5px;display:flex;align-items:center;justify-content:center;font-size:1rem;letter-spacing:.05em;flex-shrink:0}
.pill{font-size:.875rem;color:#467142;background:#eef5ea;padding:4px 8px;border-radius:4px}
.file-heading h1{font-size:clamp(1.5rem,2.6vw,2rem);overflow-wrap:anywhere;margin:12px 0 0;line-height:1.55}
.file-details{border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin:0;padding-top:24px}
.file-stat-note{font-size:.875rem;color:var(--muted);margin:1.25rem 0 0}
.preview-metrics{margin-top:1.25rem;grid-template-columns:repeat(3,minmax(0,1fr))}
.file-details dt{font-size:.875rem;color:var(--muted);margin-bottom:8px}
.file-details dd{margin:0;font-size:1rem;font-weight:600}
.file-details small{display:block;color:var(--muted);font-size:.875rem;font-weight:400;margin-top:5px}
.download-panel{background:var(--mint);border-left:1px solid var(--line);padding:32px 26px;display:flex;flex-direction:column;justify-content:flex-start}
.download-panel>p{font-size:1rem;color:var(--muted);margin-bottom:24px}
.primary{width:100%;padding:15px 12px;border-radius:6px;background:var(--green);color:white;text-align:center;font-weight:600;font-size:1rem;display:flex;align-items:center;justify-content:center;gap:12px}
.primary:hover{background:#173a2d}
.button-size{font-size:.875rem;opacity:.85;font-weight:400}
.back-link{font-size:.875rem;color:var(--green)}
.download-panel .back-link{text-align:center;margin-top:1.25rem}
.section-heading{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:22px}
.section-heading .eyebrow{margin-bottom:8px}
.section-heading h2{font-size:1.5rem;margin:0}
.section-heading h2 small{font-size:.875rem;color:var(--muted);font-weight:400;margin-left:12px}
.library{margin-bottom:42px}
.search{display:flex;border:1px solid var(--line);border-radius:6px;background:#fff;overflow:hidden}
.search input{min-width:0;width:190px;border:0;background:none;padding:10px 12px;font-size:1rem}
.search button{background:#edf1e9;color:var(--ink);padding:10px 14px;font-size:.875rem}
.parent{display:inline-block;margin-bottom:15px}
.file-list{background:white;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.list-head,.file-row{display:grid;grid-template-columns:minmax(0,1fr) 7rem 7rem 1.25rem;align-items:center;gap:20px;padding:17px 22px}
.list-head{font-size:.875rem;background:#eef2eb;color:var(--muted)}
.file-row{border-top:1px solid #e9ece5;font-size:1rem;min-height:76px}
.file-row:hover{background:#f5f7f0;color:var(--green)}
.row-name{display:flex;align-items:center;gap:16px;min-width:0}
.row-name>span:last-child{overflow-wrap:anywhere}
.type-tag{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:40px;height:42px;font-size:.75rem;letter-spacing:.04em;color:var(--green);border:1px solid var(--line);border-radius:4px;background:#f6f8f2}
.file-row time,.row-size{font-size:.875rem;color:var(--muted)}
.row-arrow{font-size:1.125rem}
.empty{padding:30px;color:var(--muted);margin:0}
.section-divider{border:0;border-top:1px solid var(--line);margin:1.5rem 0}
.ad{display:flex;align-items:center;gap:22px;padding:24px 28px;background:#f4eee1;border:1px solid #e8deca;border-radius:8px;margin:0}
.ad-label{font-size:.75rem;color:#746344;border:1px solid #d4c8b2;border-radius:3px;padding:2px 5px;flex-shrink:0}
.ad div{flex:1}
.ad strong{font-family:"Songti TC","Noto Serif TC",serif;font-size:1.125rem;font-weight:600;color:#574b35}
.ad p{margin:5px 0 0;color:#7c725f;font-size:.875rem}
.ad a{font-size:.875rem;color:#68543a;flex-shrink:0}
.statistics{margin-bottom:48px}
.stats-caption{font-size:.875rem;color:var(--muted)}
.stats-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:28px 0}
.stats-grid>div{padding:0 24px;border-right:1px solid var(--line)}
.stats-grid>div:first-child{padding-left:0}
.stats-grid>div:last-child{border:0;padding-right:0}
.stats-grid span{display:block;font-size:.875rem;color:var(--muted);margin-bottom:9px}
.stats-grid strong{font-size:clamp(1.5rem,2.3vw,1.875rem);font-weight:550;letter-spacing:-.04em;white-space:nowrap}
.stats-grid small{font-size:.875rem;font-weight:400;margin-left:8px}
.stats-note{font-size:.875rem;color:var(--muted);line-height:1.8;margin:17px 0}
.method{font-size:.875rem;color:var(--muted);max-width:920px}
.method summary{cursor:pointer;text-decoration:underline;text-underline-offset:4px;display:list-item}
.method p{margin:14px 0}
.site-footer{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:24px 0 30px;border-top:1px solid var(--line);font-size:.875rem;color:var(--muted)}
.site-footer>div{display:flex;align-items:center;gap:18px}
.site-footer>div a{font-size:1rem;font-weight:600;color:var(--ink)}
.site-footer p{margin:0;font-size:.75rem}
.notice{background:#fff1df;border:1px solid #e4cba8;color:#734c21;padding:17px 20px;border-radius:7px;margin:24px 0}
.notice a{text-decoration:underline}

@media(max-width:950px){.download-panel{border-left:0;border-top:1px solid var(--line)}
.collections{grid-template-columns:repeat(2,minmax(0,1fr))}
.file-card{grid-template-columns:1fr}
.file-main{padding:28px}
.file-heading{gap:14px}
.file-symbol{width:50px;height:65px}
.file-details{gap:14px}
.file-details dd{font-size:1rem}
.stats-grid>div{padding:0 15px}
.intro-seal{width:190px;height:190px}
.site-footer{align-items:flex-start;flex-direction:column;gap:12px}
}

@media(max-width:680px){.container,.header-inner,.site-footer{width:calc(100% - 36px)}
.header-inner{min-height:82px;gap:12px}
.brand{gap:8px}
.brand img{width:36px;height:36px}
.brand strong{font-size:1.125rem}
.brand small{font-size:.75rem}
nav{gap:16px}
nav a{font-size:.875rem}
.intro{padding:38px 0 28px}
.intro h1{font-size:2.25rem}
.intro p{font-size:1rem}
.intro-seal{display:none}
.collections{gap:12px;margin-bottom:32px}
.collection{padding:19px 17px}
.collection-no{margin-bottom:21px}
.collection h2{font-size:1.125rem}
.collection p{font-size:.875rem;margin-bottom:18px}
.folder-path{font-size:.75rem}
.eyebrow{font-size:.75rem;letter-spacing:.12em}
.breadcrumbs{padding:22px 0;gap:8px}
.file-card{grid-template-columns:1fr}
.file-main{padding:24px 20px}
.file-heading{margin:20px 0 24px}
.file-heading h1{font-size:1.5rem}
.file-symbol{width:44px;height:59px;font-size:.75rem}
.file-details{grid-template-columns:1fr 1fr;row-gap:22px}
.preview-estimate{grid-column:1/-1}
.file-details dd{font-size:1rem}
.file-details small{display:inline;margin-left:8px}
.download-panel{border-left:0;border-top:1px solid var(--line);padding:24px}
.download-panel>p{margin-bottom:18px}
.section-heading{align-items:flex-start;flex-direction:column;gap:15px}
.section-heading h2{font-size:1.375rem}
.search{width:100%}
.search input{flex:1;width:0;font-size:1rem}
.list-head{display:none}
.file-row{grid-template-columns:1fr auto;gap:8px;padding:16px}
.row-name{grid-column:1/-1;gap:12px}
.row-name>span:last-child{font-size:1rem}
.file-row time{grid-column:1;padding-left:52px;font-size:.875rem}
.row-size{grid-column:2;font-size:.875rem}
.row-arrow{display:none}
.type-tag{width:40px;height:40px}
.ad{padding:19px 17px;gap:12px;flex-wrap:wrap}
.ad div{flex-basis:calc(100% - 50px)}
.ad strong{font-size:1rem}
.ad p{font-size:.875rem}
.ad a{margin-left:43px;font-size:.875rem}
.stats-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px 0;padding:22px 0}
.stats-grid>div{padding:0 0 0 20px}
.stats-grid>div:nth-child(odd){padding-left:0}
.stats-grid>div:nth-child(even){border:0}
.stats-grid strong{font-size:1.75rem}
.stats-grid span{font-size:.875rem}
.stats-note{font-size:.75rem}
.method{font-size:.875rem}
.site-footer>div{gap:12px}
.site-footer p{font-size:.75rem}
.notice{font-size:1rem;padding:14px}
}

@media(prefers-reduced-motion:reduce){*{transition:none!important}
}


@media(min-width:1601px){.intro{padding-top:3.5rem}
.file-main{padding:2rem}
.download-panel{padding:2rem 1.5rem}
.file-details{gap:1.25rem}
.stats-grid{padding:1.75rem 0}
}


/* Keep controls and metadata readable without forcing long content wider than its card. */
.primary{flex-wrap:wrap;gap:.5rem}
.button-size{white-space:nowrap}
.file-details small{display:block;margin-left:0;overflow-wrap:anywhere}
.ad div{min-width:0}
.site-footer p{overflow-wrap:anywhere}
.file-row time,.row-size{white-space:nowrap}

@media(max-width:680px){.header-inner{flex-wrap:wrap;padding:1rem 0}
.header-inner nav{gap:1rem}
.intro p,.collection p,.download-panel>p,.row-name>span:last-child,.method{font-size:1rem}
.stats-note{font-size:.875rem}
.stats-grid strong{font-size:1.5rem}
.ad strong{font-size:1.125rem}
.ad a{font-size:.875rem}
.file-row time,.row-size{white-space:normal}
}


@media(min-width:681px) and (max-width:950px){
.stats-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:1.5rem 0}
.stats-grid>div{padding:0 1.25rem}
.stats-grid>div:nth-child(odd){padding-left:0}
.stats-grid>div:nth-child(even){border-right:0}
}

/* Filename and main button submit the same signed form, including without JavaScript. */
.filename-download{display:inline;padding:0;background:none;color:var(--green);font:inherit;letter-spacing:inherit;text-align:left;overflow-wrap:anywhere;text-decoration:underline;text-decoration-thickness:1px;text-decoration-color:#b3c5b6;text-underline-offset:.2em}
.filename-download:hover,.filename-download:focus-visible{color:#16834a;text-decoration-color:currentColor}
.download-icon{display:inline-block;width:1.2em;height:1.2em;vertical-align:-.18em;flex-shrink:0;background:currentColor;-webkit-mask:url('/assets/download.svg') center/contain no-repeat;mask:url('/assets/download.svg') center/contain no-repeat}
.filename-download .download-icon{color:#16834a;opacity:0;transition:opacity .15s}
.filename-ending{white-space:nowrap}
.filename-download:hover .download-icon,.filename-download:focus-visible .download-icon{opacity:1}
.share-panel{padding:1.5rem 0 2rem}
.share-heading{display:flex;align-items:baseline;gap:1rem;flex-wrap:wrap;margin-bottom:1rem}
.share-heading h2{font-size:1.125rem;margin:0}
.share-heading>span{font-size:.875rem;color:var(--muted)}
.share-options{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:.4rem;margin-bottom:1.25rem}
.share-options a,.share-options button,.copy-row button{display:inline-flex;align-items:center;justify-content:center;min-height:2.75rem;padding:.5rem .9rem;border:1px solid #bdcdbb;border-radius:.4rem;background:#fff;color:var(--green);font-size:.875rem;font-weight:550}
.share-options a,.share-options button{min-height:2rem;padding:.25rem .65rem}
@media(pointer:coarse){.share-options a,.share-options button{min-height:2.75rem}}
.share-options a:hover,.share-options button:hover,.copy-row button:hover{background:#e7efe2;border-color:#799474;color:var(--green)}
.share-url-label{display:block;font-size:.875rem;margin-bottom:.35rem;color:var(--muted)}
.copy-row{display:flex;align-items:stretch;gap:.6rem}
.copy-row input{width:0;min-width:0;flex:1;border:1px solid var(--line);border-radius:.4rem;background:#fff;padding:.6rem .75rem;font-size:1rem;color:var(--ink)}
.copy-row button{flex-shrink:0;background:var(--mint)}
.copy-status{margin:.6rem 0 0;font-size:.875rem;color:var(--muted);min-height:1.65em}
.copy-status[data-success="true"]{color:#17653b}
.share-panel [hidden]{display:none}
.ad strong{overflow-wrap:anywhere}
@media(hover:none){.filename-download .download-icon{opacity:1}}
@media(max-width:680px){.share-heading{gap:.3rem}.copy-row{flex-wrap:wrap}.copy-row input{flex-basis:100%;width:100%}.copy-row button{width:100%}}

.video-preview{width:100%;max-width:20rem;margin:1.25rem 0 0;align-self:center}
.preview-heading{display:flex;align-items:center;justify-content:space-between;gap:.75rem;margin-bottom:.65rem}
.preview-heading h2{font-size:1rem;margin:0}
.preview-heading button{min-height:2.5rem;padding:.35rem .6rem;color:var(--green);background:var(--mint);border:1px solid var(--line);border-radius:.35rem;font-size:.875rem}
.preview-heading button:disabled{opacity:.55;cursor:default}
.video-shell{position:relative;aspect-ratio:16/9;background:#152b23;border:1px solid #264c3c;border-radius:.5rem;overflow:hidden}
.video-shell video{display:block;width:100%;height:auto;aspect-ratio:16/9;object-fit:contain;background:#101914}
.video-shell video:fullscreen{width:100%;height:100%;background:#000}
.video-shell video:-webkit-full-screen{width:100%;height:100%;background:#000}
.preview-start{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.65rem;width:100%;color:#fff;background:linear-gradient(135deg,#1c3c2f,#13261f);font-size:1rem}
.preview-start:hover{background:#234d3e}
.preview-start:focus-visible{outline-offset:-5px;outline-color:#fff}
.preview-play{display:flex;align-items:center;justify-content:center;width:3rem;height:3rem;padding-left:.15rem;border:1px solid #adcbb3;border-radius:50%;font-size:1.1rem}
.preview-status{font-size:.875rem;color:var(--muted);margin:.6rem 0 0;line-height:1.7}
.video-preview [hidden]{display:none}