/* Theme folders keep the course's cream paper and muted scene colors. */
#entry-main .article-stack-library{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px 18px;padding:16px 8px 24px}
#entry-main .article-stack{position:relative;min-width:0;margin:0;isolation:isolate}
.article-stack-cover{position:relative;display:block;width:100%;aspect-ratio:1.05;border:0;padding:0;background:none;color:var(--stack-ink);font:inherit;cursor:pointer;isolation:isolate;text-align:left;perspective:700px}
.folder-back{position:absolute;left:0;right:0;top:26%;bottom:2%;border:1px solid #c6cfbc;border-radius:9px 15px 15px;background:var(--stack-tint);box-shadow:0 9px 16px #34483113}
.folder-back::before{content:'';position:absolute;left:-1px;top:-12px;width:42%;height:18px;border:1px solid #c6cfbc;border-bottom:0;border-radius:8px 12px 0 0;background:var(--stack-tint)}
.folder-peeks{position:absolute;inset:0;pointer-events:none}
.folder-peek{position:absolute;top:calc(5% + var(--peek)*2%);left:calc(10% + var(--peek)*14%);width:53%;height:72%;border:3px solid #fffdf5;border-bottom-width:16px;border-radius:7px;background:#fffdf5;box-shadow:0 3px 6px #33432c20;overflow:hidden;transform:rotate(calc(-13deg + var(--peek)*11deg));transform-origin:50% 100%;transition:transform .3s}
.article-stack-cover:hover .folder-peek{transform:translateY(-4px) rotate(calc(-16deg + var(--peek)*13deg))}
.stack-scene{display:block;position:relative;width:100%;height:100%;overflow:hidden;background:var(--stack-tint)}
.stack-scene-tile{position:absolute;width:100%;aspect-ratio:1;top:0;left:0;transform:translateY(-6%);background-repeat:no-repeat}
.stack-scene-empty{background:linear-gradient(140deg,var(--stack-tint),#fff8e6)}
.folder-front{position:absolute;left:0;right:0;bottom:0;height:59%;border:1px solid #d1d7c6;border-top:1px solid #fffefa;border-radius:9px 13px 15px 15px;background:linear-gradient(155deg,#fffdf5f5,var(--stack-tint));box-shadow:0 9px 14px #33432c15,inset 0 1px 0 #fff;transform-origin:50% 100%;transform:perspective(650px) rotateX(-8deg);display:flex;align-items:stretch;overflow:hidden}
.folder-label{display:flex;flex-direction:column;justify-content:center;gap:7px;min-width:0;width:100%;padding:10px 11px;color:var(--stack-ink)}
.folder-label strong{font-size:clamp(14px,2vw,20px);line-height:1.35;font-weight:650;overflow-wrap:anywhere}
.folder-topics{font-size:10px;line-height:1.5;color:#7a806c;overflow-wrap:anywhere}
.folder-meta{display:flex;align-items:center;justify-content:space-between;gap:4px;font-size:10px;line-height:1.4;color:#7d8570}
.stack-action{font-size:9px;color:var(--stack-ink)}
.article-stack-cover:focus-visible,.folder-close:focus-visible,.folder-open-cover:focus-visible,.folder-article:focus-visible{outline:3px solid #819967;outline-offset:4px}
#entry-main.articles-screen{position:relative}
.article-stack{transition:opacity .3s ease}
#entry-main>.articles-header,#entry-main>.article-level,#entry-main>.article-filters{transition:opacity .25s ease}
#entry-main.is-folder-open>.articles-scroll .article-stack{opacity:0;pointer-events:none}
#entry-main.is-folder-open>.articles-header,#entry-main.is-folder-open>.article-level,#entry-main.is-folder-open>.article-filters{opacity:0;pointer-events:none}
.article-stack.is-folder-selected>.article-stack-cover{opacity:0!important}
.article-folder-view{position:absolute;inset:0;z-index:10;box-sizing:border-box;display:flex;flex-direction:column;min-width:0;min-height:0;margin:0;padding:0;border:0;border-radius:0;background:none;box-shadow:none;color:#344537;overflow:hidden;overscroll-behavior:contain}
.folder-dialog-header{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:18px 22px 12px;flex:none;position:relative;z-index:5;background:none}
.folder-dialog-header h2{font-size:21px;line-height:1.35;margin:0;color:var(--stack-ink);font-weight:650;overflow-wrap:anywhere}
.folder-dialog-header p{font-size:11px;color:#899079;margin:5px 0 0}
.folder-close{display:grid;place-items:center;flex:none;width:38px;height:38px;padding:0;border:1px solid #d6ddca;border-radius:50%;background:#fffdf5;color:var(--stack-ink);font-size:26px;font-weight:300;cursor:pointer}
.folder-stage{display:flex;flex-direction:column;flex:1;min-height:0;position:relative;isolation:isolate}
.folder-articles{display:block;flex:1 1 0%;min-height:0;overflow:auto;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:#bdc8af transparent;padding:18px 24px 24px;scroll-padding:20px}
.folder-article-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-auto-rows:max-content;align-content:start;align-items:start;gap:30px 18px;width:100%;height:auto;min-height:min-content}
.article-stack-cover[aria-busy="true"]{cursor:progress;opacity:.75}
 #entry-main .article-folder-view .folder-article{box-sizing:border-box;display:flex;flex-direction:column;min-width:0;gap:0;padding:0;border:1px solid #dce0d2;border-radius:10px;background:#fffdf7;text-decoration:none;color:var(--stack-ink);box-shadow:0 6px 13px #33432c13;overflow:hidden;transform:rotate(var(--card-tilt));transform-origin:50% 85%;transition:box-shadow .2s,translate .2s}
.folder-article:hover{translate:0 -3px;box-shadow:0 10px 18px #33432c25}
.folder-article-art{aspect-ratio:1.45;height:auto;width:100%;flex:none;filter:saturate(.88)}
.folder-article-copy{display:flex;flex-direction:column;flex:none;gap:5px;padding:10px 11px 12px;min-width:0}
.folder-article-index{display:flex;justify-content:space-between;align-items:center;font-size:10px;color:#959d86}
.folder-article-index .level-pill{font-size:9px;line-height:1.4;background:var(--stack-tint);color:var(--stack-ink);padding:2px 5px;border-radius:4px}
.folder-article h3{font-size:16px;line-height:1.4;font-weight:650;color:var(--stack-ink);margin:0;overflow-wrap:anywhere}
#entry-main .article-folder-view .article-title-nl{font:12px/1.45 Georgia,serif;color:#7a836c;margin:0;overflow-wrap:anywhere}
.folder-article-meta{font-size:9px;color:#939980;margin-top:3px;line-height:1.5}
.folder-dock{position:relative;flex:0 0 180px;z-index:4;background:none;pointer-events:none}
.folder-open-cover{position:absolute;left:0;top:0;bottom:auto;margin:0;width:auto;aspect-ratio:auto;border:0;padding:0;background:none;color:var(--stack-ink);font:inherit;cursor:pointer;pointer-events:auto;isolation:isolate;transform-origin:50% 50%;will-change:left,top,width,height}
.folder-open-cover .folder-peeks{opacity:0}
#entry-main .article-folder-view .folder-article{min-height:0;align-self:start}
#entry-main .article-folder-view .folder-article h3{font-size:16px;line-height:1.4;margin:0}
@media(min-width:700px){#entry-main .article-stack-library{grid-template-columns:repeat(3,minmax(0,1fr));gap:30px 26px}.folder-article-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:32px 22px}.folder-articles{padding:22px 34px 28px}}
@media(min-width:1100px){#entry-main .article-stack-library{grid-template-columns:repeat(4,minmax(0,1fr));gap:32px}.folder-label{padding:14px 16px}}
@media(min-width:1600px){#entry-main .article-stack-library{grid-template-columns:repeat(5,minmax(0,1fr))}}
@media(max-width:380px){#entry-main .article-stack-library{gap:20px 14px;padding:13px 5px 22px}.folder-topics{display:none}.folder-label{gap:6px;padding:9px}.folder-meta{font-size:9px}.folder-meta .stack-action{font-size:0}.folder-meta .stack-action::after{content:'↗';font-size:13px}.folder-dialog-header{padding:15px 16px 8px}.folder-dialog-header h2{font-size:18px}.folder-articles{padding:14px 17px 20px}.folder-article-grid{gap:28px 16px}.folder-article h3{font-size:14px}.folder-article-copy{padding:8px}}
@media(max-width:380px){#entry-main .article-folder-view .folder-article h3{font-size:14px}}
@media(prefers-reduced-motion:reduce){.folder-peek,.folder-article{transition:none!important}.folder-article{transform:none!important}.article-stack,#entry-main>.articles-header,#entry-main>.article-level{transition:none!important}}
/* Preserve the established wide opened-folder form; morph dimensions, not glyphs. */
body.has-open-article-folder #entry-nav{display:none!important}
.folder-open-cover .folder-back{top:15%}
.folder-open-cover .folder-front{height:83%;transform:perspective(650px) rotateX(-24deg)}
.folder-open-cover .folder-label{padding:13px 20px;gap:10px;text-align:center}
.folder-open-cover .folder-label strong{font-size:19px}
.folder-open-cover .folder-meta{font-size:11px}
.folder-open-cover .folder-topics{display:none}
.folder-open-cover .stack-action{font-size:10px}
.folder-open-cover .stack-action::after{content:none}
.is-returning .folder-open-cover .folder-label{padding:10px 11px;gap:7px;text-align:left}
.is-returning .folder-open-cover .folder-topics{display:block}
.is-returning .folder-open-cover .folder-meta{font-size:10px}
@media(max-width:380px){.is-returning .folder-open-cover .folder-topics{display:none}}