/* Shared directory controls follow the archive. Cards retain each section's purpose. */
.content-directory{--directory-line:#b4a17a40;--directory-muted:#adb7b2;--directory-ink:#d8d4c5}
.content-directory .catalog-filters button{font-weight:400}
.content-directory .catalog-filter-stack{display:grid;gap:8px;min-width:0}
.experiment-browser .catalog-difficulty-row{display:flex;align-items:center;gap:10px;min-width:0}
.experiment-browser .catalog-filter-label{flex:0 0 auto;color:#aeb7b0;font-size:.8125rem;line-height:1.5}
.experiment-browser .catalog-difficulty-filters{flex-wrap:nowrap}
.experiment-browser .catalog-difficulty-filters button{min-width:48px;padding:8px 12px;color:#c5b187;font-size:.875rem;letter-spacing:.04em}
.experiment-browser .catalog-difficulty-filters button[aria-pressed=true]{color:#ead7ad}
.content-directory .catalog-more{padding-top:30px}
.content-directory .catalog-more button{min-width:240px;background:#3b443bd9}
.content-directory .catalog-empty p{color:var(--directory-muted)}
.content-directory :is(a,button,input,summary):focus-visible{outline:2px solid #c7b185;outline-offset:4px}

/* A row shows two complete invitations, with artwork above short, readable copy. */
.experiment-directory-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.experiment-browser .murdle-feature{min-width:0;margin:0;border:1px solid var(--directory-line);border-radius:4px;overflow:hidden;background:#202d2a;box-shadow:0 10px 28px #0003}
.experiment-browser .murdle-feature+.murdle-feature{margin-top:0}
.experiment-browser .murdle-feature-cover{position:relative;display:grid;grid-template-columns:minmax(0,1fr);grid-template-rows:auto auto 1fr auto;min-height:0;height:100%;padding:0;background:transparent;color:var(--directory-ink);text-decoration:none}
.experiment-browser .murdle-feature-cover::before,.experiment-browser .murdle-feature-cover::after{display:none}
.experiment-browser .murdle-feature-top{grid-row:1;position:relative;display:flex;align-items:center;justify-content:space-between;gap:12px;margin:0;padding:16px 22px;min-height:64px;border-bottom:1px solid var(--directory-line);background:#1d2928}
.experiment-browser .murdle-feature-edition{display:flex;align-items:center;gap:12px;min-width:0;font-size:.875rem;line-height:1.6;letter-spacing:0;color:#b9b59f}
.experiment-browser .murdle-feature-edition>span{padding-right:12px;flex-shrink:0;font-size:1.35rem;line-height:1.2;color:#d0bb91}
.experiment-browser .murdle-feature-scene{grid-row:2;position:relative;z-index:0;display:block;inset:auto;width:100%;height:auto;aspect-ratio:3/2;object-fit:cover;object-position:center;opacity:1;filter:brightness(.88) saturate(.85);border-bottom:1px solid var(--directory-line)}
.experiment-browser .murdle-feature-story{grid-row:3;position:relative;max-width:none;margin:0;padding:23px 25px 25px;text-shadow:none}
.experiment-browser .murdle-feature-story h2{font-size:clamp(1.45rem,2.1vw,1.9rem);line-height:1.5;letter-spacing:.025em;margin:0 0 12px;color:#ddd5c1}
.experiment-browser .murdle-feature-story>p{font-size:1rem;line-height:1.85;margin:0;color:#b7c0b7;overflow-wrap:anywhere}
.experiment-browser .murdle-feature-action{grid-row:4;position:relative;min-height:58px;margin:0 25px;padding:13px 0;font-size:.9375rem;color:#cbb58e}
.experiment-browser .murdle-feature-action>span:last-child{font-size:1.25rem}

/* Source cards and further reading share a compact shelf rhythm. */
.library-browser .library-directory-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;align-items:stretch}
.library-browser .directory-source{min-width:0;display:flex}
.library-browser .directory-source>.source-path{width:100%;grid-template-columns:minmax(0,.6fr) minmax(0,1.4fr)}
.library-browser .source-path-image{min-height:275px}
.library-browser .source-path-copy{padding:22px}
.library-browser .source-path-copy>h2{font-size:clamp(1.3rem,1.7vw,1.65rem);margin:11px 0}
.library-browser .source-path-copy .source-reading{font-size:.9375rem;line-height:1.85;margin-bottom:20px}
.library-browser .source-path-copy .source-chapter{margin-bottom:10px}
.library-browser .source-path-links>a{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:4px 18px;align-items:center;min-height:76px;padding:14px 21px}
.library-browser .source-path-links a>span{grid-column:1;grid-row:1;font-size:.8125rem}
.library-browser .source-path-links strong{grid-column:1;grid-row:2;font-size:.9375rem}
.library-browser .source-path-links b{grid-column:2;grid-row:1/3;gap:9px;margin:0;white-space:nowrap}
.library-browser .directory-book{display:grid;grid-template-columns:minmax(0,.6fr) minmax(0,1.4fr);min-width:0;border:1px solid var(--directory-line);border-radius:4px;overflow:hidden;background:#222e30;box-shadow:0 10px 28px #0003}
.library-browser .directory-book-cover{--book-cloth:#263934;display:flex;position:relative;flex-direction:column;align-items:center;justify-content:center;min-width:0;min-height:275px;padding:27px 19px 27px 24px;text-align:center;background:linear-gradient(90deg,#0a151980 0 5px,transparent 6px 10px,#b4a17a30 11px,transparent 12px),linear-gradient(130deg,#ffffff03,transparent 55%,#060f1626),var(--book-cloth);border-right:1px solid var(--directory-line);color:#cbbb96;text-decoration:none}
.library-browser .directory-book-tone-1 .directory-book-cover{--book-cloth:#323430}
.library-browser .directory-book-tone-2 .directory-book-cover{--book-cloth:#2b303b}
.library-browser .directory-book-cover::before{content:'';position:absolute;inset:14px 12px 14px 19px;border:1px solid #b4a17a38;pointer-events:none}
.library-browser .directory-book-cover>span{font:.8125rem/1.5 Georgia,serif;letter-spacing:.05em;color:#a99e82}
.library-browser .directory-book-cover>strong{margin:22px 0 19px;font:500 clamp(1.1rem,1.7vw,1.5rem)/1.65 "Songti SC","Noto Serif CJK SC",Georgia,serif;overflow-wrap:anywhere}
.library-browser .directory-book-cover>small{font:.65rem/1.8 Georgia,serif;letter-spacing:.08em;overflow-wrap:anywhere;color:#a99e82}
.library-browser .directory-book-copy{display:flex;flex-direction:column;min-width:0;padding:22px}
.library-browser .directory-book-copy h2{font:500 clamp(1.3rem,1.7vw,1.65rem)/1.55 "Songti SC","Noto Serif CJK SC",Georgia,serif;margin:11px 0 14px;color:#d8d4c5;overflow-wrap:anywhere}
.library-browser .directory-book-copy h2 a{color:inherit;text-decoration:none}
.library-browser .directory-book-copy>p,.library-browser .directory-book-copy details p{font-size:.9375rem;line-height:1.85;color:var(--directory-muted);margin:0 0 18px;overflow-wrap:anywhere}
.library-browser .directory-book-copy details{margin:0 0 20px;border:0;background:none;padding:0}
.library-browser .directory-book-copy summary{padding:7px 0;min-height:40px;font-size:.875rem;line-height:1.6;color:#b7ac92;cursor:pointer}
.library-browser .directory-book-copy details p{margin:8px 0 0}
.library-browser .source-read-link{font-size:.875rem;padding:10px 12px;min-height:46px}
@media(hover:hover){
 .experiment-browser .murdle-feature:hover,.library-browser .directory-book:hover{border-color:#b4a17a99}
 .experiment-browser .murdle-feature-cover:hover{background:#ffffff02}
 .library-browser .directory-book-cover:hover,.library-browser .source-read-link:hover{filter:brightness(1.08)}
}
@media(max-width:1050px) and (min-width:741px){
 .library-browser .directory-source>.source-path,.library-browser .directory-book{grid-template-columns:minmax(0,.5fr) minmax(0,1.5fr)}
 .library-browser .source-path-copy,.library-browser .directory-book-copy{padding:18px}
 .library-browser .source-path-links>a{padding:13px 18px;gap:5px 12px}
 .experiment-browser .murdle-feature-top{padding:14px 18px}
 .experiment-browser .murdle-feature-edition{font-size:.8125rem;gap:9px}
}
@media(max-width:740px){
 .experiment-directory-grid,.library-browser .library-directory-grid{grid-template-columns:minmax(0,1fr);gap:20px}
 .library-browser .catalog-filters{grid-template-columns:repeat(3,minmax(0,1fr))}
 .experiment-browser .catalog-filter-stack{gap:10px}
 .experiment-browser .catalog-difficulty-row{display:grid;gap:6px}
 .experiment-browser .catalog-difficulty-filters{grid-template-columns:repeat(4,minmax(0,1fr))}
 .experiment-browser .catalog-difficulty-filters button{min-width:0;padding-inline:3px;font-size:.8125rem;letter-spacing:.02em}
 .experiment-browser .murdle-feature-top{padding:14px 18px;min-height:60px}
 .experiment-browser .murdle-feature-story{padding:20px 21px 22px}
 .experiment-browser .murdle-feature-story h2{font-size:1.5rem}
 .experiment-browser .murdle-feature-action{margin-inline:21px}
 .library-browser .source-path-links>a{padding:14px 19px}
}
@media(max-width:580px){
 .library-browser .directory-source>.source-path{grid-template-columns:minmax(0,.55fr) minmax(0,1.45fr);grid-template-rows:1fr auto}
 .library-browser .source-path-image{grid-column:1;grid-row:1;aspect-ratio:auto;min-height:250px;border-right:1px solid var(--directory-line);border-bottom:0}
 .library-browser .source-path-copy{grid-column:2;grid-row:1;padding:17px}
 .library-browser .source-path-links{grid-column:1/-1;grid-row:2}
 .library-browser .source-path-image>span{left:8px;right:8px;max-width:calc(100% - 16px);font-size:.8125rem;padding:4px 6px}
 .library-browser .directory-book{grid-template-columns:minmax(0,.55fr) minmax(0,1.45fr)}
 .library-browser .directory-book-copy{padding:17px}
 .library-browser .directory-book-cover{padding:25px 14px 25px 21px;min-height:250px}
 .library-browser .directory-book-cover>small{font-size:.6rem;letter-spacing:.03em}
 .library-browser .source-path-copy>h2,.library-browser .directory-book-copy h2{font-size:1.25rem}
 .library-browser .source-author{font-size:.8125rem}
 .library-browser .source-path-copy .source-reading,.library-browser .directory-book-copy>p{font-size:.9375rem;line-height:1.8}
 .library-browser .source-path-links>a{gap:4px 12px}
 .library-browser .source-path-links strong{font-size:.875rem}
}
@media(max-width:360px){
 .experiment-browser .murdle-feature-top{gap:8px;padding:12px 14px}
 .experiment-browser .murdle-feature-edition{font-size:.75rem;gap:8px}
 .experiment-browser .murdle-feature-edition>span{padding-right:8px;font-size:1.2rem}
 .experiment-browser .catalog-status{font-size:.75rem;padding:4px 5px}
 .library-browser .source-path-copy,.library-browser .directory-book-copy{padding:14px}
 .library-browser .directory-book-cover>small{display:none}
}

/* Shared difficulty label: catalog and investigation headings. */
.experiment-title-line{display:flex;align-items:center;flex-wrap:wrap;gap:10px 18px;margin-bottom:12px}
.murdle-heading .experiment-title-line{margin:16px 0 20px}
.experiment-browser .experiment-title-line h2,.murdle-heading .experiment-title-line h1{margin:0}
.experiment-difficulty{display:inline-flex;align-items:center;gap:8px;white-space:nowrap;flex-shrink:0;color:#bac1b6;font:400 .875rem/1.65 var(--font-sans,sans-serif);letter-spacing:0}
.experiment-stars{color:#d0b580;font-size:1rem;letter-spacing:.1em}