@font-face{font-family:RocReader;src:url('assets/roc-v5/fonts/roc-reader.woff2') format('woff2');font-weight:600;font-display:swap}
:root{--ground:#eeeee9;--ink:#293b47;--muted:#596d77;--line:#c9cece;--accent:#80623d;--panel:#f7f7f1;--serif:RocReader,'Songti SC',SimSun,serif;--sans:'Segoe UI','Microsoft YaHei',sans-serif;color-scheme:light}
*{box-sizing:border-box}html,body{margin:0;width:100%;min-height:100%;background:var(--ground);color:var(--ink);font:14px/1.8 var(--sans)}body{height:100dvh;overflow:hidden;display:flex;flex-direction:column}body:has(dialog[open]){overflow:hidden}body[data-light=uv]{--ground:#171f29;--ink:#d8e0e3;--muted:#adbcc5;--line:#3e4b56;--accent:#c2a477;--panel:#202b35;color-scheme:dark}button,input{font:inherit;color:inherit}button{border:0;background:none;cursor:pointer;min-height:44px}button:disabled{opacity:.3;cursor:default}button,a,input,summary{outline-offset:4px}button:hover:not(:disabled),a:hover{color:var(--accent)}:focus-visible{outline:2px solid var(--accent)}a{color:inherit;text-decoration:none}svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.4;stroke-linecap:round;stroke-linejoin:round;flex:none}h1,h2,p,figure{margin:0}h1,h2{font-family:var(--serif);font-weight:600}img{display:block;max-width:100%;height:auto}::selection{background:#b4c8ce;color:#1d313c}input{caret-color:var(--accent)}*{scrollbar-width:thin;scrollbar-color:#96a5aa transparent}[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}.skip{position:fixed;top:10px;left:12px;padding:8px 15px;background:var(--panel);z-index:50;transform:translateY(-180%)}.skip:focus{transform:none}.icon-button{width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;padding:0;flex:none}
.reader-header{height:76px;flex:none;display:flex;align-items:center;padding-inline:42px;gap:26px}.reader-brand{display:inline-flex;align-items:center;gap:10px;min-height:44px;font:600 20px/1.5 var(--serif);letter-spacing:.12em}.reader-brand svg{width:20px;height:25px}.reader-header h1{font:12px/1.7 var(--sans);letter-spacing:.05em;color:var(--muted);padding-left:25px;border-left:1px solid var(--line)}.reader-header nav{margin-left:auto;display:flex;align-items:center;gap:20px}.reader-header nav button{font-size:12px;padding:5px 8px}.reader-header nav .icon-button{padding:0}
.reading-room{flex:1;min-height:0;position:relative;display:flex;width:100%;padding:0 28px}.book-area{position:relative;flex:1;min-width:0;display:flex;flex-direction:column}.book-stage{flex:1;min-height:0;position:relative;outline-offset:-4px}.book-initial{height:100%;display:flex;justify-content:center;align-items:center;flex-direction:column;gap:16px;color:var(--muted);font-size:12px}.book-initial img{height:85%;max-height:650px;width:auto;object-fit:contain}.spread-captions{min-height:43px;display:flex;align-items:center;justify-content:center;gap:45px;font-size:12px;flex:none}.spread-captions button{display:flex;align-items:baseline;justify-content:center;gap:12px;padding:4px 8px;max-width:44%;position:relative;min-height:40px;color:var(--muted)}.spread-captions button[aria-pressed=true]{color:var(--ink)}.spread-captions button[aria-pressed=true]:after{content:'';position:absolute;left:8px;right:8px;bottom:3px;height:1px;background:var(--accent)}.page-number{font-size:11px;font-variant-numeric:tabular-nums;color:var(--muted)}.page-title{font-family:var(--serif);font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.reader-dock{height:71px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:30px;padding-inline:42px;flex:none}.light-controls{display:flex;align-items:center;gap:8px}.light-controls button,.info-light button{min-width:47px;padding:8px 8px;font-size:12px;position:relative;color:var(--muted)}.light-controls button[aria-pressed=true],.info-light button[aria-pressed=true]{color:var(--ink)}.light-controls button[aria-pressed=true]:after,.info-light button[aria-pressed=true]:after{content:'';position:absolute;bottom:4px;height:1px;background:var(--accent);left:8px;right:8px}.paging{display:flex;align-items:center;gap:18px}.paging #page-index{min-width:95px;padding:8px;font-size:12px;font-variant-numeric:tabular-nums;letter-spacing:.08em}.view-controls{justify-self:end;display:flex;align-items:center;gap:8px;font-size:12px}.view-controls>button:not(.icon-button){padding:6px 8px;min-width:44px}.view-controls>button[aria-pressed=true]{color:var(--accent)}.gesture-hint{height:31px;flex:none;text-align:center;font-size:11px;color:var(--muted);padding-bottom:12px;pointer-events:none}
.page-panel{width:330px;flex:none;align-self:stretch;overflow:auto;background:var(--panel);margin:10px 10px 0 20px;border-radius:2px;scrollbar-gutter:stable}.panel-top{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--line);position:sticky;top:0;background:var(--panel);z-index:2}.side-tabs{display:flex;align-items:center;gap:20px;font-size:12px}.side-tabs button{padding:5px 0;color:var(--muted)}.side-tabs button[aria-pressed=true]{color:var(--ink);text-decoration:underline;text-decoration-color:var(--accent);text-underline-offset:8px}.panel-copy{padding:24px}.geography{font-size:11px;line-height:1.9;color:var(--muted);margin-bottom:12px}.panel-copy h2{font-size:27px;line-height:1.5;margin-bottom:22px}.panel-copy>p:not(.geography){font-size:13px;line-height:2;color:var(--muted)}.info-light{display:flex;gap:12px;margin-block:18px 26px}.meaning{border-top:1px solid var(--line);padding-top:24px}.detail-open{display:flex;align-items:center;justify-content:space-between;width:100%;font-size:12px;padding:14px 0;border-bottom:1px solid var(--line);margin-top:24px}.detail-open svg{width:17px}details{font-size:12px;margin-top:24px;color:var(--muted)}summary{cursor:pointer;min-height:44px;padding-block:10px}details p{line-height:1.9;font-size:12px}details ul{padding-left:17px;line-height:1.9}details a{text-decoration:underline;text-underline-offset:3px}
dialog{border:0;background:var(--panel);color:var(--ink);padding:0;max-height:calc(100dvh - 48px);width:min(1180px,calc(100vw - 70px));max-width:none;overflow:auto}dialog::backdrop{background:rgb(17 26 32 / .58)}.dialog-header{display:flex;align-items:center;justify-content:space-between;gap:22px;padding:18px 28px;border-bottom:1px solid var(--line);position:sticky;top:0;background:var(--panel);z-index:3}.dialog-header h2{font-size:23px;line-height:1.5}.catalog-toolbar{display:flex;align-items:center;justify-content:space-between;gap:25px;padding:26px 30px 18px}.catalog-toolbar label{display:flex;align-items:center;gap:14px;border-bottom:1px solid var(--line);min-width:320px}.catalog-toolbar svg{width:18px}.catalog-toolbar input{width:100%;border:0;background:transparent;min-height:44px;font-size:13px}.catalog-toolbar input::placeholder{color:var(--muted)}.catalog-toolbar p{font-size:12px;color:var(--muted)}.catalog-list{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:30px 22px;padding:18px 30px 40px}.catalog-item{display:block;text-align:left;padding:0;min-width:0}.catalog-spread{width:100%;aspect-ratio:176/125;display:flex;align-items:center;justify-content:center;gap:0;background:var(--ground);overflow:hidden}.catalog-spread img{width:50%;height:100%;object-fit:fill}.catalog-spread.is-single img{width:auto;max-width:50%;object-fit:contain}.catalog-item .catalog-caption{display:flex;gap:9px;margin-top:10px;align-items:baseline}.catalog-item .catalog-caption>span{font-size:11px;color:var(--muted);flex:none}.catalog-item strong{font:600 14px/1.7 var(--serif);font-weight:600}.catalog-item:hover .catalog-spread{outline:1px solid var(--accent);outline-offset:3px}#catalog-empty{padding:25px 30px 50px;color:var(--muted);font-size:13px}
.about-dialog{width:min(670px,calc(100vw - 60px))}.about-copy{padding:30px 35px 38px}.about-copy p{font-size:14px;line-height:2;color:var(--muted);margin-bottom:20px}.about-copy .about-lead{font:600 28px/1.6 var(--serif);color:var(--ink);margin-bottom:25px}.about-copy dl{margin-block:30px;font-size:12px}.about-copy dl>div{display:grid;grid-template-columns:100px 1fr;gap:20px;border-top:1px solid var(--line);padding-block:13px}.about-copy dt{color:var(--muted)}.about-copy dd{margin:0}.source-link{font-size:12px;display:inline-flex;align-items:center;gap:25px;min-height:44px}.source-link svg{width:16px}.download-links{display:grid;margin-top:25px}.download-links a{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding:13px 0;font-size:12px;min-height:44px}
.image-dialog{width:100vw;height:100dvh;max-height:none;margin:0;display:none;overflow:hidden}.image-dialog[open]{display:flex;flex-direction:column}.image-dialog .dialog-header{flex:none}.image-dialog .dialog-header h2{font-size:18px;flex:1}.image-paging{display:flex;align-items:center;gap:15px;font-size:12px;font-variant-numeric:tabular-nums}.flat-image-area{display:flex;flex:1;min-height:0;align-items:center;justify-content:center;padding:22px 50px;overflow:auto}.flat-image-area img{width:auto;height:auto;max-height:100%;max-width:100%;object-fit:contain}.image-footer{flex:none;display:flex;align-items:center;justify-content:center;gap:40px;padding:12px 30px 20px;font-size:12px}.image-footer p{color:var(--muted);max-width:600px;line-height:1.8}.noscript{position:fixed;bottom:50px;left:20px;right:20px;background:var(--panel);padding:18px;text-align:center}
@media(max-width:1000px){.reader-header{padding-inline:25px;height:67px}.reading-room{padding-inline:15px}.reader-dock{padding-inline:25px;gap:15px}.page-panel{width:290px;margin-left:10px;margin-right:0}.panel-copy{padding:20px}.panel-copy h2{font-size:25px}.catalog-list{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:760px){.reader-header{height:62px;padding-inline:18px;gap:17px}.reader-brand{font-size:18px;gap:7px}.reader-brand svg{width:17px;height:22px}.reader-header h1{padding-left:16px;font-size:11px}.reader-header nav{gap:10px}.reader-header nav button{font-size:12px;padding-inline:3px}.reader-header nav .icon-button{display:none}.reading-room{padding:0 8px}.reader-dock{height:67px;padding-inline:16px;gap:5px}.paging{gap:3px}.paging #page-index{min-width:64px;font-size:12px}.view-controls{gap:0;font-size:11px}.view-controls #view-reset{display:none}.view-controls #single-open{padding-inline:4px}.light-controls{gap:0}.light-controls button{min-width:40px;font-size:12px;padding-inline:5px}.light-controls button:after{left:5px!important;right:5px!important}.gesture-hint{height:28px;font-size:11px;padding-bottom:10px}.spread-captions{gap:14px;min-height:50px}.spread-captions button{gap:7px;max-width:47%;padding-inline:2px}.page-title{font-size:13px}.page-number{font-size:11px}.page-panel{position:absolute;bottom:0;left:6px;right:6px;width:auto;height:min(400px,48dvh);margin:0;z-index:8;box-shadow:0 -10px 30px rgb(16 28 36 / .1)}.panel-top{padding:8px 16px}.panel-copy{padding:18px 22px}.panel-copy h2{font-size:24px}.page-panel .geography{margin-bottom:6px}.panel-copy h2{margin-bottom:12px}.info-light{margin-block:10px 18px}dialog{width:100vw;max-height:100dvh;height:100dvh;margin:0;max-width:none}.dialog-header{padding:12px 17px;gap:12px}.dialog-header h2{font-size:21px}.catalog-toolbar{padding:18px;gap:10px;align-items:end}.catalog-toolbar label{min-width:0;flex:1;gap:10px}.catalog-toolbar p{font-size:11px;white-space:nowrap}.catalog-toolbar input{font-size:12px}.catalog-list{grid-template-columns:repeat(2,minmax(0,1fr));gap:25px 15px;padding:15px 18px 35px}.catalog-item strong{font-size:12px}.catalog-item .catalog-caption{display:block;margin-top:7px}.catalog-item .catalog-caption>span{display:block;margin-bottom:3px}.about-dialog{width:100vw}.about-copy{padding:25px}.about-copy .about-lead{font-size:25px}.image-dialog .dialog-header{flex-wrap:wrap;gap:0 10px}.image-dialog .dialog-header h2{font-size:16px;order:0}.image-dialog #image-close{order:1}.image-paging{order:2;width:100%;justify-content:space-between;gap:10px}.flat-image-area{padding:12px 15px}.image-footer{display:block;padding:0 22px 17px}.image-footer>.light-controls{justify-content:center}.image-footer p{text-align:center;font-size:12px;max-height:65px;overflow:auto;margin-top:8px}}
@media(max-width:380px){.reader-header h1{font-size:11px;padding-left:10px}.reader-header{gap:12px}.reader-header nav{gap:8px}.reader-dock{padding-inline:10px}.view-controls>button:not(.icon-button){min-width:38px}.paging #page-index{min-width:58px}.light-controls button{min-width:37px}.spread-captions .page-title{font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}}
.image-zoom{display:flex;align-items:center;gap:8px;font-size:15px}.image-zoom #image-fit{min-width:44px;font-size:12px;font-variant-numeric:tabular-nums}.flat-image-area{display:block;overscroll-behavior:contain}.flat-image-canvas{min-width:100%;min-height:100%;width:max-content;display:grid;place-items:center}.flat-image-area #flat-image{max-height:none;max-width:none;flex:none;user-select:none}.flat-image-area[data-zoomed=true]{cursor:grab}.flat-image-area.is-panning{cursor:grabbing}.reader-header nav button,.light-controls button,.info-light button,.view-controls,.paging #page-index{font-size:13px}.page-number{font-size:12px}.geography{font-size:12px}.panel-copy>p:not(.geography){font-size:14px}
@media(max-width:760px){.image-paging{width:calc(50% - 5px);gap:0;order:2}.image-zoom{width:calc(50% - 5px);justify-content:end;gap:0;order:3}.reader-header nav button{font-size:13px}.view-controls{font-size:12px}.page-title{font-size:14px}.reader-dock{padding-inline:12px}.light-controls button{min-width:42px}.image-dialog .dialog-header{gap:0 10px}}
@media(max-width:760px){.image-dialog .dialog-header h2{flex:1 0 calc(100% - 54px)}.image-dialog #image-close{margin-left:auto}}




/* One stop per spread: the native stepped thumb stays directly under the hand. */
.book-scrubber{flex:none;display:flex;align-items:center;gap:16px;width:min(520px,calc(100% - 48px));height:42px;margin:0 auto 4px;user-select:none;color:var(--muted)}
.scrub-end{font-size:10px;white-space:nowrap;letter-spacing:.08em}.scrub-track{position:relative;flex:1;min-width:0;height:42px;--stop:0%;--travel:0px}.scrub-ticks{position:absolute;inset:18px 8px auto;display:flex;justify-content:space-between;align-items:center;height:6px;pointer-events:none}.scrub-ticks span{width:1px;height:4px;background:var(--line)}.scrub-ticks span:nth-child(5n+1){height:7px}.scrub-ticks span.is-current{height:9px;background:var(--accent)}
#spread-scrubber{position:relative;margin:0;width:100%;height:42px;padding:0;appearance:none;-webkit-appearance:none;background:transparent;cursor:ew-resize;touch-action:pan-y pinch-zoom;vertical-align:top}
#spread-scrubber::-webkit-slider-runnable-track{height:1px;background:var(--line)}
#spread-scrubber::-moz-range-track{height:1px;background:var(--line)}
#spread-scrubber::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:16px;height:16px;margin-top:-7.5px;border:4px solid var(--ground);border-radius:50%;background:var(--accent);box-shadow:0 0 0 1px var(--accent)}
#spread-scrubber::-moz-range-thumb{box-sizing:border-box;width:16px;height:16px;border:4px solid var(--ground);border-radius:50%;background:var(--accent);box-shadow:0 0 0 1px var(--accent)}
#spread-scrubber:disabled{opacity:.35;cursor:default}#scrub-label{position:absolute;left:calc(8px + var(--travel));bottom:36px;transform:translateX(-50%);padding:2px 7px;background:var(--panel);border:1px solid var(--line);font-size:10px;line-height:1.8;font-variant-numeric:tabular-nums;white-space:nowrap;opacity:0;pointer-events:none}
.book-scrubber[data-active=true] #scrub-label,.book-scrubber:focus-within #scrub-label{opacity:1}.book-scrubber[data-active=true] .scrub-ticks span.is-current{height:13px}.book-scrubber[data-active=true] #spread-scrubber::-webkit-slider-thumb{border-width:3px}.book-scrubber[data-active=true] #spread-scrubber::-moz-range-thumb{border-width:3px}
.reader-dock{height:58px}.gesture-hint{height:27px;font-size:10px}.view-controls #rotate-toggle{white-space:nowrap;min-width:70px}
@media(max-width:760px){.reader-dock{height:54px;grid-template-columns:1fr auto 1fr}.book-scrubber{width:calc(100% - 40px);height:38px;margin-bottom:2px;gap:10px}.view-controls #rotate-toggle{min-width:64px;padding-inline:3px;font-size:11px}.view-controls #single-open{font-size:11px}.paging{gap:0}.paging #page-index{min-width:58px}.paging .icon-button{width:38px}.light-controls button{min-width:36px}.gesture-hint{font-size:10px;height:24px}.scrub-end{font-size:10px}}

/* v10: use viewport height for the object, with compact surrounding controls. */
.reader-header{height:64px}.spread-captions{min-height:40px}.reader-dock{height:50px}.gesture-hint{height:23px;padding-bottom:5px}.book-scrubber{height:40px;margin-bottom:0}
@media(min-width:761px){.reading-room{padding-inline:clamp(18px,2vw,32px)}}
@media(max-width:760px){.reader-header{height:58px}.spread-captions{min-height:42px}.reader-dock{height:50px}.gesture-hint{height:22px}.book-scrubber{height:38px}}
@media(max-height:600px) and (min-width:761px){.reader-header{height:48px}.spread-captions{min-height:36px}.spread-captions button{min-height:36px}.reader-dock{height:44px}.book-scrubber{height:34px}.gesture-hint{display:none}}

@media(max-width:380px){.reader-dock{height:88px;grid-template-columns:1fr 1fr;grid-template-rows:44px 44px;gap:0}.reader-dock .paging{grid-column:1 / -1;grid-row:1;justify-self:center}.reader-dock .light-controls{grid-column:1;grid-row:2}.reader-dock .view-controls{grid-column:2;grid-row:2;justify-self:end}}

/* Short landscape keeps the page-turn dock while moving the scrubber into unused header space. */
@media(max-height:420px) and (min-width:600px){.reader-header{height:44px}.reader-header h1{display:none}.spread-captions{display:none}.reader-dock{height:44px}.book-scrubber{position:absolute;top:0;left:50%;transform:translateX(-50%);width:min(300px,calc(100% - 320px));height:44px;margin:0;z-index:2}.book-scrubber #scrub-label{top:38px;bottom:auto}.gesture-hint{display:none}}

/* Continuous native page rail, with a separate enlarged-image panning surface. */
.flat-image-area[data-zoomed=false]{padding:0;overflow:hidden;touch-action:auto;cursor:grab}
.flat-page-rail{display:flex;width:100%;height:100%;overflow-x:auto;overflow-y:hidden;scroll-snap-type:x mandatory;overscroll-behavior-x:contain;scrollbar-width:none;touch-action:pan-x pan-y pinch-zoom;direction:ltr}
.flat-page-rail::-webkit-scrollbar{display:none}.flat-page-rail.is-programmatic{scroll-snap-type:none}.flat-page-rail.is-dragging{scroll-snap-type:none;cursor:grabbing;user-select:none}
.flat-page-cell{flex:0 0 100%;min-width:0;height:100%;display:flex;align-items:center;justify-content:center;padding:22px 50px;scroll-snap-align:center}
.flat-page-art{flex:none;background-repeat:no-repeat}.flat-page-cell img{max-width:100%;max-height:100%;width:100%;height:100%;object-fit:contain;user-select:none;-webkit-user-drag:none;pointer-events:none}
.flat-page-rail[hidden],.flat-image-canvas[hidden]{display:none!important}
.flat-image-area[data-zoomed=true]{touch-action:auto}.flat-image-area #flat-image{transition:none}
@media(max-width:760px){.flat-page-cell{padding:12px 15px}}
@media(max-width:760px){.view-controls #view-reset{display:inline-flex;width:44px;min-width:44px;height:44px;align-items:center;justify-content:center}}
@media(max-width:560px){.reader-dock{height:88px;grid-template-columns:1fr 1fr;grid-template-rows:44px 44px;gap:0}.reader-dock .paging{grid-column:1 / -1;grid-row:1;justify-self:center}.reader-dock .light-controls{grid-column:1;grid-row:2}.reader-dock .view-controls{grid-column:2;grid-row:2;justify-self:end}}