:root{color-scheme:light;--page: #f9f9f7;--surface-1: #fcfcfb;--text-primary: #0b0b0b;--text-secondary: #52514e;--text-muted: #898781;--grid: #e1e0d9;--baseline: #c3c2b7;--ghost: #6e6d68;--border: rgba(11, 11, 11, 0.1);--series-1: #2a78d6;--series-2: #008300;--series-3: #e87ba4;--seq: #256abf;--seq-track: #cde2fb;--accent-wash: rgba(42, 120, 214, 0.12);--v-classic: #eda100;--v-big: #1baf7a;--v-super: #4a3aa7;--div-over: #e34948;--div-under: #2a78d6;--cube-lit: #fffdf6;--cube: #efe8d8;--cube-shade: #ddd3bc;--cube-deep: #c4b99f;--cube-ink: #232c5e;--tray: #d9d5c9;--tray-hi: #f4f1e8;--tray-lo: #aca596;--tray-well: #a49d8c;--tray-well-edge: rgba(0, 0, 0, 0.42);--lift-neutral: #b6b1a4;--dead-zero: #b0b6bd;--dead-pole: #0d366b;--dead-ink-lo: #0b0b0b;--dead-ink-hi: #ffffff;--heat-zero: var(--dead-zero);--heat-pole: var(--dead-pole);--heat-ink-lo: var(--dead-ink-lo);--heat-ink-hi: var(--dead-ink-hi);--space-chapter: 96px;--space-section: 56px;--space-sub: 28px;--sticky-h: 68px}@media(prefers-color-scheme: dark){:root:where(:not([data-theme=light])){color-scheme:dark;--page: #0d0d0d;--surface-1: #1a1a19;--text-primary: #ffffff;--text-secondary: #c3c2b7;--text-muted: #898781;--grid: #2c2c2a;--baseline: #383835;--ghost: #6b6a66;--border: rgba(255, 255, 255, 0.1);--series-1: #3987e5;--series-2: #008300;--series-3: #d55181;--seq: #3987e5;--seq-track: #184f95;--accent-wash: rgba(57, 135, 229, 0.18);--v-classic: #c98500;--v-big: #199e70;--v-super: #9085e9;--div-over: #e66767;--div-under: #3987e5;--tray: #38362f;--tray-hi: #56534a;--tray-lo: #1b1a16;--tray-well: #17160f;--tray-well-edge: rgba(0, 0, 0, 0.7);--lift-neutral: #4c4a43;--dead-zero: #3f444b;--dead-pole: #86b6ef;--dead-ink-lo: #ffffff;--dead-ink-hi: #0b0b0b}}:root[data-theme=dark]{color-scheme:dark;--page: #0d0d0d;--surface-1: #1a1a19;--text-primary: #ffffff;--text-secondary: #c3c2b7;--text-muted: #898781;--grid: #2c2c2a;--baseline: #383835;--ghost: #6b6a66;--border: rgba(255, 255, 255, 0.1);--series-1: #3987e5;--series-2: #008300;--series-3: #d55181;--seq: #3987e5;--seq-track: #184f95;--accent-wash: rgba(57, 135, 229, 0.18);--v-classic: #c98500;--v-big: #199e70;--v-super: #9085e9;--div-over: #e66767;--div-under: #3987e5;--tray: #38362f;--tray-hi: #56534a;--tray-lo: #1b1a16;--tray-well: #17160f;--tray-well-edge: rgba(0, 0, 0, 0.7);--lift-neutral: #4c4a43;--dead-zero: #3f444b;--dead-pole: #86b6ef;--dead-ink-lo: #ffffff;--dead-ink-hi: #0b0b0b}*{box-sizing:border-box}body{margin:0;background:var(--page);color:var(--text-primary);font-family:system-ui,-apple-system,"Segoe UI",sans-serif;line-height:1.45}.wrap{max-width:1080px;margin:0 auto;padding:24px 20px 80px}#backdrop{position:fixed;inset:0;z-index:-1;pointer-events:none;width:100%;height:100%}header.hero{text-align:center;padding:28px 0 4px;position:relative}header.hero h1{font-size:46px;margin:0;letter-spacing:-0.02em}header.hero .tagline{color:var(--text-secondary);font-size:15.5px;max-width:620px;margin:10px auto 0}header.hero .byline{font-size:13.5px;color:var(--text-muted);margin:10px 0 0}header.hero .byline a{color:var(--text-secondary);text-decoration-color:var(--baseline)}header.hero .byline a:hover{color:var(--text-primary)}header.hero .dot{margin:0 8px}.finder-cta{display:inline-flex;align-items:center;gap:10px;margin:18px auto 0;max-width:520px;padding:11px 18px;border:1px solid var(--border);border-radius:12px;background:var(--surface-1);color:var(--text-secondary);font-size:14.5px;line-height:1.35;text-align:left;text-decoration:none;transition:border-color 140ms ease,color 140ms ease,transform 140ms ease}.finder-cta strong{color:var(--text-primary)}.finder-cta .finder-cta-icon{font-size:17px;flex:none}.finder-cta .finder-cta-arrow{color:var(--seq);font-weight:700;flex:none}.finder-cta:hover,.finder-cta:focus-visible{border-color:var(--seq);color:var(--text-primary);transform:translateY(-1px)}.finder-cta:focus-visible{outline:2px solid var(--seq);outline-offset:2px}@media(prefers-reduced-motion: reduce){.finder-cta{transition:none}}.theme-toggle{position:fixed;top:10px;right:10px;z-index:20;width:36px;height:36px;padding:0;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:50%;background:var(--surface-1);color:var(--text-primary);font-size:17px;line-height:1;cursor:pointer;box-shadow:0 1px 3px rgba(0,0,0,.16)}.theme-toggle:hover{border-color:var(--text-muted)}.theme-toggle:focus-visible{outline:2px solid var(--seq);outline-offset:2px}.theme-toggle.spin{animation:themeSpin 320ms ease}@keyframes themeSpin{from{transform:rotate(-90deg) scale(0.7)}to{transform:rotate(0) scale(1)}}@media(prefers-reduced-motion: reduce){.theme-toggle.spin{animation:none}}.hero-boards{margin-top:28px}.hero-board-row{display:flex;gap:16px;justify-content:center;align-items:stretch;flex-wrap:wrap}.hero-board{background:var(--surface-1);border:1px solid var(--border);border-radius:12px;border-top:3px solid var(--vc, var(--border));padding:12px 16px 10px;display:flex;flex-direction:column;align-items:center;gap:8px}.hero-board .vtag{align-self:flex-start}.hero-board .word-now{min-height:24px;font-size:15px;font-weight:600;letter-spacing:.04em;display:flex;align-items:center;gap:8px}.hero-board .board-stats{font-size:12px;color:var(--text-muted)}p.note.center{text-align:center;margin:14px auto 0}.vtag{display:inline-flex;align-items:center;gap:7px;font-size:12.5px;font-weight:600;color:var(--text-secondary)}.vtag::before{content:"";width:14px;height:5px;border-radius:2.5px;background:var(--vc, var(--baseline))}.pts{font-size:11.5px;font-weight:600;color:var(--text-secondary);background:color-mix(in srgb, var(--vc, var(--seq)) 14%, transparent);border:1px solid color-mix(in srgb, var(--vc, var(--seq)) 35%, transparent);border-radius:999px;padding:1px 8px;white-space:nowrap;font-variant-numeric:tabular-nums}.btray{--tray-tint: color-mix(in srgb, var(--vc, var(--baseline)) 16%, var(--tray));width:max-content;padding:calc(var(--cell, 46px)*.15);border-radius:calc(var(--cell, 46px)*.26);background:linear-gradient(158deg, color-mix(in srgb, var(--tray-hi) 52%, var(--tray-tint)) 0%, var(--tray-tint) 44%, color-mix(in srgb, var(--tray-lo) 48%, var(--tray-tint)) 100%);box-shadow:inset 0 1.5px 0 hsla(0,0%,100%,.5),inset 0 -1.5px 0 rgba(0,0,0,.22),inset 0 0 0 1px rgba(0,0,0,.12),0 2px 7px rgba(0,0,0,.2)}.bboard{position:relative;width:max-content}.bboard .bgrid{display:grid;gap:4px}.bboard .cell{width:var(--cell, 52px);height:var(--cell, 52px);border:0;border-radius:calc(var(--cell, 52px)*.1);background:var(--tray-well);position:relative;box-shadow:inset 0 1.5px 2.5px var(--tray-well-edge),inset 0 -1px 0 hsla(0,0%,100%,.12)}.bboard .cell .step{position:absolute;top:1px;right:3px;font-size:9px;font-weight:700;color:var(--cube-ink);opacity:.7;font-variant-numeric:tabular-nums;text-shadow:0 0 2px var(--cube-lit),0 0 3px var(--cube-lit)}.cubeface{border-radius:calc(var(--cell, 46px)*.2);background:radial-gradient(ellipse 120% 100% at 50% 22%, var(--cube-lit) 0%, var(--cube) 46%, var(--cube-shade) 100%);box-shadow:inset 0 calc(var(--cell, 46px)*.05) calc(var(--cell, 46px)*.075) calc(var(--cell, 46px)*-0.04) hsla(0,0%,100%,.95),inset 0 calc(var(--cell, 46px)*-0.065) calc(var(--cell, 46px)*.09) calc(var(--cell, 46px)*-0.045) var(--cube-deep),inset 0 0 0 1px rgba(140,128,100,.28),0 calc(var(--cell, 46px)*.035) calc(var(--cell, 46px)*.06) rgba(0,0,0,.33);color:var(--cube-ink);font-family:Arial,Helvetica,"Helvetica Neue",sans-serif;font-weight:700;font-size:calc(var(--cell, 46px)*.56);line-height:1;display:flex;align-items:center;justify-content:center}.cubeface.f2{font-size:calc(var(--cell, 46px)*.44);letter-spacing:-0.015em}.cubeface .glyph{display:inline-block;position:relative}.cubeface .glyph.underlined::after{content:"";position:absolute;left:-0.03em;right:-0.03em;bottom:.115em;height:.088em;background:currentColor;border-radius:.03em}.cubeface .stopmark{width:40%;height:40%;border-radius:14%;background:var(--cube-ink);opacity:.92}.bboard .cell .cubeface{position:absolute;inset:calc(var(--cell, 46px)*.05);transform:rotate(var(--jit, 0deg))}.bboard .cell.lit{box-shadow:inset 0 1.5px 2.5px var(--tray-well-edge),0 0 0 2px color-mix(in srgb, var(--vc, var(--seq)) 72%, transparent)}.bboard .cell.lit .cubeface{background:linear-gradient(color-mix(in srgb, var(--vc, var(--seq)) 26%, transparent) 0 100%),radial-gradient(ellipse 120% 100% at 50% 22%, var(--cube-lit) 0%, var(--cube) 46%, var(--cube-shade) 100%)}.btray.tiny{padding:3px;border-radius:7px}.btray.tiny .bboard .cell{border-radius:3px;box-shadow:inset 0 1px 1.5px var(--tray-well-edge)}.btray.tiny .cubeface{box-shadow:inset 0 1px 1px hsla(0,0%,100%,.9),inset 0 -1px 1px var(--cube-deep),0 1px 1.5px rgba(0,0,0,.3)}.btray.tiny .bboard .cell .cubeface{inset:1px}.btray.tiny .cubeface.f2{font-size:calc(var(--cell, 46px)*.42)}.bboard svg.trace{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;overflow:visible}.bboard .pencil{fill:none;stroke:var(--vc, var(--seq));stroke-width:3.2;stroke-linecap:round;stroke-linejoin:round;opacity:.82}section.algo{margin-top:34px}section.algo h2{font-size:18px;margin:0 0 8px}section.algo p{font-size:14px;color:var(--text-secondary);margin:0 0 8px;max-width:820px}section.algo ul{margin:0;padding-left:20px;font-size:14px;color:var(--text-secondary)}section.algo li{margin:5px 0;max-width:800px}section.algo strong{color:var(--text-primary)}section.rules{margin-top:34px}section.rules h2{font-size:18px;margin:0 0 8px}section.rules>p{font-size:14px;color:var(--text-secondary);margin:0 0 14px;max-width:820px}section.rules strong{color:var(--text-primary)}.rules-grid{display:grid;grid-template-columns:minmax(0, auto) minmax(260px, 1fr);gap:22px;align-items:start}@media(max-width: 780px){.rules-grid{grid-template-columns:minmax(0, 1fr);gap:16px}}.score-scroll{min-width:0;overflow-x:auto;-webkit-overflow-scrolling:touch}.score-table{border-collapse:collapse;font-size:13px;font-variant-numeric:tabular-nums}.score-table caption{caption-side:top;text-align:left;font-size:12px;color:var(--text-muted);padding-bottom:6px}.score-table th,.score-table td{padding:5px 9px;border-bottom:1px solid var(--grid);text-align:center}.score-table thead th{color:var(--text-muted);font-weight:600;font-size:11.5px}.score-table tbody th{text-align:left;font-weight:600;color:var(--text-primary);white-space:nowrap;display:flex;align-items:center;gap:7px}.score-table tbody tr:last-child th,.score-table tbody tr:last-child td{border-bottom:0}.score-table td{color:var(--text-secondary)}.score-table td.none{color:var(--text-muted)}.score-table td.hi{color:var(--text-primary);font-weight:600;white-space:nowrap}.vdot{width:9px;height:9px;border-radius:3px;background:var(--vc);flex:none}.score-table tr[data-v=classic]{--vc: var(--v-classic)}.score-table tr[data-v=big]{--vc: var(--v-big)}.score-table tr[data-v=super]{--vc: var(--v-super)}.rules-notes{margin:0;padding-left:20px;font-size:13.5px;color:var(--text-secondary)}.rules-notes li{margin:0 0 8px}.rules-notes li:last-child{margin-bottom:0}section.rules .note{margin-top:14px}section{margin-top:var(--space-section)}section[id],.chapter{scroll-margin-top:var(--sticky-h)}.chapter+section{margin-top:20px}section>.card+.card{margin-top:var(--space-sub)}section>h2{font-size:18px;margin:0 0 4px}section>p.note{color:var(--text-secondary);font-size:13.5px;margin:2px 0 14px;max-width:760px}p.note.trivia{margin-top:12px}.chapter{margin-top:var(--space-chapter);padding-top:22px;border-top:1px solid var(--border)}.chapter-num{display:block;font-size:11.5px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--text-muted)}.chapter-title{font-size:25px;line-height:1.15;letter-spacing:-0.015em;margin:5px 0 0;color:var(--text-primary)}.toc{margin-top:34px;padding:18px 20px 20px;border:1px solid var(--border);border-radius:12px;background:var(--surface-1)}.toc-title{font-size:11.5px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--text-muted);margin:0 0 14px}.toc-grid{list-style:none;margin:0;padding:0;display:grid;gap:18px 24px;grid-template-columns:repeat(3, minmax(0, 1fr))}@media(min-width: 1000px){.toc-grid{grid-template-columns:repeat(5, minmax(0, 1fr))}}.toc-ch{min-width:0}.toc-ch-link{display:block;text-decoration:none;font-size:14.5px;font-weight:600;line-height:1.3;color:var(--text-primary)}.toc-ch-link:hover,.toc-ch-link:focus-visible{text-decoration:underline}.toc-num{display:block;font-size:10.5px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--text-muted);margin-bottom:2px}.toc-subs{list-style:none;margin:8px 0 0;padding:0}.toc-subs li{margin:0 0 4px}.toc-subs a{text-decoration:none;font-size:13px;line-height:1.35;color:var(--text-secondary)}.toc-subs a:hover,.toc-subs a:focus-visible{color:var(--text-primary);text-decoration:underline}#backToTop{position:fixed;right:18px;bottom:18px;z-index:6;width:40px;height:40px;padding:0;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:50%;background:var(--surface-1);color:var(--text-secondary);cursor:pointer;opacity:0;pointer-events:none;transition:opacity 180ms ease;box-shadow:0 1px 3px rgba(0,0,0,.16)}#backToTop.is-visible{opacity:1;pointer-events:auto}#backToTop:hover{color:var(--text-primary)}#backToTop svg{width:20px;height:20px;display:block}@media(prefers-reduced-motion: reduce){#backToTop{transition:none}}.sect-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px}.sect-head h2{font-size:18px;margin:0 0 4px}.card-head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;flex-wrap:wrap}.showsel{display:inline-flex;align-items:center;gap:6px;white-space:nowrap}.showsel .sel-label{font-size:12px;color:var(--text-muted)}.showsel select{border:1px solid var(--border);background:var(--surface-1);color:var(--text-secondary);border-radius:7px;padding:3px 6px;font:inherit;font-size:12.5px;cursor:pointer}.card{background:var(--surface-1);border:1px solid var(--border);border-radius:12px;padding:16px}.count-cards{display:grid;gap:12px}.count-card{border-left:4px solid var(--vc, var(--border));min-width:0}.count-card .head{display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}.count-card .head .grid-size{font-size:12.5px;color:var(--text-muted)}.count-card .bignum{overflow-x:auto;white-space:nowrap;margin:8px 0 2px;font-size:clamp(18px,3.2vw,30px);font-weight:600;letter-spacing:.01em;font-variant-numeric:tabular-nums;scrollbar-width:thin;padding-bottom:4px}.count-card .sci{font-size:13px;color:var(--text-secondary)}.count-card .eternity{font-size:13px;color:var(--text-secondary);margin-top:6px}.count-card .eternity strong{color:var(--text-primary)}.tiles{display:grid;grid-template-columns:repeat(auto-fit, minmax(210px, 1fr));gap:12px}.tile .label{font-size:13px;color:var(--text-secondary)}.tile .value{font-size:30px;font-weight:600;margin-top:2px}.tile .value small{font-size:15px;font-weight:500;color:var(--text-secondary)}.tile .detail{font-size:12.5px;color:var(--text-muted);margin-top:4px}.tile.v-accent{border-top:3px solid var(--vc, var(--border))}.filters{display:flex;gap:18px;flex-wrap:wrap;align-items:center;margin:18px 0 6px;position:sticky;top:0;z-index:5;background:var(--page);padding:10px 0}.seg{display:inline-flex;border:1px solid var(--border);border-radius:9px;overflow:hidden;background:var(--surface-1)}.seg button{border:0;background:rgba(0,0,0,0);color:var(--text-secondary);font:inherit;font-size:13.5px;padding:7px 14px;cursor:pointer;display:inline-flex;align-items:center;gap:7px}.seg button .swatch{width:9px;height:9px;border-radius:3px;background:var(--vc, var(--baseline))}.seg button+button{border-left:1px solid var(--border)}.seg button.on{background:color-mix(in srgb, var(--vc, var(--seq)) 13%, transparent);color:var(--text-primary);font-weight:600}.seg button:focus-visible{outline:2px solid var(--vc, var(--text-primary));outline-offset:-3px;border-radius:6px}.fgroup{display:flex;align-items:center;gap:10px;min-width:0}.filters .flabel{font-size:12.5px;color:var(--text-muted)}.seg-txt{display:inline-flex;align-items:baseline;gap:4.5px;min-width:0}.seg-name-sm{display:none}.champ-note{font-size:15px;color:var(--text-secondary);margin:4px 0 14px;max-width:760px}.champ-note strong{color:var(--text-primary)}.xtreme-row{display:grid;grid-template-columns:repeat(auto-fit, minmax(280px, 1fr));gap:12px;align-items:stretch}.xcard{border-top:3px solid var(--vc);display:flex;flex-direction:column;align-items:center;gap:10px;min-width:0}.xhead{display:flex;justify-content:space-between;align-items:center;gap:8px;width:100%;flex-wrap:wrap}.xstats{font-size:14px;color:var(--text-secondary);font-variant-numeric:tabular-nums}.xstats strong{color:var(--text-primary);font-size:17px}.xwords-head{font-size:12px;color:var(--text-muted);width:100%;text-align:center}.xwords{width:100%;height:208px;overflow-y:auto;overscroll-behavior:contain;border:1px solid var(--border);border-radius:8px;background:var(--surface-2, transparent);display:flex;flex-direction:column;position:relative}.xwords:focus-visible{outline:2px solid var(--vc);outline-offset:2px}.xword{border:0;border-bottom:1px solid var(--grid);background:rgba(0,0,0,0);color:var(--text-primary);font:inherit;font-size:12.5px;cursor:pointer;text-align:left;display:flex;justify-content:space-between;align-items:baseline;gap:8px;padding:4px 10px}.xword:last-child{border-bottom:0}.xword:hover{background:var(--accent-wash)}.xword.on{background:color-mix(in srgb, var(--vc) 15%, transparent);font-weight:600;box-shadow:inset 3px 0 0 var(--vc)}.xword .xw{overflow:hidden;text-overflow:ellipsis}.xword .cpts{color:var(--text-muted);font-size:11px;font-variant-numeric:tabular-nums;white-space:nowrap}.chips{display:flex;flex-wrap:wrap;gap:6px;justify-content:center}.chip{border:1px solid var(--border);background:rgba(0,0,0,0);color:var(--text-primary);border-radius:999px;padding:3px 10px;font:inherit;font-size:12.5px;cursor:pointer;display:inline-flex;gap:6px;align-items:baseline}.chip:hover{background:var(--accent-wash)}.chip.on{background:color-mix(in srgb, var(--vc) 14%, transparent);border-color:color-mix(in srgb, var(--vc) 45%, transparent);font-weight:600}.chip .cpts{color:var(--text-muted);font-size:11px;font-variant-numeric:tabular-nums}.dud{display:flex;gap:12px;align-items:center;justify-content:center;border-top:1px dashed var(--grid);padding-top:10px;width:100%;margin-top:auto}.dud .board-caption{text-align:left;max-width:180px;margin:0}.scale-seg button{padding:4px 10px;font-size:12px}.anno-title{font-size:11.5px;font-weight:600;fill:var(--text-primary)}.anno{font-size:11.5px;fill:var(--text-secondary);font-variant-numeric:tabular-nums}.tiles.rarity{margin-top:12px}#scoreSection 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solid var(--seq);outline-offset:2px}.pm-go{background:color-mix(in srgb, var(--seq) 13%, transparent);border-color:color-mix(in srgb, var(--seq) 35%, transparent);color:var(--text-primary);font-weight:600}.pm-help{font-size:12.5px;color:var(--text-muted);margin:0}.pm-help,.pm-err{overflow-wrap:anywhere}.pm-err{font-size:13px;color:var(--div-over);margin:0;min-height:1.2em}.pm-body{display:flex;flex-wrap:wrap;gap:18px;align-items:flex-start}.pm-boardwrap{flex:0 0 auto;margin:0 auto}.pm-facts{flex:1 1 300px;min-width:0;display:flex;flex-direction:column;gap:12px}.pm-fact{display:flex;flex-direction:column;gap:4px;min-width:0}.pm-fact-lab{font-size:12px;color:var(--text-muted);display:flex;align-items:center;gap:7px;flex-wrap:wrap}.pm-num{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12.5px;line-height:1.55;color:var(--text-primary);overflow-wrap:anywhere;word-break:break-all;min-width:0}.pm-hex{color:var(--text-secondary)}.pm-bytes{font-size:11px;padding:1px 7px;border-radius:999px;background:var(--accent-wash);color:var(--seq);border:1px solid color-mix(in srgb, var(--seq) 30%, transparent);cursor:help}.pm-bytes:focus-visible{outline:2px solid var(--seq);outline-offset:2px}.pm-share{display:flex;gap:7px;align-items:stretch;min-width:0}#pmLink{flex:1 1 auto;min-width:0;box-sizing:border-box;border:1px solid var(--border);border-radius:9px;background:var(--page);color:var(--text-secondary);padding:8px 10px;font-size:12px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;text-overflow:ellipsis}#pmLink:focus-visible{outline:2px solid var(--seq);outline-offset:1px}.pm-copy{flex:0 0 auto;padding:8px 13px;font-size:13px}.pm-copy.copied{color:var(--series-2);border-color:color-mix(in srgb, var(--series-2) 45%, transparent);background:color-mix(in srgb, var(--series-2) 10%, transparent)}.pm-offscreen{position:fixed;left:-9999px;top:0;opacity:0}@media(max-width: 640px){.pm-controls{gap:8px}.pm-btns{width:100%}.pm-btns .pm-btn{flex:1 1 auto;text-align:center;padding:9px 8px}.pm-body{gap:14px}.pm-boardwrap{width:100%;display:flex;justify-content:center}}@media(max-width: 640px){:root{--space-chapter: 64px;--space-section: 40px;--space-sub: 20px;--sticky-h: 168px}.chapter-title{font-size:21px}.toc-grid{grid-template-columns:1fr;gap:12px}.toc-subs{display:none}#backToTop{right:14px;bottom:14px}}