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55%);color:var(--rb-ink);padding-inline:.1em}.hero-actions{gap:var(--rb-space-3);margin-top:var(--rb-space-6);flex-wrap:wrap;display:flex}.hero .hero-actions{justify-content:center}.hero-meta{color:var(--rb-ink-subtle);font-size:var(--rb-text-xs);margin:var(--rb-space-4) 0 0;flex-wrap:wrap;gap:.25rem 0;padding:0;font-weight:550;list-style:none;display:flex}.hero .hero-meta{justify-content:center}.hero-meta li+li:before{content:"·";margin-inline:.55rem}.app-store-badge{margin:10px;line-height:0;display:inline-block}.app-store-badge img{width:auto;height:40px;display:block}.hero-ios{color:var(--rb-ink-subtle);font-size:var(--rb-text-xs);margin:0;font-weight:550}.hero-stores{align-items:flex-start;gap:var(--rb-space-3) var(--rb-space-6);margin-top:var(--rb-space-5);flex-wrap:wrap;justify-content:center;display:flex}.hero-store{flex-direction:column;align-items:center;display:flex}.hero .app-store-badge,.hero .slack-button{margin:0;padding:10px}.slack-button{margin:10px;line-height:0;display:inline-block}.slack-button img{width:auto;height:40px;display:block}.ai-app .slack-button{margin:0;padding:10px}.needs-grid .app-store-badge{margin:var(--rb-space-4) 0 0;padding:10px 10px 10px 0}.hero-visual{text-align:left;z-index:1;min-width:0;max-width:760px;margin:clamp(2.5rem,5vw,4rem) auto calc(-1*clamp(4rem,9vw,7rem));position:relative}.hero-visual .pocket-scene{max-width:760px}.hero-quotes{border-radius:inherit;z-index:0;pointer-events:none;position:absolute;inset:0;overflow:hidden}.hero-quote{background:var(--rb-hero-card);border:1px solid var(--rb-hero-card-line);color:var(--rb-ink);font-family:var(--rb-font-book);opacity:.62;text-align:left;border-radius:18px;width:15rem;padding:1.1rem 1.3rem;position:absolute;box-shadow:0 18px 40px -24px #21191559}.hero-quote b{font-family:var(--rb-font-display);font-size:.95rem;display:block}.hero-quote p{margin:.4rem 0 .6rem;font-size:.95rem;line-height:1.5}.hero-quote small{color:var(--rb-ink-subtle);font-family:var(--rb-font-mono);font-size:.75rem}.hero-quote-1{top:2.5rem;left:-2.5rem;rotate:-14deg}.hero-quote-2{top:24rem;left:-1rem;rotate:9deg}.hero-quote-3{top:6rem;right:-2rem;rotate:-10deg}.pocket-scene{width:100%;max-width:720px;margin-inline:auto;container-type:inline-size}.pocket-scene-inner{--u:calc(100cqw / 600);aspect-ratio:600/720;position:relative}.pocket-window{animation:tuck-in var(--rb-duration-slow) var(--rb-ease) both;left:calc(var(--u) * 34);top:calc(var(--u) * 6);width:calc(var(--u) * 480);position:absolute}.pocket-card{animation:tuck-in var(--rb-duration-slow) var(--rb-ease) .16s both;left:calc(var(--u) * 318);top:calc(var(--u) * 352);width:calc(var(--u) * 272);position:absolute;transform:rotate(4deg)}.pocket-front{--rb-pocket-fill:var(--rb-pocket);filter:drop-shadow(0 calc(var(--u) * -2) calc(var(--u) * 6) #21191533);width:100%;display:block;position:absolute;bottom:0;left:0}.pocket-body{fill:var(--rb-pocket-fill)}.pocket-shade stop{stop-color:var(--rb-brand-back)}.pocket-lip{fill:none;stroke:var(--rb-brand-cover);stroke-linecap:round;stroke-width:3px}.pocket-stitch{fill:none;stroke:var(--rb-pocket-seam);stroke-opacity:.75;stroke-dasharray:9 7;stroke-linecap:round;stroke-width:2.2px}.pocket-tack{stroke:var(--rb-brand-back);stroke-linecap:round;stroke-width:5px}.pocket-label rect{fill:var(--rb-pocket-label)}.pocket-label .pocket-label-stitch{fill:none;stroke:var(--rb-pocket-seam);stroke-dasharray:4 3;stroke-opacity:.55;stroke-width:1.2px}@keyframes tuck-in{0%{opacity:0;translate:0 calc(var(--u,1px) * -48)}to{opacity:1;translate:0}}.app-window{--u:calc(100cqw / 600);background:var(--rb-app-window);border:1px solid var(--rb-app-separator);border-radius:calc(var(--u) * 12);box-shadow:var(--rb-shadow-lg);color:var(--rb-app-text);font-family:var(--rb-font-app);font-size:calc(var(--u) * 11);line-height:1.35;overflow:hidden}.app-window svg{height:calc(var(--u) * 14);width:calc(var(--u) * 14)}.app-titlebar{background:var(--rb-app-toolbar);border-bottom:1px solid var(--rb-app-separator);align-items:center;gap:calc(var(--u) * 12);height:calc(var(--u) * 38);padding-inline:calc(var(--u) * 12);display:flex}.app-traffic{gap:calc(var(--u) * 6);display:inline-flex}.app-traffic i{height:calc(var(--u) * 10);width:calc(var(--u) * 10);background:#ff5f57;border-radius:50%}.app-traffic i:nth-child(2){background:#febc2e}.app-traffic i:nth-child(3){background:#28c840}.app-title{font-size:calc(var(--u) * 12);white-space:nowrap;font-weight:650}.app-tools{color:var(--rb-app-secondary);align-items:center;gap:calc(var(--u) * 11);margin-left:auto;display:inline-flex}.app-segmented{background:var(--rb-app-separator);border-radius:calc(var(--u) * 6);font-size:calc(var(--u) * 10);padding:calc(var(--u) * 2);display:inline-flex}.app-segmented>*{border-radius:calc(var(--u) * 4);padding:calc(var(--u) * 2) calc(var(--u) * 7)}.app-segmented b{background:var(--rb-app-surface);color:var(--rb-app-text);font-weight:550}.app-tool-label{font-size:calc(var(--u) * 10.5);align-items:center;gap:calc(var(--u) * 3);white-space:nowrap;display:inline-flex}.app-tool-label.is-prominent{background:var(--rb-app-tint);border-radius:calc(var(--u) * 6);color:#fff;padding:calc(var(--u) * 4) calc(var(--u) * 9);font-weight:600}.app-searchbar{background:var(--rb-app-toolbar);border-bottom:1px solid var(--rb-app-separator);align-items:center;gap:calc(var(--u) * 9);height:calc(var(--u) * 36);padding-inline:calc(var(--u) * 14);display:flex}.app-secondary{color:var(--rb-app-secondary)}.app-query{font-size:calc(var(--u) * 12);flex:1}.app-picker{color:var(--rb-app-tint);font-size:calc(var(--u) * 11);align-items:center;gap:calc(var(--u) * 2);display:inline-flex}.app-picker svg{height:calc(var(--u) * 10);width:calc(var(--u) * 10)}.app-clear{background:var(--rb-app-secondary);height:calc(var(--u) * 12);opacity:.55;width:calc(var(--u) * 12);border-radius:50%}.app-button{background:var(--rb-app-tint);border-radius:calc(var(--u) * 6);color:#fff;font-size:calc(var(--u) * 11);padding:calc(var(--u) * 4) calc(var(--u) * 11);font-weight:600}.app-canvas{background:var(--rb-app-canvas);padding:calc(var(--u) * 14) 0 0;justify-content:center;display:flex}.book-page{background:var(--rb-page);box-shadow:0 calc(var(--u) * 2) calc(var(--u) * 8) #0000002e;color:var(--rb-page-ink);font-family:var(--rb-font-book);height:calc(var(--u) * 404);padding:calc(var(--u) * 22) calc(var(--u) * 34) calc(var(--u) * 18);width:calc(var(--u) * 316);position:relative;overflow:hidden}.book-running-head{color:var(--rb-page-meta);font-size:calc(var(--u) * 6.5);letter-spacing:.04em;margin:0 0 calc(var(--u) * 10);font-weight:600}.book-text p{font-size:calc(var(--u) * 6.7);margin:0 0 calc(var(--u) * 4.2);line-height:2}.book-text .is-indented{text-indent:1em}.book-text .is-latin{font-family:"Fraunces Variable", var(--rb-font-book);font-variation-settings:"SOFT" 0;padding-left:calc(var(--u) * 6)}.book-page-en{font-variation-settings:"SOFT" 0;font-family:Fraunces Variable,Georgia,serif}.book-page-en .book-text p{font-size:calc(var(--u) * 9.2);-webkit-hyphens:auto;hyphens:auto;text-align:justify;margin-bottom:0;line-height:1.62}.book-page-en .book-text p+p{margin-top:0}.book-folio{bottom:calc(var(--u) * 12);color:var(--rb-page-meta);font-size:calc(var(--u) * 7);right:calc(var(--u) * 26);margin:0;position:absolute}.app-marker{background:var(--rb-app-marker);box-shadow:0 0 0 calc(var(--u) * 1.5) var(--rb-app-marker);color:inherit;border-radius:2px}.app-hitbar{background:var(--rb-app-hitbar);border-top:1px solid var(--rb-app-separator);color:var(--rb-app-tint);align-items:center;gap:calc(var(--u) * 10);padding:calc(var(--u) * 6) calc(var(--u) * 14);display:flex}.app-hitbar>span{flex:1;min-width:0;display:grid}.app-hitbar b{color:var(--rb-app-hit-text);font-size:calc(var(--u) * 10);font-weight:650}.app-hitbar small{color:var(--rb-app-secondary);font-size:calc(var(--u) * 9.5);text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.app-pagebar{background:var(--rb-app-toolbar);border-top:1px solid var(--rb-app-separator);color:var(--rb-app-tint);align-items:center;gap:calc(var(--u) * 12);height:calc(var(--u) * 34);padding-inline:calc(var(--u) * 14);display:flex}.app-page-indicator{color:var(--rb-app-text);font-size:calc(var(--u) * 11);font-variant-numeric:tabular-nums;min-width:calc(var(--u) * 54);text-align:center}.app-slider{background:linear-gradient(to right, var(--rb-app-tint) var(--progress), var(--rb-app-separator) var(--progress));height:calc(var(--u) * 3);border-radius:99px;flex:1;position:relative}.app-slider i{height:calc(var(--u) * 14);left:var(--progress);width:calc(var(--u) * 22);background:#fff;border-radius:99px;position:absolute;top:50%;translate:-50% -50%;box-shadow:0 1px 3px #00000059}.ai-card{--u:calc(100cqw / 600);background:var(--rb-paper-raised);border:1px solid var(--rb-line);border-radius:calc(var(--u) * 14);box-shadow:var(--rb-shadow-lg);color:var(--rb-ink);font-size:calc(var(--u) * 11.5);padding:calc(var(--u) * 14) calc(var(--u) * 16) calc(var(--u) * 16);line-height:1.5}.ai-card p{margin:0}.ai-card-app{color:var(--rb-ink-subtle);font-size:calc(var(--u) * 9.5);letter-spacing:.06em;text-transform:uppercase;font-weight:650}.ai-question{background:var(--rb-paper-sunken);border-radius:calc(var(--u) * 12) calc(var(--u) * 12) calc(var(--u) * 3) calc(var(--u) * 12);padding:calc(var(--u) * 7) calc(var(--u) * 11);width:fit-content;font-weight:550;margin:calc(var(--u) * 8) 0 calc(var(--u) * 9) auto!important}.ai-tool{color:var(--rb-ink-subtle);font-family:var(--rb-font-mono);font-size:calc(var(--u) * 9);align-items:center;gap:calc(var(--u) * 6);display:flex}.ai-tool-dot{background:var(--rb-success);height:calc(var(--u) * 6);width:calc(var(--u) * 6);border-radius:50%}.ai-answer{margin-top:calc(var(--u) * 6)!important}.ai-answer q{background:linear-gradient(transparent 62%, var(--rb-quote-mark) 62%)}.ai-citation{border:1px solid var(--rb-line-strong);border-radius:calc(var(--u) * 8);font-size:calc(var(--u) * 10);align-items:center;gap:calc(var(--u) * 8);padding:calc(var(--u) * 6) calc(var(--u) * 9) calc(var(--u) * 6) calc(var(--u) * 22);font-weight:600;display:flex;position:relative;overflow:hidden;margin-top:calc(var(--u) * 11)!important}.ai-open{color:var(--rb-accent);white-space:nowrap;margin-left:auto}.dog-ear{border-right:calc(var(--u) * 12) solid transparent;border-top:calc(var(--u) * 12) solid var(--rb-pocket);position:absolute;top:0;left:0}.section{padding-block:clamp(4.5rem,9vw,8rem)}.section-heading{max-width:46rem;margin-bottom:clamp(2.5rem,5vw,4rem)}.section-heading h2{font-size:var(--rb-text-2xl)}.section-heading>p:last-child:not(.eyebrow){color:var(--rb-ink-muted);font-size:var(--rb-text-lg);margin:var(--rb-space-4) 0 0;line-height:1.6}:lang(ja) .section-heading>p:last-child:not(.eyebrow){font-size:var(--rb-text-md);line-height:1.9}.steps-section{background:var(--rb-paper-raised);border-block:1px dashed var(--rb-line-strong)}.steps{counter-reset:step;gap:var(--rb-space-5);grid-template-columns:repeat(4,minmax(0,1fr));margin:0;padding:0;list-style:none;display:grid;position:relative}.steps:before{border-top:2px dashed var(--rb-stitch);content:"";position:absolute;top:7.5rem;left:4%;right:4%}.step{gap:var(--rb-space-5);flex-direction:column;display:flex;position:relative}.step-visual{aspect-ratio:1/.86;background:var(--rb-paper);border:1px solid var(--rb-line);border-radius:var(--rb-radius-lg);justify-content:center;align-items:center;padding:8%;display:flex;position:relative;overflow:hidden;container-type:inline-size}.step-visual>*{--u:calc(100cqw / 330);width:100%}.step-tag{color:var(--rb-ink-subtle);font-size:var(--rb-text-xs);align-items:center;gap:.6rem;margin:0 0 .45rem;font-weight:600;display:flex}.step-number{color:var(--rb-ink-subtle);font-family:var(--rb-font-mono);font-size:var(--rb-text-xs);margin:0;font-weight:600}.step-text h3{font-size:var(--rb-text-xl)}.step-text p:last-child{color:var(--rb-ink-muted);font-size:var(--rb-text-sm);margin:.6rem 0 0}.step-visual .app-window{--u:calc(100cqw / 330);box-shadow:var(--rb-shadow-md)}.library-window .app-titlebar{height:calc(var(--u) * 34)}.library-window .app-title{font-size:calc(var(--u) * 13)}.library-window .app-tools{gap:calc(var(--u) * 9)}.library-window .app-tool-label.is-prominent{font-size:calc(var(--u) * 10.5)}.library-grid{background:var(--rb-app-surface);gap:calc(var(--u) * 16);padding:calc(var(--u) * 16) calc(var(--u) * 18) calc(var(--u) * 18);grid-template-columns:repeat(2,1fr);display:grid}.library-book{gap:calc(var(--u) * 3);display:grid}.library-book b{font-size:calc(var(--u) * 11.5);margin-top:calc(var(--u) * 6)}.library-book small{color:var(--rb-app-secondary);font-size:calc(var(--u) * 9.5)}.sample-cover{aspect-ratio:3/4;background:var(--rb-sample-cover-bg);border-radius:calc(var(--u) * 4);box-shadow:0 calc(var(--u) * 3) calc(var(--u) * 10) #0000004d;gap:calc(var(--u) * 6);padding:calc(var(--u) * 10) calc(var(--u) * 10) calc(var(--u) * 10) calc(var(--u) * 8);display:flex}.sample-cover.is-empty{background:var(--rb-app-separator);box-shadow:none}.sample-cover-rule{background:var(--rb-sample-cover-rule);width:calc(var(--u) * 3)}.sample-cover-frame{color:#fff;padding:calc(var(--u) * 8);border:1px solid #ffffff2e;flex-direction:column;flex:1;justify-content:center;display:flex}.sample-cover-frame b{font-size:calc(var(--u) * 11);font-weight:700}.sample-cover-frame small{color:#ffffffbf;font-size:calc(var(--u) * 7.5);margin-top:calc(var(--u) * 4)}.sample-cover-frame em{color:var(--rb-sample-cover-label);font-family:var(--rb-font-mono);font-size:calc(var(--u) * 5.2);margin-top:auto;font-style:normal}.structure-visual{align-items:center;gap:calc(var(--u) * 18);grid-template-columns:calc(var(--u) * 120) 1fr;display:grid}.structure-page{aspect-ratio:3/4;background:var(--rb-page);border-radius:calc(var(--u) * 3);box-shadow:var(--rb-shadow-md);gap:calc(var(--u) * 7);padding:calc(var(--u) * 14) calc(var(--u) * 12);flex-direction:column;display:flex}.structure-page .box{border:1.5px solid var(--rb-brand-cover)}@supports (color:color-mix(in lab, red, red)){.structure-page .box{border:1.5px solid color-mix(in srgb, var(--rb-brand-cover) 70%, transparent)}}.structure-page .box{height:calc(var(--u) * 9);border-radius:2px;display:block}.structure-page .is-head{background:var(--rb-brand-ember)}@supports (color:color-mix(in lab, red, red)){.structure-page .is-head{background:color-mix(in srgb, var(--rb-brand-ember) 16%, transparent)}}.structure-page .is-head{border-color:var(--rb-brand-cover);height:calc(var(--u) * 13);border-width:2px;width:70%}.structure-page .is-short{width:64%}.structure-page .is-mid{width:82%}.structure-page .is-figure{background:var(--rb-brand-ink)}@supports (color:color-mix(in lab, red, red)){.structure-page .is-figure{background:color-mix(in srgb, var(--rb-brand-ink) 6%, transparent)}}.structure-page .is-figure{border-color:var(--rb-brand-ink)}@supports (color:color-mix(in lab, red, red)){.structure-page .is-figure{border-color:color-mix(in srgb, var(--rb-brand-ink) 55%, transparent)}}.structure-page .is-figure{height:calc(var(--u) * 46);border-style:dashed}.structure-legend{gap:calc(var(--u) * 14);margin:0;display:grid}.structure-legend dt{color:var(--rb-ink-subtle);font-size:calc(var(--u) * 10);letter-spacing:.04em;margin-bottom:calc(var(--u) * 5);font-weight:650}.structure-legend dd{border-left:2px dashed var(--rb-stitch);font-size:calc(var(--u) * 12);padding:calc(var(--u) * 2) 0 calc(var(--u) * 2) calc(var(--u) * 8);margin:0;font-weight:600}.step-visual .ai-card{--u:calc(100cqw / 300);box-shadow:var(--rb-shadow-md);transform:rotate(-1.5deg)}.page-crop{border-radius:calc(var(--u) * 10);box-shadow:var(--rb-shadow-md);overflow:hidden}.page-crop .book-page.is-crop{box-shadow:none;height:calc(var(--u) * 150);padding:calc(var(--u) * 16) calc(var(--u) * 22);width:100%}.page-crop .book-text p{font-size:calc(var(--u) * 12.5);margin-bottom:calc(var(--u) * 2)}.page-crop .book-page-en .book-text p{font-size:calc(var(--u) * 12.5);line-height:1.5}.page-crop .app-hitbar b{font-size:calc(var(--u) * 11)}.page-crop .app-hitbar small{font-size:calc(var(--u) * 10.5)}.page-crop .app-hitbar svg{height:calc(var(--u) * 14);width:calc(var(--u) * 14)}.ai-section{background:var(--rb-inverse-bg);color:var(--rb-inverse-ink)}.ai-section .eyebrow,.ai-section .section-heading>p:last-child:not(.eyebrow){color:var(--rb-inverse-muted)}.ai-grid{gap:var(--rb-space-5);grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.ai-way{border:1.5px dashed var(--rb-inverse-line);border-radius:var(--rb-radius-lg);gap:var(--rb-space-4);flex-direction:column;padding:clamp(1.5rem,3vw,2.5rem);display:flex}.ai-way h3{font-size:var(--rb-text-xl)}.ai-way>p{color:var(--rb-inverse-muted);margin:0}.ai-way code,.ai-app code{color:var(--rb-inverse-ink);background:#ffffff14}.ai-way-icon{border:1.5px solid var(--rb-inverse-line);border-radius:50%;justify-content:center;align-items:center;width:3rem;height:3rem;font-size:1.4rem;display:inline-flex;color:var(--rb-inverse-ink)!important}.ai-way-note{font-size:var(--rb-text-sm)}.ai-way-note a{color:var(--rb-inverse-accent);align-items:center;gap:.35rem;font-weight:600;text-decoration:none;display:inline-flex}.ai-way-note a:hover{text-decoration:underline}.ai-way-verified{font-size:var(--rb-text-sm);align-items:center;gap:.5rem;display:inline-flex}.ai-way-verified:before{background:var(--rb-success);content:"";border-radius:50%;width:.5rem;height:.5rem}.ai-apps{border-top:1px dashed var(--rb-inverse-line);margin-top:var(--rb-space-7);padding-top:var(--rb-space-6)}.ai-apps h3{font-size:var(--rb-text-lg)}.ai-apps ul{gap:var(--rb-space-4);margin:var(--rb-space-5) 0 0;grid-template-columns:repeat(2,minmax(0,1fr));padding:0;list-style:none;display:grid}.ai-app{border:1.5px solid var(--rb-inverse-line);border-radius:var(--rb-radius-lg);align-items:center;gap:var(--rb-space-4);padding:var(--rb-space-5);grid-template-columns:auto minmax(0,1fr) auto;display:grid}.ai-app h4{font-family:var(--rb-font-display);font-size:var(--rb-text-lg);font-variation-settings:"SOFT" 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