.bubu-page{--bubu-blue:#263f53;--bubu-soft:#e3e9e9;--bubu-rule:#ccd5d4}
.bubu-page .site-shell{width:min(calc(100% - 120px),1040px)}
.bubu-page p{font-size:16px;line-height:1.8}
.bubu-page h1,.bubu-page h2,.bubu-page h3{font-family:var(--serif);font-weight:500;letter-spacing:-.025em;text-wrap:pretty}
.bubu-page h2{font-size:clamp(29px,3vw,37px);line-height:1.2;margin-bottom:24px}
.bubu-page h3{font-size:25px;line-height:1.3;margin-bottom:18px}
.bubu-intro{padding:100px 0 52px}
.bubu-intro h1{font-size:clamp(48px,5.5vw,70px);line-height:1.1;margin:20px 0}
.bubu-intro .bubu-subtitle{max-width:760px;font-family:var(--serif);font-size:clamp(27px,3vw,38px);line-height:1.25;letter-spacing:-.025em;margin-bottom:54px}
.bubu-overview{display:grid;grid-template-columns:1.35fr 1fr;gap:64px;align-items:start}
.bubu-prose p{margin-bottom:22px}
.bubu-prose .bubu-outcome-line{padding-left:20px;border-left:2px solid var(--bubu-blue);color:var(--bubu-blue);margin-top:30px;margin-bottom:0}
.bubu-facts{margin:0;border-top:1px solid var(--line)}
.bubu-facts>div{display:grid;grid-template-columns:84px 1fr;gap:18px;padding:18px 0;border-bottom:1px solid var(--line);font-size:14px;line-height:1.6}
.bubu-facts dt{color:var(--accent);font-weight:500}.bubu-facts dd{margin:0}.bubu-facts a{text-decoration:underline;text-underline-offset:4px}
.bubu-product-preview{margin:0 0 54px}
.bubu-browser-bar{display:flex;justify-content:space-between;align-items:center;padding:14px 20px;border:1px solid var(--bubu-rule);border-bottom:0;border-radius:14px 14px 0 0;background:var(--bubu-soft);color:#536872;font-size:11px}
.bubu-browser-bar>span:first-child{letter-spacing:3px;font-size:8px}
.bubu-product-preview img{width:100%;height:auto;border-radius:0 0 12px 12px;border:1px solid var(--bubu-rule)}
.bubu-product-preview figcaption{padding-top:14px;font-size:12px}
.bubu-contents{display:flex;flex-wrap:wrap;gap:18px 30px;padding:22px 0;border-block:1px solid var(--line);margin-bottom:100px;font-size:13px;color:var(--green)}
.bubu-contents a:hover,.bubu-source:hover,.bubu-back:hover{text-decoration:underline;text-underline-offset:5px}
.bubu-section{padding-bottom:115px;scroll-margin-top:35px}
.bubu-section-heading{max-width:740px;margin-bottom:42px}
.bubu-section-heading>p:last-child{margin-bottom:0}
.bubu-context-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:34px}
.bubu-context-grid>div{border-top:1px solid var(--line);padding-top:22px;display:flex;flex-direction:column;align-items:flex-start}
.bubu-context-number{font-size:11px;color:var(--muted);margin-bottom:22px}
.bubu-context-grid h3{font-size:23px}
.bubu-context-grid p{font-size:15px;line-height:1.8}
.bubu-source{font-size:11px;line-height:1.6;color:var(--muted);margin-top:auto}
.bubu-page .bubu-note{font-size:12px;line-height:1.7;color:var(--muted);margin:26px 0 0;max-width:860px}
.bubu-page .bubu-design-question{max-width:800px;font-family:var(--serif);font-size:28px;line-height:1.4;color:var(--bubu-blue);margin:36px 0 44px}
.bubu-journey{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:28px}
.bubu-journey li{position:relative;border-top:2px solid var(--bubu-rule);padding-top:20px}
.bubu-journey li:not(:last-child):after{content:'→';position:absolute;right:-20px;top:-13px;color:var(--muted)}
.bubu-journey li>span{font-size:11px;color:var(--muted)}
.bubu-journey h3{font-size:22px;margin:20px 0 12px}.bubu-journey p{font-size:14px;margin:0}
.bubu-page .bubu-reconstruction-note{margin:-16px 0 36px}
.bubu-design-row{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center;padding:44px 0;border-top:1px solid var(--line)}
.bubu-design-row:last-child{padding-bottom:0}
.bubu-row-index{display:block;margin-bottom:20px;font-size:11px;color:var(--muted);letter-spacing:.08em;text-transform:uppercase}
.bubu-design-copy h4{margin:24px 0 6px;color:var(--green);font-size:12px;font-weight:600}
.bubu-design-copy p{font-size:15px;margin:0}
.bubu-schematic{margin:0;padding:32px;border:1px solid var(--bubu-rule);border-radius:18px;background:var(--bubu-soft);color:var(--bubu-blue)}
.bubu-ui-heading{display:flex;align-items:center;gap:10px;margin-bottom:28px;font-size:12px}.bubu-star{font-size:23px}
.bubu-schematic .bubu-ui-prompt{font-family:var(--serif);font-size:25px;line-height:1.3;margin-bottom:24px}
.bubu-ui-field{display:flex;justify-content:space-between;gap:12px;align-items:center;background:#f7f8f4;border:1px solid #bbc8cc;border-radius:10px;min-height:68px;padding:16px;font-size:13px;line-height:1.6}
.bubu-ui-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px;font-size:10px}.bubu-ui-chips span{border:1px solid #b8c6cb;border-radius:50px;padding:7px 12px}
.bubu-ui-action{display:flex;justify-content:space-between;align-items:center;border-radius:10px;margin-top:25px;padding:14px 18px;background:var(--bubu-blue);color:#fff;font-size:12px}
.bubu-schematic figcaption{border-top:1px solid #bfcacb;margin-top:28px;padding-top:15px;color:#5d6e73;font-size:10px;line-height:1.6}
.bubu-card-fan{display:flex;justify-content:center;align-items:center;gap:12px;padding:22px 0}
.bubu-card-fan>div{display:grid;place-items:center;position:relative;width:28%;aspect-ratio:2 / 3;background:var(--bubu-blue);border:4px double #c4b79b;border-radius:8px;color:#e8dec7;font-size:32px;transform:rotate(-9deg)}
.bubu-card-fan>div:last-child{transform:rotate(9deg)}
.bubu-card-fan .bubu-chosen{transform:translateY(-10px);background:#f4f0e7;color:var(--bubu-blue)}
.bubu-chosen span{position:absolute;bottom:12px;font-size:9px}.bubu-schematic .bubu-ui-status{font-size:12px;text-align:center;margin:14px 0 0}
.bubu-reading-heading{font-family:var(--serif);font-size:28px;margin-bottom:22px}.bubu-text-lines{display:grid;gap:10px}.bubu-text-lines i{height:5px;background:#adbfc5;border-radius:2px}.bubu-text-lines i:last-child{width:66%}
.bubu-reflection-prompt{font-size:13px;line-height:1.7;border-left:2px solid #8da6b1;padding-left:14px;margin:28px 0}
.bubu-delivery-grid{display:grid;grid-template-columns:1fr 1.4fr;gap:72px}
.bubu-launch{padding:34px;background:#e8e6dc;border-radius:16px}
.bubu-launch strong{font-family:var(--serif);font-size:48px;font-weight:500;color:var(--bubu-blue);line-height:1.1}.bubu-launch strong span{display:block;font-family:var(--sans);font-size:12px;margin-top:12px;color:var(--ink)}
.bubu-launch p{font-size:14px;margin:20px 0 0}.bubu-launch-divider{display:block;color:var(--muted);padding:28px 0;font-size:24px}
.bubu-delivery-list{list-style:none;counter-reset:delivery;padding:0;margin:0}.bubu-delivery-list li{position:relative;counter-increment:delivery;padding:0 0 25px 38px}.bubu-delivery-list li:before{content:'0' counter(delivery);position:absolute;left:0;top:3px;font-size:11px;color:var(--muted)}
.bubu-delivery-list strong{font-size:15px;font-weight:500}.bubu-delivery-list p{font-size:14px;margin:8px 0 0}.bubu-delivery-list li:last-child{padding-bottom:0}
.bubu-metrics{display:grid;grid-template-columns:.85fr .9fr 1.3fr 1.2fr;gap:24px;margin:0 0 48px;padding:28px 0 32px;border-block:1px solid var(--line)}
.bubu-metrics>div{display:flex;flex-direction:column;gap:18px;min-width:0}.bubu-metrics dt{font-size:12px;line-height:1.5;color:var(--muted);order:2;max-width:200px}.bubu-metrics dd{margin:0;color:var(--bubu-blue);font-family:var(--serif);font-size:36px;letter-spacing:-.04em;white-space:nowrap}.bubu-metrics dd span{font-size:22px}
.bubu-results-detail{display:grid;grid-template-columns:1fr 1fr;gap:70px}.bubu-results-detail h3{font-size:23px}.bubu-results-detail p{font-size:15px}
.bubu-completion-chart{margin:0}.bubu-bar-row{display:flex;align-items:center;gap:16px;margin-top:20px;font-size:12px}.bubu-bar-row>span{width:44px;flex:none}.bubu-bar-track{flex:1;background:#e2e2d8;border-radius:5px;overflow:hidden}.bubu-bar-track>div{padding:10px 12px;background:#acb9bc;color:#233b48;text-align:right;font-size:12px}.bubu-bar-track>.bubu-bar-after{background:var(--bubu-blue);color:#fff}.bubu-completion-chart figcaption{font-size:12px;margin-top:18px}
.bubu-reflection-row{display:grid;grid-template-columns:270px 1fr;gap:64px;padding:32px 0;border-top:1px solid var(--line)}
.bubu-reflection-row h3{font-size:23px;margin:0}.bubu-reflection-row p{margin:0;font-size:15px}
.bubu-page .bubu-closing{max-width:740px;margin:70px auto 34px;text-align:center;font-family:var(--serif);font-size:25px;line-height:1.45;color:var(--bubu-blue)}
.bubu-final-actions{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:24px}
.bubu-button{display:inline-flex;padding:14px 22px;border-radius:50px;background:var(--bubu-blue);color:var(--paper);font-size:14px;font-weight:500}.bubu-button:hover{background:var(--green);color:var(--paper)}.bubu-back{font-size:13px;color:var(--green)}
@media(max-width:1000px){.bubu-overview{gap:36px}.bubu-context-grid{gap:24px}.bubu-design-row,.bubu-results-detail{gap:36px}.bubu-schematic{padding:25px}.bubu-delivery-grid{gap:40px}.bubu-metrics dd{font-size:30px}.bubu-metrics dd span{font-size:18px}.bubu-reflection-row{grid-template-columns:220px 1fr;gap:40px}}
@media(max-width:800px){.bubu-page .site-shell{width:calc(100% - 64px)}.bubu-overview{grid-template-columns:1fr;gap:38px}.bubu-context-grid{grid-template-columns:1fr;gap:32px}.bubu-context-grid p{max-width:640px}.bubu-context-number{margin-bottom:14px}.bubu-journey{grid-template-columns:1fr 1fr;gap:28px 36px}.bubu-journey li:after{display:none}.bubu-metrics{grid-template-columns:1fr 1fr;gap:32px}.bubu-metrics dd{font-size:36px}.bubu-design-row{gap:30px}.bubu-card-fan{gap:8px}}
@media(max-width:600px){.bubu-page .site-shell{width:calc(100% - 48px)}.bubu-page p{font-size:15px}.bubu-intro{padding-top:70px;padding-bottom:38px}.bubu-intro .bubu-subtitle{font-size:29px;margin-bottom:36px}.bubu-facts>div{font-size:13px}.bubu-contents{gap:16px 22px;margin-bottom:70px}.bubu-section{padding-bottom:80px}.bubu-section-heading{margin-bottom:32px}.bubu-page .bubu-design-question{font-size:24px}.bubu-journey h3{font-size:21px}.bubu-journey p{font-size:13px}.bubu-design-row{grid-template-columns:1fr;gap:28px;padding-block:32px}.bubu-design-copy h3{font-size:25px}.bubu-delivery-grid,.bubu-results-detail{grid-template-columns:1fr;gap:36px}.bubu-launch{padding:30px}.bubu-launch strong{font-size:42px}.bubu-reflection-row{grid-template-columns:1fr;gap:18px}.bubu-reflection-row h3{font-size:24px}.bubu-page .bubu-closing{font-size:23px;margin-top:50px}.bubu-closing br{display:none}.bubu-final-actions{flex-direction:column;gap:24px}.bubu-product-preview figcaption{font-size:11px}.bubu-metrics{gap:30px 18px}.bubu-metrics dd{font-size:30px}.bubu-metrics dt{font-size:11px}.bubu-metrics dd span{font-size:17px}}
@media(max-width:360px){.bubu-metrics dd{font-size:27px}.bubu-journey{grid-template-columns:1fr}}

/* Product walkthrough: original interfaces, with room to read. */
.bubu-screen{margin:0;min-width:0}
.bubu-screen>a{display:block;position:relative;border-radius:12px;background:#e6eae7;padding:20px;overflow:hidden;cursor:zoom-in}
.bubu-screen img{display:block;width:100%;height:auto;aspect-ratio:var(--screen-ratio,1.85);object-fit:contain}
.bubu-screen figcaption{font-size:12px;line-height:1.7;color:var(--muted);padding:15px 2px 0;max-width:860px}
.bubu-enlarge{display:block;text-align:right;font-size:10px;letter-spacing:.04em;color:var(--bubu-blue);margin-top:6px}
.bubu-screen>a:hover{background:#dce3e1}
.bubu-screen>a:focus-visible,.bubu-tab-controls button:focus-visible,.bubu-lightbox button:focus-visible{outline:2px solid var(--bubu-blue);outline-offset:5px}
.bubu-hero-screen{margin-bottom:54px}
.bubu-hero-screen>a{padding:36px 28px 16px;background:#e1e7e8}
.bubu-page .bubu-evidence-note{margin:-16px 0 30px;max-width:760px}
.bubu-feature-nav{display:flex;flex-wrap:wrap;gap:12px 26px;font-size:12px;border-block:1px solid var(--line);padding:22px 0;margin-bottom:64px;color:var(--bubu-blue)}
.bubu-feature-nav a:hover{text-decoration:underline;text-underline-offset:5px}
.bubu-feature{scroll-margin-top:35px;margin-top:90px}
.bubu-feature:first-of-type{margin-top:0}
.bubu-feature-heading{display:grid;grid-template-columns:.85fr 1.15fr;gap:72px;margin-bottom:30px;align-items:start}
.bubu-feature-heading h3{font-size:30px;max-width:340px;margin:0;line-height:1.25}
.bubu-feature-heading .bubu-row-index{margin-bottom:16px}
.bubu-feature-heading p{font-size:15px;line-height:1.8;margin:0 0 16px}
.bubu-feature-heading strong{display:block;font-size:11px;letter-spacing:.04em;color:var(--bubu-blue);margin-bottom:5px;font-weight:600}
.bubu-feature-heading p:last-child{margin-bottom:0}
.bubu-screen-pair{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:start}
.bubu-screen-pair .bubu-screen>a{padding:18px 12px 10px}
.bubu-more-screens{border-bottom:1px solid var(--line);margin-top:28px}
.bubu-more-screens summary{display:flex;justify-content:space-between;gap:20px;cursor:pointer;list-style:none;font-size:13px;padding:18px 0;color:var(--bubu-blue)}
.bubu-more-screens summary::-webkit-details-marker{display:none}
.bubu-more-screens[open] summary>span{transform:rotate(45deg)}
.bubu-more-screens .bubu-screen-pair{padding:12px 0 28px}
.bubu-tab-controls{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}
.bubu-tab-controls[hidden],[data-panel][hidden]{display:none}
.bubu-tab-controls button{font:inherit;font-size:12px;background:transparent;border:1px solid var(--bubu-rule);color:var(--bubu-blue);padding:10px 17px;border-radius:30px;cursor:pointer}
.bubu-tab-controls button[aria-selected="true"]{background:var(--bubu-blue);color:var(--paper);border-color:var(--bubu-blue)}
.bubu-draw-sequence [data-panel]+[data-panel]{margin-top:24px}
.bubu-draw-sequence:has([role="tablist"]) [data-panel]{margin-top:0}
.bubu-detail-feature{display:grid;grid-template-columns:2.1fr 1fr;gap:40px;align-items:center;margin-top:40px}
.bubu-side-note h4,.bubu-share-heading h4{font-family:var(--serif);font-weight:500;font-size:24px;line-height:1.3;margin:0 0 16px}
.bubu-side-note p{font-size:14px;margin:0}
.bubu-share-heading{max-width:680px;margin:52px auto 28px;text-align:center}
.bubu-share-heading p{font-size:15px;margin:0}
.bubu-share-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.bubu-share-cards .bubu-screen>a{padding:22px 18px 10px;background:#e8e5dd}
.bubu-share-cards img{aspect-ratio:var(--screen-ratio,.58)}
.bubu-share-cards figcaption{text-align:center;font-size:11px}
.bubu-lightbox{border:1px solid var(--bubu-rule);border-radius:14px;padding:0;background:var(--paper);color:var(--ink);width:calc(100vw - 56px);max-width:1600px;height:calc(100dvh - 56px);max-height:100dvh;overflow:hidden}
.bubu-lightbox::backdrop{background:rgba(11,23,32,.83)}
.bubu-lightbox[open]{display:flex;flex-direction:column}
.bubu-lightbox-toolbar{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:18px 22px;border-bottom:1px solid var(--line);flex:none}
.bubu-page .bubu-lightbox-toolbar h2{font-family:var(--sans);font-size:12px;letter-spacing:0;line-height:1.5;margin:0;max-width:700px}
.bubu-lightbox-toolbar>div{display:flex;align-items:center;gap:10px;flex:none}
.bubu-lightbox button,.bubu-lightbox-toolbar a{font:inherit;font-size:12px;color:var(--bubu-blue);border:1px solid var(--bubu-rule);background:transparent;border-radius:24px;padding:9px 14px;cursor:pointer;white-space:nowrap}
.bubu-lightbox-stage{flex:1;min-height:0;overflow:auto;padding:24px;display:grid;place-items:center;background:#e6eae7;overscroll-behavior:contain}
.bubu-lightbox-stage img{width:100%;height:100%;object-fit:contain;min-height:0}
.bubu-lightbox.is-zoomed .bubu-lightbox-stage{display:block}
.bubu-lightbox.is-zoomed img{width:auto;height:auto;max-width:none;max-height:none}
.bubu-modal-open{overflow:hidden}
@media(max-width:1000px){.bubu-feature-heading{gap:42px}.bubu-detail-feature{grid-template-columns:1.7fr 1fr;gap:28px}.bubu-lightbox-toolbar{align-items:flex-start}.bubu-lightbox-toolbar h2{max-width:450px}}
@media(max-width:800px){.bubu-screen-pair{grid-template-columns:1fr;gap:30px}.bubu-feature-heading{grid-template-columns:1fr;gap:22px}.bubu-feature-heading h3{max-width:550px}.bubu-feature-heading>div:last-child{max-width:680px}.bubu-detail-feature{grid-template-columns:1fr}.bubu-side-note{max-width:600px}.bubu-share-cards{gap:14px}.bubu-share-cards .bubu-screen>a{padding:12px 8px 8px}.bubu-lightbox-toolbar{flex-direction:column;gap:12px}}
@media(max-width:600px){.bubu-feature{margin-top:64px}.bubu-feature-nav{margin-bottom:42px;gap:15px 22px}.bubu-feature-heading h3{font-size:27px}.bubu-screen>a,.bubu-hero-screen>a{padding:18px 8px 8px}.bubu-screen figcaption{font-size:11px}.bubu-enlarge{font-size:9px}.bubu-share-cards{grid-template-columns:1fr;max-width:280px;margin-inline:auto;gap:30px}.bubu-share-cards .bubu-screen>a{padding:22px 20px 12px}.bubu-tab-controls{gap:6px}.bubu-tab-controls button{padding:10px 11px;font-size:11px}.bubu-lightbox{width:calc(100vw - 20px);height:calc(100dvh - 32px)}.bubu-lightbox-toolbar{padding:14px}.bubu-lightbox-toolbar>div{gap:8px;flex-wrap:wrap}.bubu-lightbox button,.bubu-lightbox-toolbar a{font-size:11px;padding:9px 12px}.bubu-lightbox-stage{padding:12px}}

/* A quieter reading rhythm and clear entry points for a first-time reader. */
.bubu-intro{padding-bottom:76px}
.bubu-overview{gap:88px}
.bubu-prose p{max-width:500px;margin-bottom:30px}
.bubu-prose strong{color:var(--bubu-blue);font-weight:600}
.bubu-prose .bubu-outcome-line{margin-top:42px;padding:10px 0 10px 26px}
.bubu-outcome-line>strong{display:block;font-family:var(--serif);font-size:46px;line-height:1.15;letter-spacing:-.035em;font-weight:500}
.bubu-outcome-line>span{display:block;font-size:12px;margin-top:16px;line-height:1.7}
.bubu-facts>div{padding:22px 0}
.bubu-hero-screen{margin-bottom:76px}
.bubu-section{padding-bottom:160px}
.bubu-section-heading{max-width:680px;margin-bottom:60px}
.bubu-section-heading>p:last-child{max-width:620px}
.bubu-context-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:80px}
.bubu-context-grid>div{padding-top:36px}
.bubu-context-stat{font-family:var(--serif);font-size:68px;line-height:1.05;letter-spacing:-.04em;color:var(--accent);margin-bottom:28px}
.bubu-context-grid h3{font-size:25px;margin-bottom:20px}
.bubu-context-grid p{max-width:380px;margin-bottom:28px}
.bubu-opportunity{margin-top:56px;padding:34px 40px;background:#e7ebe5;border-left:2px solid var(--bubu-blue);border-radius:0 12px 12px 0}
.bubu-opportunity .bubu-row-index{margin-bottom:16px}
.bubu-opportunity h3{margin-bottom:16px}
.bubu-opportunity p{max-width:760px;margin:0;font-size:15px}
.bubu-opportunity strong{font-weight:400;color:var(--muted)}
.bubu-page .bubu-note{margin-top:34px;max-width:760px}
.bubu-journey{gap:40px}
.bubu-journey li{padding-top:28px}
.bubu-journey li:not(:last-child):after{right:-26px}
.bubu-page .bubu-design-question{margin:0 0 60px;max-width:730px}
.bubu-page .bubu-evidence-note{margin:-28px 0 42px}
.bubu-feature-nav{padding-block:26px;margin-bottom:80px;gap:18px 36px}
.bubu-feature{margin-top:132px}
.bubu-feature-heading{gap:88px;margin-bottom:52px;grid-template-columns:1fr 1fr}
.bubu-feature-heading h3{max-width:340px}
.bubu-feature-heading p{margin-bottom:26px;max-width:440px}
.bubu-feature-heading strong{font-size:13px;margin-bottom:10px}
.bubu-screen-pair{gap:56px}
.bubu-screen figcaption{padding-top:22px;max-width:760px}
.bubu-more-screens{margin-top:40px}
.bubu-more-screens .bubu-screen-pair{padding:24px 0 40px}
.bubu-detail-feature{gap:60px;margin-top:64px}
.bubu-share-heading{margin:80px auto 42px;max-width:590px}
.bubu-share-cards{gap:40px}
.bubu-tab-controls{margin-bottom:28px;gap:14px}
.bubu-delivery-grid,.bubu-results-detail{gap:88px}
.bubu-launch{padding:44px}
.bubu-launch-divider{padding-block:40px}
.bubu-delivery-list li{padding-bottom:36px}
.bubu-metrics{grid-template-columns:repeat(2,minmax(0,1fr));gap:48px 80px;padding-block:42px;margin-bottom:64px}
.bubu-metrics>div{gap:20px}
.bubu-metrics dd{font-size:48px;line-height:1.2}
.bubu-metrics dd span{font-size:26px}
.bubu-metrics dt{font-size:13px;max-width:280px}
.bubu-results-detail p strong{color:var(--bubu-blue)}
.bubu-reflection-row{gap:88px;padding-block:44px}
.bubu-page .bubu-closing{margin-top:88px;margin-bottom:44px}
.bubu-stage-nav{gap:13px;max-height:calc(100dvh - 48px);overflow-y:auto;scrollbar-width:thin}
.bubu-stage-nav .bubu-substage{font-weight:400}
.bubu-stage-nav .bubu-substage i{transform:scale(.65)}
.bubu-stage-nav .bubu-substage.is-active i{transform:scale(.9)}
.bubu-stage-nav .bubu-substage.is-active{font-weight:700}
@media(min-width:1100px){
  .bubu-page .bubu-case{width:min(calc(100% - 260px),1040px);margin-left:max(60px,calc((100% - 1200px)/2));margin-right:auto}
  .bubu-stage-nav{right:18px;width:130px}
  .bubu-stage-nav a{font-size:11px;gap:12px;min-height:23px}
  .bubu-stage-nav a span{display:inline}
  .bubu-contents{display:none}
  .bubu-hero-screen{margin-bottom:140px}
}
@media(max-width:1099px){.bubu-overview,.bubu-feature-heading,.bubu-delivery-grid,.bubu-results-detail{gap:52px}.bubu-stage-nav{right:10px;width:12px}.bubu-stage-nav a span{display:none}.bubu-context-grid{gap:52px}.bubu-reflection-row{gap:48px}.bubu-screen-pair{gap:40px}.bubu-metrics{gap:40px 52px}.bubu-detail-feature{gap:36px}}
@media(max-width:800px){.bubu-overview{gap:48px}.bubu-feature-heading{gap:30px}.bubu-feature-heading p{max-width:640px}.bubu-section{padding-bottom:120px}.bubu-feature{margin-top:100px}.bubu-section-heading{margin-bottom:48px}.bubu-share-cards{gap:24px}.bubu-launch{padding:32px}.bubu-delivery-grid{grid-template-columns:1fr;gap:48px}.bubu-results-detail{grid-template-columns:1fr;gap:48px}.bubu-reflection-row{grid-template-columns:1fr;gap:24px}}
@media(max-width:600px){.bubu-context-grid{grid-template-columns:1fr;gap:48px}.bubu-context-stat{font-size:60px}.bubu-opportunity{padding:28px;margin-top:44px}.bubu-intro{padding-bottom:54px}.bubu-outcome-line>strong{font-size:40px}.bubu-section{padding-bottom:100px}.bubu-feature{margin-top:90px}.bubu-feature-heading{margin-bottom:38px}.bubu-section-heading{margin-bottom:42px}.bubu-journey{gap:36px}.bubu-share-cards{gap:40px}.bubu-share-heading{margin-top:60px}.bubu-screen-pair{gap:44px}.bubu-detail-feature{margin-top:48px}.bubu-metrics{gap:36px 24px;padding-block:32px}.bubu-metrics dd{font-size:32px}.bubu-metrics dd span{font-size:18px}.bubu-metrics dt{font-size:11px}.bubu-tab-controls{gap:8px}.bubu-reflection-row{padding-block:34px}.bubu-page .bubu-closing{margin-top:64px}.bubu-stage-nav{display:none}}

/* Problem framing: typography carries the hierarchy, without UI cards. */
.bubu-challenge{padding-bottom:112px}
.bubu-challenge .bubu-section-heading{max-width:870px;margin-bottom:42px}
.bubu-challenge h2{max-width:820px;font-size:clamp(30px,3vw,40px);line-height:1.2;margin-bottom:24px}
.bubu-challenge .bubu-section-heading>p:last-child{max-width:690px}
.bubu-challenge-columns{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:56px}
.bubu-challenge-columns>div{border-top:1px solid var(--line);padding-top:24px}
.bubu-challenge-columns .bubu-row-index{font-size:11px;line-height:1.5;margin:0 0 12px}
.bubu-challenge-columns h3{font-size:clamp(34px,3.2vw,43px);line-height:1.12;margin:0 0 24px;color:var(--bubu-blue)}
.bubu-challenge-columns h4{font-family:var(--sans);font-size:16px;font-weight:600;line-height:1.45;margin:0 0 12px;color:var(--ink)}
.bubu-challenge-columns p:last-child{font-size:15px;line-height:1.75;margin:0}
.bubu-context-grid .bubu-row-index{margin-bottom:22px}
.bubu-context-grid .bubu-context-stat{margin:8px 0 20px}
.bubu-page .bubu-stat-label{font-size:14px;font-weight:500;color:var(--bubu-blue);line-height:1.65;margin-bottom:24px;max-width:360px}
.bubu-deck-gallery{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:44px 32px}
.bubu-deck-card>a{padding:0;border-radius:0;background:transparent;overflow:visible}
.bubu-deck-card>a:hover{background:transparent}
.bubu-deck-card img{aspect-ratio:2 / 3;object-fit:contain;object-position:bottom}
.bubu-deck-card .bubu-enlarge{margin-top:12px;text-align:left}
.bubu-deck-card figcaption{font-family:var(--serif);font-size:19px;color:var(--bubu-blue);padding-top:12px}
@media(max-width:1000px){.bubu-challenge-columns{gap:34px}.bubu-deck-gallery{gap:36px 24px}}
@media(max-width:700px){.bubu-challenge-columns{grid-template-columns:1fr;gap:32px}.bubu-challenge{padding-bottom:100px}.bubu-deck-gallery{grid-template-columns:repeat(2,minmax(0,1fr));gap:34px 22px}.bubu-deck-card figcaption{font-size:18px}.bubu-deck-card>a{padding:0}}

/* Design has two chapters: the visual language, then five experience stages. */
.bubu-design-parts{display:flex;gap:36px;flex-wrap:wrap;border-block:1px solid var(--line);padding:24px 0;margin-bottom:72px;color:var(--bubu-blue);font-size:13px}
.bubu-design-parts a:hover{text-decoration:underline;text-underline-offset:5px}
.bubu-identity{margin-top:0}
.bubu-part-heading{max-width:700px;margin-bottom:60px}
.bubu-part-heading h3{font-size:34px;line-height:1.25;margin-bottom:24px}
.bubu-part-heading p{max-width:630px;margin-bottom:0}
.bubu-style-block+.bubu-style-block{margin-top:110px}
.bubu-style-block .bubu-feature-heading h3{font-size:28px}
.bubu-deck-card img{border-radius:18px;aspect-ratio:auto;object-fit:contain}
.bubu-deck-card>a{border-radius:18px}
.bubu-cardback-feature{display:grid;grid-template-columns:220px 1fr;gap:68px;align-items:center;margin-top:64px;max-width:850px}
.bubu-cardback-feature h4,.bubu-payment-detail h4{font-family:var(--serif);font-size:27px;line-height:1.25;font-weight:500;margin:0 0 20px}
.bubu-cardback-feature p{max-width:500px;font-size:15px}
.bubu-palette{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}
.bubu-palette>div{background:var(--swatch);min-height:150px;display:flex;align-items:flex-end;padding:22px;color:#f4f0e7;border-radius:8px}
.bubu-palette span{font-size:12px}
.bubu-palette .bubu-swatch-light{color:#263f53}
.bubu-interface-examples{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:start}
.bubu-interface-examples .bubu-screen>a{position:relative;height:420px;overflow:hidden;padding:0;background:#102337;border-radius:12px}
.bubu-interface-examples img{position:absolute;height:auto;max-width:none;aspect-ratio:auto}
.bubu-interface-dialog img{width:290%;left:-155%;top:-8%}
.bubu-interface-history img{width:440%;left:-26%;top:-9%}
.bubu-interface-examples .bubu-screen>a{max-width:300px;height:480px;margin-inline:auto}
.bubu-interface-examples figcaption{max-width:340px;margin-inline:auto}
.bubu-interface-history img{width:400%;left:-22%;top:-3%}
.bubu-experience-flow{margin-top:140px;scroll-margin-top:40px}
.bubu-experience-flow>.bubu-feature:first-of-type{margin-top:0}
.bubu-payment-detail{display:grid;grid-template-columns:1fr 1.6fr;gap:64px;align-items:center;margin-top:70px}
.bubu-payment-detail p{font-size:15px;max-width:360px}
.bubu-more-screens>.bubu-screen{max-width:760px;margin:28px auto 40px}
.bubu-outcome-delivery{margin-top:44px}
.bubu-outcome-delivery .bubu-delivery-grid{padding-block:32px 44px}
.bubu-lightbox .bubu-rounded-card{border-radius:22px}
@media(max-width:1000px){.bubu-interface-examples{gap:32px}.bubu-interface-examples .bubu-screen>a{height:340px}.bubu-cardback-feature{gap:40px}.bubu-payment-detail{gap:40px}.bubu-palette>div{padding:18px}}
@media(max-width:800px){.bubu-interface-examples .bubu-screen>a{height:300px}.bubu-payment-detail{grid-template-columns:1fr}.bubu-payment-detail p{max-width:620px}.bubu-cardback-feature{grid-template-columns:180px 1fr}.bubu-palette{grid-template-columns:repeat(2,minmax(0,1fr))}.bubu-experience-flow{margin-top:110px}}
@media(max-width:680px){.bubu-page .header-inner{padding-left:52px}.bubu-page .site-name{font-size:16px}.bubu-page .site-nav{gap:18px}.bubu-part-heading h3{font-size:29px}.bubu-style-block+.bubu-style-block{margin-top:80px}.bubu-cardback-feature{grid-template-columns:1fr;gap:30px}.bubu-cardback-feature>.bubu-screen{max-width:220px;margin-inline:auto}.bubu-interface-examples{grid-template-columns:1fr;gap:36px}.bubu-interface-examples .bubu-screen>a{height:380px}.bubu-deck-card img,.bubu-deck-card>a{border-radius:12px}.bubu-palette>div{min-height:120px}.bubu-part-heading{margin-bottom:44px}.bubu-design-parts{gap:24px;margin-bottom:52px}.bubu-experience-flow{margin-top:100px}}
@media(min-width:681px) and (max-width:1099px){.bubu-page .header-inner{padding-left:40px}}
.bubu-interface-examples .bubu-screen>a{height:480px}
.bubu-interface-examples .bubu-screen>a{height:auto;max-width:none;padding:18px 12px;background:#e6eae7}
.bubu-interface-examples img{position:static;width:100%;max-width:100%;height:auto;left:auto;top:auto}
.bubu-interface-examples figcaption{max-width:none}

/* Cards attach to the page edge; chosen artwork appears on the right. */
.bubu-deck-explorer{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:24px;height:640px;padding:0;margin-left:calc(-1 * var(--deck-gutter,0px));width:calc(100% + var(--deck-gutter,0px));border:0;border-radius:0;background:transparent;color:var(--bubu-blue)}
.bubu-deck-explorer .bubu-deck-eyebrow{display:block;font-family:var(--sans);font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);line-height:1.5}
.bubu-deck-reveal{display:flex;flex-direction:column;align-items:center;justify-content:center;min-width:0;gap:18px}
.bubu-deck-guide{width:min(100%,300px);text-align:left}
.bubu-deck-explorer .bubu-deck-guide h5{margin:20px 0 16px;font-family:var(--serif);font-size:40px;line-height:1.2;font-weight:500;letter-spacing:-.025em;color:var(--bubu-blue)}
.portfolio-case.bubu-page main .bubu-deck-guide p{margin:0;font-size:14px;line-height:1.6;color:var(--muted)}
.bubu-deck-explorer.has-revealed .bubu-deck-guide h5{font-size:26px;margin:9px 0 8px}
.bubu-deck-explorer.has-revealed .bubu-deck-guide{width:min(100%,220px)}
.portfolio-case.bubu-page main .bubu-deck-explorer.has-revealed .bubu-deck-guide p{font-size:12px}
.bubu-deck-result{width:min(100%,210px);margin:0;text-align:center}
.bubu-deck-result[hidden]{display:none}
.bubu-deck-result>a{display:block;box-shadow:none;background:transparent}
.bubu-deck-result img{display:block;width:100%;height:auto;aspect-ratio:2 / 3;border-radius:14px}
.portfolio-case.bubu-page .bubu-deck-explorer .bubu-deck-result figcaption{padding-top:14px;color:var(--bubu-blue);font-size:21px;line-height:1.2}
.bubu-deck-result-title{display:block;color:var(--bubu-blue)}
.bubu-deck-explorer .bubu-deck-result-meta{display:block;margin-top:6px;font-family:var(--sans);font-size:11px;line-height:1.6;color:var(--muted)}
.bubu-deck-stepper{display:flex;align-items:center;gap:18px;font-family:var(--sans);font-size:11px;font-variant-numeric:tabular-nums;letter-spacing:.08em;color:var(--bubu-blue)}
.bubu-deck-stepper[hidden]{display:none}
.bubu-deck-stepper button{width:34px;height:34px;border:1px solid var(--bubu-rule);border-radius:50%;background:transparent;color:var(--bubu-blue);cursor:pointer}
.bubu-deck-stepper button:hover{background:#263f5311}
.bubu-deck-browser{display:flex;flex-direction:column;min-height:0;min-width:0;text-align:center;gap:12px}
.bubu-deck-rail{flex:1;min-height:0;overflow-y:auto;overflow-x:hidden;overscroll-behavior-y:contain;scrollbar-width:thin;scrollbar-color:#bba77d transparent;isolation:isolate}
.bubu-deck-arc{position:sticky;top:0;height:100%;overflow:hidden}
.bubu-deck-pick{position:absolute;display:block;left:0;top:0;width:var(--arc-card-width,112px);aspect-ratio:2 / 3;margin:0;padding:0;border:1px solid #dbc29244;border-radius:8px;background:#102337;cursor:pointer;transform:translate(var(--arc-x,0),var(--arc-y,0)) translate(-50%,-50%) rotate(var(--arc-angle,0deg));box-shadow:0 2px 7px #08142344;transition:filter .18s ease}
.bubu-deck-pick img{display:block;width:100%;height:100%;border-radius:inherit;pointer-events:none}
.bubu-deck-pick>span{position:absolute;left:9px;top:7px;font-family:var(--sans);font-size:8px;letter-spacing:.04em;color:#e4cd99;pointer-events:none}
.bubu-deck-pick:hover,.bubu-deck-pick:focus-visible{filter:brightness(1.3)}
.bubu-deck-pick[aria-pressed="true"]{outline:2px solid #f7d28c;outline-offset:1px;filter:brightness(1.2)}
.bubu-deck-pick:focus-visible,.bubu-deck-stepper button:focus-visible,.bubu-deck-result>a:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.bubu-deck-scroll-hint{font-family:var(--sans);font-size:10px;color:var(--muted);letter-spacing:.06em;font-variant-numeric:tabular-nums}
@media(max-width:1000px){.bubu-deck-explorer{gap:18px;height:600px}.bubu-deck-result{max-width:194px}.bubu-deck-explorer .bubu-deck-guide h5{font-size:32px}.bubu-deck-explorer.has-revealed .bubu-deck-guide h5{font-size:24px}}
@media(max-width:700px){.bubu-deck-explorer{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:12px;height:500px;padding:0;border-radius:0}.bubu-deck-reveal{gap:14px}.bubu-deck-explorer .bubu-deck-eyebrow{font-size:9px;letter-spacing:.04em}.bubu-deck-explorer .bubu-deck-guide h5{font-size:25px;margin:14px 0 12px}.portfolio-case.bubu-page main .bubu-deck-guide p{font-size:12px}.bubu-deck-explorer.has-revealed .bubu-deck-guide h5{font-size:19px}.portfolio-case.bubu-page main .bubu-deck-explorer.has-revealed .bubu-deck-guide p{font-size:11px}.bubu-deck-result{max-width:146px}.portfolio-case.bubu-page .bubu-deck-explorer .bubu-deck-result figcaption{font-size:17px;padding-top:12px}.bubu-deck-explorer .bubu-deck-result-meta{font-size:10px}.bubu-deck-stepper{gap:8px;font-size:10px}.bubu-deck-stepper button{width:30px;height:30px}.bubu-deck-scroll-hint{font-size:9px}}
@media(prefers-reduced-motion:reduce){.bubu-deck-pick{transition:none}}

/* Project-specific ambience beneath the hero introduction. */
.bubu-hero-sound{display:flex;align-items:center;margin-top:18px}
.bubu-page .bubu-prose>p:last-of-type{margin-bottom:0}
.bubu-page .bubu-sound-toggle{display:inline-flex;align-items:center;justify-content:center;gap:7px;width:auto;min-height:34px;padding:7px 13px;border:1px solid #b9a27655;border-radius:999px;background:#102337d9;color:#ead8b4;font-family:var(--sans);font-size:11px;line-height:1.5;white-space:nowrap;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);transition:background .2s ease,border-color .2s ease}
.bubu-page .bubu-sound-toggle[hidden]{display:none}
.bubu-page .bubu-sound-toggle:hover{background:#263f53ed;border-color:#b9a27699}
.bubu-sound-note{display:inline-block;font-size:13px;transition:transform .2s ease}
.bubu-sound-toggle:hover .bubu-sound-note{transform:rotate(-8deg)}
.bubu-page .bubu-sound-toggle[aria-pressed="true"]{border-color:#c7ac75aa;color:#f7d28c}
.bubu-sound-toggle:focus-visible{outline:2px solid #b59151;outline-offset:4px}
.bubu-sound-status{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
@media(max-width:700px){.bubu-page .bubu-preview-actions{gap:10px 16px}.bubu-page .bubu-sound-toggle{min-height:32px;padding:6px 12px}}
@media(prefers-reduced-motion:reduce){.bubu-page .bubu-sound-toggle,.bubu-sound-note{transition:none}.bubu-sound-toggle:hover .bubu-sound-note{transform:none}}