/* Section B Studio V3: scope everything to .sbx to preserve the other Unit 1 screens. */
.sbx{--sbx-ink:#20211e;--sbx-green:#c4f061;--sbx-purple:#72479b;--sbx-paper:var(--reader-card,#fffdf7);--sbx-line:#d6d4cb;color:var(--sbx-ink);max-width:1110px;margin:0 auto;padding:12px 0 72px}
.sbx *, .sbx *::before, .sbx *::after{box-sizing:border-box}
.sbx button,.sbx textarea,.sbx input,.sbx select{font:inherit}
.sbx button{cursor:pointer}
.sbx :is(button,a,input,textarea,select,summary):focus-visible{outline:3px solid #7a479e;outline-offset:4px}
.sbx-overline{display:block;color:#70479c;font-size:11px;font-weight:900;letter-spacing:.15em;text-transform:uppercase}
.sbx-start-head{text-align:center;margin:30px auto 44px;max-width:900px}
.sbx-start-head h1{font-size:clamp(40px,5vw,74px);letter-spacing:-.055em;line-height:1.03;font-weight:900;margin:17px 0 18px}
.sbx h1 em,.sbx-practice-head em{font-family:Georgia,serif;font-weight:500;color:var(--sbx-purple)}
.sbx-start-head p,.sbx-intro p{font-size:18px;color:#64665c;margin:0}
.sbx-strips{display:grid;gap:17px;max-width:1050px;margin:0 auto}
.sbx-strip-wrap{display:block;width:100%;text-align:left;background:none;border:0;padding:0 9px;filter:drop-shadow(4px 6px 0 rgba(42,38,33,.23));transition:transform .18s ease,filter .18s ease}
.sbx-strip-wrap:nth-child(odd){transform:rotate(-.3deg)}.sbx-strip-wrap:nth-child(even){transform:rotate(.28deg)}
.sbx-strip-wrap:hover{transform:translateY(-3px) rotate(0);filter:drop-shadow(5px 9px 0 rgba(42,38,33,.24))}
.sbx-strip-wrap:active{transform:translateY(3px) rotate(0);filter:drop-shadow(1px 2px 0 rgba(42,38,33,.24))}
.sbx-paper-strip{display:grid;grid-template-columns:83px minmax(0,1fr) 110px;align-items:center;gap:17px;min-height:89px;padding:17px 30px 17px 25px;background:repeating-linear-gradient(174deg,#fffdf7 0px,#fffdf7 13px,#f5f1e9 14px,#fffdf7 16px);border-left:1px solid #d1cbbd;border-right:1px solid #d1cbbd;clip-path:polygon(0 0,2% 1%,4% 0,7% 2%,10% 0,15% 1%,21% 0,27% 1%,32% 0,39% 1%,46% 0,53% 2%,59% 0,67% 1%,73% 0,81% 1%,87% 0,95% 1%,100% 0,99.6% 12%,100% 22%,99.6% 38%,100% 49%,99.7% 63%,100% 76%,99.7% 90%,100% 100%,95% 98%,90% 100%,84% 99%,77% 100%,69% 98%,62% 100%,56% 99%,50% 100%,44% 99%,37% 100%,31% 98%,25% 100%,19% 99%,13% 100%,8% 99%,4% 100%,0 99%,.4% 83%,0 70%,.35% 56%,0 41%,.4% 25%,0 10%)}
.sbx-strip-num{font-size:15px;white-space:nowrap;font-weight:800;color:#6d6674;letter-spacing:.08em}.sbx-strip-sep{color:#b8b1b8}
.sbx-paper-strip strong{font-size:clamp(20px,2.3vw,30px);line-height:1.16;font-weight:800;letter-spacing:-.045em}
.sbx-strip-end{border-left:1px dashed #b7b1a5;padding-left:17px;display:flex;align-items:center;justify-content:space-between;gap:7px;color:#62418b;font-size:23px;font-weight:900}
.sbx-strip-cap{font-size:10px;line-height:1.3;letter-spacing:.075em}
.sbx-minor-row{display:flex;justify-content:space-between;gap:16px;align-items:start;margin:29px 8px 0;font-size:13px}.sbx-minor-row a{color:#554472;font-weight:700;text-underline-offset:4px}
.sbx-more{text-align:right;max-width:360px}.sbx-more summary{cursor:pointer;color:#5b5280;font-size:13px;font-weight:750}.sbx-more-actions{margin-top:8px;display:grid;gap:6px;background:var(--sbx-paper);padding:13px;border:1px solid var(--sbx-line);border-radius:10px;text-align:left}
.sbx-more-actions button,.sbx-end-research button{font-size:13px;background:transparent;border:0;color:#674697;text-decoration:underline;text-align:left;font-weight:700;padding:5px}.sbx-more-actions p{font-size:12px;margin:4px 0;color:#666}
.sbx-breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin:6px 0 24px;color:#77766f;font-size:13px}
.sbx-breadcrumb button{font-size:13px;color:#5a4277;font-weight:750;border:0;background:transparent;padding:7px 0}
.sbx-breadcrumb button:not(:last-child):after{content:' / ';color:#aaa;margin-left:10px}
.sbx-intro{max-width:870px;margin:12px 0 29px}.sbx-intro h1{font-size:clamp(34px,4.7vw,66px);letter-spacing:-.05em;line-height:1.08;margin:15px 0}
.sbx-company-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:19px}
.sbx-company{display:flex;align-items:flex-start;flex-direction:column;text-align:left;min-width:0;min-height:336px;padding:21px;border:2px solid #282925;border-radius:20px;background:var(--sbx-paper);box-shadow:6px 7px 0 #292823;transition:transform .16s,box-shadow .16s}
.sbx-company:hover{transform:translateY(-3px);box-shadow:7px 10px 0 #292823}.sbx-company:active{transform:translateY(4px);box-shadow:2px 3px 0 #292823}
.sbx-company-logo{display:flex;align-items:center;justify-content:center;width:100%;height:131px;margin:0 0 18px;border-radius:13px;background:#fff;border:1px solid #e1dfd8}
.sbx-logo{display:block;width:min(92%,270px);height:91px;object-fit:contain}
.sbx-text-mark{font-size:31px;font-weight:850}
.sbx-company-name{font-size:27px;letter-spacing:-.045em;font-weight:900;line-height:1.1}.sbx-company-type{display:block;margin-top:9px;font-size:13px;color:#5c5e56;line-height:1.5}
.sbx-company-go{margin-top:auto;display:flex;justify-content:space-between;align-items:center;width:100%;padding-top:18px;color:#4c336a;font-weight:850;font-size:14px}.sbx-company-go span{font-size:22px}
.sbx-footnote{font-size:12px;color:#77786f;line-height:1.55;margin:19px 0 0}
.sbx-case-heading{background:var(--sbx-paper);border:1px solid var(--sbx-line);padding:24px 30px;border-radius:18px;margin:10px 0 17px}
.sbx-case-kicker{display:flex;align-items:center;justify-content:space-between;gap:10px}.sbx-case-count{color:#61625c;font-size:12px;font-weight:750}
.sbx-case-head-grid{display:flex;align-items:center;justify-content:space-between;gap:20px}.sbx-case-head-grid h1{font-size:clamp(42px,5.5vw,70px);line-height:1.03;letter-spacing:-.06em;margin:14px 0 8px}.sbx-colour-point{color:var(--sbx-purple)}
.sbx-case-head-grid p{margin:0;color:#666;font-size:15px;max-width:480px}.sbx-case-brand{flex:0 1 230px;max-width:240px;background:#fff;border-radius:12px;border:1px solid #eee;padding:5px}.sbx-case-brand .sbx-logo{height:84px;width:100%}
.sbx-topic-name{border-top:1px solid var(--sbx-line);padding-top:16px;margin:20px 0 0;font-size:13px;font-weight:800;color:#654688}
.sbx-stage-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px;margin:0 0 25px}
.sbx-stage-nav button{text-align:left;min-width:0;padding:14px 17px;min-height:82px;border:1px solid #c4c5bd;border-radius:13px;background:var(--sbx-paper);color:#3a3b35}
.sbx-stage-nav button.active{border:2px solid #251f2e;background:#e9dff1;box-shadow:0 3px 0 #251f2e}
.sbx-stage-nav button span{display:block;color:#685085;font-size:11px;font-weight:900;letter-spacing:.09em;margin-bottom:5px}.sbx-stage-nav button strong{font-size:13px;line-height:1.3;display:block}
.sbx-stage-top{display:flex;justify-content:space-between;color:#65615e;font-weight:800;font-size:12px;margin:0 0 8px}
.sbx-reading{background:var(--sbx-paper);border:1px solid var(--sbx-line);border-radius:16px;padding:clamp(20px,3.8vw,39px)}
.sbx-chapter-label{font-size:11px;color:#6f488d;font-weight:900;letter-spacing:.11em}
.sbx-reading h2{font-size:clamp(27px,3vw,40px);letter-spacing:-.04em;line-height:1.15;margin:14px 0 17px}
.sbx-prose{max-width:800px;color:#343631;font-size:17px;line-height:1.84}.sbx-prose p{margin:0}
.sbx-evidence-notice{font-size:13px;line-height:1.6;margin-top:28px;background:#f3f1e7;padding:14px 18px;border-left:4px solid #8665a2;border-radius:7px;color:#343630}
.sbx-practice-head{display:flex;justify-content:space-between;align-items:end;gap:15px;margin:43px 0 20px}.sbx-practice-head h2{font-size:clamp(25px,3vw,39px);letter-spacing:-.045em;margin:7px 0 0}.sbx-practice-head p{max-width:315px;color:#6c6e66;font-size:13px;line-height:1.5;margin:0}
.sbx-practice-list{display:grid;gap:18px}.sbx-question{background:var(--sbx-paper);border:1px solid var(--sbx-line);border-radius:16px;padding:clamp(20px,2.9vw,31px)}
.sbx-question-top{display:flex;justify-content:space-between;gap:12px;align-items:center}.sbx-tariff{background:#e9e1f2;color:#513277;font-size:11px;font-weight:950;letter-spacing:.08em;padding:8px 11px;border-radius:7px}.sbx-response-state{color:#67675f;font-size:12px;font-weight:650}
.sbx-question h3{font-size:clamp(18px,2vw,24px);line-height:1.38;letter-spacing:-.018em;font-weight:800;margin:17px 0 18px}.sbx-mark{color:#5a4075;white-space:nowrap;font-size:.76em}
.sbx-writing-support{display:block;border:1px solid #d3cadb;background:var(--sbx-paper);border-radius:10px;margin:0 0 19px}
.sbx-writing-support summary{font-size:13px;font-weight:800;padding:12px 14px;cursor:pointer;color:#68448a}.sbx-writing-support summary span{font-weight:500;margin-left:6px}
.sbx-hints{padding:0 17px 14px;font-size:14px;line-height:1.6}.sbx-hints p{margin:8px 0}.sbx-light-note{font-size:12px;color:#666a64;line-height:1.5}
.sbx-answer-label{display:block;font-size:13px;font-weight:800;margin:0 0 8px}.sbx-answer{display:block;resize:vertical;width:100%;border:1.5px solid #969a8f;border-radius:10px;line-height:1.65;font-size:15px;color:#20211e;background:var(--sbx-paper);padding:14px;min-height:100px}
.sbx-write-actions{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-top:13px}.sbx-saved{font-size:12px;color:#647064}
.sbx-submit,.sbx-next{background:var(--sbx-green);color:#1d2119;border:2px solid #262821;border-radius:10px;padding:12px 16px;font-size:13px;font-weight:900;box-shadow:4px 5px 0 #262821}
.sbx-submit:hover,.sbx-next:hover{transform:translateY(-1px)}.sbx-submit:active,.sbx-next:active{transform:translateY(3px);box-shadow:1px 2px 0 #262821}
.sbx-validation{font-size:13px;color:#a22429;font-weight:700}.sbx-assess{margin-top:23px;border:1.5px solid #647a54;background:#f0f6e8;border-radius:11px;padding:19px 22px}.sbx-assess[hidden]{display:none!important}.sbx-assess-top strong{display:block;font-size:18px}.sbx-assess-top span{display:block;color:#4f5d49;font-size:12px;margin:3px 0 10px}.sbx-assess ul{margin:10px 0;padding-left:21px;font-size:14px;line-height:1.65}.sbx-assess li{margin:6px 0}.sbx-question-source{border-top:1px solid #ccd6bd;margin:16px 0;padding-top:14px;font-size:13px;line-height:1.6}
.sbx-assess-grid{display:grid;grid-template-columns:185px 1fr;gap:16px}.sbx-assess-grid label{display:grid;gap:7px;font-weight:750;font-size:13px}.sbx-assess-grid :is(select,input){min-width:0;max-width:100%;background:#fff;border:1px solid #a6b19a;border-radius:8px;padding:11px;color:#242c21}
.sbx-stage-bottom{display:flex;gap:15px;justify-content:space-between;flex-wrap:wrap;align-items:center;margin-top:27px}.sbx-secondary,.sbx-small-link{border:1px solid #7b7b70;color:#3c3f38;background:var(--sbx-paper);border-radius:10px;padding:12px 15px;font-size:13px;font-weight:800}
.sbx-end-research{margin-top:29px;border:1px dashed #c0bbc9;padding:22px 24px;border-radius:12px;background:var(--sbx-paper);font-size:14px;line-height:1.7}.sbx-end-research h2{font-size:20px;margin:0 0 8px}.sbx-end-research details{margin:15px 0}.sbx-end-research summary{font-weight:800;cursor:pointer}.sbx-end-research a{display:block;color:#513277;font-weight:700;margin:8px 0;text-underline-offset:3px}
/* Respect reading-colour choices without tinting logo artwork or status feedback. */
html[data-reading-theme]:not([data-reading-theme="default"]) .sbx{--sbx-paper:var(--reader-card)}
html[data-reading-theme]:not([data-reading-theme="default"]) :is(.sbx-reading,.sbx-question,.sbx-company,.sbx-case-heading,.sbx-stage-nav button,.sbx-answer,.sbx-writing-support,.sbx-end-research,.sbx-more-actions){background:var(--reader-card);color:#1e211d}
html[data-reading-theme]:not([data-reading-theme="default"]) :is(.sbx-prose,.sbx-prose p,.sbx-start-head p,.sbx-intro p){color:#242b24}
html[data-reading-theme]:not([data-reading-theme="default"]) .sbx-evidence-notice{background:var(--reader-soft)}
html[data-reading-theme]:not([data-reading-theme="default"]) .sbx-paper-strip{background:repeating-linear-gradient(174deg,var(--reader-card) 0px,var(--reader-card) 13px,var(--reader-subtle) 14px,var(--reader-card) 16px)}
html[data-reading-theme]:not([data-reading-theme="default"]) .sbx-assess{background:#f0f6e8;color:#1e261e}
html[data-reading-theme]:not([data-reading-theme="default"]) .sbx-case-brand,html[data-reading-theme]:not([data-reading-theme="default"]) .sbx-company-logo{background:#fff!important}
@media(max-width:900px){.sbx-company-grid{gap:12px}.sbx-company{min-height:310px;padding:15px}.sbx-paper-strip{grid-template-columns:65px minmax(0,1fr) 88px;gap:13px;padding:14px 20px}.sbx-strip-cap{font-size:9px}}
@media(max-width:700px){.sbx{padding:7px 0 50px}.sbx-start-head{margin:18px auto 31px}.sbx-start-head h1{font-size:clamp(37px,7vw,54px)}.sbx-start-head p,.sbx-intro p{font-size:15px}.sbx-strips{gap:15px}.sbx-paper-strip{min-height:96px;grid-template-columns:39px minmax(0,1fr) 26px;gap:10px;padding:16px 13px}.sbx-strip-num{font-size:11px;writing-mode:horizontal-tb}.sbx-strip-sep,.sbx-strip-cap{display:none}.sbx-strip-end{padding:0 0 0 8px;font-size:23px}.sbx-paper-strip strong{font-size:clamp(17px,3.3vw,24px)}.sbx-company-grid{grid-template-columns:1fr;gap:17px}.sbx-company{min-height:170px;padding:17px;display:grid;grid-template-columns:112px 1fr;gap:4px 17px;align-items:start}.sbx-company-logo{grid-row:1 / span 3;margin:0;height:115px}.sbx-logo{height:82px}.sbx-company-name{font-size:25px}.sbx-company-type{margin-top:3px}.sbx-company-go{padding:9px 0 0;grid-column:2}.sbx-case-brand{max-width:138px}.sbx-case-head-grid h1{font-size:clamp(36px,7vw,51px)}.sbx-case-heading{padding:20px}.sbx-stage-nav{gap:5px}.sbx-stage-nav button{min-height:82px;padding:10px}.sbx-stage-nav button strong{font-size:11px}.sbx-stage-nav button span{font-size:9px}.sbx-practice-head{display:block;margin:30px 0 16px}.sbx-practice-head p{margin-top:10px}.sbx-assess-grid{grid-template-columns:1fr}.sbx-minor-row{align-items:flex-start}}
@media(max-width:390px){.sbx-start-head h1{font-size:35px}.sbx-company{grid-template-columns:96px 1fr;gap:5px 10px}.sbx-company-logo{height:101px}.sbx-company-name{font-size:22px}.sbx-company-type{font-size:12px}.sbx-case-head-grid{display:block}.sbx-case-brand{display:none}.sbx-case-kicker{align-items:start}.sbx-case-count{text-align:right}.sbx-paper-strip{padding:15px 10px}.sbx-paper-strip strong{font-size:17px}.sbx-breadcrumb{gap:8px}.sbx-minor-row{display:block}.sbx-more{margin-top:17px;text-align:left}}
@media(prefers-reduced-motion:reduce){.sbx-strip-wrap,.sbx-company,.sbx-submit,.sbx-next{transition:none!important;transform:none!important;scroll-behavior:auto!important}}
@media print{.sbx-company-grid,.sbx-stage-nav,.sbx-question .sbx-write-actions,.sbx-writing-support,.sbx-stage-bottom,.sbx-minor-row{display:none!important}.sbx-reading,.sbx-question{break-inside:avoid;border-color:#888}.sbx-question textarea{border:1px solid #aaa;min-height:140px}}

.sbx-case-feedback{background:#fffefb;border:1px solid #d6dbcb;border-radius:9px;padding:14px 17px;margin:12px 0;color:#263022}.sbx-case-feedback strong{font-size:13px}.sbx-case-feedback ul{margin:9px 0}.sbx-case-feedback p{font-size:13px;line-height:1.5;margin:10px 0 0}
html[data-reading-theme]:not([data-reading-theme="default"]) .sbx-case-feedback{background:var(--reader-card);color:#20261d}

/* V4 — longer evidence-led case studies, without changing the core question route or storage keys. */
.sbx-reading-meta{display:flex;justify-content:space-between;gap:12px;align-items:center;flex-wrap:wrap}
.sbx-reading-time{font-size:12px;font-weight:700;color:#656860}
.sbx-prose p+p{margin-top:17px}
.sbx-explainer{margin-top:24px;padding-top:22px;border-top:1px solid var(--sbx-line)}
.sbx-explainer h3,.sbx-reading-transfer h3{font-size:19px;letter-spacing:-.02em;margin:0 0 14px;color:#4d3371}
.sbx-reading-transfer{margin-top:25px;padding:20px 23px;border:1px solid #d8cbe2;border-left:4px solid #704999;border-radius:11px;background:#f7f2fb}
.sbx-reading-transfer .sbx-prose{font-size:16px;line-height:1.75}
.sbx-source-details{margin-top:18px;font-size:13px}
.sbx-source-details summary{color:#57416f;font-weight:800;cursor:pointer;max-width:max-content;padding:8px 0}
.sbx-source-details a{display:block;color:#52337a;text-underline-offset:3px;padding:5px 0;overflow-wrap:anywhere}
html[data-reading-theme]:not([data-reading-theme="default"]) .sbx-reading-transfer{background:var(--reader-soft);color:#242b24}
html[data-reading-theme]:not([data-reading-theme="default"]) .sbx-explainer h3,html[data-reading-theme]:not([data-reading-theme="default"]) .sbx-reading-transfer h3{color:#4d3371}
@media(max-width:700px){.sbx-prose{font-size:15.5px;line-height:1.75}.sbx-reading-transfer{padding:16px 17px}.sbx-reading-transfer .sbx-prose{font-size:15px}.sbx-reading-meta{align-items:flex-start}.sbx-reading-time{font-size:11px}}

/* Independently designed neutral case identifiers: no third-party logo artwork. */
.sbx-neutral-mark {display:inline-flex;align-items:center;justify-content:center;min-width:5rem;min-height:4.5rem;padding:.3rem 1rem;border:2px solid #2d2550;border-radius:1.1rem;color:#2d2550;background:#f2f5ee;font-family:inherit;font-weight:900;font-size:clamp(1.35rem,2vw,2rem);letter-spacing:.055em;}