.section-colour-0,.section-colour-1,.section-colour-2,.section-colour-3,.section-colour-4{--section:#334155;--section-soft:#f1f3f4;}
.challenge-sections{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:20px;list-style:none;margin:32px 0 0;padding:0;}
.challenge-sections li{min-width:0;border-top:1px solid #d6dade;background:var(--section-soft);padding:24px 20px 28px;}
.challenge-sections img{margin-bottom:24px;}.challenge-sections li>span{display:block;color:var(--section);font-size:12px;font-weight:800;margin-bottom:8px;}
.challenge-sections h3{margin:0;color:var(--deep);font:800 22px/1.25 system-ui,sans-serif;letter-spacing:0;overflow-wrap:break-word;}
.organiser-flow{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px;margin-top:32px;}
.organiser-flow>div{border-top:1px solid #d6dade;padding:24px 0;}
.organiser-flow img{float:right;}.organiser-flow span{color:var(--green);font-weight:800;font-size:13px;}.organiser-flow h3{font:800 25px/1.2 system-ui,sans-serif;color:var(--deep);}.organiser-flow p{color:var(--muted);}
.experience-pair{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:30px;margin-top:36px;align-items:start;}.experience-pair>div{min-width:0;}
.experience-step{font-size:20px;color:var(--deep);margin:0 0 20px;}
.challenge-demo{max-width:860px;margin:30px auto 0;border:1px solid #d6dade;border-radius:4px;background:#fff;overflow:hidden;color:var(--ink);}
.experience-pair .challenge-demo,.experience-pair .results-demo{margin-top:0;}
.demo-top{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;background:#f5f6f7;border-bottom:1px solid #d6dade;padding:17px 24px;}
.demo-label{margin:0;color:#3a5668;font:800 11px/1.5 system-ui,sans-serif;letter-spacing:0;}.demo-timer{display:flex;align-items:center;gap:8px;font-size:12px;color:#435e70;}
.demo-progress{display:flex;align-items:center;gap:20px;padding:20px 24px 14px;font-size:13px;font-weight:750;}.demo-progress>span{white-space:nowrap;}.demo-progress progress{width:100%;height:7px;accent-color:#334155;border:0;border-radius:3px;overflow:hidden;background:#e4ede8;}.demo-progress progress::-webkit-progress-bar{background:#e4ede8;}.demo-progress progress::-webkit-progress-value{background:#334155;}
.demo-section-track{display:grid;grid-template-columns:repeat(5,1fr);gap:7px;padding:0 24px;}.demo-section-track>span{position:relative;display:grid;place-items:center;height:36px;background:var(--section-soft);color:var(--section);font-size:14px;font-weight:650;border-bottom:3px solid transparent;}.demo-section-track>span[aria-current]{border-color:var(--section);}.demo-section-track>span>span{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);}
.demo-question-area{padding:28px 24px 22px;min-height:340px;}.demo-question-area .eyebrow{font-size:12px;margin:0 0 10px;color:#52606d;}.demo-question-area h3{margin:0 0 24px;font:650 25px/1.35 system-ui,sans-serif;color:var(--deep);letter-spacing:0;}
.demo-question-area fieldset{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:0;border:0;padding:0;}.demo-question-area label{position:relative;display:flex;align-items:center;gap:10px;min-height:58px;border:1px solid #d6dade;border-radius:4px;padding:12px;cursor:pointer;font-size:14px;line-height:1.4;color:var(--ink);}.demo-question-area input{width:16px;height:16px;flex-shrink:0;accent-color:#075fc9;margin:0;}.demo-question-area label>span{font-size:12px;color:var(--muted);font-weight:800;}.demo-question-area label:has(input:checked){background:#eaf3fd;border-color:#075fc9;}.demo-question-area label:has(input:focus-visible){outline:3px solid #ffbf47;outline-offset:2px;}
.demo-controls{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;border-top:1px solid #d7e1e8;padding:18px 24px;}.demo-controls span{flex-basis:100%;order:3;color:var(--muted);font-size:12px;min-height:20px;}.demo-controls button,.demo-restart{min-height:44px;padding:10px 14px;border:1px solid #075fc9;border-radius:4px;background:#075fc9;color:#fff;font:750 14px/1.4 system-ui,sans-serif;cursor:pointer;}.demo-controls button:first-child{background:#fff;color:#075fc9;}.demo-controls button:disabled{background:#f1f4f5;border-color:#bdcbd3;color:#526b7d;cursor:default;}.demo-disclaimer{margin:0;padding:16px 24px;border-top:1px solid #d7e1e8;color:#526b7d;font-size:12px;line-height:1.5;}.challenge-demo noscript{display:block;padding:0 24px;font-size:14px;}
.demo-complete{padding:36px 24px;text-align:left;min-height:340px;}.completion-mark{display:grid;place-items:center;width:64px;height:64px;margin:0 0 22px;border-radius:4px;background:#eaf4e9;color:#334155;font-size:35px;}.demo-complete h3{font:650 28px/1.2 system-ui,sans-serif;color:var(--deep);}.demo-complete p{font-size:15px;color:var(--muted);}
.results-demo{max-width:860px;margin:30px auto 0;padding:30px;border:1px solid #d6dade;border-radius:4px;background:#fff;color:var(--ink);}
.result-heading{display:flex;justify-content:space-between;align-items:center;gap:20px;border-bottom:1px solid #d6dade;padding-bottom:28px;}.result-heading h3{margin:12px 0;font:800 28px/1.2 system-ui,sans-serif;color:var(--deep);letter-spacing:0;}.result-heading p:not(.demo-label){font-size:14px;color:var(--muted);margin:0;}.result-overall{display:grid;min-width:110px;text-align:center;}.result-overall>strong{font:800 64px/1 system-ui,sans-serif;color:#334155;}.result-overall strong span{font-size:24px;}.result-overall>span{font-size:12px;color:var(--muted);margin-top:8px;}
.result-section-bars{display:grid;gap:22px;margin:28px 0;}.result-section-bars>div>div{display:flex;justify-content:space-between;gap:20px;font-size:14px;margin-bottom:7px;}.result-section-bars strong{color:var(--section);}.result-section-bars meter{display:block;appearance:none;width:100%;height:8px;border:0;border-radius:3px;background:var(--section-soft);overflow:hidden;}.result-section-bars meter::-webkit-meter-bar{height:13px;border:0;border-radius:3px;background:var(--section-soft);}.result-section-bars meter::-webkit-meter-optimum-value{background:var(--section);}.result-section-bars meter::-moz-meter-bar{background:var(--section);}
.results-demo figcaption{display:flex;align-items:flex-start;gap:14px;padding-top:24px;border-top:1px solid #d6dade;font-size:13px;line-height:1.6;color:var(--muted);}.results-demo figcaption img{flex-shrink:0;}.results-demo figcaption strong{color:var(--deep);}
.regional-eligibility-list{display:grid;gap:12px;font-size:15px;}.regional-eligibility-list>span{display:block;}
.catalogue-notice{border-left:3px solid #334155;padding:4px 0 4px 22px;margin:30px 0;color:var(--muted);max-width:850px;}.catalogue-notice strong{color:var(--deep);}.catalogue-notice p{margin:8px 0;font-size:15px;}.catalogue-notice a{color:var(--blue);}
.catalogue-filters{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:36px;}.catalogue-filters label{display:grid;gap:7px;font-size:14px;font-weight:750;}.catalogue-filters select{width:100%;min-height:46px;border:1px solid #a3b9ad;border-radius:4px;padding:8px 12px;background:#fff;color:var(--deep);font:inherit;}.catalogue-count{font-size:14px;color:var(--muted);min-height:24px;margin:20px 0;}
.paper-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:26px;}.paper-card{min-width:0;border:1px solid #c7d5cc;border-radius:4px;background:#fff;overflow:hidden;display:flex;flex-direction:column;}.paper-cover{min-height:240px;display:flex;flex-direction:column;align-items:flex-start;gap:16px;background:var(--section-soft);border-left:9px solid var(--section);padding:26px 24px;}.paper-cover>span{font-size:12px;color:var(--section);font-weight:800;}.paper-cover strong{font:800 25px/1.2 system-ui,sans-serif;letter-spacing:0;color:var(--deep);}.paper-cover img{margin-bottom:3px;}.paper-details{padding:22px;display:flex;flex-direction:column;flex:1;}.paper-details h3{margin:0;font-size:19px;line-height:1.3;}.paper-details>p{font-size:14px;color:var(--muted);}.paper-details .paper-price{font-size:17px;font-weight:800;color:var(--deep);margin:10px 0;}.paper-details .paper-availability{font-size:12px;margin:0 0 20px;}.paper-details button{margin-top:auto;min-height:44px;border:1px solid #bccac1;border-radius:4px;background:#f2f5f3;color:#526b7d;padding:10px;font:750 13px/1.4 system-ui,sans-serif;}
@media(max-width:1050px){.challenge-sections{gap:12px;}.challenge-sections li{padding:20px 14px;}.challenge-sections h3{font-size:19px;}.experience-pair{grid-template-columns:1fr;}.paper-grid{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media(max-width:700px){.challenge-sections{grid-template-columns:repeat(2,minmax(0,1fr));}.challenge-sections li:last-child{grid-column:1/-1;}.organiser-flow{grid-template-columns:1fr;gap:0;}.catalogue-filters{grid-template-columns:1fr;gap:14px;}.paper-grid{grid-template-columns:1fr;}.paper-cover{min-height:220px;}.result-heading{align-items:flex-start;}.result-overall{min-width:90px;}.result-overall>strong{font-size:54px;}.results-demo{padding:24px;}.demo-top,.demo-controls{padding:16px 20px;}.demo-progress{padding:20px 20px 14px;}.demo-section-track{padding-inline:20px;}.demo-question-area{padding:24px 20px;}.demo-question-area h3{font-size:25px;}.demo-question-area fieldset{grid-template-columns:1fr;}.demo-question-area label{min-height:54px;}.result-heading h3{font-size:25px;}}
@media(max-width:400px){.result-heading{flex-wrap:wrap;}.result-overall{text-align:left;}.demo-controls button{width:100%;}.demo-controls span{order:0;}.demo-controls button:first-child{order:2;}.results-demo{padding:20px;}.challenge-sections h3{font-size:18px;}}
@media(prefers-reduced-motion:no-preference){.demo-question-area label{transition:background .15s,border-color .15s;}.challenge-sections li{transition:background .15s;}}
.demo-introduction{margin:0;padding:22px 24px 0;font-size:14px;line-height:1.65;color:#435e70;}
.demo-context,.demo-difficulty{font-size:13px;line-height:1.5;margin:0 0 10px;color:#435e70;}
.demo-difficulty{font-weight:750;margin-bottom:22px;}
.demo-question-area label>.demo-answer-text{font-size:14px;font-weight:500;color:var(--ink);min-width:0;overflow-wrap:break-word;}
.demo-feedback{min-height:48px;font-size:15px;line-height:1.5;margin:20px 0 0;font-weight:700;}
.demo-feedback[data-outcome="correct"]{color:#216344;}.demo-feedback[data-outcome="incorrect"]{color:#9d332e;}
.demo-question-area label:has(input:disabled){cursor:default;}
.school-results-demo{max-width:1040px;margin:36px auto 0;background:#fff;border:1px solid #d6dade;border-radius:4px;overflow:hidden;color:var(--ink);}
.school-results-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:24px 30px;border-bottom:1px solid #c6d7df;background:#f5f6f7;}
.school-results-heading h3{font:800 28px/1.2 system-ui,sans-serif;color:var(--deep);margin:10px 0 6px;letter-spacing:0;}.school-results-heading p:not(.demo-label){font-size:15px;color:#435e70;margin:0;}
.results-release{font-size:13px;line-height:1.5;font-weight:750;color:#216344;border-left:3px solid #334155;padding-left:10px;}
.school-results-body{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);}
.school-results-list{padding:24px 26px;min-width:0;}.school-results-list table{width:100%;min-width:0;border-collapse:collapse;table-layout:fixed;font-size:14px;}
.school-results-list caption{text-align:left;font-size:16px;font-weight:750;color:var(--deep);padding-bottom:18px;}
.school-results-list th,.school-results-list td{padding:16px 8px;text-align:left;border-bottom:1px solid #d5e0e6;overflow-wrap:break-word;}
.school-results-list thead th{background:#f5f6f7;color:#435e70;font-size:12px;}.school-results-list th:first-child{width:46%;}.school-results-list th:nth-child(2){width:24%;}.school-results-list th:nth-child(3){width:30%;}
.school-results-list tbody th{font-weight:650;color:var(--deep);}.school-results-list td strong{font-size:18px;color:#172b3a;}.school-results-list td:last-child{font-size:12px;color:#216344;}
.school-results-list .result-highlight{background:#f5f6f7;}.result-selected-label{display:block;font-size:12px;font-weight:500;color:#435e70;margin-top:5px;}
.school-result-detail{padding:28px 30px;border-left:1px solid #d5e0e6;min-width:0;}.school-result-score{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:10px;}.school-result-score h4{margin:0;font-size:21px;color:var(--deep);}.school-result-score>strong{font:800 42px/1 system-ui,sans-serif;color:#172b3a;}.school-result-score>strong>span{font-size:21px;}
.school-result-detail-note{font-size:13px;color:#435e70;margin:18px 0 0;}.school-result-detail .result-section-bars{margin:20px 0 0;gap:16px;}
.school-results-demo figcaption{padding:18px 30px;border-top:1px solid #d5e0e6;font-size:13px;line-height:1.6;color:#435e70;}
@media(max-width:700px){.demo-introduction{padding:20px 20px 0;}.school-results-body{grid-template-columns:1fr;}.school-result-detail{border-left:0;border-top:1px solid #d5e0e6;}.school-results-heading{padding:22px 20px;align-items:flex-start;flex-wrap:wrap;}.school-results-list{padding:22px 12px;}.school-result-detail{padding:24px 20px;}.school-results-demo figcaption{padding:18px 20px;}.school-results-heading h3{font-size:25px;}}

/* Public sample controls: quiet until a choice needs attention. */
.demo-section-track>span[aria-current]{color:#075fc9;border-color:#075fc9;background:#edf4fc;}
.demo-question-area label{padding:14px;gap:12px;}
.demo-question-area label:has(input:enabled):hover{border-color:#697786;background:#f5f6f7;}
.demo-question-area label:has(input:checked){border-color:#075fc9;background:#edf4fc;}
.demo-question-area label:has(input:focus-visible){outline:2px solid #075fc9;outline-offset:3px;}
.demo-controls button:not(:disabled):hover,.demo-restart:hover{filter:brightness(.92);}
.demo-controls button:not(:disabled):active,.demo-restart:active{transform:translateY(1px);}
.demo-controls button:focus-visible,.demo-restart:focus-visible{outline:2px solid #075fc9;outline-offset:3px;}
.demo-feedback:empty{min-height:0;margin-top:0;}
.demo-feedback:not(:empty){padding:14px 0;border-top:1px solid #d6dade;}
.demo-controls button:disabled{opacity:1;}
.challenge-demo [hidden]{display:none!important;}
@media(forced-colors:active){.demo-question-area label:has(input:checked){outline:2px solid Highlight;}.result-section-bars meter{forced-color-adjust:auto;}}
/* Subject-specific colour belongs to the content, with dark readable labels. */
.challenge-sections .section-colour-0{--section:#146a81;--section-soft:#e3f4f8}
.challenge-sections .section-colour-1{--section:#286b45;--section-soft:#e8f5eb}
.challenge-sections .section-colour-2{--section:#92591e;--section-soft:#fff1db}
.challenge-sections .section-colour-3{--section:#71519c;--section-soft:#f1eafa}
.challenge-sections .section-colour-4{--section:#a34151;--section-soft:#fce9ee}
.challenge-sections li{border-top:3px solid var(--section);border-radius:5px;background:var(--section-soft);transition:none}
.challenge-sections li>span{color:var(--section)}
.challenge-sections h3{color:#142f43}

/* Public samples echo the supervised Challenge and private student record. */
.challenge-demo,.results-demo{border:1px solid #cddbe6;border-radius:10px;box-shadow:0 6px 20px #092b4508}
.demo-top{background:#092b45;color:white;padding:16px 24px}.demo-brand{display:flex;align-items:center;gap:14px;font-size:15px;font-weight:700}.demo-brand img{background:white;border-radius:4px;padding:4px;object-fit:contain}.demo-brand small{display:block;color:#c2d5e5;font-size:11px;font-weight:400;margin-top:3px}.demo-top .demo-timer{color:#d7e8f3}.demo-top .demo-timer img{display:none}
.demo-section-track{grid-template-columns:repeat(5,minmax(0,1fr));gap:5px}.demo-section-track>span{height:auto;min-height:76px;display:flex;flex-direction:column;align-items:flex-start;justify-content:flex-start;padding:10px 8px;border:1px solid #d6e1ea;border-bottom:3px solid #d6e1ea;background:#f6f8fb;color:#526578;border-radius:4px;font-size:14px;gap:5px}.demo-section-track>span>span{position:static;width:auto;height:auto;overflow:visible;clip-path:none;font-size:10px;line-height:1.35;font-weight:500}.demo-section-track>span[aria-current]{background:#e9f2ff;border-color:#075fc9;color:#075fc9}
.demo-question-area{margin:20px 18px;background:#fff;border:1px solid #d4dfe8;border-left:4px solid #075fc9;border-radius:7px;padding:22px}.demo-question-area .eyebrow{color:#075fc9;font-weight:700}.demo-question-area h3{font-size:23px}.demo-question-area input[type=radio]{position:absolute;opacity:0;width:1px;height:1px}.demo-question-area label>span:first-of-type{display:grid;place-items:center;width:28px;height:28px;flex:0 0 28px;border:1px solid #b7cadb;border-radius:4px;background:white;color:#526578}.demo-question-area label:has(input:checked)>span:first-of-type{background:#075fc9;border-color:#075fc9;color:white}.demo-question-area label .demo-answer-text{font-weight:400;font-size:14px;color:#142f43}.demo-question-area label:has(input:checked){box-shadow:inset 3px 0 #075fc9}.demo-progress progress{accent-color:#075fc9}.demo-progress progress::-webkit-progress-value{background:#075fc9}.demo-progress progress::-moz-progress-bar{background:#075fc9}
.results-demo{padding:0;overflow:hidden}.result-portal-bar{background:#092b45;color:white;padding:20px 26px;font-size:14px;font-weight:700}.result-portal-bar span{display:block;color:#c2d5e5;font-weight:400;font-size:11px;margin-top:3px}.result-heading{padding:28px;background:#eef5fc}.result-heading h3{font-size:26px}.result-overall>strong{color:#075fc9;font-size:56px}.result-section-bars{margin:28px}.result-section-letter{display:inline-grid;place-items:center;width:26px;height:26px;margin-right:10px;border-radius:4px;background:#e8f1fc;color:#075fc9;font-size:12px}.result-section-bars>div>div{align-items:center}.result-section-bars>div{--section:#075fc9;--section-soft:#e9eff5}.results-demo figcaption{margin:0 28px;padding:22px 0}.result-section-bars meter{height:9px}.demo-complete{border-top:4px solid #075fc9;background:#eef5fc}
@media(max-width:500px){.demo-section-track{grid-template-columns:repeat(2,minmax(0,1fr))}.demo-section-track>span{min-height:58px}.demo-section-track>span:last-child{grid-column:1/-1}.demo-question-area{margin:16px 12px;padding:18px}.result-heading{padding:22px}.result-section-bars{margin:22px}.result-section-bars>div>div{font-size:12px}}