@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{--ink:#183d35;--paper:#f8f7f2;--green:#d9e8b3;--pink:#ecd3d0;--line:#d3d8ce}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:25px}body{margin:0;background:var(--paper);color:var(--ink);font:16px 'DM Sans',sans-serif;line-height:1.6}a{color:inherit;text-decoration:none}button,input{font:inherit}button,a,input,summary{outline-offset:5px}header{padding:25px 6%;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}.brand{font-size:12px;letter-spacing:2px;line-height:1.4}.brand strong{display:block;font-size:19px;letter-spacing:-.5px}.brand span{color:#7b9864;margin-left:10px}nav,.actions{display:flex;align-items:center;gap:32px}nav{font-size:14px}.button{display:inline-flex;justify-content:center;align-items:center;gap:25px;background:var(--ink);color:white;padding:15px 22px;border:0;border-radius:5px;cursor:pointer;font-weight:600}.button:hover{background:#306253}.button.small{padding:10px 18px}.hero{padding:85px 6% 80px;display:grid;grid-template-columns:1.1fr 1fr;gap:7%;align-items:center}h1,h2,h3,h4{font-family:Manrope,sans-serif;line-height:1.12;letter-spacing:-1.5px}h1{font-size:clamp(45px,5.2vw,76px);font-weight:500;margin:20px 0 25px}h1 em{font-style:normal;color:#67824b}h2{font-size:43px;font-weight:500;margin:12px 0}h3{font-size:29px;font-weight:500}.lead{font-size:19px;color:#52675e}.eyebrow{font-size:11px;letter-spacing:2px;font-weight:700}.note{font-size:12px;color:#62736a}.hero .note{margin-top:28px}.actions{margin-top:30px}.textlink{font-size:14px;font-weight:700;text-decoration:underline;text-underline-offset:7px}.example{background:var(--green);padding:28px 35px 36px;position:relative;min-height:395px;border-radius:7px;transform:rotate(1deg)}.example-top{display:flex;justify-content:space-between;font-size:9px;letter-spacing:1px;border-bottom:1px solid #a8be90;padding-bottom:18px}.example>p{font-size:31px;line-height:1.3;letter-spacing:-1px}.equation{font-family:Manrope;font-size:clamp(32px,3.7vw,56px);padding:12px 0 55px;white-space:nowrap}.digit{background:#b5ce8b;position:relative;border-radius:5px}.digit small{position:absolute;top:100%;left:-8px;font-size:10px;white-space:nowrap;padding-top:4px}.arrow{font-size:30px;margin:0 8px}.example-bottom{border-top:1px solid #a8be90;padding-top:20px;display:flex;align-items:center;gap:15px;font-size:12px}.example-bottom span{color:#506346}.circle{border:1px solid var(--ink);border-radius:50%;padding:5px 11px}.sticker{position:absolute;right:-15px;bottom:-25px;background:var(--pink);padding:16px 22px;font-size:12px;transform:rotate(-6deg);box-shadow:0 5px 10px #183d3510}.strip{border-block:1px solid var(--line);padding:20px 6%;display:flex;justify-content:space-between;font-size:10px;letter-spacing:1.5px}section:not(.hero){padding:75px 6%}.section-head{display:flex;justify-content:space-between;align-items:end;margin-bottom:35px;gap:25px}.section-head>p{font-size:14px;color:#62736a}.pathways{display:grid;grid-template-columns:1fr 1fr;gap:22px}.pathways article{padding:32px;background:#e8eddf;border-radius:7px}.pathways article.higher{background:#f0e4e0}.pill{font-size:10px;letter-spacing:1px;border:1px solid #a4b09e;border-radius:20px;padding:7px 12px}.topics{font-size:12px;padding:20px 0;border-top:1px solid #becbbb}.lesson-section{background:#eff1e9}.classroom{border:1px solid #c9d2c3;border-radius:8px;display:grid;grid-template-columns:270px 1fr;overflow:hidden;background:#fffef9}aside{padding:30px;background:#e0e7d8}aside h3{font-size:24px}aside>p{font-size:14px}.lesson-nav{display:grid;gap:16px;border-block:1px solid #becbbb;padding:25px 0;margin:25px 0;font-size:13px}.progress-label{font-size:12px;display:flex;justify-content:space-between}progress{width:100%;height:8px;accent-color:#345c37}.lesson-body{padding:35px 45px;max-width:950px}.lesson-body h3{margin:15px 0 25px}.video-stage{background:var(--ink);color:white;padding:25px;border-radius:6px}.video-stage>span{font-size:9px;letter-spacing:1.3px;color:#cadab7}.video-stage h4{font-size:27px;line-height:1.4;letter-spacing:-.5px}.video-stage>p{min-height:55px;color:#e4ebdd}.framecontrols{display:flex;align-items:center;justify-content:space-between;font-size:12px}.framecontrols button{background:#ffffff15;border:1px solid #a2b6a4;color:white;border-radius:50%;width:38px;height:38px;cursor:pointer}.tip{background:#eef2e6;border-left:3px solid #91ab6f;padding:18px;margin:20px 0;font-size:14px}.tip p{margin:5px 0}.secondary{padding:10px 15px;background:transparent;border:1px solid var(--ink);border-radius:4px;cursor:pointer;color:var(--ink)}.activity{padding-top:35px;border-top:1px solid var(--line);margin-top:35px}label{display:block;font-size:14px;margin:18px 0 8px}input{padding:12px;border:1px solid #9caa99;border-radius:4px;max-width:100%;width:180px;background:white;color:var(--ink)}.inputrow{display:flex;gap:12px}#quizForm>input{display:block}#quizForm>.button{margin-top:24px}details{font-size:14px;margin:20px 0}summary{cursor:pointer;font-weight:700}.feedback{background:#edf1e6;padding:15px;margin-top:15px;font-size:14px;border-radius:4px}.bookgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:25px}.book{aspect-ratio:.72;padding:20px;box-shadow:7px 7px 0 #d4d7cc;border-left:7px solid #183d3520;display:flex;flex-direction:column}.book>span{font-size:8px;letter-spacing:1px}.book h3{font-size:28px;margin-top:40px}.book p{margin-top:0;font-size:13px}.book b{font-size:9px;margin-top:auto;letter-spacing:1px}.green{background:var(--green)}.pink{background:var(--pink)}.light{background:#e9eadf}.pink.light{background:#f0e8e3}.bookgrid article>p{font-size:13px;margin-top:22px}.closing{text-align:center;background:var(--green)}.closing h2{margin-bottom:28px}footer{padding:30px 6%;font-size:12px}footer p{color:#62736a} @media(min-width:1500px){main,header,footer{max-width:1500px;margin:auto}}@media(max-width:850px){.hero{grid-template-columns:1fr;padding-top:45px;gap:40px}.example{max-width:600px}.section-head{align-items:start;flex-direction:column}.classroom{grid-template-columns:1fr}aside .lesson-nav{grid-template-columns:1fr 1fr}.lesson-body{padding:25px}.bookgrid{grid-template-columns:1fr 1fr}.strip{gap:15px;flex-wrap:wrap}nav>a:not(.button){display:none}h2{font-size:34px}.pathways{grid-template-columns:1fr}}@media(max-width:450px){.actions,.inputrow{align-items:start;flex-direction:column}.hero{padding-inline:6%}.example{padding:22px}.bookgrid{gap:18px}.book{padding:12px}.book h3{font-size:22px}header{gap:10px}.brand strong{font-size:15px}.button.small{font-size:12px;padding:10px}.lesson-body{padding:20px}section:not(.hero){padding-block:50px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.video-player video{display:block;width:100%;border-radius:7px;background:#183d35;aspect-ratio:16/9}.video-player label{display:inline-block;margin:0 8px 0 0;font-size:12px}select{padding:7px;border:1px solid #9caa99;background:white;border-radius:4px;color:var(--ink)}.guided-step{padding:15px 20px;background:#eef2e6;margin:20px 0;border-radius:5px}.choices{display:flex;gap:12px}.choices button{width:60px;height:52px;font:600 24px Manrope,sans-serif;background:white;border:1px solid #93a18a;border-radius:7px;cursor:pointer;color:var(--ink)}.choices button.chosen{background:#c8dda5;border:2px solid #547344}.quiz-options{display:flex;justify-content:space-between;align-items:center;gap:15px;font-size:12px}#quizForm .button{display:block}#quizNext,#quizRestart{margin-top:20px}#celebration{color:#365929;font-weight:700;margin-top:15px}.celebrate{animation:reward .55s ease-out}@keyframes reward{0%{transform:scale(.96);opacity:.2}65%{transform:scale(1.025)}100%{transform:scale(1);opacity:1}}[hidden]{display:none!important}@media(prefers-reduced-motion:reduce){.celebrate{animation:none}}
/* Pass GCSE family palette: warm paper, saturated blue/purple and bright topic colours. */
:root{--ink:#2b2630;--paper:#fffbf6;--green:#ffe186;--pink:#ffc9c4;--line:#e5dfeb;--blue:#3f67d8;--purple:#7456d8;--coral:#f56f68}body{font-family:Inter,-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;color:var(--ink)}h1,h2,h3,h4{font-family:inherit;font-weight:800}header{background:#fffdf9;border-bottom:1px solid #eee4e4}.brand{font-size:12px;letter-spacing:.5px;font-weight:800}.brand strong{font-size:22px;letter-spacing:-.8px}.brand span{color:var(--purple)}.button{background:linear-gradient(135deg,var(--blue),var(--purple));border-radius:28px;box-shadow:0 8px 20px #6854cf22}.button:hover{background:linear-gradient(135deg,#3155bc,#6040bb)}.hero{background:radial-gradient(circle at 8% 18%,#ffd16675,transparent 35%),radial-gradient(circle at 91% 16%,#f56f6840,transparent 35%),radial-gradient(circle at 70% 95%,#b2c9ff55,transparent 35%);padding-block:70px 85px}.eyebrow{color:#6c4898;letter-spacing:1.5px}.hero .eyebrow{display:inline-block;background:#ffe9a7;border:1px solid #e5cc72;padding:9px 15px;border-radius:25px}.hero h1{font-size:clamp(43px,5.2vw,74px);font-weight:850;letter-spacing:-3px}.hero h1 em{color:#6750c8}.lead{color:#605864}.textlink{color:#5942b3}.note{color:#6b6072}.example{background:white;transform:none;border:2px solid #e3d9ee;box-shadow:0 18px 45px #69445c15;border-radius:22px;padding:28px;min-height:400px}.example-top{color:#6747b2;border-color:#e8e0f4;font-weight:700}.example>p{font-weight:800;color:#2b2630;font-size:34px}.equation{background:#f1edff;border-radius:14px;text-align:center;padding:20px 5px 45px}.digit{background:#ffd166}.digit small{color:#6a520b}.example-bottom{border:0;padding-top:22px}.circle{background:#daefff;border:0;color:#3159b1!important}.example-bottom span{color:#62556b}.sticker{background:#ffb6a9;color:#6a2d27;border-radius:12px;bottom:-20px;right:-12px;font-weight:700}.strip{background:#6650b8;color:white;border:0;font-weight:700;font-size:11px;padding-block:21px}.pathways article{background:#e5ecff;border:1px solid #c4d2fb;border-top:6px solid #3f67d8;border-radius:18px}.pathways article.higher{background:#f0e6ff;border-color:#ddcaf6;border-top-color:#9560c8}.pill{background:white;border:0;color:#4c3d74;font-weight:700}.topics{border-color:#bfc7e5}.lesson-section{background:linear-gradient(120deg,#edf2ff,#f7efff)}.classroom{border-color:#d9cdec;border-radius:18px;box-shadow:0 12px 32px #48396b0b;background:white}aside{background:#e8e1ff}.lesson-nav{border-color:#cfc1ef}.lesson-nav a{color:#4b3683}.lesson-nav a:hover{color:#244cc0}.progress-label{color:#4b3683}progress{accent-color:#7655d4}.lesson-body h3{font-weight:800}.tip,.guided-step{background:#fff3ce;border-color:#f0bf45;color:#5f4a1c}.feedback{background:#e9f4ff;color:#254d79}.secondary{border:1px solid #b9a4e0;color:#583d95;background:#f7f3ff;border-radius:22px}.choices button{color:#5d3ba4;border-color:#c8b6e9;box-shadow:0 3px 0 #ddd0ef}.choices button.chosen{background:#d7f2d7;border-color:#4a8a50;color:#245b29}.book{border-radius:4px 12px 12px 4px;box-shadow:7px 8px 0 #e3d8ec;border-left-color:#0002}.book.green{background:#3f67d8;color:white}.book.pink{background:#7c4bc3;color:white}.book.green.light{background:#ffcf60;color:#443719}.book.pink.light{background:#ff9488;color:#582e31}.closing{background:radial-gradient(circle at 15% 50%,#ffd16699,transparent 45%),radial-gradient(circle at 90% 20%,#ffb3aa88,transparent 45%),#fff3e5}.closing .eyebrow{color:#8a4b63}footer{background:#2f2544;color:#fff}footer p{color:#ded4e9}.video-player video{border:1px solid #ded3ef;background:#f0eaff}.quiz-options{padding:12px;background:#f5efff;border-radius:12px}#celebration{color:#356635}.course-tools{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;align-items:center;margin:24px 0}.tier-tabs{display:flex;gap:8px;padding:6px;border:1px solid #daceeb;background:white;border-radius:30px}.tier-tabs button{padding:10px 22px;border:0;background:transparent;border-radius:24px;cursor:pointer;color:#61498d;font-weight:700}.tier-tabs button[aria-pressed=true]{background:#7351ca;color:white}.course-search{width:280px;max-width:100%;border-radius:25px}.module-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.module{background:white;border:1px solid #e0d6ea;border-radius:16px;overflow:hidden}.module-band{height:7px;background:var(--module-color)}.module-content{padding:20px}.module h3{font-size:23px;margin:12px 0}.module .eyebrow{color:var(--module-color)}.module ul{list-style:none;padding:0;margin:15px 0}.module li{padding:9px 0;border-bottom:1px solid #eee8f3;font-size:13px;display:flex;justify-content:space-between;gap:10px}.module li a{color:#5037aa;font-weight:700}.module-status{font-size:10px;white-space:nowrap;color:#796d84}.module-count{font-size:12px;color:#6a5e75}.curriculum-note{font-size:13px;color:#64586e;background:#fff3ce;padding:15px;border-radius:10px;margin-top:25px}#curriculum{background:#fffbf6}.skip-link{position:absolute;left:10px;top:-60px;background:white;z-index:10;padding:10px}.skip-link:focus{top:10px}@media(max-width:1000px){.module-grid{grid-template-columns:1fr 1fr}}@media(max-width:600px){.module-grid{grid-template-columns:1fr}.hero h1{letter-spacing:-2px}.example>p{font-size:30px}.course-tools{align-items:stretch}.course-search{width:100%}}@media(prefers-reduced-motion:reduce){.button{transition:none}}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.cover-image{width:100%;display:block;aspect-ratio:.707;object-fit:cover;border-radius:3px 12px 12px 3px;box-shadow:6px 8px 0 #ded1eb}.bookgrid a:hover .cover-image{box-shadow:8px 10px 0 #cbb9e0}.bookgrid a p{font-weight:700;color:#574078}.info-page{max-width:1150px;margin:auto;padding:50px 6%}.info-page h1{font-size:clamp(38px,5vw,62px)}.info-page h2{font-size:32px}.info-grid{display:grid;grid-template-columns:1fr 1fr;gap:25px}.info-card{background:white;border:1px solid #e0d4eb;padding:25px;border-radius:16px}.info-card h3{font-size:25px}.book-detail{display:grid;grid-template-columns:240px 1fr;gap:35px;align-items:start;margin:40px 0;padding:30px;background:white;border:1px solid #e0d4eb;border-radius:16px}.book-detail img{width:100%;border-radius:5px}.book-detail h2{margin-top:0}.info-page details{padding:18px 0;border-bottom:1px solid #e2d9ec}.info-page summary{font-size:18px}.info-page p,.info-page li{max-width:850px}.breadcrumb{font-size:13px;color:#6345b1}.info-banner{background:#fff0c4;padding:20px;border-radius:12px}.footer-nav{display:flex;gap:20px;flex-wrap:wrap;margin:20px 0}.footer-nav a{color:#eee3ff;text-decoration:underline;text-underline-offset:4px}@media(max-width:650px){.book-detail{grid-template-columns:1fr;padding:20px}.book-detail img{max-width:230px}.info-grid{grid-template-columns:1fr}}
.family-wordmark{font-size:20px!important;font-weight:850;letter-spacing:-.8px;color:#161419;line-height:1.2}.family-wordmark:hover{color:#5f43b2}nav{gap:25px}@media(max-width:600px){.family-wordmark{font-size:18px!important;max-width:190px}header nav{gap:5px}}
.topic-icon{display:flex;width:62px;height:62px;align-items:center;justify-content:center;border-radius:17px;margin-bottom:17px}.topic-icon svg{width:48px;height:48px}.module-content>.topic-icon{float:right;margin:0 0 15px 12px}.module-content::after{content:'';display:block;clear:both}

.family-wordmark{display:inline-flex;align-items:center;gap:10px}.family-wordmark .brand-tick{width:34px;height:34px;flex:none}.family-wordmark>span{margin:0;color:inherit;max-width:220px}@media(max-width:600px){.family-wordmark{max-width:230px;gap:8px}.family-wordmark .brand-tick{width:30px;height:30px}.family-wordmark>span{max-width:160px}}
.auth-main{max-width:680px;margin:45px auto;padding:0 20px}.auth-main form{display:grid;gap:18px;margin:24px 0}.auth-main label{display:grid;gap:8px;font-weight:700}.auth-main input:not([type=checkbox]){padding:14px;border:1px solid #746a7c;border-radius:10px;font:inherit;width:100%;box-sizing:border-box}.auth-main .paper-check{display:flex;font-size:14px;align-items:flex-start;font-weight:400}.auth-main .paper-check input{flex:none;margin-top:4px}.auth-main .recovery-code{overflow-wrap:anywhere;display:block;background:#fff2bf;padding:20px;font-size:18px}.progress-sync-note{padding:12px 18px;background:#edf2ff;border-radius:12px}.text-button{background:transparent;border:0;text-decoration:underline;font:inherit;cursor:pointer}.auth-main h1{font-size:clamp(30px,6vw,44px)}button:disabled{opacity:.55;cursor:not-allowed}

.price-period{font-size:18px;font-weight:400}.book-detail form{margin-top:20px}.book-detail form .note{font-size:14px}#pricing .pathways article{border-top:6px solid #3f67d8}#pricing .pathways article+article{border-top-color:#f56f68}
.analytics-consent{position:fixed;z-index:1000;bottom:52px;left:50%;transform:translateX(-50%);width:min(760px,calc(100% - 32px));box-sizing:border-box;background:#fffdf8;border:2px solid #3f67d8;border-radius:18px;padding:22px;box-shadow:0 12px 45px #2b263030;color:#2b2630;font-size:15px}.analytics-consent strong{font-size:20px}.analytics-consent p{margin:10px 0;line-height:1.5}.analytics-consent a{color:#3f51a2;text-decoration:underline}.analytics-actions{display:flex;gap:12px;margin-top:15px;flex-wrap:wrap}.analytics-actions button{border:2px solid #3f67d8;border-radius:10px;padding:12px 18px;background:#3f67d8;color:white;font:inherit;font-weight:700;cursor:pointer;min-height:44px}.analytics-actions button:focus-visible,.analytics-settings:focus-visible{outline:3px solid #f56f68;outline-offset:3px}.analytics-settings{position:fixed;z-index:999;bottom:10px;left:16px;padding:8px 12px;border:1px solid #6f6593;border-radius:8px;background:#fffdf8;color:#3e3455;font-size:13px;cursor:pointer}.analytics-consent[hidden]{display:none}@media(max-width:500px){.analytics-consent{padding:16px;max-height:75vh;overflow:auto}.analytics-actions{gap:8px}.analytics-actions button{flex:1;padding:10px;font-size:14px}}