/* Shared visual language and navigation for the public YourStudyHack site. */
html{scroll-padding-top:100px}
body.ysh-site{--ink:#102c45;--navy:#102c45;--muted:#53616b;--paper:#f7f5ef;--sheet:#fff;--line:#d9dedc;--blue:#163b58;--sans:Arial,Helvetica,sans-serif;--serif:Georgia,'Times New Roman',serif;background:#fff;background-image:none;color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.65;padding-bottom:0}
.ysh-site *{box-sizing:border-box}.ysh-site [hidden]{display:none!important}.ysh-site img{max-width:100%;height:auto}.ysh-site a:focus-visible,.ysh-site button:focus-visible,.ysh-site summary:focus-visible{outline:3px solid #287bb7;outline-offset:4px}
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.ysh-syllabus{background:var(--paper);border-block:1px solid var(--line);padding:42px 0}.ysh-section-heading{display:flex;justify-content:space-between;align-items:end;gap:35px;margin-bottom:30px}.ysh-section-heading h2{margin:0}.ysh-section-heading>p{font-size:15px;max-width:280px;color:var(--muted);margin:0}.ysh-syllabus-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.ysh-syllabus-card{position:relative;background:#fff;border:1px solid #cbd5d6;border-radius:5px;padding:27px 30px;display:grid;grid-template-columns:1fr auto;column-gap:24px;transition:border-color .15s}.ysh-syllabus-card:hover{border-color:#305b73}.ysh-tag{font-size:11px;color:#426b52;grid-column:1/-1}.ysh-site .ysh-syllabus-card h3{font:36px var(--serif);letter-spacing:-.02em;margin:7px 0}.ysh-syllabus-card p{grid-column:1/-1;margin:0;color:var(--muted);font-size:14px}.ysh-syllabus-card>strong{grid-column:2;grid-row:2;align-self:center;font-size:13px;display:flex;gap:14px}
.ysh-site .ysh-section{padding-block:72px}.ysh-learning-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:35px}.ysh-learning-steps article{border-top:1px solid var(--line);padding-top:20px}.ysh-learning-steps article>span{font-size:13px;color:#578273}.ysh-learning-steps h3{font:700 19px/1.4 var(--sans);margin:15px 0 10px}.ysh-learning-steps p{font-size:15px;color:var(--muted);margin:0}.ysh-home .paper-shop{background:#f7f5ef;border-block:1px solid var(--line)}.ysh-site .product-card{background:#fff;box-shadow:none;border-radius:5px;overflow:hidden}.ysh-site .product-card-visual{background:#f0f3f3;height:260px;border-color:var(--line)}.ysh-site .product-card h3{font:24px/1.25 var(--serif);margin-bottom:15px}.ysh-site .product-card-copy{padding:24px}.ysh-site .product-card-copy>p{font-size:14px}.ysh-site .product-card-copy .product-syllabus{font-size:11px;letter-spacing:.06em}.ysh-site .product-card-copy .product-need{font-size:20px;font-family:var(--serif);color:var(--ink)}.ysh-site .product-card-receive{font-size:13px}.ysh-site .product-card-receive>strong{font-size:11px}.ysh-site .product-card-actions .button{font-size:14px}.ysh-site .product-preview-link{font-size:13px;display:block;margin-top:16px;padding:6px 0}.ysh-site .product-price{font:700 25px var(--sans)}.ysh-site .paper-customer-link{font-size:14px}.ysh-igcse-feature{display:grid;grid-template-columns:1.5fr 1fr;align-items:center;gap:80px}.ysh-igcse-feature>div>p{font-size:17px;color:var(--muted);max-width:580px}.ysh-igcse-feature ul{padding-left:20px;font-size:15px;line-height:2;margin-bottom:26px}.ysh-feature-cover{background:var(--paper);border-radius:5px;padding:30px;display:flex;align-items:center;flex-direction:column;gap:20px}.ysh-feature-cover img{width:210px;box-shadow:8px 10px 22px #102c451c}.ysh-feature-cover span{font-size:13px}
.ysh-site .tuition-section{padding-block:64px;background:#eef3f5;border-block:1px solid var(--line)}.ysh-site .tuition-paper{background:transparent;border:0;box-shadow:none}.ysh-site .tuition-copy h2{font-size:40px}.ysh-site .tuition-copy p{font-size:16px}.ysh-site .tuition-portrait{box-shadow:none;transform:none}.ysh-site .tuition-enquiry{font-size:13px;background:#fff;border:1px solid #a9bcb4;color:#245b43}.ysh-site .student-proof{padding:64px 0;background:#fff}.ysh-site .student-review{box-shadow:none;border-color:var(--line);background:#fff}.ysh-site .student-review blockquote{font:17px/1.65 var(--serif)}.ysh-site .student-review footer{font-size:12px}.ysh-help-strip{background:var(--paper);padding:45px 0;border-top:1px solid var(--line)}.ysh-help-strip>.ysh-shell{display:flex;align-items:center;justify-content:space-between;gap:40px}.ysh-help-strip h2{font-size:30px;margin:0 0 12px}.ysh-help-strip p{font-size:15px;color:var(--muted);margin:0}
/* Product and support pages share typography, margins and plain surfaces. */
.ysh-site .spm-book-hero{background:#fff;background-image:none;padding-block:26px 64px}.ysh-site .spm-book-copy h1{font-size:clamp(39px,4.5vw,58px)}.ysh-site .spm-book-copy h1 span{font-size:clamp(29px,3vw,38px);font-style:normal}.ysh-site .spm-book-lead{font-size:17px;line-height:1.7}.ysh-site .spm-book-includes{font-size:15px;line-height:1.8}.ysh-site .spm-cover-display{background:var(--paper);border-radius:6px;padding:30px}.ysh-site .spm-cover-note{font-style:normal;font-size:13px}.ysh-site .spm-cover{transform:none;max-width:280px;margin-inline:auto}.ysh-site .spm-cover img{max-height:350px;object-fit:contain}.ysh-site .spm-add-button{border:1px solid #b5c3cc;background:white;color:var(--ink)}.ysh-site .spm-delivery,.ysh-site .spm-preview-link{font-size:13px}.ysh-site .spm-details{background:#fff}.ysh-breadcrumb{display:flex;gap:12px;color:var(--muted);font-size:13px;padding-top:24px}.ysh-breadcrumb a{text-decoration:underline}.ysh-breadcrumb+.product-hero{padding-top:40px}.ysh-samples{background:var(--paper);border-block:1px solid var(--line)}.ysh-sample-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}.ysh-sample-card{display:block;padding:18px;background:#fff;border:1px solid #d0dadf;border-radius:5px}.ysh-sample-card img{width:100%;height:250px;object-fit:contain;display:block}.ysh-sample-card>span{display:flex;justify-content:space-between;gap:15px;font-size:14px;margin-top:18px}.ysh-sample-card:hover{border-color:#426783}.ysh-sample-video{margin-top:30px;border-block:1px solid #c7d3d9}.ysh-sample-video summary{padding:20px 0;cursor:pointer;font-weight:700;display:flex;justify-content:space-between}.ysh-sample-video>div{max-width:850px;margin:0 auto 26px}.ysh-sample-video video,.ysh-sample-video iframe{width:100%;aspect-ratio:16/9;border:0;border-radius:4px;background:#102c45}.ysh-site .ysh-viewer{width:min(1000px,96vw);height:94dvh;max-width:100vw;max-height:96dvh;border:0;border-radius:5px;padding:0;background:white;color:var(--ink)}.ysh-viewer::backdrop{background:#102c45bb}.ysh-viewer-toolbar{height:64px;display:flex;align-items:center;gap:15px;padding:12px 20px;border-bottom:1px solid var(--line)}.ysh-viewer-toolbar strong{flex:1;font-size:15px}.ysh-viewer-toolbar button{border:1px solid #b9c9d0;background:#edf2f4;border-radius:4px;padding:8px 13px;font-size:13px}.ysh-viewer-scroll{height:calc(100% - 64px);overflow:auto;background:#edf0ed;padding:14px}.ysh-viewer-scroll img{width:100%;max-width:900px;margin:auto;display:block}.ysh-viewer.is-zoomed .ysh-viewer-scroll img{width:1100px;max-width:none}.ysh-site.ysh-viewer-open{overflow:hidden}
.ysh-site :is(.polished-hero,.faq-hero,.legal-hero,.resources-hero,.thank-you-section){background:#fff;background-image:none}.ysh-site :is(.about-story,.about-books,.resource-access-section){background:var(--paper);background-image:none}.ysh-site :is(.polished-portrait,.resource-access-card,.status-card,.thank-you-access,.drive-resource-row){box-shadow:none;border-color:var(--line);border-radius:5px}.ysh-site :is(.faq-list p,.legal-content p,.legal-content li,.polished-hero p){font-size:16px;line-height:1.8}.ysh-site .faq-list summary{font-size:17px}.ysh-site .drive-resource-name p{font-size:14px}.ysh-site .checkout-market-card{box-shadow:none;border-radius:5px;border-color:var(--line)}.ysh-site .checkout-main{background:var(--paper);background-image:none}.ysh-site .checkout-header{background:#fff}.ysh-site .checkout-header .nav-wrap{min-height:82px}.ysh-site .checkout-header-assurance{font-size:13px}.ysh-site .challenge-screen{box-shadow:none;border-color:var(--line);border-radius:6px}.ysh-site .challenge-header{background:#fff}.ysh-site .challenge-column{background:none}
@media(max-width:1050px){.ysh-site .ysh-navigation{gap:18px;font-size:13px}.ysh-home-hero{gap:35px}.ysh-syllabus-card{display:block}.ysh-syllabus-card>strong{margin-top:18px}.ysh-igcse-feature{gap:45px}.ysh-sample-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:800px){html{scroll-padding-top:84px}.ysh-site :is(.wrap,.container,.ysh-shell){width:calc(100% - 40px)}.ysh-header-row{min-height:72px;flex-wrap:wrap;gap:0}.ysh-brand img{width:156px}.ysh-menu{display:flex}.ysh-site .ysh-navigation{display:none;width:100%;align-items:stretch;gap:0;padding:8px 0 18px;flex-direction:column;position:static;background:white;border:0;font-size:16px}.ysh-site .ysh-navigation.is-open{display:flex}.ysh-navigation>a{padding:11px 0}.ysh-site .ysh-cart{margin-top:6px;align-self:flex-start}.ysh-home-hero{grid-template-columns:1fr;padding-block:38px;gap:32px}.ysh-home-hero h1{font-size:clamp(34px,7vw,48px)}.ysh-site .ysh-lead{font-size:17px;max-width:560px}.ysh-intro-figure{max-width:600px;width:100%;margin:auto}.ysh-intro-poster>strong{font-size:clamp(28px,6vw,42px)}.ysh-film-kicker{font-size:10px;margin-bottom:14px}.ysh-poster-steps{margin-top:18px}.ysh-section-heading{display:block;margin-bottom:24px}.ysh-section-heading>p,.ysh-section-heading>.text-link{margin-top:16px;max-width:100%}.ysh-syllabus{padding-block:32px}.ysh-syllabus-grid{gap:16px}.ysh-syllabus-card{padding:23px}.ysh-site .ysh-syllabus-card h3{font-size:32px}.ysh-syllabus-card>strong{font-size:13px}.ysh-syllabus-card p{font-size:14px}.ysh-site .ysh-section{padding-block:46px}.ysh-learning-steps{gap:24px;grid-template-columns:1fr}.ysh-learning-steps article{display:grid;grid-template-columns:32px 1fr;gap:0 12px}.ysh-learning-steps article>span{grid-row:1/3;padding-top:3px}.ysh-learning-steps h3{margin:0 0 8px}.ysh-learning-steps p{grid-column:2}.ysh-igcse-feature{grid-template-columns:1fr;gap:30px}.ysh-feature-cover{max-width:360px;width:100%;margin:auto}.ysh-help-strip>.ysh-shell{display:block}.ysh-help-strip .ysh-actions{margin-top:24px}.ysh-footer-grid{grid-template-columns:1fr 1fr;gap:30px}.ysh-footer-grid>div:first-child{grid-column:1/-1}.ysh-sample-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.ysh-sample-card img{height:220px}.ysh-site .spm-book-grid{gap:35px}.ysh-site .spm-cover-display{max-width:360px;width:100%;margin-inline:auto}.ysh-site .tuition-copy h2{font-size:34px}}
@media(max-width:520px){.ysh-syllabus-grid{grid-template-columns:1fr}.ysh-syllabus-card{display:grid;grid-template-columns:1fr auto;padding:20px}.ysh-syllabus-card>strong{grid-row:2;margin:0;font-size:12px;gap:10px}.ysh-syllabus-card p{font-size:13px}.ysh-site .ysh-home-hero .ysh-actions{gap:12px;align-items:flex-start;flex-direction:column}.ysh-intro-poster{padding:20px!important}.ysh-play-circle{width:44px;height:44px;font-size:16px;margin-top:18px}.ysh-poster-steps{font-size:12px;gap:9px}.ysh-poster-steps>span{padding:7px 10px}.ysh-film-label{font-size:11px}.ysh-site .product-card{display:flex}.ysh-site .product-card-visual{height:230px;border-right:0;border-bottom:1px solid var(--line);min-height:0}.ysh-site .catalog-book-3d{width:130px}.ysh-site .product-card-copy{padding:22px}.ysh-site .product-card-receive{margin-top:12px}.ysh-site .ysh-viewer{width:100vw;height:100dvh;max-height:100dvh;border-radius:0;margin:0}.ysh-viewer-toolbar{padding:10px 12px;gap:8px}.ysh-viewer-toolbar strong{font-size:13px}.ysh-viewer-toolbar button{font-size:12px;padding:8px 10px}.ysh-sample-card{padding:10px}.ysh-sample-card img{height:185px}.ysh-sample-card>span{font-size:12px;margin-top:10px}.ysh-sample-grid{gap:12px}.ysh-site .spm-book-copy h1{font-size:40px}.ysh-site .spm-book-copy h1 span{font-size:30px}.ysh-footer-grid{gap:24px}.ysh-site .ysh-footer nav{font-size:13px}.ysh-site .checkout-header-assurance{font-size:11px;max-width:100px;text-align:right}.ysh-site .checkout-header .brand-logo{width:150px}.ysh-site .paper-customer-link{font-size:13px}.ysh-site .tuition-copy h2{font-size:32px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.ysh-site *{scroll-behavior:auto}.ysh-syllabus-card{transition:none}}
@media(max-width:800px){.ysh-site:not(.ysh-js) .ysh-navigation{display:flex}.ysh-site:not(.ysh-js) .ysh-menu{display:none}}
.ysh-site section{background-image:none}.ysh-site .drive-library-section{background:#fff}.ysh-site.paper-site h1{font-size:clamp(38px,4.5vw,58px);line-height:1.15}.ysh-site .drive-resource-list{box-shadow:none;border-color:var(--line);border-radius:5px;overflow:hidden}.ysh-site .drive-list-heading{background:#eef3f5}.ysh-site .drive-resource-name h2{font-size:28px}.ysh-site .drive-file-icon{box-shadow:none;border-color:#cad8cd;border-radius:4px}.ysh-site :is(.polished-final-cta,.about-books-section){background:var(--paper);background-image:none}.ysh-site .polished-portrait-card{box-shadow:none;border-color:var(--line);border-radius:5px}.ysh-site .about-product-summary ul{font-size:15px;line-height:1.7}.ysh-site .about-product-summary .quiet-link{font-size:14px}
@media(max-width:600px){.ysh-site .drive-resource-name h2{font-size:23px}.ysh-site.paper-site h1{font-size:38px}}
.ysh-intro-app.is-expanded{position:fixed;inset:0;z-index:1000;background:#f7f5ef;display:flex;flex-direction:column;align-items:center;justify-content:center;width:100vw;height:100dvh}.ysh-intro-app.is-expanded .ysh-intro-player{width:min(100vw,calc((100dvh - 100px) * 4 / 3))!important;flex-shrink:0}.ysh-intro-app.is-expanded .ysh-intro-controls{width:min(100%,720px)}
.ysh-intro-screen.is-playing-intro{aspect-ratio:auto}.ysh-site .ysh-intro-player{height:auto}.ysh-intro-controls{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:10px 14px;padding:12px 16px;background:#fff;border-top:1px solid var(--line)}.ysh-site .ysh-intro-controls button{font:13px/1.3 Arial,sans-serif;padding:8px 12px;min-height:36px;border:1px solid #b9c8cd;border-radius:4px;background:#fff;color:#102c45;box-shadow:none}.ysh-intro-time{font:12px Arial,sans-serif;color:#53616b;text-align:center}.ysh-site .ysh-intro-controls input{grid-column:1/-1;display:block;width:100%;height:18px;min-height:18px;padding:0;margin:0;accent-color:#386c5d;cursor:pointer}.ysh-intro-app:fullscreen{background:#f7f5ef;display:flex;flex-direction:column;justify-content:center;align-items:center;width:100%;height:100%}.ysh-intro-app:fullscreen .ysh-intro-player{width:min(100vw,calc((100dvh - 100px) * 4 / 3))!important;flex-shrink:0}.ysh-intro-app:fullscreen .ysh-intro-controls{width:min(100%,720px)}.ysh-intro-notice{font:13px/1.5 Arial,sans-serif;padding:10px 16px;margin:0}