/* Subject previews: lightweight original vectors and native disclosure controls. */
.curriculum-main .subject-hero{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(260px,.8fr);gap:40px;max-width:none;align-items:center}
.subject-hero-copy{min-width:0}
.subject-hero-copy>p{font-size:18px;font-weight:500;line-height:1.75;color:#485a50;max-width:650px}
.subject-hero h1{font-size:clamp(36px,4.5vw,57px)}
.subject-hero h1>span{font-size:clamp(24px,2.6vw,31px);line-height:1.35}
.subject-scene{margin:48px 0 0;min-width:0;padding:16px 10px 24px;text-align:center;background:radial-gradient(ellipse at 50% 50%,#edf2e2 0%,rgba(237,242,226,.4) 48%,transparent 73%)}
.subject-visual{display:block;width:100%;max-width:360px;height:auto;max-height:310px;margin:auto}
.subject-scene figcaption{font-size:14px;line-height:1.6;font-weight:500;color:#5d7050;max-width:240px;margin:8px auto 0}
.subject-sample{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:clamp(28px,5vw,64px);align-items:start;border-top:1px solid var(--line);padding:48px 0}
.sample-intro{padding-top:14px;min-width:0}
.sample-intro h2{font-size:clamp(27px,3vw,37px);line-height:1.2;letter-spacing:-1px;margin:16px 0}
.sample-intro>p{font-size:16px;line-height:1.8;color:#485a50;max-width:450px}
.sample-method{list-style:none;padding:0;margin:22px 0 0;display:grid;gap:10px;font-size:15px;font-weight:550;color:#35543f}
.sample-method li{position:relative;padding-left:20px;line-height:1.65}
.sample-method li:before{content:"";position:absolute;left:0;top:.65em;background:#88a16b;width:6px;height:6px;border-radius:50%}
.subject-booklet{min-width:0;background:#fffef9;border:1px solid #d5dfca;border-radius:5px 18px 18px 5px;box-shadow:4px 5px 0 #e9efdf,0 12px 28px rgba(48,75,43,.04);padding:25px 28px 20px;border-left:6px solid #adc396}
.subject-booklet-header{display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid #e0e6d6;padding-bottom:14px;margin-bottom:22px}
.subject-booklet-header>span:first-child{font-size:24px;font-weight:700;color:#234c40;letter-spacing:-1.5px;line-height:1}
.subject-booklet-header>span:last-child{font-size:9px;font-weight:650;letter-spacing:1.4px;color:#667b55;text-align:right;line-height:1.5}
.booklet-topic{font-size:10px;font-weight:700;letter-spacing:1.25px;line-height:1.6;color:#62764f}
.sample-equation{font-family:Manrope,sans-serif;font-size:clamp(24px,3.1vw,32px);line-height:1.45;letter-spacing:-.8px;font-weight:600;margin:15px 0;color:#234c40;overflow-wrap:anywhere}
.sample-equation sub{font-size:.55em}
.booklet-question{font-size:16px;line-height:1.8;color:#344d3e;margin:0 0 18px}
.force-preview{display:block;width:100%;height:auto;max-height:118px;margin:8px 0 14px}
.worked-example{border-top:1px solid #dce5d1;margin-top:18px}
.worked-example summary{display:flex;align-items:center;justify-content:space-between;gap:16px;list-style:none;cursor:pointer;min-height:54px;padding:14px 0;font-size:15px;font-weight:700;color:#234c40;line-height:1.5}
.worked-example summary::-webkit-details-marker{display:none}
.worked-example summary>span{display:grid;place-items:center;flex-shrink:0;width:26px;height:26px;background:#edf2e5;border-radius:50%;font-size:21px;line-height:1;font-weight:400;transition:transform .2s ease}
.worked-example[open] summary>span{transform:rotate(45deg)}
.worked-example ol{counter-reset:worked;list-style:none;margin:6px 0 20px;padding:0;display:grid;gap:20px}
.worked-example li{display:flex;align-items:flex-start;gap:12px;min-width:0;counter-increment:worked}
.worked-example li:before{content:counter(worked);flex-shrink:0;display:grid;place-items:center;width:23px;height:23px;background:#e7eeda;color:#4b6939;border-radius:50%;font-size:11px;font-weight:700;margin-top:2px}
.worked-example li>div{min-width:0}
.worked-example h4{font-size:15px;line-height:1.5;font-weight:700;color:#2d4b37;margin:0 0 5px;letter-spacing:0}
.worked-example li p{font-size:14px;line-height:1.75;color:#485b49;margin:0 0 9px}
.worked-line{font-family:Manrope,sans-serif;font-size:16px;font-weight:600;line-height:1.65;padding:10px 12px;background:#f0f4e8;border-radius:7px;overflow-wrap:anywhere;color:#315739}
.booklet-takeaway{font-size:14px;line-height:1.7;border-left:2px solid #91aa73;padding:0 0 0 13px;margin:0 0 19px;color:#425e37;font-weight:550}
.sample-origin{font-size:11px;line-height:1.65;color:#67745d;border-top:1px solid #e4e9db;padding-top:13px;margin:3px 0 0}
.past-paper-connection{margin-top:26px;padding-top:22px;border-top:1px solid var(--line);max-width:450px}
.sample-label{font-size:10px;letter-spacing:1.2px;font-weight:750;color:#637c4e}
.past-paper-connection p{font-size:14px;line-height:1.75;color:#485a50;margin:10px 0 13px}
.past-paper-connection a{display:block;font-size:14px;font-weight:700;line-height:1.6;color:#234c40;text-decoration:underline;text-underline-offset:4px;padding:6px 0}
.past-paper-format{display:block;font-size:12px;font-weight:500;margin-top:6px;color:#546d44}
.past-paper-connection small{display:block;margin-top:13px;font-size:11px;line-height:1.65;color:#697660}
.hub-subject-art{width:90px;height:73px;margin:-9px 0 12px -8px;flex-shrink:0}
@media(hover:hover) and (prefers-reduced-motion:no-preference){.subject-visual{transition:transform .3s ease}.subject-scene:hover .subject-visual{transform:translateY(-3px)}}
@keyframes subject-lift{from{transform:translateY(8px)}to{transform:translateY(0)}}
@keyframes subject-draw{from{stroke-dashoffset:500}to{stroke-dashoffset:0}}
@keyframes solution-appear{from{opacity:.35;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}
@media(prefers-reduced-motion:no-preference){.scene-arrived .scene-float{animation:subject-lift .9s cubic-bezier(.2,.7,.3,1) both}.scene-arrived .scene-trace{stroke-dasharray:500;animation:subject-draw 1.15s ease-out both}.worked-example[open] ol{animation:solution-appear .25s ease-out}}
@media(max-width:950px){.curriculum-main .subject-hero{grid-template-columns:minmax(0,1.4fr) minmax(210px,.7fr);gap:22px}.subject-hero h1{font-size:42px}.subject-hero .curriculum-actions{align-items:flex-start;flex-direction:column;gap:16px}.subject-sample{gap:30px}.subject-booklet{padding:23px 22px 18px}}
@media(max-width:700px){.curriculum-main .subject-hero{grid-template-columns:1fr;gap:6px}.subject-hero h1{font-size:clamp(32px,8.4vw,38px)}.subject-hero-copy>p{font-size:17px;line-height:1.75}.subject-hero .curriculum-actions{flex-direction:row;flex-wrap:wrap;align-items:center}.subject-scene{margin:6px 0 0;padding:0 10px 12px}.subject-visual{max-height:180px;max-width:230px}.subject-scene figcaption{font-size:13px;max-width:none;margin:0 auto}.subject-sample{grid-template-columns:1fr;gap:24px;padding:30px 0 36px}.sample-intro{padding-top:0}.sample-intro h2{font-size:28px;max-width:460px}.sample-method{gap:6px;margin-top:17px;font-size:15px}.past-paper-connection{margin-top:21px;padding-top:17px;max-width:none}.subject-booklet{padding:21px 20px 18px;box-shadow:3px 4px 0 #e9efdf;max-width:560px;width:100%;justify-self:center}.booklet-question{font-size:16px}.worked-example summary{font-size:15px;min-height:56px}.worked-example li p{font-size:15px}.sample-origin{font-size:11px}.hub-subject-art{width:78px;height:64px;margin-bottom:9px}}
@media(prefers-reduced-motion:reduce){.subject-visual,.worked-example summary>span{transition:none}.scene-float,.scene-trace,.worked-example[open] ol{animation:none!important}.scene-trace{stroke-dasharray:none;stroke-dashoffset:0}}

/* Subject-specific softly shaded icons; restrained depth, no extra downloads. */
.topic-art{display:block;width:48px;height:48px;margin:0 0 18px;flex-shrink:0;transition:transform .25s ease}
.unit-card .topic-art{margin-bottom:16px}
@media(hover:hover) and (prefers-reduced-motion:no-preference){.unit-card:hover .topic-art,.topic-grid article:hover .topic-art{transform:translateY(-2px)}}
@media(max-width:650px){.topic-grid article{grid-template-columns:38px minmax(0,1fr);column-gap:14px}.topic-grid .topic-art{grid-column:1;grid-row:1/3;width:38px;height:38px;margin:0}.unit-card .topic-art{width:44px;height:44px;margin-bottom:14px}}
@media(prefers-reduced-motion:reduce){.topic-art{transition:none}}

/* Booklet disclosures supply their own single plus/minus, separate from FAQ styling. */
.worked-example>summary::after,.worked-example[open]>summary::after{content:none;display:none}
.worked-example>summary::marker{content:""}
.worked-example summary>.example-toggle{margin-left:auto;transform:none}
.worked-example[open] summary>.example-toggle{transform:none}
.example-toggle svg{display:block}
.example-toggle .toggle-vertical{transition:opacity .18s ease}
.worked-example[open] .example-toggle .toggle-vertical{opacity:0}
@media(prefers-reduced-motion:reduce){.example-toggle .toggle-vertical{transition:none}}

/* Compact physical booklet preview: one readable page, all working visible. */
.subject-sample{align-items:center;grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr)}
.subject-book-stage{position:relative;isolation:isolate;width:100%;max-width:500px;justify-self:center;min-width:0;padding:10px 8px 18px 22px;perspective:1400px}
.subject-book-stage:before{content:"";position:absolute;z-index:-1;inset:7px 1px 4px 7px;background:linear-gradient(110deg,#658454 0%,#8da577 12%,#c7d6b5 14%,#b2c79a 100%);border:1px solid #7f9c69;border-radius:7px 14px 14px 7px;transform:rotate(-1.3deg);box-shadow:0 12px 20px rgba(41,66,35,.08)}
.subject-book-stage:after{content:"";position:absolute;z-index:-1;left:20px;right:10px;bottom:10px;height:12px;background:repeating-linear-gradient(to bottom,#f8f9f1 0,#f8f9f1 2px,#d9dfcf 2px,#d9dfcf 3px);border-radius:0 0 8px 3px;transform:rotate(-.8deg)}
.subject-booklet.subject-booklet-open{position:relative;width:100%;max-width:none;padding:21px 23px 17px 29px;background:linear-gradient(90deg,#e8eddf 0,#f9faf3 12px,#fffef9 34px,#fffef9 96%,#f6f7ee 100%);border:1px solid #d8dfcc;border-left:1px solid #c5d0b6;border-radius:3px 12px 12px 3px;box-shadow:3px 3px 0 #e5e9db;transform:rotateY(-3deg) rotateZ(.6deg);transform-origin:left center}
.subject-booklet-open:before{content:"";position:absolute;top:0;bottom:0;left:11px;width:1px;background:#cbd5bf;opacity:.65;pointer-events:none}
.subject-booklet-open .subject-booklet-header{padding-bottom:11px;margin-bottom:17px;gap:12px}
.subject-booklet-open .resource-brand-logo{width:35px;height:35px}
.subject-booklet-open .subject-booklet-header>span:last-child{font-size:8px;letter-spacing:1.1px}
.subject-booklet-open .booklet-topic{font-size:9px;letter-spacing:1px}
.subject-booklet-open .sample-equation{font-size:27px;margin:12px 0;line-height:1.4}
.subject-booklet-open .booklet-question{font-size:15px;line-height:1.7;margin:0 0 14px}
.subject-booklet-open .force-preview{max-height:80px;margin:4px 0 9px}
.subject-booklet-open .booklet-working{margin-top:15px;padding-top:14px}
.booklet-working>h3{font-family:Manrope,sans-serif;font-size:14px;line-height:1.5;letter-spacing:0;font-weight:700;color:#31543d;margin:0 0 13px}
.booklet-working ol{gap:13px;margin:0 0 14px}
.booklet-working li{gap:9px}
.booklet-working li:before{width:20px;height:20px;font-size:10px;margin-top:0}
.booklet-working h4{font-size:13px;line-height:1.5;margin:0 0 4px}
.booklet-working .worked-line{font-size:14px;line-height:1.7;padding:2px 0 6px;background:none;border-radius:0;border-bottom:1px solid #e6ebdd}
.booklet-working li:last-child .worked-line{background:#edf3e4;border:0;border-radius:5px;padding:7px 10px;font-weight:700}
.subject-booklet-open .booklet-takeaway{font-size:12px;line-height:1.65;padding-left:10px;margin:0 0 12px}
.subject-booklet-open .sample-origin{font-size:10px;padding-top:10px;line-height:1.6}
@media(max-width:950px) and (min-width:701px){.subject-sample{grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:24px}.subject-booklet.subject-booklet-open{padding-right:18px;padding-left:25px}}
@media(max-width:700px){.subject-sample{grid-template-columns:1fr;gap:20px}.subject-book-stage{max-width:460px;padding:7px 5px 15px 15px;perspective:none}.subject-booklet.subject-booklet-open{transform:none;padding:20px 19px 16px 24px;border-radius:3px 10px 10px 3px}.subject-booklet-open:before{left:9px}.subject-booklet-open .sample-equation{font-size:25px}.subject-booklet-open .booklet-question{font-size:15px}.booklet-working h4{font-size:14px}.booklet-working .worked-line{font-size:15px}.booklet-working ol{gap:14px}.subject-booklet-open .booklet-takeaway{font-size:13px}.subject-book-stage:before{inset:5px 1px 4px 4px;transform:rotate(-.7deg)}.subject-book-stage:after{left:14px;right:7px;bottom:8px;transform:none}}