.sc18-page{--sc18-accent:#2265d8;--sc18-tint:#eff6ff;color:#172638;font-family:inherit;line-height:1.85;max-width:1320px;margin:0 auto;padding:24px!important}.sc18-biology{--sc18-accent:#147b57;--sc18-tint:#eef9f3}.sc18-chemistry{--sc18-accent:#2265d8;--sc18-tint:#eff6ff}.sc18-physics{--sc18-accent:#8053b4;--sc18-tint:#f5f0fa}.sc18-earth{--sc18-accent:#8a5b32;--sc18-tint:#faf3eb}.sc18-page h1{font-size:clamp(28px,4vw,44px);line-height:1.4}.sc18-page h2{font-size:24px;line-height:1.5}.sc18-page h3{font-size:19px;line-height:1.6}.sc18-eyebrow{color:var(--sc18-accent);font-weight:700;font-size:14px}.sc18-lead{font-size:20px}.sc18-muted{font-size:14px;color:#627086}.sc18-grid{display:grid!important;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px!important;margin:24px 0!important}.sc18-grid-four{grid-template-columns:repeat(4,minmax(0,1fr))}.sc18-grid>.sc18-card{margin:0!important}.sc18-card{border:1px solid #dce5ee;border-radius:14px;padding:24px;background:#fff;box-shadow:0 5px 20px #15304b05}.sc18-card h2{margin:16px 0 8px!important}.sc18-card .wp-block-image{margin:0!important}.sc18-card img{width:100%;height:160px;object-fit:contain;background:var(--sc18-tint);border-radius:8px}.sc18-page .wp-block-button__link{font-size:15px;min-height:44px;display:inline-flex;align-items:center;justify-content:center;padding:10px 16px;border-radius:8px}.sc18-page .wp-block-buttons{gap:10px!important;flex-wrap:wrap}.sc18-page .sc18-card .scb-dark .wp-block-button__link{background:var(--sc18-accent)}.sc18-point{padding:16px 20px;border-left:4px solid var(--sc18-accent);background:var(--sc18-tint);border-radius:6px;margin:20px 0}.sc18-point p{margin:0;font-weight:700}.sc18-experiment{padding:14px 18px;background:#f7f9fb;border:1px dashed #b5c3d3;border-radius:8px;margin:18px 0}.sc18-experiment h3{font-size:16px!important;margin:0!important}.sc18-experiment p{margin:4px 0 0!important}.sc18-experiment .wp-block-video:empty{display:none}.sc18-image-row{gap:24px;align-items:center}.sc18-image-row img{width:100%;max-height:250px;object-fit:contain}.sc18-page .sc4-hero img{max-height:240px;object-fit:contain}.sc18-page .sc4-video-thumb img{height:140px;object-fit:contain}.sc18-page .sc4-home-preview{padding:16px!important}.sc18-page .sc4-home-lessons .wp-block-button__link{min-height:48px}.sc18-page .sc4-application-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.sc18-page .sc4-application{padding:16px!important}.sc18-page .sc4-application h3{margin:0!important}.sc18-page .sc4-panel{margin-top:16px}.sc18-related{margin-top:32px}.sc18-page .sc4-topic-menu .wp-block-button__link{white-space:normal;min-height:48px}.sc18-page .sc4-lesson-body>div{margin-bottom:18px}.sc18-page details{margin:16px 0;padding:12px 0;border-top:1px solid #dce5ee}.sc18-page summary{cursor:pointer;font-weight:700;min-height:32px}.sc18-page a:focus-visible,.sc18-page summary:focus-visible{outline:3px solid #e7a734;outline-offset:3px}
@media(max-width:780px){.sc18-page{padding:16px!important}.sc18-grid,.sc18-grid-four{grid-template-columns:1fr;gap:14px!important}.sc18-grid-four{grid-template-columns:repeat(2,minmax(0,1fr))}.sc18-card{padding:18px}.sc18-page h2{font-size:21px}.sc18-page .sc4-hero{gap:12px!important}.sc18-page .sc4-hero img{max-height:170px}.sc18-page .sc4-home-lessons .wp-block-button__link{min-height:50px!important;padding:12px!important}.sc18-page .sc4-home-preview{font-size:14px}.sc18-page .sc4-home-preview h3{font-size:17px}.sc18-page .sc4-application-grid{grid-template-columns:1fr}.sc18-page .sc4-lesson-columns{display:block!important}.sc18-page .sc4-lesson-columns>.wp-block-column{width:100%!important}.sc18-page .sc4-topic-menu{position:static;margin-bottom:18px}.sc18-image-row{display:block!important}.sc18-image-row img{max-height:190px}.sc18-page .sc4-steps{gap:8px}.sc18-page .sc4-steps .wp-block-button__link{font-size:13px}.sc18-page .sc15-choices{grid-template-columns:1fr}.sc18-page .sc15-choices button{min-height:48px}}

/* Subject accents cover the lesson itself, not only its category card. */
.sc18-page.sc4-page .sc4-en,.sc18-page .sc4-step.is-active .wp-block-button__link,.sc18-page .sc4-step.is-active .wp-block-button__link strong,.sc18-page .sc4-step.is-active .wp-block-button__link span{color:var(--sc18-accent)!important}
.sc18-page.sc4-page .sc4-topic.is-active .wp-block-button__link{background:var(--sc18-tint)!important;color:var(--sc18-accent)!important;border-left-color:var(--sc18-accent)!important}
.sc18-page .sc4-topic.is-active .wp-block-button__link:before,.sc18-page .sc4-step.is-active .wp-block-button__link:before,.sc18-page.sc4-unit .sc4-step-discover .wp-block-button__link:before,.sc18-page .sc4-label:before,.sc18-page .sc4-label h2:after,.sc18-page .sc4-hero h1:after,.sc18-page .sc4-lesson-body h2:before{background:var(--sc18-accent)!important}
.sc18-page .sc4-hero,.sc18-page .sc4-highlight{background:var(--sc18-tint)!important}
.sc18-page.sc4-page .wp-block-button__link{color:var(--sc18-accent);border-color:var(--sc18-accent)}
.sc18-page.sc4-page .scb-dark .wp-block-button__link,.sc18-page .sc18-card .scb-dark .wp-block-button__link{background:var(--sc18-accent)!important;color:#fff!important;border-color:var(--sc18-accent)!important}
.sc18-page .sc15-levels [aria-current=page]{background:var(--sc18-tint)!important;color:var(--sc18-accent)!important;border-color:var(--sc18-accent)!important}
.sc18-page .sc15-choices [aria-pressed=true]{outline-color:var(--sc18-accent)!important;background:var(--sc18-tint)!important}
.sc18-page .sc15-knowledge a:hover,.sc18-page .sc4-home-lessons a:hover{background:var(--sc18-tint)!important}
.sc18-page .sc4-discovery-copy .wp-block-button__link{border-color:var(--sc18-accent)!important;color:var(--sc18-accent)!important}
.sc18-grade-section{scroll-margin-top:90px;margin-top:32px}.sc18-grade-nav{margin:24px 0}.sc18-grade-nav .wp-block-button__link{background:var(--sc18-tint);color:var(--sc18-accent);border:1px solid var(--sc18-accent)}

/* Text-first navigation, aligned with the mathematics unit layout. */
.sc18-page.sc4-page .sc4-home-lessons .wp-block-buttons{display:flex!important;flex-direction:column!important;gap:0!important;align-items:stretch!important}
.sc18-page.sc4-page .sc4-home-lessons .wp-block-button{width:100%!important;margin:0!important}
.sc18-page.sc4-page .sc4-home-lessons .wp-block-button__link{position:relative;display:flex!important;justify-content:flex-start!important;text-align:left!important;width:100%!important;box-sizing:border-box;min-height:48px!important;padding:10px 38px 10px 16px!important;line-height:1.5!important;color:#172638!important;white-space:normal!important;border-radius:0!important}
.sc18-page.sc4-page .sc4-home-lessons .wp-block-button__link:before{flex:none!important;margin-right:12px!important;color:var(--sc18-accent)!important;background:var(--sc18-tint)!important}
.sc18-page.sc4-page .sc4-home-lessons .wp-block-button__link:after{content:'›';position:absolute;right:16px;color:var(--sc18-accent);font-size:20px}
.sc18-page.sc4-page .sc4-topic:not(.is-active) a{color:#34465a!important}
.sc18-page.sc4-page .sc4-hero{background:linear-gradient(110deg,#fff 20%,var(--sc18-tint));padding:24px!important;border-radius:12px;overflow:visible}
.sc18-page.sc4-page .sc4-hero .wp-block-image{margin:0!important;align-self:center}
.sc18-page.sc4-page .sc4-hero img{object-fit:contain!important;width:100%!important;height:auto!important;max-height:240px;display:block}
.sc18-page.sc4-page .sc4-hero-actions a{border-color:var(--sc18-accent)!important;color:var(--sc18-accent)!important}
.sc18-page.sc4-page .sc4-hero-actions .scb-dark a{color:white!important}
.sc18-page.sc4-unit .sc4-overview-row{align-items:center!important}
.sc18-page.sc4-unit .sc4-label{align-self:start}
.sc18-page .sc19-discovery-visual{border-radius:10px;background:var(--sc18-tint);padding:18px 22px;min-height:130px;display:flex;flex-direction:column;justify-content:center}
.sc18-page .sc19-question-mark{font-size:24px;color:var(--sc18-accent);font-weight:800;margin:0!important}
.sc18-page .sc19-question{font-size:19px;line-height:1.65;font-weight:700;margin:6px 0 0!important}
.sc18-page .sc4-discovery-copy p{font-size:15px;line-height:1.8;margin:0 0 12px!important}
.sc18-page .sc19-kicker{font-size:12px;font-weight:700;color:var(--sc18-accent);margin:0 0 8px!important}
.sc18-page.sc4-page .sc19-preview{display:block!important;min-height:0!important}
.sc18-page .sc19-preview .sc18-point{font-size:16px;padding:12px;margin:12px 0!important}
.sc18-page.sc4-page .sc4-difficulty .wp-block-button__link{color:#172638!important;border:0!important;justify-content:flex-start!important;background:transparent!important}
.sc18-page.sc4-page .sc4-difficulty p{margin:2px 0 0!important;line-height:1.55;color:#627086;font-size:13px}
.sc18-page.sc4-page .sc4-application{padding:8px 14px!important;min-height:54px;display:flex;align-items:center}
.sc18-page.sc4-page .sc4-application .wp-block-buttons,.sc18-page.sc4-page .sc4-application .wp-block-button{width:100%}
.sc18-page.sc4-page .sc4-application a{justify-content:space-between!important;border:0!important;background:transparent!important;color:#172638!important;padding:6px!important;width:100%;box-sizing:border-box}
.sc18-page .sc19-reference{margin:16px 0;overflow-x:auto}.sc18-page .sc19-reference table{border-collapse:collapse;width:100%;font-size:15px}.sc18-page .sc19-reference td{border:1px solid #dce5ee;padding:12px;vertical-align:top;line-height:1.8}.sc18-page .sc19-reference td:first-child{width:29%;font-weight:700;background:var(--sc18-tint)}
.sc18-page .sc19-concepts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:20px 0}.sc18-page .sc19-concept{background:var(--sc18-tint);border-radius:8px;padding:16px}.sc18-page .sc19-concept p{font-size:14px;margin:6px 0}.sc18-page .sc19-concept-title{font-weight:700;color:var(--sc18-accent)}
.sc18-page .sc19-question-layout{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(270px,1fr);gap:20px;align-items:start;margin:20px 0 32px}.sc18-page .sc19-question-layout .sc4-panel{margin:0!important}.sc18-page .sc19-question-panel>p{font-size:18px;line-height:1.9;min-height:110px;margin:20px 0 32px}.sc18-page .sc19-question-support .sc15-support{margin-top:0!important}.sc18-page .sc19-question-support .sc15-choices{grid-template-columns:1fr}.sc18-page .sc19-question-support button{min-height:46px}.sc18-page .sc4-lesson-body>.sc4-panel{padding:24px}.sc18-page .sc4-lesson-body p{line-height:1.95}.sc18-page .sc4-lesson-body details{margin:14px 0 0}.sc18-page .sc19-intuition>details{font-size:14px}.sc18-page .sc18-experiment{margin:10px 0 0}.sc18-page summary{display:list-item;line-height:1.6;padding:4px 0}.sc18-page .sc18-grade-nav a{min-width:88px}.sc18-page .sc18-grid .sc18-card .wp-block-buttons{gap:8px!important}
@media(max-width:900px){.sc18-page .sc19-question-layout{grid-template-columns:1fr}.sc18-page .sc19-question-support .sc15-choices{grid-template-columns:repeat(3,minmax(0,1fr))}.sc18-page .sc19-concepts{grid-template-columns:1fr}}
@media(max-width:600px){.sc18-page.sc4-page .sc4-hero{padding:18px!important}.sc18-page .sc4-lesson-body>.sc4-panel{padding:18px}.sc18-page .sc19-question-support .sc15-choices{grid-template-columns:1fr}.sc18-page .sc19-question-panel>p{font-size:17px;min-height:60px}.sc18-page .sc19-reference table{font-size:14px}.sc18-page .sc19-reference td{padding:9px}.sc18-page.sc4-page .sc4-home-lessons .wp-block-button__link{min-height:52px!important;font-size:15px!important}.sc18-page.sc4-page .sc4-home-preview h3{font-size:18px!important}.sc18-page .sc4-hero img{max-height:150px!important}.sc18-page .sc19-preview .sc18-point{font-size:15px}.sc18-page .sc19-discovery-visual{min-height:90px}}
.sc18-page.sc4-page .sc4-home-lessons .wp-block-button__link{font-size:15px!important;min-height:52px!important}
.sc18-page.sc4-page .sc4-topic a{font-size:15px!important;line-height:1.6!important;min-height:48px!important;justify-content:flex-start!important;text-align:left!important}
.sc18-page.sc4-page .sc4-steps .sc4-en{color:var(--sc18-accent)!important}
@media(min-width:781px) and (max-width:1050px){.sc18-page.sc4-unit .sc4-overview-row:not(.sc4-two-part){display:grid!important;grid-template-columns:minmax(140px,.65fr) minmax(0,2fr);gap:18px!important}.sc18-page.sc4-unit .sc4-overview-row:not(.sc4-two-part)>.wp-block-column:first-child{grid-row:1 / span 2}.sc18-page.sc4-unit .sc4-overview-row:not(.sc4-two-part)>.wp-block-column:nth-child(3){grid-column:2}.sc18-page.sc4-unit .sc4-overview-row>.wp-block-column{width:auto!important}}