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(color:color-mix(in lab, red, red)){.subject-header{background:linear-gradient(90deg, color-mix(in srgb, var(--subject-soft,var(--surface-muted)) 72%, var(--surface)), var(--surface-muted))}}.subject-header{box-shadow:var(--shadow-soft);padding:16px}.paged-study .subject-header{border-left:8px solid var(--subject-accent)}.subject-header p:last-child{color:var(--text-muted);margin-top:6px;line-height:1.65}.summary-button{flex:none}.lesson-sections{gap:18px;margin-top:16px;display:grid}.lesson-section{border:1px solid var(--border);background:var(--surface-muted);border-radius:8px}@supports (color:color-mix(in lab, red, red)){.lesson-section{background:color-mix(in srgb, var(--surface-muted) 58%, var(--surface))}}.lesson-section{padding:12px}.lesson-section.learn{border-left:6px solid var(--accent)}.lesson-section.practice{border-left:6px solid var(--blue)}.lesson-section-header{justify-content:space-between;align-items:flex-start;gap:12px;padding:2px 2px 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