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1.25rem;font-size:.95rem;font-weight:700;text-decoration:none;transition:background .15s,transform .15s;display:inline-flex}.primary-action-btn:hover,.primary-action-btn:focus-visible{outline-offset:2px;background:#d1d9ff;outline:2px solid #94b8ff}.primary-action-btn span[aria-hidden=true]{transition:transform .2s;display:inline-block}.lesson-links-details{color:#92a4c9;font-size:.85rem}.lesson-links-details summary{cursor:pointer;user-select:none;text-underline-offset:3px;padding:.3rem 0;text-decoration:underline}.lesson-links-details summary:hover,.lesson-links-details summary:focus-visible{color:#d1ddf7}.lesson-links-details summary:focus-visible{outline-offset:4px;border-radius:3px;outline:2px solid #a7b8ff}.direct-lesson-links{flex-direction:column;gap:.4rem;max-height:220px;margin:.75rem 0 0;padding-left:0;list-style:none;display:flex;overflow-y:auto}.direct-lesson-links li a{color:#bac9e8;border-radius:.3rem;padding:.2rem .4rem;text-decoration:none;display:block}.direct-lesson-links li a:hover,.direct-lesson-links li a:focus-visible{color:#fff;background:#25334d;outline:none}.direct-lesson-links li a:focus-visible{outline-offset:-2px;outline:2px solid #a7b8ff}.lesson-idx{color:#8597b8;margin-right:.25rem;font-family:ui-monospace,monospace;font-size:.8rem}.footer a{color:#a7b8ff}.footer{color:#8c9cb8;text-align:center;border-top:1px solid #1f2738;margin-top:5rem;padding-top:2rem;font-size:.85rem}@media (width<=850px){.hero-layout{grid-template-columns:minmax(0,1fr)}.hero-art{max-width:620px;transform:none}.header{padding-bottom:3rem}}@media (width<=600px){.page{width:min(100% - 2rem,1200px)}.header{overflow-x:clip}h1{font-size:clamp(2.2rem,10.5vw,2.9rem)}.hero-actions{flex-direction:column;align-items:stretch}.hero-facts{justify-content:space-between}.section-heading{flex-direction:column;align-items:start;gap:.2rem}.part-grid{grid-template-columns:minmax(0,1fr)}.card-header{align-items:flex-start;gap:.5rem}.status-badge{text-align:right}.art-code{overflow:auto}}@media (prefers-reduced-motion:reduce){.part-card{transition:none}.hero-art{transform:none}}