.learn-wrap{width:100%;max-width:760px;margin:0 auto;padding:0 24px 80px}.learn-breadcrumb{margin-bottom:1.25rem;padding-top:1.75rem}.learn-breadcrumb a{color:#9ca3af;font-size:.85rem;font-weight:500;text-decoration:none;transition:color .15s}.learn-breadcrumb a:hover{color:#7c3aed}.learn-tag{letter-spacing:.12em;text-transform:uppercase;color:#a78bfa;margin-bottom:.4rem;font-size:.7rem;font-weight:600}.learn-title{color:#111827;margin-bottom:.75rem;font-size:clamp(2rem,5vw,2.8rem);font-weight:900;line-height:1.1}.learn-subtitle{color:#6b7280;max-width:560px;margin-bottom:2.5rem;font-size:1rem;line-height:1.75}.learn-section{margin-bottom:3.5rem}.story-section{color:#374151;font-size:1rem;line-height:1.8}.story-section p{margin-bottom:1rem}.story-section a{color:#7c3aed;font-weight:600}.story-section strong{color:#111827}.story-callout{color:#4b5563;background:#faf5ff;border-left:3px solid #a855f7;border-radius:0 10px 10px 0;align-items:flex-start;gap:.75rem;margin:1.25rem 0;padding:1rem 1.25rem;font-size:.925rem;line-height:1.65;display:flex}.callout-emoji{flex-shrink:0;margin-top:1px;font-size:1.25rem}.station-header{align-items:flex-start;gap:1rem;margin-bottom:1.25rem;display:flex}.station-number{color:#fff;background:#7c3aed;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:36px;height:36px;margin-top:2px;font-size:.875rem;font-weight:800;display:flex}.station-title{color:#111827;margin-bottom:.2rem;font-size:1.3rem;font-weight:800}.station-desc{color:#9ca3af;font-size:.875rem}.sieve-msg{color:#374151;opacity:0;background:#f9fafb;border:1px solid #e5e7eb;border-radius:8px;min-height:2.5rem;margin-bottom:1.25rem;padding:.75rem 1rem;font-size:.9rem;line-height:1.55;transition:opacity .3s}.sieve-msg-visible{opacity:1}.sieve-grid{grid-template-columns:repeat(10,1fr);gap:6px;margin-bottom:1.25rem;display:grid}.sieve-cell{aspect-ratio:1;color:#374151;-webkit-user-select:none;user-select:none;background:#fff;border:1.5px solid #e5e7eb;border-radius:8px;justify-content:center;align-items:center;font-size:.8rem;font-weight:600;transition:all .25s;display:flex}.cell-crossed{color:#d1d5db;background:#f9fafb;border-color:#f3f4f6;font-weight:400;text-decoration:line-through}.cell-prime-now{color:#6d28d9;background:#ede9fe;border-color:#7c3aed;font-weight:800;transform:scale(1.1);box-shadow:0 0 0 3px #7c3aed26}.cell-prime-confirmed{color:#7c3aed;background:linear-gradient(135deg,#ede9fe,#fdf4ff);border-color:#a855f7;font-weight:800;box-shadow:0 2px 8px #a855f733}.sieve-controls{flex-wrap:wrap;gap:.75rem;margin-bottom:1rem;display:flex}.sieve-result{color:#166534;background:#f0fdf4;border:1.5px solid #bbf7d0;border-radius:10px;padding:1rem 1.25rem;font-size:.9rem;line-height:1.65}.btn-primary{color:#fff;cursor:pointer;background:#7c3aed;border:none;border-radius:8px;padding:.6rem 1.25rem;font-size:.875rem;font-weight:700;transition:background .15s,transform .1s}.btn-primary:hover{background:#6d28d9}.btn-primary:active{transform:scale(.97)}.btn-ghost{color:#6b7280;cursor:pointer;background:0 0;border:1.5px solid #e5e7eb;border-radius:8px;padding:.6rem 1.25rem;font-size:.875rem;font-weight:600;transition:border-color .15s,color .15s}.btn-ghost:hover{color:#7c3aed;border-color:#7c3aed}.quiz-progress{gap:6px;margin-bottom:1.25rem;display:flex}.quiz-dot{background:#e5e7eb;border-radius:50%;width:10px;height:10px;transition:background .2s}.dot-done{background:#7c3aed}.dot-current{background:#a855f7;transform:scale(1.2)}.quiz-card{text-align:center;background:#fff;border:1.5px solid #e5e7eb;border-radius:14px;padding:2rem}.quiz-number{color:#7c3aed;letter-spacing:-2px;margin-bottom:.5rem;font-size:4rem;font-weight:900;line-height:1}.quiz-question{color:#374151;margin-bottom:1.5rem;font-size:1.05rem;font-weight:600}.quiz-buttons{justify-content:center;gap:.75rem;display:flex}.btn-yes{color:#166534;cursor:pointer;background:#dcfce7;border:2px solid #86efac;border-radius:10px;padding:.75rem 2rem;font-size:.95rem;font-weight:700;transition:all .15s}.btn-yes:hover{background:#bbf7d0;border-color:#4ade80;transform:translateY(-1px)}.btn-no{color:#991b1b;cursor:pointer;background:#fee2e2;border:2px solid #fca5a5;border-radius:10px;padding:.75rem 2rem;font-size:.95rem;font-weight:700;transition:all .15s}.btn-no:hover{background:#fecaca;border-color:#f87171;transform:translateY(-1px)}.quiz-feedback{text-align:left;border-radius:10px;padding:1.25rem}.feedback-correct{background:#f0fdf4;border:1.5px solid #bbf7d0}.feedback-wrong{background:#fff7ed;border:1.5px solid #fed7aa}.feedback-badge{color:#111827;margin-bottom:.5rem;font-size:1rem;font-weight:800}.feedback-hint{color:#4b5563;font-size:.9rem;line-height:1.6}.quiz-done{text-align:center;padding:2.5rem 1rem}.quiz-score-big{color:#7c3aed;margin-bottom:.75rem;font-size:4rem;font-weight:900;line-height:1}.quiz-verdict{color:#6b7280;margin-bottom:1.5rem;font-size:1rem}.try-row{flex-wrap:wrap;gap:.75rem;margin-bottom:1rem;display:flex}.try-input{color:#111827;border:1.5px solid #e5e7eb;border-radius:8px;outline:none;flex:1;min-width:120px;max-width:200px;padding:.6rem 1rem;font-size:1rem;font-weight:600;transition:border-color .15s}.try-input:focus{border-color:#7c3aed}.try-result{border-radius:10px;align-items:flex-start;gap:.75rem;padding:1rem 1.25rem;font-size:.95rem;line-height:1.5;display:flex}.try-prime{color:#5b21b6;background:#faf5ff;border:1.5px solid #d8b4fe}.try-composite{color:#78350f;background:#fffbeb;border:1.5px solid #fde68a}.try-emoji{flex-shrink:0;font-size:1.25rem}.try-error{color:#dc2626;font-size:.875rem}.learn-footer-nav{border-top:1px solid #e5e7eb;margin-top:1rem;padding-top:2rem}.learn-next{color:#7c3aed;font-size:.95rem;font-weight:700;text-decoration:none;transition:color .15s}.learn-next:hover{color:#6d28d9}@media (max-width:480px){.sieve-grid{grid-template-columns:repeat(7,1fr);gap:4px}.sieve-cell{font-size:.7rem}.quiz-number{font-size:3rem}.quiz-buttons{flex-direction:column}.btn-yes,.btn-no{width:100%}}