.study-guide-container{max-width:1200px;margin:0 auto;padding:2rem 1rem}.study-guide-header{text-align:center;padding:2.5rem 1.5rem;border-radius:var(--radius-lg);background:linear-gradient(145deg,#fff,#eef2ff);box-shadow:var(--shadow-soft);border:1px solid rgba(148,163,184,.2);margin-bottom:2.5rem}.study-guide-header h1{font-size:clamp(1.6rem,3vw,2.2rem);font-weight:800;color:var(--text-main);margin:0 0 .6rem}.study-guide-subtitle{font-size:1rem;color:var(--text-muted);max-width:700px;margin:0 auto 1rem;line-height:1.6}.category-badge{display:inline-block;padding:.35rem 1.2rem;background:var(--bg-soft);border:1px solid var(--border-light);border-radius:999px;font-size:.85rem;font-weight:600;color:var(--text-muted)}.category-badge span{color:var(--text-main);font-weight:700}.category-selector{display:flex;flex-wrap:wrap;gap:.7rem;justify-content:center;margin:1.2rem 0}.category-option{display:flex;align-items:center;gap:.5rem;padding:.6rem 1.2rem;background:var(--bg-card);color:var(--text-muted);text-decoration:none;border-radius:10px;font-weight:600;font-size:.85rem;border:1px solid var(--border-light);transition:border-color var(--transition-fast),color var(--transition-fast)}.category-option:hover{border-color:var(--primary-color);color:var(--primary-color)}.category-option.active{background:var(--gradient-primary);color:#fff;border-color:transparent}.category-option svg{width:18px;height:18px;flex-shrink:0}.study-section{background:var(--bg-card);border:1px solid var(--border-light);border-radius:var(--radius-lg);padding:1.6rem 1.4rem;margin-bottom:1.5rem;box-shadow:var(--shadow-soft)}.study-section h2{font-size:1.3rem;font-weight:700;color:var(--text-main);margin:0 0 1.2rem;padding-bottom:.6rem;border-bottom:2px solid var(--border-light)}.revision-topics{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1rem}.revision-topic{background:var(--bg-card);border:1px solid var(--border-light);border-radius:var(--radius-lg);padding:1.2rem;box-shadow:var(--shadow-soft);border-left:4px solid var(--primary-color)}.revision-topic h3{font-size:1.1rem;font-weight:700;color:var(--text-main);margin:0 0 .8rem}.revision-points{list-style:none;padding:0;margin:0}.revision-points li{padding:.4rem 0 .4rem 1.4rem;position:relative;font-size:.88rem;color:var(--text-muted);line-height:1.5}.revision-points li:before{content:"✓";position:absolute;left:0;color:var(--color-success);font-weight:700}.mnemonics-container,.formulas-container{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1rem}.mnemonic-card{background:#fffbeb;border:1px solid #fde68a;border-radius:var(--radius-lg);padding:1.2rem}.formula-card{background:#eff6ff;border:1px solid #bfdbfe;border-radius:var(--radius-lg);padding:1.2rem}.mnemonic-card p,.formula-card p{font-size:.9rem;line-height:1.6;margin:0;color:var(--text-muted)}.strategy-steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem}.strategy-step{display:flex;gap:1rem;align-items:flex-start;background:var(--bg-soft);border-radius:var(--radius-lg);padding:1rem}.step-number{flex-shrink:0;width:36px;height:36px;background:var(--gradient-primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1rem;font-weight:700}.step-content h3{font-size:.95rem;font-weight:700;color:var(--text-main);margin:0 0 .3rem}.step-content p{font-size:.85rem;color:var(--text-muted);line-height:1.5;margin:0}.resource-links{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:.8rem}.resource-link{display:block;background:var(--bg-card);border:1px solid var(--border-light);border-radius:var(--radius-lg);padding:1rem 1.2rem;text-decoration:none;box-shadow:var(--shadow-soft);transition:box-shadow var(--transition-fast)}.resource-link:hover{box-shadow:var(--shadow-hover)}.resource-link h3{font-size:.95rem;font-weight:700;color:var(--text-main);margin:0 0 .2rem}.resource-link p{font-size:.82rem;color:var(--text-muted);margin:0;line-height:1.5}.study-guide-footer{margin-top:2rem;padding:1.5rem;background:linear-gradient(145deg,#fff,#eef2ff);border-radius:var(--radius-lg);box-shadow:var(--shadow-soft);border:1px solid rgba(148,163,184,.2)}.revision-tips h3{font-size:1.1rem;font-weight:700;color:var(--text-main);margin:0 0 .8rem}.revision-tips ul{list-style:none;padding:0;margin:0}.revision-tips li{padding:.35rem 0 .35rem 1.5rem;position:relative;font-size:.88rem;color:var(--text-muted);line-height:1.5}.revision-tips li:before{content:"→";position:absolute;left:0;color:var(--primary-color);font-weight:700}.footer-actions{display:flex;gap:.8rem;margin-top:1.2rem}.cta-button{display:inline-flex;align-items:center;gap:.4rem;padding:.65rem 1.4rem;background:var(--gradient-primary);color:#fff;text-decoration:none;border-radius:8px;font-weight:600;font-size:.9rem;box-shadow:0 10px 20px #1d4ed833}.cta-button.secondary{background:var(--bg-card);color:var(--text-muted);box-shadow:none;border:1px solid var(--border-light)}@media (max-width: 768px){.revision-topics,.mnemonics-container,.formulas-container,.resource-links,.strategy-steps{grid-template-columns:1fr}.category-selector{justify-content:flex-start;overflow-x:auto;padding-bottom:.5rem}.category-option{flex-shrink:0}.footer-actions{flex-direction:column}.cta-button{width:100%;justify-content:center}}