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:root{--bg-primary:#f6f8fa;--bg-card:#fff;--text-primary:#1a1a1a;--text-secondary:#4a4a4a;--accent-color:#1a56db;--accent-hover:#1e40af;--border-color:#e5e7eb;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -1px #0000000f;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -2px #0000000d;--max-width:1200px;--spacing-sm:.75rem;--spacing-md:1.5rem;--spacing-lg:3rem}*{box-sizing:border-box;margin:0;padding:0}html,body{background-color:var(--bg-primary);width:100%;height:100%;color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-sans), system-ui, -apple-system, sans-serif;flex-direction:column;font-size:1.15rem;line-height:1.6;display:flex}h1,h2,h3,h4,h5,h6{color:var(--text-primary);margin-bottom:var(--spacing-sm);font-weight:700;line-height:1.25}h1{font-size:2.25rem}h2{font-size:1.75rem}h3{font-size:1.4rem}p{margin-bottom:1.25rem}.article-body{font-family:var(--font-serif), Georgia, 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var(--border-color);z-index:100;box-shadow:var(--shadow-sm);position:sticky;top:0}.header-container{justify-content:space-between;align-items:center;height:80px;display:flex}.logo{color:var(--text-primary);align-items:center;font-size:1.5rem;font-weight:800;text-decoration:none;display:flex}.logo span{color:var(--accent-color)}.nav-menu{gap:var(--spacing-md);list-style:none;display:flex}.nav-link{color:var(--text-secondary);border-radius:4px;padding:.5rem .75rem;font-size:1.1rem;font-weight:600;text-decoration:none;transition:color .15s,background-color .15s}.nav-link:hover,.nav-link:focus{color:var(--accent-color);background-color:var(--bg-primary)}.nav-link.active{color:var(--accent-color);border-bottom:3px solid var(--accent-color);border-radius:0}.footer-wrapper{background-color:var(--text-primary);color:#fff;border-top:1px solid var(--border-color);padding:var(--spacing-lg) 0;margin-top:auto}.footer-container{gap:var(--spacing-md);grid-template-columns:1fr;display:grid}@media (min-width:768px){.footer-container{grid-template-columns:2fr 1fr 1fr}}.footer-section h3{color:#fff;margin-bottom:var(--spacing-md);font-size:1.3rem}.footer-section p{color:#a3a3a3;font-size:1rem}.footer-links{padding:0;list-style:none}.footer-links li{margin-bottom:.75rem}.footer-links a{color:#a3a3a3;font-size:1.05rem;text-decoration:none}.footer-links a:hover,.footer-links a:focus{color:#fff;text-decoration:underline}.footer-bottom{text-align:center;margin-top:var(--spacing-md);padding-top:var(--spacing-md);color:#737373;border-top:1px solid #2d2d2d;font-size:.95rem}.grid-cols-3{gap:var(--spacing-md);grid-template-columns:1fr;display:grid}@media (min-width:768px){.grid-cols-3{grid-template-columns:repeat(3,1fr)}}.grid-cols-2{gap:var(--spacing-md);grid-template-columns:1fr;display:grid}@media (min-width:768px){.grid-cols-2{grid-template-columns:repeat(2,1fr)}}.card{background-color:var(--bg-card);border:1px solid var(--border-color);padding:var(--spacing-md);box-shadow:var(--shadow-sm);border-radius:8px;flex-direction:column;transition:transform .15s,box-shadow .15s;display:flex}.card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.card-category{text-transform:uppercase;color:var(--accent-color);margin-bottom:.5rem;font-size:.95rem;font-weight:700}.card-title{margin-bottom:.75rem;font-size:1.4rem}.card-title a{color:var(--text-primary);text-decoration:none}.card-title a:hover{color:var(--accent-color)}.card-description{color:var(--text-secondary);margin-bottom:var(--spacing-md);font-size:1.05rem}.card-meta{color:#737373;margin-top:auto;font-size:.95rem}.category-badge{color:var(--accent-color);text-transform:uppercase;background-color:#eff6ff;border-radius:9999px;padding:.25rem .75rem;font-size:.9rem;font-weight:700;display:inline-block;text-decoration:none!important}.category-badge:hover{background-color:#dbeafe}.category-grid{gap:var(--spacing-sm);margin:var(--spacing-md) 0;grid-template-columns:repeat(2,1fr);display:grid}@media (min-width:768px){.category-grid{grid-template-columns:repeat(6,1fr)}}.category-card{background-color:var(--bg-card);border:1px solid var(--border-color);text-align:center;color:var(--text-primary);box-shadow:var(--shadow-sm);border-radius:8px;padding:1.25rem;font-weight:700;text-decoration:none;transition:background-color .15s,border-color .15s}.category-card:hover{border-color:var(--accent-color);background-color:#eff6ff}.layout-with-sidebar{gap:var(--spacing-lg);margin-top:var(--spacing-md);margin-bottom:var(--spacing-lg);grid-template-columns:1fr;display:grid}@media (min-width:1024px){.layout-with-sidebar{grid-template-columns:2.5fr 1.2fr}}.main-article-content{background-color:var(--bg-card);border:1px solid var(--border-color);padding:var(--spacing-md);box-shadow:var(--shadow-sm);border-radius:8px}@media (min-width:768px){.main-article-content{padding:var(--spacing-lg)}}.sidebar-content{gap:var(--spacing-md);flex-direction:column;display:flex}.sidebar-widget{background-color:var(--bg-card);border:1px solid var(--border-color);padding:var(--spacing-md);box-shadow:var(--shadow-sm);border-radius:8px}.sidebar-title{border-bottom:2px solid var(--border-color);margin-bottom:1rem;padding-bottom:.5rem;font-size:1.3rem;font-weight:700}.sidebar-list{flex-direction:column;gap:1rem;list-style:none;display:flex}.sidebar-item{border-bottom:1px solid var(--border-color);padding-bottom:.75rem}.sidebar-item:last-child{border-bottom:none;padding-bottom:0}.sidebar-item-category{text-transform:uppercase;color:var(--accent-color);margin-bottom:.25rem;font-size:.85rem;font-weight:700}.sidebar-item-title{font-size:1.1rem;font-weight:600;line-height:1.3}.sidebar-item-title a{color:var(--text-primary);text-decoration:none}.sidebar-item-title a:hover{color:var(--accent-color);text-decoration:underline}.ad-container{margin:var(--spacing-md) 0;background-color:#f3f4f6;border:1px dashed #d1d5db;border-radius:4px;justify-content:center;align-items:center;display:flex;overflow:hidden}.ad-label{color:#9ca3af;text-transform:uppercase;letter-spacing:.05em;background-color:#e5e7eb;padding:.25rem .5rem;font-size:.75rem}.form-group{margin-bottom:1.5rem}.form-group label{margin-bottom:.5rem;font-size:1.1rem;font-weight:700;display:block}.form-control{border:1px solid var(--border-color);border-radius:4px;width:100%;padding:.75rem;font-family:inherit;font-size:1.1rem}.form-control:focus{border-color:var(--accent-color);outline:none;box-shadow:0 0 0 3px #2563eb26}.btn-primary{background-color:var(--accent-color);color:#fff;cursor:pointer;text-align:center;border:none;border-radius:4px;padding:.75rem 1.5rem;font-size:1.15rem;font-weight:700;transition:background-color .15s;display:inline-block;text-decoration:none!important}.btn-primary:hover,.btn-primary:focus{background-color:var(--accent-hover)}.article-intro{color:var(--text-secondary);font-size:1.35rem;line-height:1.7;font-family:var(--font-serif), Georgia, serif;border-left:4px solid var(--accent-color);margin-bottom:2rem;padding-left:1.25rem}.tips-container{box-shadow:var(--shadow-sm);background-color:#f0fdf4;border:1px solid #bbf7d0;border-left:6px solid #16a34a;border-radius:8px;margin:2.5rem 0;padding:1.5rem}.tips-heading{color:#14532d;align-items:center;gap:.5rem;margin-bottom:.5rem;font-size:1.5rem;display:flex}.tips-intro{color:#166534;margin-bottom:1rem;font-size:1.1rem}.tips-list{padding:0;list-style:none}.tips-list li{color:#1f2937;margin-bottom:.75rem;padding-left:2rem;font-size:1.15rem;position:relative}.tips-list li:before{content:"✓";color:#16a34a;font-size:1.2rem;font-weight:700;position:absolute;top:0;left:0}.mistakes-container{box-shadow:var(--shadow-sm);background-color:#fef2f2;border:1px solid #fecaca;border-left:6px solid #dc2626;border-radius:8px;margin:2.5rem 0;padding:1.5rem}.mistakes-heading{color:#7f1d1d;margin-bottom:.5rem;font-size:1.5rem}.mistakes-intro{color:#991b1b;margin-bottom:1rem;font-size:1.1rem}.mistakes-list{padding:0;list-style:none}.mistakes-list li{color:#1f2937;margin-bottom:.75rem;padding-left:2rem;font-size:1.15rem;position:relative}.mistakes-list li:before{content:"✗";color:#dc2626;font-size:1.2rem;font-weight:700;position:absolute;top:0;left:0}.faq-section-title{border-bottom:2px solid var(--border-color);margin-top:3rem;margin-bottom:1.5rem;padding-bottom:.5rem;font-size:1.85rem}.faq-details{background-color:var(--bg-card);border:1px solid var(--border-color);border-radius:6px;margin-bottom:1rem;transition:box-shadow .15s;overflow:hidden}.faq-details[open]{box-shadow:var(--shadow-sm)}.faq-summary{cursor:pointer;-webkit-user-select:none;user-select:none;background-color:#f9fafb;justify-content:space-between;align-items:center;padding:1rem 1.25rem;font-size:1.2rem;font-weight:700;list-style:none;display:flex}.faq-summary::-webkit-details-marker{display:none}.faq-summary:after{content:"+";color:var(--text-secondary);font-size:1.5rem;font-weight:400}.faq-details[open] .faq-summary:after{content:"−"}.faq-answer{border-top:1px solid var(--border-color);background-color:#fff;padding:1.25rem;font-size:1.15rem;line-height:1.6}