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button{background-color:#fff;background-color:var(--background-color);border:1px solid #d1d5db;border:1px solid var(--light-gray-border);border-radius:.5rem;border-radius:var(--border-radius);cursor:pointer;padding:.75rem;text-align:left}.lesson-navigation{align-items:center;border-top:1px solid #d1d5db;border-top:1px solid var(--light-gray-border);display:flex;justify-content:space-between;margin-top:2rem;padding-top:1.5rem}.lesson-navigation button{background-color:#f3f4f6;background-color:var(--light-gray-bg);border:1px solid #d1d5db;border:1px solid var(--light-gray-border);border-radius:.5rem;border-radius:var(--border-radius);color:#374151;color:var(--dark-blue-text);cursor:pointer;font-weight:500;padding:.6rem 1.2rem}.lesson-navigation button:disabled{cursor:not-allowed;opacity:.5}.lesson-navigation button.mark-complete-btn{background-color:#4f46e5;background-color:var(--primary-blue);border:none;color:#fff}.lesson-playlist-sidebar h4{font-size:1.25rem;margin-bottom:1rem;margin-top:0}.module-section{margin-bottom:1.5rem}.module-section h5{color:#6b7280;color:var(--medium-gray-text);font-size:.9rem;font-weight:600;margin-bottom:.75rem;text-transform:uppercase}.module-section ul{list-style:none;margin:0;padding:0}.playlist-item{align-items:center;border-radius:.5rem;border-radius:var(--border-radius);cursor:pointer;display:flex;padding:.75rem;transition:background-color .2s}.playlist-item:hover{background-color:#f3f4f6;background-color:var(--light-gray-bg)}.playlist-item.active{background-color:#e0e7ff;background-color:var(--light-blue);font-weight:600}.playlist-item-status{align-items:center;display:flex;margin-right:.75rem}.playlist-item-info{align-items:center;display:flex;flex-grow:1;justify-content:space-between}.playlist-item-type-icon{opacity:.6}@media (max-width:900px){.detail-content-wrapper{grid-template-columns:1fr}.lesson-playlist-sidebar{margin-bottom:2rem;order:-1}}@media (max-width:640px){.courses-header{align-items:stretch;flex-direction:column}}:root{--primary-color:#3b82f6;--secondary-color:#1e40af;--text-dark:#1f2937;--text-light:#6b7280;--bg-light:#f9fafb;--bg-white:#fff;--border-color:#e5e7eb;--container-width:1200px}body{background-color:var(--bg-light);color:var(--text-dark);line-height:1.6}.container{margin:0 auto;max-width:1200px;max-width:var(--container-width);padding:0 1.5rem}.logged-in-navbar{background-color:#fff;background-color:var(--bg-white);border-bottom:1px solid #e5e7eb;border-bottom:1px solid var(--border-color);box-shadow:0 2px 4px #0000000d;left:0;padding:1rem 0;position:fixed;right:0;top:0;z-index:1000}.navbar-container{align-items:center;display:flex;justify-content:space-between;margin:0 auto;max-width:1200px;max-width:var(--container-width);padding:0 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h3{font-size:1.25rem;font-weight:700;margin-bottom:1rem}.options-box{background-color:#1e40af;background-color:var(--blue-800);border-radius:.75rem;display:flex;flex-direction:column;gap:.5rem;padding:1rem}.option-btn{background:none;border:none;border-radius:.5rem;color:#fff;color:var(--white);cursor:pointer;font-size:1rem;font-weight:500;padding:.75rem 1rem;text-align:left;transition:background-color .2s,color .2s;width:100%}.option-btn:hover{background-color:#2563eb80}.option-btn.active{background-color:#fff;background-color:var(--white);box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -2px #0000001a;box-shadow:var(--shadow-md);color:#2563eb;color:var(--blue-600);font-weight:600}.entrance-test-link{color:#bfdbfe;color:var(--blue-200);font-size:.875rem;margin-top:2rem}.entrance-test-link a{color:#bfdbfe;color:var(--blue-200);font-weight:700;text-decoration:underline}.entrance-test-link a:hover{color:#fff;color:var(--white)}.section-connector{margin-top:-1.25rem;position:relative;text-align:center;z-index:10}.connector-icon{background:#fff;border-radius:999px;color:#3b82f6;color:var(--blue-500);height:2.5rem;margin:auto;width:2.5rem}.enrollment-section{background-color:#fff;background-color:var(--white);padding:3rem 0 4rem}.enrollment-card{background:linear-gradient(135deg,#2563eb,#1e40af);background:linear-gradient(135deg,var(--blue-600) 0,var(--blue-800) 100%);border-radius:1.5rem;box-shadow:0 20px 25px -5px #0000001a,0 8px 10px -6px #0000001a;box-shadow:var(--shadow-xl);color:#fff;color:var(--white);margin:0 auto;max-width:800px;padding:2.5rem;position:relative;z-index:5}.enrollment-card h3{color:#fff;font-size:1.75rem;font-weight:700;margin:0 0 1.5rem;opacity:1;text-align:center}.cta-button{background-color:#fff;background-color:var(--white);border:none;border-radius:.75rem;box-shadow:0 10px 15px -3px #0000001a,0 4px 6px -4px 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