*{margin:0;padding:0;box-sizing:border-box;}body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;line-height:1.6;color:#333;}.container{max-width:1280px;margin:0 auto;}.nav-links{display:flex;list-style:none;gap:3rem;margin:0;padding:0;}.nav-links a{text-decoration:none;color:#666;transition:color 0.3s;font-weight:500;}.nav-buttons{display:flex;gap:1rem;align-items:center;}.nav-button{padding:0.5rem 1rem;border:none;border-radius:5px;cursor:pointer;transition:all 0.3s;font-size:0.9rem;}.login-btn{background:transparent;color:#333;border:1px solid rgba(0,0,0,0.3);}.login-btn:hover{background:rgba(0,0,0,0.05);}.register-btn{background:rgb(78,115,223);color:white;}.register-btn:hover{background:#0056b3;}.main-content{margin-top:70px;}.help-content{padding:2rem 0;background:#f8f9fa;}.help-container{display:flex;max-width:1200px;margin:0 auto;gap:2rem;min-height:600px;}.help-sidebar{width:280px;background:white;border-radius:8px;padding:1.5rem;height:fit-content;position:sticky;top:90px;max-height:calc(100vh - 120px);overflow-y:auto;box-shadow:0 2px 8px rgba(0,0,0,0.1);}.sidebar-title{font-size:1.2rem;font-weight:600;color:#333;margin-bottom:1.5rem;padding-bottom:0.5rem;border-bottom:1px solid #e9ecef;}.sidebar-category{margin-bottom:1rem;}.category-header{display:flex;align-items:center;justify-content:space-between;padding:0.75rem 0;font-weight:500;cursor:pointer;transition:color 0.3s ease;}.category-header:hover{color:#5a6fd8;}.category-header.active{color:#667eea;font-weight:600;}.category-arrow{transition:transform 0.3s ease;}.category-header.active .category-arrow{transform:rotate(180deg);}.category-items{margin-top:0.5rem;}.category-items.collapsed{display:none;}.category-item{display:block;padding:0.5rem 0;color:#666;font-size:0.9rem;cursor:pointer;transition:color 0.3s ease;text-decoration:none;}.category-item:hover{color:#667eea;}.help-main{flex:1;background:white;border-radius:8px;padding:2rem;box-shadow:0 2px 8px rgba(0,0,0,0.1);}.content-header{margin-bottom:2rem;}.content-title{font-size:2rem;font-weight:600;color:#333;margin-bottom:0.5rem;}.content-subtitle{color:#666;font-size:1rem;}.faq-list{list-style:none;padding:0;}.faq-item{background:white;border:1px solid #e9ecef;border-radius:8px;margin-bottom:1rem;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,0.05);transition:box-shadow 0.3s ease;}.faq-item:hover{box-shadow:0 2px 6px rgba(0,0,0,0.1);}.faq-question{padding:1.5rem 1.5rem .5rem 1.5rem;font-weight:600;color:#333;font-size:1rem;margin:0;}.faq-answer{padding:0 1.5rem 1.5rem;color:#666;line-height:1.6;font-size:0.95rem;}.footer{background-color:#f8f9fa;padding:60px 0 40px;border-top:1px solid #e9ecef;}.footer-content{display:grid;grid-template-columns:2fr 1fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px;}.footer-section h3{color:rgb(78,115,223);font-size:24px;font-weight:700;margin-bottom:15px;}.footer-section h4{color:#000000;font-size:16px;font-weight:600;margin-bottom:20px;}.footer-section p{color:#4d4d4d;font-size:14px;line-height:1.6;margin:0;}.footer-section ul{list-style:none;padding:0;margin:0;}.footer-section ul li{margin-bottom:12px;}.footer-section ul li a{color:#4d4d4d;text-decoration:none;font-size:14px;transition:color 0.3s ease;}.footer-section ul li a:hover{color:#3498db;text-decoration:none;}.footer-section-1{text-align:center;}.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid #e9ecef;}.footer-bottom p{color:#4d4d4d;font-size:14px;margin:0;}.footer-bottom a{color:rgb(78,115,223);text-decoration:none;}.footer-bottom a:hover{text-decoration:underline;}@media (max-width:768px){.nav-links{display:none;}.hero-title{font-size:2.5rem;}.help-categories{grid-template-columns:1fr;gap:1.5rem;}.help-category{padding:1.5rem;}.footer-content{grid-template-columns:2fr 1fr 1fr;gap:30px;}.footer-section:nth-child(4),.footer-section:nth-child(5){grid-column:span 1;}.container{padding:0 1rem;}}