:root {
            --primary: #2c3e50;
            --primary-light: #4361ee;
            --secondary: #3498db;
            --accent: #f39c12;
            --light: #ecf0f1;
            --dark: #2c3e50;
            --success: #27ae60;
            --warning: #f39c12;
            --danger: #e74c3c;
            --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Poppins', sans-serif;
        }
        
        body {
            background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
            color: #333;
            line-height: 1.6;
            min-height: 100vh;
            padding-bottom: 80px;
        }
        
        .navbar {
            background: linear-gradient(120deg, var(--primary), var(--secondary));
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            padding: 10px 0;
        }
        
        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
            display: flex;
            align-items: center;
        }
        
        .back-button {
            color: white;
            margin-right: 15px;
            font-size: 1.2rem;
            transition: var(--transition);
        }
        
        .back-button:hover {
            transform: translateX(-3px);
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* Header Section */
        .help-header {
            background: linear-gradient(120deg, var(--primary), var(--secondary));
            color: white;
            padding: 40px 30px;
            border-radius: 15px;
            margin: 100px auto 30px;
            box-shadow: var(--card-shadow);
            text-align: center;
        }
        
        .search-box {
            max-width: 600px;
            margin: 20px auto;
            position: relative;
        }
        
        .search-box input {
            width: 100%;
            padding: 15px 20px;
            border-radius: 50px;
            border: none;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            font-size: 16px;
        }
        
        .search-box button {
            position: absolute;
            right: 5px;
            top: 5px;
            background: var(--secondary);
            border: none;
            color: white;
            width: 45px;
            height: 45px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        /* Help Categories */
        .help-categories {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin-bottom: 40px;
        }
        
        .category-card {
            background: white;
            border-radius: 15px;
            padding: 25px;
            box-shadow: var(--card-shadow);
            transition: var(--transition);
            text-align: center;
            cursor: pointer;
        }
        
        .category-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
        }
        
        .category-icon {
            width: 70px;
            height: 70px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 28px;
            color: white;
        }
        
        .bg-deposit {
            background: linear-gradient(120deg, var(--success), #219653);
        }
        
        .bg-withdraw {
            background: linear-gradient(120deg, var(--secondary), #2980b9);
        }
        
        .bg-invest {
            background: linear-gradient(120deg, var(--accent), #e67e22);
        }
        
        .bg-account {
            background: linear-gradient(120deg, var(--primary-light), #3a0ca3);
        }
        
        .category-card h3 {
            margin-bottom: 10px;
            color: var(--dark);
        }
        
        .category-card p {
            color: #6c757d;
            font-size: 14px;
        }
        
        /* FAQ Section */
        .faq-section {
            background: white;
            border-radius: 20px;
            padding: 30px;
            margin-bottom: 30px;
            box-shadow: var(--card-shadow);
        }
        
        .section-title {
            color: var(--dark);
            margin-bottom: 25px;
            font-weight: 700;
            position: relative;
            padding-bottom: 15px;
        }
        
        .section-title:after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 3px;
            background: linear-gradient(to right, var(--primary), var(--secondary));
            border-radius: 3px;
        }
        
        .accordion-item {
            border: none;
            border-radius: 10px;
            margin-bottom: 15px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            overflow: hidden;
        }
        
        .accordion-button {
            background: white;
            border: none;
            padding: 20px;
            font-weight: 600;
            color: var(--dark);
            box-shadow: none;
        }
        
        .accordion-button:not(.collapsed) {
            background: #f8f9fa;
            color: var(--primary);
        }
        
        .accordion-body {
            padding: 20px;
            background: #f8f9fa;
            color: #495057;
        }
        
        /* Contact Section */
        .contact-section {
            background: white;
            border-radius: 20px;
            padding: 30px;
            margin-bottom: 30px;
            box-shadow: var(--card-shadow);
        }
        
        .contact-methods {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
            margin-top: 20px;
        }
        
        .contact-card {
            background: #f8f9fa;
            border-radius: 15px;
            padding: 25px;
            text-align: center;
            transition: var(--transition);
        }
        
        .contact-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
        }
        
        .contact-icon {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 15px;
            font-size: 24px;
            color: white;
            background: var(--secondary);
        }
        
        .contact-card h4 {
            margin-bottom: 10px;
            color: var(--dark);
        }
        
        .contact-card p {
            color: #6c757d;
            margin-bottom: 15px;
        }
        
        .contact-card a {
            color: var(--secondary);
            text-decoration: none;
            font-weight: 500;
        }
        
        /* Bottom Navigation */
        .bottom-nav {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background: white;
            display: flex;
            justify-content: space-around;
            padding: 15px 0;
            box-shadow: 0 -5px 20px rgba(0, 0, 0, 0.08);
            z-index: 1000;
        }

        .nav-item {
            text-align: center;
            color: #888;
            text-decoration: none;
            font-size: 12px;
            transition: var(--transition);
        }

        .nav-item.active {
            color: var(--primary);
        }

        .nav-item i {
            font-size: 22px;
            margin-bottom: 5px;
            display: block;
        }

        .nav-item div {
            font-weight: 500;
        }

        .nav-item:hover {
            color: var(--primary);
            transform: translateY(-3px);
        }
        
        /* Responsive */
        @media (max-width: 768px) {
            .help-categories, .contact-methods {
                grid-template-columns: 1fr;
            }
            
            .help-header {
                margin: 80px auto 30px;
                padding: 25px 20px;
            }
            
            .navbar-brand {
                font-size: 1.3rem;
            }
            
            .search-box {
                margin: 15px auto;
            }
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .help-header, .category-card, .faq-section, .contact-section {
            animation: fadeIn 0.6s ease-out;
        }