:root {
            --primary-color: #2563eb;
            --secondary-color: #0d47a1;
            --accent-color: #10b981;
            --accent-secondary: #7c3aed;
            --text-color: #1e293b;
            --light-bg: #f8fafc;
            --dark-bg: #0f172a;
            --white: #ffffff;
            --gray: #e2e8f0;
            --gray-light: #f1f5f9;
            --border-color: #cbd5e1;
            --success-color: #10b981;
            --danger-color: #ef4444;
            --warning-color: #f59e0b;
            --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
            -webkit-tap-highlight-color: transparent;
        }
        
        body {
            background-color: var(--light-bg);
            color: var(--text-color);
            font-size: 16px;
            line-height: 1.5;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        
        a {
            text-decoration: none;
            color: var(--primary-color);
        }
        
        .app-container {
            max-width: 100%;
            margin: 0 auto;
            position: relative;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        
        /* App Header */
        .app-header {
            background-color: var(--white);
            padding: 15px 20px;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 100;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .app-logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--primary-color);
            display: flex;
            align-items: center;
        }
        
        .app-logo span {
            color: var(--accent-color);
        }
        
        .app-logo-icon {
            margin-right: 8px;
            font-size: 24px;
        }
        
        .back-button {
            background: none;
            border: none;
            font-size: 24px;
            color: var(--text-color);
            cursor: pointer;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
        }
        
        .back-button:active {
            background-color: var(--gray-light);
        }
        
        /* App Content */
        .app-content {
            flex: 1;
            padding-bottom: 60px; /* Space for bottom nav */
        }
        
        /* Page Title */
        .page-title {
            padding: 20px;
            text-align: center;
            font-size: 24px;
            font-weight: 700;
            color: var(--dark-bg);
        }
        
        /* FAQ Section */
        .faq-section {
            padding: 0 20px 30px;
        }
        
        .faq-category {
            margin-bottom: 30px;
        }
        
        .category-title {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 15px;
            padding-bottom: 8px;
            border-bottom: 2px solid var(--primary-color);
            color: var(--dark-bg);
        }
        
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        
        .faq-item {
            background-color: var(--white);
            border-radius: 12px;
            box-shadow: var(--card-shadow);
            overflow: hidden;
        }
        
        .faq-question {
            padding: 15px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .faq-toggle {
            font-size: 18px;
            color: var(--primary-color);
            transition: transform 0.3s ease;
        }
        
        .faq-toggle.open {
            transform: rotate(45deg);
        }
        
        .faq-answer {
            padding: 0 15px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            border-top: 0 solid var(--gray);
        }
        
        .faq-answer.open {
            padding: 0 15px 15px;
            max-height: 500px;
            border-top: 1px solid var(--gray);
        }
        
        .faq-answer p {
            margin-bottom: 10px;
        }
        
        .faq-answer p:last-child {
            margin-bottom: 0;
        }
        
        .faq-answer a {
            color: var(--primary-color);
            font-weight: 500;
        }
        
        /* Search Bar */
        .search-container {
            padding: 0 20px 20px;
        }
        
        .search-bar {
            display: flex;
            background-color: var(--white);
            border-radius: 8px;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
            overflow: hidden;
        }
        
        .search-input {
            flex: 1;
            padding: 12px 15px;
            border: none;
            font-size: 16px;
            outline: none;
        }
        
        .search-button {
            background-color: var(--primary-color);
            color: var(--white);
            border: none;
            padding: 0 15px;
            cursor: pointer;
            font-size: 18px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        /* Contact Support */
        .support-section {
            padding: 20px;
            text-align: center;
            background-color: var(--gray-light);
            margin: 0 20px 30px;
            border-radius: 12px;
        }
        
        .support-title {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 10px;
        }
        
        .support-text {
            margin-bottom: 15px;
            color: var(--text-color);
        }
        
        .support-button {
            display: inline-block;
            background-color: var(--primary-color);
            color: var(--white);
            padding: 10px 20px;
            border-radius: 8px;
            font-weight: 600;
        }
        
        /* Bottom Navigation */
        .bottom-nav {
            background-color: var(--white);
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            box-shadow: 0 -1px 3px rgba(0, 0, 0, 0.1);
            z-index: 100;
        }
        
        .nav-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 10px 0;
            color: #64748b;
        }
        
        .nav-item.active {
            color: var(--primary-color);
        }
        
        .nav-icon {
            font-size: 20px;
            margin-bottom: 4px;
        }
        
        .nav-label {
            font-size: 12px;
            font-weight: 500;
        }