:root {
            --primary-color: #4a6cf7;
            --secondary-color: #f97316;
            --background-light: #f8fafc;
            --text-light: #334155;
            --background-dark: #0f172a;
            --text-dark: #e2e8f0;
            --gray-100: #f3f4f6;
            --gray-200: #e5e7eb;
            --gray-300: #d1d5db;
            --gray-700: #374151;
            --gray-800: #1f2937;
            --gray-900: #111827;
            --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
            --transition: all 0.3s ease;
            --radius: 0.5rem;
        }
        
        /* Light/Dark mode specific variables */
        body.light-mode {
            --background: var(--background-light);
            --text: var(--text-light);
            --card-bg: white;
            --card-border: var(--gray-200);
            --hover-bg: var(--gray-100);
        }
        
        body.dark-mode {
            --background: var(--background-dark);
            --text: var(--text-dark);
            --card-bg: var(--gray-800);
            --card-border: var(--gray-700);
            --hover-bg: var(--gray-700);
        }
        
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        
        html {
            font-size: 16px;
            scroll-behavior: smooth;
        }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
            background-color: var(--background);
            color: var(--text);
            line-height: 1.6;
            transition: var(--transition);
        }
        
        header {
            background-color: var(--card-bg);
            box-shadow: var(--shadow);
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 100;
        }
        
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    overflow-x: visible;
}
        
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .logo {
            display: flex;
            align-items: center;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary-color);
            text-decoration: none;
        }
        
        .logo svg {
            margin-right: 0.5rem;
        }
        
        nav ul {
            display: flex;
            list-style: none;
        }
        
        nav li {
            margin-left: 1.5rem;
        }
        
        nav a {
            color: var(--text);
            text-decoration: none;
            font-weight: 500;
            transition: var(--transition);
        }
        
        nav a:hover {
            color: var(--primary-color);
        }
        
        .header-actions {
            display: flex;
            align-items: center;
        }
        
        .mode-toggle {
            background: none;
            border: none;
            color: var(--text);
            cursor: pointer;
            font-size: 1.5rem;
            margin-left: 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            color: var(--text);
            cursor: pointer;
            font-size: 1.5rem;
        }
        
        .hero {
            padding: 4rem 0;
            text-align: center;
        }
        
        .hero h1 {
            font-size: 3rem;
            font-weight: 800;
            margin-bottom: 1rem;
            background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        
        .hero p {
            font-size: 1.25rem;
            max-width: 650px;
            margin: 0 auto 2rem;
            color: var(--text);
        }
        
        .search-container {
            max-width: 600px;
            margin: 0 auto;
            position: relative;
        }
        
        .search-input {
            width: 100%;
            padding: 1rem 1.5rem;
            padding-right: 3rem;
            font-size: 1rem;
            border: 2px solid var(--card-border);
            border-radius: var(--radius);
            background-color: var(--card-bg);
            color: var(--text);
            transition: var(--transition);
        }
        
        .search-input:focus {
            outline: none;
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(74, 108, 247, 0.2);
        }
        
        .search-btn {
            position: absolute;
            right: 1rem;
            top: 50%;
            transform: translateY(-50%);
            background: none;
            border: none;
            color: var(--text);
            cursor: pointer;
            font-size: 1.25rem;
        }
        
.tabs {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    margin: 2rem 0;
    border-bottom: 1px solid var(--card-border);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scroll-snap-type: x mandatory;
    gap: 0.5rem;
    padding-bottom: 0.5rem;

    width: 100%;
    max-width: 100vw;
    flex-wrap: nowrap;
    touch-action: pan-x;

    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) var(--card-bg);
}
.tabs::-webkit-scrollbar {
    height: 6px;
}
.tabs::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 3px;
}
.tabs::-webkit-scrollbar-track {
    background: var(--card-bg);
}
        
.tab {
    padding: 0.75rem 1.5rem;
    font-weight: 500;
    color: var(--text);
    background: none;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    scroll-snap-align: start;
    white-space: nowrap;
    min-width: 90px;
    flex: 0 0 auto;
    box-sizing: border-box;
}
        
        .tab.active {
            background-color: var(--primary-color);
            color: white;
        }
        
        .tab:hover:not(.active) {
            background-color: var(--hover-bg);
        }
        
        .symbol-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
            gap: 1rem;
            margin-bottom: 3rem;
            position: relative; /* For positioning no-symbols message */
        }
        .symbol-grid .no-symbols-message {
            grid-column: 1 / -1; /* Span all columns */
            text-align: center;
            padding: 2rem;
            color: var(--text);
        }
        
        .symbol-card {
            background-color: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--radius);
            padding: 1.5rem 1rem;
            text-align: center;
            transition: var(--transition);
            cursor: pointer;
            position: relative;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        
        .symbol-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow);
        }
        
        .symbol {
            font-size: 2.5rem;
            margin-bottom: 0.5rem;
            flex-grow: 1;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .symbol-name {
            font-size: 0.85rem;
            color: var(--text);
            margin-bottom: 0.5rem;
            word-break: break-word;
        }
        
        .symbol-unicode {
            font-size: 0.75rem;
            color: var(--primary-color);
            font-family: monospace;
        }
        
        .favorite-btn {
            position: absolute;
            top: 0.5rem;
            right: 0.5rem;
            background: none;
            border: none;
            color: var(--gray-300);
            cursor: pointer;
            font-size: 1.25rem;
            transition: var(--transition);
            z-index: 10; /* Ensure it's above other card content if overlap occurs */
        }
        
        .favorite-btn.active {
            color: var(--secondary-color);
        }
        
        .modal {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 1000;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.3s ease, visibility 0.3s ease;
        }
        
        .modal.active {
            opacity: 1;
            visibility: visible;
        }
        
        .modal-content {
            background-color: var(--card-bg);
            border-radius: var(--radius);
            width: 90%;
            max-width: 800px;
            max-height: 90vh;
            overflow-y: auto;
            padding: 2rem;
            position: relative;
            transform: translateY(20px) scale(0.95);
            transition: transform 0.3s ease, opacity 0.3s ease;
            opacity: 0;
        }
        
        .modal.active .modal-content {
            transform: translateY(0) scale(1);
            opacity: 1;
        }
        
        .close-modal {
            position: absolute;
            top: 1rem;
            right: 1rem;
            background: none;
            border: none;
            color: var(--text);
            font-size: 1.5rem;
            cursor: pointer;
        }
        
        .detail-header {
            text-align: center;
            margin-bottom: 2rem;
        }
        
        .detail-symbol {
            font-size: 5rem; /* Default, can be changed by slider */
            margin: 1rem 0;
            transition: var(--transition); /* For font size changes */
        }
        
        .detail-title {
            font-size: 1.5rem;
            margin-bottom: 0.5rem;
        }
        
        .detail-subtitle {
            color: var(--primary-color);
            font-family: monospace;
            margin-bottom: 0.5rem;
        }
        .detail-description {
            font-size: 0.95rem;
            margin-bottom: 1.5rem;
            color: var(--text);
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }
        
        .detail-controls {
            display: flex;
            justify-content: center;
            gap: 1rem;
            margin: 1rem 0 2rem;
            flex-wrap: wrap;
            align-items: center; /* Prevent stretch */
        }
        
        .btn {
            padding: 0.75rem 1.5rem;
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: var(--radius);
            font-weight: 500;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        
        .btn:hover {
            background-color: #3a5bd9;
        }
        
        .btn-outline {
            background-color: transparent;
            color: var(--primary-color);
            border: 1px solid var(--primary-color);
        }
        
        .btn-outline:hover {
            background-color: var(--primary-color);
            color: white;
        }
        
        .btn-secondary {
            background-color: var(--secondary-color);
        }
        
        .btn-secondary:hover {
            background-color: #e86207;
        }

        /* Prevent favoriteBtn in modal from resizing on label change */
        #favoriteBtn {
            min-width: 170px;
            max-width: 200px;
            width: 180px;
            height: 48px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            box-sizing: border-box;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            padding: 0 1rem;
        }
        
        .detail-section {
            margin-bottom: 2rem;
        }
        
        .detail-section h3 {
            font-size: 1.25rem;
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 1px solid var(--card-border);
        }
        
        .code-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); /* Adjusted minmax for better fit */
            gap: 1rem;
        }
        
        .code-item {
            background-color: var(--hover-bg);
            border-radius: var(--radius);
            padding: 1rem;
            position: relative;
        }
        
        .code-title {
            font-size: 0.9rem;
            margin-bottom: 0.5rem;
            color: var(--text);
        }
        
        .code-content {
            font-family: monospace;
            background-color: var(--card-bg);
            padding: 0.75rem;
            border-radius: var(--radius);
            margin-bottom: 0.5rem;
            white-space: pre-wrap;
            word-break: break-all;
            font-size: 0.85rem;
        }
        
        .copy-btn {
            position: absolute;
            top: 1rem;
            right: 1rem;
            background: none;
            border: none;
            color: var(--text);
            cursor: pointer;
            font-size: 1rem;
        }
        
        .related-symbols {
            display: flex;
            gap: 1rem;
            overflow-x: auto;
            padding: 0.5rem 0;
            scroll-snap-type: x mandatory;
            -webkit-overflow-scrolling: touch;
        }
        
        .related-symbol {
            scroll-snap-align: start;
            background-color: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--radius);
            padding: 1rem 0.75rem;
            text-align: center;
            min-width: 100px;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            align-items: center;
        }
         .related-symbol .symbol { font-size: 1.8rem; margin-bottom: 0.3rem;}
         .related-symbol .symbol-name { font-size: 0.75rem; }
        
        .related-symbol:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow);
        }
        
        .font-preview {
            margin-top: 1rem;
        }
        
        .font-list {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
            margin-top: 1rem;
        }
        
        .font-item {
            background-color: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: var(--radius);
            padding: 1rem;
            min-width: 130px;
            text-align: center;
        }
        
        .font-symbol {
            font-size: 2rem;
            margin-bottom: 0.5rem;
        }
        
        .font-name {
            font-size: 0.8rem;
        }
        
        .size-adjuster {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 1rem;
            margin: 1rem 0;
        }
        
        .size-slider {
            width: 200px;
            -webkit-appearance: none;
            appearance: none;
            height: 5px;
            border-radius: 5px;
            background: var(--card-border);
            outline: none;
        }
        
        .size-slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--primary-color);
            cursor: pointer;
        }
        
        .size-slider::-moz-range-thumb {
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--primary-color);
            cursor: pointer;
            border: none;
        }
        
        .size-value {
            font-size: 0.9rem;
            min-width: 40px;
            text-align: center;
        }
        
        .tab-content {
            display: none;
        }
        
        .tab-content.active {
            display: block;
        }
        
        .features-section {
            padding: 4rem 0;
            background-color: var(--hover-bg);
        }
        
        .section-title {
            text-align: center;
            font-size: 2rem;
            margin-bottom: 3rem;
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
        }
        
        .feature-card {
            background-color: var(--card-bg);
            border-radius: var(--radius);
            padding: 2rem;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        
        .feature-card:hover {
            transform: translateY(-5px);
        }
        
        .feature-icon {
            font-size: 2.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        
        .feature-title {
            font-size: 1.25rem;
            margin-bottom: 1rem;
        }
        
        .how-to-section {
            padding: 4rem 0;
        }
        
        .steps {
            margin-top: 2rem;
        }
        
        .step {
            display: flex;
            margin-bottom: 2rem;
            gap: 1.5rem;
        }
        
        .step-number {
            background-color: var(--primary-color);
            color: white;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            flex-shrink: 0;
        }
        
        .step-content h3 {
            margin-bottom: 0.5rem;
        }
        
        .faq-section {
            padding: 4rem 0;
            background-color: var(--hover-bg);
        }
        
        .faq-item {
            margin-bottom: 1rem;
            border: 1px solid var(--card-border);
            border-radius: var(--radius);
            background-color: var(--card-bg);
            overflow: hidden;
        }
        
        .faq-question {
            padding: 1.5rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 500;
        }
        
        .faq-answer {
            padding: 0 1.5rem;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
        }
        
        .faq-answer.active {
            padding: 0 1.5rem 1.5rem;
            /* max-height will be set by JS */
        }
        
        .faq-icon {
            transition: transform 0.3s ease;
        }
        
        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }
        
        .about-section {
            padding: 4rem 0;
        }
        
        .about-content {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            align-items: center;
        }
        
        .about-image {
            width: 100%;
            border-radius: var(--radius);
        }
        
        footer {
            background-color: var(--card-bg);
            padding: 3rem 0;
            text-align: center;
            box-shadow: 0 -1px 5px rgba(0, 0, 0, 0.1);
        }
        
        .footer-links {
            display: flex;
            justify-content: center;
            gap: 2rem;
            margin: 1.5rem 0;
            flex-wrap: wrap;
        }
        
        .footer-link {
            color: var(--text);
            text-decoration: none;
            transition: var(--transition);
        }
        
        .footer-link:hover {
            color: var(--primary-color);
        }
        
        .social-links {
            display: flex;
            justify-content: center;
            gap: 1.5rem;
            margin-bottom: 1.5rem;
        }
        
        .social-link {
            color: var(--text);
            font-size: 1.5rem;
            transition: var(--transition);
        }
        
        .social-link:hover {
            color: var(--primary-color);
        }
        
        .copyright {
            font-size: 0.9rem;
            color: var(--text);
        }
        
        /* Toast notification */
        .toast {
            position: fixed;
            bottom: 2rem;
            left: 50%;
            transform: translateX(-50%) translateY(100px);
            background-color: var(--card-bg);
            color: var(--text);
            padding: 1rem 1.5rem;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            display: flex;
            align-items: center;
            gap: 0.5rem;
            z-index: 1000;
            opacity: 0;
            transition: all 0.3s ease;
        }
        
        .toast.active {
            transform: translateX(-50%) translateY(0);
            opacity: 1;
        }
        
        .toast-icon {
            color: var(--primary-color);
        }
        
        /* Responsive styles */
@media (max-width: 768px) {
    .header-container {
        /* flex-direction: column; Remove this to keep logo and hamburger on same line */
        /* align-items: flex-start; */
         position: relative; /* For absolute positioning of mobile menu button */
    }
    
    .mobile-menu-btn {
        display: block;
        position: absolute; /* Keep it relative to header-container */
        top: 50%;
        transform: translateY(-50%);
        right: 1.5rem;
    }
    .logo { /* Ensure logo does not get pushed by absolute positioned button */
        margin-right: 50px; /* Space for the hamburger menu */
    }
    
    nav {
        width: 100%;
        max-height: 0; /* Use max-height for transition */
        overflow: hidden;
        transition: max-height 0.3s ease-in-out;
         position: absolute; /* Take out of flow for smoother transition */
         top: 100%; /* Position below the header */
         left: 0;
         background-color: var(--card-bg); /* Give it a background */
         box-shadow: var(--shadow);
         z-index: 99; /* Below header but above content */
    }
    
    nav.active {
        max-height: 500px; /* Adjust as needed for content */
        /* margin-top: 1rem; Removed as it's absolutely positioned */
    }
    
    nav ul {
        flex-direction: column;
        padding: 1rem 1.5rem; /* Add padding when menu is open */
    }
    
    nav li {
        margin: 0.5rem 0;
        margin-left: 0;
    }
    
    .hero h1 {
        font-size: 2.2rem;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .tab {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
        min-width: 90px;
    }
}
        
/* Ad Container Styles */
.ad-container {
    margin: 2rem auto;
    text-align: center;
    overflow: hidden;
    clear: both;
}

/* Top Banner Ad (728x90) */
.banner-728x90 {
    max-width: 728px;
    margin: 1rem auto;
    display: flex;
    justify-content: center;
    background: var(--card-bg);
    border-radius: var(--radius);
}

/* Grid with Ad Layout */
.grid-with-ad {
    display: grid;
    gap: 2rem;
    grid-template-columns: 1fr;
    align-items: start;
}

/* Medium Rectangle Ad (300x250) */
.banner-300x250 {
    width: 300px;
    margin: 0 auto;
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1rem;
}

/* Desktop Layout */
@media (min-width: 1024px) {
    .grid-with-ad {
        grid-template-columns: 1fr 300px;
        gap: 2rem;
        max-width: 1200px;
        margin: 0 auto;
    }
    
    .banner-300x250 {
        position: sticky;
        top: 100px;
        margin: 0;
    }
}

/* Native Banner Ad Container */
.native-banner-container {
    max-width: 800px;
    margin: 2rem auto;
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1rem;
}

/* Mobile Banner Ad (320x50) */
.mobile-banner {
    display: none;
    max-width: 320px;
    margin: 1rem auto;
}

/* Social Bar Container */
.social-bar-container {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--card-bg);
}

/* Responsive Design */
@media (max-width: 768px) {
    .banner-728x90 {
        display: none; /* Hide large banner on mobile */
    }
    
    .banner-300x250 {
        float: none;
        margin: 1rem auto;
    }
    
    .mobile-banner {
        display: block; /* Show mobile banner */
    }
}

@media (max-width: 480px) {
    .symbol-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    }
    
    .detail-symbol {
        font-size: 4rem;
    }
    
    .detail-controls {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    .code-grid {
        grid-template-columns: 1fr; /* Stack code items on small screens */
    }
    .tab {
        padding: 0.4rem 0.7rem;
        font-size: 0.8rem;
        min-width: 80px;
    }
}