:root {
    --primary-color: #007BFF;
    --hover-color: #0056b3;
    --secondary-color: #f8f9fa;
    --text-color: #333;
    --light-text-color: #666;
    --white-color: #fff;
    --border-color: #ddd;
    --success-color: #28a745;
    --error-color: #dc3545;
    --invest-btn-color: #00A86B;
    --invest-btn-hover: #008B56;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    background-color: var(--white-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    line-height: 1.6;
    overflow-x: hidden;
    font-size: 16px;
    font-weight: 400;
}

h1, h2 {
    font-family: 'Roboto Slab', Georgia, serif;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1.2;
}

.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 1rem;
}

.content-section h1 {
    font-size: 2.6rem;
    margin-bottom: 2rem;
}

.content-section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.content-section p, .content-section li {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    font-size: 1.1rem;
    font-weight: 400;
    text-align: left;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 1rem;
    color: var(--text-color);
}

nav a {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    font-weight: 500;
    font-size: 1rem;
    text-decoration: none;
    color: var(--primary-color);
    padding: 0.5rem 0;
    transition: color 0.3s ease, border-bottom-color 0.3s ease;
    border-bottom: 2px solid transparent;
    display: block;
}

.btn, .btn-invest, .copy-btn {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    font-weight: 500;
}

footer {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    font-size: 0.9rem;
    font-weight: 400;
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
        z-index: 101;
        margin-right: 1rem;
    }

    nav ul {
        display: none;
        flex-direction: column;
        align-items: center;
        background-color: var(--secondary-color);
        position: fixed;
        top: 60px;
        left: 0;
        width: 100vw;
        max-width: 100%;
        padding: 1.5rem 0;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        max-height: 50vh;
        overflow-y: auto;
        overflow-x: hidden;
        box-sizing: border-box;
        z-index: 99;
    }

    nav ul.active {
        display: flex;
    }

    nav ul li {
        margin: 0.75rem 0;
        width: 100%;
        text-align: center;
        padding: 0 1rem;
        box-sizing: border-box;
    }

    nav a {
        padding: 0.8rem 0;
        font-size: 1.1rem;
        display: block;
        width: 100%;
    }

    .nav-register {
        justify-content: center;
        width: 100%;
    }

    body {
        font-size: 15px;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .content-section h1 {
        font-size: 2rem;
    }

    .content-section h2 {
        font-size: 1.6rem;
    }

    .content-section p, .content-section li {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 14px;
    }

    .hero h1 {
        font-size: 1.6rem;
    }

    .content-section h1 {
        font-size: 1.8rem;
    }

    .content-section h2 {
        font-size: 1.4rem;
    }

    .content-section p, .content-section li {
        font-size: 0.9rem;
    }
}