:root {
    --background-color-light: #f0f2f5;
    --container-bg-light: #ffffff;
    --text-color-light: #333;
    --button-bg-light: #007aff;
    --button-hover-bg-light: #0056b3;

    --background-color-dark: #121212;
    --container-bg-dark: #1e1e1e;
    --text-color-dark: #e0e0e0;
    --button-bg-dark: #007aff;
    --button-hover-bg-dark: #3391ff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: var(--background-color-light);
    transition: background-color 0.3s ease;
}

.container {
    text-align: center;
    padding: 3rem;
    background-color: var(--container-bg-light);
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    animation: fadeInSlideUp 0.8s ease-out forwards;
    opacity: 0;
}

.logo {
    margin-bottom: 1.5rem;
    max-width: 80vw;
}

.instructions {
    margin: 1.5rem 0;
    color: var(--text-color-light);
    font-size: 1.1rem;
    line-height: 1.6;
}

@keyframes fadeInSlideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

a {
    color: var(--button-bg-light);
}

h1 {
    font-size: 1.75rem;
    color: var(--text-color-light);
    margin-bottom: 1.5rem;
}

.download-button {
    display: inline-block;
    padding: 0.85rem 1.75rem;
    background-color: var(--button-bg-light);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
    box-shadow: 0 4px 12px rgba(0, 122, 255, 0.3);
}

.download-button:hover {
    background-color: var(--button-hover-bg-light);
    transform: translateY(-3px);
    box-shadow: 0 6px 16px rgba(0, 122, 255, 0.4);
}

/* Dark Mode Styles */
@media (prefers-color-scheme: dark) {
    body {
        background-color: var(--background-color-dark);
    }
    .container {
        background-color: var(--container-bg-dark);
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    }
    h1 {
        color: var(--text-color-dark);
    }
    .instructions {
        color: var(--text-color-dark);
    }
    .download-button {
        background-color: var(--button-bg-dark);
        box-shadow: 0 4px 12px rgba(0, 122, 255, 0.5);
    }
    .download-button:hover {
        background-color: var(--button-hover-bg-dark);
        box-shadow: 0 6px 16px rgba(0, 122, 255, 0.6);
    }
}