:root {
    --color-black: #000000;
    --color-black-dark: #0a0a0a;
    --color-white: #ffffff;
    --color-gray: #666666;
    --color-gray-light: #999999;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-md: 1.25rem;
    --font-size-lg: 1.75rem;
    --font-size-xl: 2.5rem;
    --border-radius: 0.5rem;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--color-black);
    color: var(--color-white);
    line-height: 1.6;
    overflow-x: hidden;
}

.main {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg) var(--spacing-sm);
    position: relative;
}

.container {
    width: 100%;
    max-width: 50rem;
    margin: 0 auto;
}

.content {
    text-align: center;
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: 300;
    margin-bottom: var(--spacing-md);
    color: var(--color-white);
    letter-spacing: 0.05em;
}

.tagline {
    font-size: var(--font-size-base);
    color: var(--color-gray);
    margin-bottom: var(--spacing-xl);
    font-weight: 300;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.blockchains {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-xl);
}

.blockchain-item {
    padding: var(--spacing-xs) var(--spacing-md);
    background: transparent;
    border: 0.0625rem solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    color: var(--color-gray-light);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 400;
    transition: var(--transition);
    backdrop-filter: blur(0.625rem);
}

.blockchain-item:hover {
    border-color: rgba(255, 255, 255, 0.3);
    color: var(--color-white);
    background: rgba(255, 255, 255, 0.05);
    transform: translateY(-0.125rem);
}

.footer {
    position: absolute;
    bottom: var(--spacing-md);
    left: 0;
    right: 0;
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-gray);
    opacity: 0.5;
}

@media (min-width: 768px) {
    .logo {
        font-size: 4rem;
    }

    .tagline {
        font-size: var(--font-size-md);
    }

    .blockchains {
        gap: var(--spacing-md);
    }

    .blockchain-item {
        font-size: var(--font-size-base);
        padding: var(--spacing-sm) var(--spacing-lg);
    }
}

@media (min-width: 1024px) {
    .logo {
        font-size: 5rem;
    }

    .tagline {
        font-size: var(--font-size-lg);
    }
}