:root {
    --text: #000000;
    --bg: #ffffff;
    --pattern: rgba(0, 0, 0, 0.03);
    --dots: rgba(0, 0, 0, 0.3);
    --shine: rgba(0, 0, 0, 0.95);
}

@media (prefers-color-scheme: dark) {
    :root {
        --text: #ffffff;
        --bg: #000000;
        --pattern: rgba(255, 255, 255, 0.03);
        --dots: rgba(255, 255, 255, 0.1);
        --shine: rgba(255, 255, 255, 0.95);
    }
}

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

body {
    font-family: 'IBM Plex Mono', monospace;
    background-color: var(--bg);
    background-image: 
        radial-gradient(var(--dots) 1px, transparent 1px),
        linear-gradient(var(--pattern) 1px, transparent 1px),
        linear-gradient(90deg, var(--pattern) 1px, transparent 1px);
    background-size: 
        2rem 2rem,
        2rem 2rem,
        2rem 2rem;
    background-position: 
        0 0,
        0 0,
        0 0;
    color: var(--text);
    line-height: 1.6;
    padding: 2rem;
    min-height: 100vh;
    display: grid;
    place-items: center;
}

main {
    max-width: 600px;
    width: 100%;
    text-align: center;
}

h1 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.tagline {
    font-size: 1.25rem;
    margin-bottom: 2rem;
}

.email {
    display: block;
    color: var(--text);
    margin-bottom: 2rem;
}

.email:hover {
    text-decoration: underline;
}

hr {
    border: none;
    border-top: 1px solid var(--text);
    margin-bottom: 2rem;
}

#switching-word {
    background: linear-gradient(
        to right,
        var(--text) 0%,
        var(--text) 90%,
        transparent 100%
    );
    color: var(--bg);
    padding: 0.2em 0.8em 0.2em 0.4em;
    display: inline-block;
    min-width: 7em;
    text-align: center;
    position: relative;
    isolation: isolate;
}

.twinkle {
    animation: twinkle 1s ease-in-out;
    background-size: 2rem 2rem;
}

@keyframes twinkle {
    0%, 100% { 
        background-image: radial-gradient(var(--dots) 1px, transparent 1px),
            linear-gradient(var(--pattern) 1px, transparent 1px),
            linear-gradient(90deg, var(--pattern) 1px, transparent 1px);
    }
    50% { 
        background-image: 
            linear-gradient(var(--shine) 2rem, transparent 2rem),
            linear-gradient(var(--pattern) 1px, transparent 1px),
            linear-gradient(90deg, var(--pattern) 1px, transparent 1px);
    }
}

@media (max-width: 600px) {
    body {
        padding: 1.5rem;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    .tagline {
        font-size: 1.1rem;
    }
}