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

body {
    --bg-color: #f8f8f8;
    --text-color: #2d2d2d;
    --link-color: #0066cc;
    --link-hover-color: #0052a3;
    --border-color: #d0d0d0;
    --button-bg: #e8e8e8;
    --button-text: #2d2d2d;
    --button-hover: #d8d8d8;

    font-family: 'SF Mono', 'Consolas', 'Liberation Mono', monospace;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s ease, color 0.3s ease;
    padding: 2rem;
}

body.dark-mode {
    --bg-color: #0d1117;
    --text-color: #c9d1d9;
    --link-color: #58a6ff;
    --link-hover-color: #79c0ff;
    --border-color: #30363d;
    --button-bg: #161b22;
    --button-text: #c9d1d9;
    --button-hover: #21262d;
}

.theme-toggle {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
}

#theme-switch {
    background: none;
    color: var(--text-color);
    border: none;
    padding: 0.5rem;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.2s ease;
    opacity: 0.4;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
}

#theme-switch:hover {
    opacity: 1;
}

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

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-color);
    opacity: 0.7;
    margin-bottom: 3rem;
    font-weight: 400;
}

.contact-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    background: var(--button-bg);
    border: 2px solid var(--border-color);
    border-radius: 4px;
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.2s ease;
    width: 100%;
    max-width: 300px;
    font-size: 1rem;
    font-weight: 500;
}

.contact-item:hover {
    background: var(--button-hover);
    border-color: var(--text-color);
}

.contact-item .icon {
    font-weight: bold;
    font-size: 1.3rem;
    width: 30px;
    text-align: center;
}

@media (max-width: 600px) {
    body {
        padding: 1rem;
    }

    h1 {
        font-size: 2rem;
        margin-bottom: 2rem;
    }

    .theme-toggle {
        top: 1rem;
        right: 1rem;
    }

    .contact-item {
        font-size: 1rem;
        padding: 0.875rem 1.5rem;
    }
}