:root {
    --main-color: #333;
    --bg-color: #f4f4f9;
}

* {
	box-sizing: border-box;
	word-break: auto-phrase;
}

html {
	scroll-behavior: smooth;
	font-size: 16px;
	overflow-x: hidden;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--main-color);
}

header {
    margin: 0;
    padding: 0.125rem 0;
    background-color: var(--main-color);
    color: var(--bg-color);
    text-align: center;
}

.grid_container {
    display: grid;
    justify-content: center;
    grid-template-columns: 1fr, 1fr;
    gap: 1rem;
    margin: 1rem;
}

section {
    border: 1px solid var(--main-color);
    border-radius: 0.5rem;
    text-align: center;
    padding: 0.5rem;
}
section:nth-of-type(odd) {
    grid-column: 1/2;
}
section:nth-of-type(even) {
    grid-column: 2/2;
}

section h2 {
    text-decoration: underline;
}

section a {
    display: inline-block;
    margin-top: 10px;
    padding: 10px 20px;
    background-color: var(--main-color);
    color: var(--bg-color);
    text-decoration: none;
    border-radius: 0.25rem;
}

section a:hover {
    background-color: color-mix(in srgb, var(--main-color), #fff 10%);
}

footer {
    background-color: var(--main-color);
    color: var(--bg-color);
    text-align: center;
    padding: 1rem;
}

/* 768px以下のスタイル */
@media (max-width: 768px) {
    html {
        font-size: 12px;
    }

    .grid_container {
        grid-template-columns: 1;
    }

    section:nth-of-type(odd), section:nth-of-type(even) {
        grid-column: 1/1;
    }
}