:root {
    --background: #ffffff;
    --text: #111111;
    --subtext: #666666;
    --button: #111111;
    --button-text: #ffffff;
}

body {
    margin: 0;
    font-family: sans-serif;
    background-color: var(--background);
    color: var(--text);
}

.home {
    min-height: 100vh;
    position: relative;

    display: flex;
    justify-content: center;
    align-items: center;
}

.hero {
    width: min(90%, 420px);
    padding: 24px;
    text-align: center;
}

h1 {
    margin: 0 0 32px;
    font-size: 48px;
}

.catchcopy {
    margin: 0;
    font-size: 24px;
    line-height: 1.6;
}

.description {
    margin-top: 24px;
    font-size: 15px;
    line-height: 1.8;
    color: var(--subtext);
}

.site-footer {
    position: absolute;
    bottom: 24px;
    left: 0;
    width: 100%;
    text-align: center;
}

.site-footer p {
    margin: 0;
    font-size: 12px;
    color: #888888;
}

.brand-icon {
    width: 18px;
    height: 18px;
    object-fit: contain;
}

.brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;

    font-size: 12px;
    color: #888;
}

.start-button {
    display: inline-block;

    margin-top: 40px;
    padding: 14px 36px;

    font-size: 16px;
    text-decoration: none;

    background-color: #111111;
    color: #ffffff;
    border-radius: 12px;
}

.level-list {
    display: grid;
    gap: 12px;
}

.howto-link {
    position: absolute;
    top: 24px;
    right: 24px;

    font-size: 14px;
    color: #666666;
    text-decoration: none;
}

.howto-link:hover {
    color: #111111;
}

.about-omoi {
    width: min(100% - 48px, 680px);
    box-sizing: border-box;
    margin: 0 auto;
    padding: 72px 0 96px;
    border-top: 1px solid #eeeeee;
}

.about-omoi h2 {
    margin: 0 0 24px;
    font-size: 28px;
    line-height: 1.5;
}

.about-omoi p {
    margin: 0;
    font-size: 15px;
    line-height: 2;
    color: var(--subtext);
}

.about-omoi p + p {
    margin-top: 20px;
    color: var(--text);
    font-weight: 600;
}