:root {
    --color-accent: #a3c4f3;

    --color-bg-surface: #fff;
    --color-bg-base: linear-gradient(135deg, #f5f5f5 0%, #eef2f3 50%, #e0eafc 100%);

    --glass-bg: rgba(255, 255, 255, 0.2);
    --glass-border: rgba(255, 255, 255, 0.3) 1px solid;

    --shadow-md: 0 6px 32px rgba(0, 0, 0, 0.08);

    --heading-line: linear-gradient(to right, var(--color-accent), transparent);
}

*{
    box-sizing: border-box;
}

body {
    background: var(--color-bg-base);
    background-attachment: fixed;
    color: #3f3f3f;
    display: flex;
    flex-direction: column;
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", Meiryo, sans-serif;
    margin: 0;
    min-height: 100vh;
    padding: 0;
}

footer {
    backdrop-filter: blur(12px);
    background: var(--glass-bg);
    border-top: var(--glass-border);
    box-shadow: var(--shadow-md);
    width: 100%;
}

footer p{
    font-size: 0.85rem;
    margin: 0 auto;
    padding: 0.25rem 0;
    text-align: center;
    width: 70vw;
}

header{
    backdrop-filter: blur(12px);
    background: var(--glass-bg);
    border-bottom: var(--glass-border);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
    padding: 1.25rem 0;
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 50;
}

main.home-main{
    display: flex;
    flex: 1;
    flex-direction: column;
    margin: 0 auto;
    width: 70vw;
}

main.page {
    background-color: var(--color-bg-surface);
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    flex: 1;
    margin: 1.5rem auto;
    padding: 1.5rem;
    width: 70vw;
}

main.page h1 {
    margin: 0;
}

p{
    line-height: 2.25;
}

.about {
    background-color: #fff;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
    padding: 1.5rem;
}

.about h2 {
    margin: 0;
    margin-top: 0.25rem;
    padding-bottom: 0.5rem;
    padding-left: 0.75rem;
    position: relative;
}

.about h2::after {
    content: "";
    background: var(--heading-line);
    position: absolute;
    bottom: 0;
    left: 0;
    height: 2px;
    width: 100%;
}

.about p {
    margin-top: 1rem;
    margin-bottom: 3rem;
    padding-inline: 0.75rem;
}

.home-links{
    display: grid;
    column-gap: 1rem;
    grid-auto-rows: min-content;
    grid-template-columns: 1fr 1fr 1fr;
    margin: 2rem auto;
    row-gap: 1rem;
    width: 100%;
}

.home-links .category{
    background-color: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    padding: 1.5rem;
}

.home-links .category h2{
    font-size: 1.25rem;
    margin: 0;
    padding-bottom: 0.3rem;
    padding-left: 0.5rem;
    position: relative;
    z-index: 0;
}

.home-links .category h2::after{
    content: "";
    background: linear-gradient(to right, var(--color-accent), transparent);
    bottom: 0;
    left: 0;
    height: 2px;
    position: absolute;
    width: 100%;
}

.home-links .category h2 a{
    color: #3f3f3f;
    text-decoration: none;
    transition: color 0.2s;
}

.home-links .category h2 a:hover{
    color: #3a8ee6;
}

.home-links .category h2 a:active{
    color: #2a6fb0;
}

.home-links .category ul{
    list-style-type: none;
    margin-bottom: 0;
    padding: 0;
    padding-left: 0.5rem;
}

.home-links .category ul li{
    margin: 0.5rem 0;
}

.home-links .category ul li.extra{
    display: none;
}

.home-links .category ul li.moreLinks{
    font-weight: bold;
}

.home-links .category ul li a{
    color: #3f3f3f;
    text-decoration: none;
    transition: color 0.2s;
}

.home-links .category ul li a:hover{
    color: #3a8ee6;
}

.home-links .category ul li a:active{
    color: #2a6fb0;
}

.site-title{
    font-family: 'Zen Old Mincho', serif;
    font-size: 1.5rem;
    line-height: normal;
    margin: 0 auto;
    width: 70vw;
}

.site-title a{
    color: #3f3f3f;
    text-decoration: none;
}

@media (max-width: 768px) {
    header{
        padding: 17.5px 20px;
    }

    main{
        padding: 8px;
        width: 100%;
    }

    main.home-main{
        width: 100%;
    }

    footer p{
        padding: 8px;
        width: 100%;
    }

    .home-links{
        grid-template-columns: 1fr;
        margin: 1rem auto;
    }

    .site-title{
        width: 100%;
    }    
}