:root {
    --bg: #edeaec;
    --surface: rgba(255, 255, 255, 0.5);
    --line: #990099;
    --line-soft: #f3e7ff;
    --text: #9b47a0;
    --text-dim: #222;
    --text-faint: #9b47a0;
    --accent: #9b47a0;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: "M PLUS 1", sans-serif;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

#particles-js {
    z-index: -1;
    width: 100vw;
    height: 100vh;
    position: fixed;
}

.serif {
    font-family: 'Orbitron', sans-serif;
}

a {
    color: inherit;
}


a>img{
    padding: 2px;
    border: 1px solid;
}


ul,ol {
    margin-left: 2rem;
}
/* ---------- HERO ---------- */
.hero {
    max-width: 1120px;
    margin: 0 auto;
    padding: 64px 28px 40px;
    border-bottom: 1px solid var(--line);
    display: flex;
    align-items: flex-end;
    gap: 28px;
    flex-wrap: wrap;
}

.avatar {
    width: 88px;
    height: 88px;
    border-radius: 50%;
    background: linear-gradient(155deg, #2c2c30, #131315);
    border: 1px solid var(--line);
    flex-shrink: 0;
}

.hero-text {
    flex: 1;
}

@font-face {
    font-family: 'Kaisotai-Next-UP-B';
    src: url(/material/Kaisotai-Next-UP-B.woff2);
}

.kaisoutai {
    font-family: 'Kaisotai-Next-UP-B', serif;
}

.handle {
    font-size: 2rem;
    font-weight: 900;
    letter-spacing: 0.01em;
}

.bio {
    max-width: 52ch;
    color: var(--text-dim);
    font-size: 1rem;
    margin-bottom: 1rem;
}

@media (max-width:860px) {
    .bio {
        margin-bottom: 0.125rem;
    }
}

/* ---------- LAYOUT: index + main ---------- */
.layout {
    max-width: 1120px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 0;
    align-items: start;
}

/* index nav — desktop left rail */
nav.index {
    position: sticky;
    top: 0;
    align-self: start;
    padding: 40px 20px 40px 28px;
    border-right: 1px solid var(--line);
    height: 100vh;
    overflow-y: auto;
}

nav.index ol {
    list-style: none;
}

nav.index li+li {
    margin-top: 2px;
}

nav.index a {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 9px 10px;
    border-radius: 3px;
    color: var(--text-faint);
    font-size: 1.25rem;
    transition: color .15s ease, background-color .15s ease;
}

nav.index a:hover {
    color: var(--text-dim);
}

nav.index a.active {
    color: var(--text);
    background: var(--surface);
}

nav.index a.active .num {
    color: var(--accent);
}

/* mobile chip nav */
nav.index-mobile {
    display: none;
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(6px);
    border-bottom: 1px solid var(--line);
    overflow-x: auto;
    white-space: nowrap;
    padding: 14px 16px;
}

nav.index-mobile a {
    display: inline-flex;
    align-items: baseline;
    gap: 6px;
    padding: 6px 12px;
    margin-right: 6px;
    border: 1px solid var(--line);
    border-radius: 999px;
    font-size: 12.5px;
    color: var(--text-dim);
    background-color: var(--line-soft);
    text-decoration: none;
    border-color: var(--text);
}

nav.index-mobile a.active {
    border-color: var(--accent);
    color: var(--text);
}

/* ---------- MAIN / SECTIONS ---------- */
main {
    padding: 8px 28px 120px 40px;
}

section.topic {
    padding: 56px 0 8px;
    border-bottom: 1px solid var(--line-soft);
    scroll-margin-top: 24px;
}

section.topic:last-child {
    border-bottom: none;
}

.topic-head {
    display: flex;
    align-items: baseline;
    gap: 16px;
    margin-bottom: 6px;
}

.topic-head h2 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 0.01em;
}

.tagline {
    font-family: 'M PLUS 1', serif;
    color: var(--text-dim);
    font-size: 1rem;
    margin: 0.725rem 0 1rem 0;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
    gap: 14px;
}

.card {
    color: var(--text-dim);
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 3px;
    padding: 18px;
}

.card h3 {
    color: var(--text);
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.card p {
    font-size: 1rem;
    line-height: 1.7;
}
.card dt,.card dd {
    color: var(--text-dim);
}

.card dl{
    margin:0 0.625rem;
}
.card dt {
    font-size:0.75rem;
}
.card dd {
    font-size:1rem;
    margin-left:2rem;
}

.card .tag {
    display: inline-block;
    margin-top: 12px;
    font-size: 11px;
    color: var(--text-faint);
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: 3px 9px;
}

.card.wide {
    grid-column: span 2;
}

@media (max-width:520px) {
    .card.wide {
        grid-column: span 1;
    }
}

.card img{
    max-width: 100%;
}

footer {
    text-align: center;
    padding: 60px 20px 80px;
    color: var(--text-faint);
    font-size: 12px;
}

/* ---------- responsive ---------- */
@media (max-width:860px) {
    .layout {
        grid-template-columns: 1fr;
    }

    nav.index {
        display: none;
    }

    nav.index-mobile {
        display: block;
    }

    main {
        padding: 8px 20px 100px;
    }

    .hero {
        padding: 44px 20px 32px;
    }
}

.sp {
    display: block;
}

.sp.inline_block {
    display: inline-block;
}

@media (min-width:480px) {
    .pc {
        display: block;
    }

    .pc.inline {
        display: inline;
    }

    .pc.table-cell {
        display: table-cell;
    }

    /* スマホ用の要素を目隠し */
    .sp,
    .sp.inline_block {
        display: none;
    }
}

.elm_displaynone,
.elm_chkstatus,
.elm_dispnone {
    display: none;
    font-size: 0;
}

.elm_block {
    display: block;
}

.elm_inlineblock {
    display: inline-block;
}

/* displa:noneにするとTab＋Spaceで選択できないため透明に */
.elm_chkstatus {
    filter: alpha(opacity=0);
    -moz-opacity: 0;
    opacity: 0;
    -webkit-appearance: none;
    appearance: none;
    position: absolute;
}

.scroll::-webkit-scrollbar {
    height: 5px;
}

.scroll::-webkit-scrollbar-track {
    border-radius: 10px;
}

.scroll::-webkit-scrollbar-thumb {
    border-radius: 10px;
}
.scroll::-webkit-scrollbar-thumb {
    background-color: #990099;
}