/* =========================================================
   Bunkei Log - main stylesheet
   設計トークン → ベース → レイアウト → コンポーネント → レスポンシブ
   配色は CSS 変数 + [data-theme] でライト/ダークを切替
   ========================================================= */

/* ---------- Design tokens (light) ---------- */
:root {
	--accent: #3b5bdb;
	--accent-hover: #2f49b0;
	--accent-soft: #e7ecff;
	--text: #1f2430;
	--text-muted: #5b6472;
	--bg: #ffffff;
	--surface: #f6f7f9;
	--surface-2: #eef0f4;
	--border: #e3e6ec;
	--code-bg: #0f1729;
	--code-text: #e6edf3;
	--shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 8px 24px rgba(16, 24, 40, .06);
	--radius: 14px;
	--radius-sm: 9px;
	--wrap: 1180px;
	--gap: clamp(1rem, .8rem + 1vw, 1.75rem);
	--header-h: 64px;
	--font-sans: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Yu Gothic", Meiryo, sans-serif;
	--font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

/* ---------- Design tokens (dark) ---------- */
[data-theme="dark"] {
	--accent: #8aa2ff;
	--accent-hover: #a8b9ff;
	--accent-soft: #1d2440;
	--text: #e6e8ee;
	--text-muted: #9aa3b2;
	--bg: #0e1117;
	--surface: #161b24;
	--surface-2: #1d2430;
	--border: #2a313d;
	--code-bg: #0a0e1a;
	--code-text: #e6edf3;
	--shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 30px rgba(0, 0, 0, .35);
	color-scheme: dark;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
	margin: 0;
	font-family: var(--font-sans);
	font-size: 1rem;
	line-height: 1.85;
	color: var(--text);
	background: var(--bg);
	-webkit-font-smoothing: antialiased;
	text-rendering: optimizeLegibility;
	transition: background-color .2s ease, color .2s ease;
}
img { max-width: 100%; height: auto; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }

h1, h2, h3, h4 { line-height: 1.4; font-weight: 700; }

.wrap { width: min(100% - 2rem, var(--wrap)); margin-inline: auto; }

.screen-reader-text {
	position: absolute !important; width: 1px; height: 1px;
	padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
	position: fixed; top: -100px; left: 1rem; z-index: 1000;
	background: var(--accent); color: #fff; padding: .6rem 1rem; border-radius: 8px;
}
.skip-link:focus { top: 1rem; }

/* ---------- Progress bar ---------- */
.site-progress {
	position: fixed; inset: 0 0 auto 0; height: 3px; z-index: 60; background: transparent; pointer-events: none;
}
.site-progress span {
	display: block; height: 100%; width: 0; background: var(--accent);
	transition: width .1s linear;
}

/* ---------- Header ---------- */
.site-header {
	position: sticky; top: 0; z-index: 50;
	background: color-mix(in srgb, var(--bg) 86%, transparent);
	backdrop-filter: saturate(180%) blur(10px);
	border-bottom: 1px solid var(--border);
	transition: box-shadow .2s ease;
}
.site-header[data-scrolled="true"] { box-shadow: var(--shadow); }
.site-header__inner {
	display: flex; align-items: center; gap: 1.25rem;
	height: var(--header-h);
}
.site-title { margin: 0; font-size: 1.1rem; font-weight: 800; letter-spacing: .01em; }
.site-title a { color: var(--text); }
.custom-logo { max-height: 40px; width: auto; }

.site-nav { margin-inline-start: auto; }
.site-nav__list {
	display: flex; gap: .25rem; list-style: none; margin: 0; padding: 0;
}
.site-nav__list a {
	display: inline-block; padding: .5rem .8rem; border-radius: 8px;
	color: var(--text-muted); font-size: .95rem; font-weight: 600;
}
.site-nav__list a:hover { color: var(--text); background: var(--surface); text-decoration: none; }

.site-header__actions { display: flex; align-items: center; gap: .5rem; }

.theme-toggle, .nav-toggle {
	display: inline-flex; align-items: center; justify-content: center;
	width: 40px; height: 40px; border: 1px solid var(--border); background: var(--surface);
	border-radius: 10px; cursor: pointer; color: var(--text);
}
.theme-toggle__icon { font-size: 1.05rem; line-height: 1; }
[data-theme="light"] .theme-toggle__icon--moon,
:root:not([data-theme="dark"]) .theme-toggle__icon--moon { display: none; }
[data-theme="dark"] .theme-toggle__icon--sun { display: none; }
.nav-toggle { display: none; flex-direction: column; gap: 4px; }
.nav-toggle span { width: 18px; height: 2px; background: currentColor; border-radius: 2px; transition: .2s; }

/* ---------- Layout ---------- */
.site-content { padding-block: clamp(1.5rem, 1rem + 2vw, 3rem); }
.content-area.layout-with-sidebar {
	display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: clamp(1.5rem, 1rem + 2vw, 3rem); align-items: start;
}
.content-area__main { min-width: 0; }
.content-area__main--narrow { max-width: 760px; margin-inline: auto; }

/* ---------- Page header ---------- */
.page-header { margin-bottom: var(--gap); }
.page-header__title { margin: 0; font-size: clamp(1.4rem, 1.1rem + 1.2vw, 2rem); }
.page-header__title span { color: var(--accent); }

/* ---------- Card grid ---------- */
.card-grid {
	display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: var(--gap);
}
.card {
	background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius);
	overflow: hidden; transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--accent) 35%, var(--border)); }
.card__link { display: flex; flex-direction: column; height: 100%; color: inherit; }
.card__link:hover { text-decoration: none; }
.card__thumb { aspect-ratio: 16 / 9; background: var(--surface); overflow: hidden; }
.card__image { width: 100%; height: 100%; object-fit: cover; display: block; }
.card__image--placeholder {
	display: grid; place-items: center; width: 100%; height: 100%;
	background: linear-gradient(135deg, var(--accent-soft), var(--surface));
}
.card__image--placeholder span { font-size: 2.4rem; font-weight: 800; color: var(--accent); opacity: .85; }
.card__body { padding: 1rem 1.1rem 1.2rem; display: flex; flex-direction: column; gap: .5rem; flex: 1; }
.card__title { margin: 0; font-size: 1.05rem; line-height: 1.5; }
.card__excerpt { margin: 0; font-size: .9rem; color: var(--text-muted); line-height: 1.7; }

/* ---------- Entry meta ---------- */
.entry-meta { display: flex; align-items: center; gap: .6rem; font-size: .8rem; color: var(--text-muted); }
.entry-meta__cat {
	background: var(--accent-soft); color: var(--accent); padding: .15rem .6rem; border-radius: 999px; font-weight: 700;
}
.entry-meta__cat:hover { text-decoration: none; }

/* ---------- Single ---------- */
.entry-header { margin-bottom: var(--gap); }
.entry-title { margin: .5rem 0 .6rem; font-size: clamp(1.5rem, 1.2rem + 1.8vw, 2.25rem); }
.entry-header__meta { display: flex; gap: 1rem; font-size: .85rem; color: var(--text-muted); }
.entry-eyecatch { margin: 0 0 var(--gap); border-radius: var(--radius); overflow: hidden; }
.entry-eyecatch img { width: 100%; display: block; }

.entry-content { font-size: 1.02rem; }
.entry-content > * + * { margin-top: 1.25em; }
.entry-content h2 {
	margin-top: 2.4em; padding-bottom: .4em; font-size: 1.5rem;
	border-bottom: 2px solid var(--border);
}
.entry-content h3 { margin-top: 1.8em; font-size: 1.2rem; }
.entry-content h2, .entry-content h3 { scroll-margin-top: calc(var(--header-h) + 16px); }
.entry-content a { text-decoration: underline; text-underline-offset: 2px; }
.entry-content ul, .entry-content ol { padding-left: 1.4em; }
.entry-content li + li { margin-top: .35em; }
.entry-content blockquote {
	margin: 1.5em 0; padding: .8em 1.2em; border-left: 4px solid var(--accent);
	background: var(--surface); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--text-muted);
}
.entry-content img { border-radius: var(--radius-sm); }
.entry-content table { width: 100%; border-collapse: collapse; }
.entry-content th, .entry-content td { border: 1px solid var(--border); padding: .6em .8em; }
.entry-content th { background: var(--surface); }

/* ---------- Code blocks ---------- */
.entry-content :not(pre) > code {
	font-family: var(--font-mono); font-size: .88em;
	background: var(--surface-2); padding: .15em .45em; border-radius: 6px;
	border: 1px solid var(--border);
}
.entry-content pre {
	position: relative; margin: 1.6em 0; padding: 1.1rem 1.1rem; overflow: auto;
	background: var(--code-bg); color: var(--code-text); border-radius: var(--radius-sm);
	font-family: var(--font-mono); font-size: .86rem; line-height: 1.7; tab-size: 2;
}
.entry-content pre code { font-family: inherit; background: none; border: 0; padding: 0; color: inherit; }
/* highlight.js: pre 側が背景を持つので code(.hljs) は透明にして二重背景を防ぐ */
.entry-content pre code.hljs { background: transparent; padding: 0; }
/* Highlighting Code Block の名残マークアップ（.hcb_wrap）も自前preに馴染ませる */
.entry-content .hcb_wrap { margin: 1.6em 0; }
.entry-content .hcb_wrap pre { margin: 0; }

/* ---------- Prism トークンのダーク配色（既存記事の焼き込みコードを上書き） ----------
   .entry-content 接頭辞で、自前CSS(custom-css-js)より詳細度を高くして確実に上書きする。 */
.entry-content pre[class*="language-"],
.entry-content .code-toolbar > pre[class*="language-"] {
	background: var(--code-bg) !important;
	color: #c9d3e0;
	text-shadow: none;
}
.entry-content .code-toolbar { position: relative; margin: 1.6em 0; }
.entry-content :not(pre) > code[class*="language-"] {
	background: var(--surface-2);
	color: var(--text);
	text-shadow: none;
	padding: .15em .45em;
	border-radius: 6px;
}
.entry-content pre[class*="language-"] .token { background: none !important; }
.entry-content .token.comment,
.entry-content .token.prolog,
.entry-content .token.doctype,
.entry-content .token.cdata { color: #6b7689; font-style: italic; }
.entry-content .token.punctuation { color: #abb2bf; }
.entry-content .token.property,
.entry-content .token.tag,
.entry-content .token.constant,
.entry-content .token.symbol,
.entry-content .token.deleted,
.entry-content .token.variable { color: #e06c75; }
.entry-content .token.boolean,
.entry-content .token.number { color: #d19a66; }
.entry-content .token.selector,
.entry-content .token.attr-name,
.entry-content .token.string,
.entry-content .token.char,
.entry-content .token.builtin,
.entry-content .token.inserted { color: #98c379; }
.entry-content .token.operator,
.entry-content .token.entity,
.entry-content .token.url { color: #56b6c2; }
.entry-content .token.atrule,
.entry-content .token.attr-value,
.entry-content .token.keyword { color: #c678dd; }
.entry-content .token.function,
.entry-content .token.class-name { color: #61afef; }
.entry-content .token.regex,
.entry-content .token.important { color: #e5c07b; }
.entry-content .token.important,
.entry-content .token.bold { font-weight: 700; }
.entry-content .token.italic { font-style: italic; }
.code-copy {
	position: absolute; top: .5rem; right: .5rem;
	font: 600 .72rem/1 var(--font-sans); color: #cdd5e0; background: rgba(255,255,255,.08);
	border: 1px solid rgba(255,255,255,.16); border-radius: 7px; padding: .4rem .6rem; cursor: pointer;
	opacity: 0; transition: opacity .15s ease, background .15s ease;
}
.entry-content pre:hover .code-copy, .code-copy:focus-visible { opacity: 1; }
.code-copy:hover { background: rgba(255,255,255,.16); }
.code-copy[data-copied="true"] { color: #7ee2a8; }

/* ---------- Callouts (block patterns) ---------- */
.callout {
	border: 1px solid var(--border); border-radius: var(--radius-sm);
	padding: 1rem 1.2rem; background: var(--surface);
}
.callout__label { font-weight: 800; font-size: .78rem; letter-spacing: .05em; margin: 0 0 .3rem; }
.callout--point { border-left: 4px solid var(--accent); }
.callout--point .callout__label { color: var(--accent); }
.callout--note { border-left: 4px solid #e8590c; }
.callout--note .callout__label { color: #e8590c; }
.cta {
	border: 1px solid var(--border); border-radius: var(--radius);
	padding: 1.4rem 1.5rem; background: var(--surface); text-align: center;
}

/* ---------- TOC ---------- */
.toc {
	border: 1px solid var(--border); border-radius: var(--radius);
	background: var(--bg); overflow: hidden;
}
.toc__toggle {
	display: flex; align-items: center; justify-content: space-between; width: 100%;
	padding: .85rem 1rem; background: var(--surface); border: 0; cursor: pointer; color: var(--text);
	font-weight: 700; font-size: .95rem;
}
.toc__chevron { width: 9px; height: 9px; border-right: 2px solid currentColor; border-bottom: 2px solid currentColor; transform: rotate(45deg); transition: transform .2s; }
.toc__toggle[aria-expanded="false"] .toc__chevron { transform: rotate(-45deg); }
.toc__list { list-style: none; margin: 0; padding: .7rem 1rem 1rem; counter-reset: toc; max-height: 70vh; overflow: auto; }
.toc__item { line-height: 1.5; }
.toc__item + .toc__item { margin-top: .35rem; }
.toc__item--h3 { padding-left: 1rem; font-size: .9rem; }
.toc__list a { color: var(--text-muted); display: block; padding: .15rem 0; border-left: 2px solid transparent; padding-left: .6rem; }
.toc__list a:hover { color: var(--text); text-decoration: none; }
.toc__list a.is-active { color: var(--accent); border-left-color: var(--accent); font-weight: 600; }

.entry-toc-mobile { display: none; margin-bottom: var(--gap); }

/* ---------- Breadcrumbs ---------- */
.breadcrumbs { margin-bottom: 1rem; }
.breadcrumbs__list { display: flex; flex-wrap: wrap; gap: .35rem; list-style: none; margin: 0; padding: 0; font-size: .82rem; color: var(--text-muted); }
.breadcrumbs__item + .breadcrumbs__item::before { content: "›"; margin-right: .35rem; color: var(--text-muted); }

/* ---------- Sidebar ---------- */
.sidebar { display: flex; flex-direction: column; gap: var(--gap); }
.sidebar__sticky { position: sticky; top: calc(var(--header-h) + 16px); display: flex; flex-direction: column; gap: var(--gap); }
.widget { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.1rem 1.2rem; }
.widget__title { margin: 0 0 .8rem; font-size: .95rem; }

.profile-card { text-align: center; }
.profile-card__avatar { width: 88px; height: 88px; border-radius: 50%; object-fit: cover; margin-inline: auto; }
.profile-card__avatar--placeholder { display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); font-size: 2rem; font-weight: 800; }
.profile-card__name { margin: .7rem 0 .3rem; font-size: 1.05rem; }
.profile-card__bio { margin: 0; font-size: .85rem; color: var(--text-muted); }

/* ---------- Search form ---------- */
.search-form { display: flex; gap: .4rem; }
.search-form__field {
	flex: 1; min-width: 0; padding: .6rem .8rem; border: 1px solid var(--border);
	border-radius: 10px; background: var(--bg); color: var(--text); font: inherit; font-size: .9rem;
}
.search-form__submit {
	display: inline-grid; place-items: center; width: 42px; border: 1px solid var(--border);
	background: var(--accent); color: #fff; border-radius: 10px; cursor: pointer;
}

/* ---------- Pagination ---------- */
.pagination { margin-top: 2rem; }
.pagination .nav-links { display: flex; flex-wrap: wrap; gap: .4rem; justify-content: center; }
.pagination .page-numbers {
	display: inline-grid; place-items: center; min-width: 40px; height: 40px; padding: 0 .6rem;
	border: 1px solid var(--border); border-radius: 10px; color: var(--text); background: var(--bg); font-weight: 600;
}
.pagination .page-numbers.current { background: var(--accent); color: #fff; border-color: var(--accent); }
.pagination a.page-numbers:hover { border-color: var(--accent); text-decoration: none; }

/* ---------- Buttons / misc ---------- */
.button, .wp-block-button__link {
	display: inline-block; background: var(--accent); color: #fff; padding: .7rem 1.4rem;
	border-radius: 10px; font-weight: 700;
}
.button:hover, .wp-block-button__link:hover { background: var(--accent-hover); text-decoration: none; }
.entry-tags { display: flex; flex-wrap: wrap; gap: .4rem; list-style: none; padding: 0; margin: 1.5rem 0 0; }
.entry-tags a { font-size: .8rem; background: var(--surface); border: 1px solid var(--border); padding: .25rem .7rem; border-radius: 999px; color: var(--text-muted); }
.entry-footer { margin-top: var(--gap); }

/* ---------- Share buttons ---------- */
.share { margin-top: var(--gap); }
.share__label { display: block; font-size: .8rem; color: var(--text-muted); margin-bottom: .5rem; font-weight: 700; }
.share__list { display: flex; flex-wrap: wrap; gap: .5rem; list-style: none; margin: 0; padding: 0; }
.share__btn {
	display: inline-flex; align-items: center; justify-content: center; gap: .3rem;
	min-width: 44px; height: 44px; padding: 0 .9rem; border: 1px solid var(--border);
	border-radius: 10px; background: var(--bg); color: var(--text); font-weight: 700; font-size: .85rem;
	cursor: pointer; transition: transform .12s ease, filter .12s ease, background .12s ease;
}
.share__btn:hover { transform: translateY(-2px); text-decoration: none; }
.share__btn--x { background: #000; color: #fff; border-color: #000; }
.share__btn--hatena { background: #00a4de; color: #fff; border-color: #00a4de; }
.share__btn--facebook { background: #1877f2; color: #fff; border-color: #1877f2; }
.share__btn--line { background: #06c755; color: #fff; border-color: #06c755; }
.share__btn--copy[data-copied="true"] { background: var(--accent-soft); color: var(--accent); border-color: var(--accent); }
.share__txt { line-height: 1; }
.share__copied { font-size: .75rem; }

/* ---------- Post navigation (prev/next) ---------- */
.post-nav { margin-top: clamp(2rem, 1.5rem + 2vw, 3rem); }
.post-nav .nav-links { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.post-nav .nav-previous a, .post-nav .nav-next a {
	display: flex; flex-direction: column; gap: .3rem; height: 100%;
	padding: 1rem 1.2rem; border: 1px solid var(--border); border-radius: var(--radius);
	background: var(--bg); color: var(--text); transition: border-color .15s ease, transform .15s ease;
}
.post-nav .nav-previous a:hover, .post-nav .nav-next a:hover { border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }
.post-nav .nav-next { text-align: right; }
.post-nav__label { font-size: .78rem; color: var(--text-muted); font-weight: 700; }
.post-nav__title { font-size: .95rem; line-height: 1.5; color: var(--text); }
@media (max-width: 600px) { .post-nav .nav-links { grid-template-columns: 1fr; } .post-nav .nav-next { text-align: left; } }

/* ---------- Comments ---------- */
.comments-area { margin-top: clamp(2rem, 1.5rem + 2vw, 3.5rem); }
.comments-area .comments-title, .comments-area .comment-reply-title { font-size: 1.3rem; margin: 0 0 var(--gap); padding-left: .6rem; border-left: 4px solid var(--accent); }
.comment-list { list-style: none; margin: 0; padding: 0; }
.comment-list .comment { margin-bottom: 1.2rem; }
.comment-list .comment-body { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.2rem; }
.comment-list .children { list-style: none; margin: 1rem 0 0; padding-left: clamp(.8rem, 3vw, 2rem); }
.comment-author { display: flex; align-items: center; gap: .6rem; }
.comment-author .avatar { border-radius: 50%; }
.comment-author .fn { font-weight: 700; font-style: normal; }
.comment-metadata { font-size: .78rem; color: var(--text-muted); }
.comment-metadata a { color: var(--text-muted); }
.comment-content { margin-top: .6rem; }
.comment-content a { word-break: break-all; }
.comment-respond { margin-top: var(--gap); background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.2rem 1.4rem; }
.comment-form label { display: block; font-size: .85rem; font-weight: 700; margin-bottom: .3rem; }
.comment-form input[type="text"],
.comment-form input[type="email"],
.comment-form input[type="url"],
.comment-form textarea {
	width: 100%; padding: .6rem .8rem; border: 1px solid var(--border); border-radius: 10px;
	background: var(--bg); color: var(--text); font: inherit; font-size: .95rem; margin-bottom: 1rem;
}
.comment-form .form-submit input, .comment-list .reply a {
	display: inline-block; background: var(--accent); color: #fff; border: 0;
	padding: .6rem 1.4rem; border-radius: 10px; font-weight: 700; cursor: pointer;
}
.comment-list .reply a:hover { background: var(--accent-hover); text-decoration: none; }

/* ---------- Related posts ---------- */
.related { margin-top: clamp(2rem, 1.5rem + 2vw, 3.5rem); }
.related__title { margin: 0 0 var(--gap); font-size: 1.3rem; padding-left: .6rem; border-left: 4px solid var(--accent); }
.card-grid--related { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.no-results { color: var(--text-muted); }

/* ---------- Footer ---------- */
.site-footer { margin-top: clamp(2.5rem, 2rem + 3vw, 5rem); border-top: 1px solid var(--border); background: var(--surface); }
.site-footer__inner { display: flex; flex-direction: column; align-items: center; gap: .8rem; padding-block: 2rem; text-align: center; }
.site-footer__list { display: flex; flex-wrap: wrap; gap: 1rem; list-style: none; margin: 0; padding: 0; }
.site-footer__list a { color: var(--text-muted); font-size: .9rem; }
.site-footer__copy { margin: 0; color: var(--text-muted); font-size: .82rem; }

.to-top {
	position: fixed; right: 1rem; bottom: 1rem; width: 44px; height: 44px; border-radius: 50%;
	border: 1px solid var(--border); background: var(--bg); color: var(--text); cursor: pointer;
	box-shadow: var(--shadow); opacity: 0; pointer-events: none; transition: opacity .2s ease; z-index: 40;
}
.to-top[data-visible="true"] { opacity: 1; pointer-events: auto; }

/* ---------- Lightbox（画像拡大） ---------- */
.entry-content a.has-lightbox { cursor: zoom-in; }
.lightbox {
	position: fixed; inset: 0; z-index: 200; display: none; place-items: center;
	background: rgba(0, 0, 0, .85); padding: 2rem; cursor: zoom-out;
}
.lightbox.is-open { display: grid; }
.lightbox__img { max-width: 95vw; max-height: 90vh; border-radius: 8px; box-shadow: 0 10px 40px rgba(0, 0, 0, .5); }
.lightbox__close {
	position: absolute; top: 1rem; right: 1rem; width: 44px; height: 44px;
	border: 0; border-radius: 50%; background: rgba(255, 255, 255, .15); color: #fff;
	font-size: 1.6rem; line-height: 1; cursor: pointer;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
	.content-area.layout-with-sidebar { grid-template-columns: 1fr; }
	.sidebar { order: 2; }
	.sidebar__sticky { position: static; }
	.sidebar .toc { display: none; } /* PCサイドバーのTOCはモバイルで隠す */
	.entry-toc-mobile { display: block; }
}

@media (max-width: 720px) {
	.site-nav { display: none; }
	.nav-toggle { display: inline-flex; }
	.site-nav.is-open {
		display: block; position: fixed; inset: var(--header-h) 0 auto 0; margin: 0;
		background: var(--bg); border-bottom: 1px solid var(--border); box-shadow: var(--shadow);
	}
	.site-nav.is-open .site-nav__list { flex-direction: column; padding: .5rem; }
	.site-nav.is-open .site-nav__list a { display: block; }
}