/*
Theme Name: Learn Artificial Intelligence
Theme URI: https://learnaitoday.local/
Author: AI + Linux
Description: Clean editorial block theme for the Learn Artificial Intelligence blog — the companion site to the AI + Linux YouTube channel. White background, Roboto Slab slab-serif headings, sans-serif body, a single coral accent, and a card-based magazine layout.
Requires at least: 6.7
Tested up to: 7.0
Requires PHP: 7.4
Version: 0.11.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: plain-ai
Tags: blog, block-theme, custom-colors, custom-menu, editor-style, full-site-editing, news, one-column, two-columns
*/

/* ============================================================
   Tokens mirror theme.json so plain CSS classes can use them.
   ============================================================ */
:root{
	--paper:#FEFEFE; --card:#FFFFFF; --ink:#0A0A0A; --ink-soft:#4A4A4A;
	--muted:#9B9B9B; --line:#E9E9E9; --accent:#F75454;
	--display:"Roboto Slab",Georgia,serif;
	--body:"Helvetica Neue",Helvetica,Arial,system-ui,sans-serif;
	--mono:"JetBrains Mono",ui-monospace,monospace;
}

/* ---------- header / brand ---------- */
.site-header{border-bottom:1px solid var(--line);background:var(--paper)}
.header-bar{max-width:1100px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:22px 24px;gap:20px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink)}
.brand-logo{height:38px;width:auto;display:block}
.nav-links{display:flex;gap:26px;font-family:var(--body);font-size:15px;font-weight:600}
.nav-links a{color:var(--ink);text-decoration:none;letter-spacing:.01em}
.nav-links a:hover{color:var(--accent)}

/* ---------- eyebrow / category label ---------- */
.eyebrow,.tag,.tag a,
.post-grid .wp-block-post-terms,
.featured-query .wp-block-post-terms{
	font-family:var(--body);font-size:12px;font-weight:700;letter-spacing:.08em;
	text-transform:uppercase;color:var(--accent);text-decoration:none;
}
.tag a:hover,.post-grid .wp-block-post-terms a:hover{color:var(--ink)}

/* ---------- lede / hero ---------- */
.hero-title{max-width:16ch}
.lede{font-size:21px;color:var(--ink-soft);max-width:58ch}

/* ---------- meta (byline / date) ---------- */
.meta,.meta a,.post-grid .wp-block-post-date,.post-grid .wp-block-post-author-name{
	font-family:var(--body);font-size:13px;color:var(--muted);text-decoration:none;
}
.meta a:hover{color:var(--accent)}
.meta{display:flex;gap:8px;align-items:center;flex-wrap:wrap}

/* ---------- lead media (companion video or cover image) ---------- */
.lead-media{margin:0;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--card)}
.lead-media--video iframe{display:block;width:100%;aspect-ratio:16/9;border:0}
.lead-media--image img{display:block;width:100%;height:auto}

/* featured "read" link */
.read-link a{
	font-family:var(--body);font-weight:700;font-size:15px;color:var(--accent);text-decoration:none;
	letter-spacing:.02em;
}
.read-link a:hover{color:var(--ink)}

/* ---------- section heading w/ hairline rule ---------- */
.sec-head{display:flex;align-items:center;gap:16px;margin:0 0 28px}
.sec-head h2,.sec-head .wp-block-heading{
	font-family:var(--display);font-weight:700;font-size:24px;line-height:1;margin:0;white-space:nowrap;
}
.sec-head::after{content:"";flex:1;height:1px;background:var(--line)}

/* ---------- post grid cards ---------- */
.post-grid .wp-block-post{
	background:var(--card);display:flex;flex-direction:column;gap:10px;height:100%;
}
.post-grid .wp-block-post-featured-image{margin:0 0 4px}
.post-grid .wp-block-post-featured-image img{
	width:100%;aspect-ratio:1.9/1;object-fit:cover;border-radius:6px;display:block;
}
.post-grid .wp-block-post-title{font-family:var(--display);font-weight:700;font-size:20px;line-height:1.25;margin:0}
.post-grid .wp-block-post-title a{color:var(--ink);text-decoration:none}
.post-grid .wp-block-post-title a:hover{color:var(--accent)}
.post-grid .wp-block-post-excerpt{font-size:15px;color:var(--ink-soft);margin:0;flex:1;line-height:1.55}

/* ---------- featured (top of homepage) ---------- */
.featured-query .wp-block-post-title{font-family:var(--display);font-weight:900;font-size:clamp(28px,4vw,40px);line-height:1.1;margin:6px 0 12px}
.featured-query .wp-block-post-title a{color:var(--ink);text-decoration:none}
.featured-query .wp-block-post-title a:hover{color:var(--accent)}
.featured-query .wp-block-post-excerpt{font-size:18px;color:var(--ink-soft);line-height:1.6}

/* ---------- email capture ---------- */
.signup{
	border:1px solid var(--line);border-radius:8px;background:#fafafa;
	color:var(--ink);padding:42px;text-align:center;
}
.signup h2,.signup .wp-block-heading{font-family:var(--display);font-weight:700;font-size:30px;line-height:1.15;margin:0 0 10px;color:var(--ink)}
.signup p{max-width:48ch;margin:0 auto 22px;font-size:17px;color:var(--ink-soft)}
.signup form{display:flex;gap:10px;max-width:480px;margin:0 auto;flex-wrap:wrap;justify-content:center}
.signup input[type=email]{
	flex:1;min-width:220px;font-family:var(--body);font-size:16px;padding:13px 16px;
	border:1px solid var(--line);border-radius:6px;background:#fff;color:var(--ink);
}
.signup input[type=email]:focus{outline:none;border-color:var(--accent)}
.signup button{
	font-family:var(--body);font-weight:700;font-size:16px;padding:13px 26px;border:0;
	border-radius:6px;background:var(--accent);color:#fff;cursor:pointer;transition:opacity .12s;
}
.signup button:hover{opacity:.88}
.signup small{display:block;margin-top:14px;color:var(--muted);font-family:var(--body);font-size:12px}

/* ---------- ad slot ---------- */
.ad-slot{
	margin:0 auto;max-width:728px;min-height:90px;border:1px dashed var(--line);
	border-radius:6px;display:grid;place-items:center;color:var(--muted);
	font-family:var(--mono);font-size:12px;background:#fafafa;text-align:center;
}

/* ---------- tool callout ---------- */
.tool-cta{
	border:1px solid var(--line);border-radius:6px;background:var(--card);
	padding:24px 26px;display:flex;gap:18px;align-items:center;flex-wrap:wrap;
}
.tool-cta .badge{
	font-family:var(--display);font-weight:700;font-size:30px;color:var(--accent);flex:0 0 auto;
	width:56px;height:56px;display:grid;place-items:center;
}
.tool-cta .t{flex:1;min-width:220px}
.tool-cta h3{font-family:var(--display);font-weight:700;font-size:21px;margin:0 0 4px}
.tool-cta p{font-size:16px;color:var(--ink-soft);margin:0}
.tool-cta a.btn{
	font-family:var(--body);font-weight:700;font-size:15px;text-decoration:none;background:var(--accent);
	color:#fff;border-radius:6px;padding:11px 20px;white-space:nowrap;transition:opacity .12s;
}
.tool-cta a.btn:hover{opacity:.88}

/* ---------- post body ---------- */
.entry-content{font-size:19px;line-height:1.7;color:var(--ink)}
.entry-content p{margin:0 0 22px}
.entry-content .lead{font-size:21px;color:var(--ink-soft)}
.entry-content h2{margin-top:40px}
.entry-content h3{margin-top:30px}
.entry-content a{color:var(--accent);text-decoration:underline;text-underline-offset:2px}
.entry-content ul,.entry-content ol{margin:0 0 22px 24px}
.entry-content li{margin-bottom:8px}
.entry-content blockquote{
	border:1px solid var(--line);border-radius:8px;margin:0 0 22px;padding:18px 22px;
	color:var(--ink-soft);font-style:italic;
}
.entry-content pre,
.entry-content .wp-block-code{
	background:#0A0A0A;color:#F4F4F4;font-family:var(--mono);font-size:15px;
	line-height:1.6;padding:18px 20px;border-radius:6px;overflow-x:auto;
}

/* ---------- related ---------- */
.related{border-top:1px solid var(--line);padding-top:28px}
.related h2,.related .wp-block-heading{font-family:var(--display);font-weight:700;font-size:24px;margin:0 0 16px}
.related a{display:block;font-family:var(--body);font-weight:600;font-size:17px;text-decoration:none;color:var(--ink);margin-bottom:10px}
.related a:hover{color:var(--accent)}

/* ---------- author box ("Who wrote this") ---------- */
.author-box{
	align-items:flex-start;gap:20px;
	border:1px solid var(--line);border-radius:8px;
	padding:24px 26px;background:#fff;
}
.author-box__avatar{flex:0 0 auto}
.author-box__avatar img,.author-box .wp-block-avatar img{
	width:88px;height:88px;border-radius:50%;display:block;object-fit:cover;
}
.author-box__body{flex:1 1 auto;min-width:0}
.author-box__eyebrow{
	font-family:var(--body);text-transform:uppercase;letter-spacing:.08em;
	font-size:12px;font-weight:700;color:var(--muted);margin:0 0 4px;
}
.author-box__name,.author-box__name a{
	font-family:var(--display);font-weight:700;font-size:20px;
	color:var(--ink);text-decoration:none;margin:0 0 8px;display:inline-block;
}
.author-box__name a:hover{color:var(--accent)}
.author-box__bio{
	font-family:var(--body);font-size:15.5px;line-height:1.65;color:var(--muted);margin:0;
}
@media(max-width:540px){
	.author-box{flex-direction:column}
	.author-box__avatar img,.author-box .wp-block-avatar img{width:72px;height:72px}
}

/* ---------- inline "See also" cards ---------- */
.see-also{
	border:1px solid var(--line);border-radius:8px;background:var(--card);
	padding:16px 18px;margin:28px 0;
}
.see-also__label{
	display:block;font-family:var(--body);text-transform:uppercase;letter-spacing:.08em;
	font-size:11px;font-weight:700;color:var(--muted);margin-bottom:6px;
}
.see-also a{text-decoration:none;color:var(--ink);display:block}
.see-also a:hover .see-also__title{color:var(--accent)}
.see-also__cat{
	display:block;font-family:var(--body);font-size:12px;font-weight:700;
	color:var(--accent);text-transform:uppercase;letter-spacing:.04em;margin-bottom:2px;
}
.see-also__title{font-family:var(--display);font-weight:700;font-size:18px;line-height:1.3}

/* ---------- trust / transparency line ---------- */
.article-trust{
	border-top:1px solid var(--line);padding-top:18px;margin-top:8px;
}
.article-trust p{font-family:var(--body);font-size:14px;line-height:1.6;color:var(--muted);margin:0}
.article-trust a{color:var(--accent);text-decoration:none;font-weight:600;white-space:nowrap}
.article-trust a:hover{text-decoration:underline}

/* ---------- sticky share bar (in the TOC rail) ---------- */
.share-bar{
	margin-top:24px;display:flex;flex-wrap:wrap;align-items:center;gap:8px;
}
.share-bar__label{
	width:100%;font-family:var(--body);text-transform:uppercase;letter-spacing:.08em;
	font-size:11px;font-weight:700;color:var(--muted);
}
.share-btn{
	width:34px;height:34px;display:grid;place-items:center;cursor:pointer;
	border:1px solid var(--line);border-radius:50%;background:#fff;color:var(--ink);
	padding:0;transition:color .15s,border-color .15s;
}
.share-btn svg{width:16px;height:16px;fill:currentColor}
.share-btn:hover{color:var(--accent);border-color:var(--accent)}
.share-copy.copied{color:#fff;background:var(--accent);border-color:var(--accent)}
@media(max-width:960px){
	/* in one-column layout the rail sits above the article; keep share inline */
	.share-bar{margin:8px 0 24px}
}

/* ---------- pagination ---------- */
.wp-block-query-pagination a,.wp-block-query-pagination .current{font-family:var(--body);font-weight:600;color:var(--ink);text-decoration:none}
.wp-block-query-pagination a:hover{color:var(--accent)}
.wp-block-query-pagination .current{color:var(--accent)}

/* ---------- footer / disclosure ---------- */
.site-footer{border-top:1px solid var(--line);background:var(--paper)}
.footer-bar{max-width:1100px;margin:0 auto;display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;align-items:center;padding:34px 24px 60px}
.disclosure{
	font-family:var(--body);font-size:13px;color:var(--muted);max-width:560px;line-height:1.6;margin:0;
}
.footer-links a{color:var(--ink);text-decoration:none;font-family:var(--body);font-weight:600;font-size:14px;margin-left:20px}
.footer-links a:hover{color:var(--accent)}

/* ============================================================
   Article readability scaffolding (TOC rail, takeaways, callout,
   breadcrumbs) — Google Cloud-style.
   ============================================================ */

/* ---------- breadcrumbs ---------- */
.breadcrumbs{font-family:var(--body);font-size:13px;color:var(--muted);margin-bottom:20px}
.breadcrumbs a,.breadcrumbs .rank-math-breadcrumb a{color:var(--muted);text-decoration:none}
.breadcrumbs a:hover,.breadcrumbs .rank-math-breadcrumb a:hover{color:var(--accent)}
.breadcrumbs .separator,.breadcrumbs .rank-math-breadcrumb .separator{margin:0 8px;color:var(--line)}
.breadcrumbs .rank-math-breadcrumb p{margin:0}
.breadcrumbs .last,.breadcrumbs .rank-math-breadcrumb .last{color:var(--ink-soft)}

/* ---------- two-column article row ---------- */
.article-row{align-items:flex-start}
.article-main{min-width:0}

/* ---------- sticky "On this page" TOC rail ---------- */
.toc-rail{position:sticky;top:24px;align-self:flex-start}
.plain-ai-toc{border-left:2px solid var(--line);padding:2px 0 2px 18px}
.plain-ai-toc .toc-title{
	font-family:var(--body);font-size:12px;font-weight:700;letter-spacing:.08em;
	text-transform:uppercase;color:var(--muted);margin:0 0 12px;line-height:1.3;
}
.plain-ai-toc ul{list-style:none;margin:0;padding:0}
.plain-ai-toc li{margin:0 0 9px;line-height:1.35}
.plain-ai-toc li.toc-sub{margin-left:14px}
.plain-ai-toc a{font-family:var(--body);font-size:14px;color:var(--ink-soft);text-decoration:none}
.plain-ai-toc a:hover{color:var(--accent)}

/* anchored sections shouldn't hide under the top edge when jumped to */
.entry-content h2,.entry-content h3{scroll-margin-top:24px}

/* ============================================================
   Magazine homepage (lead story, news river, sidebar modules).
   ============================================================ */
.lead-row{align-items:flex-start}

/* lead story */
.lead-story .featured-query .wp-block-post-featured-image{margin:0 0 16px}
.lead-story .featured-query .wp-block-post-featured-image img{
	width:100%;aspect-ratio:1.7/1;object-fit:cover;border-radius:8px;display:block;background:#f0f0f0;
}
.lead-story .featured-query .wp-block-post-title{
	font-family:var(--display);font-weight:900;font-size:clamp(28px,4vw,40px);line-height:1.1;margin:8px 0 12px;
}
.lead-story .featured-query .wp-block-post-title a{color:var(--ink);text-decoration:none}
.lead-story .featured-query .wp-block-post-title a:hover{color:var(--accent)}
.lead-story .featured-query .wp-block-post-excerpt{font-size:18px;color:var(--ink-soft);line-height:1.6}

/* shared module title */
.module-title{
	font-family:var(--body);font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
	color:var(--ink);margin:0 0 14px;padding-bottom:10px;border-bottom:2px solid var(--ink);
}

/* Latest news river */
.lead-rail{position:sticky;top:24px}
.news-river{margin-bottom:36px}
.river-query .wp-block-post{padding:14px 0;border-bottom:1px solid var(--line)}
.river-query .wp-block-post:first-child{padding-top:0}
.river-query .wp-block-post-title{font-family:var(--display);font-weight:700;font-size:16px;line-height:1.3;margin:4px 0}
.river-query .wp-block-post-title a{color:var(--ink);text-decoration:none}
.river-query .wp-block-post-title a:hover{color:var(--accent)}

/* Events module */
.events-module .module-title{margin-bottom:14px}
.events-list{list-style:none;margin:0;padding:0}
.events-list li{padding:12px 0;border-bottom:1px solid var(--line);display:flex;flex-direction:column;gap:3px}
.events-list .event-host{font-family:var(--body);font-size:11px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--accent)}
.events-list a{font-family:var(--display);font-weight:700;font-size:16px;color:var(--ink);text-decoration:none}
.events-list a:hover{color:var(--accent)}
.events-list .event-note{font-family:var(--body);font-size:13px;color:var(--ink-soft);line-height:1.45}
.events-foot{font-family:var(--body);font-size:12px;color:var(--muted);margin:14px 0 0;font-style:italic}

/* section heading links */
.sec-head h2 a{color:var(--ink);text-decoration:none}
.sec-head h2 a:hover{color:var(--accent)}

/* ---------- "More from the blog" list under the hero ---------- */
.more-blog{margin-top:32px;border-top:1px solid var(--line);padding-top:8px}
.more-blog .module-title{margin-top:14px}

/* ---------- Most viewed module (right rail) ---------- */
.lead-rail .most-viewed{margin-top:36px}
.most-viewed .module-title{margin-bottom:14px}
.mv-card{display:flex;gap:14px;align-items:flex-start;padding:16px 0;border-bottom:1px solid var(--line)}
.mv-card:first-of-type{padding-top:0}
.mv-card .mv-rank{font-family:var(--display);font-weight:900;font-size:30px;line-height:1;color:var(--line)}
.mv-card .mv-body{display:flex;flex-direction:column;gap:6px}
.mv-card h3{font-family:var(--display);font-weight:700;font-size:18px;line-height:1.25;margin:0}
.mv-card h3 a{color:var(--ink);text-decoration:none}
.mv-card h3 a:hover{color:var(--accent)}

/* ---------- source note (AI News rewritten from sources) ---------- */
.source-note{font-family:var(--body);font-size:13px;color:var(--muted);border-top:1px solid var(--line);margin-top:28px;padding-top:14px}
.source-note a{color:var(--ink-soft)}
.source-note a:hover{color:var(--accent)}

@media(max-width:781px){
	.lead-rail{position:static;margin-top:36px}
}

/* ---------- key takeaways box ---------- */
.key-takeaways{
	border:1px solid var(--line);border-radius:6px;
	background:#fafafa;padding:24px 28px;
}
.key-takeaways .kt-title{
	font-family:var(--display);font-weight:700;font-size:18px;margin:0 0 12px;
	color:var(--ink);text-transform:none;letter-spacing:0;
}
.key-takeaways ul{margin:0 0 0 20px}
.key-takeaways li{font-size:16px;line-height:1.55;color:var(--ink);margin-bottom:8px}
.key-takeaways li:last-child{margin-bottom:0}

/* ---------- callout / definition box ---------- */
.callout{
	border:1px solid var(--line);border-radius:6px;
	background:var(--card);padding:20px 24px;margin:28px 0;
}
.callout .callout-label{
	font-family:var(--body);font-size:12px;font-weight:700;letter-spacing:.08em;
	text-transform:uppercase;color:var(--accent);margin:0 0 6px;
}
.callout .callout-body{font-size:17px;line-height:1.6;color:var(--ink);margin:0}

/* ---------- responsive: collapse TOC rail above content ---------- */
@media(max-width:960px){
	.article-row{display:block}
	.toc-rail{position:static;width:100%!important;flex-basis:auto!important;margin-bottom:32px}
	.plain-ai-toc{border-left:0;border:1px solid var(--line);border-radius:6px;padding:18px 20px}
}

@media(max-width:600px){
	.nav-links{gap:16px;font-size:14px}
	.signup{padding:30px 22px}
	.key-takeaways{padding:20px 22px}
}

/* ============================================================
   Launch-readiness additions (v0.11.0): accessibility,
   archive/search/404 templates, and the comments thread.
   ============================================================ */

/* ---------- accessibility: skip link + focus rings ---------- */
.skip-link{
	position:absolute;left:-9999px;top:0;z-index:1000;
	background:var(--ink);color:#fff;padding:10px 16px;border-radius:0 0 6px 0;
	font-family:var(--body);font-weight:700;font-size:14px;text-decoration:none;
}
.skip-link:focus{left:0}
/* visible keyboard focus on interactive elements (mouse clicks stay clean) */
a:focus-visible,button:focus-visible,input:focus-visible,
.share-btn:focus-visible,.nav-links a:focus-visible,.footer-links a:focus-visible{
	outline:2px solid var(--accent);outline-offset:2px;border-radius:3px;
}
/* offset for in-page #signup jump so the header doesn't cover it */
.anchor-offset{position:relative;top:-90px}

/* ---------- archive / search heads ---------- */
.archive-head .wp-block-query-title{
	font-family:var(--display);font-weight:800;font-size:clamp(26px,4vw,38px);line-height:1.1;margin:0;
}
.archive-head .archive-desc{font-family:var(--body);font-size:17px;color:var(--ink-soft);margin:12px 0 0;max-width:60ch}
.search-form{max-width:440px;margin-top:18px}
.search-form .wp-block-search__input{
	font-family:var(--body);font-size:16px;border:1px solid var(--line);border-radius:6px 0 0 6px;
}
.search-form .wp-block-search__button{
	background:var(--accent);color:#fff;border:0;font-family:var(--body);font-weight:700;border-radius:0 6px 6px 0;
}

/* ---------- 404 ---------- */
.error-404 h1{font-family:var(--display);font-weight:800;font-size:clamp(30px,5vw,44px);margin:0 0 14px}
.error-404 p{font-family:var(--body);font-size:18px;color:var(--ink-soft);line-height:1.6}
.error-404__links a{color:var(--accent);text-decoration:none;font-weight:600}
.error-404__links a:hover{text-decoration:underline}

/* ---------- comments ---------- */
.article-comments{border-top:1px solid var(--line);padding-top:36px}
.article-comments .wp-block-comments-title{font-family:var(--display);font-weight:700;font-size:24px;margin:0 0 24px}
.comment-item{border:1px solid var(--line);border-radius:8px;padding:18px 20px;margin-bottom:16px}
.comment-meta{align-items:center;gap:10px;margin-bottom:10px}
.comment-meta img{width:40px;height:40px;border-radius:50%}
.comment-meta .wp-block-comment-author-name,
.comment-meta .wp-block-comment-author-name a{font-family:var(--body);font-weight:700;color:var(--ink);text-decoration:none}
.comment-meta .wp-block-comment-date,
.comment-meta .wp-block-comment-date a{font-family:var(--body);color:var(--muted);text-decoration:none}
.article-comments .wp-block-comment-content{font-family:var(--body);font-size:16px;line-height:1.65;color:var(--ink)}
.article-comments .wp-block-post-comments-form{margin-top:28px}
.article-comments input[type=text],
.article-comments input[type=email],
.article-comments input[type=url],
.article-comments textarea{
	font-family:var(--body);font-size:16px;width:100%;padding:12px 14px;
	border:1px solid var(--line);border-radius:6px;background:#fff;margin-top:6px;
}
.article-comments .wp-block-button__link,
.article-comments .form-submit input[type=submit]{
	background:var(--accent);color:#fff;border:0;border-radius:6px;
	font-family:var(--body);font-weight:700;font-size:16px;padding:12px 24px;cursor:pointer;
}