/*
Theme Name: Meridian
Theme URI: https://example.com/meridian
Author: Claude
Author URI: https://claude.ai
Description: A clean, light, professional-blue blog theme with a distinctive rotated category "rail" that carries through cards, single posts and archives. Fast, minimal, widget-friendly.
Version: 1.0.0
Requires at least: 6.0
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: meridian
*/

/* =========================================================
   TOKENS
   ========================================================= */
:root {
	--bg: #FFFFFF;
	--bg-subtle: #F5F8FC;
	--surface: #FFFFFF;

	--ink: #131B2E;
	--ink-soft: #4A5568;
	--ink-faint: #8B96A8;

	--blue: #1857D6;
	--blue-deep: #0F3D9C;
	--blue-pale: #E8F0FE;

	--amber: #E8A33D;
	--amber-deep: #C6842399;

	--line: #E3E8F0;
	--line-strong: #C7D1E0;

	--footer-bg: #0F1626;
	--footer-ink: #C6CEDC;
	--footer-ink-soft: #7C879E;

	--font-display: 'Sora', 'Segoe UI', sans-serif;
	--font-body: 'Source Serif 4', Georgia, serif;
	--font-mono: 'IBM Plex Mono', ui-monospace, monospace;

	--radius: 6px;
	--container: 1180px;
	--rail-blue: var(--blue);
	--rail-amber: var(--amber);
	--rail-green: #1E9E6B;
	--rail-plum: #8B4CA8;

	--shadow-sm: 0 1px 2px rgba(19, 27, 46, 0.06);
	--shadow-md: 0 8px 24px rgba(19, 27, 46, 0.08);
}

/* =========================================================
   RESET
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
	html { scroll-behavior: auto; }
	*, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}
body {
	margin: 0;
	background: var(--bg);
	color: var(--ink);
	font-family: var(--font-body);
	font-size: 17px;
	line-height: 1.65;
	-webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); text-decoration: none; }
a:hover { color: var(--blue-deep); }
ul, ol { padding-left: 1.2em; }
figure { margin: 0; }
button { font-family: inherit; }

:focus-visible {
	outline: 2px solid var(--blue);
	outline-offset: 2px;
	border-radius: 2px;
}

/* =========================================================
   TYPE
   ========================================================= */
h1, h2, h3, h4, h5, h6 {
	font-family: var(--font-display);
	color: var(--ink);
	line-height: 1.15;
	font-weight: 700;
	margin: 0 0 0.5em;
	letter-spacing: -0.01em;
}
h1 { font-size: clamp(2rem, 1.5rem + 2vw, 3.1rem); }
h2 { font-size: clamp(1.5rem, 1.3rem + 1vw, 2.1rem); }
h3 { font-size: 1.4rem; }
p { margin: 0 0 1.2em; }

.eyebrow {
	font-family: var(--font-mono);
	text-transform: uppercase;
	letter-spacing: 0.12em;
	font-size: 0.72rem;
	color: var(--ink-faint);
}

/* =========================================================
   LAYOUT
   ========================================================= */
.wrap { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.site-content { padding: 48px 0 72px; }
.content-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 56px; }
.content-layout.no-sidebar { grid-template-columns: minmax(0, 1fr); max-width: 760px; margin: 0 auto; }
.screen-reader-text { position: absolute !important; clip: rect(1px,1px,1px,1px); width: 1px; height: 1px; overflow: hidden; }

/* =========================================================
   BUTTONS
   ========================================================= */
.btn {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	font-family: var(--font-display);
	font-weight: 600;
	font-size: 0.92rem;
	padding: 12px 22px;
	border-radius: var(--radius);
	border: 1px solid transparent;
	cursor: pointer;
	transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-deep); color: #fff; }
.btn-ghost { background: transparent; border-color: var(--line-strong); color: var(--ink); }
.btn-ghost:hover { border-color: var(--blue); color: var(--blue); }
.btn-amber { background: var(--amber); color: var(--ink); }
.btn-amber:hover { background: #d6922e; }

/* =========================================================
   HEADER / NAV
   ========================================================= */
.site-header {
	position: sticky;
	top: 0;
	z-index: 40;
	background: rgba(255,255,255,0.92);
	backdrop-filter: saturate(180%) blur(8px);
	border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 18px 0; }
.site-branding { display: flex; align-items: center; gap: 10px; }
.site-title { margin: 0; font-family: var(--font-display); font-size: 1.4rem; font-weight: 700; }
.site-title a { color: var(--ink); }
.site-title a:hover { color: var(--blue); }
.site-description { display: none; }
.custom-logo-link img { max-height: 42px; width: auto; }

.main-navigation { display: flex; align-items: center; gap: 28px; }
.main-navigation ul { list-style: none; display: flex; gap: 28px; margin: 0; padding: 0; }
.main-navigation li { position: relative; }
.main-navigation a {
	font-family: var(--font-display);
	font-weight: 600;
	font-size: 0.94rem;
	color: var(--ink-soft);
	padding: 6px 0;
	border-bottom: 2px solid transparent;
}
.main-navigation a:hover,
.main-navigation .current-menu-item > a { color: var(--ink); border-bottom-color: var(--blue); }

.header-actions { display: flex; align-items: center; gap: 14px; }
.header-search-toggle,
.menu-toggle {
	background: none;
	border: 1px solid var(--line-strong);
	border-radius: var(--radius);
	width: 40px;
	height: 40px;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	cursor: pointer;
	color: var(--ink);
}
.header-search-toggle:hover, .menu-toggle:hover { border-color: var(--blue); color: var(--blue); }
.menu-toggle { display: none; }

.header-search-panel {
	display: none;
	border-bottom: 1px solid var(--line);
	background: var(--bg-subtle);
}
.header-search-panel.is-open { display: block; }
.header-search-panel .wrap { padding: 16px 24px; }
.header-search-panel form { display: flex; gap: 10px; }
.header-search-panel input[type="search"] {
	flex: 1;
	padding: 10px 14px;
	border: 1px solid var(--line-strong);
	border-radius: var(--radius);
	font-family: var(--font-body);
	font-size: 1rem;
}

/* =========================================================
   SIGNATURE: CATEGORY RAIL
   A slim, colour-coded vertical tab that marks which section a
   post belongs to. Appears on cards, single posts, archives.
   ========================================================= */
.rail {
	--rail-color: var(--rail-blue);
	display: inline-flex;
	align-items: center;
	gap: 8px;
	padding-left: 14px;
	position: relative;
}
.rail::before {
	content: "";
	position: absolute;
	left: 0;
	top: 0;
	bottom: 0;
	width: 4px;
	border-radius: 2px;
	background: var(--rail-color);
}
.rail-label {
	font-family: var(--font-mono);
	text-transform: uppercase;
	letter-spacing: 0.1em;
	font-size: 0.72rem;
	color: var(--rail-color);
	font-weight: 600;
}

/* Card / post-header variant: full-height rail on the left edge */
.rail-block {
	--rail-color: var(--rail-blue);
	position: relative;
	padding-left: 18px;
}
.rail-block::before {
	content: "";
	position: absolute;
	left: 0;
	top: 4px;
	bottom: 4px;
	width: 5px;
	border-radius: 3px;
	background: var(--rail-color);
}

/* Category colour rotation, applied via nth-of-type on card grids */
.cat-color-0 { --rail-color: var(--rail-blue); }
.cat-color-1 { --rail-color: var(--rail-amber); }
.cat-color-2 { --rail-color: var(--rail-green); }
.cat-color-3 { --rail-color: var(--rail-plum); }

/* =========================================================
   LEAD / FEATURED POST
   ========================================================= */
.lead-post {
	display: grid;
	grid-template-columns: 1.1fr 1fr;
	gap: 40px;
	align-items: center;
	padding: 40px 0 48px;
	border-bottom: 1px solid var(--line);
	margin-bottom: 48px;
}
.lead-post-media { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-md); }
.lead-post-media img { aspect-ratio: 4/3; object-fit: cover; }
.lead-post-title { font-size: clamp(1.7rem, 1.3rem + 1.6vw, 2.6rem); margin: 10px 0 14px; }
.lead-post-title a { color: var(--ink); }
.lead-post-title a:hover { color: var(--blue); }
.lead-post-excerpt { color: var(--ink-soft); font-size: 1.06rem; }
.post-meta {
	font-family: var(--font-mono);
	font-size: 0.76rem;
	text-transform: uppercase;
	letter-spacing: 0.06em;
	color: var(--ink-faint);
	display: flex;
	flex-wrap: wrap;
	gap: 6px 14px;
	align-items: center;
	margin: 14px 0 0;
}
.post-meta a { color: var(--ink-faint); }
.post-meta a:hover { color: var(--blue); }

/* =========================================================
   CARD GRID
   ========================================================= */
.post-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.post-card {
	border: 1px solid var(--line);
	border-radius: var(--radius);
	overflow: hidden;
	background: var(--surface);
	transition: box-shadow 0.15s ease, transform 0.15s ease;
	display: flex;
	flex-direction: column;
}
.post-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.post-card-media { aspect-ratio: 16/10; overflow: hidden; }
.post-card-media img { width: 100%; height: 100%; object-fit: cover; }
.post-card-body { padding: 20px 22px 24px; flex: 1; display: flex; flex-direction: column; }
.post-card-title { font-size: 1.2rem; margin: 10px 0 8px; }
.post-card-title a { color: var(--ink); }
.post-card-title a:hover { color: var(--blue); }
.post-card-excerpt { color: var(--ink-soft); font-size: 0.95rem; flex: 1; }
.post-card .post-meta { margin-top: 12px; }

.section-heading {
	display: flex;
	align-items: baseline;
	justify-content: space-between;
	border-bottom: 2px solid var(--ink);
	padding-bottom: 10px;
	margin-bottom: 28px;
}
.section-heading h2 { margin: 0; font-size: 1.3rem; }
.section-heading a { font-family: var(--font-mono); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.08em; }

/* =========================================================
   SIDEBAR / WIDGETS
   ========================================================= */
.widget-area { display: flex; flex-direction: column; gap: 36px; }
.widget { border-top: 3px solid var(--ink); padding-top: 16px; }
.widget-title {
	font-family: var(--font-mono);
	text-transform: uppercase;
	letter-spacing: 0.08em;
	font-size: 0.82rem;
	margin: 0 0 14px;
	color: var(--ink);
}
.widget ul { list-style: none; margin: 0; padding: 0; }
.widget li { padding: 9px 0; border-bottom: 1px solid var(--line); font-size: 0.94rem; }
.widget li:last-child { border-bottom: none; }
.widget li a { color: var(--ink-soft); }
.widget li a:hover { color: var(--blue); }
.widget select, .widget input[type="text"], .widget input[type="search"] {
	width: 100%; padding: 9px 12px; border: 1px solid var(--line-strong); border-radius: var(--radius); font-family: var(--font-body);
}
.widget_search form { display: flex; gap: 8px; }
.widget_search input[type="submit"] {
	background: var(--blue); color: #fff; border: none; border-radius: var(--radius); padding: 0 16px; cursor: pointer;
}

.newsletter-box {
	background: var(--blue-pale);
	border-radius: var(--radius);
	padding: 24px;
}
.newsletter-box h3 { font-size: 1.05rem; margin-bottom: 8px; }
.newsletter-box p { font-size: 0.9rem; color: var(--ink-soft); margin-bottom: 16px; }

/* =========================================================
   SINGLE POST
   ========================================================= */
.single-post-header { padding: 44px 0 28px; max-width: 760px; margin: 0 auto; }
.single-post-title { margin-top: 14px; font-size: clamp(2rem, 1.6rem + 1.6vw, 2.8rem); }
.single-post-media { max-width: var(--container); margin: 0 auto 40px; border-radius: var(--radius); overflow: hidden; }
.single-post-media img { width: 100%; aspect-ratio: 21/9; object-fit: cover; }

.byline { display: flex; align-items: center; gap: 12px; margin-top: 20px; }
.byline img { border-radius: 50%; width: 40px; height: 40px; }
.byline-name { font-family: var(--font-display); font-weight: 600; font-size: 0.92rem; color: var(--ink); }
.byline-meta { font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-faint); }

.entry-content { font-size: 1.12rem; }
.entry-content > * + * { margin-top: 1.2em; }
.entry-content h2 { margin-top: 1.6em; }
.entry-content h3 { margin-top: 1.4em; }
.entry-content a { text-underline-offset: 3px; text-decoration: underline; text-decoration-color: var(--amber); }
.entry-content img, .entry-content figure { border-radius: var(--radius); }
.entry-content blockquote {
	margin: 1.8em 0;
	padding: 4px 0 4px 26px;
	position: relative;
	font-family: var(--font-body);
	font-style: italic;
	font-size: 1.3rem;
	color: var(--ink);
}
.entry-content blockquote::before {
	content: "";
	position: absolute;
	left: 0; top: 0; bottom: 0;
	width: 5px;
	border-radius: 3px;
	background: var(--blue);
}
.entry-content pre {
	background: var(--footer-bg);
	color: #E3E8F0;
	padding: 20px;
	border-radius: var(--radius);
	overflow-x: auto;
	font-family: var(--font-mono);
	font-size: 0.88rem;
}
.entry-content code { font-family: var(--font-mono); background: var(--bg-subtle); padding: 2px 6px; border-radius: 4px; font-size: 0.9em; }
.entry-content pre code { background: none; padding: 0; }

.entry-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 32px; }
.entry-tags a {
	font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em;
	border: 1px solid var(--line-strong); border-radius: 20px; padding: 6px 14px; color: var(--ink-soft);
}
.entry-tags a:hover { border-color: var(--blue); color: var(--blue); }

.author-box {
	display: flex; gap: 18px; margin-top: 48px; padding: 24px;
	background: var(--bg-subtle); border-radius: var(--radius);
}
.author-box img { border-radius: 50%; width: 56px; height: 56px; flex-shrink: 0; }
.author-box h3 { font-size: 1rem; margin-bottom: 4px; }
.author-box p { font-size: 0.92rem; color: var(--ink-soft); margin: 0; }

.post-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 40px; }
.post-nav a {
	display: block; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; color: var(--ink);
}
.post-nav a:hover { border-color: var(--blue); }
.post-nav .nav-dir { font-family: var(--font-mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-faint); display: block; margin-bottom: 6px; }
.post-nav .nav-next { text-align: right; grid-column: 2; }

/* =========================================================
   ARCHIVE / PAGE HEADER
   ========================================================= */
.archive-header, .page-header-block {
	padding: 40px 0 30px;
	margin-bottom: 36px;
	border-bottom: 1px solid var(--line);
}
.archive-header .rail-block, .page-header-block .rail-block { max-width: 760px; }
.archive-title { font-size: clamp(1.6rem, 1.3rem + 1.2vw, 2.3rem); margin: 6px 0 8px; }
.archive-description { color: var(--ink-soft); max-width: 620px; }

/* =========================================================
   PAGINATION
   ========================================================= */
.pagination { display: flex; gap: 8px; justify-content: center; margin-top: 48px; }
.pagination a, .pagination span {
	display: inline-flex; align-items: center; justify-content: center;
	min-width: 40px; height: 40px; padding: 0 10px;
	border: 1px solid var(--line-strong); border-radius: var(--radius);
	font-family: var(--font-mono); font-size: 0.86rem; color: var(--ink-soft);
}
.pagination a:hover { border-color: var(--blue); color: var(--blue); }
.pagination .current { background: var(--ink); border-color: var(--ink); color: #fff; }

/* =========================================================
   COMMENTS
   ========================================================= */
.comments-area { margin-top: 56px; max-width: 760px; }
.comments-title { border-top: 2px solid var(--ink); padding-top: 20px; font-size: 1.2rem; }
.comment-list { list-style: none; margin: 24px 0; padding: 0; }
.comment-list .children { list-style: none; padding-left: 32px; }
.comment-body { border-bottom: 1px solid var(--line); padding: 18px 0; }
.comment-author { display: flex; align-items: center; gap: 10px; }
.comment-author img { border-radius: 50%; }
.comment-author .fn { font-family: var(--font-display); font-weight: 600; font-style: normal; font-size: 0.94rem; }
.comment-metadata { font-family: var(--font-mono); font-size: 0.7rem; text-transform: uppercase; color: var(--ink-faint); margin-left: 46px; }
.comment-content { margin: 10px 0 0 46px; font-size: 0.98rem; }
.comment-reply-link { font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; margin-left: 46px; }

.comment-form input[type="text"], .comment-form input[type="email"], .comment-form input[type="url"], .comment-form textarea {
	width: 100%; padding: 11px 14px; border: 1px solid var(--line-strong); border-radius: var(--radius);
	font-family: var(--font-body); font-size: 1rem; margin-bottom: 16px;
}
.comment-form label { display: block; font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 6px; color: var(--ink-soft); }
.comment-form-comment { display: flex; flex-direction: column; }

/* =========================================================
   404
   ========================================================= */
.error-404 { text-align: center; padding: 80px 0; }
.error-404 .big-code { font-family: var(--font-mono); font-size: clamp(4rem, 3rem + 6vw, 8rem); color: var(--blue-pale); font-weight: 700; line-height: 1; margin-bottom: 8px; }
.error-404 h1 { margin-bottom: 12px; }
.error-404 p { color: var(--ink-soft); max-width: 480px; margin: 0 auto 28px; }
.error-404 form { max-width: 420px; margin: 0 auto 24px; display: flex; gap: 10px; }
.error-404 input[type="search"] { flex: 1; padding: 12px 16px; border: 1px solid var(--line-strong); border-radius: var(--radius); }

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer { background: var(--footer-bg); color: var(--footer-ink); margin-top: 80px; }
.footer-columns { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 40px; padding: 56px 0 36px; }
.footer-col h3 { font-family: var(--font-mono); text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.78rem; color: #fff; margin-bottom: 16px; }
.footer-col p { color: var(--footer-ink-soft); font-size: 0.92rem; }
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: var(--footer-ink); font-size: 0.92rem; }
.footer-col a:hover { color: var(--amber); }
.footer-brand { font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; color: #fff; margin-bottom: 10px; display: block; }
.footer-bottom {
	border-top: 1px solid rgba(255,255,255,0.1);
	padding: 20px 0;
	display: flex; justify-content: space-between; align-items: center;
	font-size: 0.82rem; color: var(--footer-ink-soft);
}
.footer-bottom a { color: var(--footer-ink-soft); }
.footer-bottom a:hover { color: var(--amber); }

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 900px) {
	.content-layout { grid-template-columns: 1fr; }
	.lead-post { grid-template-columns: 1fr; }
	.post-grid { grid-template-columns: 1fr; }
	.footer-columns { grid-template-columns: 1fr; gap: 28px; padding: 40px 0 24px; }
	.main-navigation { position: fixed; inset: 68px 0 0 0; background: var(--bg); flex-direction: column; align-items: flex-start; padding: 24px; transform: translateX(-100%); transition: transform 0.2s ease; overflow-y: auto; }
	.main-navigation.is-open { transform: translateX(0); }
	.main-navigation ul { flex-direction: column; gap: 4px; width: 100%; }
	.main-navigation a { display: block; padding: 12px 4px; }
	.menu-toggle { display: inline-flex; }
	.header-actions { order: 3; }
}
@media (max-width: 600px) {
	.byline-meta, .comment-metadata, .comment-content { margin-left: 0; }
	.comment-content { margin-top: 8px; }
	.post-nav { grid-template-columns: 1fr; }
	.post-nav .nav-next { text-align: left; grid-column: 1; }
	.footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
}