/*
Theme Name: ToanCap1
Theme URI: https://toancap1.com/
Author: Toancap1.com
Author URI: https://toancap1.com/
Description: Theme WordPress thuần cho website Toán cấp 1, phù hợp nội dung Toán tiểu học lớp 1 đến lớp 5.
Version: 1.0.0
Requires at least: 5.9
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: toancap1
Tags: education, blog, two-columns, custom-logo, custom-menu, featured-images
*/

:root {
	--color-ink: #132033;
	--color-muted: #5c6678;
	--color-border: #d9e4f2;
	--color-surface: #ffffff;
	--color-soft: #f4f9ff;
	--color-primary: #1f5f9f;
	--color-primary-dark: #174977;
	--color-green: #168a62;
	--color-orange: #d36a21;
	--color-red: #d94444;
	--color-purple: #7657c7;
	--color-yellow: #ffcf4a;
	--shadow-soft: 0 18px 45px rgba(31, 95, 159, 0.12);
	--radius: 8px;
	--font-main: Arial, "Helvetica Neue", Helvetica, sans-serif;
}

*,
*::before,
*::after {
	box-sizing: border-box;
}

html {
	font-size: 16px;
	scroll-behavior: smooth;
}

body {
	margin: 0;
	background:
		linear-gradient(rgba(31, 95, 159, 0.045) 1px, transparent 1px),
		linear-gradient(90deg, rgba(31, 95, 159, 0.045) 1px, transparent 1px),
		#f8fbff;
	background-size: 28px 28px;
	color: var(--color-ink);
	font-family: var(--font-main);
	font-size: 1rem;
	line-height: 1.65;
	letter-spacing: 0;
}

a {
	color: var(--color-primary);
	text-decoration: none;
}

a:hover,
a:focus {
	color: var(--color-primary-dark);
	text-decoration: underline;
}

img {
	display: block;
	height: auto;
	max-width: 100%;
}

button,
input,
select,
textarea {
	font: inherit;
}

button {
	cursor: pointer;
}

.container {
	margin: 0 auto;
	max-width: 1120px;
	width: min(1120px, calc(100% - 32px));
}

.narrow-container {
	max-width: 780px;
}

.screen-reader-text {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
	border: 0;
}

.screen-reader-text:focus {
	top: 12px;
	left: 12px;
	z-index: 100000;
	display: block;
	width: auto;
	height: auto;
	padding: 10px 14px;
	background: var(--color-ink);
	color: #fff;
	clip: auto;
	border-radius: var(--radius);
}

.site {
	min-height: 100vh;
	overflow-x: hidden;
}

.top-strip {
	background: var(--color-ink);
	color: #fff;
	font-size: 0.92rem;
}

.top-strip-inner {
	display: flex;
	justify-content: space-between;
	gap: 16px;
	padding: 7px 0;
}

.top-strip a {
	color: #fff;
	font-weight: 700;
}

.site-header {
	background: var(--color-surface);
	border-bottom: 1px solid var(--color-border);
	box-shadow: 0 8px 22px rgba(19, 32, 51, 0.06);
}

.brand-row {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 28px;
	padding: 22px 0;
}

.site-branding {
	display: flex;
	align-items: center;
	min-width: 0;
	gap: 16px;
}

.site-logo,
.custom-logo-link {
	display: inline-flex;
	flex: 0 0 auto;
	align-items: center;
	justify-content: center;
}

.site-logo img,
.custom-logo {
	width: 210px;
	max-height: 90px;
	object-fit: contain;
}

.site-title-wrap {
	min-width: 0;
}

.site-title {
	margin: 0;
	font-size: 2rem;
	font-weight: 800;
	line-height: 1.08;
}

.site-title a {
	color: var(--color-ink);
	text-decoration: none;
}

.site-description {
	margin: 6px 0 0;
	color: var(--color-muted);
	font-weight: 700;
}

.header-search {
	flex: 0 1 360px;
}

.search-form {
	display: flex;
	align-items: stretch;
	width: 100%;
	gap: 8px;
}

.search-form label {
	flex: 1;
	min-width: 0;
}

.search-field {
	width: 100%;
	min-height: 42px;
	padding: 9px 12px;
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
	background: #fff;
	color: var(--color-ink);
	outline: none;
}

.search-field:focus {
	border-color: var(--color-primary);
	box-shadow: 0 0 0 3px rgba(31, 95, 159, 0.16);
}

.search-submit,
.button,
.wp-block-button__link {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	min-height: 42px;
	padding: 10px 16px;
	border: 1px solid transparent;
	border-radius: var(--radius);
	background: var(--color-primary);
	color: #fff;
	font-weight: 800;
	line-height: 1.2;
	text-align: center;
	text-decoration: none;
	white-space: normal;
}

.search-submit:hover,
.search-submit:focus,
.button:hover,
.button:focus,
.wp-block-button__link:hover,
.wp-block-button__link:focus {
	background: var(--color-primary-dark);
	color: #fff;
	text-decoration: none;
}

.button-light {
	background: #fff;
	border-color: var(--color-border);
	color: var(--color-primary);
}

.button-light:hover,
.button-light:focus {
	background: #eef6ff;
	color: var(--color-primary-dark);
}

.main-navigation {
	background: var(--color-primary);
	color: #fff;
}

.nav-container {
	position: relative;
	display: flex;
	align-items: center;
}

.nav-toggle {
	display: none;
	align-items: center;
	gap: 10px;
	min-height: 48px;
	padding: 8px 12px;
	border: 0;
	border-radius: var(--radius);
	background: transparent;
	color: #fff;
	font-weight: 800;
}

.nav-toggle-lines,
.nav-toggle-lines::before,
.nav-toggle-lines::after {
	display: block;
	width: 22px;
	height: 2px;
	background: currentColor;
	content: "";
}

.nav-toggle-lines {
	position: relative;
}

.nav-toggle-lines::before,
.nav-toggle-lines::after {
	position: absolute;
	left: 0;
}

.nav-toggle-lines::before {
	top: -7px;
}

.nav-toggle-lines::after {
	top: 7px;
}

.nav-menu {
	display: flex;
	align-items: center;
	flex-wrap: wrap;
	gap: 0;
	width: 100%;
	margin: 0;
	padding: 0;
	list-style: none;
}

.nav-menu li {
	position: relative;
	margin: 0;
}

.nav-menu > li > a {
	display: flex;
	align-items: center;
	min-height: 52px;
	padding: 12px 16px;
	color: #fff;
	font-weight: 800;
	text-decoration: none;
}

.nav-menu > li > a:hover,
.nav-menu > li > a:focus,
.nav-menu > li.current-menu-item > a {
	background: rgba(255, 255, 255, 0.16);
	color: #fff;
}

.menu-item-has-children > a::after {
	margin-left: 8px;
	content: "▾";
	font-size: 0.72em;
}

.sub-menu {
	position: absolute;
	top: 100%;
	left: 0;
	z-index: 20;
	display: none;
	width: 230px;
	margin: 0;
	padding: 8px;
	list-style: none;
	background: #fff;
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
	box-shadow: var(--shadow-soft);
}

.nav-menu li:hover > .sub-menu,
.nav-menu li:focus-within > .sub-menu {
	display: block;
}

.sub-menu a {
	display: block;
	padding: 9px 10px;
	border-radius: 6px;
	color: var(--color-ink);
	font-weight: 700;
	text-decoration: none;
}

.sub-menu a:hover,
.sub-menu a:focus {
	background: var(--color-soft);
	color: var(--color-primary);
}

.home-hero {
	position: relative;
	padding: 54px 0 46px;
	background:
		linear-gradient(135deg, rgba(31, 95, 159, 0.12), rgba(22, 138, 98, 0.08)),
		linear-gradient(0deg, #ffffff 0%, #eef8ff 100%);
	border-bottom: 1px solid var(--color-border);
}

.hero-grid {
	display: grid;
	grid-template-columns: minmax(0, 1fr) minmax(320px, 420px);
	align-items: center;
	gap: 42px;
}

.eyebrow {
	margin: 0 0 9px;
	color: var(--color-primary);
	font-size: 0.88rem;
	font-weight: 900;
	text-transform: uppercase;
}

.hero-copy h1 {
	margin: 0;
	max-width: 760px;
	font-size: 2.9rem;
	line-height: 1.12;
}

.hero-copy p:not(.eyebrow) {
	max-width: 660px;
	margin: 16px 0 0;
	color: var(--color-muted);
	font-size: 1.08rem;
}

.hero-actions {
	display: flex;
	flex-wrap: wrap;
	gap: 12px;
	margin-top: 24px;
}

.hero-visual {
	justify-self: end;
	width: min(100%, 420px);
}

.math-board {
	position: relative;
	min-height: 300px;
	padding: 26px;
	background:
		linear-gradient(rgba(255, 255, 255, 0.88), rgba(255, 255, 255, 0.88)),
		repeating-linear-gradient(0deg, transparent 0 31px, rgba(31, 95, 159, 0.12) 31px 32px),
		repeating-linear-gradient(90deg, transparent 0 31px, rgba(31, 95, 159, 0.12) 31px 32px);
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
	box-shadow: var(--shadow-soft);
}

.board-label {
	display: inline-flex;
	padding: 5px 10px;
	border-radius: 6px;
	background: var(--color-yellow);
	color: var(--color-ink);
	font-size: 0.9rem;
	font-weight: 900;
}

.equation-row {
	display: flex;
	align-items: center;
	flex-wrap: wrap;
	gap: 10px;
	margin-top: 26px;
	font-size: 2rem;
	font-weight: 900;
}

.equation-row span {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	min-width: 58px;
	min-height: 58px;
	border-radius: var(--radius);
	background: #fff;
	border: 2px solid var(--color-primary);
}

.equation-row b {
	color: var(--color-red);
}

.shape-row {
	display: flex;
	align-items: center;
	gap: 12px;
	margin-top: 28px;
	font-weight: 900;
}

.shape {
	display: inline-block;
	width: 34px;
	height: 34px;
}

.shape-square {
	background: var(--color-green);
}

.shape-circle {
	background: var(--color-orange);
	border-radius: 50%;
}

.shape-triangle {
	width: 0;
	height: 0;
	border-right: 20px solid transparent;
	border-bottom: 36px solid var(--color-purple);
	border-left: 20px solid transparent;
}

.fraction-card {
	position: absolute;
	right: 26px;
	bottom: 24px;
	display: grid;
	place-items: center;
	width: 72px;
	height: 92px;
	background: #fff;
	border: 2px solid var(--color-orange);
	border-radius: var(--radius);
	color: var(--color-orange);
	font-size: 1.35rem;
	font-weight: 900;
}

.fraction-card i {
	display: block;
	width: 42px;
	height: 2px;
	background: currentColor;
}

.section-block {
	padding: 46px 0;
}

.section-heading {
	max-width: 720px;
	margin-bottom: 22px;
}

.section-heading h2,
.page-title,
.entry-title,
.not-found-panel h1 {
	margin: 0;
	color: var(--color-ink);
	line-height: 1.2;
	overflow-wrap: anywhere;
}

.section-heading h2 {
	font-size: 1.9rem;
}

.with-link {
	display: flex;
	align-items: flex-end;
	justify-content: space-between;
	max-width: none;
	gap: 18px;
}

.text-link,
.read-more-link,
.card-link {
	display: inline-flex;
	align-items: center;
	font-weight: 900;
}

.grade-grid {
	display: grid;
	grid-template-columns: repeat(5, minmax(0, 1fr));
	gap: 14px;
}

.grade-card,
.topic-card,
.post-card,
.post-list-item,
.content-panel,
.single-article,
.widget,
.not-found-panel,
.no-results {
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
	background: var(--color-surface);
}

.grade-card {
	overflow: hidden;
	box-shadow: 0 12px 28px rgba(19, 32, 51, 0.08);
}

.grade-card a,
.topic-card a {
	display: block;
	height: 100%;
	padding: 18px;
	color: var(--color-ink);
	text-decoration: none;
}

.grade-card:hover,
.grade-card:focus-within,
.topic-card:hover,
.topic-card:focus-within,
.post-card:hover,
.post-list-item:hover {
	transform: translateY(-2px);
	box-shadow: var(--shadow-soft);
}

.grade-icon,
.topic-icon {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 42px;
	height: 42px;
	margin-bottom: 12px;
	border-radius: var(--radius);
	background: var(--color-primary);
	color: #fff;
	font-weight: 900;
}

.grade-card h2,
.grade-card h3,
.topic-card h3,
.post-card h3 {
	margin: 0;
	font-size: 1.08rem;
	line-height: 1.25;
}

.grade-card p,
.topic-card p,
.card-excerpt {
	margin: 10px 0 0;
	color: var(--color-muted);
	font-size: 0.95rem;
}

.card-link {
	margin-top: 14px;
}

.grade-tone-blue .grade-icon,
.grade-tone-blue .topic-icon {
	background: var(--color-primary);
}

.grade-tone-green .grade-icon,
.grade-tone-green .topic-icon {
	background: var(--color-green);
}

.grade-tone-orange .grade-icon,
.grade-tone-orange .topic-icon {
	background: var(--color-orange);
}

.grade-tone-red .grade-icon,
.grade-tone-red .topic-icon {
	background: var(--color-red);
}

.grade-tone-purple .grade-icon,
.grade-tone-purple .topic-icon {
	background: var(--color-purple);
}

.latest-section {
	background: #fff;
	border-top: 1px solid var(--color-border);
	border-bottom: 1px solid var(--color-border);
}

.post-card-grid {
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	gap: 18px;
}

.post-card {
	overflow: hidden;
	transition: box-shadow 160ms ease, transform 160ms ease;
}

.post-card-thumb {
	display: block;
	aspect-ratio: 16 / 10;
	overflow: hidden;
	background: var(--color-soft);
}

.post-card-thumb img {
	width: 100%;
	height: 100%;
	object-fit: cover;
}

.post-card-body {
	padding: 16px;
}

.entry-pills {
	display: flex;
	flex-wrap: wrap;
	gap: 7px;
	margin-bottom: 10px;
}

.entry-pill {
	display: inline-flex;
	align-items: center;
	min-height: 28px;
	padding: 4px 9px;
	border-radius: 6px;
	background: #eaf4ff;
	color: var(--color-primary);
	font-size: 0.82rem;
	font-weight: 900;
	text-decoration: none;
}

.entry-pill:hover,
.entry-pill:focus {
	background: var(--color-primary);
	color: #fff;
	text-decoration: none;
}

.fallback-thumbnail {
	display: grid;
	place-items: center;
	width: 100%;
	height: 100%;
	min-height: 160px;
	background:
		linear-gradient(135deg, rgba(255, 207, 74, 0.24), rgba(66, 201, 139, 0.18)),
		#eef8ff;
	color: var(--color-primary);
}

.fallback-thumbnail span {
	font-size: 3rem;
	font-weight: 900;
	line-height: 1;
}

.fallback-thumbnail small {
	color: var(--color-muted);
	font-weight: 900;
}

.topic-layout {
	display: grid;
	grid-template-columns: 0.8fr 1.2fr;
	gap: 24px;
	align-items: start;
}

.topic-grid {
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	gap: 14px;
}

.topic-card {
	min-height: 100%;
	transition: box-shadow 160ms ease, transform 160ms ease;
}

.page-section {
	padding: 34px 0 48px;
}

.content-sidebar-layout {
	display: grid;
	grid-template-columns: minmax(0, 1fr) 320px;
	gap: 26px;
	align-items: start;
}

.content-panel,
.single-article,
.not-found-panel,
.no-results {
	padding: 24px;
}

.page-header {
	margin-bottom: 22px;
}

.page-header p:not(.eyebrow),
.archive-description {
	max-width: 760px;
	margin: 10px 0 0;
	color: var(--color-muted);
}

.breadcrumbs {
	display: flex;
	flex-wrap: wrap;
	gap: 8px;
	margin-bottom: 14px;
	color: var(--color-muted);
	font-size: 0.9rem;
}

.breadcrumbs a {
	font-weight: 800;
}

.post-list {
	display: grid;
	gap: 16px;
}

.post-list-item {
	display: grid;
	grid-template-columns: 220px minmax(0, 1fr);
	gap: 18px;
	overflow: hidden;
	transition: box-shadow 160ms ease, transform 160ms ease;
}

.post-list-thumb {
	display: block;
	min-height: 172px;
	background: var(--color-soft);
}

.post-list-thumb img,
.post-list-thumb .fallback-thumbnail {
	width: 100%;
	height: 100%;
	object-fit: cover;
}

.post-list-content {
	padding: 17px 18px 17px 0;
}

.post-list-content .entry-title,
.post-card .entry-title {
	margin: 0;
	font-size: 1.2rem;
}

.post-list-content .entry-title a,
.post-card .entry-title a {
	color: var(--color-ink);
	text-decoration: none;
}

.post-list-content .entry-title a:hover,
.post-card .entry-title a:hover {
	color: var(--color-primary);
	text-decoration: none;
}

.entry-meta {
	display: flex;
	flex-wrap: wrap;
	gap: 8px 12px;
	margin-top: 9px;
	color: var(--color-muted);
	font-size: 0.88rem;
}

.entry-meta .updated {
	display: none;
}

.entry-summary {
	margin-top: 10px;
	color: var(--color-muted);
}

.entry-summary p {
	margin: 0;
}

.read-more-link {
	margin-top: 12px;
}

.navigation.pagination {
	margin-top: 24px;
}

.nav-links {
	display: flex;
	flex-wrap: wrap;
	gap: 8px;
}

.page-numbers {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	min-width: 40px;
	min-height: 40px;
	padding: 7px 11px;
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
	background: #fff;
	color: var(--color-primary);
	font-weight: 900;
	text-decoration: none;
}

.page-numbers.current,
.page-numbers:hover,
.page-numbers:focus {
	background: var(--color-primary);
	color: #fff;
	text-decoration: none;
}

.widget-area {
	display: grid;
	gap: 16px;
}

.widget {
	padding: 18px;
}

.widget-title,
.footer-widget-title {
	margin: 0 0 12px;
	font-size: 1.05rem;
	line-height: 1.25;
}

.widget ul,
.footer-widget ul {
	margin: 0;
	padding: 0;
	list-style: none;
}

.grade-mini-list {
	display: grid;
	gap: 8px;
}

.grade-mini-item a {
	display: flex;
	align-items: center;
	gap: 10px;
	padding: 9px;
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
	color: var(--color-ink);
	font-weight: 900;
	text-decoration: none;
}

.grade-mini-item span {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 28px;
	height: 28px;
	border-radius: 6px;
	background: var(--color-primary);
	color: #fff;
}

.grade-mini-item a:hover,
.grade-mini-item a:focus {
	border-color: var(--color-primary);
	background: var(--color-soft);
	color: var(--color-primary);
}

.recent-post-list {
	display: grid;
	gap: 10px;
}

.recent-post-list li {
	padding-bottom: 10px;
	border-bottom: 1px solid var(--color-border);
}

.recent-post-list li:last-child {
	padding-bottom: 0;
	border-bottom: 0;
}

.recent-post-list a {
	display: block;
	color: var(--color-ink);
	font-weight: 800;
	line-height: 1.35;
}

.recent-post-list span {
	display: block;
	margin-top: 3px;
	color: var(--color-muted);
	font-size: 0.84rem;
}

.single-article {
	min-width: 0;
}

.single-header {
	margin-bottom: 18px;
}

.single-header .entry-title {
	font-size: 2rem;
}

.single-thumbnail {
	margin: 0 0 22px;
	overflow: hidden;
	border-radius: var(--radius);
	border: 1px solid var(--color-border);
}

.single-thumbnail img {
	width: 100%;
}

.entry-content {
	color: var(--color-ink);
	font-size: 1.04rem;
}

.entry-content > *:first-child {
	margin-top: 0;
}

.entry-content h2,
.entry-content h3,
.entry-content h4 {
	margin: 1.45em 0 0.55em;
	line-height: 1.25;
}

.entry-content p,
.entry-content ul,
.entry-content ol {
	margin-top: 0;
	margin-bottom: 1em;
}

.entry-content ul,
.entry-content ol {
	padding-left: 1.35em;
}

.entry-content li + li {
	margin-top: 0.3em;
}

.entry-content table {
	display: block;
	width: 100%;
	overflow-x: auto;
	border-collapse: collapse;
}

.entry-content th,
.entry-content td {
	padding: 10px;
	border: 1px solid var(--color-border);
	text-align: left;
}

.entry-content th {
	background: var(--color-soft);
}

.entry-content blockquote {
	margin: 1.4em 0;
	padding: 14px 18px;
	border-left: 4px solid var(--color-yellow);
	background: #fff9df;
}

.entry-content .wp-block-image,
.entry-content figure {
	margin-left: 0;
	margin-right: 0;
}

.alignwide {
	width: min(100%, 1080px);
	max-width: 1080px;
}

.alignfull {
	width: 100vw;
	max-width: 100vw;
	margin-left: calc(50% - 50vw);
}

.entry-footer {
	margin-top: 24px;
	padding-top: 16px;
	border-top: 1px solid var(--color-border);
	color: var(--color-muted);
}

.tag-list {
	display: flex;
	flex-wrap: wrap;
	gap: 8px;
	align-items: center;
}

.tag-list a {
	display: inline-flex;
	padding: 4px 9px;
	border-radius: 6px;
	background: var(--color-soft);
	font-weight: 800;
	text-decoration: none;
}

.lesson-navigation {
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: 12px;
	margin-top: 24px;
}

.lesson-navigation a {
	display: block;
	height: 100%;
	padding: 14px;
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
	background: var(--color-soft);
	font-weight: 900;
	text-decoration: none;
}

.lesson-navigation span {
	display: block;
	margin-top: 4px;
	color: var(--color-ink);
	font-weight: 700;
}

.nav-next {
	text-align: right;
}

.comments-area {
	margin-top: 28px;
	padding-top: 22px;
	border-top: 1px solid var(--color-border);
}

.comment-list {
	margin: 0 0 20px;
	padding-left: 1.25em;
}

.comment-body {
	margin-bottom: 16px;
	padding: 14px;
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
	background: #fff;
}

.comment-form input:not([type="submit"]),
.comment-form textarea {
	width: 100%;
	padding: 10px 12px;
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
}

.comment-form .submit {
	min-height: 42px;
	padding: 10px 16px;
	border: 0;
	border-radius: var(--radius);
	background: var(--color-primary);
	color: #fff;
	font-weight: 900;
}

.grade-archive-header {
	position: relative;
	padding: 18px;
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
	background: linear-gradient(135deg, #fff, #f0f8ff);
}

.grade-archive-header .grade-icon {
	margin-bottom: 10px;
}

.class-hub-header {
	padding: 24px;
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
	background: #fff;
}

.class-hub-intro {
	max-width: 820px;
	margin-top: 12px;
}

.grade-feed-grid {
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: 18px;
	margin-top: 24px;
}

.grade-feed-card {
	padding: 18px;
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
	background: #fff;
}

.grade-feed-heading {
	display: flex;
	align-items: center;
	gap: 12px;
	margin-bottom: 12px;
}

.grade-feed-heading .grade-icon {
	margin-bottom: 0;
}

.grade-feed-heading h2 {
	margin: 0;
	font-size: 1.2rem;
	line-height: 1.25;
}

.lesson-link-list {
	display: grid;
	gap: 9px;
	margin: 0;
	padding: 0;
	list-style: none;
}

.lesson-link-list a {
	display: block;
	padding: 9px 0;
	border-bottom: 1px solid var(--color-border);
	color: var(--color-ink);
	font-weight: 800;
	line-height: 1.35;
}

.lesson-link-list a:hover,
.lesson-link-list a:focus {
	color: var(--color-primary);
	text-decoration: none;
}

.empty-state,
.no-results {
	padding: 22px;
	background: #fff;
}

.empty-state h3,
.no-results h2 {
	margin: 0 0 8px;
}

.empty-state p,
.no-results p {
	margin: 0;
	color: var(--color-muted);
}

.not-found-panel {
	text-align: center;
}

.big-symbol {
	display: inline-flex;
	margin-bottom: 8px;
	color: var(--color-red);
	font-size: 4rem;
	font-weight: 900;
	line-height: 1;
}

.not-found-panel .search-form {
	max-width: 560px;
	margin: 22px auto 0;
}

.quick-grade-links {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	gap: 8px;
	margin-top: 18px;
}

.quick-grade-links a {
	display: inline-flex;
	padding: 7px 10px;
	border: 1px solid var(--color-border);
	border-radius: var(--radius);
	background: var(--color-soft);
	font-weight: 900;
	text-decoration: none;
}

.site-footer {
	background: var(--color-ink);
	color: #dce8f7;
}

.footer-top {
	padding: 34px 0;
}

.footer-grid {
	display: grid;
	grid-template-columns: 1.3fr 1fr 1fr;
	gap: 28px;
}

.footer-widget-title {
	color: #fff;
}

.footer-widget p {
	margin: 0;
}

.footer-links {
	display: grid;
	gap: 8px;
}

.footer-widget a,
.footer-bottom a {
	color: #fff;
	font-weight: 800;
}

.footer-bottom {
	border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-bottom-inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 16px;
	padding: 14px 0;
}

.footer-bottom p {
	margin: 0;
}

.footer-menu {
	display: flex;
	flex-wrap: wrap;
	gap: 12px;
	margin: 0;
	padding: 0;
	list-style: none;
}

.wp-caption {
	max-width: 100%;
}

.wp-caption-text,
.gallery-caption {
	color: var(--color-muted);
	font-size: 0.9rem;
}

.bypostauthor {
	display: block;
}

@media (max-width: 1020px) {
	.grade-grid {
		grid-template-columns: repeat(3, minmax(0, 1fr));
	}

	.post-card-grid,
	.topic-grid,
	.grade-feed-grid {
		grid-template-columns: repeat(2, minmax(0, 1fr));
	}

	.content-sidebar-layout {
		grid-template-columns: minmax(0, 1fr);
	}

	.widget-area {
		grid-template-columns: repeat(2, minmax(0, 1fr));
	}
}

@media (max-width: 820px) {
	.brand-row {
		align-items: flex-start;
		flex-direction: column;
	}

	.header-search {
		width: 100%;
		flex-basis: auto;
	}

	.nav-container {
		display: block;
	}

	.nav-toggle {
		display: inline-flex;
	}

	.nav-menu {
		display: none;
		padding-bottom: 10px;
	}

	.main-navigation.is-open .nav-menu {
		display: grid;
	}

	.nav-menu > li > a {
		min-height: 44px;
		padding: 10px 8px;
	}

	.sub-menu {
		position: static;
		display: block;
		width: 100%;
		margin: 0 0 8px 12px;
		box-shadow: none;
	}

	.hero-grid,
	.topic-layout {
		grid-template-columns: minmax(0, 1fr);
	}

	.hero-visual {
		justify-self: stretch;
	}

	.with-link {
		align-items: flex-start;
		flex-direction: column;
	}

	.footer-grid {
		grid-template-columns: 1fr;
	}

	.footer-bottom-inner {
		align-items: flex-start;
		flex-direction: column;
	}
}

@media (max-width: 640px) {
	body {
		background-size: 22px 22px;
	}

	.container {
		width: min(100% - 24px, 1120px);
	}

	.top-strip-inner,
	.search-form {
		flex-direction: column;
	}

	.lesson-navigation {
		grid-template-columns: minmax(0, 1fr);
	}

	.site-logo img,
	.custom-logo {
		width: 170px;
	}

	.site-title {
		font-size: 1.55rem;
	}

	.home-hero {
		padding: 34px 0;
	}

	.hero-copy h1 {
		font-size: 2rem;
	}

	.math-board {
		min-height: 260px;
		padding: 18px;
	}

	.equation-row {
		font-size: 1.45rem;
	}

	.equation-row span {
		min-width: 48px;
		min-height: 48px;
	}

	.fraction-card {
		right: 18px;
		bottom: 18px;
		width: 58px;
		height: 76px;
	}

	.section-block,
	.page-section {
		padding: 30px 0;
	}

	.grade-grid,
	.post-card-grid,
	.topic-grid,
	.grade-feed-grid,
	.widget-area {
		grid-template-columns: minmax(0, 1fr);
	}

	.post-list-item {
		grid-template-columns: minmax(0, 1fr);
	}

	.post-list-content {
		padding: 0 16px 16px;
	}

	.content-panel,
	.single-article,
	.not-found-panel,
	.no-results {
		padding: 18px;
	}

	.single-header .entry-title {
		font-size: 1.55rem;
	}

	.nav-next {
		text-align: left;
	}
}