/**
 * 教辅百宝箱 - 全局样式 v1.1
 */

:root {
	--edu-ink: #142019;
	--edu-muted: #5c6b63;
	--edu-paper: #f3efe6;
	--edu-leaf: #2f6b4f;
	--edu-leaf-dark: #1a3d2e;
	--edu-accent: #c4782b;
	--edu-accent-soft: #f3e0c8;
	--edu-line: #ddd4c5;
	--edu-white: #fffcf7;
	--edu-panel: #ffffff;
	--edu-radius: 14px;
	--edu-radius-sm: 10px;
	--edu-shadow: 0 12px 40px rgba(20, 32, 25, 0.08);
	--edu-shadow-sm: 0 6px 18px rgba(20, 32, 25, 0.06);
	--edu-font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, serif;
	--edu-font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

html {
	scroll-behavior: smooth;
}

body {
	font-family: var(--edu-font-body);
	color: var(--edu-ink);
	background:
		radial-gradient(ellipse 80% 50% at 0% -10%, rgba(47, 107, 79, 0.12), transparent 50%),
		radial-gradient(ellipse 60% 40% at 100% 0%, rgba(196, 120, 43, 0.1), transparent 45%),
		linear-gradient(180deg, #f8f5ee 0%, var(--edu-paper) 35%, #efe9dc 100%);
	min-height: 100vh;
	line-height: 1.65;
	display: flex;
	flex-direction: column;
}

.edu-main {
	flex: 1 0 auto;
}

a {
	color: var(--edu-leaf);
}

a:hover {
	color: var(--edu-leaf-dark);
}

h1, h2, h3, .edu-brand-text, .edu-banner-title, .edu-section-title, .edu-banner-brand {
	font-family: var(--edu-font-display);
	letter-spacing: 0.02em;
}

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

/* Header */
.edu-site-header {
	background: rgba(255, 252, 247, 0.82);
	backdrop-filter: blur(12px);
	border-bottom: 1px solid rgba(221, 212, 197, 0.8);
	position: sticky;
	top: 0;
	z-index: 100;
	transition: box-shadow 0.25s ease;
}

.edu-site-header.is-scrolled {
	box-shadow: 0 8px 24px rgba(20, 32, 25, 0.06);
}

.edu-brand-text {
	font-size: 1.28rem;
	font-weight: 700;
	color: var(--edu-leaf-dark);
}

.edu-logo {
	max-height: 42px;
	width: auto;
}

.edu-navbar {
	padding-top: 0.65rem;
	padding-bottom: 0.65rem;
}

.edu-navbar .nav-link {
	color: var(--edu-ink);
	font-weight: 500;
	padding: 0.45rem 0.85rem !important;
	border-radius: 999px;
	transition: background 0.2s ease, color 0.2s ease;
}

.edu-navbar .nav-link:hover,
.edu-navbar .nav-item.active > .nav-link {
	color: var(--edu-leaf-dark);
	background: rgba(47, 107, 79, 0.08);
}

.edu-navbar .dropdown-menu {
	border: 1px solid var(--edu-line);
	border-radius: var(--edu-radius-sm);
	box-shadow: var(--edu-shadow-sm);
	padding: 0.4rem;
}

.edu-navbar .dropdown-item {
	border-radius: 8px;
	padding: 0.45rem 0.75rem;
}

.edu-navbar .dropdown-item:hover {
	background: rgba(47, 107, 79, 0.08);
	color: var(--edu-leaf-dark);
}

/* Banner — full bleed */
.edu-banner {
	position: relative;
	overflow: hidden;
	color: #fff;
	min-height: clamp(360px, 58vh, 520px);
	display: flex;
	align-items: center;
	background:
		linear-gradient(125deg, rgba(18, 48, 36, 0.94) 0%, rgba(47, 107, 79, 0.88) 48%, rgba(36, 84, 62, 0.9) 100%),
		url("../images/banner-pattern.svg") center / 120px;
}

.edu-banner-grid {
	position: absolute;
	inset: 0;
	background:
		linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
		linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
	background-size: 48px 48px;
	mask-image: radial-gradient(ellipse at center, #000 20%, transparent 75%);
	pointer-events: none;
	animation: edu-grid-drift 28s linear infinite;
}

.edu-banner::before {
	content: "";
	position: absolute;
	width: 520px;
	height: 520px;
	right: -120px;
	bottom: -180px;
	border-radius: 50%;
	background: radial-gradient(circle, rgba(196, 120, 43, 0.28), transparent 65%);
	pointer-events: none;
}

.edu-banner::after {
	content: "";
	position: absolute;
	width: 280px;
	height: 280px;
	left: 8%;
	top: -80px;
	border-radius: 50%;
	border: 1px solid rgba(255, 255, 255, 0.12);
	pointer-events: none;
	animation: edu-float 8s ease-in-out infinite;
}

.edu-banner-inner {
	position: relative;
	z-index: 1;
	text-align: center;
	padding: 4.5rem 1rem 4rem;
}

.edu-banner-brand {
	display: inline-block;
	margin: 0 0 1rem;
	padding: 0.28rem 0.9rem;
	font-size: 0.85rem;
	font-weight: 600;
	letter-spacing: 0.12em;
	border: 1px solid rgba(255, 255, 255, 0.28);
	border-radius: 999px;
	background: rgba(255, 255, 255, 0.08);
	animation: edu-fade-up 0.7s ease both;
}

.edu-banner-title {
	font-size: clamp(2.2rem, 5.5vw, 3.4rem);
	font-weight: 700;
	line-height: 1.2;
	margin: 0 0 1rem;
	animation: edu-fade-up 0.7s ease 0.08s both;
	text-shadow: 0 2px 24px rgba(0, 0, 0, 0.15);
}

.edu-banner-subtitle {
	max-width: 34rem;
	margin: 0 auto 1.75rem;
	font-size: 1.05rem;
	opacity: 0.92;
	animation: edu-fade-up 0.7s ease 0.16s both;
}

.edu-banner-actions {
	display: flex;
	flex-wrap: wrap;
	gap: 0.75rem;
	justify-content: center;
	animation: edu-fade-up 0.7s ease 0.24s both;
}

/* Buttons */
.edu-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 0.35rem;
	padding: 0.72rem 1.35rem;
	border-radius: 999px;
	font-weight: 600;
	font-size: 0.95rem;
	text-decoration: none;
	border: 1px solid transparent;
	transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.edu-btn:hover {
	transform: translateY(-2px);
	text-decoration: none;
}

.edu-btn-primary {
	background: var(--edu-accent);
	color: #fff;
	box-shadow: 0 8px 22px rgba(196, 120, 43, 0.35);
}

.edu-btn-primary:hover {
	background: #a8631f;
	color: #fff;
}

.edu-btn-ghost {
	background: rgba(255, 255, 255, 0.1);
	border-color: rgba(255, 255, 255, 0.35);
	color: #fff;
}

.edu-btn-ghost:hover {
	background: rgba(255, 255, 255, 0.18);
	color: #fff;
}

.btn-primary {
	--bs-btn-bg: var(--edu-leaf);
	--bs-btn-border-color: var(--edu-leaf);
	--bs-btn-hover-bg: var(--edu-leaf-dark);
	--bs-btn-hover-border-color: var(--edu-leaf-dark);
	--bs-btn-active-bg: var(--edu-leaf-dark);
	--bs-btn-active-border-color: var(--edu-leaf-dark);
	border-radius: 999px;
	font-weight: 600;
	padding: 0.55rem 1.2rem;
}

.btn-outline-secondary {
	border-radius: 999px;
	font-weight: 600;
}

/* Features strip */
.edu-features {
	margin-top: -1.75rem;
	position: relative;
	z-index: 2;
	padding: 0 0 0.5rem;
}

.edu-features-row {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 1rem;
	background: var(--edu-panel);
	border: 1px solid var(--edu-line);
	border-radius: var(--edu-radius);
	padding: 1.15rem 1.25rem;
	box-shadow: var(--edu-shadow);
}

.edu-feature-item {
	display: flex;
	gap: 0.85rem;
	align-items: flex-start;
	padding: 0.35rem 0.5rem;
}

.edu-feature-mark {
	flex-shrink: 0;
	width: 2.1rem;
	height: 2.1rem;
	border-radius: 50%;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	font-size: 0.75rem;
	font-weight: 700;
	color: var(--edu-leaf-dark);
	background: var(--edu-accent-soft);
}

.edu-feature-item strong {
	display: block;
	font-size: 0.98rem;
	margin-bottom: 0.15rem;
	color: var(--edu-ink);
}

.edu-feature-item p {
	margin: 0;
	font-size: 0.85rem;
	color: var(--edu-muted);
	line-height: 1.45;
}

/* Sections */
.edu-tools-section,
.edu-articles-section {
	padding: 3.5rem 0;
}

.edu-articles-section {
	padding-bottom: 4.5rem;
}

.edu-section-head {
	display: flex;
	justify-content: space-between;
	align-items: flex-end;
	gap: 1rem;
	margin-bottom: 1.75rem;
}

.edu-eyebrow {
	margin: 0 0 0.25rem;
	font-size: 0.75rem;
	letter-spacing: 0.16em;
	text-transform: uppercase;
	color: var(--edu-accent);
	font-weight: 700;
}

.edu-section-title {
	font-size: clamp(1.45rem, 2.5vw, 1.85rem);
	color: var(--edu-leaf-dark);
	margin: 0;
	position: relative;
	padding-bottom: 0.5rem;
}

.edu-section-title::after {
	content: "";
	display: block;
	width: 2.75rem;
	height: 3px;
	margin-top: 0.45rem;
	border-radius: 2px;
	background: linear-gradient(90deg, var(--edu-accent), transparent);
}

.edu-more-link {
	color: var(--edu-leaf);
	text-decoration: none;
	font-size: 0.92rem;
	font-weight: 600;
	white-space: nowrap;
	padding: 0.35rem 0.75rem;
	border-radius: 999px;
	border: 1px solid transparent;
	transition: border-color 0.2s ease, background 0.2s ease;
}

.edu-more-link:hover {
	border-color: var(--edu-line);
	background: rgba(255, 255, 255, 0.7);
	color: var(--edu-leaf-dark);
}

.edu-muted-line,
.edu-empty-hint {
	color: var(--edu-muted);
}

.edu-empty-hint {
	padding: 2rem;
	text-align: center;
	background: rgba(255, 255, 255, 0.65);
	border: 1px dashed var(--edu-line);
	border-radius: var(--edu-radius);
}

.edu-empty-hint .edu-btn {
	margin-top: 0.75rem;
}

/* Tool cards */
.edu-tool-card {
	display: block;
	text-decoration: none;
	color: inherit;
	text-align: center;
	padding: 1.35rem 1rem 1.2rem;
	height: 100%;
	background: var(--edu-panel);
	border: 1px solid var(--edu-line);
	border-radius: var(--edu-radius);
	box-shadow: var(--edu-shadow-sm);
	transition: transform 0.28s ease, box-shadow 0.28s ease, border-color 0.28s ease;
}

.edu-tool-card:hover {
	transform: translateY(-6px);
	color: inherit;
	border-color: rgba(47, 107, 79, 0.35);
	box-shadow: 0 16px 36px rgba(20, 32, 25, 0.1);
}

.edu-tool-thumb {
	width: 84px;
	height: 84px;
	margin: 0 auto 1rem;
	border-radius: 22px;
	background: linear-gradient(145deg, #e8f2ec, #f7f3eb);
	border: 1px solid rgba(47, 107, 79, 0.12);
	display: flex;
	align-items: center;
	justify-content: center;
	overflow: hidden;
	transition: transform 0.28s ease;
}

.edu-tool-card:hover .edu-tool-thumb {
	transform: scale(1.05);
}

.edu-tool-thumb.has-image {
	border-radius: 18px;
}

.edu-tool-thumb img {
	width: 100%;
	height: 100%;
	object-fit: cover;
}

.edu-tool-icon {
	font-family: var(--edu-font-display);
	font-size: 1.55rem;
	font-weight: 700;
	color: var(--edu-leaf);
}

.edu-tool-name {
	font-size: 1.02rem;
	margin: 0 0 0.3rem;
	font-weight: 700;
}

.edu-tool-cat {
	display: inline-block;
	font-size: 0.75rem;
	color: var(--edu-leaf-dark);
	background: rgba(47, 107, 79, 0.1);
	padding: 0.15rem 0.55rem;
	border-radius: 999px;
}

/* Article cards */
.edu-article-card {
	height: 100%;
}

.edu-article-link {
	display: flex;
	flex-direction: column;
	height: 100%;
	text-decoration: none;
	color: inherit;
	background: var(--edu-panel);
	border: 1px solid var(--edu-line);
	border-radius: var(--edu-radius);
	overflow: hidden;
	box-shadow: var(--edu-shadow-sm);
	transition: transform 0.28s ease, box-shadow 0.28s ease;
}

.edu-article-link:hover {
	transform: translateY(-4px);
	box-shadow: var(--edu-shadow);
	color: inherit;
}

.edu-article-thumb {
	margin: 0;
	overflow: hidden;
	aspect-ratio: 16 / 10;
	background:
		linear-gradient(135deg, #dfece4, #f0e6d4);
}

.edu-article-thumb img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	transition: transform 0.45s ease;
}

.edu-article-link:hover .edu-article-thumb img {
	transform: scale(1.05);
}

.edu-article-body {
	padding: 1rem 1.05rem 1.15rem;
	display: flex;
	flex-direction: column;
	flex: 1;
}

.edu-article-title {
	font-size: 1.05rem;
	margin: 0 0 0.45rem;
	line-height: 1.4;
	font-weight: 700;
}

.edu-article-excerpt {
	font-size: 0.88rem;
	color: var(--edu-muted);
	margin-bottom: 0.75rem;
	flex: 1;
}

.edu-article-date {
	font-size: 0.78rem;
	color: var(--edu-muted);
}

/* Tool single */
.edu-tool-panel,
.edu-preview-wrap {
	background: var(--edu-panel);
	border: 1px solid var(--edu-line);
	border-radius: var(--edu-radius);
	padding: 1.5rem;
	box-shadow: var(--edu-shadow-sm);
}

.edu-tool-title {
	font-size: 1.65rem;
	margin-bottom: 0.85rem;
	color: var(--edu-leaf-dark);
}

.edu-tool-desc {
	font-size: 0.95rem;
	color: var(--edu-muted);
	margin-bottom: 1rem;
}

.edu-tool-tips {
	background: linear-gradient(90deg, #eef6f1, #f7faf8);
	border-left: 3px solid var(--edu-leaf);
	padding: 0.85rem 1rem;
	margin-bottom: 1.25rem;
	font-size: 0.9rem;
	border-radius: 0 var(--edu-radius-sm) var(--edu-radius-sm) 0;
}

.edu-preview-wrap {
	min-height: 420px;
}

.edu-preview-area {
	min-height: 360px;
	display: flex;
	align-items: center;
	justify-content: center;
	background:
		linear-gradient(45deg, #efe9de 25%, transparent 25%) -12px 0 / 24px 24px,
		linear-gradient(-45deg, #efe9de 25%, transparent 25%) -12px 0 / 24px 24px,
		#faf6ef;
	border-radius: var(--edu-radius-sm);
	padding: 1rem;
	overflow: auto;
	border: 1px dashed var(--edu-line);
}

.edu-preview-area img {
	max-width: 100%;
	height: auto;
	box-shadow: var(--edu-shadow-sm);
	background: #fff;
	border-radius: 4px;
}

.edu-preview-placeholder {
	color: var(--edu-muted);
	margin: 0;
}

.edu-loading {
	color: var(--edu-accent);
	font-size: 0.9rem;
	font-weight: 600;
}

.edu-slider-val {
	min-width: 2rem;
	text-align: right;
	font-variant-numeric: tabular-nums;
	color: var(--edu-leaf-dark);
	font-weight: 700;
}

/* Content pages */
.edu-post-single,
.edu-page,
.edu-archive-title {
	color: var(--edu-ink);
}

.edu-post-content,
.edu-page-content {
	background: var(--edu-panel);
	border: 1px solid var(--edu-line);
	border-radius: var(--edu-radius);
	padding: 1.75rem;
	box-shadow: var(--edu-shadow-sm);
}

.edu-sidebar .widget {
	background: var(--edu-panel);
	border: 1px solid var(--edu-line);
	border-radius: var(--edu-radius);
	padding: 1.15rem 1.25rem;
	margin-bottom: 1rem;
	box-shadow: var(--edu-shadow-sm);
}

.edu-sidebar .widget-title {
	font-size: 1rem;
	margin-bottom: 0.75rem;
	color: var(--edu-leaf-dark);
}

/* Kousuan */
.edu-kousuan-table {
	width: 100%;
	background: #fff;
	border-collapse: separate;
	border-spacing: 0 0.75rem;
}

.edu-kousuan-item {
	padding: 0.5rem 0.75rem;
	font-size: 1.05rem;
	vertical-align: middle;
}

.edu-kousuan-blank {
	margin-left: 0.5rem;
	letter-spacing: 0.05em;
	color: var(--edu-muted);
}

/* Footer */
.edu-site-footer {
	margin-top: auto;
	border-top: 1px solid var(--edu-line);
	background: linear-gradient(180deg, rgba(255, 252, 247, 0.5), rgba(255, 252, 247, 0.95));
	font-size: 0.9rem;
	color: var(--edu-muted);
}

.edu-footer-menu .menu-item {
	list-style: none;
	margin: 0;
	padding: 0;
}

.edu-footer-menu a {
	color: var(--edu-muted);
	text-decoration: none;
	font-weight: 500;
}

.edu-footer-menu a:hover {
	color: var(--edu-leaf);
}

.edu-tool-embed {
	border: 1px solid var(--edu-line);
	border-radius: var(--edu-radius);
	padding: 1.35rem;
	margin: 1.5rem 0;
	background: var(--edu-panel);
	box-shadow: var(--edu-shadow-sm);
}

/* Reveal on scroll */
.edu-reveal {
	opacity: 0;
	transform: translateY(18px);
	transition: opacity 0.55s ease, transform 0.55s ease;
}

.edu-reveal.is-visible {
	opacity: 1;
	transform: translateY(0);
}

@keyframes edu-fade-up {
	from {
		opacity: 0;
		transform: translateY(14px);
	}
	to {
		opacity: 1;
		transform: translateY(0);
	}
}

@keyframes edu-float {
	0%, 100% { transform: translateY(0); }
	50% { transform: translateY(12px); }
}

@keyframes edu-grid-drift {
	from { background-position: 0 0, 0 0; }
	to { background-position: 48px 48px, 48px 48px; }
}

@media (max-width: 991.98px) {
	.edu-features-row {
		grid-template-columns: 1fr;
	}
}

@media (max-width: 767.98px) {
	.edu-banner-inner {
		padding: 3.25rem 1rem 3rem;
	}

	.edu-tool-thumb {
		width: 72px;
		height: 72px;
		border-radius: 18px;
	}

	.edu-preview-wrap,
	.edu-tool-panel,
	.edu-post-content,
	.edu-page-content {
		padding: 1.1rem;
	}

	.edu-section-head {
		flex-direction: column;
		align-items: flex-start;
	}

	.edu-features {
		margin-top: -1rem;
	}
}