/**
 * Búp Măng Non — Design System
 * Tokens, typography, base utilities, accessibility
 */

/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
	/* Brand — đồng bộ logo / live site */
	--bmn-primary: #1bae70;
	--bmn-primary-light: #66bb6a;
	--bmn-primary-dark: #148a58;
	--bmn-secondary: #f0a020;
	--bmn-secondary-hover: #d98910;
	--bmn-accent: #ffd54f;
	--bmn-bg: #f5f7f5;
	--bmn-bg-alt: #eef5f0;
	--bmn-text: #2f3a34;
	--bmn-text-muted: #5c6b62;
	--bmn-white: #ffffff;
	--bmn-dark: #143528;
	--bmn-border: rgba(20, 38, 28, 0.1);
	--bmn-overlay: rgba(14, 61, 42, 0.55);

	/* Typography — scale cân đối tiêu đề / nội dung */
	--bmn-font-heading: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", sans-serif;
	--bmn-font-body: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", sans-serif;
	--bmn-fs-h1: clamp(1.625rem, 3.2vw, 2.375rem); /* ~26–38px */
	--bmn-fs-h2: clamp(1.35rem, 2.4vw, 1.75rem);   /* ~22–28px */
	--bmn-fs-h3: clamp(1.125rem, 1.6vw, 1.35rem);  /* ~18–22px */
	--bmn-fs-h4: clamp(1.05rem, 1.2vw, 1.2rem);    /* ~17–19px */
	--bmn-fs-body: 1rem;                            /* 16px */
	--bmn-fs-sm: 0.875rem;                          /* 14px */
	--bmn-fs-xs: 0.75rem;                           /* 12px */
	--bmn-lh: 1.65;
	--bmn-lh-tight: 1.28;
	--bmn-lh-heading: 1.28;
	--bmn-fw-regular: 400;
	--bmn-fw-medium: 500;
	--bmn-fw-semibold: 600;
	--bmn-fw-bold: 700;

	/* Layout */
	--bmn-radius: 12px;
	--bmn-radius-sm: 8px;
	--bmn-radius-lg: 16px;
	--bmn-radius-pill: 999px;
	--bmn-shadow: 0 4px 18px rgba(20, 38, 28, 0.06);
	--bmn-shadow-hover: 0 10px 28px rgba(20, 38, 28, 0.1);
	--bmn-shadow-cta: 0 6px 20px rgba(240, 160, 32, 0.35);
	--bmn-container: 1120px;
	--bmn-gutter: clamp(1rem, 3.5vw, 1.5rem);
	--bmn-section-py: clamp(2rem, 5vw, 3.5rem);
	--bmn-header-h: 72px;
	--bmn-transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);

	/* Focus */
	--bmn-focus: 0 0 0 3px rgba(27, 174, 112, 0.35);
}

/* Optional light dark mode */
@media (prefers-color-scheme: dark) {
	html.bmn-auto-dark {
		--bmn-bg: #121a13;
		--bmn-bg-alt: #1a241b;
		--bmn-text: #e8e0d8;
		--bmn-text-muted: #bcaaa4;
		--bmn-white: #1e2a1f;
		--bmn-border: rgba(232, 224, 216, 0.12);
		--bmn-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
		--bmn-shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.45);
	}
}

html.bmn-dark {
	--bmn-bg: #121a13;
	--bmn-bg-alt: #1a241b;
	--bmn-text: #e8e0d8;
	--bmn-text-muted: #bcaaa4;
	--bmn-white: #1e2a1f;
	--bmn-border: rgba(232, 224, 216, 0.12);
	--bmn-shadow: 0 4px 20px rgba(0, 0, 0, 0.35);
	--bmn-shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.45);
}

/* --------------------------------------------------------------------------
   Reset / Base
   -------------------------------------------------------------------------- */
.bupmangnon-theme,
.bupmangnon-theme * {
	box-sizing: border-box;
}

.bupmangnon-theme {
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
	text-rendering: optimizeLegibility;
}

.bupmangnon-theme h1,
.bupmangnon-theme h2,
.bupmangnon-theme h3,
.bupmangnon-theme h4,
.bupmangnon-theme h5,
.bupmangnon-theme h6,
.bupmangnon-theme .entry-title,
.bupmangnon-theme .ast-archive-title {
	font-family: var(--bmn-font-heading);
	font-weight: var(--bmn-fw-bold);
	line-height: var(--bmn-lh-heading);
	color: var(--bmn-dark);
	letter-spacing: -0.015em;
	text-wrap: balance;
}

.bupmangnon-theme h1 { font-size: var(--bmn-fs-h1); }
.bupmangnon-theme h2 { font-size: var(--bmn-fs-h2); }
.bupmangnon-theme h3 { font-size: var(--bmn-fs-h3); font-weight: var(--bmn-fw-semibold); }
.bupmangnon-theme h4 { font-size: var(--bmn-fs-h4); font-weight: var(--bmn-fw-semibold); }

.bupmangnon-theme p,
.bupmangnon-theme li,
.bupmangnon-theme .entry-content {
	font-size: var(--bmn-fs-body);
	line-height: var(--bmn-lh);
	color: var(--bmn-text);
}

.bupmangnon-theme .entry-content p + p {
	margin-top: 0.85em;
}

.bupmangnon-theme a {
	color: var(--bmn-primary);
	text-decoration-thickness: 1px;
	text-underline-offset: 0.15em;
	transition: color var(--bmn-transition);
}

.bupmangnon-theme a:hover {
	color: var(--bmn-primary-dark);
}

.bupmangnon-theme :focus-visible {
	outline: none;
	box-shadow: var(--bmn-focus);
	border-radius: 4px;
}

/* --------------------------------------------------------------------------
   Layout helpers
   -------------------------------------------------------------------------- */
.bmn-container {
	width: 100%;
	max-width: var(--bmn-container);
	margin-inline: auto;
	padding-inline: var(--bmn-gutter);
}

.bmn-section {
	padding-block: var(--bmn-section-py);
}

.bmn-section--alt {
	background: var(--bmn-bg-alt);
}

.bmn-section__header {
	text-align: center;
	max-width: 40rem;
	margin: 0 auto clamp(1.5rem, 3vw, 2.25rem);
}

.bmn-section__eyebrow {
	display: inline-block;
	font-size: var(--bmn-fs-xs);
	font-weight: var(--bmn-fw-semibold);
	letter-spacing: 0.07em;
	text-transform: uppercase;
	color: var(--bmn-primary);
	background: rgba(46, 125, 50, 0.1);
	padding: 0.3em 0.85em;
	border-radius: var(--bmn-radius-pill);
	margin-bottom: 0.55rem;
	line-height: 1.3;
}

.bmn-section__title {
	margin: 0 0 0.5rem;
	color: var(--bmn-dark);
	font-size: var(--bmn-fs-h2);
	line-height: var(--bmn-lh-heading);
	font-weight: var(--bmn-fw-bold);
}

.bmn-section__desc {
	margin: 0 auto;
	color: var(--bmn-text-muted);
	font-size: var(--bmn-fs-sm);
	line-height: 1.6;
	max-width: 36em;
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.bmn-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 0.5rem;
	padding: 0.9rem 1.75rem;
	font-family: var(--bmn-font-heading);
	font-size: 1rem;
	font-weight: var(--bmn-fw-semibold);
	line-height: 1.2;
	text-decoration: none !important;
	border: 2px solid transparent;
	border-radius: var(--bmn-radius-pill);
	cursor: pointer;
	transition: transform var(--bmn-transition), box-shadow var(--bmn-transition), background var(--bmn-transition), color var(--bmn-transition), border-color var(--bmn-transition);
	min-height: 48px; /* a11y touch target */
}

.bmn-btn:hover {
	transform: translateY(-2px);
}

.bmn-btn:active {
	transform: translateY(0);
}

.bmn-btn--primary {
	background: var(--bmn-primary);
	color: var(--bmn-white) !important;
	box-shadow: 0 4px 16px rgba(46, 125, 50, 0.3);
}

.bmn-btn--primary:hover {
	background: var(--bmn-primary-dark);
	color: var(--bmn-white) !important;
}

.bmn-btn--donate {
	background: var(--bmn-secondary);
	color: var(--bmn-white) !important;
	box-shadow: var(--bmn-shadow-cta);
}

.bmn-btn--donate:hover {
	background: var(--bmn-secondary-hover);
	color: var(--bmn-white) !important;
	box-shadow: 0 8px 28px rgba(255, 138, 101, 0.45);
}

.bmn-btn--outline {
	background: transparent;
	color: var(--bmn-white) !important;
	border-color: var(--bmn-white);
}

.bmn-btn--outline:hover {
	background: var(--bmn-white);
	color: var(--bmn-primary) !important;
}

.bmn-btn--outline-dark {
	background: transparent;
	color: var(--bmn-primary) !important;
	border-color: var(--bmn-primary);
}

.bmn-btn--outline-dark:hover {
	background: var(--bmn-primary);
	color: var(--bmn-white) !important;
}

.bmn-btn--lg {
	padding: 1.1rem 2.25rem;
	font-size: 1.0625rem;
}

.bmn-btn--sm {
	padding: 0.55rem 1.15rem;
	font-size: var(--bmn-fs-sm);
	min-height: 40px;
}

.bmn-btn-group {
	display: flex;
	flex-wrap: wrap;
	gap: 0.85rem;
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */
.bmn-card {
	background: var(--bmn-white);
	border-radius: var(--bmn-radius);
	box-shadow: var(--bmn-shadow);
	overflow: hidden;
	transition: transform var(--bmn-transition), box-shadow var(--bmn-transition);
	border: 1px solid var(--bmn-border);
	height: 100%;
	display: flex;
	flex-direction: column;
}

.bmn-card:hover {
	transform: translateY(-4px);
	box-shadow: var(--bmn-shadow-hover);
}

.bmn-card__media {
	position: relative;
	aspect-ratio: 16 / 10;
	overflow: hidden;
	background: var(--bmn-bg-alt);
}

.bmn-card__media img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	transition: transform 0.45s ease;
}

.bmn-card:hover .bmn-card__media img {
	transform: scale(1.04);
}

.bmn-card__body {
	padding: 1.15rem 1.25rem 1.35rem;
	display: flex;
	flex-direction: column;
	flex: 1;
	gap: 0.5rem;
}

.bmn-card__meta {
	font-size: var(--bmn-fs-xs);
	color: var(--bmn-text-muted);
	font-weight: var(--bmn-fw-medium);
	line-height: 1.4;
}

.bmn-card__title {
	margin: 0;
	font-size: 1.0625rem; /* ~17px — gọn so với body 16px */
	font-weight: var(--bmn-fw-semibold);
	line-height: 1.35;
	letter-spacing: -0.01em;
}

.bmn-card__title a {
	color: var(--bmn-dark);
	text-decoration: none;
}

.bmn-card__title a:hover {
	color: var(--bmn-primary);
}

.bmn-card__excerpt {
	margin: 0;
	font-size: var(--bmn-fs-sm);
	color: var(--bmn-text-muted);
	line-height: 1.55;
	flex: 1;
}

.bmn-card__footer {
	margin-top: auto;
	padding-top: 0.5rem;
}

/* --------------------------------------------------------------------------
   Grid
   -------------------------------------------------------------------------- */
.bmn-grid {
	display: grid;
	gap: 1.5rem;
}

.bmn-grid--2 { grid-template-columns: 1fr; }
.bmn-grid--3 { grid-template-columns: 1fr; }
.bmn-grid--4 { grid-template-columns: 1fr; }
.bmn-grid--5 { grid-template-columns: 1fr 1fr; }

@media (min-width: 600px) {
	.bmn-grid--2 { grid-template-columns: repeat(2, 1fr); }
	.bmn-grid--3 { grid-template-columns: repeat(2, 1fr); }
	.bmn-grid--4 { grid-template-columns: repeat(2, 1fr); }
	.bmn-grid--5 { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 900px) {
	.bmn-grid--3 { grid-template-columns: repeat(3, 1fr); }
	.bmn-grid--4 { grid-template-columns: repeat(4, 1fr); }
	.bmn-grid--5 { grid-template-columns: repeat(5, 1fr); }
}

/* --------------------------------------------------------------------------
   Screen reader / a11y
   -------------------------------------------------------------------------- */
.bmn-sr-only {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
	border: 0;
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
	*,
	*::before,
	*::after {
		animation-duration: 0.01ms !important;
		animation-iteration-count: 1 !important;
		transition-duration: 0.01ms !important;
		scroll-behavior: auto !important;
	}
}

/* Skip link */
.bmn-skip-link {
	position: absolute;
	top: -100px;
	left: var(--bmn-gutter);
	z-index: 100000;
	background: var(--bmn-primary);
	color: var(--bmn-white) !important;
	padding: 0.75rem 1.25rem;
	border-radius: var(--bmn-radius-sm);
	text-decoration: none !important;
	font-weight: var(--bmn-fw-semibold);
}

.bmn-skip-link:focus {
	top: 1rem;
}