/**
 * AskIfra Base CSS
 * Custom Properties, Reset, Typography, Utilities
 *
 * @package AskIfra
 * @since 1.0.0
 */

/* ==========================================================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ========================================================================== */

:root {
	/* Brand Colors */
	--color-primary:        #2E8B73;
	--color-primary-dark:   #246d5a;
	--color-primary-light:  #e8f5f2;
	--color-secondary:      #6FC2AE;
	--color-accent:         #34A853;
	--color-accent-dark:    #2a8c44;

	/* Neutrals */
	--color-bg:             #F7FAF9;
	--color-surface:        #FFFFFF;
	--color-border:         #E5E7EB;
	--color-border-light:   #F3F4F6;

	/* Text */
	--color-text-primary:   #1F2937;
	--color-text-secondary: #6B7280;
	--color-text-muted:     #9CA3AF;
	--color-text-inverse:   #FFFFFF;

	/* Shadows */
	--shadow-xs:   0 1px 2px rgba(0,0,0,0.05);
	--shadow-sm:   0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
	--shadow-md:   0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
	--shadow-lg:   0 10px 15px rgba(0,0,0,0.08), 0 4px 6px rgba(0,0,0,0.04);
	--shadow-xl:   0 20px 25px rgba(0,0,0,0.08), 0 10px 10px rgba(0,0,0,0.03);

	/* Typography */
	--font-family:          'Poppins', sans-serif;
	--font-size-xs:         0.75rem;    /* 12px */
	--font-size-sm:         0.875rem;   /* 14px */
	--font-size-base:       1rem;       /* 16px */
	--font-size-md:         1.0625rem;  /* 17px */
	--font-size-lg:         1.125rem;   /* 18px */
	--font-size-xl:         1.25rem;    /* 20px */
	--font-size-2xl:        1.5rem;     /* 24px */
	--font-size-3xl:        1.875rem;   /* 30px */
	--font-size-4xl:        2.25rem;    /* 36px */
	--font-size-5xl:        3rem;       /* 48px */

	--font-weight-regular:  400;
	--font-weight-medium:   500;
	--font-weight-semibold: 600;
	--font-weight-bold:     700;
	--font-weight-extrabold:800;

	--line-height-tight:    1.25;
	--line-height-snug:     1.375;
	--line-height-normal:   1.5;
	--line-height-relaxed:  1.625;
	--line-height-loose:    1.75;

	/* Spacing */
	--space-1:   0.25rem;   /* 4px  */
	--space-2:   0.5rem;    /* 8px  */
	--space-3:   0.75rem;   /* 12px */
	--space-4:   1rem;      /* 16px */
	--space-5:   1.25rem;   /* 20px */
	--space-6:   1.5rem;    /* 24px */
	--space-8:   2rem;      /* 32px */
	--space-10:  2.5rem;    /* 40px */
	--space-12:  3rem;      /* 48px */
	--space-16:  4rem;      /* 64px */
	--space-20:  5rem;      /* 80px */
	--space-24:  6rem;      /* 96px */

	/* Border Radius */
	--radius-sm:   4px;
	--radius-md:   8px;
	--radius-lg:   12px;
	--radius-xl:   16px;
	--radius-2xl:  24px;
	--radius-full: 9999px;

	/* Transitions */
	--transition-fast:   150ms ease;
	--transition-base:   250ms ease;
	--transition-slow:   400ms ease;

	/* Layout */
	--container-max:     1240px;
	--container-narrow:  780px;
	--container-pad:     1.5rem;

	/* Z-index */
	--z-dropdown:   100;
	--z-sticky:     200;
	--z-fixed:      300;
	--z-overlay:    400;
	--z-modal:      500;
}

/* ==========================================================================
   MODERN CSS RESET
   ========================================================================== */

*,
*::before,
*::after {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

html {
	font-size: 16px;
	scroll-behavior: smooth;
	-webkit-text-size-adjust: 100%;
	text-size-adjust: 100%;
}

body {
	font-family: var(--font-family);
	font-size: var(--font-size-base);
	font-weight: var(--font-weight-regular);
	line-height: var(--line-height-relaxed);
	color: var(--color-text-primary);
	background-color: var(--color-bg);
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

img,
picture,
video,
canvas,
svg {
	display: block;
	max-width: 100%;
}

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

p,
h1,
h2,
h3,
h4,
h5,
h6 {
	overflow-wrap: break-word;
}

ul,
ol {
	list-style: none;
}

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

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

a:focus-visible {
	outline: 2px solid var(--color-primary);
	outline-offset: 3px;
	border-radius: var(--radius-sm);
}

button {
	cursor: pointer;
	background: none;
	border: none;
}

button:focus-visible {
	outline: 2px solid var(--color-primary);
	outline-offset: 3px;
}

/* ==========================================================================
   TYPOGRAPHY
   ========================================================================== */

h1, h2, h3, h4, h5, h6 {
	font-family: var(--font-family);
	font-weight: var(--font-weight-bold);
	line-height: var(--line-height-tight);
	color: var(--color-text-primary);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
	margin-bottom: var(--space-4);
	line-height: var(--line-height-relaxed);
}

p:last-child {
	margin-bottom: 0;
}

strong, b {
	font-weight: var(--font-weight-semibold);
}

small {
	font-size: var(--font-size-sm);
}

blockquote {
	border-left: 4px solid var(--color-primary);
	padding: var(--space-4) var(--space-6);
	margin: var(--space-6) 0;
	background: var(--color-primary-light);
	border-radius: 0 var(--radius-md) var(--radius-md) 0;
	font-style: italic;
	color: var(--color-text-secondary);
}

/* ==========================================================================
   LAYOUT UTILITIES
   ========================================================================== */

.container {
	width: 100%;
	max-width: var(--container-max);
	margin-inline: auto;
	padding-inline: var(--container-pad);
}

.container--narrow {
	max-width: var(--container-narrow);
}

.section {
	padding-block: var(--space-16);
}

.section--sm {
	padding-block: var(--space-10);
}

.section--lg {
	padding-block: var(--space-20);
}

/* Grid helpers */
.grid {
	display: grid;
	gap: var(--space-6);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

/* Flex helpers */
.flex { display: flex; }
.flex--center { align-items: center; justify-content: center; }
.flex--between { align-items: center; justify-content: space-between; }
.flex--gap { gap: var(--space-4); }

/* ==========================================================================
   COMPONENT UTILITIES
   ========================================================================== */

/* Section Heading */
.section-heading {
	display: flex;
	align-items: center;
	justify-content: space-between;
	margin-bottom: var(--space-8);
	padding-bottom: var(--space-4);
	border-bottom: 2px solid var(--color-border);
}

.section-heading__title {
	font-size: var(--font-size-2xl);
	font-weight: var(--font-weight-bold);
	color: var(--color-text-primary);
	position: relative;
}

/* .section-heading__title::before intentionally removed — accent line lives on .section-heading::after */

.section-heading__link {
	font-size: var(--font-size-sm);
	font-weight: var(--font-weight-medium);
	color: var(--color-primary);
	border: 1.5px solid var(--color-primary);
	padding: var(--space-2) var(--space-4);
	border-radius: var(--radius-full);
	transition: all var(--transition-base);
}

.section-heading__link:hover {
	background: var(--color-primary);
	color: var(--color-text-inverse);
}

/* Badges / Tags */
.badge {
	display: inline-block;
	font-size: var(--font-size-xs);
	font-weight: var(--font-weight-semibold);
	padding: 3px var(--space-3);
	border-radius: var(--radius-full);
	text-transform: uppercase;
	letter-spacing: 0.05em;
	line-height: 1.5;
}

.badge--primary {
	background: var(--color-primary);
	color: var(--color-text-inverse);
}

.badge--light {
	background: var(--color-primary-light);
	color: var(--color-primary);
}

.badge--accent {
	background: var(--color-accent);
	color: var(--color-text-inverse);
}

/* Buttons */
.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: var(--space-2);
	padding: var(--space-3) var(--space-6);
	font-size: var(--font-size-sm);
	font-weight: var(--font-weight-semibold);
	line-height: 1.5;
	border-radius: var(--radius-full);
	transition: all var(--transition-base);
	cursor: pointer;
	border: 2px solid transparent;
	white-space: nowrap;
}

.btn--primary {
	background: var(--color-primary);
	color: var(--color-text-inverse);
	box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
	background: var(--color-primary-dark);
	color: var(--color-text-inverse);
	box-shadow: var(--shadow-md);
	transform: translateY(-1px);
}

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

.btn--outline:hover {
	background: var(--color-primary);
	color: var(--color-text-inverse);
}

.btn--sm {
	padding: var(--space-2) var(--space-4);
	font-size: var(--font-size-xs);
}

/* Post Meta */
.post-meta {
	display: flex;
	align-items: center;
	flex-wrap: wrap;
	gap: var(--space-4);
	font-size: var(--font-size-sm);
	color: var(--color-text-secondary);
}

.post-meta__item {
	display: flex;
	align-items: center;
	gap: var(--space-1);
}

.post-meta__item svg {
	width: 14px;
	height: 14px;
	flex-shrink: 0;
	color: var(--color-primary);
}

/* Cards base */
.card {
	background: var(--color-surface);
	border-radius: var(--radius-xl);
	box-shadow: var(--shadow-sm);
	overflow: hidden;
	transition: transform var(--transition-base), box-shadow var(--transition-base);
}

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

/* Thumbnail */
.post-thumbnail {
	position: relative;
	overflow: hidden;
	background: var(--color-border-light);
}

.post-thumbnail img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	transition: transform var(--transition-slow);
}

.post-thumbnail:hover img,
.card:hover .post-thumbnail img {
	transform: scale(1.04);
}

/* ==========================================================================
   ACCESSIBILITY
   ========================================================================== */

.screen-reader-text {
	clip: rect(1px, 1px, 1px, 1px);
	clip-path: inset(50%);
	height: 1px;
	margin: -1px;
	overflow: hidden;
	padding: 0;
	position: absolute;
	width: 1px;
	word-wrap: normal !important;
}

.screen-reader-text:focus {
	background-color: var(--color-surface);
	clip: auto !important;
	clip-path: none;
	color: var(--color-primary);
	display: block;
	font-size: var(--font-size-sm);
	font-weight: var(--font-weight-bold);
	height: auto;
	left: var(--space-4);
	line-height: normal;
	padding: var(--space-3) var(--space-6);
	text-decoration: none;
	top: var(--space-4);
	width: auto;
	z-index: var(--z-modal);
	border-radius: var(--radius-md);
	box-shadow: var(--shadow-lg);
}

/* Skip link */
.skip-link {
	position: absolute;
	top: -100px;
	left: var(--space-4);
	z-index: var(--z-modal);
	background: var(--color-primary);
	color: var(--color-text-inverse);
	padding: var(--space-3) var(--space-6);
	border-radius: 0 0 var(--radius-md) var(--radius-md);
	font-weight: var(--font-weight-semibold);
	transition: top var(--transition-fast);
}

.skip-link:focus {
	top: 0;
	color: var(--color-text-inverse);
}

/* ==========================================================================
   ANIMATIONS
   ========================================================================== */

@keyframes fadeInUp {
	from {
		opacity: 0;
		transform: translateY(20px);
	}
	to {
		opacity: 1;
		transform: translateY(0);
	}
}

@keyframes fadeIn {
	from { opacity: 0; }
	to   { opacity: 1; }
}

.animate-fade-in-up {
	animation: fadeInUp 0.5s ease forwards;
}

.animate-fade-in {
	animation: fadeIn 0.4s ease forwards;
}

/* Intersection Observer reveal */
.reveal {
	opacity: 0;
	transform: translateY(24px);
	transition: opacity 0.5s ease, transform 0.5s ease;
}

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

/* ==========================================================================
   RESPONSIVE BREAKPOINTS
   ========================================================================== */

/* Tablet: ≤ 1024px */
@media (max-width: 1024px) {
	:root {
		--container-pad: 1.25rem;
	}

	h1 { font-size: var(--font-size-3xl); }
	h2 { font-size: var(--font-size-2xl); }

	.grid--4 { grid-template-columns: repeat(2, 1fr); }
	.grid--3 { grid-template-columns: repeat(2, 1fr); }
}

/* Mobile: ≤ 768px */
@media (max-width: 768px) {
	:root {
		--container-pad: 1rem;
	}

	.section {
		padding-block: var(--space-10);
	}

	h1 { font-size: var(--font-size-2xl); }
	h2 { font-size: var(--font-size-xl); }

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

	.section-heading {
		flex-direction: column;
		align-items: flex-start;
		gap: var(--space-3);
	}
}

/* Small Mobile: ≤ 480px */
@media (max-width: 480px) {
	:root {
		--container-pad: 0.875rem;
	}
}