/* ============================================
   LAYOUT SYSTEM
   Containers, Grid, Responsive Utilities
   ============================================ */

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

html {
	scroll-behavior: smooth;
}

body {
	margin: 0;
	padding: 0;
}

/* Skip Link */
.skip-link {
	display: none;
}

/* Container System */
.container {
	width: 100%;
	max-width: var(--container-2xl);
	margin: 0 auto;
	padding: 0 var(--space-xl);
}

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

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

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

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

/* Section Base */
.section {
	padding: var(--space-4xl) 0;
	position: relative;
}

/* Header */
.header {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	z-index: var(--z-fixed);
	background: rgba(10, 10, 15, 0.8);
	backdrop-filter: blur(20px);
	border-bottom: 1px solid var(--color-border-muted);
	transition: all var(--transition-base);
}

.nav {
	padding: var(--space-md) 0;
}

.nav-container {
	display: flex;
	align-items: center;
	justify-content: space-between;
	max-width: var(--container-2xl);
	margin: 0 auto;
	padding: 0 var(--space-xl);
}

.nav-logo {
	display: flex;
	align-items: center;
	gap: var(--space-sm);
	font-size: var(--font-size-lg);
	font-weight: var(--font-weight-bold);
	color: var(--color-text-primary);
	text-decoration: none;
	transition: opacity var(--transition-base);
}

.nav-logo:hover {
	opacity: 0.8;
}

.logo-image {
	height: 40px;
	width: auto;
}

.nav-list {
	display: flex;
	align-items: center;
	gap: var(--space-xl);
	list-style: none;
	margin: 0;
	padding: 0;
}

.nav-link {
	color: var(--color-text-secondary);
	text-decoration: none;
	font-weight: var(--font-weight-medium);
	transition: color var(--transition-base);
	position: relative;
}

.nav-link::after {
	content: '';
	position: absolute;
	bottom: -4px;
	left: 0;
	width: 0;
	height: 2px;
	background: var(--color-primary);
	transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link:focus {
	color: var(--color-primary);
}

.nav-link:hover::after,
.nav-link:focus::after {
	width: 100%;
}

.nav-link.active {
	color: var(--color-primary);
}

.nav-link.active::after {
	width: 100%;
}

/* Main Content */
.main {
	padding-top: 80px;
}

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

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

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

.grid-auto {
	grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

/* Flex Utilities */
.flex {
	display: flex;
}

.flex-col {
	flex-direction: column;
}

.items-center {
	align-items: center;
}

.justify-center {
	justify-content: center;
}

.justify-between {
	justify-content: space-between;
}

.gap-sm {
	gap: var(--space-sm);
}

.gap-md {
	gap: var(--space-md);
}

.gap-lg {
	gap: var(--space-lg);
}

.gap-xl {
	gap: var(--space-xl);
}

/* Responsive Breakpoints */
@media (max-width: 1024px) {
	.container {
		padding: 0 var(--space-lg);
	}
	
	.nav-container {
		padding: 0 var(--space-lg);
	}
}

@media (max-width: 768px) {
	.container {
		padding: 0 var(--space-md);
	}
	
	.nav-container {
		padding: 0 var(--space-md);
		flex-direction: column;
		gap: var(--space-md);
	}
	
	.nav-list {
		flex-wrap: wrap;
		justify-content: center;
		gap: var(--space-md);
	}
	
	.section {
		padding: var(--space-3xl) 0;
	}
	
	.grid-2,
	.grid-3 {
		grid-template-columns: 1fr;
	}
}

@media (max-width: 480px) {
	.container {
		padding: 0 var(--space-sm);
	}
	
	.nav-container {
		padding: 0 var(--space-sm);
	}
	
	.section {
		padding: var(--space-2xl) 0;
	}
}