/*
 * Yer6 Group - Modern Kurumsal Tema
 * Mobil ve tablet uyumlu
 */

:root {
	--color-primary: #0f3460;
	--color-primary-dark: #0a2647;
	--color-accent: #1e5a8a;
	--color-accent-hover: #2563eb;
	--color-text: #1e293b;
	--color-text-muted: #64748b;
	--color-bg: #f8fafc;
	--color-bg-card: #ffffff;
	--color-border: #e2e8f0;
	--font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
	--shadow-sm: 0 1px 2px rgba(15, 52, 96, 0.06);
	--shadow-md: 0 4px 12px rgba(15, 52, 96, 0.08);
	--shadow-lg: 0 10px 40px rgba(15, 52, 96, 0.12);
	--radius: 12px;
	--radius-lg: 16px;
	--header-height: 72px;
	--container-max: 1200px;
	--gap: 24px;
}

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

html {
	scroll-behavior: smooth;
}

body {
	margin: 0;
	font-family: var(--font-sans);
	font-size: 16px;
	line-height: 1.6;
	color: var(--color-text);
	background: var(--color-bg);
	-webkit-font-smoothing: antialiased;
}

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

a {
	color: var(--color-accent);
	text-decoration: none;
	transition: color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

ul {
	list-style: none;
	margin: 0;
	padding: 0;
}

/* ========== Header ========== */
.site-header {
	position: sticky;
	top: 0;
	z-index: 100;
	background: linear-gradient(135deg, #ffffff 0%, #f8fafc 50%, #f1f5f9 100%);
	box-shadow: var(--shadow-sm);
	border-bottom: 1px solid var(--color-border);
	overflow: hidden;
	backdrop-filter: blur(10px);
	-webkit-backdrop-filter: blur(10px);
}

.site-header::before {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	background: 
		radial-gradient(circle at 20% 50%, rgba(15, 52, 96, 0.03) 0%, transparent 50%),
		radial-gradient(circle at 80% 50%, rgba(30, 90, 138, 0.03) 0%, transparent 50%);
	pointer-events: none;
}

.site-header::after {
	content: '';
	position: absolute;
	bottom: 0;
	left: 0;
	right: 0;
	height: 1px;
	background: linear-gradient(90deg, 
		transparent 0%, 
		var(--color-accent) 20%, 
		var(--color-accent) 80%, 
		transparent 100%);
	opacity: 0.3;
}

.header-inner {
	max-width: var(--container-max);
	margin: 0 auto;
	padding: 20px 20px;
	display: flex;
	align-items: center;
	justify-content: center;
	min-height: var(--header-height);
	position: relative;
	z-index: 1;
}

.logo-link {
	display: inline-block;
	position: relative;
	transition: transform 0.3s ease;
}

.logo-link:hover {
	transform: translateY(-2px);
}

.logo-link:hover .logo-img {
	filter: drop-shadow(0 4px 12px rgba(15, 52, 96, 0.15));
	transform: scale(1.05);
}

.logo-img {
	max-height: 100px;
	width: auto;
	display: block;
	filter: drop-shadow(0 2px 4px rgba(15, 52, 96, 0.1));
	transition: filter 0.3s ease, transform 0.3s ease;
}

/* ========== Container ========== */
.container {
	width: 100%;
	max-width: var(--container-max);
	margin: 0 auto;
	padding-left: 20px;
	padding-right: 20px;
}

/* ========== Intro ========== */
.intro {
	padding: 48px 0 32px;
	text-align: center;
}

.intro-title {
	margin: 0 0 8px;
	font-size: clamp(1.75rem, 4vw, 2.25rem);
	font-weight: 700;
	color: var(--color-primary);
	letter-spacing: -0.02em;
}

.intro-desc {
	margin: 0;
	font-size: 1rem;
	color: var(--color-text-muted);
}

/* ========== Companies Grid ========== */
.companies {
	padding: 0 0 64px;
}

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

.company-card {
	margin: 0;
}

.company-link {
	display: block;
	height: 100%;
	background: var(--color-bg-card);
	border-radius: var(--radius-lg);
	overflow: hidden;
	box-shadow: var(--shadow-md);
	border: 1px solid var(--color-border);
	transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.company-link:hover {
	transform: translateY(-4px);
	box-shadow: var(--shadow-lg);
	border-color: var(--color-accent);
}

.company-link:focus {
	outline: 2px solid var(--color-accent);
	outline-offset: 2px;
}

.company-image-wrap {
	position: relative;
	aspect-ratio: 16 / 10;
	overflow: hidden;
	background: var(--color-border);
	display: flex;
	align-items: center;
	justify-content: center;
}

.company-image-wrap img {
	width: 100%;
	height: 100%;
	object-fit: contain;
	transition: transform 0.35s ease;
}

.company-link:hover .company-image-wrap img {
	transform: scale(1.05);
}

.company-info {
	padding: 20px 20px 24px;
}

.company-name {
	margin: 0 0 4px;
	font-size: 1.125rem;
	font-weight: 600;
	color: var(--color-text);
	transition: color 0.2s ease;
}

.company-link:hover .company-name {
	color: var(--color-accent);
}

.company-tagline {
	margin: 0;
	font-size: 0.875rem;
	color: var(--color-text-muted);
}

/* ========== Footer ========== */
.site-footer {
	background: var(--color-primary-dark);
	color: rgba(255, 255, 255, 0.85);
	padding: 40px 0 24px;
	margin-top: 24px;
}

.site-footer .container {
	text-align: center;
}

.footer-content {
	display: flex;
	flex-direction: column;
	gap: 24px;
	align-items: center;
}

.footer-contact {
	display: flex;
	flex-wrap: wrap;
	gap: 32px;
	justify-content: center;
	align-items: center;
}

.contact-item {
	display: flex;
	align-items: center;
	gap: 8px;
	font-size: 0.9375rem;
}

.contact-label {
	color: rgba(255, 255, 255, 0.7);
	font-weight: 500;
}

.contact-link {
	color: rgba(255, 255, 255, 0.95);
	text-decoration: none;
	font-weight: 500;
	transition: color 0.2s ease;
}

.contact-link:hover {
	color: #ffffff;
	text-decoration: underline;
}

.footer-text {
	margin: 0;
	font-size: 0.875rem;
	color: rgba(255, 255, 255, 0.7);
	padding-top: 16px;
	border-top: 1px solid rgba(255, 255, 255, 0.1);
	width: 100%;
}

/* ========== Tablet (768px - 1024px) ========== */
@media (max-width: 1024px) {
	.company-grid {
		grid-template-columns: repeat(2, 1fr);
		gap: 20px;
	}

	.intro {
		padding: 40px 0 28px;
	}

	.companies {
		padding-bottom: 48px;
	}
}

/* ========== Mobil (max 767px) ========== */
@media (max-width: 767px) {
	:root {
		--header-height: 64px;
	}

	.header-inner {
		padding: 12px 16px;
		min-height: var(--header-height);
	}

	.logo-img {
		max-height: 70px;
	}

	.container {
		padding-left: 16px;
		padding-right: 16px;
	}

	.intro {
		padding: 32px 0 24px;
	}

	.intro-title {
		font-size: 1.5rem;
	}

	.company-grid {
		grid-template-columns: 1fr;
		gap: 16px;
	}

	.company-link {
		/* Mobilde dokunma alanı yeterli olsun */
		min-height: 0;
	}

	.company-info {
		padding: 16px 18px 20px;
	}

	.company-name {
		font-size: 1.0625rem;
	}

	.companies {
		padding-bottom: 40px;
	}

	.site-footer {
		padding: 32px 0 20px;
	}

	.footer-content {
		gap: 20px;
	}

	.footer-contact {
		flex-direction: column;
		gap: 16px;
	}

	.contact-item {
		flex-direction: column;
		gap: 4px;
		font-size: 0.875rem;
	}

	.footer-text {
		font-size: 0.8125rem;
		padding-top: 12px;
	}
}

/* Küçük mobil (max 480px) */
@media (max-width: 480px) {
	.intro-title {
		font-size: 1.375rem;
	}
}

/* Yüksek kontrast / prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
	.company-link,
	.company-link .company-image-wrap img {
		transition: none;
	}

	.company-link:hover {
		transform: none;
	}

	.company-link:hover .company-image-wrap img {
		transform: none;
	}
}