/* =========================================================
   Fehmi Aydın — kişisel tek sayfa
   Koyu tema · tek vurgu (cyan) · sistem sans-serif · sıfır bağımlılık
   ========================================================= */

:root {
	--bg: #0b0e14;
	--bg-soft: #101623;
	--surface: #151c2a;
	--surface-2: #1b2434;
	--line: rgba(255, 255, 255, 0.09);
	--line-strong: rgba(255, 255, 255, 0.16);

	--text: #e8eef6;
	--text-soft: #b3c0d0;
	--text-mute: #7d8b9e;

	--accent: #22d3ee;
	--accent-ink: #06222a;
	--accent-soft: rgba(34, 211, 238, 0.13);
	--accent-line: rgba(34, 211, 238, 0.38);

	--radius: 16px;
	--radius-sm: 10px;

	--container: 1100px;
	--header-h: 68px;

	--ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Reset ---------- */

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

html {
	scroll-behavior: smooth;
	scroll-padding-top: calc(var(--header-h) + 24px);
	-webkit-text-size-adjust: 100%;
}

body {
	margin: 0;
	background-color: var(--bg);
	color: var(--text);
	font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
	font-size: 17px;
	line-height: 1.7;
	letter-spacing: -0.005em;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
	overflow-x: hidden;
}

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

h1,
h2,
h3,
p,
ul {
	margin: 0;
}

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

a {
	color: inherit;
	text-decoration: none;
}

button {
	font: inherit;
	color: inherit;
	background: none;
	border: 0;
	cursor: pointer;
}

/* ---------- Focus ---------- */

:focus {
	outline: none;
}

:focus-visible {
	outline: 2px solid var(--accent);
	outline-offset: 3px;
	border-radius: 6px;
}

.skip-link {
	position: absolute;
	left: 16px;
	top: -60px;
	z-index: 200;
	padding: 10px 16px;
	background: var(--accent);
	color: var(--accent-ink);
	font-weight: 600;
	border-radius: var(--radius-sm);
	transition: top 0.2s var(--ease);
}

.skip-link:focus-visible {
	top: 14px;
	outline-offset: 2px;
}

/* ---------- Layout ---------- */

.container {
	width: 100%;
	max-width: var(--container);
	margin-inline: auto;
	padding-inline: 24px;
}

.section {
	padding-block: clamp(72px, 11vw, 128px);
}

.section + .section {
	border-top: 1px solid var(--line);
}

/* ---------- Header ---------- */

.site-header {
	position: sticky;
	top: 0;
	z-index: 100;
	height: var(--header-h);
	background: rgba(11, 14, 20, 0.82);
	backdrop-filter: blur(14px);
	-webkit-backdrop-filter: blur(14px);
	border-bottom: 1px solid var(--line);
}

.header-inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 16px;
	height: 100%;
}

.header-actions {
	display: flex;
	align-items: center;
	gap: 12px;
	margin-left: auto;
}

/* Sıra: masaüstünde menüden sonra, mobilde menü butonundan önce */
.site-nav {
	order: 1;
}

.lang-switch {
	order: 2;
}

.nav-toggle {
	order: 3;
}

.brand {
	font-size: 1.05rem;
	font-weight: 650;
	letter-spacing: -0.02em;
	white-space: nowrap;
}

.brand:hover {
	color: var(--accent);
}

/* ---------- Dil anahtarı ---------- */

.lang-switch {
	display: inline-flex;
	align-items: center;
	gap: 3px;
	padding: 3px;
	border: 1px solid var(--line-strong);
	border-radius: 999px;
	flex: none;
}

.lang-btn {
	min-width: 40px;
	min-height: 32px;
	padding: 0 10px;
	border-radius: 999px;
	font-size: 0.795rem;
	font-weight: 700;
	letter-spacing: 0.06em;
	color: var(--text-mute);
	white-space: nowrap;
	transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.lang-btn:hover {
	color: var(--text);
	background: rgba(255, 255, 255, 0.07);
}

.lang-btn.is-active {
	background: var(--accent);
	color: var(--accent-ink);
}

.lang-btn.is-active:hover {
	background: #4ee0f4;
}

.site-nav ul {
	display: flex;
	align-items: center;
	gap: 6px;
}

.site-nav a {
	display: block;
	padding: 8px 14px;
	border-radius: var(--radius-sm);
	font-size: 0.935rem;
	color: var(--text-soft);
	transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.site-nav a:hover {
	color: var(--text);
	background: rgba(255, 255, 255, 0.05);
}

.nav-toggle {
	display: none;
	width: 44px;
	height: 44px;
	padding: 11px 10px;
	border: 1px solid var(--line-strong);
	border-radius: var(--radius-sm);
	flex-direction: column;
	justify-content: space-between;
	align-items: stretch;
}

.nav-toggle-bar {
	display: block;
	height: 2px;
	background: var(--text);
	border-radius: 2px;
	transition: transform 0.24s var(--ease), opacity 0.18s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
	transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
	opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
	transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Hero ---------- */

.hero {
	position: relative;
	overflow: hidden;
	padding-block: clamp(76px, 11vw, 136px);
	background:
		radial-gradient(ellipse 70% 65% at 50% -10%, rgba(34, 211, 238, 0.16), transparent 68%),
		var(--bg);
}

.hero-grid {
	position: absolute;
	inset: 0;
	background-image:
		linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
		linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
	background-size: 68px 68px;
	mask-image: radial-gradient(ellipse 90% 80% at 50% 25%, #000 0%, transparent 78%);
	-webkit-mask-image: radial-gradient(ellipse 90% 80% at 50% 25%, #000 0%, transparent 78%);
	pointer-events: none;
}

.hero-inner {
	position: relative;
	max-width: 820px;
}

.eyebrow {
	font-size: 0.78rem;
	font-weight: 650;
	letter-spacing: 0.16em;
	text-transform: uppercase;
	color: var(--accent);
}

.hero h1 {
	margin-top: 18px;
	font-size: clamp(2.75rem, 8vw, 5rem);
	line-height: 1.04;
	letter-spacing: -0.045em;
	font-weight: 700;
}

.hero h1::after {
	content: "";
	display: block;
	width: 86px;
	height: 3px;
	margin-top: 26px;
	border-radius: 3px;
	background: var(--accent);
}

.lede {
	margin-top: 28px;
	max-width: 620px;
	font-size: clamp(1.12rem, 2.4vw, 1.42rem);
	line-height: 1.62;
	color: var(--text-soft);
}

.hero-actions {
	display: flex;
	flex-wrap: wrap;
	gap: 12px;
	margin-top: 40px;
}

/* ---------- Buttons ---------- */

.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	min-height: 48px;
	padding: 12px 26px;
	border-radius: 999px;
	font-size: 0.985rem;
	font-weight: 600;
	letter-spacing: -0.01em;
	border: 1px solid transparent;
	transition: transform 0.18s var(--ease), background-color 0.18s var(--ease),
		border-color 0.18s var(--ease), color 0.18s var(--ease);
}

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

.btn-primary {
	background: var(--accent);
	color: var(--accent-ink);
}

.btn-primary:hover {
	background: #4ee0f4;
}

.btn-ghost {
	border-color: var(--line-strong);
	color: var(--text);
}

.btn-ghost:hover {
	border-color: var(--accent-line);
	color: var(--accent);
}

/* ---------- Section headings ---------- */

.section-title {
	max-width: 22ch;
	font-size: clamp(1.65rem, 3.6vw, 2.35rem);
	line-height: 1.2;
	letter-spacing: -0.032em;
	font-weight: 680;
}

.section-title::before {
	content: "";
	display: block;
	width: 56px;
	height: 3px;
	margin-bottom: 22px;
	border-radius: 3px;
	background: var(--accent);
}

/* ---------- Hakkında ---------- */

.prose {
	margin-top: 30px;
	max-width: 760px;
	display: grid;
	gap: 18px;
}

.prose p {
	font-size: clamp(1.05rem, 2vw, 1.24rem);
	line-height: 1.72;
	color: var(--text-soft);
}

.prose p:first-child {
	color: var(--text);
}

/* ---------- Cards ---------- */

.cards {
	margin-top: 42px;
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	gap: 18px;
}

.card {
	position: relative;
	padding: 28px 24px 26px;
	background: var(--surface);
	border: 1px solid var(--line);
	border-radius: var(--radius);
	transition: transform 0.22s var(--ease), border-color 0.22s var(--ease),
		background-color 0.22s var(--ease);
}

.card:hover {
	transform: translateY(-4px);
	background: var(--surface-2);
	border-color: var(--accent-line);
}

.card-index {
	display: block;
	font-size: 0.82rem;
	font-weight: 700;
	letter-spacing: 0.12em;
	color: var(--accent);
}

.card h3 {
	margin-top: 16px;
	font-size: 1.11rem;
	line-height: 1.35;
	letter-spacing: -0.018em;
	font-weight: 650;
}

.card p {
	margin-top: 12px;
	font-size: 0.965rem;
	line-height: 1.65;
	color: var(--text-mute);
}

/* ---------- Tags ---------- */

.tags {
	margin-top: 36px;
	display: flex;
	flex-wrap: wrap;
	gap: 12px;
}

.tag {
	padding: 10px 18px;
	background: var(--accent-soft);
	border: 1px solid var(--accent-line);
	border-radius: 999px;
	font-size: 0.945rem;
	font-weight: 550;
	color: var(--text);
	transition: background-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.tag:hover {
	background: rgba(34, 211, 238, 0.22);
	transform: translateY(-2px);
}

/* ---------- İlgi alanları ---------- */

.interests {
	margin-top: 36px;
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: 4px 40px;
	max-width: 720px;
}

.interests li {
	position: relative;
	padding: 16px 0 16px 26px;
	border-bottom: 1px solid var(--line);
	font-size: 1.06rem;
	color: var(--text-soft);
}

.interests li::before {
	content: "";
	position: absolute;
	left: 0;
	top: 50%;
	width: 8px;
	height: 8px;
	margin-top: -4px;
	border-radius: 50%;
	background: var(--accent);
}

/* ---------- İletişim ---------- */

.section-contact {
	background:
		radial-gradient(ellipse 60% 120% at 50% 130%, rgba(34, 211, 238, 0.12), transparent 70%);
}

.mail-link {
	display: inline-block;
	margin-top: 28px;
	font-size: clamp(1.35rem, 4.2vw, 2.35rem);
	font-weight: 650;
	letter-spacing: -0.028em;
	color: var(--accent);
	word-break: break-word;
	transition: color 0.18s var(--ease);
}

.mail-link:hover {
	color: #7eeaf9;
	text-decoration: underline;
	text-underline-offset: 8px;
	text-decoration-thickness: 2px;
}

/* ---------- Footer ---------- */

.site-footer {
	border-top: 1px solid var(--line);
	padding-block: 32px;
}

.site-footer p {
	font-size: 0.925rem;
	color: var(--text-mute);
	letter-spacing: -0.005em;
}

/* ---------- Responsive ---------- */

@media (max-width: 980px) {
	.cards {
		grid-template-columns: repeat(2, 1fr);
	}
}

@media (max-width: 760px) {
	.header-inner {
		gap: 10px;
	}

	.header-actions {
		gap: 8px;
	}

	.lang-btn {
		min-width: 38px;
		min-height: 38px;
		padding: 0 8px;
	}

	.nav-toggle {
		display: flex;
	}

	.site-nav {
		position: absolute;
		top: var(--header-h);
		left: 0;
		right: 0;
		background: var(--bg-soft);
		border-bottom: 1px solid var(--line);
		padding: 10px 24px 22px;
		display: none;
	}

	.site-nav.is-open {
		display: block;
	}

	.site-nav ul {
		flex-direction: column;
		align-items: stretch;
		gap: 2px;
	}

	.site-nav a {
		padding: 13px 14px;
		font-size: 1.02rem;
	}
}

@media (max-width: 380px) {
	.brand {
		font-size: 0.97rem;
	}

	.lang-btn {
		min-width: 34px;
		padding: 0 6px;
		font-size: 0.755rem;
	}
}

@media (max-width: 560px) {
	body {
		font-size: 16px;
	}

	.container {
		padding-inline: 20px;
	}

	.cards {
		grid-template-columns: 1fr;
	}

	.interests {
		grid-template-columns: 1fr;
		gap: 0;
	}

	.hero-actions .btn {
		width: 100%;
	}
}

/* ---------- Hareket azaltma ---------- */

@media (prefers-reduced-motion: reduce) {
	html {
		scroll-behavior: auto;
	}

	*,
	*::before,
	*::after {
		animation-duration: 0.01ms !important;
		animation-iteration-count: 1 !important;
		transition-duration: 0.01ms !important;
	}

	.btn:hover,
	.card:hover,
	.tag:hover {
		transform: none;
	}
}