/**
 * BK Scroll Sequence — frontend stilleri.
 *
 * Tüm sınıflar "bkss-" ön ekiyle korunur; global çakışma oluşmaz.
 * Tema uyumu için tüm değişkenler CSS custom property olarak dışa açıktır.
 */

.bkss-sequence {
	--bkss-bg: #000;
	--bkss-h: 100vh;
	--bkss-h-sv: 100vh;
	--bkss-track: 500vh;
	--bkss-loader-bg: #000;
	--bkss-loader-color: #fff;
	--bkss-fade: 400ms;
	--bkss-progress: 0;
	--bkss-ax: center;
	--bkss-ay: center;
	--bkss-ta: center;
	--bkss-lmw: 640px;
	--bkss-lcolor: #fff;

	position: relative;
	display: block;
	width: 100%;
	background-color: var(--bkss-bg);
}

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

/* ---------------------------------------------------------------- Track */

.bkss-sequence__track {
	position: relative;
	width: 100%;
	height: var(--bkss-track);
}

.bkss-sequence__sticky {
	position: -webkit-sticky;
	position: sticky;
	top: 0;
	width: 100%;
	height: var(--bkss-h);
	overflow: hidden;
	background-color: var(--bkss-bg);
	/* Layout shift'i azaltmak için alan baştan ayrılır. */
	contain: layout paint;
}

@supports (height: 100svh) {
	.bkss-sequence__sticky {
		height: var(--bkss-h-sv);
	}
}

/* Sabitleme kapalıyken normal akış. */
.bkss-sequence--unpinned .bkss-sequence__track {
	height: auto;
}

.bkss-sequence--unpinned .bkss-sequence__sticky {
	position: relative;
	top: 0 !important;
}

/* Statik / hareket azaltma modunda uzun scroll alanı oluşturma. */
.bkss-sequence--static .bkss-sequence__track,
.bkss-sequence--reduced .bkss-sequence__track,
.bkss-sequence--single .bkss-sequence__track {
	height: var(--bkss-h);
}

@supports (height: 100svh) {
	.bkss-sequence--static .bkss-sequence__track,
	.bkss-sequence--reduced .bkss-sequence__track,
	.bkss-sequence--single .bkss-sequence__track {
		height: var(--bkss-h-sv);
	}
}

.bkss-sequence--hidden {
	display: none !important;
}

/* --------------------------------------------------------------- Canvas */

.bkss-sequence__canvas {
	position: absolute;
	inset: 0;
	display: block;
	width: 100%;
	height: 100%;
	max-width: var(--bkss-maxw, none);
	max-height: var(--bkss-maxh, none);
	margin: auto;
	background-color: var(--bkss-bg);
}

.bkss-sequence--fallback .bkss-sequence__canvas {
	display: none;
}

/* --------------------------------------------------------------- Poster */

.bkss-sequence__poster {
	position: absolute;
	inset: 0;
	display: block;
	width: 100%;
	height: 100%;
	max-width: 100%;
	object-fit: cover;
	object-position: center;
	opacity: 1;
	transition: opacity 320ms ease;
	pointer-events: none;
}

.bkss-sequence--drawn .bkss-sequence__poster {
	opacity: 0;
}

.bkss-sequence--fallback .bkss-sequence__poster,
.bkss-sequence--static .bkss-sequence__poster {
	opacity: 1;
}

.bkss-sequence--static.bkss-sequence--drawn .bkss-sequence__poster {
	opacity: 0;
}

/* --------------------------------------------------------------- Loader */

.bkss-sequence__loader {
	position: absolute;
	inset: 0;
	z-index: 50;
	display: flex;
	align-items: center;
	justify-content: center;
	background-color: var(--bkss-loader-bg);
	color: var(--bkss-loader-color);
	opacity: 1;
	transition: opacity var(--bkss-fade) ease;
}

.bkss-sequence__loader.is-hidden {
	opacity: 0;
	pointer-events: none;
}

.bkss-sequence__loader-inner {
	width: min(320px, 80%);
	text-align: center;
	font-size: 14px;
	line-height: 1.5;
}

.bkss-sequence__loader-logo {
	display: block;
	max-width: 160px;
	height: auto;
	margin: 0 auto 16px;
}

.bkss-sequence__loader-text {
	margin: 0 0 12px;
	color: inherit;
}

.bkss-sequence__loader-bar {
	position: relative;
	width: 100%;
	height: 3px;
	overflow: hidden;
	background-color: rgba(127, 127, 127, 0.35);
	border-radius: 3px;
}

.bkss-sequence__progress {
	display: block;
	width: 0;
	height: 100%;
	background-color: currentColor;
	border-radius: 3px;
	transition: width 180ms linear;
}

.bkss-sequence__loader-percent {
	margin: 10px 0 0;
	font-variant-numeric: tabular-nums;
	color: inherit;
}

/* ------------------------------------------------------------- Overlays */

.bkss-sequence__overlays {
	position: absolute;
	inset: 0;
	z-index: 20;
	pointer-events: none;
}

.bkss-layer {
	position: absolute;
	inset: 0;
	display: flex;
	align-items: var(--bkss-ay);
	justify-content: var(--bkss-ax);
	padding: clamp(16px, 5vw, 64px);
	pointer-events: none;
}

/*
 * Varsayılan görünür durum: JavaScript hiç çalışmasa bile katman içeriği
 * okunabilir kalır. Gizleme yalnızca is-before / is-after durumlarında olur;
 * başlangıç durumu sunucu tarafında sınıf olarak basılır.
 */
.bkss-layer__inner {
	max-width: var(--bkss-lmw);
	text-align: var(--bkss-ta);
	color: var(--bkss-lcolor);
	pointer-events: auto;
	opacity: 1;
	transform: none;
	transition: opacity 620ms cubic-bezier(0.22, 0.61, 0.36, 1),
		transform 620ms cubic-bezier(0.22, 0.61, 0.36, 1);
	will-change: opacity, transform;
}

.bkss-layer.is-visible .bkss-layer__inner {
	opacity: 1;
	transform: none;
}

/* Görünür olmayan katmanlar tıklanabilir olmasın. */
.bkss-layer.is-before .bkss-layer__inner,
.bkss-layer.is-after .bkss-layer__inner {
	pointer-events: none;
}

.bkss-layer__title {
	margin: 0 0 0.5em;
	color: inherit;
	line-height: 1.1;
}

.bkss-layer__text,
.bkss-layer__html {
	color: inherit;
}

.bkss-layer__text p:last-child {
	margin-bottom: 0;
}

.bkss-layer__button {
	display: inline-block;
	margin-top: 1.25em;
	padding: 0.75em 1.75em;
	border: 1px solid currentColor;
	border-radius: 999px;
	color: inherit;
	text-decoration: none;
	transition: background-color 220ms ease, color 220ms ease;
}

.bkss-layer__button:hover,
.bkss-layer__button:focus {
	background-color: currentColor;
}

.bkss-layer__button:focus-visible {
	outline: 2px solid currentColor;
	outline-offset: 3px;
}

/* --- Giriş animasyonları (is-before durumu) --- */

.bkss-layer--in-none.is-before .bkss-layer__inner { opacity: 0; }
.bkss-layer--in-fade.is-before .bkss-layer__inner { opacity: 0; }
.bkss-layer--in-up.is-before .bkss-layer__inner { opacity: 0; transform: translateY(48px); }
.bkss-layer--in-down.is-before .bkss-layer__inner { opacity: 0; transform: translateY(-48px); }
.bkss-layer--in-left.is-before .bkss-layer__inner { opacity: 0; transform: translateX(-48px); }
.bkss-layer--in-right.is-before .bkss-layer__inner { opacity: 0; transform: translateX(48px); }
.bkss-layer--in-scale.is-before .bkss-layer__inner { opacity: 0; transform: scale(0.88); }

.bkss-layer--in-none.is-before .bkss-layer__inner {
	transition: none;
}

/* --- Çıkış animasyonları (is-after durumu) --- */

.bkss-layer--out-none.is-after .bkss-layer__inner { opacity: 0; transition: none; }
.bkss-layer--out-fade.is-after .bkss-layer__inner { opacity: 0; }
.bkss-layer--out-up.is-after .bkss-layer__inner { opacity: 0; transform: translateY(-48px); }
.bkss-layer--out-down.is-after .bkss-layer__inner { opacity: 0; transform: translateY(48px); }
.bkss-layer--out-left.is-after .bkss-layer__inner { opacity: 0; transform: translateX(-48px); }
.bkss-layer--out-right.is-after .bkss-layer__inner { opacity: 0; transform: translateX(48px); }
.bkss-layer--out-scale.is-after .bkss-layer__inner { opacity: 0; transform: scale(1.12); }

/* ------------------------------------------------------- Erişilebilirlik */

@media (prefers-reduced-motion: reduce) {
	.bkss-layer__inner,
	.bkss-sequence__poster,
	.bkss-sequence__loader,
	.bkss-sequence__progress {
		transition-duration: 1ms !important;
	}

	.bkss-layer .bkss-layer__inner {
		transform: none !important;
	}
}

.bkss-sequence .screen-reader-text {
	position: absolute !important;
	width: 1px;
	height: 1px;
	margin: -1px;
	padding: 0;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	clip-path: inset(50%);
	white-space: nowrap;
	border: 0;
}

/* JS henüz çalışmadıysa yükleme katmanı görünür kalır ama içerik erişilebilirdir. */
.bkss-sequence--pending .bkss-sequence__canvas {
	opacity: 0;
}