$(document).ready(function(){
	Splitting();
	topScroll();

	$(".top_btn, .back_btn").css("display", "block"); // 항상 표시

	$("#bg,.close_btn").click(function(){
		$(".popup,#bg").hide();
	});
});

function topScroll(){
	$(".top_btn").click(function(){
		$("html, body").animate({scrollTop: 0}, 300);
	});

	$(".back_btn").click(function(){
		window.history.back();
	});

	$(".scroll_btn").click(function(){
		const $mainTop = $(".sub_all").offset().top - 40;
		$("html, body").animate({scrollTop: $mainTop}, 300);
	});

	$(window).on('scroll', function(){
		checkOffset(); // 항상 offset만 체크
	});

	checkOffset(); // 초기에도 실행
}

function checkOffset() {
	const pageHeight = $(document).height();
	const winHeight = $(window).height();
	const footerHeight = $('footer').outerHeight() || 0;
	const scrollTop = $(window).scrollTop();

	const maxScroll = pageHeight - winHeight;
	const nearFooter = scrollTop > (maxScroll - footerHeight);

	if (nearFooter) {
		// 푸터에 닿을 때는 bottom 위치를 footer 위에 부드럽게 조정
		const offset = 20;
		$(".top_btn").css({ position: "absolute", bottom: footerHeight + offset + "px" });
		$(".back_btn").css({ position: "absolute", bottom: footerHeight + offset + 60 + "px" });
	} else {
				// 평소에는 fixed로 고정
		$(".top_btn").css({ position: "fixed", bottom: "40px" });
		$(".back_btn").css({ position: "fixed", bottom: "100px" });
	}
}