@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@700;800&family=DM+Sans:wght@400;500;700&display=swap');
/*Reference https://www.w3schools.com/css/css_font_google.asp*/

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

main {
	max-width: 1120px;
	margin: 0 auto;
	padding-top: 0;
	position: relative;
}

body {
	background:  linear-gradient(
    135deg,
    #0a2a43 0%,   
    #0b4f3c 35%,  
    #1aa87a 70%,  
    #9fffe8 100%
);
	background-attachment: fixed;
	color: #111111;
	font-family: 'DM Sans', sans-serif;
	min-height: 100vh;
	
}

 /* 모든 리스트 텍스트 크기와 자간 통일 */
li {
	font-size: 14px;
	line-height: 1.7;
	letter-spacing: 0.01em;
	color: #53656d;
}

/*하이퍼링크 밑줄 안생기게 하기*/
a {
	text-decoration: none; 
}

/*  ■■■■■■■■■■■■■■■ About Section ■■■■■■■■■■■■■■■ */
.navbar {
	padding: 72px 5% 52px;
	position: fixed;        /* 스크롤해도 상단 고정  */
	top: 0;                 /* 화면 최상단에 배치  */
	width: min(100%, 1600px); 
	left: 50%;
	transform: translateX(-50%); 
	display: flex;          /* 자식 요소 가로 배치 */
	justify-content: space-between; /* 로고와 메뉴 양 끝 정렬 */
	align-items: center;    /* 수직 가운데 정렬 / Vertically centers all items */
	padding: 12px 5%;      
	background: rgba(255, 255, 255, 0.9); 
	backdrop-filter: blur(18px) saturate(180%);          /* 배경 블러+채도 효과 (유리느낌)  */
	-webkit-backdrop-filter: blur(18px) saturate(180%);  /* Safari 호환 블러 처리  */
	border-bottom: 1px solid rgba(160, 200, 205, 0.5);   /* 하단 연한 민트 구분선*/
	box-shadow: 0 2px 24px rgba(80, 160, 165, 0.1);      /* 아래 방향 민트 그림자  */
	z-index: 20000;         
}

@media (min-width: 1024px) { /* <-- 해상도에 따른 레이아웃 설정*/
  .navbar {
    padding-left: 13%; 
    padding-right: 13%; 
  }
}

.navbar {
	width: min(100%, 1120px);
	min-height: 72px;
	padding: 0 clamp(28px, 6vw, 120px);
}

/*  ■■■■■■■■■■■■■■■ Logo ■■■■■■■■■■■■■■■ */


/*Logo 사용중지*/
/*.logo {
	display: flex;
	align-items: center;
	gap: 8px;
	width: 160px;
}

.logo img {
	max-width: 100%;
	height: auto;
}
*/

.title {
	font-weight: 700; /*폰트 강조 or bold*/
	font-size: 20px;
	color: #111111;
	letter-spacing: 0;
	text-shadow: none;
}

.nav-links {
	display: flex;
	align-items: center;
	gap: 8px;
}

.nav-links a {
	position: relative; /* 가상 요소(::after) 위치 기준점 설정 */
	color: #333333; 
	font-weight: 500; 
	font-size: 16px; 
	padding: 10px 14px; 
	letter-spacing: 0; /* 글자 간격 기본값 / Default letter spacing */
	transition: color 0.2s; /* hover 시 색상 부드럽게 변화 */
}


.nav-links a::after {
	content: "";
	position: absolute;
	left: 14px;
	bottom: 6px;
	width: calc(100% - 28px);
	height: 2px;
	background: linear-gradient(90deg, #111111, #555555);
	transform: scaleX(0);
	transform-origin: left;
	transition: transform 0.3s ease;
}

.nav-links a:hover {
	color: #111111;
	text-shadow: none;
}

.nav-links a:hover::after {
	transform: scaleX(1);
}

.theme-toggle-link { 
	display: flex;
	align-items: center;
	padding: 0;
}


/*  ■■■■■■■■■■■■■■■ Toggle button(Dark) ■■■■■■■■■■■■■■■ */

.theme-toggle { 
	display: inline-flex;
	align-items: center;
	justify-content: center;
	appearance: none;
	-webkit-appearance: none;
	border: 1px solid rgba(0, 0, 0, 0.15);
	background: rgba(255, 255, 255, 0.7);
	color: #111111;
	padding: 8px 14px;
	border-radius: 999px;
	cursor: pointer;
	font-family: 'DM Sans', sans-serif;
	font-size: 14px;
	font-weight: 600;
	line-height: 1;
	white-space: nowrap;
	transition: transform 0.25s ease, color 0.25s ease, background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.theme-toggle::after { /*  다크모드 버튼 아래 밑줄 효과 제거 */
	content: none;
}

.theme-toggle-link::after { /* 버튼을 감싼 링크의 밑줄 제거 has 특정조건*/
	content: none;
}

.theme-toggle-link:hover::after { /* 롤오버에도 밑줄 안 나오게 유지 */
	content: none;
}

.theme-toggle:hover { /* 데스크톱 버튼 롤오버 복구 */
	color: #edf3f7;
	background: #18242b;
	border-color: rgba(160, 185, 198, 0.32);
	box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
	transform: translateY(-1px);
}

/* ============================================================
HAMBURGER MENU
Reference: https://www.w3schools.com/bootstrap//tryit.asp?filename=trybs_ref_glyph_menu-hamburger&stacked=h
   ============================================================ */
.menu-toggle { 
	display: none; /* 기본적으로 버튼 숨김 / Hide the button by default <-- 초기화면에선 무조건 숨겨야함*/ 
	border: none; 
	background: none;
	font-size: 25px; /* 햄버거 아이콘 크기  */
	cursor: pointer; /* 마우스 올리면 클릭 커서 표시  */
	color: #111111; 
}


@media (max-width: 720px) { 
.menu-toggle { /* 모바일에서 햄버거 버튼 보이기 */
    display: block;
  }

.nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: center; 
    background: rgba(220, 238, 240, 0.95);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.32s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
    border-top: 0;
    border-bottom: 0;
    box-shadow: none;
  }

 .nav-links.open {
    max-height: 420px; 
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
    border-top: 1px solid rgba(80, 160, 165, 0.3);
    border-bottom: 1px solid rgba(80, 160, 165, 0.2);
    box-shadow: 0 8px 32px rgba(60, 140, 145, 0.12);
  }

 .nav-links.open a {
    opacity: 0;
    transform: translateX(-20px);
    animation: slideIn 0.35s ease forwards;
    color: #111111;
    text-align: center;
    border-bottom: 1px solid rgba(80, 160, 165, 0.15);
  }
  

.theme-toggle {
	border: 1px solid rgba(0, 0, 0, 0.15);
	background: rgba(255, 255, 255, 0.7);
	color: #111111;
	padding: 8px 14px;
	border-radius: 999px;
	cursor: pointer;
	font-size: 14px;
	transition: transform 0.25s ease, color 0.25s ease, background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.theme-toggle::after { /* 다크모드 버튼 아래 밑줄 효과 제거 */
	content: none;
}

.theme-toggle-link::after { /* 버튼을 감싼 링크의 밑줄 제거 */
	content: none;
}

.theme-toggle-link:hover::after { /* 롤오버에도 밑줄 안 나오게 유지 */
	content: none;
}

.theme-toggle:hover {
	color: #edf3f7;
	background: #18242b;
	border-color: rgba(160, 185, 198, 0.32);
	box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
	transform: translateY(-1px);
}

@media (max-width: 720px) {
  .nav-links .theme-toggle {
    display: block; /* 모바일 메뉴 맨 아래 버튼 확실히 보이기 */
    width: calc(100% - 32px);
    margin: 14px 16px 18px;
    padding: 12px 16px;
    order: 99;
    align-self: stretch;
    justify-content: center;
    background: #111111;
    color: #edf3f7;
    border-color: rgba(80, 160, 165, 0.2);
  }
}



/* 모바일 모드에서 모든 메뉴 순차적으로 나오는 에니메이션 효과*/
.nav-links.open a:nth-child(1) { animation-delay: 0.10s; }
.nav-links.open a:nth-child(2) { animation-delay: 0.15s; }
.nav-links.open a:nth-child(3) { animation-delay: 0.20s; }
.nav-links.open a:nth-child(4) { animation-delay: 0.25s; }
.nav-links.open a:nth-child(5) { animation-delay: 0.30s; }
.nav-links.open a:nth-child(6) { animation-delay: 0.35s; }

.theme-toggle-link { /*다크모드 버튼 감싸는 링크를 모바일에서 별도 줄로 배치 */
    display: block;
    width: 100%;
    padding: 0;
    order: 99;
}

.nav-links.open .theme-toggle-link { /* 버튼 래퍼는 일반 링크 애니메이션에서 제외 */
    opacity: 1;
    transform: none;
    animation: none;
    border-bottom: 0;
  }
}

/* ============================================================
   SECTION - 각 페이지마다 색깔을 다르게 하기위해 분할 섹션
   ============================================================ */
.section {
	min-height: auto; 
	padding: 72px 5% 52px;
	scroll-margin-top: 70px;
	border-bottom: none;
	box-shadow: none;
}

@media (min-width: 1024px) {
  .section {
    padding: 56px 13% 44px; 
  }
}



.section {
	padding: 40px clamp(28px, 6vw, 120px) 60px;
	scroll-margin-top: 74px;
	position: relative;
}

.section::after {
	content: "";
	position: absolute;
	left: 0;
	right: 0;
	bottom: 0;
	height: 1px;
	background: rgba(120, 145, 155, 0.24);
}

/* 각 섹션 배경은 여기서 개별 수정 */

/* About Section */
.about-section {
	padding-top: 114px;
	background: rgba(246, 251, 252, 0.99);
}

/* Skill Section*/
.skills-section {
	background: rgba(236, 246, 248, 0.9);
}

/* Education Section*/
.education-section {
	background: rgba(232, 242, 246, 0.99);
}

/* Project Section*/
.project-section {
	background: rgba(239, 247, 244, 0.99);
}

/* Experience Section */
.experience-section {
	background: rgba(243, 247, 241, 0.99);
}

/* Contact Section */
.contact-section {
	background: rgba(246, 251, 252, 0.99);
}

.section-title {
	font-size: 40px;
	font-family: 'Playfair Display', serif;
	font-weight: 800;
	color: #111111;
	letter-spacing: 1px;
	margin-bottom: 24px;
	text-transform: uppercase;
}

.section-title::before { 
	content: '#';
	color: #155DFC;
	opacity: 1;
	font-weight: 1800;
}


   
/*  ■■■■■■■■■■■■■■■ About Page ■■■■■■■■■■■■■■■ */
/* Reference: https://www.w3schools.com/css/css_grid_container.asp*/

.about-introduce h2 {
	font-size: 110px;
	color: black;
	line-height: 0.8;
}

.about-grid {
	display: flex;
	/* align-items: center; */
}

@media (max-width: 900px) {
	.about-grid {
		flex-direction: column;
		align-items: stretch;
	}

	.about-grid-right {
		align-items: center;   /*모바일에서만 가운데 정렬*/
	}
}

.about-grid-left {
	flex: 1;
}

.about-grid-right {
	flex: 1;
	display: flex;
	flex-direction: column;
	align-items: flex-end;
}

.about-grid-portrait img {
	display: block;
	width: 400px;
	height: auto;
}

.about-paragraph {
	margin: 10px 0px;
}

.about-grid-left p {
  font-size: 16px;
}


.about-icon-list {
	display: flex;
	padding-top:30px;
	justify-content: flex-start;
	gap: 18px;
	line-height: 0;
}

.about-icon-list-individual {
	flex:1;
}

.about-icon-list-individual i {
	padding: 0px 4px;
}

/*어바웃 아이콘 세팅*/

.point-hover-linkdin {
	font-size: 33px; 
	color: #008debff;
	display: inline-block; /* 마우스 롤 오보 되었을시, 커질때 흔들리는걸 방지 하려고 했는데 잘되는지 모르겠음 */
	transition: transform 0.3s ease,  color 0.3s ease;
}

.point-hover-linkdin:hover {
	font-size: 33px; 
	color: #eb0086ff;
	transform: translateY(0) scale(1.06);
	transition: transform 0.3s ease, border-color 0.3s ease;
}

.point-hover-insta {
	font-size: 33px; 
	color: #008debff;
	display: inline-block; 
	transition: transform 0.3s ease,  color 0.3s ease;
}

.point-hover-insta:hover {
	font-size: 33px; 
	color: #eb0086ff;
	transform: translateY(0) scale(1.06);
	transition: transform 0.3s ease, border-color 0.3s ease;
}

.point-hover-fa {
	font-size: 33px;
	color: #008debff;
	display: inline-block; 
	transition: transform 0.3s ease,  color 0.3s ease;
}

.point-hover-fa:hover {
	color: #eb0086ff;
	transform: scale(1.06);
	display: inline-block; 
	transition: transform 0.3s ease,  color 0.3s ease;
}

/* Accordion about panel */

.about-exp-bullets span::before {
	content: '▸';
	color: #27C93F;
	flex-shrink: 0;
	margin-right: 6px;
}


.accordion-about {
	
	background-color: transparent;
	cursor: pointer;
	padding: 10px 3px;;
	width: 100%;
	text-align: left;
	border: none;
	outline: none;
	transition: 0.4s;
	font-weight:2000;
}

.accordion-about:hover {
	
	box-shadow: none;
	font-weight: 4000;
}


.accordion-about-panel {
	display: flex;
	float: left;
	align-items: center;
}


.accordion-about-panel-title {
	flex: 1;
	padding-left: 12px;
	font-weight: 200;
	font-size: 15px;
	color: #3b555c;
}




/*  ■■■■■■■■■■■■■■■ Skills Page ■■■■■■■■■■■■■■■ */
/*  Reference: https://www.w3schools.com/howto/howto_js_progressbar.asp
   ============================================================ */
   
.skills-wrap {
	width: 100%;
	padding: 25px 40px;
	border-radius: 13px;
	border: 1px solid rgba(0, 0, 0, 0.15);
	background: rgba(255, 255, 255, 0.75);
	backdrop-filter: blur(12px);
}

.skills-subtitle {
	margin-bottom: 40px;
	color: #5c6f91;
}

.skill-item {
	margin-bottom: 30px;
}

.skill-top {
	display: flex;
	justify-content: start;
	align-items: center;
	margin-bottom: 5px;
}

.skill-name {
	padding: 0px 10px;
	font-size: 22px;
	font-weight: 700;
	color: #1f2a44;
}

.skill-score {
	margin-left: auto;
	font-weight: 600;
	color: #5c6f91;
}

.skill-desc {
	font-size: 16px;
	color: #53656d;
	margin-bottom: 8px;
}

.progress-bar {
	height: 15px;
	background: rgba(180, 200, 230, 0.3);
	border-radius: 999px;
	overflow: hidden;
}

.progress-fill {
	height: 100%;
	border-radius: 999px;
}


.cskill { width: 70%; background: linear-gradient(90deg, #ffd36b); }
.team { width: 90%; background: linear-gradient(90deg,  #ffd36b); }
.html { width: 60%; background: linear-gradient(90deg,#ff7b54,#ff9b71); }
.CSS { width: 50%; background: linear-gradient(90deg,#ff7b54,#ff9b71); }
.JS { width: 20%; background: linear-gradient(90deg,#ff7b54,#ff9b71); }
.python { width: 30%; background: linear-gradient(90deg,#3a86ff,#5fa8ff); }
.excel { width: 70%; background: linear-gradient(90deg,#118ab2,#3bb0d6); }
.ppt { width: 50%; background: linear-gradient(90deg,#118ab2,#3bb0d6); }

@media (max-width:768px){
  .skills-wrap {
    padding: 30px 20px;
  }
}

/*  ■■■■■■■■■■■■■■■ About Page ■■■■■■■■■■■■■■■ */
/*  Reference: https://www.w3schools.com/css/css_grid.asp
   ============================================================ */
   /*원래는 Skill 쪽에 쓸려고 했으나, Education에 더 적합해서 변경
   "I originally planned to include it under Skills, but it fits better under Education, so I moved it.*/
   
.skills-grid {
	display: grid; /* 그리드 레이아웃 사용 / Use CSS Grid layout */
	grid-template-columns: repeat(3, 1fr); /* 3개의 동일한 너비 컬럼 생성 / Create 3 equal-width columns */
	gap: 16px; /* 아이템 간 간격 16px / 16px spacing between grid items */
}

@media (max-width: 900px) {
  .skills-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 500px) {
  .skills-grid {
    grid-template-columns: 1fr;
  }
}

.skill-card {
	display: flex;
	flex-direction: column;
	background: rgba(255, 255, 255, 0.95);
	border: 1px solid rgba(0, 0, 0, 0.15);
	border-radius: 12px;
	padding: 24px;
	position: relative;
	overflow: hidden;
	z-index: 9998;
}

.skill-card:hover {
	transition: transform 0.1s ease, border-color 0.2s ease, box-shadow 0.2s ease;
	transform: translateY(0) scale(1.03);
	border-color: rgba(0, 0, 0, 0.5);
	box-shadow: 0 0 16px rgba(0, 0, 0, 0.1);
	z-index: 9998;
}

.skill-card > * {
	position: relative;
	z-index: 1;
}

.skill-card-classN {
	color: #555555;
	font-size: 12px;
}

.card-title {
	color: #555555;
	font-size: 16px;
	letter-spacing: 2px;
	margin-bottom: 16px;
}

.card-title-content {
	
	margin-bottom: 16px;
}

/*Main course-card // Flip Card*/
/* Reference: https://www.w3schools.com/howto/howto_css_flip_card.asp?utm_source=chatgpt.com/ */


.skill-card-course {
	background-color: transparent;
	min-height: 320px;
	perspective: 1000px;
	overflow: visible;
	position: relative;
}

.skill-card-course-inner {
	position: relative;
	width: 100%;
	height: 100%;
	min-height: 320px;
	transition: transform 0.8s;
	transform-style: preserve-3d;
	overflow: visible;
}

.skill-card-course:hover .skill-card-course-inner {
	transform: rotateY(180deg);
}

.skill-card-course:hover { /*스킬카드 네비바 간섭생겨서 z-index 넣음*/
	z-index: 10000;
}

.skill-card-course-front,
.skill-card-course-back {
	position: absolute;
	inset: 0;
	display: flex;
	flex-direction: column;
	justify-content: space-between;
	padding: 24px;
	background-color: rgba(255, 255, 255, 0.92);
	border: 1px solid rgba(0, 0, 0, 0.15);
	border-radius: 12px;
	-webkit-backface-visibility: hidden;
	backface-visibility: hidden;
	z-index: 9998;
	overflow: visible;
}

.skill-card-course-back {
	background: linear-gradient(160deg, #1a2a31 0%, #243942 100%);
	border-color: rgba(20, 33, 39, 0.5);
	transform: rotateY(180deg);
}

.skill-card-course-back .card-title-course,
.skill-card-course-back .card-title-course-content p {
	color: #edf4f7;
}

.card-title-course-evidence {
	width:100%;
	max-height: 100%;
	overflow: hidden;
}

.card-title-course-evidence img {
	width: 100%;
	height: auto;
	display: block;
	cursor: pointer;
}

.evidence-modal {
	display: none;
	position: fixed;
	z-index: 20001;
	padding-top: 100px;
	left: 0;
	top: 0;
	width: 100%;
	height: 100%;
	overflow: auto;
	background-color: rgba(0, 0, 0, 0.9);
}

.evidence-modal-content {
	margin: auto;
	display: block;
	width: 80%;
	max-width: 900px;
	animation-name: zoom;
	animation-duration: 0.6s;
}

.evidence-modal-caption {
	margin: auto;
	display: block;
	width: 80%;
	max-width: 700px;
	text-align: center;
	color: #cccccc;
	padding: 10px 0;
	height: 150px;
}

.evidence-modal-close {
	position: absolute;
	top: 15px;
	right: 35px;
	color: #f1f1f1;
	font-size: 40px;
	font-weight: bold;
	transition: 0.3s;
	cursor: pointer;
}

.evidence-modal-close:hover,
.evidence-modal-close:focus {
	color: #bbbbbb;
	text-decoration: none;
}

@keyframes zoom {
	from {transform: scale(0)}
	to {transform: scale(1)}
}

@media (max-width: 900px) {
  .card-title-course-evidence img {
	cursor: pointer;
  }

  .evidence-modal-content {
	width: 100%;
  }
}

.card-title-course {
	color: #555555;
	font-size: 16px;
	letter-spacing: 2px;
	margin-bottom: 16px;
}

.card-title-course-content {
	
	margin-bottom: 16px;
}


.skill-card-course-back .tag {
	background: rgba(255, 255, 255, 0.1);
	border-color: rgba(255, 255, 255, 0.18);
	color: #edf4f7;
}

@media (max-width: 500px) {
	.skill-card-course-front,
	.skill-card-course-back {
		min-height: 280px;
	}
}



.tag-list {
	display: flex;
	flex-wrap: wrap;
	gap: 8px;
	flex: 1;
	align-content: flex-end; /* 태그들을 카드 아래쪽에 정렬 */
}

.tag-list p {
	width: 100%;
	margin-bottom: auto; /* 설명 문단과 태그를 위아래로 분리 */
	font-size: 16px;
}

.tag { /*작은 태그 상자 꾸미기*/
	border: 1px solid rgba(0, 0, 0, 0.15);
	background: rgba(0, 0, 0, 0.03);
	border-radius: 8px;
	padding: 6px 14px;
	font-size: 14px;
	line-height: 1.6;
	letter-spacing: 0.01em;
	color: #222;
	font-weight: 400;
	display: inline-block;
	transition: all 0.25s ease;
	backdrop-filter: blur(4px);
}

.tag:hover {
	background: rgba(0, 0, 0, 0.08);
	border-color: rgba(0, 0, 0, 0.25);
	transform: translateY(-2px);
}

.exp-grid {
	display: grid;
	grid-template-columns: 1fr 1fr; /* 2열 */
	gap: 40px 60px;
	background: #ffffff;
	padding: 60px;
}

.exp-sentence {
	border-left: 2px solid #c8a96e; /* 왼쪽 골드 선 */
	padding-left: 20px;
}

.exp-sentence span {
	color: black;
	font-size: 16px;
	line-height: 1.6;
}
   
   
.exp-shape {
	width: 100%;
	background: #e8f3f5;
	/*border-radius: 14px; */ 
	border-bottom-left-radius: 14px;
	border-bottom-right-radius: 14px;  
	border: 1px solid rgba(0, 0, 0, 0.12);
	overflow: hidden;
	transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.exp-shape:hover {
	transform: translateY(-4px);
}

.exp-box-section {
	display: flex;
	gap: 30px;
	align-items: center;
	width: 100%;
	margin: 0 auto;
}

@media (max-width: 768px) {
  .exp-box-section {
    flex-direction: column;
    gap: 5px;
  }
}

.exp-box-left {
	flex: 1;
	padding: 0;
	margin-left: auto;
}

@media (max-width: 768px) {
  .exp-box-left {
    margin-top: 20px;
  }
}

.exp-box-left-text {
	padding: 5px;
  font-size: 16px;
}

.exp-box-right {
	flex: 1;
	display: flex;
	padding: 15px 5px;
}

.exp-box-right-image {
	display: block;
	margin-left: auto;
	width: 100%;
	height: auto;
	max-width: 400px;
	border-radius: 15px;
	cursor: pointer;
}

.exp-bullets {
	list-style: none;
	padding-top: 20px;
	padding-left: 10px;
}

.exp-bullets li {
	font-size: 14px;
	color: #53656d;
	line-height: 1.7;
	letter-spacing: 0.01em;
	padding-bottom: 10px;
	display: flex;
}

.exp-bullets li::before {
	content: '▸';
	color: #27C93F;
	flex-shrink: 0;
	margin-right: 6px;
}

/* ============================================================
   KEYFRAME ANIMATIONS
   Reference: https://www.w3schools.com/tools/tool_css_animation.php
   ============================================================ */
@keyframes slideIn {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/*  ■■■■■■■■■■■■■■■ Experience Page ■■■■■■■■■■■■■■■ */
/*  Reference: https://www.w3schools.com/howto/howto_js_accordion.asp= */


.panel {
	max-height: 0;
	overflow: hidden;
	background-color: rgba(255, 255, 255, 0.65);
	transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  
}

/* padding은 inner div에 고정 → panel의 padding 변화로 인한 끊김 방지 */
.panel-inner {
	padding: 20px 30px;
}

.accordion {
	background-color: rgba(255, 255, 255, 0.75);
	color: #2f4f57;
	cursor: pointer;
	padding: 18px;
	width: 100%;
	text-align: left;
	border: none;
	outline: none;
	transition: 0.4s;
}

.accordion:hover {
	background-color: rgba(188, 224, 230, 0.92);
	box-shadow: inset 0 0 0 999px rgba(188, 224, 230, 0.92);
}

.accordion.active {
	background-color: rgba(166, 212, 220, 0.96);
	box-shadow: inset 0 0 0 999px rgba(166, 212, 220, 0.96);
}

.accordion:after {
	content: '\02795';
	font-size: 13px;
	color: rgba(80, 110, 120, 0.7);
	background-color: transparent; 
	float: right;
	margin-left: 5px;
}

.accordion.active:after {
	content: "\2796";
}

.accordian-panel {
	display: flex;
	float: left;
	align-items: center;
}

.accordian-panel-date,
.accordian-panel-date-past {
	font-size: 10px;
	text-align: center;
	border-radius: 12px;
	padding: 4px 10px;
	font-weight: 300;
	white-space: nowrap;
	min-width: 90px;
}

.accordian-panel-date {
	background-color: rgba(120, 200, 180, 0.35);
	color: #2f6f65;
	border: 1px solid rgba(120, 200, 180, 0.45);
}

.accordian-panel-date-past {
	background-color: rgba(190, 200, 205, 0.35);
	color: #5f6f75;
	border: 1px solid rgba(190, 200, 205, 0.45);
}

.accordian-panel-title {
	flex: 1;
	padding-left: 12px;
	font-weight: 200;
	font-size: 15px;
	color: #3b555c;
}

.accordion:hover .accordian-panel-title,
.accordion.active .accordian-panel-title {
  background-color: transparent;
}

/*  ■■■■■■■■■■■■■■■ Project Page ■■■■■■■■■■■■■■■ */

.feature-header {
	
}

.feature-header h2 {
    font-size: 20px; /* ← size → font-size 로 수정 */
    display: flex;
    justify-content: center;
    align-items: center;
}

.feature-grid h3 {
    font-size: 16px; 
	margin-bottom:12px;/* ← size → font-size 로 수정 */
    display: flex;
    justify-content: center;
    align-items: center;
}


.feature-grid {
	display: flex; /*그리드를 가로로 정렬해주지만 이걸로는 모바일에서 정렬이 안됨*/
	flex-wrap: wrap; /*플렉스 랩을 해야 모바일에서 붙지 않고 아래로 내려감*/
	gap: 24px;
	padding: 10px 10px;
	transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}



.feature-card {
	flex:1;
	display: flex;
	flex-direction: column;
	border-radius: 12px;
	border: 1px solid rgba(0, 0, 0, 0.15);
	background: #ffffff;
	padding: 20px 20px;
	width: 100%;
	max-width: 500px; /* 부모 크기 제한 */
	overflow: hidden; /* 넘치는 부분 숨김 */
  
}

.feature-card-bottom {
	margin-top: auto;
}

.feature-card:hover {
	transform: translateY(0) scale(1.01);
	border-color: rgba(0, 0, 0, 0.5);
	box-shadow: 0 0 16px rgba(0, 0, 0, 0.1);
	transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

@media (max-width: 900px) {
  .feature-grid {
    flex-direction: column;
    align-items: stretch;
  }
}

.styled-video {
    width: 100%;
    height: auto;
    /* border-radius: 20px; /* 둥근 모서리 */
    /* border: 5px solid black; /* 검은색 테두리 */
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.08);
    outline: none; /* 기본 아웃라인 제거 */
}

.styled-video:hover {
    transform: scale(1.01); /* 약간 확대 */
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.feature-text {
	padding: 10px 10px;
}

.feature-text p {
  font-size: 16px;
}

.feature-icon-list {
	display: flex;
	justify-content: left; 
	align-items: center;
	justify-content: flex-end;
}

.feature-icon-individual {
	margin: 0 10px;
	display: flex;
	align-items:center;
}

.feature-icon-button {
	margin: 0 10px;
	display: flex;
	margin-left: auto;
}

.project-feature-submit-button {
	height: 40px;
	/* border: 2px solid #111111; */
	color: #ffffff;
	font-weight: bold;
	border-radius: 6px;
	background: #111111;
	padding: 0px 10px;
	box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
	transition: transform 0.25s ease, background 0.25s ease;
}

.project-feature-submit-button:hover {
	background: #333333;
	transform: translateY(-2px);
}



.pro-bullets {
	list-style: none;
	padding: 15px 15px;
	padding-left: 10px;
}

.pro-bullets li {
	font-size: 14px;
	color: #53656d;
	line-height: 1.4;
	letter-spacing: 0.01em;
	padding-left: 10px;
	padding-bottom: 10px;
	display: flex;
}

.pro-bullets li::before {
	content: '▸';
	color: #27C93F;
	flex-shrink: 0;
	margin-right: 6px;
}


.titlebar {
	background: #c8dde0;
	display: flex;
	align-items: center;
	gap: 5px;
	padding: 10px 14px;
	margin-bottom: 8px;
}

/*  ■■■■■■■■■■■■■■■ Contract Page ■■■■■■■■■■■■■■■ */

.dot {
	width: 13px;
	height: 13px;
	border-radius: 50%;
}

.dot-red {
	background: #FF5F56;
}

.dot-yellow {
	background: #FFBD2E;
}

.dot-green {
	background: #27C93F;
}

.contact-layout {
	display: flex;
	gap: 20px;
	align-items: flex-start;
	width: 100%;
	margin: 0 auto;
}

@media (max-width: 900px) {
  .contact-layout {
    flex-direction: column;
    align-items: stretch;
  }
}

.contact-left {
	flex: 1;
	font-size: 16px;
}

.contact-text {
	padding: 0 0 40px;
	font-size: 16px;
	color: #53656d;
}

.contact-right {
	flex: 1;
	background: #ffffff;
	min-width: 0;
	border-radius: 12px;
	border: 1px solid rgba(0, 0, 0, 0.15);
	overflow: hidden;
	padding: 0 0 20px;
  
}

.contact-right:hover {
	transform: translateY(-4px);
	box-shadow: 0 18px 36px rgba(80, 160, 165, 0.16);
	transition: transform 0.1s ease, border-color 0.2s ease, box-shadow 0.2s ease;

}



.contact-right form {
	padding: 0 20px;
}

.contact-box {
	color: #111111;
	font-weight: 14;
	border-radius: 6px;
	margin-top: 12px;
	padding: 5px 12px;
	transition: transform 0.25s ease, background 0.25s ease;
}

.contact-box a {
	color: #111111;
}

.contact-box:hover {
	transform: translateX(-12px);
}

.contact-right label {
	display: block;
	margin-top: 14px;
	margin-bottom: 5px;
}

.contact-right input,
.contact-right textarea {
	width: 100%;
	max-width: 100%;
}

.contact-right input {
	height: 40px;
}

.contact-right textarea {
	font-size: 18px;
	height: 140px;
	margin-bottom: 5px;
}

input,
textarea {
	padding: 10px 14px;
	box-sizing: border-box;
}

.contact-right input:focus,
input:focus,
textarea:focus {
	border-color: #aaaaaa;
	outline: none;
	background: #e8f3f5;
}

.send-button {
	width: 100%;
	height: 40px;
	border: 2px solid #111111;
	color: #ffffff;
	font-weight: 14;
	border-radius: 6px;
	background: #111111;
	margin: 0;
	padding: 5px 10px;
	box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
	transition: transform 0.25s ease, background 0.25s ease;
}

.send-button:hover {
	background: #333333;
	transform: translateY(-2px);
}

/*  ■■■■■■■■■■■■■■■ Footer ■■■■■■■■■■■■■■■ */
.copyright {
	text-align: center;	
}

/*  ■■■■■■■■■■■■■■■ About Page - Flip card ■■■■■■■■■■■■■■■ */

.panel-inner-about {
}

.skills-grid-about {
	display: grid; /* 그리드 레이아웃 사용 / Use CSS Grid layout */
	grid-template-columns: repeat(2, 1fr); /* 3개의 동일한 너비 컬럼 생성 / Create 3 equal-width columns */
	/*gap: 5px; /* 아이템 간 간격 16px / 16px spacing between grid items */
}
   
@media (max-width: 900px) {
  .skills-grid-about {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 500px) {
  .skills-grid-about {
    grid-template-columns: 1fr;
  }
}

.skills-grid-about {
	grid-template-columns: repeat(3, minmax(0, 1fr));
	width: 100%;
}

.interest-card {
	position: relative;
	aspect-ratio: 1 / 1;
	overflow: hidden;
	border: 1px solid rgba(0, 0, 0, 0.12);
	background: #d9e9ee;
	box-shadow: 0 10px 24px rgba(45, 86, 95, 0.8);
	transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.interest-card img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	display: block;
	transition: transform 0.45s ease, filter 0.45s ease;
}

.interest-card-overlay {
	position: absolute;
	inset: 0;
	display: flex;
	flex-direction: column;
	justify-content: flex-end;
	padding: 18px;
	background: linear-gradient(180deg, rgba(23, 49, 56, 0.08) 18%, rgba(23, 49, 56, 0.82) 100%);
	color: #edf4f7;
	opacity: 0;
	transform: translateY(12px);
	transition: opacity 0.3s ease, transform 0.3s ease;
}

.interest-card-overlay h3 {
	margin: 0 0 8px;
	font-size: 18px;
	letter-spacing: 0.5px;
}

.interest-card-overlay p {
	margin: 0;
	font-size: 14px;
	line-height: 1.45;
}

.interest-card:hover {
	transform: translateY(-4px);
	border-color: rgba(60, 100, 108, 0.28);
	box-shadow: 0 18px 32px rgba(45, 86, 95, 0.16);
}

.interest-card:hover img {
	transform: scale(1.08);
	filter: brightness(0.3);
}

.interest-card:hover .interest-card-overlay {
	opacity: 1;
	transform: translateY(0);
}

@media (max-width: 900px) {
  .skills-grid-about {
	grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 500px) {
  .interest-card {
	aspect-ratio: 4 / 3;
  }

  .interest-card-overlay {
	opacity: 1;
	transform: translateY(0);
	padding: 16px;
  }

  .interest-card img {
	filter: brightness(0.82);
  }

  .interest-card-overlay h3 {
	font-size: 16px;
  }

  .interest-card-overlay p {
	font-size: 13px;
  }
}

@media (hover: none) {
  .interest-card-overlay {
	opacity: 1;
	transform: translateY(0);
  }

  .interest-card img {
	filter: brightness(0.82);
  }
}

@media (prefers-reduced-motion: reduce) {
  .interest-card,
  .interest-card img,
  .interest-card-overlay {
	transition: none;
  }
}


/*  ■■■■■■■■■■■■■■■ Darkmode ■■■■■■■■■■■■■■■ */


.theme-switcher {
	display: flex;
	align-items: center;
	gap: 8px;
	padding: 0 0 0 10px;
}

.theme-switcher input[type="radio"] {
	display: none;
}

.theme-switcher label {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	border: 1px solid rgba(0, 0, 0, 0.15);
	background: rgba(255, 255, 255, 0.7);
	color: #111111;
	padding: 8px 14px;
	border-radius: 999px;
	cursor: pointer;
	font-family: 'DM Sans', sans-serif;
	font-size: 14px;
	font-weight: 600;
	line-height: 1;
	white-space: nowrap;
	transition: transform 0.25s ease, color 0.25s ease, background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.theme-switcher label:hover {
	color: #edf3f7;
	background: #18242b;
	border-color: rgba(160, 185, 198, 0.32);
	box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
	transform: translateY(-1px);
}

.theme-switcher input[type="radio"]:checked + label {
	background: #18242b;
	color: #edf3f7;
	border-color: rgba(160, 185, 198, 0.32);
	box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

@media (max-width: 720px) {
  .theme-switcher {
    width: 100%;
    margin: 14px 0 18px;
    padding: 0 16px;
    order: 99;
    justify-content: center;
    flex-wrap: wrap;
  }

  .theme-switcher label {
    min-width: 140px;
    padding: 12px 16px;
  }

  .nav-links.open .theme-switcher {
    opacity: 1;
    transform: none;
    animation: none;
  }
}