/* ==========================================
   1. CSS Variables & Design System (베이지 & 블랙 감성 테마)
   ========================================== */
:root {
  /* 색상 팔레트 (베이지와 검정의 조화로운 밤 테마) */
  --bg-primary-base: #0F0E0D;   /* 깊은 차콜 블랙 */
  --bg-secondary-base: #25201C; /* 따뜻한 웜 코코아 브라운 */
  
  /* 배경용 점진적 그라데이션 (베이지와 검정색의 자연스러운 스며듦) */
  --bg-gradient-main: linear-gradient(180deg, #0F0E0D 0%, #1F1B18 50%, #302924 100%);
  --bg-gradient-sec: linear-gradient(180deg, #302924 0%, #1F1B18 50%, #0F0E0D 100%);
  
  /* 카드 및 박스용 반투명 배경 (글래스모피즘) */
  --bg-card: rgba(37, 32, 28, 0.7);
  
  --text-primary: #FDFBF7;      /* 메인 텍스트: 따뜻한 크림 아이보리 */
  --text-secondary: #D5C7BC;    /* 서브 텍스트: 부드러운 밀크 코코아 */
  --text-light: #A39081;        /* 연한 텍스트: 차분한 토프 베이지 */
  
  /* 메인 스킨 컬러 */
  --color-beige: #DDB892;       /* 포인트 컬러: 세련된 웜 베이지 */
  --color-beige-light: #E6CCB2; /* 조금 더 밝은 크림 베이지 */
  --color-black: #0F0E0D;       /* 짙은 차콜 블랙 */
  
  /* 서브 포인트 컬러 (베이지&블랙 테마에 맞추어 저채도로 정돈) */
  --color-orange: #E6A15C;      /* 부드러운 살구 오렌지 */
  --color-green: #90A995;       /* 차분한 올리브 세이지 그린 */
  --color-blue: #93A8AC;        /* 세련된 회청색 블루 */
  
  --color-orange-light: rgba(230, 161, 92, 0.12);
  --color-green-light: rgba(144, 169, 149, 0.12);
  --color-blue-light: rgba(147, 168, 172, 0.12);
  
  --border-color: rgba(221, 184, 146, 0.12);
  --border-glow: rgba(221, 184, 146, 0.25);

  /* 타이포그래피 */
  --font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
  
  /* 그림자 & 둥글기 */
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.2), 0 2px 4px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 12px 20px -3px rgba(0, 0, 0, 0.35), 0 4px 12px -2px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 20px 40px -10px rgba(0, 0, 0, 0.45), 0 8px 24px -4px rgba(0, 0, 0, 0.35);
  --shadow-soft: 0 30px 60px rgba(0, 0, 0, 0.55);
  
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;

  /* 트랜지션 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================
   2. Reset & General Styles
   ========================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  background: var(--bg-gradient-main);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* 스크롤바 디자인 */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary-base);
}
::-webkit-scrollbar-thumb {
  background: var(--bg-secondary-base);
  border-radius: var(--radius-full);
  border: 2px solid var(--bg-primary-base);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-beige);
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-fast);
}

ul {
  list-style: none;
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================
   3. Common UI Components (Buttons, Badges)
   ========================================== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--color-orange-light);
  color: var(--color-orange);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 24px;
  border: 1px solid rgba(230, 161, 92, 0.2);
}

.badge i {
  width: 16px;
  height: 16px;
}

/* 버튼 스타일 (배경에 은은하게 밀착되며 겉돌지 않는 세련된 디자인) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 1rem;
  font-weight: 700;
  padding: 14px 28px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  border: none;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-beige);
  color: var(--color-black);
  box-shadow: 0 6px 18px rgba(221, 184, 146, 0.15);
}

.btn-primary:hover {
  background-color: var(--color-beige-light);
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(221, 184, 146, 0.3);
}

.btn-secondary {
  background-color: rgba(221, 184, 146, 0.05);
  color: var(--color-beige);
  border: 1px solid rgba(221, 184, 146, 0.3);
}

.btn-secondary:hover {
  background-color: rgba(221, 184, 146, 0.12);
  border-color: var(--color-beige);
  transform: translateY(-2px);
}

/* ==========================================
   4. Header & Navigation (글래스모피즘 헤더)
   ========================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  z-index: 100;
  background-color: rgba(15, 14, 13, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(221, 184, 146, 0.08);
  transition: all var(--transition-normal);
}

.site-header.scrolled {
  height: 70px;
  background-color: rgba(15, 14, 13, 0.95);
  box-shadow: var(--shadow-sm);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.5px;
}

.logo-icon-wrapper {
  background-color: var(--color-beige);
  color: var(--color-black);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
}

.logo-icon {
  width: 18px;
  height: 18px;
}

.logo-text {
  color: var(--text-primary);
  font-weight: 800;
  letter-spacing: 0.5px;
}

.main-nav ul {
  display: flex;
  align-items: center;
  gap: 32px;
}

.main-nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.main-nav a:hover {
  color: var(--color-beige);
}

.main-nav .nav-cta {
  background: rgba(221, 184, 146, 0.08);
  color: var(--color-beige);
  border: 1px solid rgba(221, 184, 146, 0.3);
  padding: 8px 18px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
}

.main-nav .nav-cta:hover {
  background-color: var(--color-beige);
  color: var(--color-black);
  transform: translateY(-1px);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-primary);
}

.mobile-menu-toggle i {
  width: 28px;
  height: 28px;
}

/* 모바일 메뉴 드로어 */
.mobile-menu {
  position: fixed;
  top: 0;
  right: -100%;
  width: 80%;
  max-width: 320px;
  height: 100vh;
  background-color: #171513;
  box-shadow: var(--shadow-lg);
  z-index: 200;
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 40px;
  border-left: 1px solid rgba(221, 184, 146, 0.08);
  transition: right var(--transition-normal);
}

.mobile-menu.active {
  right: 0;
}

.mobile-menu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mobile-menu-close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-primary);
}

.mobile-menu-close i {
  width: 24px;
  height: 24px;
}

.mobile-nav ul {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.mobile-nav a {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.mobile-nav .mobile-nav-cta {
  display: inline-block;
  background-color: var(--color-beige);
  color: var(--color-black);
  padding: 12px;
  border-radius: var(--radius-md);
  text-align: center;
  margin-top: 10px;
  font-weight: 700;
}

/* ==========================================
   5. Hero Section
   ========================================== */
.hero-section {
  padding: 160px 0 100px 0;
  overflow: hidden;
  position: relative;
}

/* 부드러운 코코아 그라데이션 광채 장식 */
.hero-section::before {
  content: '';
  position: absolute;
  top: 15%;
  right: -5%;
  width: 500px;
  height: 500px;
  border-radius: var(--radius-full);
  background: radial-gradient(circle, rgba(221, 184, 146, 0.07) 0%, rgba(0,0,0,0) 70%);
  z-index: -1;
  pointer-events: none;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  align-items: center;
  gap: 60px;
}

.hero-content h1 {
  font-size: 3rem;
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
  word-break: keep-all;
}

.hero-content h1 span {
  color: var(--color-beige);
  background: linear-gradient(135deg, var(--color-beige) 0%, var(--color-orange) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: block;
  font-size: 2.2rem;
  font-weight: 700;
  margin-top: 8px;
}

.hero-description {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  word-break: keep-all;
}

.hero-buttons {
  display: flex;
  gap: 16px;
}

.hero-image-wrapper {
  position: relative;
  width: 100%;
}

.hero-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(221, 184, 146, 0.12);
  transform: perspective(1000px) rotateY(-5deg) rotateX(5deg);
  transition: transform var(--transition-slow), box-shadow var(--transition-normal);
}

.hero-image-wrapper:hover .hero-img {
  transform: perspective(1000px) rotateY(0deg) rotateX(0deg);
  box-shadow: 0 20px 40px rgba(221, 184, 146, 0.1);
}

/* 히어로 장식 카드 (글래스모피즘 밀착 디자인) */
.hero-card-decoration {
  position: absolute;
  background-color: rgba(35, 30, 26, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 16px 20px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 14px;
  border: 1px solid rgba(221, 184, 146, 0.15);
}

.hero-card-decoration.card-1 {
  top: 15%;
  left: -40px;
  animation: float-y 4s ease-in-out infinite alternate;
}

.hero-card-decoration.card-2 {
  bottom: 10%;
  right: -20px;
  animation: float-y 5s ease-in-out infinite alternate-reverse;
}

.deco-icon {
  width: 24px;
  height: 24px;
  padding: 10px;
  border-radius: 12px;
}

.text-orange {
  color: var(--color-orange);
  background-color: var(--color-orange-light);
}

.text-green {
  color: var(--color-green);
  background-color: var(--color-green-light);
}

.deco-title {
  display: block;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.deco-desc {
  display: block;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

/* ==========================================
   6. Keyword Section (What is Debugging)
   ========================================== */
.keywords-section {
  padding: 100px 0;
  background: var(--bg-gradient-sec);
}

.section-header {
  text-align: center;
  max-width: 1000px; /* PC 화면에서 대제목이 끊어지지 않도록 최대 너비 확장 */
  margin: 0 auto 60px auto;
}

.section-tag {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-beige);
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 12px;
  display: block;
}

.section-header h2 {
  font-size: 3.2rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -1.5px;
  line-height: 1.25;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  word-break: keep-all;
  max-width: 600px; /* 설명 글은 가독성을 위해 600px로 폭 제한 및 중앙 정렬 */
  margin: 0 auto;
}

.keywords-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.keyword-card {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.keyword-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: transparent;
  transition: background var(--transition-normal);
}

.keyword-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(221, 184, 146, 0.25);
}

.keyword-card:nth-child(1):hover::after { background: var(--color-orange); }
.keyword-card:nth-child(2):hover::after { background: var(--color-green); }
.keyword-card:nth-child(3):hover::after { background: var(--color-blue); }

.card-icon-box {
  width: 56px;
  height: 56px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 28px;
}

.bg-light-orange { background-color: var(--color-orange-light); }
.bg-light-green { background-color: var(--color-green-light); }
.bg-light-blue { background-color: var(--color-blue-light); }

.card-icon {
  width: 28px;
  height: 28px;
}

.card-icon.text-orange { color: var(--color-orange); }
.card-icon.text-green { color: var(--color-green); }
.card-icon.text-blue { color: var(--color-blue); }

.keyword-card h3 {
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.card-def {
  font-size: 0.9rem;
  color: var(--color-orange);
  font-weight: 600;
  margin-bottom: 16px;
  background-color: var(--color-orange-light);
  border: 1px solid rgba(230, 161, 92, 0.15);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  display: inline-block;
  align-self: flex-start;
}

.keyword-card:nth-child(2) .card-def {
  color: var(--color-green);
  background-color: var(--color-green-light);
  border-color: rgba(144, 169, 149, 0.15);
}
.keyword-card:nth-child(3) .card-def {
  color: var(--color-blue);
  background-color: var(--color-blue-light);
  border-color: rgba(147, 168, 172, 0.15);
}

.card-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  flex-grow: 1;
  word-break: keep-all;
}

.card-tag {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-light);
  border-top: 1px solid rgba(221, 184, 146, 0.08);
  padding-top: 16px;
}

/* ==========================================
   7. Features (운영방향 및 차별점) Section
   ========================================== */
.features-section {
  padding: 100px 0;
  background: var(--bg-gradient-main);
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-top: 40px;
}

.feature-box {
  background-color: var(--bg-card);
  padding: 40px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.feature-box:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: rgba(221, 184, 146, 0.2);
}

.feature-box h3 {
  font-size: 1.5rem;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.feature-box h3.color-orange { color: var(--color-orange); }
.feature-box h3.color-green { color: var(--color-green); }

.feature-box ul {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.feature-box li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.feature-box li i {
  flex-shrink: 0;
  margin-top: 4px;
}

.feature-box li strong {
  display: block;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
}

.feature-box li p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 4px;
  word-break: keep-all;
}

/* ==========================================
   8. Classes (수준별 3개 반 구성) Section
   ========================================== */
.curriculum-section {
  padding: 100px 0;
  background: var(--bg-gradient-sec);
}

/* ==========================================
   9. Activities Section
   ========================================== */
.activity-section {
  padding: 100px 0;
  background: var(--bg-gradient-main);
}

.activities-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-top: 40px;
}

.activity-card {
  background-color: var(--bg-card);
  padding: 30px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.activity-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: rgba(221, 184, 146, 0.2);
}

.activity-card:nth-child(1) { border-top: 4px solid var(--color-orange); }
.activity-card:nth-child(2) { border-top: 4px solid var(--color-green); }
.activity-card:nth-child(3) { border-top: 4px solid var(--color-blue); }

.activity-card h4 {
  font-size: 1.15rem;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.activity-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  word-break: keep-all;
}

/* ==========================================
   10. FAQ Section
   ========================================== */
.faq-section {
  padding: 100px 0;
  background: var(--bg-gradient-sec);
}

.faq-container {
  max-width: 800px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 40px;
}

.faq-item {
  background-color: var(--bg-card);
  padding: 28px 32px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.faq-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: rgba(221, 184, 146, 0.2);
}

.faq-item:nth-child(1) { border-left: 4px solid var(--color-orange); }
.faq-item:nth-child(2) { border-left: 4px solid var(--color-green); }
.faq-item:nth-child(3) { border-left: 4px solid var(--color-blue); }

.faq-item h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 12px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.faq-item p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  padding-left: 20px;
  word-break: keep-all;
  line-height: 1.7;
}

/* ==========================================
   11. Apply / CTA Section (지원하기 박스)
   ========================================== */
.apply-section {
  padding: 100px 0 120px 0;
  background: var(--bg-gradient-main);
}

.apply-box {
  background: linear-gradient(135deg, #1A1613 0%, #2D2520 100%);
  border-radius: var(--radius-lg);
  padding: 70px 40px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(221, 184, 146, 0.15);
  position: relative;
  overflow: hidden;
}

.apply-box::before {
  content: '';
  position: absolute;
  top: -150px;
  left: -150px;
  width: 300px;
  height: 300px;
  border-radius: var(--radius-full);
  background-color: rgba(221, 184, 146, 0.04);
}

.apply-box::after {
  content: '';
  position: absolute;
  bottom: -150px;
  right: -150px;
  width: 300px;
  height: 300px;
  border-radius: var(--radius-full);
  background-color: rgba(144, 169, 149, 0.03);
}

.apply-icon-wrapper {
  background: linear-gradient(135deg, var(--color-beige) 0%, var(--color-orange) 100%);
  color: var(--color-black);
  width: 64px;
  height: 64px;
  border-radius: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 28px auto;
  box-shadow: 0 8px 20px rgba(221, 184, 146, 0.2);
}

.apply-icon {
  width: 30px;
  height: 30px;
}

.apply-box h2 {
  font-size: 3.2rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -1.5px;
  line-height: 1.25;
}

.apply-box p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
  word-break: keep-all;
}

.apply-info-cards {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin-bottom: 44px;
  flex-wrap: wrap;
}

.info-card {
  background-color: rgba(15, 14, 13, 0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 16px 24px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 12px;
  text-align: left;
  min-width: 240px;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(221, 184, 146, 0.08);
}

.info-card i {
  color: var(--color-beige);
  width: 22px;
  height: 22px;
}

.info-card strong {
  display: block;
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-transform: uppercase;
}

.info-card p {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* 스터디 하단 지원하기 단추 (밀착 및 고급스러운 오버레이) */
.btn-apply {
  background-color: var(--color-beige);
  color: var(--color-black);
  font-size: 1.1rem;
  padding: 16px 40px;
  box-shadow: 0 8px 24px rgba(221, 184, 146, 0.2);
}

.btn-apply:hover {
  background-color: var(--color-beige-light);
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 14px 32px rgba(221, 184, 146, 0.35);
}

/* ==========================================
   12. Footer (푸터)
   ========================================== */
.site-footer {
  background-color: #0B0A09;
  color: var(--text-secondary);
  padding: 80px 0 0 0;
  border-top: 1px solid rgba(221, 184, 146, 0.06);
}

.footer-container {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 60px;
  padding-bottom: 60px;
  border-bottom: 1px solid rgba(221, 184, 146, 0.06);
}

.footer-brand .logo {
  margin-bottom: 20px;
}

.footer-brand .logo-text {
  color: #FFFFFF;
}

.footer-brand .logo-icon-wrapper {
  background-color: var(--color-beige);
  color: var(--color-black);
}

.footer-slogan {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 320px;
}

.site-footer h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 24px;
  color: #FFFFFF;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.footer-links a:hover {
  color: var(--color-beige);
  padding-left: 4px;
}

.footer-contact p {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.footer-contact p a:hover {
  color: var(--color-beige);
}

.footer-contact i {
  width: 18px;
  height: 18px;
  color: var(--color-beige);
}

.footer-bottom {
  padding: 30px 0;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-light);
}

/* ==========================================
   13. Keyframes & Animations (애니메이션)
   ========================================== */
@keyframes float-y {
  0% { transform: translateY(0); }
  100% { transform: translateY(-12px); }
}

/* 스크롤 페이드 인 효과 */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in-up.active {
  opacity: 1;
  transform: translateY(0);
}

/* 지연 시간 딜레이 유틸리티 */
.delay-1 { transition-delay: 0.15s; }
.delay-2 { transition-delay: 0.3s; }
.delay-3 { transition-delay: 0.45s; }

/* - 유틸리티 컬러 클래스 - */
.color-orange { color: var(--color-orange); }
.color-green { color: var(--color-green); }
.color-blue { color: var(--color-blue); }
.color-beige { color: var(--color-beige); }

/* PC 화면에서는 모바일용 줄바꿈 태그를 무시 */
.mobile-only {
  display: none;
}

/* ==========================================
   14. Media Queries (Responsive 반응형)
   ========================================== */
@media (max-width: 1024px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }
  
  .hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .hero-image-wrapper {
    max-width: 600px;
    margin: 0 auto;
  }

  .hero-card-decoration.card-1 {
    left: -20px;
  }
  
  .keywords-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .features-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .activities-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-container {
    grid-template-columns: 1.2fr 1fr;
    gap: 40px;
  }
  
  .footer-contact {
    grid-column: span 2;
  }
}

@media (max-width: 768px) {
  .site-header {
    height: 70px;
  }
  
  .main-nav {
    display: none;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .hero-section {
    padding: 155px 0 60px 0;
  }
  
  .hero-content h1 {
    font-size: 2.2rem;
  }
  
  .hero-content h1 span {
    font-size: 1.7rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    width: 100%;
    gap: 12px;
  }
  
  .hero-buttons .btn {
    width: 100%;
  }
  
  .keywords-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .activities-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  .timeline-badge {
    left: -25px;
    width: 50px;
    font-size: 0.7rem;
    transform: translateX(-5px);
  }
  
  .apply-box {
    padding: 50px 20px;
  }
  
  .apply-box h2,
  .section-header h2 {
    font-size: 2.2rem; /* 모바일 대제목 2.2rem 정밀 조율 */
    line-height: 1.35;
    word-break: keep-all;
  }

  /* 활동내역 대제목만 모바일에서 한 줄로 안착하도록 미세 조정 */
  .activity-section .section-header h2 {
    font-size: 1.8rem;
  }

  /* 지원 박스 대제목 크기만 모바일에서 한 단계 축소하여 의도한 줄바꿈 유도 */
  .apply-box h2 {
    font-size: 1.8rem;
  }
  
  .apply-info-cards {
    flex-direction: column;
    align-items: center;
    gap: 15px;
  }
  
  .info-card {
    width: 100%;
    max-width: 280px;
  }
  
  .footer-container {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  .footer-contact {
    grid-column: span 1;
  }

  /* 모바일 화면에서만 줄바꿈 태그 활성화 */
  .mobile-only {
    display: inline;
  }
}