/* ===== 기본 초기화 & 폰트 설정 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-color: #0e1117;
  --surface-color: #171b22;
  --card-bg: #1c212b;
  --border-color: #2b313e;
  --text-main: #f0f3f6;
  --text-sub: #8b949e;
  --accent-color: #3b82f6;
  --accent-hover: #60a5fa;
  --accent-gradient: linear-gradient(135deg, #3b82f6, #8b5cf6);
  --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.45);
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.25);
  --radius-lg: 16px;
  --radius-sm: 8px;
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  line-height: 1.6;
}

/* ===== 헤더 ===== */
.header {
  border-bottom: 1px solid var(--border-color);
  background: rgba(14, 17, 23, 0.85);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 2px;
  text-decoration: none;
  color: var(--text-main);
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-tag {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-sub);
  padding: 0.35rem 0.85rem;
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  letter-spacing: 0.5px;
}

/* ===== 메인 컨테이너 ===== */
.main-container {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.intro-section {
  text-align: center;
  margin-bottom: 2.5rem;
}

.subtitle {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--accent-color);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

.title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
  margin-bottom: 0.75rem;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.description {
  font-size: 1rem;
  color: var(--text-sub);
  max-width: 580px;
  margin: 0 auto;
}

/* ===== 슬라이더 래퍼 ===== */
.slider-wrapper {
  max-width: 1000px;
  margin: 0 auto;
}

/* 슬라이더 컨테이너 */
.slider-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  max-height: 580px;
  background-color: var(--card-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  user-select: none;
  cursor: grab;
}

.slider-container:active {
  cursor: grabbing;
}

/* 슬라이더 트랙 */
.slider-track {
  display: flex;
  height: 100%;
  width: 100%;
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: transform;
}

/* 개별 슬라이드 */
.slide {
  flex: 0 0 100%;
  height: 100%;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #090c10;
  overflow: hidden;
}

.slide img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform 0.4s ease;
  pointer-events: auto;
  cursor: zoom-in;
}

.slide:hover img {
  transform: scale(1.02);
}

/* 슬라이드 내부 캡션 오버레이 */
.slide-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 2.5rem 2rem 1.5rem;
  background: linear-gradient(to top, rgba(14, 17, 23, 0.95) 0%, rgba(14, 17, 23, 0.6) 60%, transparent 100%);
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  pointer-events: none;
}

.slide-info {
  max-width: 70%;
}

.slide-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-color);
  background: rgba(59, 130, 246, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.3);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  margin-bottom: 0.4rem;
  text-transform: uppercase;
}

.slide-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.25rem;
}

.slide-desc {
  font-size: 0.88rem;
  color: var(--text-sub);
}

.slide-zoom-hint {
  font-size: 0.8rem;
  color: var(--text-sub);
  background: rgba(255, 255, 255, 0.1);
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius-sm);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* 네비게이션 좌/우 버튼 */
.nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(23, 27, 34, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  backdrop-filter: blur(8px);
  z-index: 10;
}

.nav-btn:hover {
  background: var(--accent-color);
  color: #fff;
  border-color: var(--accent-color);
  transform: translateY(-50%) scale(1.1);
}

.nav-btn.prev {
  left: 1.25rem;
}

.nav-btn.next {
  right: 1.25rem;
}

/* ===== 슬라이더 컨트롤 (하단 카운터, 인디케이터, 자동재생) ===== */
.slider-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.25rem;
  padding: 0.75rem 1rem;
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  gap: 1rem;
  flex-wrap: wrap;
}

.slide-counter {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.slide-counter .divider {
  color: var(--text-sub);
  font-weight: 400;
}

.slider-dots {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 5px;
  background: var(--border-color);
  cursor: pointer;
  border: none;
  transition: var(--transition);
  padding: 0;
}

.dot.active {
  width: 28px;
  background: var(--accent-color);
}

.autoplay-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-sub);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
}

.autoplay-btn:hover {
  border-color: var(--accent-color);
  color: var(--text-main);
}

.autoplay-btn.paused {
  color: #ef4444;
  border-color: rgba(239, 68, 68, 0.4);
}

/* ===== 썸네일 바 ===== */
.thumbnails-container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 0.85rem;
  margin-top: 1.5rem;
}

.thumbnail-card {
  position: relative;
  aspect-ratio: 16 / 10;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 2px solid var(--border-color);
  background: var(--surface-color);
  cursor: pointer;
  transition: var(--transition);
}

.thumbnail-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.thumbnail-card:hover {
  border-color: var(--accent-hover);
}

.thumbnail-card:hover img {
  transform: scale(1.05);
}

.thumbnail-card.active {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.4);
}

.thumbnail-card.active::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px solid var(--accent-color);
  border-radius: calc(var(--radius-sm) - 2px);
  pointer-events: none;
}

/* ===== 라이트박스 (확대 모달) ===== */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.lightbox.active {
  opacity: 1;
  pointer-events: auto;
}

.lightbox-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(8px);
}

.lightbox-content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  z-index: 1001;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lightbox-img {
  max-width: 90vw;
  max-height: 80vh;
  object-fit: contain;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
}

.lightbox-caption {
  margin-top: 1rem;
  color: #fff;
  font-size: 1rem;
  font-weight: 500;
  text-align: center;
}

.lightbox-close {
  position: absolute;
  top: -45px;
  right: 0;
  background: transparent;
  border: none;
  color: #fff;
  font-size: 2.2rem;
  line-height: 1;
  cursor: pointer;
  transition: color 0.2s ease;
}

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

/* ===== 푸터 ===== */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--border-color);
  padding: 1.5rem 0;
  text-align: center;
  color: var(--text-sub);
  font-size: 0.85rem;
}

/* ===== 반응형 미디어 쿼리 ===== */
@media (max-width: 768px) {
  .main-container {
    padding: 2rem 1rem;
  }

  .nav-btn {
    width: 38px;
    height: 38px;
  }

  .nav-btn.prev {
    left: 0.5rem;
  }

  .nav-btn.next {
    right: 0.5rem;
  }

  .slide-overlay {
    padding: 1.5rem 1rem 1rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .slide-info {
    max-width: 100%;
  }

  .slide-title {
    font-size: 1.1rem;
  }

  .slide-zoom-hint {
    display: none;
  }

  .slider-controls {
    flex-direction: column;
    gap: 0.75rem;
  }
}