/* ==========================================================================
   MINSEO YU PORTFOLIO - MODERN SLIDER & GALLERY STYLES
   ========================================================================== */

:root {
  --bg-color: #0b0d13;
  --bg-secondary: #131722;
  --bg-card: rgba(22, 27, 38, 0.75);
  --bg-card-hover: rgba(30, 37, 52, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-active: rgba(99, 102, 241, 0.6);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.25);
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  --slider-height: 68vh;
  --slider-max-height: 720px;
  --slider-min-height: 380px;
  --radius-lg: 20px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --font-en: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-kr: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

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

body {
  font-family: var(--font-en), var(--font-kr);
  background-color: var(--bg-color);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Ambient Background Glow */
.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.35;
}

.bg-glow-1 {
  width: 500px;
  height: 500px;
  top: -100px;
  left: 10%;
  background: radial-gradient(circle, #4f46e5 0%, transparent 70%);
}

.bg-glow-2 {
  width: 600px;
  height: 600px;
  top: 30%;
  right: -100px;
  background: radial-gradient(circle, #7c3aed 0%, transparent 70%);
}

/* ==========================================================================
   Header Navigation
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 13, 19, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 1.5rem;
  transition: var(--transition-smooth);
}

.header-container {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.brand-badge {
  background: var(--accent-gradient);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  box-shadow: 0 2px 10px var(--accent-glow);
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: #fff;
}

.brand-subtitle {
  font-size: 0.82rem;
  color: var(--text-muted);
  font-weight: 500;
  border-left: 1px solid var(--border-color);
  padding-left: 0.85rem;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.slide-counter {
  font-family: var(--font-en);
  font-size: 0.95rem;
  font-weight: 700;
  background: rgba(255, 255, 255, 0.04);
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.current-index {
  color: var(--accent-light);
}

.divider {
  color: var(--text-muted);
  font-weight: 400;
}

.total-count {
  color: var(--text-secondary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.icon-btn, .view-switch-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition-smooth);
}

.icon-btn:hover, .view-switch-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-1px);
}

.icon-btn.active {
  background: var(--accent-gradient);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 2px 12px var(--accent-glow);
}

/* ==========================================================================
   Main Content Layout
   ========================================================================== */

.main-content {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 5rem 1.5rem;
}

/* ==========================================================================
   Hero Slider Section
   ========================================================================== */

.slider-section {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 4rem;
}

.slider-wrapper {
  position: relative;
  width: 100%;
  height: var(--slider-height);
  min-height: var(--slider-min-height);
  max-height: var(--slider-max-height);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #000;
  border: 1px solid var(--border-color);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6);
  user-select: none;
}

.slider-viewport {
  width: 100%;
  height: 100%;
  overflow: hidden;
  position: relative;
  cursor: grab;
}

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

.slider-track {
  display: flex;
  height: 100%;
  width: 100%;
  transition: transform 0.55s cubic-bezier(0.25, 1, 0.5, 1);
  will-change: transform;
}

.slide-item {
  flex: 0 0 100%;
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #08090d;
}

/* Blurred Ambient Backdrop behind main image */
.slide-bg-blur {
  position: absolute;
  top: -10%;
  left: -10%;
  width: 120%;
  height: 120%;
  background-size: cover;
  background-position: center;
  filter: blur(40px) brightness(0.28) saturate(1.2);
  transform: scale(1.1);
  pointer-events: none;
}

.slide-image-container {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
  padding: 1.25rem;
}

.slide-img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: var(--radius-md);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.6);
  transition: transform 0.4s ease;
  pointer-events: auto;
}

.slide-item:hover .slide-img {
  transform: scale(1.015);
}

/* Nav Buttons (Left / Right) */
.nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: rgba(15, 18, 25, 0.65);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.prev-btn {
  left: 1.5rem;
}

.next-btn {
  right: 1.5rem;
}

.nav-btn:hover {
  background: rgba(99, 102, 241, 0.85);
  border-color: rgba(255, 255, 255, 0.35);
  transform: translateY(-50%) scale(1.08);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.nav-btn:active {
  transform: translateY(-50%) scale(0.96);
}

/* Slider Progress Bar */
.slider-progress-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: rgba(255, 255, 255, 0.08);
  z-index: 10;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent-gradient);
  transition: width 0.3s ease;
}

/* Slide Meta Bar */
.slide-meta-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem 1.5rem;
  backdrop-filter: blur(12px);
}

.slide-info-panel {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.info-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-light);
}

.info-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.01em;
}

.info-filename {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: monospace;
}

.slide-control-tools {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.tool-btn {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.tool-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-1px);
}

/* ==========================================================================
   Thumbnails Strip
   ========================================================================== */

.thumbnails-container {
  width: 100%;
  overflow: hidden;
  padding: 0.25rem 0;
}

.thumbnails-track {
  display: flex;
  gap: 0.75rem;
  overflow-x: auto;
  scroll-behavior: smooth;
  padding: 0.5rem 0.25rem;
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) transparent;
}

.thumbnails-track::-webkit-scrollbar {
  height: 6px;
}

.thumbnails-track::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.12);
  border-radius: 999px;
}

.thumb-item {
  flex: 0 0 110px;
  height: 72px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  position: relative;
  cursor: pointer;
  border: 2px solid transparent;
  background: #11141c;
  opacity: 0.5;
  transition: var(--transition-smooth);
}

.thumb-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.thumb-item:hover {
  opacity: 0.85;
  transform: translateY(-2px);
}

.thumb-item.active {
  opacity: 1;
  border-color: var(--accent);
  box-shadow: 0 0 14px var(--accent-glow);
  transform: translateY(-3px) scale(1.04);
}

.thumb-index {
  position: absolute;
  bottom: 3px;
  right: 5px;
  font-size: 0.65rem;
  font-weight: 700;
  background: rgba(0, 0, 0, 0.7);
  padding: 1px 4px;
  border-radius: 3px;
  color: #fff;
}

.slider-hint {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Gallery Overview Grid
   ========================================================================== */

.gallery-section {
  margin-top: 3rem;
  padding-top: 3rem;
  border-top: 1px solid var(--border-color);
}

.section-header {
  margin-bottom: 2rem;
}

.section-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.4rem;
}

.sub-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-light);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: rgba(99, 102, 241, 0.1);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.section-title {
  font-size: 1.6rem;
  font-weight: 800;
  color: #fff;
}

.section-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.grid-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
}

.grid-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-active);
  background: var(--bg-card-hover);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4);
}

.grid-card-thumb {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: #0f121a;
}

.grid-card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.grid-card:hover .grid-card-thumb img {
  transform: scale(1.08);
}

.grid-card-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.75) 0%, transparent 60%);
  opacity: 0;
  display: flex;
  align-items: flex-end;
  padding: 1rem;
  transition: opacity 0.3s ease;
}

.grid-card:hover .grid-card-overlay {
  opacity: 1;
}

.overlay-action {
  font-size: 0.8rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.grid-card-body {
  padding: 1rem 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.card-num {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent-light);
  letter-spacing: 0.05em;
}

.card-title {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-meta {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Lightbox Modal
   ========================================================================== */

.lightbox-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}

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

.lightbox-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(5, 7, 10, 0.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.lightbox-dialog {
  position: relative;
  z-index: 2;
  width: 95vw;
  max-width: 1500px;
  height: 94vh;
  display: flex;
  flex-direction: column;
}

.lightbox-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.lightbox-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.lightbox-counter {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent-light);
  background: rgba(255, 255, 255, 0.06);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}

.lightbox-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: #fff;
}

.lightbox-close-btn {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  color: #fff;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.lightbox-close-btn:hover {
  background: rgba(239, 68, 68, 0.85);
  border-color: transparent;
  transform: scale(1.08);
}

.lightbox-content {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 1rem 4rem;
}

.lightbox-img-wrapper {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-img-wrapper img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: var(--radius-sm);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
  transition: transform 0.3s ease;
}

.lightbox-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.lightbox-nav-btn:hover {
  background: var(--accent);
  border-color: transparent;
  transform: translateY(-50%) scale(1.08);
}

.lb-prev {
  left: 1rem;
}

.lb-next {
  right: 1rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  border-top: 1px solid var(--border-color);
  padding: 2rem 1.5rem;
  background: rgba(11, 13, 19, 0.95);
  position: relative;
  z-index: 10;
}

.footer-container {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.copyright {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.back-to-top {
  color: var(--accent-light);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  transition: var(--transition-smooth);
}

.back-to-top:hover {
  background: rgba(99, 102, 241, 0.15);
  border-color: var(--accent);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */

@media (max-width: 900px) {
  :root {
    --slider-height: 54vh;
  }

  .brand-subtitle {
    display: none;
  }

  .nav-btn {
    width: 44px;
    height: 44px;
  }

  .prev-btn {
    left: 0.75rem;
  }

  .next-btn {
    right: 0.75rem;
  }

  .slide-meta-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.85rem;
  }

  .slide-control-tools {
    width: 100%;
    justify-content: flex-end;
  }

  .lightbox-content {
    padding: 1rem;
  }

  .lb-prev {
    left: 0.5rem;
  }

  .lb-next {
    right: 0.5rem;
  }
}

@media (max-width: 600px) {
  :root {
    --slider-height: 46vh;
    --slider-min-height: 300px;
  }

  .site-header {
    padding: 0.85rem 1rem;
  }

  .brand-title {
    font-size: 1.05rem;
  }

  .main-content {
    padding: 1rem 0.85rem 3rem 0.85rem;
  }

  .gallery-grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 0.85rem;
  }

  .grid-card-body {
    padding: 0.75rem;
  }

  .card-title {
    font-size: 0.85rem;
  }

  .thumb-item {
    flex: 0 0 85px;
    height: 56px;
  }
}