/* ==========================================================================
   Design Portfolio Theme & Reset
   ========================================================================== */
:root {
  --bg-primary: #0a0c10;
  --bg-secondary: #12161f;
  --bg-card: #181d28;
  --bg-card-hover: #222938;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-active: rgba(255, 255, 255, 0.25);
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-dim: #6b7280;
  --accent: #6366f1;
  --accent-light: #818cf8;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  --slider-height: 580px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
  font-family: 'Plus Jakarta Sans', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ==========================================================================
   Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 12, 16, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.25rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.brand-badge {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  background: var(--accent-gradient);
  color: #ffffff;
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
  padding: 0.25rem 0;
}

.nav-link:hover, .nav-link.active {
  color: #ffffff;
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: 2px;
}

/* ==========================================================================
   Main Content Layout
   ========================================================================== */
.main-content {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2.5rem 2rem 5rem;
  display: flex;
  flex-direction: column;
  gap: 5rem;
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 1.75rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--accent-light);
  margin-bottom: 0.35rem;
}

.section-title {
  font-size: 1.85rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: #ffffff;
}

/* ==========================================================================
   Featured Slider Section
   ========================================================================== */
.slider-status {
  font-family: 'Plus Jakarta Sans', monospace;
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  background: var(--bg-card);
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
}

.highlight-number {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
}

.divider {
  color: var(--text-dim);
  font-size: 0.9rem;
}

.total-number {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.slider-container {
  position: relative;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  box-shadow: 0 24px 48px -12px rgba(0, 0, 0, 0.5);
}

.slider-viewport {
  position: relative;
  width: 100%;
  height: var(--slider-height);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at center, #1b212f 0%, #0d1017 100%);
}

.slider-track {
  display: flex;
  width: 100%;
  height: 100%;
  transition: transform 0.45s cubic-bezier(0.2, 0.8, 0.2, 1);
  user-select: none;
}

.slide-item {
  min-width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: 2rem;
}

/* Ambient Blurred Glow for artwork presentation */
.slide-ambient-glow {
  position: absolute;
  inset: -10%;
  background-size: cover;
  background-position: center;
  filter: blur(50px) brightness(0.25);
  opacity: 0.6;
  z-index: 1;
  pointer-events: none;
  transform: scale(1.1);
}

.slide-image {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  position: relative;
  z-index: 2;
  border-radius: var(--radius-sm);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.6);
  cursor: zoom-in;
  transition: transform 0.3s ease;
}

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

/* PDF Slide Preview Card */
.slide-pdf-card {
  position: relative;
  z-index: 2;
  background: var(--bg-card);
  border: 1px solid var(--border-active);
  border-radius: var(--radius-md);
  padding: 3rem;
  max-width: 480px;
  width: 90%;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.6);
}

.pdf-icon-badge {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: rgba(239, 68, 68, 0.15);
  color: #ef4444;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
}

.pdf-card-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
}

.pdf-card-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.pdf-open-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent-gradient);
  color: #ffffff;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
}

.pdf-open-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

/* Navigation Arrow Buttons */
.nav-arrow {
  position: absolute;
  top: calc(50% - 30px);
  z-index: 10;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(18, 22, 31, 0.75);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-subtle);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: 0 4px 14px rgba(0,0,0,0.4);
}

.prev-btn {
  left: 1.5rem;
}

.next-btn {
  right: 1.5rem;
}

.nav-arrow:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--border-active);
  transform: scale(1.08);
}

.nav-arrow:active {
  transform: scale(0.95);
}

/* Slider Bottom Control Bar */
.slider-controls-bar {
  background: rgba(14, 17, 24, 0.9);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--border-subtle);
  padding: 1.25rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.slide-caption {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.caption-category {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-light);
  font-weight: 600;
}

.caption-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #ffffff;
}

.playback-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.control-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  padding: 0.55rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.control-btn:hover {
  background: var(--bg-card-hover);
  color: #ffffff;
  border-color: var(--border-active);
}

/* Progress Bar */
.progress-bar-wrapper {
  width: 100%;
  height: 3px;
  background: rgba(255, 255, 255, 0.05);
}

.progress-bar {
  height: 100%;
  width: 9%;
  background: var(--accent-gradient);
  transition: width 0.3s ease;
}

/* ==========================================================================
   Thumbnail Strip
   ========================================================================== */
.thumbnails-container {
  margin-top: 1.5rem;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  padding: 0.75rem;
}

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

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

.thumbnails-track::-webkit-scrollbar-thumb {
  background: var(--border-active);
  border-radius: 3px;
}

.thumb-item {
  flex: 0 0 100px;
  height: 70px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 2px solid transparent;
  cursor: pointer;
  position: relative;
  opacity: 0.45;
  transition: var(--transition);
  background: #000;
}

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

.thumb-item.pdf-thumb {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #2a1515;
  color: #ef4444;
  font-size: 0.75rem;
  font-weight: 700;
}

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

.thumb-item.active {
  opacity: 1;
  border-color: var(--accent-light);
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.5);
  transform: translateY(-2px);
}

/* ==========================================================================
   All Works Gallery Grid Section
   ========================================================================== */
.gallery-section {
  border-top: 1px solid var(--border-subtle);
  padding-top: 3.5rem;
}

.filter-tabs {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.filter-tab {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  padding: 0.5rem 1.15rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.filter-tab:hover {
  color: #ffffff;
  border-color: var(--border-active);
}

.filter-tab.active {
  background: var(--text-main);
  color: var(--bg-primary);
  font-weight: 600;
  border-color: var(--text-main);
}

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

.gallery-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
}

.gallery-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-active);
  box-shadow: 0 16px 32px -8px rgba(0, 0, 0, 0.6);
}

.card-media-wrapper {
  width: 100%;
  height: 240px;
  position: relative;
  overflow: hidden;
  background: #080a0e;
}

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

.gallery-card:hover .card-img {
  transform: scale(1.06);
}

.card-pdf-fallback {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, #1f1418 0%, #15101b 100%);
  color: #ef4444;
}

.card-pdf-icon {
  font-size: 2.5rem;
}

.card-overlay-badge {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  background: rgba(10, 12, 16, 0.75);
  backdrop-filter: blur(8px);
  color: var(--text-muted);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
}

.card-content {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: #ffffff;
}

.card-category {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==========================================================================
   Lightbox Modal
   ========================================================================== */
.lightbox-modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.lightbox-modal.active {
  opacity: 1;
  visibility: visible;
}

.lightbox-overlay {
  position: absolute;
  inset: 0;
  background: rgba(5, 7, 10, 0.92);
  backdrop-filter: blur(12px);
}

.lightbox-content {
  position: relative;
  z-index: 2;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.lightbox-close {
  position: fixed;
  top: 1.75rem;
  right: 2rem;
  z-index: 10;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--border-subtle);
  color: #ffffff;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: rotate(90deg);
}

.lightbox-nav-btn {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--border-subtle);
  color: #ffffff;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.lightbox-nav-btn.prev {
  left: 2rem;
}

.lightbox-nav-btn.next {
  right: 2rem;
}

.lightbox-nav-btn:hover {
  background: rgba(255, 255, 255, 0.25);
  transform: translateY(-50%) scale(1.1);
}

.lightbox-media-wrapper {
  max-width: 82vw;
  max-height: 72vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-image {
  max-width: 100%;
  max-height: 72vh;
  object-fit: contain;
  border-radius: var(--radius-sm);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8);
}

.lightbox-pdf-view {
  width: 75vw;
  height: 70vh;
  background: #ffffff;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.lightbox-pdf-view iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.lightbox-info {
  margin-top: 1.25rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
}

.lightbox-category {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-light);
  font-weight: 600;
}

.lightbox-title {
  font-size: 1.25rem;
  color: #ffffff;
  font-weight: 700;
}

.lightbox-actions {
  margin-top: 0.5rem;
}

.raw-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.08);
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  transition: var(--transition);
}

.raw-link-btn:hover {
  background: rgba(255, 255, 255, 0.16);
  color: #ffffff;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-secondary);
  padding: 3rem 2rem;
  text-align: center;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.copyright {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-hint {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* ==========================================================================
   Responsive Breakpoints
   ========================================================================== */
@media (max-width: 900px) {
  :root {
    --slider-height: 440px;
  }
  .header-inner {
    padding: 1rem 1.25rem;
  }
  .main-content {
    padding: 1.5rem 1.25rem 4rem;
    gap: 3.5rem;
  }
  .nav-arrow {
    width: 42px;
    height: 42px;
  }
  .prev-btn { left: 0.75rem; }
  .next-btn { right: 0.75rem; }
}

@media (max-width: 640px) {
  :root {
    --slider-height: 350px;
  }
  .slider-controls-bar {
    padding: 1rem;
    flex-direction: column;
    align-items: flex-start;
  }
  .playback-controls {
    width: 100%;
    justify-content: flex-end;
  }
  .gallery-grid {
    grid-template-columns: 1fr;
  }
  .lightbox-nav-btn {
    width: 42px;
    height: 42px;
  }
  .lightbox-nav-btn.prev { left: 0.5rem; }
  .lightbox-nav-btn.next { right: 0.5rem; }
}