/* ==========================================================================
   재우 이미지 미리보기 — Style System
   Dark theme + Gold accent, glassmorphism cards
   ========================================================================== */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Noto+Sans+KR:wght@300;400;500;600;700&display=swap');

/* --- Design Tokens --- */
:root {
  /* Colors */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-card-hover: rgba(255, 255, 255, 0.06);
  --bg-glass: rgba(18, 18, 26, 0.85);
  --bg-lightbox: rgba(0, 0, 0, 0.92);

  --gold-dark: #a07d3a;
  --gold: #d4a754;
  --gold-light: #f0c674;
  --gold-glow: rgba(212, 167, 84, 0.15);
  --gold-glow-strong: rgba(212, 167, 84, 0.3);

  --text-primary: #e8e6e3;
  --text-secondary: #8a8a95;
  --text-muted: #55555f;
  --text-gold: #d4a754;

  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-card: rgba(255, 255, 255, 0.08);
  --border-gold: rgba(212, 167, 84, 0.3);

  --danger: #e85d5d;
  --danger-bg: rgba(232, 93, 93, 0.1);

  --nsfw-blur: 24px;

  /* Typography */
  --font-ui: 'Inter', 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-kr: 'Noto Sans KR', 'Inter', sans-serif;

  /* Spacing */
  --gap-xs: 4px;
  --gap-sm: 8px;
  --gap-md: 16px;
  --gap-lg: 24px;
  --gap-xl: 32px;
  --gap-2xl: 48px;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Shadows */
  --shadow-card: 0 2px 8px rgba(0, 0, 0, 0.3), 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-card-hover: 0 8px 32px rgba(0, 0, 0, 0.4), 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-gold: 0 0 20px rgba(212, 167, 84, 0.15);
  --shadow-lightbox: 0 25px 80px rgba(0, 0, 0, 0.6);
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-ui);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* Subtle background pattern */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% -20%, rgba(212, 167, 84, 0.04) 0%, transparent 70%),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(212, 167, 84, 0.02) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

/* --- Header --- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  border-bottom: 1px solid var(--border-subtle);
}

.header-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: var(--gap-md) var(--gap-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap-md);
}

.header-title {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
}

.header-title h1 {
  font-family: var(--font-kr);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.header-title .accent {
  color: var(--gold);
}

.header-title .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 8px var(--gold-glow-strong);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.85); }
}

.header-stats {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.header-stats span {
  color: var(--gold-light);
  font-weight: 600;
}

/* --- NSFW Toggle --- */
.nsfw-toggle-wrapper {
  display: flex;
  align-items: center;
  gap: var(--gap-sm);
}

.nsfw-label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  user-select: none;
}

.nsfw-toggle {
  position: relative;
  width: 44px;
  height: 24px;
  cursor: pointer;
}

.nsfw-toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.nsfw-toggle .slider {
  position: absolute;
  inset: 0;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 12px;
  transition: var(--transition-normal);
}

.nsfw-toggle .slider::before {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--text-secondary);
  transition: var(--transition-spring);
}

.nsfw-toggle input:checked + .slider {
  background: var(--danger-bg);
  border-color: rgba(232, 93, 93, 0.3);
}

.nsfw-toggle input:checked + .slider::before {
  transform: translateX(20px);
  background: var(--danger);
  box-shadow: 0 0 8px rgba(232, 93, 93, 0.4);
}

/* --- Filter Tabs --- */
.filter-bar {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.filter-bar::-webkit-scrollbar {
  display: none;
}

.filter-tabs {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--gap-lg);
  display: flex;
  gap: var(--gap-xs);
  list-style: none;
}

.filter-tab {
  padding: var(--gap-md) var(--gap-lg);
  font-family: var(--font-kr);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  border: none;
  background: none;
  position: relative;
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.filter-tab:hover {
  color: var(--text-primary);
}

.filter-tab.active {
  color: var(--gold);
}

.filter-tab::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gold-dark), var(--gold-light));
  border-radius: 1px 1px 0 0;
  transition: var(--transition-normal);
  transform: translateX(-50%);
}

.filter-tab.active::after {
  width: calc(100% - var(--gap-xl));
}

.filter-tab .count {
  display: inline-block;
  margin-left: var(--gap-xs);
  padding: 1px 6px;
  font-size: 0.7rem;
  font-weight: 600;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-muted);
  transition: var(--transition-fast);
}

.filter-tab.active .count {
  background: var(--gold-glow);
  color: var(--gold);
}

.filter-tab.nsfw-tab.active {
  color: var(--danger);
}

.filter-tab.nsfw-tab.active::after {
  background: linear-gradient(90deg, #c94444, #e85d5d);
}

.filter-tab.nsfw-tab.active .count {
  background: var(--danger-bg);
  color: var(--danger);
}

/* --- Main Content --- */
.main {
  position: relative;
  z-index: 1;
  max-width: 1440px;
  margin: 0 auto;
  padding: var(--gap-xl) var(--gap-lg) var(--gap-2xl);
}

/* --- Category Section --- */
.category-section {
  margin-bottom: var(--gap-2xl);
  animation: fade-in-up 0.5s ease-out both;
}

.category-section:nth-child(2) { animation-delay: 0.1s; }
.category-section:nth-child(3) { animation-delay: 0.2s; }
.category-section:nth-child(4) { animation-delay: 0.3s; }

.category-header {
  display: flex;
  align-items: baseline;
  gap: var(--gap-sm);
  margin-bottom: var(--gap-lg);
  padding-bottom: var(--gap-sm);
  border-bottom: 1px solid var(--border-subtle);
}

.category-name {
  font-family: var(--font-kr);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.category-name-en {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--text-muted);
}

.category-desc {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.category-section.nsfw-category .category-name {
  color: var(--danger);
}

/* --- Image Grid --- */
.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--gap-md);
}

.image-grid.expression-grid {
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
}

.image-grid.nsfw-grid {
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}

.image-grid.illustration-grid {
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

/* --- Image Card --- */
.image-card {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  cursor: pointer;
  transition:
    transform var(--transition-normal),
    box-shadow var(--transition-normal),
    border-color var(--transition-normal);
  animation: fade-in-up 0.4s ease-out both;
}

.image-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--border-gold);
}

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

.card-image {
  position: relative;
  width: 100%;
  aspect-ratio: 2 / 3;
  overflow: hidden;
  background: var(--bg-secondary);
}

.nsfw-grid .card-image,
.image-grid.nsfw-grid .card-image {
  aspect-ratio: 3 / 2;
}

.illustration-grid .card-image {
  aspect-ratio: auto;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

/* Loading shimmer */
.card-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    110deg,
    transparent 25%,
    rgba(255, 255, 255, 0.03) 37%,
    transparent 50%
  );
  background-size: 200% 100%;
  animation: shimmer 1.8s ease-in-out infinite;
  z-index: 1;
  pointer-events: none;
  opacity: 1;
  transition: opacity var(--transition-normal);
}

.card-image.loaded::before {
  opacity: 0;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Card label */
.card-label {
  padding: var(--gap-sm) var(--gap-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap-xs);
  background: rgba(0, 0, 0, 0.2);
}

.card-label-text {
  font-family: var(--font-kr);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-primary);
}

.card-label-en {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 400;
}

/* --- NSFW Blur Overlay --- */
.nsfw-blurred .card-image img {
  filter: blur(var(--nsfw-blur)) brightness(0.5);
}

.nsfw-blurred .nsfw-overlay {
  display: flex;
}

.nsfw-overlay {
  display: none;
  position: absolute;
  inset: 0;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--gap-sm);
  z-index: 5;
  color: var(--text-secondary);
  pointer-events: none;
}

.nsfw-overlay .lock-icon {
  width: 28px;
  height: 28px;
  opacity: 0.6;
}

.nsfw-overlay .nsfw-text {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  opacity: 0.5;
}

/* --- Error / Not Uploaded State --- */
.card-error {
  display: none;
  position: absolute;
  inset: 0;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--gap-sm);
  background: var(--bg-secondary);
  z-index: 2;
}

.card-error.visible {
  display: flex;
}

.card-error .error-icon {
  font-size: 1.5rem;
  opacity: 0.3;
}

.card-error .error-text {
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* --- Lightbox --- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-lightbox);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.lightbox.open {
  opacity: 1;
  visibility: visible;
}

.lightbox-content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--gap-md);
  transform: scale(0.95);
  transition: transform var(--transition-spring);
}

.lightbox.open .lightbox-content {
  transform: scale(1);
}

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

.lightbox-info {
  text-align: center;
}

.lightbox-label {
  font-family: var(--font-kr);
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
}

.lightbox-label-en {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.lightbox-filename {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: var(--gap-xs);
  font-family: 'SF Mono', 'Fira Code', monospace;
}

/* Lightbox Controls */
.lightbox-close {
  position: absolute;
  top: -40px;
  right: 0;
  width: 36px;
  height: 36px;
  border: none;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-secondary);
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border: none;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-secondary);
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
  backdrop-filter: blur(8px);
}

.lightbox-nav:hover {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-primary);
}

.lightbox-prev { left: -60px; }
.lightbox-next { right: -60px; }

.lightbox-counter {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: var(--gap-xs);
}

/* --- Footer --- */
.footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--gap-xl) var(--gap-lg);
  border-top: 1px solid var(--border-subtle);
}

.footer p {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* --- Animations --- */
@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Staggered card animation */
.image-card:nth-child(1)  { animation-delay: 0.02s; }
.image-card:nth-child(2)  { animation-delay: 0.04s; }
.image-card:nth-child(3)  { animation-delay: 0.06s; }
.image-card:nth-child(4)  { animation-delay: 0.08s; }
.image-card:nth-child(5)  { animation-delay: 0.10s; }
.image-card:nth-child(6)  { animation-delay: 0.12s; }
.image-card:nth-child(7)  { animation-delay: 0.14s; }
.image-card:nth-child(8)  { animation-delay: 0.16s; }
.image-card:nth-child(9)  { animation-delay: 0.18s; }
.image-card:nth-child(10) { animation-delay: 0.20s; }
.image-card:nth-child(11) { animation-delay: 0.22s; }
.image-card:nth-child(12) { animation-delay: 0.24s; }
.image-card:nth-child(13) { animation-delay: 0.26s; }
.image-card:nth-child(14) { animation-delay: 0.28s; }
.image-card:nth-child(15) { animation-delay: 0.30s; }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .header-inner {
    flex-wrap: wrap;
    gap: var(--gap-sm);
  }

  .lightbox-prev { left: 10px; }
  .lightbox-next { right: 10px; }

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

@media (max-width: 768px) {
  .header-inner {
    padding: var(--gap-sm) var(--gap-md);
  }

  .header-title h1 {
    font-size: 1.05rem;
  }

  .filter-tabs {
    padding: 0 var(--gap-md);
  }

  .filter-tab {
    padding: var(--gap-sm) var(--gap-md);
    font-size: 0.8rem;
  }

  .main {
    padding: var(--gap-md) var(--gap-md) var(--gap-xl);
  }

  .image-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: var(--gap-sm);
  }

  .image-grid.nsfw-grid {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  }

  .image-grid.illustration-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  }

  .lightbox-close {
    top: 10px;
    right: 10px;
    position: fixed;
  }

  .lightbox-prev { left: 6px; }
  .lightbox-next { right: 6px; }

  .lightbox-image {
    max-width: 95vw;
    max-height: 75vh;
  }
}

@media (max-width: 480px) {
  .image-grid.expression-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .image-grid.nsfw-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .header-stats {
    display: none;
  }
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* Utility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}