/* ========================================
   AI Image Library - Stylesheet
   Thiết kế dark mode hiện đại, glassmorphism
   ======================================== */

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

:root {
  /* Màu chủ đạo */
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #16161f;
  --bg-card-hover: #1c1c28;
  --bg-glass: rgba(22, 22, 31, 0.75);
  
  /* Accent gradient */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-accent: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --gradient-subtle: linear-gradient(135deg, #667eea22 0%, #764ba222 100%);
  
  /* Text */
  --text-primary: #e5e5ef;
  --text-secondary: #9898ad;
  --text-muted: #5a5a70;
  
  /* Borders */
  --border-default: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);
  
  /* Highlight */
  --highlight-bg: #ffd700;
  --highlight-text: #000;
  
  /* Spacing & radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  /* Font */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

html {
  scroll-behavior: smooth;
}

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

/* === Header === */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-default);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0.75rem 2rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 1.2rem;
}

.logo-icon {
  font-size: 1.5rem;
  animation: sparkle 2s ease-in-out infinite;
}

@keyframes sparkle {
  0%, 100% { transform: scale(1) rotate(0deg); }
  50% { transform: scale(1.2) rotate(10deg); }
}

#main-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.nav-link.active {
  color: var(--text-primary);
  background: rgba(102, 126, 234, 0.15);
}

.user-info {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-left: 0.5rem;
}

/* === Hero Section === */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 280px;
  padding: 6rem 2rem 3rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(ellipse at 20% 50%, rgba(102, 126, 234, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 50%, rgba(118, 75, 162, 0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(240, 147, 251, 0.05) 0%, transparent 50%);
  animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
  0% { opacity: 0.7; transform: scale(1); }
  100% { opacity: 1; transform: scale(1.05); }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  letter-spacing: -0.03em;
}

.gradient-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 500px;
  margin: 0 auto 2rem;
}

.hero-stats {
  display: flex;
  gap: 3rem;
  justify-content: center;
}

.stat {
  text-align: center;
}

.stat-value {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* === Gallery Controls === */
main {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem 4rem;
}

.gallery-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.search-box {
  flex: 1;
  min-width: 280px;
}

.search-box input {
  width: 100%;
  padding: 0.75rem 1.25rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 0.95rem;
  font-family: var(--font-family);
  outline: none;
  transition: all 0.3s ease;
}

.search-box input:focus {
  border-color: rgba(102, 126, 234, 0.5);
  box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.search-box input::placeholder {
  color: var(--text-muted);
}

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

.filter-tag {
  padding: 0.4rem 0.8rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: 20px;
  color: var(--text-secondary);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-tag:hover, .filter-tag.active {
  background: rgba(102, 126, 234, 0.15);
  color: var(--text-primary);
  border-color: rgba(102, 126, 234, 0.3);
}

/* === Grid === */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

/* === Card === */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  overflow: hidden;
  cursor: pointer;
  border: 1px solid var(--border-default);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: 
    0 8px 32px rgba(0, 0, 0, 0.3),
    0 0 0 1px rgba(102, 126, 234, 0.1);
}

.card img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}

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

.card-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 3rem 1rem 1rem;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.85));
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

.card-info {
  padding: 0.875rem 1rem;
}

.card-info .summary {
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  line-height: 1.5;
}

.card-info .date {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.4rem;
}

.card-method {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  background: rgba(102, 126, 234, 0.15);
  color: #8ba0f0;
  border-radius: 4px;
  font-size: 0.7rem;
  font-weight: 500;
  margin-top: 0.3rem;
}

/* === Empty State === */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
}

.empty-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
  animation: float 3s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.empty-state h3 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.empty-state p {
  color: var(--text-secondary);
  max-width: 400px;
  margin: 0 auto;
}

/* === Loading === */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 2rem;
  color: var(--text-muted);
}

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--border-default);
  border-top-color: #667eea;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* === Load More Button === */
.btn-load-more {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 2.5rem auto 0;
  padding: 0.85rem 2.5rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  font-size: 0.95rem;
  font-family: var(--font-family);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-load-more:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

/* === Modal === */
.modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
}

.modal.hidden {
  display: none;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(8px);
}

.modal-content {
  position: relative;
  background: var(--bg-secondary);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  max-width: 1100px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  animation: modalIn 0.3s ease;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  z-index: 10;
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid var(--border-default);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.modal-close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.modal-image-wrap {
  padding: 1.5rem;
  display: flex;
  align-items: center;
}

.modal-image-wrap img {
  width: 100%;
  border-radius: var(--radius-md);
  object-fit: contain;
  max-height: 70vh;
}

.modal-details {
  padding: 2rem 2rem 2rem 0.5rem;
  overflow-y: auto;
}

.detail-section {
  margin-bottom: 1.5rem;
}

.detail-title {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.6rem;
  font-weight: 600;
}

.detail-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.prompt-box {
  background: var(--bg-primary);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-default);
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-height: 200px;
  overflow-y: auto;
}

.highlight {
  background: var(--highlight-bg);
  color: var(--highlight-text);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-weight: 600;
  font-size: 0.82rem;
}

.vars-list {
  list-style: none;
  padding: 0;
}

.vars-list li {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border-default);
  font-size: 0.88rem;
  color: var(--text-secondary);
  display: flex;
  gap: 0.5rem;
}

.vars-list li:last-child {
  border-bottom: none;
}

.vars-list li strong {
  color: var(--text-primary);
  white-space: nowrap;
}

.meta-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.meta-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.meta-value {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* === Buttons === */
.detail-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.btn {
  padding: 0.7rem 1.5rem;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-family: var(--font-family);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-secondary);
  border: 1px solid var(--border-default);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

/* === Toast === */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: 0.75rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.9rem;
  z-index: 200;
  transition: transform 0.3s ease;
  backdrop-filter: blur(10px);
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

/* === Footer === */
footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border-default);
}

/* === Responsive === */
@media (max-width: 768px) {
  .header-inner {
    padding: 0.75rem 1rem;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-subtitle {
    font-size: 0.95rem;
  }

  .hero-stats {
    gap: 2rem;
  }

  .stat-value {
    font-size: 1.5rem;
  }

  main {
    padding: 0 1rem 3rem;
  }

  .grid {
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 0.75rem;
  }

  .card img {
    height: 180px;
  }

  .modal-content {
    grid-template-columns: 1fr;
    max-height: 95vh;
  }

  .modal-details {
    padding: 1.5rem;
  }

  .modal-image-wrap {
    padding: 1rem;
  }

  .meta-grid {
    grid-template-columns: 1fr 1fr;
  }

  .detail-actions {
    flex-direction: column;
  }

  .modal {
    padding: 0.5rem;
  }
}

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

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

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* === Selection === */
::selection {
  background: rgba(102, 126, 234, 0.3);
  color: var(--text-primary);
}