/* Custom Styles for GEM Summit Photo Gallery */
@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

:root {
  --bg-primary: #0b0f19;
  --bg-card: rgba(22, 30, 49, 0.75);
  --bg-card-hover: rgba(30, 42, 69, 0.9);
  --border-color: rgba(255, 255, 255, 0.08);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent-gold: #f59e0b;
  --accent-cyan: #06b6d4;
  --accent-blue: #3b82f6;
  --gradient-gem: linear-gradient(135deg, #06b6d4 0%, #3b82f6 50%, #8b5cf6 100%);
  --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.05) 0%, rgba(0, 0, 0, 0.4) 100%);
  --shadow-lg: 0 20px 30px -10px rgba(0, 0, 0, 0.5);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(6, 182, 212, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(139, 92, 246, 0.08) 0%, transparent 40%);
  background-attachment: fixed;
}

/* Glassmorphism Navbar & Header */
.navbar-custom {
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1030;
}

.hero-banner {
  padding: 3rem 1rem 2rem;
  text-align: center;
  position: relative;
}

.gem-badge {
  background: linear-gradient(135deg, rgba(6, 182, 212, 0.15), rgba(139, 92, 246, 0.15));
  border: 1px solid rgba(6, 182, 212, 0.3);
  color: #38bdf8;
  padding: 0.4rem 1.2rem;
  border-radius: 50rem;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  display: inline-block;
}

.hero-title {
  font-size: clamp(2rem, 4vw, 3.25rem);
  font-weight: 800;
  background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-top: 0.75rem;
  margin-bottom: 0.5rem;
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 650px;
  margin: 0 auto;
}

/* Days Thumbnail Cards */
.day-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 1.25rem;
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
  height: 100%;
  display: flex;
  flex-direction: column;
  position: relative;
}

.day-card:hover {
  transform: translateY(-8px);
  background: var(--bg-card-hover);
  border-color: rgba(6, 182, 212, 0.4);
  box-shadow: 0 20px 40px -15px rgba(6, 182, 212, 0.25);
}

.day-card-img-wrapper {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: #111827;
}

.day-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.day-card-overlay {
  position: absolute;
  inset: 0;
  background: var(--gradient-card);
  display: flex;
  align-items: flex-end;
  padding: 1.25rem;
}

.photo-count-badge {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: rgba(11, 15, 25, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
  padding: 0.35rem 0.85rem;
  border-radius: 50rem;
  font-size: 0.8rem;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.day-badge-chip {
  position: absolute;
  top: 1rem;
  left: 1rem;
  background: var(--gradient-gem);
  color: #ffffff;
  padding: 0.35rem 0.85rem;
  border-radius: 50rem;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.4);
}

.day-card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.day-card-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: #ffffff;
  margin-bottom: 0.35rem;
}

.day-card-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1.25rem;
  line-height: 1.5;
}

.day-card-btn {
  margin-top: auto;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: #38bdf8;
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border-radius: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: var(--transition);
}

.day-card:hover .day-card-btn {
  background: var(--gradient-gem);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 4px 15px rgba(6, 182, 212, 0.3);
}

/* Single Day Gallery View Header & Action Controls */
.gallery-sticky-header {
  position: sticky;
  top: 60px;
  background: rgba(11, 15, 25, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  z-index: 1020;
}

.btn-back {
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 0.65rem;
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  font-weight: 600;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-back:hover {
  background: rgba(255, 255, 255, 0.18);
  color: #ffffff;
  transform: translateX(-3px);
}

/* Day Tabs Selector */
.nav-pills-custom .nav-link {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-radius: 0.65rem;
  padding: 0.45rem 1rem;
  font-weight: 600;
  font-size: 0.875rem;
  transition: var(--transition);
  margin-right: 0.35rem;
}

.nav-pills-custom .nav-link.active,
.nav-pills-custom .nav-link:hover {
  background: var(--gradient-gem);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(6, 182, 212, 0.25);
}

/* Search Box & Controls */
.search-input-group .form-control {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  color: #ffffff;
  border-radius: 0.65rem;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.search-input-group .form-control:focus {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-cyan);
  box-shadow: 0 0 0 0.25rem rgba(6, 182, 212, 0.2);
  color: #ffffff;
}

.search-input-group .input-group-text {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: 0.65rem 0 0 0.65rem;
}

/* Image Item Card in Grid */
.photo-item {
  position: relative;
  border-radius: 0.85rem;
  overflow: hidden;
  background: #1e293b;
  aspect-ratio: 4 / 3;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  transition: var(--transition);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.photo-item:hover {
  transform: scale(1.03);
  box-shadow: 0 12px 25px rgba(0, 0, 0, 0.5);
  border-color: rgba(6, 182, 212, 0.5);
  z-index: 2;
}

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

.photo-item:hover img {
  transform: scale(1.08);
}

.photo-item-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(11, 15, 25, 0.85) 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 0.75rem;
}

.photo-item:hover .photo-item-overlay {
  opacity: 1;
}

.photo-filename {
  font-size: 0.75rem;
  font-weight: 600;
  color: #e2e8f0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.photo-actions {
  display: flex;
  gap: 0.4rem;
  margin-top: 0.25rem;
}

.btn-photo-action {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(4px);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  font-size: 0.75rem;
  transition: var(--transition);
}

.btn-photo-action:hover {
  background: var(--accent-cyan);
  color: #ffffff;
  transform: scale(1.1);
}

/* Lightbox Modal Customization */
.lightbox-modal .modal-content {
  background: rgba(7, 10, 18, 0.96);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  color: #ffffff;
}

.lightbox-img-container {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  max-height: 80vh;
  overflow: hidden;
}

.lightbox-img {
  max-width: 100%;
  max-height: 78vh;
  object-fit: contain;
  border-radius: 0.5rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.8);
  transition: transform 0.3s ease;
}

.lightbox-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  cursor: pointer;
  transition: var(--transition);
  z-index: 10;
}

.lightbox-nav-btn:hover {
  background: var(--gradient-gem);
  border-color: transparent;
  color: #ffffff;
  transform: translateY(-50%) scale(1.1);
}

.lightbox-prev {
  left: 1rem;
}

.lightbox-next {
  right: 1rem;
}

/* View transitions */
.fade-in {
  animation: fadeIn 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

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

/* Scroll to top button */
.btn-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  background: var(--gradient-gem);
  color: #ffffff;
  border: none;
  box-shadow: 0 10px 20px rgba(6, 182, 212, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 1000;
}

.btn-top.show {
  opacity: 1;
  visibility: visible;
}

.btn-top:hover {
  transform: translateY(-4px) scale(1.05);
}

/* Loading Skeleton */
.skeleton {
  background: linear-gradient(90deg, #1e293b 25%, #334155 50%, #1e293b 75%);
  background-size: 200% 100%;
  animation: loading 1.5s infinite;
}

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