:root {
  --bg-color: #121212;
  --panel-bg: #1e1e1e;
  --border-color: #333;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0a0;
  --accent-color: #d4af37; /* Vintage gold accent */
  --accent-hover: #f1c40f;
  --font-main: 'Inter', sans-serif;
  --font-serif: 'Playfair Display', serif;
}

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

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

#app {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.app-header {
  height: 60px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  padding: 0 24px;
  background-color: var(--panel-bg);
}

.app-header h1 {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--accent-color);
  flex-shrink: 0;
}

.search-bar {
  margin-left: 40px;
  flex-grow: 1;
  max-width: 400px;
}

.search-bar input {
  width: 100%;
  background-color: #2a2a2a;
  border: 1px solid #444;
  color: #fff;
  padding: 8px 16px;
  border-radius: 20px;
  outline: none;
  font-family: var(--font-main);
}

.search-bar input:focus {
  border-color: var(--accent-color);
}

.app-container {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 300px;
  background-color: var(--panel-bg);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-secondary);
  letter-spacing: 1px;
}

.thumbnail-grid {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  align-content: start; /* Prevents grid from squashing rows */
}

.thumb-item {
  cursor: pointer;
  border-radius: 4px;
  overflow: hidden;
  border: 2px solid transparent;
  transition: all 0.2s ease;
  position: relative;
  background: #000;
  /* Bulletproof aspect ratio hack */
  padding-bottom: 66.66%; 
  height: 0;
}

.thumb-item img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  opacity: 0.8;
  transition: opacity 0.2s ease;
}

.thumb-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
}

.thumb-item:hover img {
  opacity: 1;
}

.thumb-item.active {
  border-color: var(--accent-color);
}

.thumb-item.active img {
  opacity: 1;
}

/* Main Viewer */
.main-viewer {
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  background: radial-gradient(circle at center, #2a2a2a 0%, #121212 100%);
}

.loading-bar {
  position: absolute;
  top: 0;
  left: 0;
  height: 3px;
  background-color: var(--accent-color);
  width: 0%;
  z-index: 100;
  opacity: 0;
  transition: width 0.3s ease, opacity 0.3s ease;
  box-shadow: 0 0 10px var(--accent-color);
}

.viewer-controls {
  position: absolute;
  top: 24px;
  right: 24px;
  z-index: 10;
  display: flex;
  gap: 16px;
}

.zoom-controls {
  background: rgba(30, 30, 30, 0.8);
  backdrop-filter: blur(8px);
  border-radius: 8px;
  padding: 4px;
  border: 1px solid var(--border-color);
  display: flex;
  gap: 4px;
}

.viewer-controls button {
  background: transparent;
  border: none;
  color: var(--text-primary);
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--font-main);
  font-size: 11px;
  font-weight: 500;
  transition: all 0.2s;
}

.viewer-controls button:hover {
  background: rgba(255, 255, 255, 0.1);
}

.image-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 40px;
}

.card-display {
  display: flex;
  gap: 24px;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  transition: transform 0.3s ease;
}

.card-display.layout-landscape {
  flex-direction: column;
}

.card-display.layout-portrait {
  flex-direction: row;
}

.card-display img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  box-shadow: 0 20px 50px rgba(0,0,0,0.6);
  border-radius: 4px;
}

.card-display.layout-landscape img {
  max-height: calc(50% - 12px);
}

.card-display.layout-portrait img {
  max-width: calc(50% - 12px);
  max-height: 100%;
}

/* Right Panel */
.details-panel {
  width: 320px;
  background-color: var(--panel-bg);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.tabs {
  display: flex;
  border-bottom: 1px solid var(--border-color);
}

.tab {
  flex: 1;
  background: none;
  border: none;
  color: var(--text-secondary);
  padding: 16px 0;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  letter-spacing: 1px;
}

.tab.active {
  color: var(--text-primary);
  border-bottom: 2px solid var(--accent-color);
}

.tab-content {
  display: none;
  padding: 24px;
  overflow-y: auto;
  flex: 1;
}

.tab-content.active {
  display: block;
}

.metadata-group {
  margin-bottom: 24px;
}

.metadata-group label {
  display: block;
  font-size: 11px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.metadata-group p {
  font-size: 14px;
  line-height: 1.5;
}

#metaTitle {
  font-family: var(--font-serif);
  font-size: 18px;
  color: var(--accent-color);
}

.transcription-text {
  font-family: 'Playfair Display', serif;
  font-size: 16px;
  line-height: 1.8;
  font-style: italic;
  white-space: pre-wrap;
  color: #ddd;
}

/* Mobile Responsiveness */
@media (max-width: 1050px) {
  .app-container {
    display: grid;
    grid-template-columns: 100px 1fr;
    grid-template-rows: 1fr 25vh;
  }
  
  .sidebar {
    grid-column: 1;
    grid-row: 1 / 3;
    width: 100%;
    height: 100%;
    border-right: 1px solid var(--border-color);
    border-top: none;
    border-bottom: none;
  }

  .main-viewer {
    grid-column: 2;
    grid-row: 1;
    min-height: 0;
  }

  .details-panel {
    grid-column: 2;
    grid-row: 2;
    width: 100%;
    border-left: none;
    border-top: 1px solid var(--border-color);
  }

  .thumbnail-grid {
    grid-template-columns: 1fr;
    padding: 8px;
    gap: 8px;
  }

  .image-container {
    padding: 16px;
  }

  .viewer-controls {
    top: 12px;
    right: 12px;
  }
  
  .tabs {
    padding: 8px 12px 0;
  }
  
  .tab-content {
    padding: 12px;
    overflow-y: auto;
  }
}