:root {
    --bg-color: #121212;
    --surface-color: #1e1e1e;
    --primary-color: #00bfff; /* Deep Sky Blue */
    --text-color: #e0e0e0;
    --timeline-height: 160px;
    --transition-speed: 0.3s;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow: hidden; /* Prevent body scroll */
}

#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
}

/* Viewer Area */
#viewer-container {
    position: relative;
    flex: 1; /* Takes remaining space */
    background: #000;
    overflow: hidden;
    transition: all var(--transition-speed) ease;
}

#canvas-wrapper {
    width: 100%;
    height: 100%;
}

canvas {
    display: block;
    outline: none;
}

/* UI Overlay */
.ui-overlay {
    position: absolute;
    padding: 1rem;
    pointer-events: none; /* Let clicks pass through to canvas */
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    z-index: 10;
    background: transparent;
}

.top-bar {
    top: 0;
    left: 0;
    transition: transform 0.3s ease-in-out;
}

.top-bar.hidden {
    transform: translateY(-100%);
    display: flex !important; /* Override generic hidden */
}

.title {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 300;
    letter-spacing: 2px;
    pointer-events: auto;
}

.controls {
    display: flex;
    gap: 10px;
    pointer-events: auto;
}

.icon-btn {
    background: rgba(255,255,255,0.25);
    border: 1px solid rgba(255,255,255,0.4);
    color: #fff;
    padding: 10px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.4);
}

.icon-btn:hover {
    background: var(--primary-color);
    color: #121212;
    transform: scale(1.1);
    box-shadow: 0 0 15px var(--primary-color);
    border-color: var(--primary-color);
}

/* Splat Info Overlay */
.splat-info-overlay {
    position: absolute;
    bottom: 40px;
    left: 40px;
    max-width: 500px;
    background: transparent;
    padding: 0;
    pointer-events: auto; /* Allow hover */
    z-index: 15;
    transition: opacity 0.5s ease, transform 0.5s ease;
    text-shadow: 0 2px 4px rgba(0,0,0,0.9);
    border-left: none;
}

.splat-info-overlay.hidden {
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none; /* Disable events when hidden */
}

.splat-info-overlay h2 {
    margin: 0 0 10px 0;
    font-size: 2rem; /* Smaller title */
    font-weight: 200;
    line-height: 1.1;
    letter-spacing: -1px;
    color: #fff;
    text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

.info-meta {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 15px;
    font-weight: 300;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.info-desc {
    font-size: 1.1rem;
    line-height: 1.6;
    margin: 0; /* Reset margin for clean transition */
    color: rgba(255, 255, 255, 0.9);
    max-width: 600px;
    
    /* Hidden by default */
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.splat-info-overlay:hover .info-desc {
    opacity: 1;
    max-height: 300px;
    margin-top: 15px;
}

.info-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 5px;
}

/* Timeline */
#timeline-container {
    height: var(--timeline-height);
    background: var(--surface-color);
    border-top: 1px solid #333;
    overflow-x: auto;
    overflow-y: hidden;
    position: relative;
    z-index: 20;
    /* Custom scrollbar styling */
    scrollbar-width: thin;
    scrollbar-color: #444 #1e1e1e;
    
    /* Flex alignment for buttons */
    display: flex;
    align-items: center;
}

#timeline-container::-webkit-scrollbar {
    height: 8px;
}
#timeline-container::-webkit-scrollbar-track {
    background: #1e1e1e;
}
#timeline-container::-webkit-scrollbar-thumb {
    background-color: #444;
    border-radius: 4px;
}

.timeline-track {
    display: flex;
    padding: 20px;
    gap: 20px;
    min-width: min-content;
    align-items: center;
    
    /* Ensure scrolling works */
    overflow-x: auto;
    flex: 1; /* Take up available space between buttons */
    height: 100%;
    scrollbar-width: none; /* Hide default scrollbar in track if desired, or keep */
}

/* Hide scrollbar on track specifically if using buttons mainly, but keep access */
.timeline-track::-webkit-scrollbar {
    height: 0; /* Hide scrollbar inside track */
}

/* Scroll Nav Buttons */
.scroll-nav-btn {
    background: rgba(0,0,0,0.5);
    border: none;
    color: white;
    width: 40px;
    height: 100%;
    cursor: pointer;
    z-index: 25;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
    position: sticky; /* Keeps them visible if container scrolls? No, container flexes */
    flex-shrink: 0; /* Prevent shrinking */
}

.scroll-nav-btn:hover {
    background: rgba(255,255,255,0.1);
}

.scroll-nav-btn.hidden {
    display: none;
}

.timeline-item {
    min-width: 200px;
    height: 100px;
    background: #2a2a2a;
    border-radius: 8px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    border: 2px solid transparent;
    transition: transform 0.2s, border-color 0.2s;
    display: flex;
    flex-direction: column;
}

.timeline-item:hover {
    transform: translateY(-5px);
    border-color: rgba(255,255,255,0.3);
}

.timeline-item.active {
    border-color: var(--primary-color);
    box-shadow: 0 0 20px rgba(0, 191, 255, 0.4);
}

.timeline-thumb {
    width: 100%;
    height: 100%;
    background-color: #333;
    background-size: cover;
    background-position: center;
    position: relative;
    transition: transform 0.3s ease;
}

.timeline-title-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 8px;
    font-size: 0.8rem;
    text-align: center;
    opacity: 0;
    transition: opacity 0.2s ease-in-out;
    pointer-events: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    backdrop-filter: blur(2px);
}

.timeline-item:hover .timeline-title-overlay {
    opacity: 1;
}

.timeline-item:hover .timeline-thumb {
    transform: scale(1.05);
}

.timeline-info {
    display: none;
}

/* Chips in timeline */
.timeline-tags {
    display: flex;
    gap: 4px;
    margin-top: 2px;
}
.tag-chip {
    font-size: 0.6rem;
    background: rgba(255,255,255,0.1);
    padding: 1px 4px;
    border-radius: 4px;
}

/* Grid View Overlay */
#grid-view {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(18, 18, 18, 0.95);
    backdrop-filter: blur(10px);
    z-index: 100;
    display: flex;
    flex-direction: column;
    padding: 2rem;
    transition: opacity 0.3s;
}

#grid-view.hidden {
    display: none !important;
    opacity: 0;
    pointer-events: none;
}

.grid-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.filter-bar {
    display: flex;
    gap: 1rem;
    flex: 1;
    justify-content: center;
}

.filter-select {
    background: #333;
    color: #fff;
    border: 1px solid #444;
    padding: 8px 12px;
    border-radius: 4px;
    outline: none;
    font-family: inherit;
}

.filter-select:focus {
    border-color: var(--primary-color);
}

.grid-content {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    overflow-y: auto;
    padding-bottom: 2rem;
    flex: 1;
    min-height: 0;
    padding: 0 2rem 2rem 2rem;
    scrollbar-gutter: stable; /* Prevent layout shift when scrollbar appears */
}

/* Custom scrollbar for grid content */
.grid-content::-webkit-scrollbar {
    width: 8px;
}
.grid-content::-webkit-scrollbar-track {
    background: #1e1e1e;
}
.grid-content::-webkit-scrollbar-thumb {
    background-color: #444;
    border-radius: 4px;
}

.grid-item {
    background: var(--surface-color);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.2s;
    display: flex;
    flex-direction: column;
}

.grid-item:hover {
    transform: scale(1.02);
}

.grid-thumb {
    width: 100%;
    height: 200px;
    background-color: #333;
    background-size: cover;
    background-position: center;
    flex-shrink: 0;
    position: relative;
}

.thumb-title-overlay {
    position: absolute;
    bottom: 12px;
    right: 12px;
    left: 12px;
    width: auto;
    background: rgba(0, 0, 0, 0.75);
    color: white;
    padding: 6px 10px;
    font-size: 0.75rem;
    border-radius: 6px;
    opacity: 0;
    transition: opacity 0.2s ease-in-out;
    pointer-events: none;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    box-shadow: 0 4px 6px rgba(0,0,0,0.4);
    z-index: 50;
    backdrop-filter: blur(4px);
    display: block;
    text-align: center;
}

/* Trigger on hovering the whole item, not just the thumb */
.grid-item:hover .thumb-title-overlay {
    opacity: 1;
}

.grid-info {
    padding: 1rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.grid-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: #aaa;
    margin-bottom: 0.5rem;
}

.grid-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: auto;
    padding-top: 1rem;
}

.tag-badge {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    font-size: 0.8rem;
    padding: 4px 12px;
    border-radius: 20px;
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255,255,255,0.2);
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

/* Loader */
.loader {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--primary-color);
    font-size: 1.2rem;
    z-index: 5;
    background: rgba(0,0,0,0.5);
    padding: 10px 20px;
    border-radius: 20px;
}

.loader.hidden {
    display: none;
}

.hidden {
    display: none !important;
    opacity: 0;
    pointer-events: none;
}

/* Responsive adjustments */
@media (max-width: 600px) {
    .timeline-item {
        min-width: 150px;
    }
    .grid-header {
        flex-direction: column;
        align-items: flex-start;
        margin-bottom: 1rem;
        position: relative;
        padding-right: 50px; /* Space for close button */
    }
    
    #btn-close-grid {
        position: absolute;
        top: 0;
        right: 0;
    }

    .filter-bar {
        flex-direction: column;
        gap: 0.5rem;
        width: 100%;
    }
    
    .filter-select {
        width: 100%;
    }
    
    #grid-view {
        padding: 1rem;
    }

    .grid-content {
        padding: 0;
        grid-template-columns: repeat(2, 1fr); /* 2 columns for mobile */
        gap: 10px;
    }
    
    .grid-thumb {
        height: 150px; /* Adjusted height for 2-column layout */
    }
    
    .splat-info-overlay {
        left: 10px;
        right: 10px;
        bottom: 10px;
        max-width: none;
    }
    
    .scroll-nav-btn {
        width: 30px;
    }
}