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

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent: #58a6ff;
    --border: #30363d;
    --radius: 8px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    flex-wrap: wrap;
    min-height: 100vh;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
}

.hamburger {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 24px;
    cursor: pointer;
    padding: 4px 8px;
}

.search-bar {
    flex: 1;
}

.search-bar input {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
}

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

.sort-pills {
    display: flex;
    gap: 4px;
    white-space: nowrap;
}

.sort-pills .pill {
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: 20px;
    background: transparent;
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.15s;
}

.sort-pills .pill:hover {
    color: var(--text-primary);
    border-color: var(--text-secondary);
}

.sort-pills .pill.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.sidebar {
    position: fixed;
    top: 56px;
    left: 0;
    bottom: 0;
    width: 220px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    padding: 16px 0;
    z-index: 90;
    transition: transform 0.3s ease;
}

.sidebar h2 {
    padding: 0 16px 12px;
    font-size: 14px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sidebar ul {
    list-style: none;
}

.sidebar li {
    padding: 6px 16px;
    cursor: pointer;
    font-size: 14px;
    color: var(--text-primary);
    transition: background 0.15s;
}

.sidebar li:hover {
    background: var(--bg-tertiary);
}

.sidebar li.active {
    color: var(--accent);
    font-weight: 600;
    background: var(--bg-tertiary);
}

.sidebar li .count {
    float: right;
    color: var(--text-secondary);
    font-size: 12px;
}

.gallery {
    margin-left: 220px;
    margin-top: 56px;
    flex: 1;
    padding: 16px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
    align-content: start;
}

.card {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

.card img,
.card video {
    width: 100%;
    height: 200px;
    display: block;
    object-fit: cover;
}

.card .info {
    padding: 6px 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card .filename {
    font-size: 12px;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
}

.card-actions {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
}

.card .copy-btn,
.card .share-btn {
    background: none;
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 2px 6px;
    font-size: 12px;
    display: flex;
    align-items: center;
    gap: 3px;
    transition: all 0.15s;
    white-space: nowrap;
}

.card .copy-btn:hover,
.card .share-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.card .copy-btn.copied {
    color: #3fb950;
    border-color: #3fb950;
}

.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(80px);
    background: #238636;
    color: #fff;
    padding: 10px 20px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 200;
    pointer-events: none;
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    color: var(--text-secondary);
    font-size: 16px;
}

.lightbox-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.75);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    backdrop-filter: blur(4px);
}

.lightbox-card {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    max-width: 700px;
    width: 100%;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 8px 32px rgba(0,0,0,0.5);
}

.lightbox-nav {
    position: absolute;
    top: 40%;
    transform: translateY(-50%);
    background: rgba(0,0,0,0.5);
    color: #fff;
    border: none;
    font-size: 32px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: background 0.15s;
    line-height: 1;
}

.lightbox-nav:hover {
    background: rgba(0,0,0,0.8);
}

.lightbox-prev {
    left: -50px;
}

.lightbox-next {
    right: -50px;
}

.lightbox-media {
    max-width: 100%;
    max-height: 75vh;
    object-fit: contain;
    display: block;
    background: #000;
}

.lightbox-actions {
    padding: 10px 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-top: 1px solid var(--border);
}

.lightbox-name {
    flex: 1;
    font-size: 13px;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.lightbox-actions .copy-btn,
.lightbox-actions .share-btn {
    background: none;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 5px 10px;
    font-size: 13px;
    transition: all 0.15s;
    white-space: nowrap;
}

.lightbox-actions .copy-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.lightbox-actions .share-btn:hover {
    color: #3fb950;
    border-color: #3fb950;
}

@media (max-width: 768px) {
    .hamburger {
        display: block;
    }

    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .gallery {
        margin-left: 0;
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 8px;
        padding: 12px;
    }

    .sort-pills .pill {
        padding: 4px 8px;
        font-size: 12px;
    }

    .lightbox-overlay {
        padding: 12px;
    }

    .lightbox-card {
        max-width: 100%;
    }

    .lightbox-nav {
        font-size: 24px;
        width: 32px;
        height: 32px;
    }

    .lightbox-prev {
        left: 4px;
    }

    .lightbox-next {
        right: 4px;
    }
}

@media (max-width: 480px) {
    .gallery {
        grid-template-columns: repeat(2, 1fr);
        gap: 6px;
    }
}