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

:root {
    --bg: #ffffff;
    --text: #1a1a1a;
    --text-muted: #6b6b6b;
    --border: #e0e0e0;
    --accent: #1a1a1a;
    --surface: #fafafa;
    --error: #b33a3a;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #121212;
        --text: #e8e8e8;
        --text-muted: #999999;
        --border: #2a2a2a;
        --accent: #e8e8e8;
        --surface: #1a1a1a;
        --error: #e08080;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    padding: 2rem 1rem;
    line-height: 1.5;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
}

header {
    margin-bottom: 1.5rem;
}

h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.subtitle {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.tabs {
    display: flex;
    gap: 0.25rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 1.5rem;
}

.tab-btn {
    padding: 0.5rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: color 0.15s ease, border-color 0.15s ease;
}

.tab-btn:hover {
    color: var(--text);
}

.tab-btn.active {
    color: var(--text);
    border-bottom-color: var(--text);
}

.controls {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    cursor: pointer;
    border-radius: 4px;
    font-size: 0.875rem;
    transition: border-color 0.15s ease, background 0.15s ease;
}

.btn:hover {
    border-color: var(--text);
}

.btn.primary {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
}

.btn.primary:hover {
    opacity: 0.85;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.search-box {
    max-width: 320px;
    margin-bottom: 1rem;
}

.search-box input {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    border-radius: 4px;
    font-size: 0.875rem;
}

.search-box input:focus {
    outline: none;
    border-color: var(--text);
}

.per-page-select {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.per-page-select select {
    padding: 0.3rem 0.5rem;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    border-radius: 4px;
    font-size: 0.875rem;
}

.per-page-select select:focus {
    outline: none;
    border-color: var(--text);
}

.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
    gap: 0.5rem;
    min-height: 100px;
}

.empty-msg {
    grid-column: 1/-1;
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.asset-card {
    aspect-ratio: 1;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    padding: 0.75rem;
    text-align: center;
    gap: 0.4rem;
    transition: border-color 0.15s ease;
    position: relative;
}

.asset-card:hover {
    border-color: var(--text);
}

.asset-card.selected {
    border-color: var(--text);
    background: var(--border);
}

.asset-image {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.asset-name {
    font-size: 0.7rem;
    color: var(--text-muted);
    word-break: break-all;
}

.checkbox-input {
    position: absolute;
    top: 0.4rem;
    right: 0.4rem;
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--text);
}

.asset-preview {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
    min-width: 180px;
    text-align: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease;
    z-index: 1000;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.asset-preview.active {
    opacity: 1;
    pointer-events: auto;
}

.asset-preview img {
    width: 96px;
    height: 96px;
    object-fit: contain;
    margin-bottom: 0.75rem;
}

.asset-preview-name {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.6rem;
    word-break: break-all;
}

.preview-actions {
    display: flex;
    gap: 0.4rem;
    flex-direction: column;
}

.preview-btn {
    padding: 0.4rem 0.75rem;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    cursor: pointer;
    border-radius: 4px;
    font-size: 0.8rem;
}

.preview-btn:hover {
    border-color: var(--text);
}

.stats {
    color: var(--text-muted);
    margin-top: 1.5rem;
    font-size: 0.8rem;
}

.stats span {
    color: var(--text);
    font-weight: 600;
}

.pagination {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

.page-btn {
    min-width: 32px;
    height: 32px;
    padding: 0 0.5rem;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    cursor: pointer;
    border-radius: 4px;
    font-size: 0.8rem;
}

.page-btn:hover:not(:disabled):not(.active) {
    border-color: var(--text);
}

.page-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--bg);
}

.page-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.page-ellipsis {
    color: var(--text-muted);
    padding: 0 0.15rem;
    font-size: 0.8rem;
}

.toast {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg);
    border: 1px solid var(--text);
    color: var(--text);
    padding: 0.65rem 1rem;
    border-radius: 4px;
    z-index: 1001;
    pointer-events: none;
    transition: transform 0.2s ease;
    font-size: 0.85rem;
}

.toast.error {
    border-color: var(--error);
    color: var(--error);
}

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

@media (max-width: 640px) {
    h1 {
        font-size: 1.25rem;
    }

    .tabs {
        overflow-x: auto;
    }

    .gallery {
        grid-template-columns: repeat(auto-fill, minmax(75px, 1fr));
        gap: 0.4rem;
    }

    .asset-preview {
        bottom: 1rem;
        right: 1rem;
        min-width: 150px;
        padding: 1rem 0.85rem;
    }

    .asset-preview img {
        width: 80px;
        height: 80px;
    }

    .page-btn {
        min-width: 28px;
        height: 28px;
        font-size: 0.75rem;
    }
}