:root {
    --bg-color: #0f172a;
    --sidebar-bg: #1e293b;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --border-color: #334155;
    --success-color: #22c55e;
    --warning-color: #eab308;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    height: 100vh;
    display: flex;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 20px;
    flex-shrink: 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--accent-color);
    text-decoration: none;
}

.filter-group {
    margin-bottom: 25px;
}

.filter-title {
    font-size: 0.85rem;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 10px;
    font-weight: 600;
    letter-spacing: 0.05em;
}

.filter-option {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
    cursor: pointer;
    color: var(--text-main);
}

.filter-option input {
    margin-right: 10px;
    accent-color: var(--accent-color);
}

.stats {
    margin-top: auto;
    font-size: 0.85rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    padding-top: 20px;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.top-bar {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 20px;
    align-items: center;
    background-color: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    z-index: 10;
}

.search-box {
    flex: 1;
    position: relative;
}

.search-input {
    width: 100%;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    padding: 12px 40px 12px 15px;
    border-radius: 8px;
    color: var(--text-main);
    font-size: 1rem;
}

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

.search-icon {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.sort-select {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 10px;
    border-radius: 8px;
    cursor: pointer;
}

/* Asset Grid */
.assets-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.assets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
}

.asset-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
}

.asset-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    border-color: var(--accent-color);
}

.asset-thumb {
    height: 140px;
    background-color: #334155;
    background-image: linear-gradient(45deg, #2d3748 25%, transparent 25%), 
                      linear-gradient(-45deg, #2d3748 25%, transparent 25%), 
                      linear-gradient(45deg, transparent 75%, #2d3748 75%), 
                      linear-gradient(-45deg, transparent 75%, #2d3748 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: rgba(255,255,255,0.8);
    transition: all 0.3s;
}

.asset-card:hover .asset-thumb {
    background-size: 24px 24px;
    color: white;
}

.asset-type-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    background-color: rgba(0,0,0,0.6);
    color: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.asset-info {
    padding: 15px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.asset-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 5px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.asset-author {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.asset-meta {
    margin-top: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.asset-price {
    font-weight: bold;
    color: var(--text-main);
}

.asset-price.free {
    color: var(--success-color);
}

.asset-source {
    font-size: 0.75rem;
    background-color: rgba(255,255,255,0.1);
    padding: 2px 6px;
    border-radius: 4px;
    color: var(--text-muted);
}

.load-more-container {
    text-align: center;
    padding: 40px 0;
}

.btn-load {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.2s;
}

.btn-load:hover {
    background-color: var(--accent-hover);
}

/* Loading State */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    body {
        flex-direction: column;
        overflow: auto;
    }
    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 15px;
    }
    .main-content {
        overflow: visible;
    }
    .assets-container {
        overflow: visible;
    }
}