[data-theme="dark"] {
    --primary-color: #dc2626;
    --secondary-color: #60a5fa;
    --text-color: #e5e7eb;
    --bg-color: #111827;
    --card-bg: #1f2937;
    --hover-bg: #374151;
    --border-color: #374151;
}

body {
    transition: background-color 0.3s, color 0.3s;
}

.theme-switch {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1000;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s;
}

.theme-switch:hover {
    transform: scale(1.1);
}

.card {
    background-color: var(--card-bg);
    border-color: var(--border-color);
}

.nav-link {
    color: var(--text-color);
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link.active {
    background-color: var(--primary-color);
    color: white;
}

.sidebar {
    transition: all 0.3s ease;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-brand {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.sidebar-brand img {
    height: 32px;
    width: auto;
    object-fit: contain;
}

.nav-menu {
    padding: 1.25rem 0;
    overflow-y: auto;
    height: calc(100vh - 80px);
}

.nav-item {
    padding: 0.25rem 1rem;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 0.875rem 1.25rem;
    color: var(--text-color);
    text-decoration: none;
    border-radius: 0.75rem;
    transition: all 0.2s ease;
    font-size: 1rem;
    font-weight: 500;
    margin: 0.25rem 0;
}

.nav-link:hover {
    background-color: var(--hover-bg);
    color: var(--primary-color);
    transform: translateX(5px);
}

.nav-link.active {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
}

.category-section {
    margin-bottom: 2rem;
    background: var(--card-bg);
    border-radius: 1rem;
    box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
    overflow: hidden;
}

.category-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.category-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 0;
}

.category-description {
    color: #6b7280;
    font-size: 0.875rem;
    margin-top: 0.375rem;
}

.category-content {
    padding: 1.25rem;
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 1rem;
    padding: 0.5rem;
}

.link-card {
    display: flex;
    align-items: center;
    padding: 0.875rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    transition: all 0.2s ease;
    text-decoration: none;
    color: var(--text-color);
    height: 100%;
}

.link-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    border-color: var(--primary-color);
}

.link-icon {
    width: 36px;
    height: 36px;
    min-width: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-color);
    border-radius: 0.5rem;
    margin-right: 0.875rem;
    color: var(--primary-color);
    font-size: 1.125rem;
    overflow: hidden;
    position: relative;
}

.link-icon img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 4px;
}

.link-icon i {
    font-size: 1.25rem;
}

.link-info {
    flex: 1;
    min-width: 0;
}

.link-title {
    font-weight: 600;
    margin: 0;
    font-size: 1rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--text-color);
}

.link-description {
    color: #6b7280;
    font-size: 0.8125rem;
    margin-top: 0.375rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

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

    .main-content {
        margin-left: 0;
        padding: 1rem;
    }

    .mobile-toggle {
        display: block;
        position: fixed;
        top: 1rem;
        left: 1rem;
        z-index: 1000;
        background: var(--primary-color);
        color: white;
        border: none;
        border-radius: 0.5rem;
        padding: 0.5rem;
        cursor: pointer;
    }
}