:root {
            --color-bg: #0f172a;
            --color-surface: #1e293b;
            --color-surface-light: #334155;
            --color-border: #334155;
            --color-text-primary: #e2e8f0;
            --color-text-secondary: #94a3b8;
            --color-accent: #0ea5e9;
            --gradient-start: #38bdf8;
            --gradient-end: #6366f1;
        }

        *, *::before, *::after {
            box-sizing: border-box;
        }

        body {
            margin: 0;
            background-color: var(--color-bg);
            color: var(--color-text-primary);
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        .container {
            width: 100%;
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding: 2rem 1rem;
        }

        .app-header {
            text-align: center;
            margin: 2rem 0 4rem 0;
        }

        .app-title {
            font-size: 2.5rem;
            font-weight: 800;
            color: transparent;
            background-clip: text;
            -webkit-background-clip: text;
            background-image: linear-gradient(to right, var(--gradient-start), var(--gradient-end));
        }

        .app-subtitle {
            margin-top: 1rem;
            font-size: 1.2rem;
            line-height:1.4em;
            color: var(--color-text-secondary);
            max-width: 56rem;
            margin-left: auto;
            margin-right: auto;
        }

        .filter-menu {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 1rem;
            margin-bottom: 3rem;
        }

        .filter-btn {
            background-color: var(--color-surface-light);
            color: var(--color-text-primary);
            border: 1px solid transparent;
            border-radius: 9999px;
            padding: 0.75rem 1.5rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
        }

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

        .filter-btn.active {
            background-color: var(--color-accent);
            color: white;
            box-shadow: 0 0 30px 0 rgba(14, 165, 233, 0.3);
        }

        .tools-grid {
            display: grid;
            gap: 2rem;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        }

        .ai-tool-card {
            background-color: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: 0.75rem;
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            display: block; /* Default state for filtering */
        }

        .ai-tool-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 0 25px 0 rgba(14, 165, 233, 0.2);
        }
        
        .ai-tool-card__preview {
            width: 100%;
            height: 180px;
            object-fit: cover;
            object-position: top;
            border-bottom: 1px solid var(--color-border);
        }

        .ai-tool-card__content {
            padding: 1.5rem;
        }

        .ai-tool-card__header {
            display: flex;
            align-items: center;
            margin-bottom: 1rem;
        }

        .ai-tool-card__logo-wrapper {
            width: 48px;
            height: 48px;
            padding: 0.5rem;
            background-color: var(--color-surface-light);
            border-radius: 0.5rem;
            margin-right: 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }

        .ai-tool-card__logo-wrapper svg {
            width: 100%;
            height: 100%;
        }

        .ai-tool-card__logo-wrapper img {
            width: 100%;
            height: 100%;
        }

        .ai-tool-card__name {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--color-text-primary);
            margin: 0;
        }

        .ai-tool-card__description {
            color: var(--color-text-secondary);
            font-size: 0.9rem;
            line-height: 1.5;
            margin-bottom: 1.5rem;
            min-height: 75px;
        }

        .ai-tool-card__link {
            display: block;
            width: 100%;
            text-align: center;
            background-color: var(--color-surface-light);
            color: var(--color-text-primary);
            font-weight: 600;
            padding: 0.75rem;
            border-radius: 0.5rem;
            text-decoration: none;
            transition: background-color 0.3s ease, color 0.3s ease;
        }

        .ai-tool-card__link:hover {
            background-color: var(--color-accent);
            color: white;
        }

        .app-footer {
            text-align: center;
            padding: 2rem 0;
            margin-top: 4rem;
            border-top: 1px solid var(--color-border);
            color: #64748b;
        }

        .logo-pad {
            justify-content: center; 
            align-items: center; 
            text-align:center; 
        }
        .logo-container {
            display: flex;
            justify-content: center;   /* horizontal zentrieren */
            align-items: center;       /* vertikal zentrieren */
        }
        .logo-container img {
            max-width: 100%;
            height: auto;
        }