:root {
            --accent: #00e5ff;
            --glass-bg: rgba(255, 255, 255, 0.15);
            --glass-border: rgba(255, 255, 255, 0.25);
            --text-main: #ffffff;
            --text-muted: rgba(255, 255, 255, 0.75);
        }

        body {
            background:
                linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)),
                url("https://images.unsplash.com/photo-1517836357463-d25dfeac3438");
            background-size: cover;
            background-attachment: fixed;
            color: var(--text-main);
        }

        /* =========================
       FILTER BUTTONS
    ========================= */
        .filter-bar {
            display: flex;
            gap: 12px;
            justify-content: center;
            margin-bottom: 40px;
            flex-wrap: wrap;
        }

        .filter-btn {
            background: transparent;
            border: 1px solid var(--glass-border);
            color: var(--text-main);
            padding: 8px 18px;
            border-radius: 30px;
            cursor: pointer;
            backdrop-filter: blur(8px);
        }

        .filter-btn.active,
        .filter-btn:hover {
            background: var(--accent);
            color: #000;
            border-color: var(--accent);
        }

        /* =========================
       GRID
    ========================= */
        .advanced-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 24px;
        }

        /* =========================
       CARD BASE
    ========================= */
        .app-card {
            position: relative;
            border-radius: 18px;
            overflow: hidden;
            background: var(--glass-bg);
            backdrop-filter: blur(16px);
            border: 1px solid var(--glass-border);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .app-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 25px 60px rgba(0, 0, 0, 0.4);
        }

        .app-card img {
            width: 100%;
            height: 200px;
            object-fit: cover;
        }

        .card-featured {
            grid-column: span 2;
        }

        .card-featured img {
            height: 260px;
        }

        .card-tall img {
            height: 280px;
        }

        /* =========================
       CARD BODY
    ========================= */
        .card-body-custom {
            padding: 22px;
        }

        .card-title-custom {
            font-size: 18px;
            font-weight: 600;
        }

        .card-text-custom {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
            margin: 10px 0 18px;
        }

        /* =========================
       HOVER OVERLAY
    ========================= */
        .card-overlay {
            position: absolute;
            inset: 0;
            background: rgba(0, 0, 0, 0.65);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            opacity: 0;
            transition: opacity 0.3s ease;
        }

        .app-card:hover .card-overlay {
            opacity: 1;
        }

        .overlay-btn {
            background: var(--accent);
            color: #000;
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 14px;
            text-decoration: none;
        }

        /* =========================
       MOBILE FIXES
    ========================= */
        @media (max-width: 768px) {
            .card-featured {
                grid-column: span 1;
            }
        }