* { box-sizing: border-box; }
        html { overflow-x: clip; }
        body {
            overflow-x: clip;
            margin: 0;
            font-family: 'Inter', 'Plus Jakarta Sans', sans-serif;
            background-color: #ffffff;
            color: #334155;
            scroll-behavior: smooth;
        }

        img { max-width: 100%; height: auto; }

        /* ================= TUTORIAL / VIDEO CARDS ================= */
        .breadcrumb-nav { margin-bottom: 2.5rem; }
        .breadcrumb-nav a { color: #64748b; text-decoration: none; font-size: 0.875rem; }
        .breadcrumb-nav a:hover { color: #007031; }
        .breadcrumb-nav span { color: #9ca3af; margin: 0 0.5rem; }
        .breadcrumb-nav .active { color: #16a34a; font-weight: 600; font-size: 0.875rem; }

        .tutorial-heading { color: #16a34a; }

        .video-card {
            background: #f1f5f9;
            border-radius: 12px;
            padding: 18px;
            transition: all 0.3s ease;
            border: 1px solid #e2e8f0;
            height: 100%; /* Ensures cards in grid rows are equal height */
        }
        .video-card:hover {
            background: #e9eef5;
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.06);
        }
        .video-card h3 {
            text-align: center;
            font-weight: 700;
            color: #1f2a44;
            font-size: 15px;
            margin-bottom: 14px;
        }

        .video-thumbnail {
            position: relative;
            padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
            height: 0;
            border-radius: 8px;
            overflow: hidden;
            background: #cbd5e1;
        }
        .video-thumbnail iframe {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            border: 0;
        }

        /* ================= FLOATING BUTTONS ================= */
        .back-to-top {
            position: fixed;
            bottom: 1.5rem;
            left: 1.5rem;
            width: 2.75rem;
            height: 2.75rem;
            background-color: #00873c;
            color: #ffffff;
            border-radius: 0.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
            transform: translateY(5rem);
            opacity: 0;
            transition: all 0.3s ease;
            z-index: 1050;
            border: none;
            cursor: pointer;
        }
        .back-to-top.show {
            transform: translateY(0);
            opacity: 1;
        }
        .back-to-top:hover { background-color: #005a27; color: #ffffff; }

        .whatsapp-float {
            position: fixed;
            bottom: 1.5rem;
            right: 1.5rem;
            padding: 0.625rem 1rem;
            background-color: #25d366;
            color: #ffffff;
            border-radius: 50rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
            transition: all 0.3s ease;
            z-index: 1050;
            text-decoration: none;
        }
        .whatsapp-float:hover {
            background-color: #128c7e;
            color: #ffffff;
            transform: scale(1.05);
        }
        .whatsapp-float span { font-size: 0.875rem; font-weight: 600; letter-spacing: 0.025em; }
        .whatsapp-float i { font-size: 1.5rem; }

        /* Animation */
        @keyframes pulse {
            0%, 100% { transform: scale(1); opacity: 1; }
            50% { transform: scale(1.1); opacity: 0.8; }
        }
        .animate-pulse-icon { animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite; }