/* ===== PAGE HEADER ===== */
        .page-header {
            background: linear-gradient(135deg, #0A2540 0%, #005C97 50%, #0A2540 100%);
            padding: 140px 0 60px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .page-header::before {
            content: '';
            position: absolute;
            top: 0; left: 0; width: 100%; height: 100%;
            background: radial-gradient(circle at 20% 80%, rgba(0,180,216,0.15), transparent 50%),
                        radial-gradient(circle at 80% 20%, rgba(242,169,0,0.1), transparent 50%);
        }
        .page-header * { position: relative; z-index: 2; }

        /* ===== FILTER TABS ===== */
        .filter-tabs {
            display: flex;
            justify-content: center;
            gap: 12px;
            flex-wrap: wrap;
            margin-bottom: 40px;
        }
        .filter-tab {
            padding: 10px 24px;
            border-radius: 50px;
            border: 2px solid #dee2e6;
            background: #fff;
            color: #0A2540;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            font-family: 'Montserrat', sans-serif;
        }
        .filter-tab:hover {
            border-color: #00B4D8;
            color: #00B4D8;
            transform: translateY(-2px);
        }
        .filter-tab.active {
            background: #0A2540;
            color: #fff;
            border-color: #0A2540;
            box-shadow: 0 4px 15px rgba(10,37,64,0.3);
        }

        /* ===== COURSE CARDS GRID ===== */
        .courses-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 30px;
        }

        .course-card {
            background: #fff;
            border-radius: 20px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.06);
            border: 1px solid #f0f0f0;
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            cursor: pointer;
            position: relative;
            overflow: hidden;
            display: flex;
            flex-direction: column;
            text-decoration: none;
            color: inherit;
        }
        .course-card::after {
            content: '';
            position: absolute;
            bottom: 0; left: 0;
            width: 100%; height: 5px;
            background: linear-gradient(90deg, #00B4D8, #0A2540);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.4s ease;
        }
        .course-card:hover::after {
            transform: scaleX(1);
        }
        .course-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 20px 40px rgba(10,37,64,0.12);
            border-color: transparent;
            color: inherit;
        }
        .course-card.hidden {
            display: none !important;
        }

        .course-img-wrapper {
            width: 100%;
            height: 200px;
            overflow: hidden;
            position: relative;
            background: #f7f8fa;
        }
        .course-img-wrapper img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .course-card:hover .course-img-wrapper img {
            transform: scale(1.08);
        }
        .course-category-badge {
            position: absolute;
            top: 15px;
            right: 15px;
            background: rgba(10,37,64,0.9);
            color: #fff;
            padding: 5px 12px;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            backdrop-filter: blur(4px);
            z-index: 2;
        }

        .course-content {
            padding: 25px;
            display: flex;
            flex-direction: column;
            flex-grow: 1;
        }

        .course-icon-badge {
            width: 50px;
            height: 50px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            margin-top: -50px;
            margin-bottom: 15px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.1);
            position: relative;
            z-index: 3;
            background: #fff;
            border: 2px solid #fff;
        }
        /* Icon colors applied dynamically via JS */
        
        .course-title {
            font-family: 'Montserrat', sans-serif;
            font-weight: 700;
            font-size: 1.15rem;
            color: #0A2540;
            margin-bottom: 10px;
            line-height: 1.3;
        }
        .course-desc {
            color: #64748b;
            font-size: 0.9rem;
            line-height: 1.6;
            margin-bottom: 18px;
            flex-grow: 1;
        }

        .course-meta-row {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            margin-bottom: 20px;
        }
        .course-meta-tag {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            padding: 4px 10px;
            border-radius: 50px;
            background: #F7F8FA;
            color: #4a5568;
            font-size: 0.75rem;
            font-weight: 600;
            border: 1px solid #e2e8f0;
        }

        .course-cta {
            display: inline-flex;
            align-items: center;
            justify-content: space-between;
            color: #0A2540;
            font-weight: 700;
            font-size: 0.9rem;
            text-decoration: none;
            transition: all 0.3s;
            margin-top: auto;
            border-top: 1px solid #f0f0f0;
            padding-top: 15px;
        }
        .course-cta .icon-arrow {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: #F7F8FA;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #00B4D8;
            transition: all 0.3s;
        }
        .course-card:hover .course-cta {
            color: #00B4D8;
        }
        .course-card:hover .course-cta .icon-arrow {
            background: #00B4D8;
            color: #fff;
            transform: translateX(5px);
        }

        /* ===== CTA BANNER ===== */
        .cta-banner {
            background: #0A2540;
            padding: 60px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-banner::before {
            content: '';
            position: absolute;
            top: 0; left: 0; width: 100%; height: 100%;
            background: radial-gradient(circle at 50% 50%, rgba(0,180,216,0.1), transparent 60%);
        }
        .cta-banner * { position: relative; z-index: 2; }
        .cta-banner h2 { color: #fff; margin-bottom: 10px; }
        .cta-banner p { color: rgba(255,255,255,0.7); margin-bottom: 25px; }

        .btn-cta-wa {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 40px;
            background: #25D366;
            color: #fff;
            border-radius: 50px;
            font-weight: 700;
            text-decoration: none;
            font-size: 1.05rem;
            transition: all 0.3s;
            box-shadow: 0 4px 15px rgba(37,211,102,0.3);
        }
        .btn-cta-wa:hover {
            background: #128C7E;
            color: #fff;
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(37,211,102,0.4);
        }

        /* ===== ANIMATIONS ===== */
        .course-card {
            opacity: 0;
            transform: translateY(30px);
        }
        .course-card.show {
            opacity: 1;
            transform: translateY(0);
        }
        
        .icon-blue { color: #00B4D8; }
        .icon-gold { color: #F2A900; }
        .icon-purple { color: #7C3AED; }
        .icon-green { color: #10B981; }
        .icon-red { color: #EF4444; }
        .icon-indigo { color: #6366F1; }

        /* ===== RESPONSIVE MOBILE ===== */
        @media (max-width: 768px) {
            .page-header {
                padding: 120px 0 40px 0;
            }
            .page-header h1 {
                font-size: 1.8rem;
            }
            .page-header p {
                font-size: 0.95rem;
            }
            .filter-tabs {
                gap: 8px;
                margin-bottom: 25px;
            }
            .filter-tab {
                padding: 8px 16px;
                font-size: 0.8rem;
            }
            .courses-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .search-wrapper {
                margin-bottom: 25px;
            }
            .cta-banner {
                padding: 40px 20px;
                border-radius: 16px;
            }
            .cta-banner h3 {
                font-size: 1.3rem;
            }
        }

        @media (max-width: 576px) {
            .page-header {
                padding: 100px 0 30px 0;
            }
            .page-header h1 {
                font-size: 1.5rem;
            }
            .filter-tab {
                padding: 7px 14px;
                font-size: 0.75rem;
            }
        }