/* ── Page Layout ─────────────────────────────────────────────────── */
        :root {
            --cart-accent: #f97316;
            --cart-blue:   #1e4e8c;
            --cart-green:  #16a34a;
        }
        body { background: #f1f5f9; }

        .cart-page {
            min-height: 100vh;
            padding: 2.5rem 1rem 4rem;
        }
        .cart-inner {
            max-width: 1100px;
            margin: 0 auto;
        }
        .cart-heading {
            font-size: 1.8rem;
            font-weight: 700;
            color: #0f172a;
            margin-bottom: 1.8rem;
            display: flex;
            align-items: center;
            gap: .7rem;
        }
        .cart-heading i { color: var(--cart-accent); }

        /* ── Grid ────────────────────────────────────────────────────────── */
        .cart-grid {
            display: grid;
            grid-template-columns: 1fr 360px;
            gap: 1.8rem;
            align-items: start;
        }
        @media (max-width: 860px) {
            .cart-grid { grid-template-columns: 1fr; }
        }

        /* ── Item list ───────────────────────────────────────────────────── */
        .cart-items-card,
        .cart-summary-card,
        .cart-form-card {
            background: #fff;
            border-radius: 16px;
            box-shadow: 0 2px 16px rgba(0,0,0,.07);
            overflow: hidden;
        }
        .card-header {
            background: linear-gradient(135deg,#0d1f35,#1e4e8c);
            color: #fff;
            padding: 1rem 1.4rem;
            font-weight: 700;
            font-size: 1rem;
            display: flex;
            align-items: center;
            gap: .5rem;
        }

        #cart-items-list { padding: .5rem 0; }

        .cart-item {
            display: flex;
            align-items: center;
            gap: 1rem;
            padding: 1rem 1.4rem;
            border-bottom: 1px solid #f1f5f9;
            transition: background .15s;
        }
        .cart-item:last-child { border-bottom: none; }
        .cart-item:hover { background: #fafbff; }

        .cart-item-icon {
            width: 48px; height: 48px;
            border-radius: 12px;
            background: linear-gradient(135deg,#eef6ff,#e0ecff);
            display: flex; align-items: center; justify-content: center;
            color: var(--cart-blue); font-size: 1.3rem;
            flex-shrink: 0;
        }
        .cart-item-info { flex: 1; min-width: 0; }
        .cart-item-name {
            font-weight: 600;
            font-size: .95rem;
            color: #0f172a;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .cart-item-orig {
            font-size: .78rem;
            color: #94a3b8;
            text-decoration: line-through;
        }
        .cart-item-price {
            font-weight: 700;
            font-size: 1rem;
            color: var(--cart-green);
            white-space: nowrap;
        }
        .cart-item-remove {
            background: none;
            border: none;
            color: #ef4444;
            cursor: pointer;
            font-size: 1rem;
            padding: .3rem .5rem;
            border-radius: 8px;
            transition: background .15s;
        }
        .cart-item-remove:hover { background: #fee2e2; }

        /* ── Empty state ─────────────────────────────────────────────────── */
        #cart-empty {
            display: none;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 3rem 1.5rem;
            gap: 1rem;
            color: #64748b;
        }
        #cart-empty i { font-size: 3.5rem; color: #cbd5e1; }
        #cart-empty p { font-size: 1rem; margin: 0; text-align: center; }
        #cart-empty a {
            margin-top: .5rem;
            padding: .75rem 1.8rem;
            background: var(--cart-accent);
            color: #fff;
            border-radius: 999px;
            font-weight: 600;
            text-decoration: none;
            font-size: .9rem;
        }

        /* ── Summary card ────────────────────────────────────────────────── */
        .summary-body { padding: 1.2rem 1.4rem; }
        .summary-row {
            display: flex;
            justify-content: space-between;
            font-size: .92rem;
            padding: .4rem 0;
            color: #475569;
        }
        .summary-row.total {
            font-size: 1.1rem;
            font-weight: 700;
            color: #0f172a;
            border-top: 2px solid #f1f5f9;
            margin-top: .5rem;
            padding-top: .8rem;
        }
        .summary-row.savings { color: var(--cart-green); font-weight: 600; }
        .summary-row.gst {
            color: #64748b;
            font-size: .88rem;
            border-top: 1px dashed #e2e8f0;
            margin-top: .3rem;
            padding-top: .5rem;
        }
        .summary-row.subtotal { color: #334155; }

        .btn-checkout {
            width: 100%;
            margin-top: 1.2rem;
            padding: .95rem;
            background: linear-gradient(135deg,#f97316,#e8620a);
            color: #fff;
            border: none;
            border-radius: 12px;
            font-size: 1rem;
            font-weight: 700;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: .6rem;
            box-shadow: 0 4px 16px rgba(249,115,22,.4);
            transition: transform .15s, box-shadow .15s;
        }
        .btn-checkout:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(249,115,22,.5); }
        .btn-checkout:disabled { opacity: .6; cursor: not-allowed; }

        .secure-note {
            text-align: center;
            font-size: .75rem;
            color: #94a3b8;
            margin-top: .8rem;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: .35rem;
        }

        /* ── Checkout form ───────────────────────────────────────────────── */
        .form-body { padding: 1.4rem; }
        .form-group { margin-bottom: 1rem; }
        .form-group label {
            display: block;
            font-size: .83rem;
            font-weight: 600;
            color: #475569;
            margin-bottom: .35rem;
        }
        .form-group input {
            width: 100%;
            padding: .75rem 1rem;
            border: 1.5px solid #e2e8f0;
            border-radius: 10px;
            font-size: .92rem;
            transition: border-color .2s;
            box-sizing: border-box;
        }
        .form-group input:focus { outline: none; border-color: var(--cart-accent); }
        .form-group input.error { border-color: #ef4444; }

        /* ── Success overlay ─────────────────────────────────────────────── */
        #payment-success {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,.55);
            z-index: 9000;
            align-items: center;
            justify-content: center;
        }
        #payment-success.visible { display: flex; }
        .success-box {
            background: #fff;
            border-radius: 20px;
            padding: 2.5rem 2rem;
            max-width: 420px;
            width: 90%;
            text-align: center;
            animation: popIn .4s cubic-bezier(.34,1.56,.64,1);
        }
        @keyframes popIn {
            from { transform: scale(.7); opacity: 0; }
            to   { transform: scale(1);  opacity: 1; }
        }
        .success-icon {
            width: 72px; height: 72px;
            background: #dcfce7;
            border-radius: 50%;
            display: flex; align-items: center; justify-content: center;
            font-size: 2rem; color: var(--cart-green);
            margin: 0 auto 1.2rem;
        }
        .success-box h2 { font-size: 1.4rem; color: #0f172a; margin: 0 0 .5rem; }
        .success-box p  { color: #64748b; font-size: .9rem; margin: 0 0 1.5rem; }
        .success-box a {
            display: inline-block;
            padding: .75rem 2rem;
            background: var(--cart-green);
            color: #fff;
            border-radius: 999px;
            font-weight: 700;
            text-decoration: none;
            font-size: .92rem;
        }
        #success-payment-id { font-size: .78rem; color: #94a3b8; margin-top: .5rem; }

        /* ── Available Courses Catalog ───────────────────────────────────── */
        .courses-section {
            margin-top: 2.5rem;
        }
        .courses-section-header {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: .6rem;
            margin-bottom: 1.4rem;
        }
        .courses-section-title {
            font-size: 1.3rem;
            font-weight: 700;
            color: #0f172a;
            display: flex;
            align-items: center;
            gap: .5rem;
            margin: 0;
        }
        .courses-section-title i { color: var(--cart-accent); }
        .courses-section-sub { font-size: .85rem; color: #64748b; margin: 0; }

        .courses-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
            gap: 1.2rem;
        }

        .course-card {
            background: #fff;
            border-radius: 14px;
            box-shadow: 0 2px 12px rgba(0,0,0,.07);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            transition: transform .2s, box-shadow .2s;
            border: 2px solid transparent;
        }
        .course-card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(0,0,0,.12); }
        .course-card.in-cart { border-color: var(--cart-green); }

        .course-card-top {
            background: linear-gradient(135deg,#0d1f35,#1e4e8c);
            padding: 1.1rem 1.2rem .9rem;
        }
        .course-badge {
            display: inline-block;
            padding: .2rem .65rem;
            border-radius: 999px;
            font-size: .68rem;
            font-weight: 700;
            background: rgba(255,255,255,.2);
            color: #fff;
            margin-bottom: .65rem;
            text-transform: uppercase;
            letter-spacing: .04em;
        }
        .course-card-name {
            font-size: .95rem;
            font-weight: 700;
            color: #fff;
            line-height: 1.4;
        }
        .course-card-in-cart-badge {
            display: none;
            position: absolute;
            top: 10px; right: 10px;
            background: var(--cart-green);
            color: #fff;
            font-size: .68rem;
            font-weight: 700;
            padding: .2rem .55rem;
            border-radius: 999px;
        }
        .course-card-top { position: relative; }
        .course-card.in-cart .course-card-in-cart-badge { display: inline-block; }

        .course-card-body {
            padding: 1rem 1.2rem;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: .7rem;
        }
        .course-price-row {
            display: flex;
            align-items: baseline;
            gap: .5rem;
            flex-wrap: wrap;
        }
        .course-price {
            font-size: 1.22rem;
            font-weight: 800;
            color: var(--cart-green);
        }
        .course-orig-price {
            font-size: .82rem;
            color: #94a3b8;
            text-decoration: line-through;
        }
        .course-savings-badge {
            font-size: .7rem;
            font-weight: 700;
            background: #dcfce7;
            color: #15803d;
            padding: .15rem .45rem;
            border-radius: 6px;
        }
        .course-meta {
            display: flex;
            flex-wrap: wrap;
            gap: .35rem .8rem;
            font-size: .78rem;
            color: #64748b;
        }
        .course-meta span { display: flex; align-items: center; gap: .28rem; }
        .course-meta i { color: var(--cart-blue); font-size: .8rem; }

        .btn-add-course {
            margin-top: auto;
            width: 100%;
            padding: .75rem;
            border-radius: 10px;
            border: none;
            font-size: .88rem;
            font-weight: 700;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: .5rem;
            transition: background .15s, transform .15s, box-shadow .15s;
        }
        .btn-add-course.add {
            background: linear-gradient(135deg,#f97316,#e8620a);
            color: #fff;
            box-shadow: 0 3px 10px rgba(249,115,22,.3);
        }
        .btn-add-course.add:hover { transform: translateY(-1px); box-shadow: 0 6px 16px rgba(249,115,22,.4); }
        .btn-add-course.remove {
            background: #f8fafc;
            color: #ef4444;
            border: 1.5px solid #fecaca;
        }
        .btn-add-course.remove:hover { background: #fee2e2; }

        .btn-view-syllabus {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: .4rem;
            padding: .55rem;
            background: transparent;
            color: var(--cart-blue);
            border: 1.5px solid var(--cart-blue);
            border-radius: 10px;
            font-size: .82rem;
            font-weight: 600;
            text-decoration: none;
            transition: background .15s, color .15s;
            margin-top: .4rem;
        }
        .btn-view-syllabus:hover { background: var(--cart-blue); color: #fff; }

        .courses-loading, .courses-error {
            text-align: center;
            padding: 3rem 1.5rem;
            color: #94a3b8;
            font-size: .95rem;
            background: #fff;
            border-radius: 14px;
            box-shadow: 0 2px 12px rgba(0,0,0,.07);
        }
        .courses-error { color: #ef4444; }