:root {
            --mt-cyan: #11C5D9;
            --mt-cyan-strong: #0E96A6;
            --mt-text: #0F172A;
            --mt-text-muted: #475569;
            --mt-text-subtle: #64748B;
            --mt-text-faint: #94A3B8;
            --mt-border: rgba(15, 23, 42, 0.08);
            --mt-soft: #F8FAFC;
            --mt-green: #22c55e;
            --mt-red: #ef4444;
            --mt-ease: cubic-bezier(0.16, 1, 0.3, 1);
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body {
            font-family: 'DM Sans', 'Roboto', ui-sans-serif, system-ui, sans-serif;
            color: var(--mt-text);
            line-height: 1.5;
            min-height: 100vh;
            background: #EEF2F6;
            padding: 2rem 1rem 3rem;
        }
        .checkout-page {
            max-width: 1080px;
            margin: 0 auto;
        }
        .checkout-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 1rem;
            margin-bottom: 2rem;
            flex-wrap: wrap;
        }
        .checkout-brand img {
            height: 36px;
            width: auto;
            display: block;
        }
        .back-link {
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--mt-cyan-strong);
            text-decoration: none;
        }
        .back-link:hover { text-decoration: underline; }

        /* Page heading */
        .checkout-heading {
            margin: 0 0 2rem;
            text-align: center;
            font-size: clamp(1.5rem, 3vw, 1.875rem);
            font-weight: 700;
            letter-spacing: -0.02em;
            color: var(--mt-text);
            text-transform: lowercase;
        }

        /* Layout */
        .checkout-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
            align-items: start;
        }
        .card {
            background: #fff;
            border-radius: 14px;
            border: 1px solid var(--mt-border);
            box-shadow: 0 1px 3px rgba(15, 23, 42, 0.04);
            padding: 1.75rem;
        }
        .card__title {
            font-size: 1.125rem;
            font-weight: 700;
            color: var(--mt-text);
            margin-bottom: 0.25rem;
        }
        .card__badge {
            display: inline-block;
            margin-left: 0.5rem;
            padding: 0.15rem 0.45rem;
            border-radius: 4px;
            background: rgba(34, 197, 94, 0.12);
            color: #15803d;
            font-size: 0.65rem;
            font-weight: 700;
            letter-spacing: 0.03em;
            text-transform: uppercase;
            vertical-align: middle;
        }
        .subscribing-as {
            font-size: 0.875rem;
            color: var(--mt-text-subtle);
            margin-bottom: 1.25rem;
        }
        .subscribing-as strong { color: var(--mt-text); font-weight: 600; }

        .product-row {
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
            gap: 1rem;
            padding-bottom: 1rem;
            border-bottom: 1px solid var(--mt-border);
        }
        .product-name { font-weight: 700; font-size: 0.95rem; }
        .product-period { font-size: 0.8rem; color: var(--mt-text-subtle); margin-top: 0.15rem; }
        .product-pricing { text-align: right; flex-shrink: 0; }
        .price-compare {
            font-size: 0.85rem;
            color: var(--mt-text-faint);
            text-decoration: line-through;
            display: block;
        }
        .price-current { font-size: 1.1rem; font-weight: 700; }
        .price-equiv { font-size: 0.75rem; color: var(--mt-text-faint); margin-top: 0.1rem; }

        .breakdown { margin-top: 1rem; }
        .breakdown-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0.45rem 0;
            font-size: 0.875rem;
            color: var(--mt-text-muted);
        }
        .breakdown-row.is-discount { color: var(--mt-green); font-weight: 600; }
        .breakdown-total {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 0.75rem;
            padding-top: 1rem;
            border-top: 1px solid var(--mt-border);
            font-size: 1.125rem;
            font-weight: 700;
        }

        .promo-box {
            margin-top: 1.25rem;
            padding: 1rem;
            border-radius: 10px;
            background: var(--mt-soft);
            border: 1px solid var(--mt-border);
        }
        .promo-box__label {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--mt-text-muted);
            margin-bottom: 0.65rem;
        }
        .promo-box__row { display: flex; gap: 0.5rem; }
        .promo-box input {
            flex: 1;
            padding: 0.55rem 0.75rem;
            border: 1px solid #E2E8F0;
            border-radius: 8px;
            font-size: 0.85rem;
            font-family: inherit;
            text-transform: uppercase;
            letter-spacing: 0.04em;
        }
        .promo-box button {
            padding: 0.55rem 1rem;
            border: 1px solid #E2E8F0;
            border-radius: 8px;
            background: #fff;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--mt-text-muted);
            cursor: pointer;
            font-family: inherit;
        }

        .included { margin-top: 1.5rem; }
        .included h3 {
            font-size: 0.7rem;
            font-weight: 700;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--mt-text-faint);
            margin-bottom: 0.75rem;
        }
        .included ul { list-style: none; }
        .included li {
            display: flex;
            align-items: flex-start;
            gap: 0.5rem;
            font-size: 0.875rem;
            color: var(--mt-text-muted);
            padding: 0.3rem 0;
        }
        .included li i {
            color: var(--mt-green);
            font-size: 0.95rem;
            margin-top: 0.1rem;
            flex-shrink: 0;
        }
        .secure-note {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            margin-top: 1.5rem;
            font-size: 0.8rem;
            color: var(--mt-text-subtle);
        }

        /* Right column — form */
        .form-title {
            font-size: 1.125rem;
            font-weight: 700;
            margin-bottom: 1.25rem;
        }
        .form-group { margin-bottom: 1.1rem; }
        .form-group label {
            display: block;
            font-size: 0.875rem;
            font-weight: 600;
            margin-bottom: 0.4rem;
            color: var(--mt-text);
        }
        .input-wrap {
            position: relative;
        }
        .input-wrap i {
            position: absolute;
            left: 0.85rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--mt-text-faint);
            font-size: 1rem;
            pointer-events: none;
        }
        .input-wrap input {
            width: 100%;
            padding: 0.7rem 0.85rem 0.7rem 2.5rem;
            border: 1px solid #E2E8F0;
            border-radius: 10px;
            font-size: 0.95rem;
            font-family: inherit;
            color: var(--mt-text);
            background: #fff;
            transition: border-color 150ms var(--mt-ease), box-shadow 150ms var(--mt-ease);
        }
        .input-wrap input:focus {
            outline: none;
            border-color: var(--mt-cyan);
            box-shadow: 0 0 0 3px rgba(17, 197, 217, 0.18);
        }
        .field-hint {
            font-size: 0.78rem;
            color: var(--mt-text-faint);
            margin-top: 0.35rem;
        }
        .btn-pay {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            width: 100%;
            margin-top: 0.5rem;
            padding: 0.85rem 1.25rem;
            border: none;
            border-radius: 10px;
            font-size: 1rem;
            font-weight: 600;
            font-family: inherit;
            color: #fff;
            background: var(--mt-cyan);
            cursor: pointer;
            transition: background 150ms var(--mt-ease), transform 150ms var(--mt-ease);
        }
        .btn-pay:hover:not(:disabled) { background: var(--mt-cyan-strong); }
        .btn-pay:disabled { opacity: 0.65; cursor: not-allowed; }
        .demo-note {
            margin-top: 1.25rem;
            font-size: 0.85rem;
            color: var(--mt-text-subtle);
            line-height: 1.55;
        }
        .demo-note a {
            color: var(--mt-cyan-strong);
            font-weight: 600;
            text-decoration: none;
        }
        .demo-note a:hover { text-decoration: underline; }

        .alert {
            padding: 0.75rem 1rem;
            border-radius: 8px;
            margin-bottom: 1rem;
            font-size: 0.875rem;
            display: none;
            background: #fef2f2;
            color: var(--mt-red);
        }
        .alert.show { display: block; }

        .checkout-footer {
            text-align: center;
            margin-top: 2.5rem;
            font-size: 0.875rem;
            color: var(--mt-text-subtle);
        }
        .checkout-footer a {
            color: var(--mt-cyan-strong);
            font-weight: 600;
            text-decoration: none;
        }
        .checkout-footer a:hover { text-decoration: underline; }

        @media (max-width: 860px) {
            .checkout-grid { grid-template-columns: 1fr; }
        }

/* ── Thank you page ── */
:root {
            --mt-cyan: #11C5D9;
            --mt-cyan-strong: #0E96A6;
            --mt-text: #0F172A;
            --mt-text-muted: #475569;
            --mt-border: rgba(15, 23, 42, 0.08);
            --mt-ease: cubic-bezier(0.16, 1, 0.3, 1);
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body {
            font-family: 'DM Sans', 'Roboto', ui-sans-serif, system-ui, sans-serif;
            color: var(--mt-text);
            line-height: 1.5;
            min-height: 100vh;
            background: #EEF2F6;
            padding: 2rem 1rem 3rem;
        }
        .ty-page { max-width: 560px; margin: 0 auto; }
        .ty-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 2rem;
        }
        .ty-brand img { height: 36px; width: auto; display: block; }
        .ty-card {
            background: #fff;
            border: 1px solid var(--mt-border);
            border-radius: 16px;
            padding: 2.5rem 1.75rem 2rem;
            box-shadow: 0 10px 30px -18px rgba(15, 23, 42, 0.25);
            text-align: center;
        }
        .ty-icon {
            width: 72px;
            height: 72px;
            margin: 0 auto 1.35rem;
            border-radius: 999px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(34, 197, 94, 0.12);
            color: #16a34a;
            font-size: 2rem;
        }
        .ty-card h1 {
            font-size: clamp(1.5rem, 3vw, 1.85rem);
            font-weight: 700;
            letter-spacing: -0.02em;
            margin-bottom: 1.25rem;
        }
        .ty-message {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 0.85rem;
            margin: 0 auto;
            max-width: 26rem;
            padding: 1.25rem 1.35rem;
            border-radius: 14px;
            background: linear-gradient(180deg, rgba(17, 197, 217, 0.08), rgba(17, 197, 217, 0.03));
            border: 1px solid rgba(17, 197, 217, 0.18);
        }
        .ty-message-icon {
            width: 40px;
            height: 40px;
            border-radius: 999px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: rgba(17, 197, 217, 0.14);
            color: var(--mt-cyan-strong);
            font-size: 1.15rem;
        }
        .ty-message p {
            margin: 0;
            font-size: 1.05rem;
            font-weight: 500;
            line-height: 1.55;
            letter-spacing: -0.015em;
            color: var(--mt-text-muted);
        }
        .ty-message strong {
            color: var(--mt-text);
            font-weight: 650;
        }