:root { --green: #02c98d; --green-dark: #027653; --ink: #0d1b17; --muted: #5f6f69; --line: #e6efec; --soft: #f4faf8; }
* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); background: #fff; font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button, a, input, select, textarea { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--green-dark); outline-offset: 4px; }
[hidden] { display: none !important; }
.wrap { width: min(1140px, 92%); margin: auto; }
header { border-bottom: 1px solid var(--line); background: #fff; }
.nav { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { color: #000; display: flex; align-items: center; gap: 10px; font-size: 21px; font-weight: 800; letter-spacing: .5px; }
.nav-link, .back { font-size: 14px; color: var(--muted); }
.nav-link:hover, .back:hover { color: var(--green-dark); text-decoration: underline; }
main { padding: 32px 0 64px; min-height: calc(100vh - 150px); }
.steps { display: flex; gap: 24px; list-style: none; padding: 0; margin: 0 0 36px; font-size: 14px; color: var(--muted); flex-wrap: wrap; }
.steps li { display: flex; align-items: center; gap: 8px; }
.steps li > span:first-child { flex-shrink: 0; display: inline-grid; place-items: center; width: 26px; height: 26px; border: 1px solid var(--line); border-radius: 50%; font-size: 13px; }
.steps [aria-current] { color: var(--green-dark); font-weight: 700; }
.steps [aria-current] > span:first-child { background: var(--green-dark); color: white; }
.product-grid { display: grid; grid-template-columns: 1.12fr 1fr; gap: 64px; align-items: center; }
.product-art { position: relative; background: radial-gradient(ellipse at center, #d9f4e9, var(--soft) 70%); border: 1px solid var(--line); border-radius: 24px; padding: 75px 16px; }
.product-art img { width: 100%; height: auto; display: block; mix-blend-mode: multiply; }
.product-art figcaption { text-align: center; color: var(--muted); font-size: 14px; margin-top: 32px; }
figure { margin: 0; }
.eyebrow { text-transform: uppercase; letter-spacing: 2px; color: var(--green-dark); font-size: 13px; font-weight: 700; }
h1 { font-size: clamp(30px, 4vw, 44px); letter-spacing: -1.2px; line-height: 1.15; margin: 12px 0 18px; }
h2 { font-size: 20px; letter-spacing: -.3px; margin: 0 0 20px; }
p { margin: 0 0 20px; }
.muted { color: var(--muted); }
.price { font-size: 32px; font-weight: 750; margin: 22px 0 2px; }
.small { font-size: 14px; }
.features { list-style: none; padding: 20px 0; margin: 0; border-top: 1px solid var(--line); }
.features li { margin: 10px 0; }
.features li::before { content: '✓'; color: var(--green-dark); font-weight: 800; margin-inline-end: 12px; }
.notice { background: var(--soft); border: 1px solid #cce9dd; border-radius: 12px; padding: 14px 18px; font-size: 14px; margin: 20px 0; }
.buy-controls { display: flex; gap: 14px; align-items: flex-end; }
label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; }
input, select, textarea { width: 100%; border: 1px solid #c5d5ce; background: #fff; color: var(--ink); padding: 12px; border-radius: 9px; min-height: 50px; }
textarea { resize: vertical; }
.quantity { width: 95px; flex-shrink: 0; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 0; border-radius: 999px; min-height: 50px; padding: 12px 24px; background: var(--green-dark); color: white; font-weight: 650; cursor: pointer; }
.btn:hover { background: #025e43; }
.btn:disabled { opacity: .65; cursor: wait; }
.buy-controls .btn { flex: 1; }
.full { width: 100%; }
.checkout-grid { display: grid; grid-template-columns: 1.35fr 1fr; gap: 40px; align-items: start; }
.panel { border: 1px solid var(--line); border-radius: 18px; padding: 28px; margin: 0 0 22px; }
fieldset { min-width: 0; }
legend { padding: 0 8px; font-size: 20px; font-weight: 700; }
.fields { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.wide { grid-column: 1 / -1; }
.payment-choice { display: flex; gap: 12px; align-items: flex-start; background: var(--soft); padding: 16px; border: 1px solid #cce9dd; border-radius: 12px; }
.payment-choice input { width: 18px; min-height: 18px; margin-top: 5px; accent-color: var(--green-dark); flex-shrink: 0; }
.payment-choice .muted { display: block; font-weight: 400; }
.summary { background: var(--soft); }
.summary-product { display: flex; align-items: center; gap: 16px; border-bottom: 1px solid var(--line); padding-bottom: 24px; margin-bottom: 24px; }
.summary-product img { width: 110px; height: 85px; object-fit: contain; mix-blend-mode: multiply; }
.summary-product p { margin: 0; }
dl { margin: 0; }
.line { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin: 12px 0; }
dd { margin: 0; font-weight: 600; text-align: end; }
.total { border-top: 1px solid #cdded5; padding-top: 18px; margin-top: 20px; font-size: 20px; font-weight: 750; }
.error { color: #9b2727; background: #fff2f2; border: 1px solid #efc3c3; border-radius: 10px; padding: 14px; margin-bottom: 16px; }
.success { max-width: 660px; margin: 30px auto; text-align: center; }
.success-mark { display: inline-grid; place-items: center; width: 70px; height: 70px; background: #e0f8ee; color: var(--green-dark); border-radius: 50%; font-size: 32px; }
.success dl { text-align: start; }
.success .back { display: block; margin-top: 18px; }
footer { border-top: 1px solid var(--line); padding: 22px 0; color: var(--muted); font-size: 14px; }
@media (max-width: 760px) { .product-grid, .checkout-grid { grid-template-columns: 1fr; gap: 28px; } .product-art { padding: 20px 12px; } .product-art img { max-height: 250px; object-fit: contain; } .product-art figcaption { margin-top: 10px; } .panel { padding: 20px; } .steps { gap: 16px; margin-bottom: 24px; } main { padding-top: 24px; } .checkout-grid aside { grid-row: 1; } }
@media (max-width: 420px) { .fields { grid-template-columns: 1fr; } .nav-link { max-width: 115px; text-align: right; } .buy-controls { gap: 10px; } .btn { padding-inline: 18px; } .summary-product img { width: 80px; } }

/* Accessories share the tracker’s studio artwork and purchase controls. */
.accessory-grid { margin-top: 64px; padding-top: 48px; border-top: 1px solid var(--line); }
.accessory-grid h2 { font-size: clamp(28px, 4vw, 40px); letter-spacing: -.035em; line-height: 1.15; margin: 12px 0 20px; }
.cart-bar { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 20px; margin-top: 40px; padding: 24px; border: 1px solid var(--line); border-radius: 18px; background: var(--soft); }
.cart-bar > div > span, .cart-bar strong { display: block; }
.cart-bar strong { font-size: 28px; margin: 4px 0; }
.cart-bar > p { flex-basis: 100%; margin: 0; }
@media (max-width: 760px) { .accessory-grid { margin-top: 40px; padding-top: 32px; } .cart-bar .btn { width: 100%; } }