body { background-color: #f4f7f6; font-family: 'Poppins', sans-serif; color: #333; margin: 0; }
.hidden { display: none; }

.checkout-header { background: white; padding: 20px 0; box-shadow: 0 2px 10px rgba(0,0,0,0.05); text-align: center; margin-bottom: 30px; }
.secure-badge { color: #2E7D32; font-size: 0.9rem; display: flex; align-items: center; justify-content: center; gap: 5px; margin-bottom: 5px; font-weight: 600; }
.logo-checkout { font-size: 1.5rem; font-weight: 700; color: #333; text-transform: uppercase; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.checkout-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 30px; align-items: start; }

.steps { display: flex; margin-bottom: 20px; gap: 10px; }
.step { flex: 1; padding: 10px; background: #e0e0e0; color: #888; text-align: center; border-radius: 5px; font-weight: 600; font-size: 0.9rem; }
.step.active { background: #2E7D32; color: white; }

.payment-box, .order-summary { background: white; border-radius: 10px; padding: 30px; box-shadow: 0 5px 20px rgba(0,0,0,0.05); }
.payment-box h3, .order-summary h3 { margin-bottom: 20px; font-size: 1.2rem; border-bottom: 1px solid #eee; padding-bottom: 10px; }

.form-group { margin-bottom: 15px; }
.form-row { display: flex; gap: 15px; }
label { display: block; font-size: 0.9rem; margin-bottom: 5px; font-weight: 600; color: #555; }
input { width: 100%; padding: 12px; border: 1px solid #ddd; border-radius: 5px; font-size: 1rem; transition: 0.3s; }
input:focus { border-color: #2E7D32; outline: none; }
input:disabled { background: #f9f9f9; color: #777; }

.error-msg { color: red; font-size: 0.8rem; display: none; margin-top: 5px; }

.btn-checkout-action { width: 100%; background: #2E7D32; color: white; padding: 15px; border: none; border-radius: 5px; font-size: 1.1rem; font-weight: 700; cursor: pointer; margin-top: 10px; transition: 0.3s; }
.btn-checkout-action:hover { background: #1b5e20; }

.header-split { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.link-btn { background: none; border: none; color: #2E7D32; text-decoration: underline; cursor: pointer; font-size: 0.9rem; }

.selected-product { display: flex; gap: 15px; margin-bottom: 20px; padding-bottom: 20px; border-bottom: 1px solid #eee; }
.selected-product img { width: 120px; height: 120px; object-fit: contain; border-radius: 5px; border: 1px solid #eee; }
.prod-details h4 { font-size: 1rem; margin-bottom: 5px; }
.prod-details p { font-size: 0.85rem; color: #777; }

.price-rows .row { display: flex; justify-content: space-between; margin-bottom: 10px; font-size: 0.95rem; }
.row.green { color: #2E7D32; font-weight: 600; }
.row.total { font-size: 1.3rem; font-weight: 700; margin-top: 15px; border-top: 1px solid #eee; padding-top: 15px; }

.guarantee-badge { background: #e8f5e9; padding: 15px; border-radius: 5px; margin-top: 20px; display: flex; align-items: center; gap: 10px; color: #2E7D32; font-size: 0.85rem; font-weight: 500; }

@media (max-width: 768px) {
    .checkout-grid { grid-template-columns: 1fr; }
    .summary-column { order: -1; }
    .form-row { flex-direction: column; gap: 10px; }
}

.kit-selector { margin-bottom: 20px; border-bottom: 1px solid #eee; padding-bottom: 15px; }
.kit-selector label { font-size: 0.85rem; color: #777; margin-bottom: 5px; display: block; }
.kit-selector select { width: 100%; padding: 10px; border: 1px solid #2E7D32; border-radius: 5px; font-weight: 600; color: #333; background: #fff; cursor: pointer; }
.kit-selector select:focus { outline: none; box-shadow: 0 0 0 2px rgba(46, 125, 50, 0.2); }

.checkout-footer { text-align: center; font-size: 0.85rem; color: #777; margin-top: 40px; padding-bottom: 20px; }