:root { color-scheme: light dark; }
body { font-family: -apple-system, Helvetica, Arial, sans-serif; max-width: 640px; margin: 40px auto; padding: 0 16px; line-height: 1.5; }
h1 { font-size: 1.4rem; }
.step { color: #888; font-size: 0.85rem; margin-bottom: 8px; }
table { width: 100%; border-collapse: collapse; margin: 16px 0; }
td, th { text-align: left; padding: 8px 4px; border-bottom: 1px solid #ddd; }
.total-row td { font-weight: bold; border-top: 2px solid #333; }
button, input[type=submit] { padding: 10px 18px; font-size: 1rem; cursor: pointer; }
input[type=text], input[type=email], input[type=tel], input[type=number] { padding: 8px; font-size: 1rem; width: 100%; box-sizing: border-box; margin-bottom: 12px; }
label { display: block; font-weight: 600; margin-bottom: 4px; }
.error { color: #b00020; margin: 12px 0; }
.qty-form { display: inline; }
.card-field { border: 1px solid #ccc; border-radius: 4px; padding: 10px; margin-bottom: 12px; }