body { font-family: system-ui, sans-serif; max-width: 480px; margin: 40px auto; padding: 0 16px; color: #222; }
h1 { font-size: 1.4rem; }
.card { border: 1px solid #ddd; border-radius: 8px; padding: 16px; margin-bottom: 16px; }
input[type=email] { width: 100%; padding: 8px; box-sizing: border-box; margin-bottom: 8px; }
button { padding: 10px 16px; border: 0; border-radius: 6px; background: #635bff; color: #fff; cursor: pointer; }
button:disabled { background: #aaa; cursor: not-allowed; }
.msg { margin-top: 12px; white-space: pre-wrap; font-size: 0.9rem; }
.ok { color: #0a7b33; } .err { color: #c0392b; }
code { background: #f4f4f4; padding: 1px 4px; border-radius: 3px; }
.hidden { display: none; }
#payment-element { margin: 12px 0; }