body { font-family: -apple-system, "Hiragino Sans", sans-serif; max-width: 480px; margin: 40px auto; padding: 0 16px; line-height: 1.6; color: #222; }
h1 { font-size: 20px; }
input, button, a.button { display: block; width: 100%; box-sizing: border-box; font-size: 16px; padding: 12px; margin: 8px 0; border-radius: 8px; }
input { border: 1px solid #bbb; }
button, a.button { border: none; background: #2f7d32; color: #fff; text-align: center; text-decoration: none; }
button.secondary, a.button.secondary { background: #e8e8e8; color: #222; }
code { word-break: break-all; }
.message { color: #555; font-size: 14px; }
.error { color: #b00020; font-size: 14px; }
[hidden] { display: none !important; }