* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
    background: #f5f7fb;
    color: #1f2937;
}
.container {
    width: 100%;
    max-width: 460px;
    margin: 48px auto;
    padding: 24px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 6px 20px rgba(31, 41, 55, 0.08);
}
h1 { margin: 0 0 16px; font-size: 24px; }
p.desc { margin: 0 0 20px; color: #6b7280; font-size: 14px; }
label { display: block; margin: 12px 0 6px; font-size: 14px; color: #374151; }
input, textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    font-size: 14px;
}
textarea { min-height: 92px; resize: vertical; }
button {
    width: 100%;
    margin-top: 16px;
    padding: 10px 12px;
    border: 0;
    border-radius: 8px;
    background: #2563eb;
    color: #fff;
    font-size: 14px;
    cursor: pointer;
}
button.secondary { background: #4b5563; }
.tips { margin-top: 12px; font-size: 13px; color: #6b7280; }
.msg {
    margin-top: 12px;
    padding: 10px 12px;
    border-radius: 8px;
    font-size: 13px;
}
.msg.ok { background: #ecfdf5; color: #065f46; }
.msg.err { background: #fef2f2; color: #991b1b; }
.row { display: flex; gap: 10px; align-items: center; }
.row > * { flex: 1; }
.qr-wrap {
    margin-top: 14px;
    padding: 14px;
    border: 1px solid #e5e7eb;
    border-radius: 8px;
    text-align: center;
    background: #fafafa;
}
#qrcode { display: inline-block; margin-top: 8px; }
a.link { color: #2563eb; text-decoration: none; }