body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;max-width:720px;margin:48px auto;padding:0 20px;color:#222;line-height:1.7}
h1{font-size:28px;margin-bottom:4px} .sub{color:#666} .card{border:1px solid #ddd;border-radius:12px;padding:16px 20px;margin:20px 0} .ok{color:#0a7a42;font-weight:700} code{background:#f2f2f2;padding:2px 6px;border-radius:4px}

/* test v4: correct MIME on upload */