body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Apple SD Gothic Neo,Noto Sans KR,sans-serif;background:#fff;color:#111}.phone-bg{background:#fff;min-height:100vh}.cert-card{background:#f3f6ff;border-radius:16px;padding:16px}.manage-btn{border-radius:6px;padding:8px 12px;background:#e9ecf7}.manage-btn:active{background:#dfe4f5}.bottom-btn{background:#e9ecf7;border-radius:10px;padding:12px}